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US3852640A
Expired / Lapsed
US
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Cathode ray tube circuit
Assignee: Lockheed Martin Corp
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Filing: 1973-09-17
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Granted: 1974-12-03
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Expires: 1993-09-17
Abstract
Abstract A cathode ray tube circuit arrangement having digitally operated control circuits for controlling beam deflection signals, a decoder which identifies predetermined beam positions and a function generator which provides a signal for modifying a beam control signal according to an identified position of the beam.
Inventors
- 👤 B Mccarthy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:41
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/34; G09; G09G; G09G1/00; G09G1/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
141 words
A cathode ray tube circuit having first and second means for generating x and y beam deflection signals, respectively, to provide a raster scan, a connection for coupling a signal proportional to the y deflection signal to the x deflection signal generating means to modify the x deflection signal according to the y deflection signal thereby to provide a correction for the trapezium distortion of an image on the screen that might otherwise occur, first and second digitally operated control means connected for controlling the said first and second beam deflection signal generating means respectively, a decoder having an input connected to the output from one of the control means and a function generator having an input connected to the output from the decoder and an output providing a signal for modifying a control signal for a cathode ray tube beam.
Claim 2
Dependent Claim
141 words
A cathode ray tube circuit having first and second means for generating x and y beam deflection signals, respectively, to provide a raster scan, a connection for coupling a signal proportional to the y deflection signal to the x deflection signal generating means to modify the x deflection signal according to the y deflection signal thereby to provide a correction for the trapezium distortion of an image on the screen that might otherwise occur, first and second digitally operated control means connected for controlling the said first and second beam deflection signal generating means respectively, a decoder having an input connected to the output from one of the control means and a function generator having an input connected to the output from the decoder and an output providing a signal for modifying a control signal for a cathode ray tube beam.
Claim 3
Dependent Claim
56 words
A cathode ray tube circuit as claimed in claim 1 wherein the input to the decoder from the control means comprises a series of digital signals fed at a rate which is proportional to and less than the rate at which signals are fed from the control means to the means for generating beam deflection signals.
Claim 4
Dependent Claim
70 words
A cathode ray tube circuit as claimed in claim 1 wherein each of the first and second control means is consituted by a counter, including means for coupling to the counters a series of pulses obtained from a clock under the control of the synchronizing pulses of a video signal, whereby scanning of the face of the cathode ray tube in synchronism with an image to be displayed is obtained.
Claim 5
Dependent Claim
72 words
A cathode ray tube circuit as claimed in claim 1 including a function generator having its input connected to the output of the first decoder and its output connected to a focus control electrode, whereby a correction signal can be applied to the focus control electrode according both to the deflection of the beam by signals generated by the first beam generating means and to the output of the said function generator.
Claim 6
Dependent Claim
83 words
A cathode ray tube circuit as claimed in claim 1 wherein the function generator comprises a circuit which includes a load resistor across which the output signal for modifying a control signal can be obtained, a plurality of function determining resistors each in series with the load resistor, a diode connected to each function determining resistor, and means for connecting a signal to each diode in turn whereby a plurality of output signals each corresponding to a predetermined beam position can be provided.
Claim 7
Dependent Claim
19 words
A circuit as claimed in claim 5 wherein the function determining resistors are connected in series with one another.
Claim 8
Dependent Claim
21 words
A circuit arrangement as claimed in claim 1 wherein the control means are operated by digital signals in the binary form.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |