US3713134A
Expired / Lapsed
US
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Digital stroke character generator
Assignee: Corning Glass Works
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Filing: 1970-09-16
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Granted: 1973-01-23
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Expires: 1990-09-16
Abstract
Abstract A system for generating characters by deflecting an electron beam over a screen having orthogonal X and Y axes. Beam deflection and modulation commands for each segment of each character are stored in read only memories. The deflection commands are read out to a binary rate multiplier after a character has been selected. The binary rate multiplier generates X and Y pulse trains having independently variable binary rates under the control of the deflection commands. The pulse trains are then applied to X and Y UP/DOWN counters and digital-toanalog converters to generate X and Y deflection signals in analog form having independently variable rates of change corresponding to the binary rates of the digital deflection signals. The polarity or direction of the rate of change is determined by deflection commands which control the direction of count in the UP/DOWN counters.
Inventors
- 👤 H Chaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:47
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/06; G09G1/08; G09G1/10; G06; G06F; G06F7/00; G06F7/60; G06F7/68
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
313 words
A character generator system of the type having a display device including a screen, an electron beam source, an X deflection means for deflecting the beam across the screen in a direction parallel to the X axis, and a Y deflection means for deflecting the beam across the screen in a direction parallel to the Y axis, said system comprising: a control means for generating digital X axis deflection commands representing appropriate X axis deflection and digital Y axis deflection commands representing appropriate Y axis deflection during time intervals of substantially uniform length for each segment of each character to be displayed; a pulse train generating means comprising a source of pulses and a binary rate multiplier coupled to the output of said control means for generating digital X axis and Y axis pulse trains for each segment having independently variable binary rates determined by said X axis and Y axis deflection commands, said X axis and Y axis pulse trains for each segment being generated in one of said time intervals of substantially uniform length regardless of segment length; an analog deflection signal generating means coupled to the output of said pulse train generating means for generating analog X axis and Y axis deflection signals from said X axis and Y axis pulse trains respectively for application to the X deflection means and the Y deflection means respectively, said analog X axis and Y axis deflection signals generating each segment of each character during one of said time intervals of substantially uniform length, said analog signals having rates of change corresponding to said independently variable binary rates; and an intensity control gating means having an input coupled to the output of said binary rate multiplier and an output coupled to said display device for controlLing the intensity of said electron beam in response to said X axis and Y axis pulse trains.
Claim 2
Dependent Claim
313 words
A character generator system of the type having a display device including a screen, an electron beam source, an X deflection means for deflecting the beam across the screen in a direction parallel to the X axis, and a Y deflection means for deflecting the beam across the screen in a direction parallel to the Y axis, said system comprising: a control means for generating digital X axis deflection commands representing appropriate X axis deflection and digital Y axis deflection commands representing appropriate Y axis deflection during time intervals of substantially uniform length for each segment of each character to be displayed; a pulse train generating means comprising a source of pulses and a binary rate multiplier coupled to the output of said control means for generating digital X axis and Y axis pulse trains for each segment having independently variable binary rates determined by said X axis and Y axis deflection commands, said X axis and Y axis pulse trains for each segment being generated in one of said time intervals of substantially uniform length regardless of segment length; an analog deflection signal generating means coupled to the output of said pulse train generating means for generating analog X axis and Y axis deflection signals from said X axis and Y axis pulse trains respectively for application to the X deflection means and the Y deflection means respectively, said analog X axis and Y axis deflection signals generating each segment of each character during one of said time intervals of substantially uniform length, said analog signals having rates of change corresponding to said independently variable binary rates; and an intensity control gating means having an input coupled to the output of said binary rate multiplier and an output coupled to said display device for controlLing the intensity of said electron beam in response to said X axis and Y axis pulse trains.
Claim 3
Dependent Claim
44 words
The character generator system of claim 1 wherein said control means includes means for generating Z axis modulation commands for each segment of each character to be displayed for selectively enabling the intensity control gating means in response to said Z axis modulating commands.
Claim 4
Dependent Claim
57 words
The character generator system of claim 2 wherein said control means generates polarity commands for each segment of each character to be displayed, and said analog deflection signal generating means includes means for controlling the polarity of said rate of change of said analog X axis and Y axis deflection signals in response to said polarity commands.
Claim 5
Dependent Claim
197 words
The character generator system of claim 1 wherein said binary rate multiplier comprises: a counter generating a plurality of outputs having different binary rates; AND gate means comprising an X group of gates and a Y group of gates, the plurality of said outputs from said counter being applied to corresponding inputs of said X group of gates and said Y group of gates, said X group of gates and said Y group of gates being selectively enabled by said deflection commands so as to generate a combined output at said X group of gates and a combined output at said Y group of gates having binary rates equal to the sum of the binary rates for the particular gates enabled in said X group of gates and said Y group of gates respectively; and an X OR gate means and a Y OR gate means having inputs coupled to the outputs of said X group of gates and said Y group of gates respectively, the outputs of said X OR gate means and said Y OR gate means providing the inputs to said X analog deflection signal means and said Y analog deflection signal means respectively.
Claim 6
Dependent Claim
90 words
The character generator system of claim 4 wherein said control means generates deflection polarity commands for each segment of each character to be displayed, said analog deflection signal generating means comprising X and Y axis UP/DOWN counters coupled to the output of said X OR gate means and said Y OR gate means respectively and further comprising X and Y axis digital-to-analog convertors coupled to the outputs of said X and Y axis UP/DOWN counters, the counting direction of each said UP/DOWN counter being controlled by said deflection polarity commands.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |