U.S. patent application number 09/987240 was filed with the patent office on 2003-01-02 for network-linked laser target firearm training system.
Invention is credited to Rosa, Stephen P., Shechter, Motti.
Application Number | 20030003424 09/987240 |
Document ID | / |
Family ID | 22007477 |
Filed Date | 2003-01-02 |
United States Patent
Application |
20030003424 |
Kind Code |
A1 |
Shechter, Motti ; et
al. |
January 2, 2003 |
Network-linked laser target firearm training system
Abstract
A firearm training system includes a training firearm (40) which
includes a laser transmitter module (22) that emits a laser signal
along a longitudinal centerline of the barrel (10) of the firearm
in response to a mechanical wave generated from pulling the trigger
of the firearm. A laser-detecting target (42) includes a planar
array of laser light detectors capable of detecting the exact
location that the laser signal hits the target. The laser signal
transmitted by the training firearm (40) is preferably a modulated
laser pulse that the target (42) can easily discriminate from noise
and interference. The target is connected to a computer (44) which
reports laser hit information and keeps track of a sequence of
laser hits fired by a competitor or trainee. Computer (44) can be
linked via a communications network to similar firearm training
systems to enable competition between shooters at different
geographic locations.
Inventors: |
Shechter, Motti; (Potomac,
MD) ; Rosa, Stephen P.; (Ellicott City, MD) |
Correspondence
Address: |
EPSTEIN, EDELL, SHAPIRO, FINNAN & LYTLE, LLC
Suite 400
1901 Research Boulevard
Rockville
MD
20850-3164
US
|
Family ID: |
22007477 |
Appl. No.: |
09/987240 |
Filed: |
November 14, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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09987240 |
Nov 14, 2001 |
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09486342 |
Feb 25, 2000 |
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6322365 |
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09486342 |
Feb 25, 2000 |
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PCT/US98/17419 |
Aug 25, 1998 |
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60056937 |
Aug 25, 1997 |
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Current U.S.
Class: |
434/21 |
Current CPC
Class: |
F41A 33/02 20130101;
F41J 5/02 20130101; F41G 3/2655 20130101 |
Class at
Publication: |
434/21 |
International
Class: |
F41G 003/26 |
Claims
What is Claimed is:
1. A detachable training barrel that replaces a conventional
detachable barrel of a firearm to convert the firearm into a
training device that emits a laser signal upon firing a blank
cartridge, the training barrel comprising: a barrel-shaped member
defining a substantially cylindrical bore of the training barrel,
with a proximal end and a distal end; a solid wall extending
transversely across the bore of the training barrel and separating
the bore into a first substantially cylindrical cavity extending
inward from the proximal end and a second substantially cylindrical
cavity extending inward from the distal end, said first cavity
serving as a firing chamber and being adapted to receive the blank
cartridge, said wall preventing forward discharge toward the distal
end upon firing of the blank cartridge; and a removable laser
module extending into said second cavity, said laser module
emitting the laser signal in response to a mechanical wave sensed
from the firing of the blank cartridge in said first cavity.
2. The training barrel of claim 1, wherein said removable laser
module is substantially cylindrical and is concentric with said
barrel-shaped member, such that said removable laser module emits
the laser signal along a longitudinal centerline of the training
barrel.
3. The training barrel of claim 1, wherein replacement of the
conventional barrel with the training barrel, inclusive of said
removable laser module, does not substantially affect holstering of
the firearm.
4. The training barrel of claim 1, wherein said removable laser
module lies substantially within said second cavity and protrudes
from the distal end of said barrel-shaped member by no more than 1
cm in a longitudinal direction.
5. The training barrel of claim 1, wherein said removable laser
module has a threaded outer surface and said second cavity has a
threaded interior surface adapted to receive the threaded outer
surface of said removable laser module.
6. The training barrel of claim 1, wherein said removable laser
module does not protrude from the distal end of said barrel-shaped
member.
7. The training barrel of claim 1, wherein the training barrel
replaces a barrel of a pistol.
8. The training barrel of claim 1, wherein the training barrel is
coupled with an upper receiver, said training barrel and said upper
receiver replacing a barrel and upper receiver of a rifle.
9. The training barrel of claim 1, wherein said first cavity is
sized to prevent chambering of a conventional blank cartridge or of
a live round.
10. The training barrel of claim 1, wherein the training barrel and
the blank cartridge are color coded to prevent mismatching of
cartridges with said training barrel.
11. The training barrel of claim 1, further comprising: an
ultrasonic transmitter adapted to emit an ultrasonic acoustic
signal simultaneously with the laser signal.
12. The training barrel of claim 1, wherein: in an operational
mode, said removable laser module emits a laser pulse in response
to the mechanical wave sensed from the firing of the blank
cartridge in said first cavity; and in a boresighting mode, said
removable laser module emits a continuous laser beam to permit a
direction of emission of said removable laser module to be
boresighted with a longitudinal centerline of the firearm.
13. The training barrel of claim 1, wherein the laser signal is a
modulated laser pulse, and wherein said training barrel corresponds
to a target adapted to detect the modulated laser pulse.
14. The training barrel of claim 1, wherein the firearm fires the
blank cartridge using one of: powder, compressed air, and carbon
dioxide.
15. The training barrel of claim 1, wherein said removable laser
module is held in said second cavity by frictional force between an
outer surface of said removable laser module and an interior
surface of said second cavity.
16. A detachable training barrel that replaces a conventional
detachable barrel of a firearm to convert the firearm into a
training device that emits a laser signal upon firing a blank
cartridge, the training barrel comprising: a barrel-shaped member
defining a substantially cylindrical bore of the training barrel,
with a proximal end and a distal end; a solid wall extending
transversely across the bore of the training barrel and separating
the bore into a first substantially cylindrical cavity extending
inward from the proximal end and a second substantially cylindrical
cavity extending inward from the distal end, said first cavity
serving as a firing chamber and being adapted to receive the blank
cartridge, said wall preventing forward discharge toward the distal
end upon firing of the blank cartridge; and a laser module
extending into said second cavity and comprising: a substantially
cylindrical housing insertable into said second cavity; a
mechanical wave sensor disposed within said housing and adapted to
produce a trigger signal in response to a mechanical wave produced
by firing the blank cartridge in said first cavity; a laser
transmitter adapted to emit the laser signal in response to the
trigger signal; and a power source supplying power to said
mechanical wave sensor and said laser transmitter.
17. The training barrel of claim 16, wherein said laser module is
substantially cylindrical and is concentric with said barrel-shaped
member, such that said laser module emits the laser signal along a
longitudinal centerline of the training barrel.
18. The training barrel of claim 16, wherein replacement of the
conventional barrel with the training barrel, inclusive of said
laser module, does not substantially affect holstering of the
firearm.
19. The training barrel of claim 16, wherein said laser module lies
substantially within said second cavity and protrudes from the
distal end of said barrel-shaped member by no more than 1 cm in a
longitudinal direction.
20. The training barrel of claim 16, wherein said laser module is
removable from said second cavity.
21. The training barrel of claim 20, wherein said laser module has
a threaded outer surface and said second cavity has a threaded
interior surface adapted to receive the threaded outer surface of
said laser module.
22. The training barrel of claim 16, wherein said laser module in
permanently mounted within said second cavity.
23. The training barrel of claim 22, wherein said laser module does
not protrude from the distal end of said barrel-shaped member.
24. The training barrel of claim 16, wherein the training barrel
replaces a barrel of a pistol.
25. The training barrel of claim 16, wherein the training barrel is
coupled with an upper receiver, said training barrel and said upper
receiver replacing a barrel and upper receiver of a rifle.
26. The training barrel of claim 16, wherein: said mechanical wave
sensor includes at least one of: a piezoelectric element, an
accelerometer, and a strain gauge; said laser transmitter includes
a lens and an optics package that projects the laser signal
distally through the lens; and said power source comprises a
button-shaped battery.
27. The training barrel of claim 16, wherein said first cavity is
sized to prevent chambering of a conventional blank cartridge or of
a live round.
28. The training barrel of claim 16, wherein the training barrel
and the blank cartridge are color coded to prevent mismatching of
cartridges with said training barrel.
29. The training barrel of claim 16, further comprising: an
ultrasonic transmitter adapted to emit an ultrasonic acoustic
signal simultaneously with the laser signal.
30. The training barrel of claim 16, wherein: in an operational
mode, said laser module emits a laser pulse in response to the
mechanical wave sensed from the firing of the blank cartridge in
said first cavity; and in a boresighting mode, said laser module
emits a continuous laser beam to permit a direction of emission of
the laser module to be boresighted with a longitudinal centerline
of the firearm.
31. The training barrel of claim 16, wherein the laser signal is a
modulated laser pulse, and wherein said training barrel corresponds
to a target adapted to detect the modulated laser pulse.
32. The training barrel of claim 16, wherein the firearm fires the
blank cartridge using one of: powder, compressed air, and carbon
dioxide.
33. A detachable training barrel that replaces a conventional
detachable barrel of a firearm to convert the firearm into a
training device that emits a laser signal upon firing a blank
cartridge, the training barrel comprising: a barrel-shaped member
defining a substantially cylindrical bore of the training barrel,
with a proximal end and a distal end; a solid wall extending
transversely across the bore of the training barrel and separating
the bore into a first substantially cylindrical cavity extending
inward from the proximal end and a second substantially cylindrical
cavity extending inward from the distal end, said first cavity
serving as a firing chamber and being adapted to receive the blank
cartridge, said first cavity being sized to prevent chambering of a
live round, said wall preventing forward discharge toward the
distal end upon firing of the blank cartridge; and a laser module
extending into said second cavity, said laser module emitting the
laser signal in response to a mechanical wave sensed from the
firing of the blank cartridge in said first cavity.
34. A detachable training barrel that replaces a conventional
detachable barrel of a firearm to convert the firearm into a
training device that emits a laser signal upon firing a blank
cartridge, the training barrel comprising: a barrel-shaped member
defining a substantially cylindrical bore of the training barrel,
with a proximal end and a distal end; a solid wall extending
transversely across the bore of the training barrel and separating
the bore into a first substantially cylindrical cavity extending
inward from the proximal end and a second substantially cylindrical
cavity extending inward from the distal end, said first cavit
serving as a firing chamber and being adapted to receive the blank
cartridge, said wall preventing forward discharge toward the distal
end upon firing of the blank cartridge; and a laser module
extending into said second cavity, said laser module emitting the
laser signal in response to a mechanical wave sensed from the
firing of the blank cartridge in said first cavity; wherein the
training barrel and the blank cartridge are color coded to prevent
mismatching of cartridges with said training barrel.
35. A detachable training barrel that replaces a conventional
detachable barrel of a firearm to convert the firearm into a
training device that emits a laser signal upon firing a blank
cartridge, the training barrel comprising: a barrel-shaped member
defining a substantially cylindrical bore of the training barrel,
with a proximal end and a distal end; a solid wall extending
transversely across the bore of the training barrel and separating
the bore into a first substantially cylindrical cavity extending
inward from the proximal end and a second substantially cylindrical
cavity extending inward from the distal end, said first cavity
serving as a firing chamber and being adapted to receive the blank
cartridge, said wall preventing forward discharge toward the distal
end upon firing of the blank cartridge; a laser module extending
into said second cavity, said laser module emitting the laser
signal in response to a mechanical wave sensed from the firing of
the blank cartridge in said first cavity; and an ultrasonic
transmitter adapted to emit an ultrasonic acoustic signal
simultaneously with the laser signal.
36. A detachable training barrel that replaces a conventional
detachable barrel of a firearm to convert the firearm into a
training device that emits a laser signal upon firing a blank
cartridge, the training barrel comprising: a barrel-shaped member
defining a substantially cylindrical bore of the training barrel,
with a proximal end and a distal end; a solid wall extending
transversely across the bore of the training barrel and separating
the bore into a first substantially cylindrical cavity extending
inward from the proximal end and a second substantially cylindrical
cavity extending inward from the distal end, said first cavity
serving as a firing chamber and being adapted to receive the blank
cartridge, said wall preventing forward discharge toward the distal
end upon firing of the blank cartridge; and a laser module
extending into said second cavity, said laser module emitting the
laser signal in response to a mechanical wave sensed from the
firing of the blank cartridge in said first cavity, wherein; in an
operational mode, said laser module emits a laser pulse in response
to the mechanical wave sensed from the firing of the blank
cartridge in said first cavity; and in a boresighting mode, said
laser module emits a continuous laser beam to permit a direction of
emission of the laser module to be boresighted with a longitudinal
centerline of the firearm.
37. A training firearm that fires a blank cartridge and emits a
laser signal upon firing of the blank cartridge, said training
firearm comprising: a pullable trigger for initiating firing of the
blank cartridge; a training barrel having a substantially
cylindrical bore with a proximal end and a distal end; a solid wall
extending transversely across the bore of said training barrel and
separating the bore into a first substantially cylindrical cavity
extending inward from the proximal end and a second substantially
cylindrical cavity extending inward from the distal end, said first
cavity serving as a firing chamber and being adapted to receive the
blank cartridge, said wall preventing forward discharge toward the
distal end upon firing of the blank cartridge; and a removable
laser module extending into said second cavity, said removable
laser module emitting the laser signal in response to a mechanical
wave sensed from the firing of the blank cartridge in said first
cavity.
38. The training firearm of claim 37, wherein: said training barrel
is detachable from said training firearm; and said training firearm
accommodates a conventional barrel permitting the training firearm
to fire projectiles.
39. The training firearm of claim 37, wherein holstering of the
training firearm with said training barrel is substantially the
same as holstering of the training firearm with said conventional
barrel.
40. The training firearm of claim 37, wherein said removable laser
module is substantially cylindrical and is concentric with said
training barrel, such that said laser module emits the laser signal
along a longitudinal centerline of said training barrel.
41. The training firearm of claim 37, wherein said removable laser
module lies substantially within said second cavity and protrudes
from the distal end of said barrelshaped member by no more than 1
cm in a longitudinal direction.
42. The training firearm of claim 37, wherein said removable laser
module has a threaded outer surface and said second cavity has a
threaded interior surface adapted to receive the threaded outer
surface of said removable laser module.
43. The training firearm of claim 37, wherein said removable laser
module does not protrude from the distal end of said barrel-shaped
member.
44. The training firearm of claim 37, wherein said removable laser
module comprises: a substantially cylindrical housing insertable
into said second cavity; a mechanical wave sensor disposed within
said housing and adapted to produce a trigger signal in response to
the mechanical wave produced by firing the blank cartridge in said
first cavity; a laser transmitter adapted to emit the laser signal
in response to the trigger signal; and a power source supplying
power to said mechanical wave sensor and said laser
transmitter.
45. The training firearm of claim 37, wherein said first cavity is
sized to prevent chambering of a conventional blank cartridge or of
a live round.
46. The training firearm of claim 37, wherein the training firearm
and the blank cartridge are color coded to prevent mismatching of
cartridges with said training barrel.
47. The training firearm of claim 37, further comprising: an
ultrasonic transmitter adapted to emit an ultrasonic acoustic
signal simultaneously with the laser signal.
48. The training firearm of claim 37, wherein the laser signal is a
modulated laser pulse, and wherein said training firearm
corresponds to a target adapted to detect the modulated laser
pulse.
49. The training firearm of claim 37, wherein the training firearm
fires the blank cartridge using one of: powder, compressed air, and
carbon dioxide.
50. The training firearm of claim 37, wherein said removable laser
module is held in said second cavity by frictional force between an
outer surface of said removable laser module and an interior
surface of said second cavity.
51. A training firearm that fires a blank cartridge and emits a
laser signal upon firing of the blank cartridge, said training
firearm comprising: a pullable trigger for initiating firing of the
blank cartridge; a training barrel having a substantially
cylindrical bore with a proximal end and a distal end; a solid wall
extending transversely across the bore of said training barrel and
separating the bore into a first substantially cylindrical cavity
extending inward from the proximal end and a second substantially
cylindrical cavity extending inward from the distal end, said first
cavity serving as a firing chamber and being adapted to receive the
blank cartridge, said first cavity being sized to prevent
chambering of a live round, said wall preventing forward discharge
toward the distal end upon firing of the blank cartridge; and a
laser module extending into said second cavity, said laser module
emitting the laser signal in response to a mechanical wave sensed
from the firing of the blank cartridge in said first cavity.
52. A training firearm that fires a blank cartridge and emits a
laser signal upon firing of the blank cartridge, said training
firearm comprising: a pullable trigger for initiating firing of the
blank cartridge; a training barrel having a substantially
cylindrical bore with a proximal end and a distal end; a solid wall
extending transversely across the bore of said training barrel and
separating the bore into a first substantially cylindrical cavity
extending inward from the proximal end and a second substantially
cylindrical cavity extending inward from the distal end, said first
cavity serving as a firing chamber and being adapted to receive the
blank cartridge, said wall preventing forward discharge toward the
distal end upon firing of the blank cartridge; and a laser module
extending into said second cavity, said laser module emitting the
laser signal in response to a mechanical wave sensed from the
firing of the blank cartridge in said first cavity; wherein the
training firearm and the blank cartridge are color coded to prevent
mismatching of cartridges with said training barrel.
53. A training firearm that fires a blank cartridge and emits a
laser signal upon firing of the blank cartridge, said training
firearm comprising: a pullable trigger for initiating firing of the
blank cartridge; a training barrel having a substantially
cylindrical bore with a proximal end and a distal end; a solid wall
extending transversely across the bore of said training barrel and
separating the bore into a first substantially cylindrical cavity
extending inward from the proximal end and a second substantially
cylindrical cavity extending inward from the distal end, said first
cavity serving as a firing chamber and being adapted to receive the
blank cartridge, said wall preventing forward discharge toward the
distal end upon firing of the blank cartridge; a laser module
extending into said second cavity, said laser module emitting the
laser signal in response to a mechanical wave sensed from the
firing of the blank cartridge in said first cavity; and an
ultrasonic transmitter adapted to emit an ultrasonic acoustic
signal simultaneously with the laser signal.
54. A training firearm that fires a blank cartridge and emits a
laser signal upon firing of the blank cartridge, said training
firearm comprising: a pullable trigger for initiating firing of the
blank cartridge; a training barrel having a substantially
cylindrical bore with a proximal end and a distal end; a solid wall
extending transversely across the bore of said training barrel and
separating the bore into a first substantially cylindrical cavity
extending inward from the proximal end and a second substantially
cylindrical cavity extending inward from the distal end, said first
cavity serving as a firing chamber and being adapted to receive the
blank cartridge, said wall preventing forward discharge toward the
distal end upon firing of the blank cartridge; and a laser module
extending into said second cavity and comprising: a substantially
cylindrical housing insertable into said second cavity; a
mechanical wave sensor disposed within said housing and adapted tot
produce a trigger signal in response to a mechanical wave produced
by firing the blank cartridge in said first cavity; a laser
transmitter adapted to emit the laser signal in response to the
trigger signal; and a power source supplying power to said
mechanical wave sensor and said laser transmitter.
55. A training firearm that fires a blank cartridge and emits a
laser signal upon firing of the blank cartridge, said training
firearm comprising: a pullable trigger for initiating firing of the
blank cartridge; a training barrel having a substantially
cylindrical bore with a proximal end and a distal end; a solid wall
extending transversely across the bore of said training barrel and
separating the bore into a first substantially cylindrical cavity
extending inward from the proximal end and a second substantially
cylindrical cavity extending inward from the distal end, said first
cavity serving as a firing chamber and being adapted to receive the
blank cartridge, said wall preventing forward discharge toward the
distal end upon firing of the blank cartridge; and a laser module
extending into said second cavity, said laser module emitting the
laser signal in response to a mechanical wave sensed from the
firing of the blank cartridge in said first cavity, wherein; in an
operational mode, said laser module emits a laser pulse in response
to the mechanical wave sensed from the firing of the blank
cartridge in said first cavity; and in a boresighting mode, said
laser module emits a continuous laser beam to permit a direction of
emission of the laser module to be boresighted with a longitudinal
centerline of the firearm.
56. A laser firearm system for firearm competition or training
involving firing a firearm toward a target without use of
projectiles, the system comprising: a training firearm having a
trigger, a barrel and a laser transmitter module that emits a laser
signal in response to a mechanical wave produced by pulling of the
trigger and sensed by the laser transmitter module; a
laser-detecting target adapted to detect the laser signal and
produce a laser detection signal; a processor responsive to the
laser detection signal for generating information indicating a hit
location of the laser signal on said target; a remotely-located
laser-detecting target and processor; and a communication network
linking said processor to said remotely-located processor.
57. The system of claim 56, wherein said laser-detecting target
includes an array of laser light detectors adapted to detect the
laser signal and to produce the laser detection signal.
58. The system of claim 56, wherein said laser transmitter module
emits a modulated laser signal along a longitudinal centerline of
the barrel in response to the mechanical wave produced by pulling
of the trigger and sensed by said laser-detecting target.
59. The system of claim 58, wherein said laser-detecting target is
configured to detect only laser signals modulated in the manner of
said modulated laser signal.
60. The system of claim 58, wherein a modulation of the modulated
laser signal identifies the training firearm emitting the modulated
laser signal.
61. The system of claim 56, wherein pulling of the trigger causes
firing of a blank cartridge that produces the mechanical wave.
62. The system of claim 56, wherein said training firearm
comprises: a conventional firearm; and a cylindrical laser module
inserted into a barrel of the conventional firearm.
63. The system of claim 56, wherein said training firearm comprises
a training barrel incapable of firing a projectile.
64. The system of claim 63, wherein said training barrel is a
detachable training barrel that replaces a conventional detachable
barrel of a firearm to convert the firearm into a training device
that emits a laser signal upon firing a blank cartridge.
65. The system of claim 64, wherein said training barrel comprises:
a barrel-shaped member defining a substantially cylindrical bore of
the training barrel, with a proximal end and a distal end; and a
solid wall extending transversely across the bore of the training
barrel and separating the bore into a first substantially
cylindrical cavity extending inward from the proximal end and a
second substantially cylindrical cavity extending inward from the
distal end, said first cavity serving as a firing chamber and being
adapted to receive the blank cartridge, said wall preventing
forward discharge toward the distal end upon firing of the blank
cartridge, the laser transmitter module extending into said second
cavity and emitting the laser signal in response to the mechanical
wave sensed from the firing of the blank cartridge in said first
cavity.
66. The system of claim 56, wherein said training firearm is
incapable of firing a projectile.
67. The system of claim 56, wherein said laser-detecting target is
formed in the shape of a bull's eye.
68. The system of claim 56, wherein said laser-detecting target
comprises a plurality of range-scaled targets.
69. The system of claim 56, further comprising: an ultrasonic
transmitter coupled to said training firearm and adapted to
transmit an ultrasonic signal simultaneously with the laser signal;
an ultrasonic detector coupled to said laser-detecting target and
adapted to detect an arrival time of the ultrasonic signal at said
laser-detecting target; wherein said processor determines a
distance between said training firearm and said laser-detecting
target from a time delay between an arrival time of the laser
signal at said laser-detecting target and the arrival time of the
ultrasonic signal.
70. The system of claim 56, wherein said processor determines a
center of gravity of a group of laser signals sequentially detected
by the laser-detecting target.
71. The system of claim 56, wherein said communication network
includes a server linked to said first and second processors.
72. The system of claim 56, wherein: said training firearm, said
laser-detecting target and said processor are located at a first
site, and said remotely-located laser-detecting target and
processor are located at a second site; and said communication
network includes a user interface permitting users at said first
site to communicate with users at the second site.
73. The system of claim 72, wherein said user interface permits
coordination of competition between users at said first site and
users at said second site.
74. The system of claim 72, wherein said user interface permits
viewing at said first site of target detection results from said
second site.
75. The system of claim 72, wherein said user interface includes a
web site.
76. The system of claim 56, wherein said communication network is a
global communication network
77. A laser firearm system for firearm competition or training
involving firing a firearm toward a target without use of
projectiles, the system comprising: a training firearm including a
trigger, a barrel and a laser transmitter module that emits a laser
signal in response to a mechanical wave produced by pulling of the
trigger and sensed by the laser transmitter module; a
laser-detecting target adapted to detect the laser signal and
produce a laser detection signal; an ultrasonic transmitter coupled
to said training firearm and adapted to transmit an ultrasonic
signal simultaneously with the laser signal; an ultrasonic detector
coupled to said laser-detecting target and adapted to detect an
arrival time of the ultrasonic signal at said laser-detecting
target; and a processor coupled to said laser detecting target and
said ultrasonic detector, said processor being responsive to the
laser detection signal for generating information indicating a hit
location of the laser signal on said target, and determining a
distance between said training firearm and said laser-detecting
target from a time delay between an arrival time of the laser
signal at said laser-detecting target and the arrival time of the
ultrasonic signal.
78. The system of claim 77, wherein the system prevents cheating
caused by locating said training firearm improperly close to said
laser-detecting target by reporting the distance between said
training firearm and said laser-detecting target together with the
information indicating the hit location.
79. A laser firearm system for firearm competition or training
involving firing a firearm toward a target without use of
projectiles, the system comprising: a training firearm including a
trigger, a barrel and a laser transmitter module that emits a laser
signal in response to a mechanical wave produced by pulling of the
trigger and sensed by the laser transmitter module; a
laser-detecting target adapted to detect the laser signal and
produce a laser detection signal; and a processor responsive to the
laser detection signal for generating information indicating a hit
location of the laser signal on said target, wherein said processor
determines a center of gravity of a group of laser signals
sequentially detected by the laser light detectors.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority from U.S. Provisional
Patent Application Serial No. 60/056,937, entitled "Instrumented
Target for Scaled Target Training", filed Aug. 25, 1997. The
disclosure of that provisional patent application is incorporated
herein by reference in its entirety.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a firearm training system
employing laser-emitting firearms and laser-detecting targets, and,
more particularly, to a training firearm having a laser module that
emits laser pulses along a centerline of the barrel of the firearm
toward a laser-detecting target which may be linked via a computer
network to similar, remotely-located training systems.
[0004] 2. Description of the Related Art
[0005] Shooting sports today include a variety of competitions
including firing handguns, rifles and other firearms at bull's eyes
and other types of targets. Measures of performance used to
determine relative and absolute success include accuracy, speed,
shot grouping, range and a host of combinations of these and other
criteria. A combination of skills, competitive talents, and firearm
performance is required to enable someone to compete successfully
in the shooting sports. The skills involved include the integrated
act of combining marksmanship fundamentals, such as proper firing
position, trigger management, secure grip and correct sight
picture. Competitive talents associated with the various shooting
sports include being able to shoot accurately on the move, being
able to draw a handgun from a holster, and being able to control
breathing and movement so as to create a very stable platform for
achieving pinpoint accuracy on a target.
[0006] The history of shooting as a sport reaches as far back as
the invention of the first firearms. In excess of 10 million
Americans regularly participate in one of the forms of officially
recognized shooting sports. Varieties of shooting sports are part
of both the summer and winter Olympics. Shooting is an
internationally recognized competitive. endeavor with its own
championships, sponsors, competitve programs and sanctioning
agencies. It is also a vibrant and dynamic sport, with new events
and competitive options emerging frequently, e.g., cowboy action
shooting.
[0007] Unfortunately, shooting sports suffer from a number of
limitations and constraints that threaten the present and future
vitality of the pastime. Foremost among these limitations are those
associated with the shooting process itself. When a firearm is
fired, some form of projectile is ejected from the firearm toward
the target. This projectile (e.g., a bullet, musket ball, shot, BB
or pellet) has the capability to injure or kill. The fact that the
sport of shooting currently requires impact of a projectile with a
target introduces a safety problem that limits the sport both
physically and from an image point of view, contributing to the
controversy now surrounding the private ownership of firearms.
[0008] It is undeniable that the tragedies associated with
firearms, as well as the criminal acts committed with firearms,
have harmed the image of the sport. In countries such as the United
Kingdom and Australia, firearm-related tragedies have led to the
banning of all private ownership. No distinction is made regarding
firearms reserved for sporting purposes. In many countries, such as
Japan, ownership of private firearms has been illegal for some
time.
[0009] The projectile fired by the firearm puts further constraints
on the sport of shooting. Safety dictates that proper barriers and
cleared areas be in place to prevent bystanders from being hit by
direct fire and ricochets. This limits the ability of spectators to
view competition. Special ranges are needed in order to conduct
shooting sports anywhere within populated areas. These ranges are
expensive to construct in accordance with zoning restrictions and
expensive to insure. Moreover, competitions must be conducted at a
common range (i.e., not at multiple, remote ranges) to ensure fair
competition and to prevent the possibility of cheating.
[0010] Because spectators are restricted to watching shooting sport
events from a safe distance behind the competitors, it is very
difficult for the audience to see how the competition is
progressing at any given time. In many circumstances, all of the
firing must cease before targets can be inspected and scored. The
audience must wait for this process to learn how their champion or
team has fared. These constraints limit the audience of the sport,
reducing its attractiveness in this age of computerized
interactivity and immediacy to the participants themselves.
[0011] Equally problematic is the projectile, and specifically the
lead bullet fired by most firearms. Lead is toxic, and the lead
residue, including dust and other fragments, contaminate ranges of
both the indoor and outdoor variety. Environmental protection laws
are very strict in this regard, forcing range operators both to
install expensive air cleaning and handling systems and to
remediate existing range facilities.
[0012] Thus, while the sport of shooting is popular, enjoys a long
heritage, and does meet all of the criteria for both individual and
team competition, the very nature of the process of shooting is
itself limiting. The Unfortunate linkage to criminal and tragic
acts further limits the potential of the sport and, in many cases,
has directly led to its restriction.
[0013] Further, there is an ongoing need to train law enforcement
officers and soldiers in the use of firearms, but using live
ammunition at realistic ranges requires space and material which
can be difficult to provide. The normal course of instruction (COI)
relies on the use of live ammunition, and is called "live fire
training." Live fire training is dangerous, requiring properly
surveyed and sized ranges, barriers and impact areas, and the use
of lead bullets in live fire training is a pollution hazard, with
associated remediation expenses. The U.S. government presently is
spending considerable sums to clean up lead pollution at live fire
ranges across the country, and an alternative to live fire training
would be desirable from a remediation cost savings point of view
alone.
[0014] Marksmanship training is intended to build and refine
individual skills. However, in the case of most military units,
conducting live fire training is done collectively, in that all of
the members of the unit go to the firing range together. Primarily,
this is due to the fact that live ammunition is carefully
controlled. Also, since live fire ranges are scarce resources,
their use must be scheduled. This entails significant advance
coordination and planning, especially for reserve component units
such as the Army and Marine Reserves of the Air and Army National
Guard. These units meet monthly, on weekends typically, at centers
of armories without suitable range facilities. Units must be
transported to and from suitable training ranges, which often are a
significant distance away, and supported with food and shelter
while at the range. Those experienced in such matters will
recognize that the ability to conduct suitable firearms training in
the centers and armories ("at home station"), on an individual
basis where needed, could provide significant savings and increase
training value.
[0015] For the training to be meaningful, a formal COI is imposed,
such as that noted for the M16A1 and M16A2 rifle in U.S. Army field
manual FM 23-9, and a test is required. This test assesses the
trainee's ability to meet the standards set forth in the. COI, and
is typically referred to as "qualification". Passing the test means
the trainee meets the standards and is qualified to use the
weapon.
[0016] The qualification test includes a requirement to engage and
hit standard targets of different sizes and having different shapes
disposed at various ranges from the trainee. The actual distance to
a target is called the range. Typically, rifle marksmanship skills
are tested out to ranges of 300 meters for modern military rifles,
and 25 to 50 meters for handguns. The longer ranges obviously
impose significant acreage requirements for live fire range
facilities. Consequently, the armed forces have formulated scaled
target alternate courses which use silhouette targets sized to
simulate different range-to-target distances based on fundamental
mathematical formulas, thereby allowing the soldier to practice
sight alignment skills on a sight picture of the appropriate size
for a simulated target at a given range.
[0017] These scaled target alternatives to actual distance ranges
still require the use of live ammunition in a live fire range, with
all the associated safety, pollution, and resource consumption
implications noted above. Thus, while the use of scaled targets
reduces the "real estate" required at the live fire range, it does
not eliminate the need for, and associated costs and penalties of
using a live fire range.
[0018] Both the Air Force and Navy have equivalent scaled target
qualification procedures. These scaled qualification targets are
accepted alternatives for testing the marksmanship skills of units
that do not have access to full scale ranges, or are otherwise
authorized to use scaled targets, and are therefore known as
"Alternative Course" targets. For example, the Army uses the target
shown in FIG. 1 which is called the "25 Meter Alternate C Course
Target". The 25 meter descriptor denotes the range to which all of
the targets have been scaled, and is the distance at which the
target is to be engaged by the trainee.
[0019] Ideally, the alternate course exercise is conducted with a
weapon which looks, feels and operates in a manner as close as
possible to an actual service rifle (or pistol). Preferably, the
simulated audible report shooting experience includes an audible
report and recoil.
[0020] These scaled targets suffer from many of the same problems
associated with all live fire training. In particular, a bullet
strike on the target cannot be differentiated from another strike
on the same target without some elaborate detection means at the
firing line, a location hit detection means at the target itself,
or an individual target inspection after each round fired. In all
cases, the costs associated with such discrimination means are
significant, with the result that they are rarely used. Training
assessment accuracy suffers as a result.
[0021] For example, in the Army 25 Meter Alternate C Course of
fire, the soldier is required to fire in two sessions to qualify.
The first session requires that the soldier fire 20 rounds, held in
two 10 round magazines, from a prone position with the weapon
supported on a sandbag. The soldier has 120 seconds to hit each of
the 10 scaled target silhouettes on the target (FIG. 1) two times.
Having the weapon supported on the sandbag provides added stability
to the weapon and enhances accuracy.
[0022] The second session requires that the soldier fire a second
string of 20 rounds from a prone position with the weapon
unsupported. Unsupported means that the soldier can use only his
arms, with elbows resting on the ground, to hold the weapon.
steady. The relative stability and accuracy of the unsupported
firing position is reduced relative to that of the supported firing
position.
[0023] Typically, since the paper targets are cheap and save time,
the two 25 meter targets required for the qualification test are
mounted side-by-side on a suitable backing in full view of the
trainee. The soldier is instructed to fire on one of the targets
first, and, after the 120 second period elapses and all 20 rounds
are accounted for, then the second target. However, since the
targets are the same, and since the smaller (greater scaled range)
targets are harder to hit, soldiers frequently engage all the small
silhouettes on both targets during the supported session. The
larger silhouettes (the 50 meter and 100 meter ranges) are left for
the unsupported session.
[0024] More generally, since the shooting range is "hot" during the
entire shooting exercise, it is not possible to closely inspect the
target and determine the order in which a shooter has engaged each
target and it is also not possible to determine whether a shooter
was aiming for a target at the time an impact was observed on that
target (i.e. that silhouette). Consequently, it is possible for an
unskilled shooter to shoot the targets in random order and still
obtain a qualifying score, since the silhouettes are clustered onto
a single sheet for alternate course qualification exercises.
[0025] Since the scoring takes place after both firing sessions are
complete (again to save time, since scoring the targets requires
that everyone cease fire so that the instructors can go downrange
and physically inspect the target), inaccurate assessments of the
soldiers' marksmanship skills may result. It should come as no
surprise that significantly lower test results are frequently
achieved when the soldiers are retested on the actual distance
ranges where the targets are presented randomly across the field of
view.
[0026] Thus, it can be seen that to take advantage of the scaled
silhouette target concept, it is preferable for the target to be
able to distinguish the location of each hit and the time sequence
of the hits, and to communicate that information to the
scorer/instructor in real time. Preferably, the target would
include a method for determining if the trainee is at the correct
range so that training and testing could be accomplished
autonomously.
[0027] To take full advantage of the scaled target concept, while
simultaneously avoiding the safety, pollution and other negative
issues associated with live fire, there is a need for a weapon
simulator that looks, feels and operates as the actual weapon but
does not fire a live round, and provides the full psycho-kinetic
experience to the trainee, including felt recoil, sound, and smell
that the soldier would realize on the live fire range. The
simulator would have an alternative and totally safe means for
accurately hitting the target. Preferably, the simulator would be
untethered so as not to restrict the trainee's movement, grip, or
position while firing, and would also require the trainee to
reload, charge and clear the simulator in the same manner as the
actual weapon so that no part of the value of live fire training is
lost. It is desirable that both the simulator and the target
support qualification testing with the weapon's standard day sights
as well as with the latest developments in night vision and thermal
detection systems so that the unit is not required to use a live
fire range at all.
[0028] Another drawback to live ammunition is its use in the
process of "zeroing" a sighted firearm. The process of correctly
adjusting the sight mechanism of a firearm typically involves two
steps. First, the sight mechanism of the firearm is aligned with
the centerline of the bore in a process known as "boresighting."
Boresighting achieves a coarse alignment which generally allows the
shooter to hit the target when the sight is trained thereon, though
the hit locations are typically clustered at a point off center.
This is because boresighting does not take into account the fact
that each shooter has a unique "sight picture", meaning that each
shooter aligns his or her eye with the sight slightly differently,
as a function of his or her proper firing position, thereby seeing
the location of the center of the target somewhat differently.
Assuming the shooter can repeatably take up the proper firing
position and fire a group of shots within a certain diameter on the
target, a fine adjustment (i.e., zeroing) of the sight mechanism
can be achieved by determining the offset between the center of
mass of the hits in the shot group and the center of the target,
and then adjusting the sight mechanism accordingly. By repeating
this process a number of times, the offset between the center of
the target and the center of mass of the shot group can be
minimized, such that the firearm is "zeroed" for a particular
shooter.
[0029] In order to determine the true offset accurately, it would
be advantageous to have many shots in the shot group for each
iteration of the zeroing process. However, numerous shots consume
ammunition resources. Further, it is difficult to estimate (by eye)
the center of mass of more than three hit points. For these
reasons, no more than three shots are typically fired for each
shot, group, with the consequence that the accuracy of the estimate
of the offset is limited, and more iterations of the zeroing
process may be required (relative to iterations with larger shot
groups). Consequently, it would be advantageous to be able to use
larger shot groups in the zeroing process without the attendant
difficulties in measuring the center of mass and without increased
usage of resources, in order to reduce the number of iterations
required to complete the zeroing process, thereby to save time.
[0030] Various systems for training a shooter without requiring the
firing of live ammunition have been proposed, including systems
incorporating optical and laser technology. The firing of blank
cartridges from firearms give the shooter a sense of how the
firearm will feel under live fire conditions. Blank firing
conversions for semiautomatic pistols are the subject of U.S. Pat.
Nos. 5,140,893, 5,433,134 and 5,585,589 (all to Edward J. Leiter),
the entire disclosures of which are incorporated herein by
reference. However, because such systems do not fire a projectile
at a target, the shooter is not provided with any feedback as to
whether the firearm was properly aimed or whether good follow
through was maintained.
[0031] In addition, laser drivers have been used for transmitting a
laser beam as a training aid in firearms, as disclosed in U.S. Pat.
No. 5,344,320, the entire disclosure of which is incorporated
herein by reference. In laser-based systems, a laser transmitter is
typically mounted to one side of the firearm's muzzle, and projects
a laser signal onto a target to simulate firing of a projectile and
a hit location. One problem with such systems is that the laser
signal is not projected along the longitudinal centerline of the
barrel (as a projectile would be); thus, the projection angle of
the laser must be slightly angled relative to the longitudinal
centerline axis of the barrel so that the laser signal hits the
target in the same location that a projection fired from the barrel
would hit the target. This arrangement introduces a parallax
problem, wherein the laser projection angle must be adjusted as a
function of the target range in order for the location of the laser
signal on the target to accurately reflect the location that 6
projectile would hit the. target.
[0032] To eliminate the parallax problem, it has been proposed to
mount a laser transmitter directly in the barrel of a firearm. In
particular, Bang Corporation has developed a cylindrically-shaped
laser module which slides into the muzzle of a pistol and is held
in place by frictional force. When the firearm trigger is pulled,
the laser module detects resonance of the fall of the hammer and
emits a visible laser signal which can be seen on a paper target or
the like. However, because the laser module rests within the
barrel, the firearm cannot fire live ammunition or even a blank
while the laser is in use, and the trainee feels only a "click" of
the hammer upon pulling the trigger. Consequently, the in-barrel
laser does not allow the trainee to experience any recoil or firing
effects whatsoever, and provides a poor simulation of the
psycho-kinetic experience associated with operating the firearm
with live ammunition, with no audible report or recoil. Further,
live ammunition can accidentally be loaded and fired while the
laser is within the barrel, presenting a potential safety hazard to
the trainee and others in the vicinity.
[0033] Moreover, many laser-emitting firearm training devices,
including the Bang Corporation's in-barrel laser, simply project a
laser signal on a paper target or the like without any detection of
the laser signal, thereby requiring simultaneous visual inspection
of the target, and making these devices unsuitable for the
aforementioned military training exercises involving a sequence of
firings.
SUMMARY OF THE INVENTION
[0034] It is an object of the present invention to solve the
aforementioned problems. while preserving as much of the essence of
shooting sports as possible, so that the experience is not
diminished and the attractiveness of the sport can actually be
expanded.
[0035] It is another object of the present invention to provide a
training firearm which closely simulates the experience of live
firing, including an audible report and recoil of the firearm,
without firing a projectile.
[0036] It is yet another object of the present invention to permit
realistic firearm training without the space and expense associated
with a live fire range and the environmental and safety hazards
associated with use of live ammunition.
[0037] It is a further object of the present invention to improve
the ability of spectators or trainers to view shooting competitions
or training exercises.
[0038] It is yet a further object of the present invention to
enable automatic scoring of each target hit, including a
determination of the order of target hits.
[0039] Another object of the present invention is to more
accurately assess a trainee's marksmanship skills on standardized
targets.
[0040] Yet another object of the present invention is to make
competition and training more practical by eliminating the need for
a live fire range and by allowing competition or coordination of
exercises between shooters at different locations.
[0041] A further object of the present invention is to ensure fair
competition and prevent cheating among people competing from
multiple locations.
[0042] Yet a further object of the present invention is to improve
the process of zeroing the sight mechanism of a firearm by
automatically determining a center of mass of shots groups, which
may be of any size, without use of live ammunition.
[0043] The aforesaid objects are achieved individually and in
combination, and it is not intended that the present invention be
construed as requiring two or more of the objects to be combined
unless expressly required by the claims attached hereto.
[0044] According to the present invention, a laser pulse is
substituted for the projectile of conventional firearms.
Preferably, this laser is eye safe, as defined by appropriate ANSI
and U.S. Food and Drug Agency standards. This one change lifts
immediately the major constraints facing the sport of shooting, in
that both the safety and the pollution issues raised by the use of
lead bullets are answered. Preferably, the laser transmitter fits
directly into the barrel of the firearm and emits a laser pulse
along the longitudinal centerline of the barrel to avoid any
range-dependent parallax problems.
[0045] In accordance with one embodiment of the present invention,
the training firearm is formed by replacing the conventional barrel
of a firearm with a training barrel which preserves the look, feel
and firing action of the conventional firearm. Specifically, the
bore of the training barrel is completely blocked by a solid wall
extending transversely through the barrel and separating the bore
of the barrel into a proximal firing chamber sized to chamber only
a blank cartridge adapted for use with the training barrel, and a
distal cavity which houses a laser transmitter module. The laser
transmitter module can be permanently mounted within the cavity or
can be a cylindrically-shaped removable module which is threadably
or slidably insertable into the muzzle of the barrel. The laser
transmitter module includes a mechanical wave sensor which senses a
mechanical wave from the discharge of the blank cartridge and
triggers the laser transmitter to emit a laser signal. The laser
transmitter module does not protrude significantly from the muzzle
and therefore does not affect the holstering of the firearm. The
training firearm used in conjunction with the firearm training
system of the present invention can also take the form of a firearm
specifically designed to fire only laser signals or a conventional
firearm fitted with a removable laser transmitter module which is
inserted into the muzzle of the barrel.
[0046] The firearm training system of the present invention further
includes a laser-detecting target having a planar array of laser
light detectors which detect the location and timing of laser
pulses received at the target. Preferably, the laser pulses are
modulated with a particular modulation signal, and the laser light
detectors are configured to detect the modulated laser pulses in
order to mitigate the effects of interference. The laser light
detectors can be arranged in any manner to simulate any type of
competitive or training target. In particular, the laser light
detectors can be arranged to simulate a military scaled target,
such as the 25 Meter Alternate C Course Target.
[0047] The laser-detecting target is connected to a computer which
analyzes target hit information, keeps track of hits information
and statistics, and displays feedback or scoring information. The
target and computer provide real time feedback on the location of
each laser shot thus allowing a referee, trainer, or spectators to
see how the shooter is performing during the shooting exercise.
Further, more accurate assessment of marksmanship skills is made
possible, because the order and timing of shots is recorded, and
credit is given only for hitting an intended or specified target on
a particular shot.
[0048] The computer can be connected via a communications network,
such as the Internet, to similar systems, so that competitions or
training exercises can be conducted across multiple geographic
locations. Such competitions or exercises can be controlled from a
central system or unit which may be accessible to individual
shooters via an Internet web site.
[0049] To permit unsupervised competition, the present invention
includes means for preventing cheating among competitors at
different locations. Specifically, an ultrasonic transmitter is
incorporated into the training firearm and emits an ultrasonic
signal at the same instant as the laser pulse is transmitted by the
laser transmitter. An ultrasonic detector detects the arrival of
the ultrasonic signal at the target, and the target determines a
time delay between the laser pulse and the ultrasonic signal. This
time delay is used to calculate the distance between the training
firearm and the target, which distance is reported to a referee or
to other competitors, and prevents a competitor from cheating by
standing closer to the target than the specified range.
[0050] The firearm training system of the present invention also
allows closed-loop zeroing of a sighted firearm. Specifically, the
system automatically calculates the center of gravity (relative to
a center of the target) of a group of three or more shots to enable
accurate assessment of the required realignment of the sights.
Because the system permits shot groups containing more then the
conventional three shots, a more accurate offset can be determined
with each iteration of the zeroing process, thereby reducing the
number of required iterations.
[0051] The above and still further objects, features and advantages
of the present invention will become apparent upon consideration of
the following detailed description of a specific embodiment
thereof, particularly when taken in conjunction with the
accompanying drawings wherein like reference numerals in the
various figures are utilized to designate like components.
BRIEF DESCRIPTION OF THE DRAWINGS
[0052] FIG. 1 is a representation of the U.S. Army's 25 Meter
Alternate Course C Target.
[0053] FIG. 2 is a sectional view of a firearm training barrel in
accordance with an exemplary embodiment of the present
invention.
[0054] FIG. 3 is a diagram of an exemplary embodiment of the
firearm training system of the present invention.
[0055] FIG. 4 is a diagram of an embodiment of the firearm training
system of the present invention employing a laser-detecting target
configured to replicate the U.S. ARMY'S 25 Meter Alternate Course C
Target.
[0056] FIG. 5 illustrates the interconnection of the target shown
in FIG. 4 with the computer of the firearm training system.
[0057] FIG. 6 illustrates another embodiment of the training barrel
of the present invention in which an ultrasound transmitter is
incorporated into the training barrel.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0058] The firearm training system of the present invention
includes a training firearm which emits a laser pulse when fired
under conditions closely simulating the firing of a projectile, a
target adapted to detect laser pulses, and a computer system which
determines and stores information relating to laser pulse
detections, which system may be linked via a network to similar,
remotely-located training systems.
[0059] FIG. 2 illustrates an exemplary embodiment of a training
barrel 10 for a training. firearm in accordance with one aspect of
the firearm training system of the present invention. Training
barrel 10 can be a drop-in replacement barrel for a pistol having a
removable barrel. Similarly, the training barrel of the present
invention, together with an upper receiver, can serve as a drop-in
replacement barrel and upper receiver for a rifle.
[0060] As illustrated in partial cross-section in the diagram of
FIG. 2, a drop-in replacement barrel 10 for a pistol (or rifle)
includes a barrel-shaped (i.e., having the shape of a typical
firearm barrel) main body 12 defining a substantially cylindrical
bore along a longitudinal centerline of main body 12 with openings
at the proximal and distal ends. Body 12 is made from stainless
steel or another conventional material. The bore 20 of barrel 10 is
completely blocked by a solid steel section or wall 14 extending
transversely through main body 12 and separating the bore of the
barrel into a first substantially cylindrical cavity 16 extending
from the proximal end to wall 14 and a second substantially
cylindrical cavity 18 extending from the distal end to wall 14.
[0061] The first cavity 16 extending inward from the proximal end
of the barrel 10 serves as a firing chamber and is sized to
accommodate a specially adapted blank cartridge 20. By correctly
sizing the powder charge in the blank cartridge 20 at approximately
1/4 the normal powder charge, there is no adverse affect upon the
weapon's original live-fire performance and so basic weapon
familiarization and training are readily accomplished. Since the
bore of the training barrel is occluded, there is no forward
discharge whatsoever from the muzzle (i.e., the distal end), and
the firearm may be fired at point blank range without creating a
hazardous condition. The chamber formed by cavity 16 of barrel 10
is sufficiently short so as not to allow a live round to be
chambered, and the head space of cavity 16 is sized so as not to
allow a normal blank round to be chambered. In the preferred
embodiment, training barrel 10 has a residual discharge only from
the ejection port of the weapon. Preferably, barrels are color
coded at the ejection port and the muzzle for immediate
identification as blank fire units and are marked with the
appropriate model and caliber designation as well as with the
proper training blank loading. That color coding is matched by
color coding on the specially adapted blank ammunition in order to
prevent a dangerous mismatch of ammunition to the training barrel.
Preferably, blank cartridge 20 is all brass, includes no wad, and
uses non-corrosive primer and powder materials.
[0062] The second cavity 18 extending inward from the distal end of
the barrel 10 is adapted to hold a laser transmitter module 22. In
accordance with an exemplary embodiment of the present invention,
the laser transmitter module 22 is a cylindrically-shaped removable
module having a threaded outer surface. As shown in FIG. 2, the
interior surface of body 12 forming the wall of cavity 18 is
threaded to receive the outer threaded surface of cylindrical
module 22, such that module 22 can be threadably inserted or
screwed into cavity 18. Alternatively, the laser transmitter module
can slide into cavity 18 and can be held in place by frictional
force or longitudinal grooves.
[0063] Laser transmitter module 22 includes a power source
comprising first and second button batteries 24 and 26, a
mechanical wave sensor 28 and an optics package 30 for projecting a
laser beam distally through lens 32 toward a target. The laser beam
is triggered in response to a mechanical wave sensed from the
discharge of a blank. As used herein, the term "mechanical wave" or
"shock wave" means an impulse traveling through the barrel
structure. When the trigger of the firearm is pulled, the blank
cartridge is fired (explodes), and creates a mechanical wave which
travels distally down the training barrel toward laser transmitter
module 22. Mechanical wave sensor 28, which may include a
piezoelectric element, an accelerometer or a solid state sensor
such as a strain gauge, senses the mechanical wave from the
discharge of blank cartridge 20 and generates a trigger signal.
Optics package 30 responds to the trigger signal generated by
mechanical wave sensor 28 by generating and projecting a laser beam
toward the target. The shock wave travels faster in the barrel than
a fired bullet would travel; however, the delay associated with the
shock wave reaching mechanical wave sensor 28 and the time required
to activate optics package 30 and illuminate the target is
approximately equal to the bullet travel time in a live fire
exercise.
[0064] Preferably, optics package 30 includes a class 1 laser (of
either 630 or 670 nanometer wavelength) and is ruggedized to
maintain the aim point over many simulated rounds of fire. Optics
package 30 and/or lens 32 can be adjusted to eliminate any azimuth
or elevation angular offset between the direction that the laser
pulses are projected and the longitudinal centerline of the bore of
the barrel. For example, the laser transmitter module 22 with
optics package 30 can be threadably inserted into the bore from the
muzzle, as shown in FIG. 2, and then can be adjusted for azimuth
and elevation at the factory or by the user.
[0065] The laser signal emitted by the laser transmitter module of
the present invention is a laser pulse. To account for the effect
of recoil on barrel orientation, the pulse width of the transmitted
pulse is set to approximately ten milliseconds thus allowing the
system to measure an individual shooter's ability to "follow
through" after the shot. For large ranges from the target, the
effect of recoil and poor follow through can cause a. target to be
missed.
[0066] The laser signal is preferably modulated. By way of
non-limiting example, a 40 kilohertz amplitude modulation can be
applied to the laser pulse. The signal processing circuitry used in
conjunction with the target of the present invention (described
hereinbelow) is adjusted to detect a laser signal modulated with a
40 kilohertz signal and is thereby provided with further protection
against false hits which may be caused by spurious emissions of
light in the presence of the detectors on the target.
[0067] It should be noted that the present invention is not limited
to removable laser transmitter modules; the laser transmitter
module can be permanently attached and mounted within cavity 18 or
fully integrated with body 12, with an opening to replace the
battery power source and, optionally, controls to adjust the laser
transmission direction.
[0068] An important aspect of the present invention is that the
transmitter laser module does not alter the holstering of the
firearm (in the case where the firearm is a holstered weapon, e.g.,
a semi-automatic pistol). The laser transmitter module 22 barely
protrudes from the distal end of body 12 when threadably or
slidably inserted into the muzzle of barrel 10. This is an
important consideration, since many law enforcement officers are
required to enter a potentially dangerous crime scene with the gun
holstered, thereby demonstrating no prior intent to shoot, and
training exercises which would employ the training barrel of the
present invention would therefore involve holstering. Preferably,
the laser module protrudes from the distal end of body 12 (i.e.,
the muzzle) by less than 1 cm and more preferably no more than a
few millimeters. Where the laser transmitter module is permanently
mounted within the bore of the training barrel, the laser
transmitter module need not protrude at all from the muzzle.
[0069] As will be understood from the foregoing, the training
barrel of the present invention permits the firing of a blank
cartridge in conjunction with emission of a laser pulse along the
centerline of the bore of the barrel in order to create a realistic
simulation of a live fire conditions, including the felt recoil and
the firing sound. Since live ammunition cannot be chambered in the
training barrel and no material can be discharged through the
muzzle, the training barrel presents no safety hazard.
[0070] The training barrel 10 permits blank fire without discharge
from the muzzle at the barrel distal end and permits repetitive
fire with reliable cycling of a gas-operated (compressed air or
CO.sub.2) semi-automatic weapon. Preferably, the training barrel
requires no permanent alteration of a service rifle or
semi-automatic pistol and requires no replacement of any parts
(other than the barrel or upper receiver) such as the recoil spring
or magazine. With the blank fire training barrels of the present
invention, a soldier can install or remove the drop-in barrel by
field stripping methods and can then alter the service weapon into
a training weapon having the original appearance and holstering
capability (for pistols) of the service weapon.
[0071] Although the training barrel described above replaces a
convention barrel of a firearm to convert a conventional firearm
into a training firearm, the training barrel of the present
invention need not replace another barrel or even be removable. In
accordance with another embodiment of the present invention, the
aforementioned training barrel can be part of a training firearm
designed specifically for use as a training firearm.
[0072] The firearm training system of the present invention
includes a laser-emitting training firearm, such as that described
above, as well as a laser-detecting target and. a computer system
which processes detection information. An exemplary embodiment of
the firearm training system of the present invention, including a
training firearm 40, a laser detecting target 42, a computer 44,
and a printer 46 (optional), is shown in FIG. 3.
[0073] Training firearm 40 can take the form of a conventional
firearm fitted with the above-described replacement training
barrel. Alternatively, training firearm 40 can be a conventional
firearm having a cylindrical laser transmitter module inserted into
the muzzle of the barrel. In this embodiment, firearm 40 is not
loaded with live ammunition or a blank when using the laser
transmitter. The laser transmitter is activated by the fall of the
hammer or the striker, sending a mild shock wave down the barrel of
the firearm and activating the laser transmitter. Preferably, the
transmitter is very lightweight, so as not to alter the perceived
balance and feel of the firearm.
[0074] In accordance with another embodiment, training firearm 40
can be a laser-emitting firearm that is incapable of firing a
projectile and that is designed for use only in training. Training
firearm 40 can resemble actual firearms, to meet the aesthetic,
competitive, commercial or functional needs of the user. According
to this embodiment, the laser optics can be permanently integrated
into the barrel of the firearm. Because the firearm is not able to
fire a live round under any circumstance, it does not require
licensing and control by the appropriate authorities such as the
Bureau of Alcohol, Tobacco and Firearms (BATF) in the U.S.
[0075] Importantly, whether the training firearm is a training-only
device, a conventional firearm with a laser module inserted in the
barrel, or a conventional firearm fitted with a training barrel,
the laser transmitter of the training firearm 40 of the present
invention is preferably concentric to the bore of the barrel. This
eliminates the problem of parallax associated with laser aiming and
boresighting devices that are appended outside and alongside the
barrel. The accuracy of such externally mounted lasers is highly
range sensitive and requires constant realignment, making proper
operation of such lasers difficult to understand and inconvenient
to use.
[0076] Target 42 is responsive to the laser pulses emitted by
training firearm 40 and provides appropriate feedback to the
shooter via computer 44 or printer 46. As shown in FIG. 3, by way
of non-limiting example, target 42 may take the form of a circular
bull's eye, with a visible surface having circular lines drawn at
regular radial intervals and horizontal and vertical lines which
divide the target into quadrants. A plurality of laser light
detectors or sensors are arrayed across the surface of target to
detect the arrival of laser pulses emitted from training firearm
40. The arrangement of the laser light detectors is such that the
location of a laser hit anywhere on the face of the target can be
determined from the laser detection signals generated by one or a
combination of the laser light detectors in the array.
[0077] Preferably, the laser light detectors are not sensitive to
light energy coming from other sources, including those found in a
home or indoor environment and sunlight. In particular, external
light sources such as fiqurescent lighting systems, infrared
security systems, and other electro-optical emissions are filtered
out so that the laser light detectors do not report erroneous hits
or become desensitized by electromagnetic interference. To prevent
such interference from impacting laser pulse detection, the laser
light detectors and associated signal processing circuitry are
preferably adapted to discriminate laser pulses that are encoded or
modulated in a particular manner by the laser transmitter of
training firearm 40. For example, the laser pulses can be amplitude
modulated with a 40 Hz signal in the manner described above, and
the laser light detectors can include signal processing for
isolating the modulated laser pulses from other signals and
interference. Other modulation or pulse encoding schemes may be
used, and the laser light detectors may employ any variety or
combination of techniques for distinguishing an electromagnetic
signal from noise and interference, including, but not limited to
matched filtering and range/time gating.
[0078] Optionally, individual firearms can emit uniquely modulated
or encoded laser pulses which are distinguishable to the laser
light detectors, to allow the firearm training system to identify
the individual source of each laser pulse detected. This feature is
useful when more than one shooter may be simultaneously or
sequentially engaging a target or a set of targets.
[0079] Each of the laser light detectors provides an electrical
detection signal to a corresponding line driver, and the signal is
transmitted over a shielded cable or a short-distance wireless link
(e.g., radio frequency or infrared) to a portable (laptop) or
desktop computer 44. Power can be supplied to target 42 via a cord
from a conventional AC power source, or target 42 can be battery
powered. Computer 44 runs software which analyzes the electrical
detection signals and provides feedback information about laser
detections to the shooter, scorer or trainer via a display and/or
printer. More specifically, the computer processes the electrical
detection signals and provides the X-Y coordinates of the hit in
the plane of the target face, the time of the hit, and the
validation that the laser pulse was from a suitable laser. Further,
the computer can keep track of a sequence of shots, and determine
information such as the time between hits, mathematical analysis of
the grouping information from multiple hits on a target, and the
possible cause of shooting errors based on the interpretation of
the variance between the point of aim and the point of impact, and
report scoring or qualifying information for a shooter engaging the
target in a competition or training exercise.
[0080] It will be understood from the foregoing that signal
processing of detected laser pulses and data processing of the
electronic detection signals are performed by a combination of
target 42 and computer 44 in order to provide feedback information
to the shooter. However, the performance of the signal and data
processing required to produce output information is not limited to
any particular allocation between target 42 and computer 44. Thus,
for example, target 42 can send relatively "raw" detection
information to computer 44, with computer 44 performing significant
signal processing.
[0081] Conversely, target 44 can include onboard microprocessor and
memory capabilities, such that the target simply reports the
aforementioned feedback information to computer 4 for display,
printing or transmission.
[0082] While the target shown in FIG. 3 is in the form of a single
bull's eye, the shapes and sizes of the targets of the present
invention are not limited and can be configured to meet all of the
currently sanctioned shooting competition requirements.
Furthermore, multiple targets at one range or location can be
connected to a single computer for processing of laser hits of one
or more shooters on the targets.
[0083] In accordance with a preferred embodiment of the present
invention, the firearm training system of the present invention
includes a set of targets adapted for use in military qualification
exercises. As illustrated in FIG. 4, a plurality of laser light
detectors or sensors is arrayed in a pattern to form a
laser-detecting target 52 corresponding to the U.S. Army's 25 Meter
Scale Target Alternate C Course qualification target (FIG. 1),
where one detector is sized and positioned for the 300 meter
silhouette, one detector is sized or positioned for the 250 meter
silhouette, two detectors are sized and positioned for the 200
meter silhouettes, two detectors are sized and positioned for 150
meter silhouettes, three detectors are sized and positioned for 100
meter silhouettes, and one detector is sized and positioned for the
50 meter (largest) silhouette. Optionally, two or three detectors
may be sized and positioned for the 50 meter silhouette. A training
firearm 50, which is similar in size, shape and feel to the actual
service firearm used with the live fire scaled target, emits laser
pulses along the longitudinal centerline of the barrel toward the
target in the manner described above.
[0084] As shown in FIG. 5, each laser light detector of the scaled
target provides an electrical detection signal to a corresponding
line driver, and the signal is transmitted over a shielded cable to
computer 44 via a power supply and local interface. Computer 44 is
programmed with software adapted to score the sequence of laser
hits in accordance with qualification requirements and produces a
standard format scoring record (e.g., a printed form). The laser
detection system advantageously allows each laser hit to be
individually scored as it is fired by the shooter. In this case,
the two 120 second segments of the exercise can be conducted while
the range is hot and each shot can be scored, thereby avoiding the
confusion associated with allowing the shooter to fire both ten
round clips into the target before attempting to score the target,
as discussed above. Unlike conventional scaled target qualification
with live fire, because, the timing and location of each shot is
determined by the system, the trainee does not receive credit for
hitting one target when attempting to hit another, and the trainee
cannot "cheat" by firing at the long range targets primarily during
the supported session and at the short range targets primarily
during the unsupported session.
[0085] The laser-detecting targets of the firearm training system
of the present invention can also be pop up or active targets at
conventional ranges (e.g., three hundred meters or more). A
wireless communication link is preferably used to transmit
information from the active target of the present invention to a
scoring computer for shot-by-shot reporting of the qualification
exercise results. The information provided by the sensors detecting
the laser pulse can also be used to activate a host of devices,
such as flash bang generators, target turning and lifting
mechanisms, and even animated or computerized results
(e.g.,explosions, bullet holes, etc.).
[0086] Computer 44 is capable of receiving, processing and
displaying hit information in real time, such that a scorer,
instructor or spectator may view the progress of a shooting
competition or training exercise while in progress. For shooting
competitions, the display can be provided at the shooters location,
for the immediate viewing audience, and simultaneously, at multiple
locations worldwide. Optionally, the firearm system of the present
invention includes a standard printer 46 (FIG. 3) for printing out
shooting details including diagnosis of problems and suggested
training solutions for correcting a shooters technique.
[0087] In accordance with another aspect of the present invention,
the firearm training system includes a linked network of
laser-detecting targets and computers located at a single site or
at multiple sites. Each target can be connected to a corresponding,
computer which is in turn linked to a central computer acting as a
server. Alternatively, the server can receive the information from
multiple targets and process each in turn through efficient
software processing. The system includes the electronic linkage
required to interconnect the target/computer network at one
location with a similar network at one or more geographically
separate locations. A candidate for such a link is the Internet, an
operational, global, and readily accessible real time digital
information exchange. Alternatively, a dedicated network using
optical, wire and/or satellite communication links can be
employed.
[0088] All of the information captured from the laser hit on target
can be reduced to a digital format. Consequently, using the
proposed invention, it is possible for a shooting sport competitor
in one location to fire at a target and have the result, both in
terms of location on target and the resulting score/effect,
displayed immediately at multiple locations worldwide. The ability
to electronically link multiple firing points, or competition
sites, facilitates global shooting sports competitions without the
associated costs of travel. Organizations such a shooting clubs,
college teams, and commercially sponsored teams can compete against
one another whenever they desired, regardless of time/distance
constraints.
[0089] The cost of maintaining a suitable live fire range at or
near the campus has caused many colleges to eliminate their
shooting sports program. The present invention eliminates the need
for such a range. In addition, the cost of traveling to other
schools or competition sites, a significant expense and application
of time, would be eliminated, would reinvigorate shooting sports at
the college level.
[0090] More generally, in accordance with the present invention, a
facility can have several computer/target "firing points". This
enables teams to compete against each other without having to
travel to distant locations. A number of computer/target "firing
points" at one location can be linked into a local area network
(LAN) and that LAN can in turn be linked to one or more LANs some
distance away. The Internet or other network serves as a wide area
network (WAN) for the purpose of multi-team competitions.
[0091] In accordance with another embodiment of the present
invention, an Internet web site serves as a competition control
unit. Potential competitors "log on" to the Internet using standard
protocols and procedures, and access the electronic shooting sports
web site in a conventional manner. The procedures for accessing a
web site are well known and need not be described here. Once at the
electronic shooting sports web site, the potential competitor
identifies himself or herself to the site with pertinent
information such as name, social security number, or some
membership ID information. This enables the control unit to access
the competitor's prior competition history and store information
from the present session. The system automatically "shake hands"
with the competitors computer, and thereby with the target to
ensure that the proper equipment is in place and operational.
[0092] In order to minimize the amount of data required to flow
back and forth over the Internet (e.g., X-Y hit locations, hit
timing, shot number, etc.), the event for competition can be
selected from a menu of options available at the competitors
location, and control of the event at the competitor's site (e.g.,
presentation of pop-up or moving targets) can be controlled from
the competitor's local computer rather than from commands sent from
the competition control unit over the Internet. As the throughput
capacity of modems and linked networks such as the Internet
expands, the opportunity to send real time video scenarios,
including moving targets (i.e., skeet, trap, pop up), and animated
target reactions (fall down, explode, shoot back), from the web
site to the competitor will expand.
[0093] In accordance with yet another embodiment of the present
invention, the firearm training system of the present invention can
present video/graphic target scenarios on a wall or screen via
connection to one or more digital video projection systems.
Examples of such projection systems include products by Sony,
Proximal, and Panasonic. The impact point of the laser fired at
such a projection can be determined with some accuracy by hit
detection cameras properly calibrated to see the projected target
area. The process by which such hit detection cameras operate is
known. Such hit detection cameras see the laser hit on target
generated by the transmitter described above.
[0094] Since these video projection systems tend to be expensive,
it is most likely that the use of such moving target shooting
sports events will be conducted at local competition sites. Since
there is no hazard whatsoever in the process or equipment used to
conduct electronic shooting sports, these competition sites may be
established at convenient locations such as recreation centers,
shopping malls, bowling alleys, and sports clubs. Traditional
shooting ranges and clubs may also install them. Because the
equipment is portable and easy to set up, competition sites may be
set up as part of temporary events such as state fairs, special
championships at sports halls and auditoriums, and the like.
[0095] The capability to coordinate competitive shooting events or
training exercises simultaneously conducted at multiple sites
introduces unique problems and issues. In particular, it becomes
possible for a competitor or trainee at one site to gain an unfair
advantage over other competitors by shortening the range to the
target, supporting the training firearm in an unauthorized manner
(e.g., fixing or mounting the firearm in a vice), or using a more
accurate firearm than other competitors or trainees. The
opportunity for cheating in such a manner is, of course, increased
in circumstances where the competitor or trainee is not directly
observed by officiating or supervisory personnel. To minimize the
potential for cheating, the firearm training system of the present
invention employs means that allow competitors at one location to
be reasonably certain of the accuracy and fairness of the results
achieved at any other location without requiring the presence of
some neutral observer or referee at each competition site. The
inclusion of such a cheating prevention methodology in the
invention expands the scope of the potential use to individual
homes, millions of which are already linked to the Internet.
[0096] In accordance with one technique for preventing cheating, an
ultrasonic transmitter is incorporated in the training firearm of
the present invention and transmits an ultrasonic acoustic signal
at the instant the laser fires, thereby providing an acoustical
signal traveling at a known speed (i.e., the speed of sound). The
target includes an ultrasonic receiver adapted to detect the
ultrasonic pulse transmitted from the training firearm. Since the
laser pulse travels at the speed of light and the ultrasonic signal
travels at the speed of sound, a measurable delay exists between
the arrival time of the laser signal at the target and the arrival
time of the ultrasonic signal at the target. An accurate estimate
of the distance to between the firearm and the target can be
calculated by multiplying the time delay between the laser and
ultrasonic pulses by the speed of sound (this estimate ignores the
travel time of the laser pulse to the target, which is less than 1
microsecond). This range calculation can be performed by the target
receiver electronics or by the computer. This range calculation,
which is reported via the network to a controlling unit, indicates
whether the competitor is too close (or too far) from the target,
thereby defeating any attempt at cheating in a competition or
qualification exercise (by shooting from an easier and shorter
distance from the target). This allows competition and
qualification exercises to be conducted in a completely automated
fashion, thereby avoiding requirements for additional personnel to
observe and score the exercise in person. The ultrasonic
anti-cheating feature is well suited to simultaneous head-to-head
competition over communications networks, such as the Internet in
which competitors in different geographic locations can compete
simultaneously and in large groups.
[0097] Referring to FIG. 6, the training barrel shown in FIG. 2 can
be modified to incorporate an ultrasonic transmitter 34. Optics
package 30 and lens 32, which are concentric with the longitudinal
centerline of the barrel, are sized to permit ultrasonic
transmitter 34 to be positioned along the periphery of the optics
package within barrel 10. In response to detection of a fired
blank, mechanical wave sensor 22 triggers both the laser
transmitter and the laser emitting optics package 30 to
respectively emit a laser and an ultrasonic pulse at the same time.
Unlike a laser pulse, the ultrasonic wavefront widens with
distance; thus, the ultrasonic pulse is detectable across the
entire target. Consequently, while the ultrasonic transmitter is
required to transmit ultrasonic pulses toward the target, it is not
necessary for the ultrasonic transmitter to be concentrically
arranged in the bore of the barrel or for the direction of the
ultrasonic pulse to be precisely aligned. In fact, the ultrasonic
transmitter need not be positioned within the barrel of the
training firearm. Of course, the use of an ultrasonic transmitter
is not limited to the training barrel embodiment of the invention,
and can also be used with the aforementioned laser-only training
firearm or a slide-in laser module in conjunction with the target
of the present invention.
[0098] As shown in FIG. 3, an ultrasonic detector 34 can be located
on the target adjacent the laser light detectors so as not to
interfere with detection of the laser pulse. Similarly, an
ultrasonic detector 48 can be positioned between targets on the 25
Meter Alternate C Course target shown in FIG. 4. While the
ultrasonic detector is preferably in the same plane and as close as
possible to the laser light detectors, the precise location of the
ultrasonic detector is not critical due to the relatively wide
beamwidth of the ultrasonic pulse and due to the fact the
ultrasonic pulse is used only to measure time/distance (and not X-Y
position).
[0099] Another technique for preventing cheating in accordance with
the present invention involves including encrypted information in
the laser pulse to confirm to the target that the training firearm
laser transmitter being "fired" is indeed authorized for the
competition. Serial number registration, such as that in common use
with electronic equipment, can be encoded in the laser pulse to
help ensure that the competitor shooting is in fact the person
registered for the event. Such registration information, could be
combined with novel developments in the field of fingerprint ID
firearm trigger locks to further control surrogate competitors.
[0100] Further, the local computer or network system can include
provisions for preventing cheating. For example, the computer can
display instructions for each competitor to fire at a particular
corner of the target in a random sequence determined by the
computer or at secondary targets placed at the periphery of the
primary target. Each competitor is required to aim and fire at the
target in accordance with instructions unknown in advance. Since
hitting the points in sequence requires some degree of rapid change
in the point of aim, the competitor is precluded from locking the
firearm down in a vice or rack to eliminate errors. Such an aim
point check could be introduced at any time in the competition, and
such a check can be implemented over a networked system.
[0101] In accordance with another aspect of the present invention,
the network also includes the ability to recognize artificial
results, such as an unnaturally accurate series of hits achieved by
placing the training firearm in a vice or other mechanical support
during the competition. Other measures for preventing cheating may
be incorporated into the system, including, but not limited to,
statistical sampling routines, records of a competitor's prior
performance, and historical records of the best performance in a
given event.
[0102] The firearm training system of the present invention is also
useful for closed-loop zeroing of sighted firearms. The training
firearm with the laser is mounted on a high-accuracy mandrel, is
aimed at the target, and an initial estimation is made of a point
of impact for a range of twenty-five meters or longer (i.e., the
aforementioned "boresighting" process). The shooter then fires a
group of simulated shots. Assuming the shot group meets the
criteria for zeroing (e.g., the hit points fall with a 4 cm
diameter circle), the computer determines the center of mass of the
shot group of detected laser pulses and reports the center of mass
information to the shooter (e.g., displayed on the computer screen
or printed). The sights are then adjusted to compensate for the 15
estimated offset between the aim point and the calculated center of
mass. Next, another simulated shot group is fired and center of
mass is again compared to the aim point in an iterative process
which is repeated until the aim point is at the center of the
target and within an acceptable offset, at which point the sights
are deemed zeroed.
[0103] In accordance with the present invention, the use of laser
pulses rather than projectiles in the zeroing process
advantageously conserves resources. Moreover, because the center of
mass calculation is performed by the computer, it is not necessary
to limit the size of the shot group to three, as is required with
live fire in order to accurately estimate the center of mass (and
to conserve resources). Larger shot groups provide a better
estimate of the offset of the sights than a three-shot group, which
may reduce the number of zeroing iterations required to acceptably
zero the firearm.
[0104] Having described preferred embodiments of a new laser-based
firearm training system, it is believed that other modifications,
variations and changes will be suggested to those skilled in the
art in view of the teachings set forth herein. It is therefore to
be understood that all such variations, modifications and changes
are believed to fall within the scope of the present invention as
defined by the appended claims.
* * * * *