US3681646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method to produce symbols composed of straight lines on the screen
Assignee: Siemens AG
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Filing: 1968-09-19
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Granted: 1972-08-01
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Expires: 1988-09-19
Abstract
Abstract A cathode ray system for producing visible symbols comprised of straight lines including means for producing digital information indicative of the symbols to be produced, digital analogconverters for generating voltage values in response to the digital information supplied thereto and means for applying the output voltages from the digital analog-converter to the deflection system of a cathode ray tube. The cathode ray beam is scanned in the horizontal direction and the output voltages from the digital analog-converter are applied to image deflection coils for deflecting the beam in the vertical direction. The voltage applied to the image deflection coils is a step-like voltage of the required pattern to produce the desired symbol on the screen of the tube. During portions of the sweep when writing is not required, dark scanning is employed.
Inventors
- 👤 Herbert Brehm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:11
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/04; G09G1/06; G09G1/08; G09G1/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
146 words
A system for generating symbols on the screen of a cathode ray tube comprising: means for generating digital signals corresponding to the information to be displayed, converter means for translating said digital signals into voltage waveforms corresponding to the sweep pattern required to be taken by the cathode ray to produce the desired illustration on the screen of the cathode ray tube, said voltage waveforms having a step-like configuration to generate symbols on said cathode ray screen composed of substantially straight line portions, and means for coupling said step-like waveforms to one of the deflection systems of said cathode ray tube, said cathode ray tube having a deflection amplifier and the output signals from said converter being fed to said deflection amplifier to control the sweep of said cathode ray, said deflection amplifier having a push-pull transistor output phase and a galvanically coupled preliminary transistor phase.
Claim 2
Independent Claim
146 words
A system for generating symbols on the screen of a cathode ray tube comprising: means for generating digital signals corresponding to the information to be displayed, converter means for translating said digital signals into voltage waveforms corresponding to the sweep pattern required to be taken by the cathode ray to produce the desired illustration on the screen of the cathode ray tube, said voltage waveforms having a step-like configuration to generate symbols on said cathode ray screen composed of substantially straight line portions, and means for coupling said step-like waveforms to one of the deflection systems of said cathode ray tube, said cathode ray tube having a deflection amplifier and the output signals from said converter being fed to said deflection amplifier to control the sweep of said cathode ray, said deflection amplifier having a push-pull transistor output phase and a galvanically coupled preliminary transistor phase.
Claim 3
Dependent Claim
143 words
In a system for generating symbols on the screen of a television picture tube wherein the symbol information is fed to a memory in digital form and converted by means of digital analog-converters into a step-like voltage waveform which is coupled along with the sawtooth deflection voltage to the deflection coils of the picture tube in such a manner that the symbols on the picture tube are composed of straight lines, a deflection device comprising a push-pull amplifier having a pair of amplifier devices, sources of positive and negative voltage, the amplifier devices coupled between said sources with one being coupled to the positive source and the other to the negative source, deflection coils, said deflection coils having one terminal coupled to a center tap between said sources of voltage and having the other terminal coupled to an output of the push-pull amplifier.
Claim 4
Dependent Claim
143 words
In a system for generating symbols on the screen of a television picture tube wherein the symbol information is fed to a memory in digital form and converted by means of digital analog-converters into a step-like voltage waveform which is coupled along with the sawtooth deflection voltage to the deflection coils of the picture tube in such a manner that the symbols on the picture tube are composed of straight lines, a deflection device comprising a push-pull amplifier having a pair of amplifier devices, sources of positive and negative voltage, the amplifier devices coupled between said sources with one being coupled to the positive source and the other to the negative source, deflection coils, said deflection coils having one terminal coupled to a center tap between said sources of voltage and having the other terminal coupled to an output of the push-pull amplifier.
Claim 5
Dependent Claim
32 words
A deflection device in accordance with claim 2 wherein the outputs of the digital analog converters are DC coupled to the point of connection between the deflection coil and the push-pull amplifier.
Claim 6
Dependent Claim
31 words
A deflection device in accordance with claim 3 wherein a resistance is placed in series with the deflection coil between the coil and the point of connection with the push-pull amplifier.
Claim 7
Dependent Claim
28 words
A deflection device in accordance with claim 2 wherein each of said amplifier devices has a preliminary phase amplifier element which is DC coupled to the inputs thereof.
Claim 8
Dependent Claim
54 words
A deflection device in accordance with claim 5 wherein the preliminary amplifier devices of the deflection amplifier have an input transistor coupled thereto, said input transistor having a base electrode coupled to both the output of the digital analog-converter and to a point located between the deflection coils and output of the push-pull amplifier.
Claim 9
Dependent Claim
56 words
A device in accordance with claim 6 wherein the input transistor has an additional transistor coupled to the emitter thereof and wherein a Zener diode is coupled between the emitter and collector of said additional transistor and wherein a temperature compensating diode is coupled to said additional transistor to Provide temperature compensation for said input transistor.
Claim 10
Dependent Claim
37 words
A device in accordance with claim 7 wherein a series of temperature compensating diodes are coupled between the collector of said input transistor and the input of said preliminary amplifiers to provide temperature compensation for said amplifiers.
Claim 11
Dependent Claim
54 words
A device in accordance with claim 8 wherein a temperature dependent resistance is coupled between the base of said input transistor and the output of said digital analog-converter and wherein said temperature-dependent resistance is in heat-conductive relationship with at least one of the amplifier devices of the deflection amplifier to protect against temperature overload.
Claim 12
Dependent Claim
41 words
A system for generating symbols in accordance with claim 1 wherein said preliminary phase of said deflection amplifier has an input transistor and wherein said input transistor has its base electrode coupled in feedback relation with the output of said amplifier.
Claim 13
Dependent Claim
55 words
A system for generating symbols in accordance with claim 10 wherein said input transistor and an additional transistor have a joint compensating emitter resistance, a Zener diode coupled between the emitter to collector electrodes of said additional transistor and a silicon diode connected in its collector base branch causing temperature compensation for said input transistor.
Claim 14
Dependent Claim
23 words
A system for generating symbols in accordance with claim 11 wherein said input transistor is connected galvanically with the output of said converter.
Claim 15
Dependent Claim
44 words
A system for generating symbols in accordance with claim 12 wherein a cold conductor is coupled to the input of the said amplifier, said cold conductor being connected in a heat-conductive manner to at least one of said preliminary phase transistors of the amplifier.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |