US3740472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Width control circuit for a television receiver
Assignee: RCA Licensing Corp
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Filing: 1971-11-24
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Granted: 1973-06-19
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Expires: 1991-11-24
Abstract
Abstract Resistor and capacitor type width controls are combined in a manner to utilize the advantages of each in optimizing television picture reproduction, but in a manner to constrain the high voltages produced by the receiver''s horizontal deflection circuit under incorrect adjustment conditions. Such combination can be used to reduce the possibility of the high voltage developed for the cathode-ray picture tube increasing to a value at which Xradiations can be produced.
Inventors
- 👤 W Fitzgerald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:59
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/223
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
156 words
In a television receiver having an image reproducing kinescope, a horizontal output tube, a high voltage rectifier circuit and a flyback pulse transformer, the combination comprising: a source of energizing potential; resistance means adapted for coupling said potential source to a control electrode of said output tube to establish a bias voltage thereon; a tuning circuit including capacitance means coupled across a winding of said transformer to establish the amplitude and width of the pulse developed thereby; first switching means for varying the amount of resistance coupling said source to said horizontal tube control electrode; and second switching means for varying the amount of capacitance within said tuning circuit; said first and second switching means being operative to controllably vary the output current of said tube and the resulting width of the image reproduced by said kinescope, while constraining the high voltage developed by said rectifier circuit to limits at which X-radiations are not substantially produced.
Claim 2
Dependent Claim
156 words
In a television receiver having an image reproducing kinescope, a horizontal output tube, a high voltage rectifier circuit and a flyback pulse transformer, the combination comprising: a source of energizing potential; resistance means adapted for coupling said potential source to a control electrode of said output tube to establish a bias voltage thereon; a tuning circuit including capacitance means coupled across a winding of said transformer to establish the amplitude and width of the pulse developed thereby; first switching means for varying the amount of resistance coupling said source to said horizontal tube control electrode; and second switching means for varying the amount of capacitance within said tuning circuit; said first and second switching means being operative to controllably vary the output current of said tube and the resulting width of the image reproduced by said kinescope, while constraining the high voltage developed by said rectifier circuit to limits at which X-radiations are not substantially produced.
Claim 3
Dependent Claim
36 words
The combination of claim 1 wherein said horizontal output tube is of pentode type construction and said resistance means includes a pair of resistors serially coupling said source of energizing potential to the screen grid thereof.
Claim 4
Dependent Claim
45 words
The combination of claim 2 wherein said first switching means includes means for short circuiting at least one of said pair of resistors to control the bias voltage developed at said screen grid when it is desired to vary the output current of said tube.
Claim 5
Dependent Claim
41 words
The combination of claim 3 wherein said capacitance means includes a capacitor and wherein said second switching means includes means for inserting said capacitor into said tuning circuit to decrease the amplitude of the pulse developed thereby while increasing its width.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |