U.S. patent number 3,786,182 [Application Number 05/150,663] was granted by the patent office on 1974-01-15 for frame-by-frame video image recording apparatus.
This patent grant is currently assigned to Matsushita Electric Industrial Company, Limited. Invention is credited to Masahiko Kaneko, Hiroshi Miyama, Jun Nishida.
United States Patent |
3,786,182 |
Kaneko , et al. |
January 15, 1974 |
FRAME-BY-FRAME VIDEO IMAGE RECORDING APPARATUS
Abstract
A recording apparatus for recording a video image on a recording
medium comprises a recording mechanism including a cathode-ray tube
and pressure means for pressing the recording medium against a
faceplate of the cathode-ray tube, and an electronic control means
for controlling the recording mechanism. The control means includes
a single-frame gate means adapted to be started by a start switch
thereby energizing the cathode-ray tube to reproduce the video
image on a desired single-frame, and feed means governed by the
start switch for actuating a feeding element of the recording
mechanism so as to effect timely feeding of the recording medium.
This recording apparatus thus recording a video image signal
frame-by-frame as above-described, the feeding rate of the
recording medium need not be synchronized with the sweeping rate of
a flying-spot on the faceplate.
Inventors: |
Kaneko; Masahiko (Kadoma,
JA), Miyama; Hiroshi (Kadoma, JA), Nishida;
Jun (Kadoma, JA) |
Assignee: |
Matsushita Electric Industrial
Company, Limited (Osaka, JA)
|
Family
ID: |
27582003 |
Appl.
No.: |
05/150,663 |
Filed: |
June 7, 1971 |
Foreign Application Priority Data
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|
|
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Jun 9, 1970 [JA] |
|
|
45-50084 |
Jul 17, 1970 [JA] |
|
|
45-62981 |
Jul 17, 1970 [JA] |
|
|
45-62982 |
Jul 22, 1970 [JA] |
|
|
45-64531 |
Jul 23, 1970 [JA] |
|
|
45-65300 |
Aug 7, 1970 [JA] |
|
|
45-69452 |
Aug 19, 1970 [JA] |
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45-70379 |
Oct 6, 1970 [JA] |
|
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45-88568 |
Jun 23, 1970 [JA] |
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45-62992[U]JA |
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Current U.S.
Class: |
386/201; 386/241;
386/326; 355/18; 347/226 |
Current CPC
Class: |
H04N
1/00602 (20130101); H04N 1/393 (20130101); H04N
1/00591 (20130101); H04N 1/0057 (20130101); H04N
1/00668 (20130101); H04N 1/1004 (20130101) |
Current International
Class: |
H04N
1/00 (20060101); H04N 1/393 (20060101); H04N
1/10 (20060101); H04n 005/86 () |
Field of
Search: |
;178/6.6R,6.7R,6.7A,6.6P
;346/74CR,74E,74ES,11V,11R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Konick; Bernard
Assistant Examiner: Hecker; Stuart
Attorney, Agent or Firm: Burns; Robert E. Lobato; Emmanuel
J.
Claims
What is claimed is:
1. A video image recording system for selectively recording one or
more video images comprising: means receptive in use of video
signals having synchronizing pulse signals each signal
corresponding in time to a discrete frame comprising a plurality of
fields and in which a video image is to be displayed: separating
means for separating said synchronizing pulse signals from said
video signals; a display device for displaying a video image in
said discrete frame when enabled comprising means receptive of said
video signals for converting said video signals to video images;
start switch means for selectively generating a start signal when a
selected video image is to be recorded; single-frame gate means
receptive of said synchronizing pulse signals and responsive to
said start signal for enabling displaying of said selected video
image in said discrete frame on said display device; and recording
means for recording all of said plurality of fields of said
discrete frame of said selected video image displayed on said
display device including feed means for feeding a recording medium
when enabled and feed control means receptive of said start signal
for enabling said feed means after all of said plurality of fields
of said discrete frame of said selected video image have been
recorded.
2. A video image recording system according to claim 1, wherein
said single-frame gate means comprises means co-active with said
feed control means thereby to record successive video images on
successive discrete frames on said recording medium.
3. A video image recording system according to claim 1, wherein
said single-frame gate means comprises a one-half-frequency divider
receptive of said synchronizing pulse signals for producing pulse
signals having a repetition frequency one-half that of said
synchronizing pulse signals, a monostable multivibrator receptive
of said start signal from said start switch means for producing a
trigger signal having a pre-selected pulse width, an AND gate
connected to said one-half-frequency divider and said monostable
multivibrator for passing said pulse signal from said
one-half-frequency divider therethrough when supplied with said
start signal from said monostable multivibrator, a flip-flop
connected to said AND gate and said one-half-frequency divider for
producing a single-frame pulse signal having a pulse width equal to
a duration between the leading edges of said pulse passed through
said AND gate and a succeeding pulse of said pulse passed through
said AND gate, a driver gate receptive of said single-frame pulse
signal from said flip-flop for producing a drive signal having a
pulse width equal to that of said single-frame pulse signal, gate
means receptive of said drive signal from said driver gate and a
voltage source connected to said gate means for applying a voltage
signal therethrough when said gate means receives said drive
signal.
4. A video image recording system according to claim 1, wherein
said feed control means comprises a d.c. power source having a
positive and a negative terminal, a first relay timing circuit
including a first resistor connected at one terminal to said
positive terminal of said d.c. power source, a first capacitor, a
first relay coil having a normally-closed contact pair and a
normally-open contract pair and having one terminal of the first
coil connected through said first capacitor to the other terminal
of said first resistor and the other terminal of said first coil
connected to said negative terminal of said power source, a first
diode shunting said first relay coil and forward-directed from said
one terminal to said other terminal of said first coil, and a
normally-open switch connected to said other terminal of said first
resistor and said negative terminal discharging said first
capacitor therethrough when actuated by said start signal from said
start switch means; a second relay timing circuit including a
second resistor connected at one terminal to said positive
terminal, a second capacitor, a second relay coil having four
normally-open contact pairs and having one terminal connected
through said second capacitor to the other terminal of said second
resistor and the other terminal connected to said negative
terminal, a second diode shunting said second coil and
forward-directed from said one terminal to said other terminal of
said second coil, and said normally-open contact-pairs associated
with said first coil and one normally-open contact pair of said
second coil both connected between the other terminal of said
second resistor and said negative terminal for discharging said
second capacitor therethrough when closed; a third relay timing
circuit including a third resistor connected at one terminal to
said positive terminal, a third capacitor, a third relay coil
having a normally-open contact pair and having one terminal
connected through said third capacitor to the other terminal of
said third resistor and the other terminal connected to said
negative terminal, a third diode shunting said third coil and
forward-directed from said one terminal to said other terminal of
said third coil, and the second normally-open contact-pair
associated with said second coil and said normally-open
contact-pair associated with said third coil both connected between
said other terminal of said third resistor and said negative
terminal for discharging said third capacitor therethrough when
closed; a fourth relay timing circuit including a fourth relay coil
having a normally-open contact-pair, one terminal of said fourth
relay coil being connected to said positive terminal through a
parallel connection of said normally-open contact-pair of said
fourth coil and a series connection of the third normally-open
contact-pair associated with said second coil and said
normally-closed contact-pair associated with said first coil, and
the other terminal of said fourth relay coil being connected to
said negative terminal through a parallel connection of the fourth
normally-open contact-pair associated with said second coil and
switch means for opening in response to said recording medium being
fed a predetermined length, and said normally-open contact-pair
associated with said fourth relay coil and connected to said
positive terminal for producing an output voltage signal when said
fourth coil is energized.
5. A video image recording system according to claim 1, further
comprising a normally-open switch connected in parallel with said
single frame gate means by-passing said gate means.
Description
The invention relates to a recording apparatus and more
particularly to a recording apparatus utilizing a cathode-ray tube,
in which a radiation sensitive recording medium is placed on a
faceplate of the cathode-ray tube for recording a video image
reproduced thereon.
It is desired to record on a suitable medium a video image
reproduced on a faceplate of a picture tube of a television
receiver. A difficulty is experienced in timely and appropriately
recording such a video image because the video image is drawn by a
high speed flying-spot produced in a manner that an electron beam
modulated and detected by a video image signal carrying the video
image is bombarded onto a phosphorous surface of the faceplate.
This makes it practically impossible to use a usual camera for such
recording purposes. An oscillographic recorder has been recently
developed which uses a fiber optics cathode-ray tube for
continuously recording high frequency signals for recording the
video image. A problem is still encountered in regulating the
feeding rate of the recording medium in order to synchronize it
with the sweeping rate of the flying-spot. Furthermore, the
recorder of the type to continuously record a video image is
disadvantageous in that, where a video image is to be reproduced by
interlaced scanning, the video image is recorded by "field" but not
by "frame", failing to provide a satisfactory resoluting power.
It is therefore a primary object of this invention to provide an
improved video image recording apparatus which can timely and
appropriately record a video image with a satisfactory
resolution.
It is another object of this invention to provide an improved video
image recording apparatus which records a video image in a
"frame-by-frame" fashion.
It is a further object of this invention to provide an improved
video image recording apparatus which can record a TV video signal
on a recording medium by a selected frame.
It is a still further object of this invention to provide a video
image recording apparatus which can selectively record either
positive or negative video image.
It is a further object of this invention to provide a video image
recorder which can selectively record either normal or horizontally
inverted video image on a recording medium.
It is a still further object of this invention to provide a video
image recording apparatus which can record an enlarged video image
on a recording medium.
The recording apparatus according to this invention utilizes a
cathode-ray tube preferably having a fiber optics faceplate the
inner surface of which is coated with a phosphorous material. A
video image signal source is provided which produces a video image
signal mixed with a synchronizing pulse signal. The video image
signal is applied to a separator for separating the synchronizing
pulse signal from the video image signal. The thus separated
synchronizing pulse signal is applied to a deflection signal
generating means which produces deflection signals to be applied to
the cathode-ray tube so as to vertically and horizontally deflect
an electron beam generated therein. The synchronizing pulse signal
is also applied to a single-frame gate which permits the
cathode-ray tube to reproduce a desired frame of video image while
being manually or automatically controlled. A recording medium
sensitive to radiation is pressed against the faceplate by a
suitable means thereby positioning and fixing the medium to receive
the radiation from the video image reproduced on the faceplate
whereby the video image is recorded on the recording medium in a
frame-by-frame manner. It is apparent that the above-mentioned
recording system of this invention is free from the necessity of
synchronizing the sweeping rate of the electron beam and the
feeding rate of the recording medium and need not "skew
correction".
In the drawings:
FIG. 1 is a perspective view of a video image recording apparatus
according to this invention;
FIG. 2 is a rear end view of the apparatus with its back-board
taken away;
FIG. 3 is schematic cut-away view of a recording mechanism of the
recording apparatus of FIGS. 1 and 2;
FIG. 4 is a schematic block diagram of a control circuit for the
recording mechanism shown in FIG. 3;
FIG. 5 is a block diagram of a preferred form of a single-frame
gate used in the control circuit of FIG. 4;
FIG. 6 is a diagram showing waveforms appearing in the single-frame
gate of FIG. 5;
FIG. 7 is a preferred circuit arrangement of a motor control means
in the control circuit of FIG. 4;
FIG. 8 is a diagram showing waveforms appearing in the circuit of
FIG. 7;
FIG. 9 is another form of the control circuit for the recording
mechanism of FIG. 3;
FIG. 10 is a block diagram of a video amplifier forming part of the
circuit of FIG. 9;
FIG. 11 is a front view of a faceplate of a cathode-ray tube of the
apparatus using the circuit of FIG. 9;
FIGS. 12 to 15 are block diagrams of other forms of the control
circuit for the recording mechanism;
FIG. 16 is a front view of the faceplate of the cathode-ray tube
showing an enlarged reproduction of a video image signal; and
FIGS. 17 and 18 are block diagrams of still other forms of the
control circuit for the recording mechanism.
In FIG. 1, a preferred embodiment of a recording system or
apparatus according to this invention, shown at 10, is housed
within a cabinet 11. This recording apparatus 10 has as a monitor
tube TV picture tube having a faceplate 12 which is exposed to the
outside through an opening 13 provided in a front wall of the
cabinet. A recording mechanism including a cathode-ray tube is
positioned at a suitable portion within the cabinet 11. In a
suitable portion of the front wall are placed a plurality of
controls 14 to 17 for controlling astigmatism, sweep timing,
intensity and focus, horizontal and vertical positions, for
instance, of the picture tube and the cathode-ray tube. An aperture
18 is formed in the front wall of the cabinet 10 through which a
recording medium 19 recorded by the recording mechanism is
delivered as shown.
FIG. 2 shows a rear side of the recording apparatus 10 with a
protection board taken away. The recording mechanism indicated by
20 is positioned sidewise of the picture tube 21. An electronic
control means covered by suitable member 22 for controlling the
recording mechanism is provided at a lower portion of the cabinet
11.
FIG. 3 shows in more detail the recording mechanism 20 housed in a
frame structure 30. This mechanism comprises a recording
cathode-ray tube 31 having a display device such as a fiber optics
faceplate 32. This cathode-ray tube 31 is fastened onto the inner
surface of the frame structure 30 through a supporting member 33. A
pressure pad 34 is provided in a manner to face the faceplate 32 of
the cathode-ray tube 31 for pressing against the faceplate a
recording medium 35 on which a video image should be recorded. On
one side surface of the pressure pad 34 facing the faceplate 32 is
provided a suitable member 36 such as a plurality of stiff bristles
for the purpose of protecting the recording medium 35. The pressure
pad 34 is connected at the other side surface to a substantially
cylindrical rod 37 which is slidably coupled with a hollow
cylindrical member 38 fixed to a supporting rod 39. This supporting
rod 39 is mounted on the frame structure 30 through suitable means
such as screws. A coil spring 40 is provided surrounding the
cylindrical rod 37 and seated on the pressure pad 34 and the hollow
cylindrical member 38 for applying through the pressure pad 34 to
the recording medium 35 a suitable pressure toward the faceplate
32. The area of the side surface of the pressure pad 34 may
preferably be greater than that of the faceplate 32 of recording
cathode-ray tube 31. The recording medium 35 is sensitive to a
radiation from a video image produced on the faceplate. In the
present embodiment, the recording medium 35 is provided in the form
of a paper roll 41 and fed through a guide member 42 and a pair of
idler rollers 43 and 43', thereby being passed between the
faceplate 32 and the pressure pad 34.
The recording medium 35 passed between the faceplate 32 and the
pressure pad 34 is passed between a pair of drive rollers 44 and
44' which are driven by suitable means such as an electrical motor
(not shown) thereby feeding the recording medium 35 as desired. The
recording medium 35 thus passed between the drive rollers 44 and
44' is then fed through a guide member 45 to a processor 46 for
developing and fixing the video image recorded thereon. The thus
processed recording medium 35 is then delivered to the outside
through an aperture 47 formed in the frame structure 30 preferably
via a roller 48 for being turned upside down for convenience in
visual observation.
FIG. 4 shows a preferred circuit arrangement of the control means
for the recording apparatus shown in FIGS. 1, 2 and 3. This circuit
arrangement comprises a usual tuner 50 for a TV video signal which
selectively receives a TV video signal through a suitable means
such as an antenna. The video image signal selected by the tuner 50
is applied through a line 51 to a high frequency amplifier 52. The
amplified video image signal from the amplifier 52 is applied
through a line 53 to a detector 54 for detecting the video signal
therein. The thus detected video signal is applied through a line
55 to a video amplifier 56. The video signal from the amplifier 56
is applied through a line 57 to a first grid, for example, of a
display device such as the cathode-ray tube 31.
In this instance, it should be noted that any video image signals
other than the TV video signal, are available for the particular
recording apparatus if these signals have synchronizing signal
components.
To an anode of the recording cathode-ray tube is applied a high
voltage from a high voltage source (not shown) so as to accelerate
an electron beam emitted from an electron gun (not shown) toward
the faceplate. This electron beam is intensity-modulated by the
video image signal applied thereto.
The output video image signal from the video amplifier is also
applied through a line 58 to the picture tube 12 which reproduces
the same video image as that reproduced on the cathode-ray tube 32.
The video image reproduced on the faceplate of the picture tube 12
is visually observed for selecting a suitable video image and
appropriately controlling the cathode-ray tube 31. The output
signal from the video amplifier 56 is further applied through a
line 59 to separating means including a separator 60 which
separates the synchronizing signal from the output video image
signal. The thus separated synchronizing signal including
horizontal and vertical synchronizing pulses is applied through a
line 61 to a first deflector 62 and through a line 63 to a second
deflector 64. These deflectors 62 and 64 produce vertical and
horizontal deflection signals in accordance with the synchronizing
signal. The deflection signals are applied to deflecting coils 65
and 66 of both of the tubes 31 and 12, respectively, so as to
vertically and horizontally deflect the electron beams to reproduce
on the faceplates the video image carried by the image signal
applied through lines 57 and 58, respectively.
The vertical synchronizing signal, on the other hand, is applied
through a line 67 to a single-frame gate controller 68 which
produces a single-frame gate signal in accordance with the
horizontal synchronizing signal only when it receives a start
signal through a line 69 from a start switch 70. This single-frame
gate signal is used for actuating an ON-OFF gate 71 provided
between a d.c. voltage source 72 and a second grid, for example, of
the cathode-ray tube 31. This ON-OFF gate 71 then closes its own
circuit so as to supply a voltage from the source 72 through lines
73 and 74, to the second grid thereby to raise the potential of the
second grid. As the potential of the second grid is raised, the
electron beam is substantially permitted to pass through the second
grid whereby a selected frame of a video image is reproduced on the
faceplate 32 of the recording cathode-ray tube 31. On the other
hand, the voltage from the source 72 is constantly applied through
a line 75 to the picture tube 12 so as to constantly reproduce the
video image carried by the video image signal for providing
pertinently controlled contrast, intensity, focus, etc. of the
video image to be recorded. A neon lamp 76 is provided, which is
connected at one terminal to the line 74 and is grounded at the
other terminal and glows when the gate 71 remains closed thereby to
indicate the moment at which the video image is recorded.
The start switch 71 is manually or automatically operated so as to
produce a start signal, which is applied through the line 69 to the
single-frame gate controller 68 and through a line 77 to the feed
motor controller 78 thereby starting them. The feed motor
controller 78 produces a drive signal upon termination of a time
duration sufficiently longer than the pulse width of the gate
signal produced by the single-frame gate after the start signal has
triggered the motor controller 78. The drive signal is applied
through a line 79 to a feed motor actuator 80 which then actuates a
feed motor to exert a feeding force on the drive rollers or other
feeding elements of the recording mechanism 20 shown in FIG. 3.
If desired, the single-frame gate controller 68 and the motor
controller 78 may be arranged to co-operate with each other so as
to permit of repeated recording operation of the recording
mechanism 20.
The fiber optics cathode-ray tube may be replaced with other types
of cathode-ray tube such as a cathode-ray pin tube, if
preferred.
FIG. 5 shows a preferred form of the single-frame gate controller
68 of FIG. 4, which comprises a one-half-frequency divider 90
connected to the separator 60. One output terminal of the divider
90 is connected through a line 91 to one input terminal of an AND
gate 92 and the other output terminal connected through a line 93
to a set terminal of a flip-flop 94. To the other terminal of the
AND gate 94 through a line 95 is connected a monostable
multivibrator 96 having an input terminal which is connected to the
start switch 70. An output terminal of the AND gate is connected
through a line 97 to a reset terminal of the flip-flop 94 having an
output terminal which is connected through a line 98 to a driver
99. The driver 99 is adapted to produce a drive signal of a current
great enough to energize the ON-OFF gate 71. This ON-OFF gate 71
may be a suitable switching device such as a relay or a
transistor.
FIG. 6 shows the operation of the single-frame gate controller of
FIG. 5.
When a video image signal containing the synchronizing signal is
received as shown at (a), the separator 70 separates the horizontal
synchronizing pulse signal from the video image signal as shown at
(b). This synchronizing pulse train is applied to the
one-half-divider 90 which produces an output pulse signal having a
repetition frequency one half lower than that of the input
synchronizing pulse train, which output pulse signal is shown at
(c). This output pulse signal is applied through the line 91 to the
one terminal of the AND gate 92 and also applied through the line
93 to the reset terminal of the flip-flop 94. In this instance,
when the start switch 70 is actuated, the switch 70 produces a
start signal which is applied to the monostable multivibrator 96
whereby producing a pulse signal as shown at (d). The pulse signal
shown at (d) is applied through the line 95 to the other terminal
of the AND gate 92, whereby one pulse indicated by A in the pulse
train (c) which happens to appear on the line 91 during the pulse
signal shown at (d) is permitted to pass through the AND gate 92
and then appears on the line 97 as shown at (e). This pulse A now
having appeared on the line 97 triggers the flip-flop 94 to change
its state. Thereafter, the pulse indicated by B next to the pulse
indicated by A is applied through the line 94 to the reset terminal
thereby to return the flip-flop 94 so that a pulse signal shown at
(f) having a pulse width equal to the pulse duration between the
pulses A and B appears on the line 98 and is applied to the driver
gate 99. The driver gate 99 which is supplied with this pulse
signal acts to close the gate 71 so as to permit the voltage from
the power source 72 to be impressed on the second grid of the
cathode-ray tube 31.
A preferred circuit arrangement of the motor controller 78 of FIG.
4 is shown in FIG. 7. This circuit arrangement comprises a d.c.
power source having positive and negative terminals respectively
connected to positive and negative bus lines 111 and 112. To the
positive bus line 111 is connected through a line 113 one terminal
of a resistor R.sub.1 the other terminal of which is connected
through a line 114 to one terminal of a capacitor C.sub.1. The
other terminal of the capacitor C.sub.1 is connected through a line
115 to one terminal of a relay coil TM1 the other terminal of which
is connected through a line 116 to the negative bus line 112. The
other terminal of the capacitor C.sub.1 is also connected through a
line 117 to an anode terminal of a diode D.sub.1 the cathode
terminal of which is connected through a line 118 to the negative
bus line 112. The other terminal of the resistor R.sub.1 is also
connected through a line 119 to a movable contact st..sub.s of a
start switch ST which is actuated by the start signal from the
start switch 70. A make contact st..sub.m of the start switch ST is
connected through a line 120 to the negative bus line 112.
To the positive bus line 111 through a line 121 one terminal of a
second resistor R.sub.2 the other terminal of which is connected
through a line 122 to one terminal of a capacitor C.sub.2. The
other terminal of the capacitor C.sub.2 is connected through a line
123 to one terminal of a second relay coil TM2 the other terminal
of which is connected through a line 124 to the negative bus line
112. The other terminal of the capacitor C.sub.2 is also connected
through a line 125 to an anode terminal of a second diode D.sub.2
the cathode terminal of which is connected through a line 126 to
the negative bus line 112. The other terminal of the resistor
R.sub.2 is also connected through lines 127 and 128 to movable
contacts tm1..sub.1s and tm2..sub.1s of relays TM1 and TM2. Make
contacts tm1..sub.1m and tm2..sub.1m respectively corresponding to
the movable contacts tm1..sub.1s and tm2..sub.1s are connected
through lines 129 and 130 to the negative bus line 112.
To the positive bus line 111 through a line 131 is connected one
terminal of a resistor R.sub.3 the other terminal of which is
connected through a line 132 to one terminal of a third capacitor
C.sub.3. The other terminal of the capacitor C.sub.3 is connected
through a line 133 to one terminal of a relay coil TM3 the other
terminal of which is connected through a line 134 to the negative
bus line 112. The other terminal of the capacitor C.sub.3 is also
connected through a line 135 to an anode terminal of a diode
D.sub.3 the cathode terminal of which is connected through a line
136 to the negative bus line 112. The other terminal of the
resistor R.sub.3 is connected through lines 127 and 128 to movable
contacts tm1..sub.2s and tm3..sub.1s of relays TM1 and TM3. Make
contacts tm1..sub.2m and tm3..sub.1m respectively corresponding to
the stationary contacts tm1..sub.2s and tm3..sub.1s are connected
through lines 139 and 140 to the negative bus line 112.
One terminal of a relay coil CT is connected through a line 141 to
a make contact tm3..sub.2m associated with the relay coil TM3 and
through a line 142 to a make contact ct..sub.1m. A movable contact
tm3..sub.2s is connected through a line 143 to a break contact
tm2..sub.2b. A stationary contact tm2..sub.2s is connected through
a line 144 to a movable contact ct..sub.1s and through a line 145
to the positive bus line 111. The other terminal of the relay coil
TM3 is connected through a line 146 to a make contact tm3..sub.3m
and through a line 147 to a break contact of a switch SP which is
actuated by a suitable means when the recording medium is
sufficiently fed. Movable contacts tm3..sub.3s and sp..sub.s are
connected through lines 148 and 149 to the negative bus line
112.
An output terminal 150 through which the drive signal is applied to
the motor actuator 80 is provided, which is connected through a
line 151 to a second make contact ct..sub.2m of the relay coil CT.
A movable contact ct..sub.2s is connected through a line 152 to the
positive bus line 111.
With reference to FIG. 8, the operation of the circuit of FIG. 7 is
described herebelow.
FIG. 8 shows operations of the start switch ST, relay TM1, TM2,
TM3, CT, and switch SP of the circuit of FIG. 7 in terms of
time.
When the start switch ST is opened, a current flows from the
positive bus line 111, resistor R.sub.1, capacitor C.sub.1, and
diode D.sub.1 to the negative bus line 112 until the capacitor
C.sub.1 is fully charged. The capacitors C.sub.2 and C.sub.3, on
the other hand, are fully charged in similar manners.
When the start switch ST is actuated to close at a time T.sub.1 as
shown at (a), the charge stored in the capacitor C.sub.1 is
discharged through the start switch ST, and relay coil TM1, so that
the relay coil TM1 is energized by the discharge current during a
time period T.sub.1 and T.sub.2 as shown at (b). Now that the relay
TM1 is actuated, the contacts t1..sub.1m are connected so that the
charge stored in the capacitor C.sub.2 is discharged through the
contacts t1..sub.1s and t1..sub.1m and the relay coil TM2 whereby
the relay coil TM2 is energized by the discharge current
therethrough during a time period T.sub.1 to T.sub.3 as shown at
(c). The time period is established by selecting the capacitance of
the capacitor C.sub.2 so as to be sufficiently larger than the time
period of the single-frame. The contacts tm1..sub.2s and
tm1..sub.2m are also connected so that the charge stored in the
capacitor C.sub.3 is discharged through the contacts tm1..sub.2s
and tm1..sub.2m whereby the relay coil TM3 is energized by the
discharge current during a time period from T.sub.1 to TM4 as shown
at (d). The time period is established to be larger than the time
period T.sub.1 to T.sub.3 and the time period from T.sub.3 to
T.sub.4 is large enough to actuate the relay CT. At the time
T.sub.3, the relay TM2 is inoperative but the relay TM3 maintains
operative so that a current flows from the positive bus line 111
through the contacts tm2.sup.1 and tm3.sup.2, the coil CT and the
parallel connection SP and tm3.sup.3 to the negative bus line 112
whereby the relay CT is operated as shown at (e). Therefore, a
positive voltage signal through the contacts ct.sup.2 appears at
the terminal 150 and is applied to the motor actuator 80 thereby to
actuate the feed motor. When the recording medium is sufficiently
fed, for example, at a time T.sub.5, the stop switch SP is operated
to open the contacts SP and de-energize the relay CT since the
relay TM3 has been released to open the contacts t3.sup.3.
FIG. 9 shows a modified form of the circuit arrangement of FIG. 4
wherein the video amplifier 56 is replaced with a amplifier 56'
having terminals 160 and 161 through one terminal 160 of which a
normal image signal having the same polarity as the original signal
introduced through the detector appears and through the other
terminal 161 an inverted image signal having a reverse polarity
relative to the normal image signal appears. The two terminals 160
and 161 are connected to break and make contacts 162 and 163 of a
change-over switch 164. A movable contact 165 of the switch 164 is
connected through a line 57 to a fiber optics cathode-ray tube 31.
The other elements of this circuit are connected with one another
as in the circuit of FIG. 4.
In operation, when the switch 164 is not actuated and the contacts
162 and 165 are connected with each other, the normal image signal
is applied through the line 57 to the cathode-ray tube 31 so that a
normal video image is reproduced on the faceplate 32. When the
switch 164 is actuated and the contacts 163 and 165 are connected
to each other, the inverted signal is applied to the cathode-ray
tube 31 so that an inverted image is reproduced on the faceplate
32.
FIG. 10 shows a preferred form of the video amplifier 56' of FIG.
9, which comprises an input amplifier 170 adapted to amplify a
video image signal applied thereto through the line 55. The output
terminal of the input amplifier 170 is connected through a line 171
to an inverter 172 which inverts the voltage porality of its input
signal.
One output terminal of the inverter 172 is connected through a line
173 to a separator 174 which separates a synchronizing signal from
its input signal. Two output terminals of the separator 174 are
respectively connected through lines 175 and 176 to horizontal and
vertical separators 177 and 178 which respectively separate
horizontal and vertical synchronizing pulse signals. Output
terminals of the horizontal and vertical separator are respectively
connected through lines 179 and 180 to horizontal and vertical
blanking pulse generators 181 and 182 the output terminals of which
are respectively connected through lines 183 and 184 to input
terminals of a first mixer 185. Two output terminals of the first
mixer 185 are respectively connected through lines 186 and 187 to
input terminals of second and third mixers 188 and 189. The other
input terminal of the second mixer 188 is connected through a line
190 to the other output terminal of the inverter 172. The output
terminal of the second mixer 188 is connected through a line 191 to
one output terminal 161 of the video amplifier 56'. The other input
terminal of the third mixer 189 is connected through a line 192 to
the line 171, and the output terminal of the third mixer 189 is
connected through a line 193 to the other output terminal 160.
When, in operation, a video image signal containing synchronizing
pulses is applied to the input amplifier 170, the video image
signal is amplified and applied through the line 171 to the
inverter which then produces on its two output terminals an
inverted image signal having an voltage polarity inverse to that of
the input image signal. The inverted image signal is applied
through the line 173 to the separator 174 which separates the
synchronizing pulses. These synchronizing pulses are then applied
through the line 175 to the horizontal separator 177 and through
the line 176 to the vertical separator 178. The horizontal
synchronizing pulse separated by the horizontal separator 177 is
applied through the line 179 to the horizontal blanking pulse
generator 181 which then generates a horizontal blanking pulse then
to be applied through the line 183 to one terminal of the first
mixer 185. The vertical separator 178 separates the vertical
synchronizing pulses which are then applied through the line 180 to
the vertical blanking pulse generator 182. The blanking pulse
generator 182 then produces a vertical blanking pulse which is
applied through the line 184 to the other terminal of the first
mixer 185. The mixed output signal from the first mixer 185 is a
mixed blanking signal of horizontal and vertical blanking pulse
signal which is then applied through the line 186 to one terminal
of the second mixer 188. To the other terminal of the second mixer
188 is applied through the line 190 the inverted video image signal
which is then mixed with the mixed blanking signal and appears on
the line 191. The mixed blanking signal is also applied through the
line 187 to one terminal of the third mixer 189. To the other
terminal of the third mixer 189 through the line 192 is applied the
supplied video signal which is then mixed with the mixed blanking
signal and appears on the line 192.
In this instance, it should be noted that since the blanking pulse
formed by this video amplifier 56' is derived from the
synchronizing pulse, the leading edge of the thus formed blanking
pulse is delayed from the leading edge of the original blanking
pulse contained in the supplied video image signal. Since,
furthermore, the blanking pulse is inverted, the blanking pulse has
a white level so that a bright line appears at the hatched areas,
indicated by character C, of the faceplate 32 shown in FIG. 11. To
avoid production of such bright lines, the phosphorous layer should
be deviated to a position surrounded by a broken line D.
FIG. 12 shows a modified form of the circuit of FIG. 4, wherein a
gamma-corrector 200 of any known type is interposed between the
switch 164 and the line 157 so as to have the intensity of the
electron beam modulated in accordance with the characteristics of
the recording medium pressed upon the faceplate 32.
FIG. 13 shows another modified form of the circuit of FIG. 4,
wherein a repeater 201 is interposed between the switch 164 and the
line 157. This repeater 201 memorizes the image signal and then
delivers the memorized image signal repeatedly several times which
are determined in compliance with the sensitivity of the recording
medium so as to sufficiently have the recording medium exposed to
the video image.
FIG. 14 illustrates a further modified form of the circuit of FIG.
4, wherein a normally-open switch is provided in parallel with the
gate 71. The switch 202 is useful where a video image signal
carrying a static video image should be recorded, wherein the
switch 202 is kept closed even after the gate 71 has been opened.
This switch 202 may be used otherwise in regulating the
astigmatism, sweep timing, intensity and focus, horizontal and
vertical position and so on of the recording cathode-ray tube
25.
FIG. 15 shows still further modified form of the circuit of FIG. 4,
wherein the deflector 62 provided with three output contact
terminals 204, 205 and 206 on which corresponding deflection
signals produced having various amplitudes and bias levels. These
terminals 205, 206 and 207 are selected by a movable contact 207
which is connected to the deflection coil 65. When such a video
image as shown in FIG. 16 (a) is applied to this circuit, the video
image is partly reproduced on the faceplate on an enlarged scale as
shown in FIG. 16 (b) or (c) according to a deflection signal on
either terminal 204, 205 or 206 selected by the movable contact
207.
FIG. 17 shows a still further modified form of the circuit of FIG.
4 wherein the deflector 62 has two output terminals 210 and 211
through which two deflection signals having polarities, which are
inverse to each other. Through provision of such deflector 62,
horizontally inverted video images can be produced by selectively
switching the selecting movable contact 212 between the two
positions.
FIG. 18 shows a still further modified form of the circuit of FIG.
4, wherein the recording tube 31 is provided with an additional
electron gun (not shown). To a grid associated with the additional
electron gun is connected a video signal generator 213 which
produces a video signal carrying a piece of information such as
advertising phrases when it is energized through a line 214 by the
single-frame gate 68.
It should now be understood that, although only one cathode-ray
tube has been used in the above-described embodiments, a plurality
of recording cathode-ray tube may be used.
Furthermore, the picture tube may be replaced with any other
monitoring tube or may be removed in some cases.
* * * * *