US3641256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Black and white television camera expandable to a color television camera
Assignee: Individual
•
Filing: 1970-09-17
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Granted: 1972-02-08
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Expires: 1990-09-17
Abstract
Abstract In a television camera comprising a vidicon tube having a cathode and grid, a vertical yoke, and a horizontal yoke, the improvement comprising a color wheel assembly including a color wheel having a plurality of peripherally spaced-apart transparent color filter segments, the wheel being positioned and arranged relative to the vidicon tube to change the spectral response of its image pickup into an ordered sequence of colors, means for driving the wheel at a predetermined constant speed, and switch means responsive to movement of the wheel to provide a predetermined number of pulses per revolution of the wheel. First circuit means is provided for processing the pulses as well as color synch pulses. The camera includes blank and synch circuitry, and the improvement also comprises a multivibrator including alternately saturated collector circuits, one of the collector circuits being connected to the horizontal yoke to provide horizontal pulses thereto, the other of the collector circuits being connected to the blank and synch circuitry to provide blanking pulses thereto. The blank and synch circuitry includes two NPN transistor stages, the first stage of which produces positive-going blanking pulses for application to the cathode of the vidicon tube and the second stage of which produces negative-going pulses for application to the grid of the vidicon tube, whereby the tube is blank during retrace by composite positive and negative pulses.
Inventors
- 👤 Gary F Davis Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:11
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/10; H04N23/12
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
126 words
In a television camera comprising a vidicon tube having a cathode and grid, a vertical yoke, and a horizontal yoke, the improvement comprising a color wheel assembly including a color wheel having a plurality of peripherally spaced-apart transparent color filter segments, said wheel being positioned and arranged relative to said vidicon tube to change the spectral response of its image pickup into an ordered sequence of colors, means for driving said wheel at a predetermined constant speed, and switch means responsive to movement of said wheel to provide a predetermined number of pulses per revolution of said wheel, and first circuit means for processing said pulses to provide vertical synch pulses, said circuit means providing an operative connection between said switch means and said vertical yoke.
Claim 2
Dependent Claim
126 words
In a television camera comprising a vidicon tube having a cathode and grid, a vertical yoke, and a horizontal yoke, the improvement comprising a color wheel assembly including a color wheel having a plurality of peripherally spaced-apart transparent color filter segments, said wheel being positioned and arranged relative to said vidicon tube to change the spectral response of its image pickup into an ordered sequence of colors, means for driving said wheel at a predetermined constant speed, and switch means responsive to movement of said wheel to provide a predetermined number of pulses per revolution of said wheel, and first circuit means for processing said pulses to provide vertical synch pulses, said circuit means providing an operative connection between said switch means and said vertical yoke.
Claim 3
Dependent Claim
17 words
The improvement of claim 1 in which said first circuit means includes a sawtooth generator and amplifier.
Claim 4
Dependent Claim
48 words
The improvement of claim 1 in which said wheel includes 12 of said segments of generally equal peripheral extent to provide two complete ordered sequences of color per revolution of said wheel consisting of a red, blue and green sequence followed by another red, blue and green sequence.
Claim 5
Dependent Claim
79 words
The improvement of claim 3 in which said wheel is driven at 30 revolutions per second, in which said switch means is positioned and arranged to provide 60 of said pulses per second at a constant pulse, repetition rate, and said switch means further being positioned and arranged to provide one of said pulses just prior to the red sequence of each of said two complete ordered sequences, whereby each of said pulses serves as a color synch pulse.
Claim 6
Dependent Claim
34 words
The improvement oF claim 4 in which said switch means includes magnetic means mounted on the periphery of said wheel and means responsive to said magnetic means disposed adjacent the periphery of said wheel.
Claim 7
Dependent Claim
17 words
The invention of claim 5 in which said first circuit means includes a sawtooth generator and amplifier.
Claim 8
Dependent Claim
62 words
The invention of claim 4 in which said camera includes blank and synch circuitry, and in which the improvement comprises a multivibrator including alternately saturated collector circuits, one of said collector circuits being connected to said horizontal yoke to provide horizontal pulses thereto, the other of said collector circuits being connected to said blank and synch circuitry to provide blanking pulses thereto.
Claim 9
Dependent Claim
36 words
The invention of claim 7 in which said multivibrator includes, as part of the load for said one collector circuit, an inductor effective to generate said horizontal pulses by autotransformer action when said multivibrator changes state.
Claim 10
Dependent Claim
34 words
The improvement of claim 1 in which said switch means includes magnetic means mounted on the periphery of said wheel and means responsive to said magnetic means disposed adjacent the periphery of said wheel.
Claim 11
Dependent Claim
62 words
The invention of claim 1 in which said camera includes blank and synch circuitry, and in which the improvement comprises a multivibrator including alternately saturated collector circuits, one of said collector circuits being connected to said horizontal yoke to provide horizontal pulses thereto, the other of said collector circuits being connected to said blank and synch circuitry to provide blanking pulses thereto.
Claim 12
Dependent Claim
36 words
The improvement of claim 10 in which said multivibrator includes, as part of the load for said one collector circuit, an inductor effective to generate said horizontal pulses by autotransformer action when said multivibrator changes state.
Claim 13
Dependent Claim
58 words
The improvement of claim 11 in which said multivibrator is a collector-coupled multivibrator including collector-coupled NPN-transistors, the saturation levels of which are such that positive-going pulses are applied thereby to said horizontal yoke and negative-going pulses are applied thereby to said blank and synch circuitry, each negative-going pulse occurring at the same time that a positive-going pulse occurs.
Claim 14
Dependent Claim
109 words
The invention of claim 12 in which said blank and synch circuitry includes a first NPN-transistor stage and a second NPN-transistor stage, the collector circuit of the first stage being connected to the base circuit of the second stage, said negative-going pulses provided by said multivibrator being applied to the base circuitry of said first stage to produce positive-going blanking pulses on its collector circuit for application to the cathode of said vidicon tube, said second stage responding to the last-said positive-going pulses to provide negative-going pulses for application to the grid of said vidicon tube, whereby said tube is blanked during retrace by composite positive and negative pulses.
Claim 15
Dependent Claim
70 words
In a television camera comprising a vidicon tube having a cathode and grid, a vertical yoke, a horizontal yoke and blank and synch circuitry, the improvement comprising a multivibrator including alternately saturated collector circuits, one of said collector circuits being connected to said horizontal yoke to provide horizontal pulses thereto and the other of said collector circuits being connected to said blank and synch circuitry to provide blanking pulses thereto.
Claim 16
Dependent Claim
70 words
In a television camera comprising a vidicon tube having a cathode and grid, a vertical yoke, a horizontal yoke and blank and synch circuitry, the improvement comprising a multivibrator including alternately saturated collector circuits, one of said collector circuits being connected to said horizontal yoke to provide horizontal pulses thereto and the other of said collector circuits being connected to said blank and synch circuitry to provide blanking pulses thereto.
Claim 17
Dependent Claim
36 words
The improvement of claim 14 in which said multivibrator includes, as part of the load for said one collector circuit, an inductor effective to generate said horizontal pulses by autotransformer action when said multivibrator changes state.
Claim 18
Dependent Claim
58 words
The improvement of claim 15 in which said multivibrator is a collector-coupled multivibrator including collector-coupled NPN-transistors, the saturation levels of which are such that positive-going pulses are applied thereby to said horizontal yoke and negative-going pulses are applied thereby to said blank and Synch circuitry, each negative-going pulse occurring at the same time that a positive-going pulse occurs.
Claim 19
Dependent Claim
109 words
The improvement of claim 16 in which said blank and synch circuitry includes a first NPN-transistor stage and a second NPN-transistor stage, the collector circuit of the first stage being connected to the base circuit of the second stage, said negative-going pulses provided by said multivibrator being applied to the base circuitry of said first stage to produce positive-going blanking pulses on its collector circuit for application to the cathode of said vidicon tube, said second stage responding to the last-said positive-going pulses to provide negative-going pulses for application to the grid of said vidicon tube, whereby said tube is blanked during retrace by composite positive and negative pulses.
Claim 20
Dependent Claim
58 words
The invention of claim 17 in which the improvement comprises an antenna, an RF oscillator driving said antenna, a video amplifier connecting the output of said vidicon tube to said oscillator, and means for connecting said second stage of said blank and synch circuitry to said oscillator whereby the last-said negative-going pulses are provided to synch said oscillator.
Claim 21
Dependent Claim
31 words
The invention of claim 17 in which the improvement comprises an unijunction transistor oscillator for initiating vertical synch pulses and an amplifier for connecting the last-said oscillator to said vertical yoke.
Claim 22
Dependent Claim
114 words
The invention of claim 14 in which the improvement further comprises a color wheel assembly including a color wheel having a plurality of peripherally spaced-apart transparent color filter segments, said wheel being positioned and arranged relative to said vidicon tube to change the spectral response of its image pickup into an ordered sequence of colors, means for driving said wheel at a predetermined constant speed, and switch means responsive to movement of said wheel to provide a predetermined number of pulses per revolution of said wheel, and first circuit means for processing said pulses to provide vertical synch pulses, said circuit means providing an operative connection between said switch means and said vertical yoke.
Claim 23
Dependent Claim
48 words
The invention of claim 20 in which said wheel includes 12 of said segments of generally equal peripheral extent to provide two complete ordered sequences of color per revolution of said wheel consisting of a red, blue and green sequence followed by another red, blue and green sequence.
Claim 24
Dependent Claim
79 words
The invention of claim 21 in which said wheel is driven at 30 revolutions per second, in which said switch means is positioned and arranged to provide 60 of said pulses per second at a constant pulse repetition rate, and said switch means further being positioned and arranged to provide one of said pulses just prior to the red sequence of each of said two complete ordered sequences, whereby each of said pulses serves as a color synch pulse.
References Cited (Backward Citations)
US2734937A
Cited
US2644032A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |