U.S. patent number 3,626,094 [Application Number 04/789,740] was granted by the patent office on 1971-12-07 for message display system for television.
This patent grant is currently assigned to Electronic Systems Development, Inc.. Invention is credited to William A. Lee, Milton K. Widdekind.
United States Patent |
3,626,094 |
Widdekind , et al. |
December 7, 1971 |
MESSAGE DISPLAY SYSTEM FOR TELEVISION
Abstract
A camera having a lens is positioned so that the lens has a
predetermined line of view. An indexing unit is located at a
position remote from said camera and selectively positions a
plurality of cards into a position in which the cards on their
images are viewable by the lens. Each card bears a written message.
A clock or other viewable object is located remote from said
indexing unit and is positioned so that it or its image may be
viewed by said lens. In the preferred form the image from the cards
or the clock is selectively positioned in the line of view of the
lens by the selective rotation of a mirror. In modified forms the
clock is directly in the lens line of view and the cards are
selectively positioned into the lens line of view between the clock
and the lens. In one modified form the cards are carried in an
arcuate path about a horizontal axis whereas in the other modified
form the cards are carried about a vertical axis. A control unit
includes a system of various length tabs on the cards for breaking
a light beam to one of three photocells. The tab length determines
the length of time that a card is viewed and whether or not the
mirror is rotated.
Inventors: |
Widdekind; Milton K. (Seattle,
WA), Lee; William A. (Puyallup, WA) |
Assignee: |
Electronic Systems Development,
Inc. (Seattle, WA)
|
Family
ID: |
25148548 |
Appl.
No.: |
04/789,740 |
Filed: |
January 8, 1969 |
Current U.S.
Class: |
348/96; 40/465;
40/526; 348/E5.022 |
Current CPC
Class: |
H04N
5/222 (20130101) |
Current International
Class: |
H04N
5/222 (20060101); H04n 005/24 () |
Field of
Search: |
;178/7.88,7.89,6,7.2ST
;40/78.07,78.09,36,97,28C,52B |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Griffin; Robert L.
Assistant Examiner: Eckert, Jr.; Richard K.
Claims
What is claimed is:
1. A message display system for television or the like,
comprising:
a. a camera having a lens;
b. an indexing unit having a plurality of message holders
selectively and successively movable to a position in alignment
with said lens and movable to a position out of alignment with said
lens, said indexing unit including a horizontal platform, a
plurality of carriers for supporting said message holders pivotally
secured to said platform, and means for intermittently rotating
said platform;
c. a second viewable object aligned with said lens, said message
holders when aligned with said lens being between said lens and
said second viewable object, said message holders when not aligned
with said object leaving an unobstructed line of sight from said
lens to said second viewable object, and
d. control means for selectively moving each message holder into
such aligned position and out of aligned position to leave an
unobstructed view of the second viewable object, said control means
including actuating means for raising a carrier into said aligned
position.
2. The message display system defined by claim 1, wherein said
actuating means includes a cam pivotally mounted on a horizontal
pin, one end of said cam having a roller engageable with said
carrier and the other end having a roller engageable with a
motor-driven eccentric cam.
3. A message display system for television or the like,
comprising:
a. a camera having a lens;
b. an indexing unit having a plurality of message holders
selectively and successively movable to a position in alignment
with said lens and movable to a position out of alignment with said
lens, said indexing unit including a pair of spaced, opposed arms
rotatably mounted about a horizontal axis; a plurality of carriers
for supporting said message holders, each of said carriers having a
transverse rod; a clip rotatably mounted at each end of said arms
for securing and supporting said transverse rod of a carrier; means
for placing carrier in a supported position with said clips, means
for holding said clips in a constant vertical orientation, and
means for discharging said carriers from out of said clips after
leaving said position aligned with said lens;
c. a second viewable object aligned with said lens, said message
holders when aligned with said lens being between said lens and
said second viewable object, said message holders when not aligned
with said object leaving an unobstructed line of sight from said
lens to said second viewable object, and
d. control means for selectively moving each message holder into
such aligned position and out of aligned position to leave an
unobstructed view of the second viewable object.
4. The message display system defined by claim 3, wherein said
means for holding said clips in a constant vertical orientation
further includes a pair of inner sprockets fixed along said
horizontal axis, a pair of outer sprockets mounted for rotation
with said clips on adjacent ends of said opposed arms and a pair of
chains each entrained about said inner and outer sprockets.
5. The message display system defined by claim 4, wherein said
carriers each includes a second transverse rod and said indexing
unit further includes a stack holder having a pair of opposed
bottom support pins and a pair of short ledges for supporting a
carrier by its transverse rods.
6. A message display system for television or the like
comprising:
a. a camera having a predetermined line of view;
b. an indexing unit having a plurality of movable message holders
selectively presentable in a viewable position;
c. first moving means to move said message holders selectively to
said viewable position;
d. a stationary viewable object at a position angularly offset from
said indexing unit and out of said line of view;
e. reflective means in said line of view and selectively movable
into a first position wherein one of said movable message holders
in said viewable position is reflected into said line of view and a
second position whereby said stationary viewable object is
reflected into said line of view;
f. second moving means to move said reflective means between its
first and second positions; and
g. control means to cause sequential viewing of said message
holders and said stationary viewable object, said control means
comprising:
1. means for activating said second moving means to move said
reflective means from its first position to its second
position,
2. means for deactivating the second moving means so that the
reflective means remains in its second position to cause the
stationary viewable object to be reflected into the line of view of
the camera,
3. means for activating said first moving means to move a first
selected message holder of the indexing unit into its viewable
position after said reflective means has moved from its first
position,
4. means for deactivating said first moving means for a
predetermined delay period to hold said first message holder in its
viewable position during said delay period,
5. means for activating said second moving means at the initial
portion of said delay period to move said reflective means back to
its first position,
6. means for deactivating said second moving means for the duration
of said delay period whereby said first message holder remains in
the line of view of the camera during the delay period, and
7. means for recycling the control means (6) with respect to a
second message holder of the indexing unit; and
h. said control means further comprises:
1. a plurality of photo cells,
2. a light source to activate said photo cells, and,
3. a plurality of tab means, each mounted to respective message
holders, each of said tab means being arranged to cover selected
photo cells so as to determine the steps initiated by said control
means.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention pertains to information display systems for
television or the like.
2. Description of the Prior Art
There has been a need for a display system that is capable of
sequentially exhibiting before a television camera various data for
a particular class of viewers or the general public and
particularly for exhibiting this information in a closed circuit
television arrangement. One such apparatus is disclosed in the
commonly assigned, copending application of Richard N. Sherwin,
Ser. No. 617,574, filed Feb. 21, 1967, now U.S. Pat. No. 3,477,782,
granted Nov. 11, 1969. In this system various data are positioned
in the line of view of a TV camera by selectively illuminating one
of the various data. More specifically a one-way mirror is
positioned in the line of view of the lens and one information
display unit containing the data is positioned in the same line
behind the mirror. Another information display unit is positioned
at an angle, that is, offset, to the line of view of the camera.
The mirror is arranged so that when the first information display
unit is illuminated the data is viewed through the mirror whereas
when the offset information display unit is illuminated and the
aligned unit is darkened the illuminated data from the offset unit
is reflected by the mirror into the lens.
Prior to the above, the common practice for displaying desired
information in a closed circuit television system was to arrange
the various data in a line and then scan the line by intermittently
moving the camera. Undesirable consequences of moving the camera
are that the picture frequently is unsteady, the viewer is
subjected to the somewhat unpleasant view of the background behind
the data-bearing units, and an annoying movement of the data source
appears as the camera scans from one source to the next.
SUMMARY OF THE INVENTION
This invention pertains to a message display system of the type
disclosed in said aforementioned application. A feature of this
invention, however, is that it is much simpler in construction and
consequently less expensive to manufacture. Primarily it utilizes
the concepts of sequential display of numerous messages and
alternately viewing a second object, such as a clock, but makes the
selective transition from the messages to the second object by
mechanical means in a much less complicated manner. In its broadest
principle, the invention includes a camera having a lens with a
predetermined line of view. An indexing unit having first data,
such as a plurality of message holders, is positioned so that a
message holder or an image of the message holder may be placed in
the line of view. A second object, separate from the message
holders, is positioned so that it or its image may be positioned in
the line of view. Means are then provided for mechanically,
selectively positioning one of these objects or its image into the
lens line of view. In one form the selective positioning is done by
a simple mirror and in modified forms the second object is
positioned directly in the lens line of view and the first data is
selectively positioned between the second object and the lens.
In the preferred form the illuminating lights for both the first
and second objects or data are dimmed during movement of the mirror
to reduce the likelihood of the viewer observing the movement.
Another feature is the control system for determining the length of
time that the message holder or its image is to be in the line of
view. The control system also enables rendering inactive the mirror
for any particular message holder so that if desired a continuous
message may be displayed by sequentially positioning a series of
message holders into the line of view each message holder bearing a
portion of the continuous message.
BRIEF DESCRIPTION OF THE DRAWing
FIG. 1 is a schematic plan of the preferred form of the display
system embodying the principles of the invention.
FIG. 2 is a side elevation of the system shown in FIG. 1.
FIG. 3 is an isometric of a portion of the system shown in FIG.
1.
FIG. 3A is a schematic illustration of the various control
conditions of the system shown in FIG. 1.
FIG. 4 is a schematic side elevation of the modified form of the
invention of the type wherein the message holders are rotated about
a vertical axis.
FIG. 5 is a fragmentary plan of the modified form shown in FIG.
4.
FIG. 6 is a fragmentary side elevation showing a message holder in
a viewable position along the lens line of view.
FIG. 7 is a side elevation of still another modified form of the
invention of the type in which the message holders are rotated
about a vertical axis.
FIG. 8 is a plan of the modified form shown in FIG. 7.
FIG. 9 is a fragmentary side elevation of a portion of the system
of FIG. 7.
FIG. 10 is a fragmentary side elevation of another portion of the
system of FIG. 7.
FIG. 11 is a fragmentary end elevation of the portion of the system
shown in FIG. 9.
FIG. 12 is a diagrammatic illustration of the control circuitry of
the preferred form.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In general the system of FIGS. 1-3A and 12 comprises three major
components, namely, a stationary, conventional television camera 12
having a lens 14, and indexing unit 18 carrying a plurality of
first viewable objects, such as message holders 20 shown in FIG. 3,
and a second object 16, such as a clock. The clock 16 is
conventional and is stationary. As is readily understood, the lens
is capable of viewing an image along a predetermined line of view.
All of the components are mounted on a baseplate 21 which may be
fitted on a cabinet, not shown.
Arranged in the lens line of view is a conventional mirror 22
mounted on a conventional rotary solenoid 24. Upon receiving an
electrical signal, the solenoid will rotate the mirror a few
degrees such as between the solid and phantom line positions shown
in FIG. 1. When in the solid line position, the image received by
the lens 14 will be that of a message holder 20 whereas in the
phantom position the image received will be of the clock. Suitable
tubular lights 26, one above and one below the mirror 22, provide
illumination for the clock and the message holders. As is best
shown in the circuit diagram of FIG. 12, the lights 26 are dimmed
when the mirror is rotated so that the motion is not detected by
the camera.
The indexing unit 18 comprises a pair of base members 30 each
supporting a vertical side plate 32. The side plates are spaced
from one another, as best shown in FIG. 1, and support a plurality
of transverse shafts. A first transverse shaft 34 is secured in a
side plate and to a conventional indexing motor 36 of the type that
rotates a few degrees upon receiving an electrical signal. The
shaft 34 is connected by a chain and sprocket 38 to a second shaft
40. A pair of chains 42 are entrained about sprockets fixed to the
shaft 40 and also about sprockets fixed to a forward shaft 44. The
lower runs of the chains 42 proceed downwardly about a pair of
sprockets fixed on a lower shaft 46 and then upwardly about a pair
of sprockets fixed on a conventional takeup shaft 48. As best shown
in FIG. 2, the chains are intermittently indexed in the clockwise
direction as indicated by the arrow 49.
As best shown in FIG. 3, each of the message holders 20 are
removably mounted in a carrier 50. The carrier may be fabricated of
metal, heavy cardboard, plastic or the like. In the preferred form,
the carrier is molded of plastic and has lower and upper lips 52
and 54 respectively for slidably receiving the message holder 20.
In the preferred form, the message holder is a card that is easily
slipped into the lips 52 and 54 of the carrier. An abutment 56 is
provided at one end of the carrier to position the card in the
carrier and the card is held at the opposite end by a dimple 58.
The carrier is provided with a positioning tab 60 that depends from
its lower left-hand corner, as viewed in FIG. 3. The positioning
tab is adapted to slide between a spring biased clip 64 and a
vertical backing plate 65 that is secured to a forward end of the
indexing unit. As will be described below, the carrier is moved
past the clip 64 with the positioning tab 60 being pressed against
the backing plate by the clip so as to hold the carrier in a
vertical position while viewed by the lens 14.
Each of the carriers is provided with a transverse rod 66 that is
rigidly mounted in the upper lip member 54. The chains 42 are each
provided with a plurality of upright tongues 68 that are apertured
to rotatably receive the rods 66. The rods are centered between the
chains 22 and are secured against endwise movement by any suitable
means. As is best shown in FIG. 2, the carriers are freely
suspended between the chains during the lower course of travel and
are overlapped as they are carried upward around the shaft 40.
For the purpose of carrying the carriers along the horizontal path
at the top run of the chains, a horizontal plate 72 is provided
between the vertical side plates 32. The horizontal plate 72
carries a pair of spaced, horizontal tubular guides 74 that run
longitudinally of the indexing unit beneath the top run of each of
the chains 42. The tubular guides prevent the chains from sagging
and provide smooth guide surfaces for traversing the top of the
indexing unit.
The message holders are carried across the top of the indexing unit
face down and to the rear. It is therefore necessary to flip the
carriers over before being viewed by the camera. For this purpose,
each of the carriers is provided with a rounded cam surface 76
formed on the upper lip 54 of the carrier. A pin 78 is fixed to the
side plate 32 and engages the cam surface as the chains 42 index
the carriers to the right along the top of the indexing unit. The
cam surface rides up over the pin pivoting the carrier 50 and
flipping it over. After being flipped the lower lip 52 of the
carrier 50 engages a stop member 80. With the next sequence of the
motor 36 the carrier is lowered about the shaft 44, rides off the
stop member 80, and falls into the vertical position in line with
the mirror 22. When in the vertical position, the carrier is
further indexed beneath the clip 64 so that it is held while in the
position for viewing.
The sequence of flipping the carriers 50 is best illustrated by the
use of the letters A, B, C and D. In position A a carrier is being
engaged by the pin 78 and is about to be flipped into position B.
In position B the carrier is suspended by the stop member 80. In
position C the carrier is in the vertical position beneath the clip
64 so that the message holder image is projected on the mirror 22.
In position D the carrier has moved downwardly out of engagement
with the clip 64.
Each of the message holders 20 carries a decal or otherwise
removable surface having a message as indicated by the lines 82.
Each message holder is also provided with a control tab 84. The
control tabs 84, in conjunction with photocells and conventional
circuitry, determine the length of time that the carrier is held in
the viewing position C so that the message 82 may be viewed by the
lens 14. The control tabs also determine whether the rotary
solenoid 24 for rotating the mirror 22 should be deactivated. When
deactivated a plurality of carriers may be positioned in position C
without the mirror turning and thus without the image of the clock
being projected to the lens 14. For these purposes, three
photocells 85, 86 and 87 are secured to the sidewall 32 of the
indexing unit directly behind the tabs of a carrier when in
position C. A light source 88 is fastened to the baseplate 21 in a
position to shine a light into the photocells. When a carrier is in
position C, that is, its image is projectable into the mirror 22,
one or more of the photocells are screened from the light source by
the control tab 84. The system, as controlled by the control tabs
84, has five conditions which are regulated by the presence of a
control tab and the length of the control tab. As best shown in
FIG. 3A, the five conditions are as follows:
Condition I is with no control tab 84 to cover any of the
photocells 85, 86 or 87. This is the condition when no message
holder is in the carrier. In this condition the indexing motor
continues to rotate so as to bypass that carrier. The mirror will
remain in the phantom position shown in FIG. 2 so that the image of
the clock 16 is in the lens 14 and there will be no delay of the
carrier nor dimming of the lights as the carrier is carried through
position C. In Condition II, the shortest control tab 84 is shown
covering photocell 85. In this condition the normal sequencing of
the motor 36 takes place with a delay of 13 seconds while a carrier
is in position C. Prior to the 13 second delay, the mirror 22 is
rotated into the solid line position so that the image of the
message holder in position C is projected into the lens 14. At the
end of the 13 second delay the mirror is rotated back into the
phantom position to cast the image of the clock into the lens 14.
In condition III, two of the photocells are covered by a control
tab. In this condition the delay time is doubled to 26 seconds with
the sequencing of the indexing motor 36 and the position of the
mirror 22 being identical with the condition II. In condition IV
(long card condition), all three of the photocells are covered. In
this condition a 26 second delay takes place because photocell 86
is covered but the rotary solenoid to the mirror is deactivated so
that at the end of the 26 second delay the next carrier 50 is
positioned in position C without the image of the clock 16 being
projected into the lens 14. In this condition, a continuous message
requiring the entire space of several message holders 20 may be
displayed without the interruption of the clock 16. The image
displayed on the television screen will be of the message holder 20
bearing the first part of the continuous message, the viewer will
then see the second card being carried into position C where the
message will be continued and so on until the desired message is
completed. In condition V, the photocells 85 and 87 are covered but
a hole is placed in the tab in alignment with photocell 86. In this
condition a 13 second delay occurs but the rotary solenoid is
inactivated as in condition IV.
FIG. 12 is a diagrammatic illustration of the circuitry for
carrying out the controls illustrated in FIG. 3A. The circuitry may
readily be developed by one skilled in the art. For this reason the
details of the circuit will not be described.
In FIGS. 4, 5, and 6 a modified form of the display system is
illustrated. In this form the message holders 100 are removably
held in carriers 101 that are pivotally mounted by a pin 102 on a
horizontal platform 104. The horizontal platform is rotatably
mounted on a post 106 and is rotated by an indexing motor 108
similar to the indexing motor 36 of the preferred embodiment. A
circular flange 110 is secured to the underside of the horizontal
plate and is engaged by a rubber roller 112 that is secured to the
rotary shaft of the indexing motor 108. A clock 114 is positioned
directly in the line of view of the lens 116 of a camera 118. The
clock, lens and camera are above the plane of the message holders
100 when suspended from the horizontal platform 104. In order to
bring a message holder into view of the lens, it is necessary to
raise it as shown in solid lines in FIG. 6. In this position the
message holder is between the clock and the camera so that the
selective viewing of the clock and message holders are controlled
merely by raising the carrier 101. In order to raise the carrier
101 and thus the message holder 100 into the upper position as
shown in FIG. 6, a cam 120 having a roller 122 is pivoted for
oscillation about a horizontal pin 124. The cam 120 has an
actuating end with a roller 126 that is engaged by an eccentric cam
128 rotated by a motor 130. When a carrier 101 is in a position in
alignment with the roller 122 the rotation of the horizontal
platform 104 is stopped and the motor 130 is energized to move the
cam 120 in a clockwise direction. The roller 122 then pushes
against the underside of the carrier 101 raising it into the
position shown in FIG. 6. After the desired delay time, such as 13
or 26 seconds as in the preferred embodiment, the motor 130 is
again energized lowering the cam and the carrier into the position
shown in FIG. 4. At this time the clock will be in the lens line of
view and the horizontal platform 104 is again indexed by the
indexing motor 108 to bring the next carrier and message holder
into position to be raised.
In the modification shown in FIGS. 7-11, the principle of
interposing the message holder between the lens and clock is again
employed; however, the message holders are moved about a horizontal
axis rather than about a vertical axis. A clock 140 is positioned
directly in line with the lens 142 of camera 144 and thus will be
viewed by the camera except in those conditions when a message
holder is interposed between the lens and the clock. The indexing
unit 146 of this modification includes a pair of spaced frame
plates 148. Rotatably mounted in the plates is a shaft 150 that is
rotated by an indexing motor 152 similar to the indexing motor 36
of the preferred embodiment. A pair of spaced arms 154 are keyed to
the shaft 150 for rotation therewith. Each of the arms rotatably
mounts a pin 158 at either end. A retaining clip 156 is secured to
each pin. The free end of each pin 158 is secured to a sprocket
160. A chain 162 is entrained about the sprocket 160 and about an
idler sprocket 164 that is fixed relative to the vertical plates
148. A parallelogram linkage is thus established such that upon
rotation of the arms 154 the clips will be moved in a circular path
but their orientation will be unchanged due to the connection with
the chains 162.
As best shown in FIGS. 9 and 10, each clip includes a pickup
surface 164, a V or valley 166, and a discharge surface 168. The
discharge and pickup surfaces are employed to replace and remove
the carriers 170 from a stack indicated generally by the reference
character 172. The carriers 170 are generally identical to the
carriers 50 of the preferred embodiment and include a message
holder 172 and a transverse rod 174. A second transverse rod 175 is
added to the lower end of each carrier. The message holders are
stored in the stack 172 with the written message in the upper
position. As the arms make their circular traverse, the clips 156
are brought into line with the transverse rods 174 of the lowermost
carrier 170 in the stack. As is best shown in FIG. 10, the carriers
are supported in the stack by a pair of spaced bolts 176 and small
spaced ledges 178. As the arms are rotated the pickup surfaces 164
of the pair of clips 156 engage the upper transverse rod 174 of the
lowermost carrier 170 in the stack. As the arms continue the pickup
surfaces push the carrier off the bolts 176 and the small ledges
178 so that the carrier falls into the V's 166 in the vertical
position as shown in phantom lines in FIG. 7.
The sequence is best illustrated with letters A-E. In position A
the carriers are in the stack 172. In position B a carrier is
removed and is hanging in the vertical position. When the motor 148
is again indexed, the arms are raised so that the carrier is moved
into a position C in line of view of the lens 142. The arms then
progress to a position D and the clock 140 is again in the lens
line of view. In position E the carrier 170 is again placed on the
stack 172. This is accomplished by a pair of spaced, pointed ears
180 engaging the tops of the carrier to cause the transverse rod
174 to ride up on the discharge surfaces 168 of the clips 156 as
the clips are moved in their arcuate paths. Further movement will
release the support rods 174 and the carrier is then dropped into
the stack and the clips are moved downwardly to the position to
pick up the lowermost carrier of the stack.
While several modifications of the invention have been illustrated,
the invention is not to be construed as limited to the particular
forms disclosed herein, since these are to be regarded as
illustrative rather than restrictive.
* * * * *