Patent US4942877A successfully refreshed from Google Patents.
Patent US3786483A successfully refreshed from Google Patents.
US3786483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brightness control for a color cathode ray tube
Assignee: Alcatel CIT SA
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Filing: 1972-04-21
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Granted: 1974-01-15
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Expires: 1992-04-21
Abstract
Abstract Device for controlling the brightness of the trace of vectors on the screen of a cathode tube, which is more particularly polychromatic, comprising a clock, a vector generator and means for making the brightness of the trace vary. These means consist of frequency dividers connected to the output of the clock and supplying, to the vector generator, adjustable frequency pulses.
Inventors
- 👤 D Sinobad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:08
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/28; G01; G01S; G01S7/00; G01S7/02; G01S7/04; G01S7/06; G01S7/062; G01S7/064; G01S7/22; G09G1/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
Device for controlling the brightness of the trace of vectors on the screen of a cathode ray tube, comprising vector generator means responsive to input signals representing the directing parameters of the vectors to be traced for supplying at its output an analog beam deflection control signal, a clock supplying control pulses to drive said vector generator, and frequency control means for varying the frequency of the control pulses provided by said clock, wherein said frequency control means for varying the frequency of the control pulses comprises a succession of frequency dividers connected to the output of said clock, a plurality of AND gates each receiving on one respective input the output signal of a respective divider, a second input of each gate receiving an individual opening control signal, and an OR gate having its inputs connected to the output of each of said AND gates, the output of said OR gate supplying frequency adjusted control pulses to said vector generator means.
Claim 2
Dependent Claim
162 words
Device for controlling the brightness of the trace of vectors on the screen of a cathode ray tube, comprising vector generator means responsive to input signals representing the directing parameters of the vectors to be traced for supplying at its output an analog beam deflection control signal, a clock supplying control pulses to drive said vector generator, and frequency control means for varying the frequency of the control pulses provided by said clock, wherein said frequency control means for varying the frequency of the control pulses comprises a succession of frequency dividers connected to the output of said clock, a plurality of AND gates each receiving on one respective input the output signal of a respective divider, a second input of each gate receiving an individual opening control signal, and an OR gate having its inputs connected to the output of each of said AND gates, the output of said OR gate supplying frequency adjusted control pulses to said vector generator means.
Claim 3
Dependent Claim
20 words
Device according to claim 1 wherein said frequency dividers are connected in series with the output of the said clock.
Claim 4
Dependent Claim
20 words
Device according to claim 1 wherein said frequency dividers are connected in parallel to the output of the said clock.
Claim 5
Dependent Claim
108 words
Device according to claim 1 wherein said vector generator means includes a binary frequency multiplier receiving binary signals representing the X and Y parameters in Cartesian coordinates of the data to be displayed and said control pulses, a pair of bidirectional counters connected to receive respective outputs from said binary frequency multiplier relating to the respective X and Y parameters and binary signals representing the starting point in Cartesian coordinates of the data to be displayed, a respective digit-analog converter connected to the output of said bidirectional counters, the outputs of said respective converters being connected to the horizontal and vertical deflection apparatus of said cathode ray tube.
Claim 6
Dependent Claim
20 words
Device according to claim 4 wherein said frequency dividers are connected in series with the output of the said clock.
Claim 7
Dependent Claim
103 words
Device for controlling the brightness of the trace of vectors on the screen of a cathode ray tube, comprising vector generator means responsive to input signals representing the directing parameters of the vectors to be traced for supplying at its output an analog beam deflection control signal, a clock supplying control pulses to drive said vector generator, and frequency control means for varying the frequency of the control pulses provided by said clock, wherein said frequency control means includes means for varying the frequency of said control pulses to three distinct levels in response to the application thereto of three distinct control signals.
Claim 8
Dependent Claim
103 words
Device for controlling the brightness of the trace of vectors on the screen of a cathode ray tube, comprising vector generator means responsive to input signals representing the directing parameters of the vectors to be traced for supplying at its output an analog beam deflection control signal, a clock supplying control pulses to drive said vector generator, and frequency control means for varying the frequency of the control pulses provided by said clock, wherein said frequency control means includes means for varying the frequency of said control pulses to three distinct levels in response to the application thereto of three distinct control signals.
Claim 9
Dependent Claim
112 words
Device for controlling the brightness of the trace of vectors on the screen of a cathode ray tube, comprising vector generator means responsive to input signals representing the directing parameters of the vectors to be traced for supplying at its output an analog beam deflection control signal, a clock supplying control pulses to drive said vector generator, and frequency control means for varying the frequency of the control pulses provided by said clock, wherein said cathode ray tube is a polychromatic tube and said frequency control means includes means for varying the frequency of said control pulses to a different distinct level for each respective color traced in said cathode ray tube.
Claim 10
Dependent Claim
112 words
Device for controlling the brightness of the trace of vectors on the screen of a cathode ray tube, comprising vector generator means responsive to input signals representing the directing parameters of the vectors to be traced for supplying at its output an analog beam deflection control signal, a clock supplying control pulses to drive said vector generator, and frequency control means for varying the frequency of the control pulses provided by said clock, wherein said cathode ray tube is a polychromatic tube and said frequency control means includes means for varying the frequency of said control pulses to a different distinct level for each respective color traced in said cathode ray tube.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |