US3735192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical deflection circuits utilizing both regenerative and degenerative feedback for generating parabolic voltages
Assignee: RCA Licensing Corp
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Filing: 1971-04-14
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Granted: 1973-05-22
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Expires: 1991-04-14
Abstract
Abstract S-shaping is introduced into a sawtooth waveform by a combination of positive and negative feedback of separately adjustable, generally parabolic voltage waveforms so as to provide a suitable field (vertical) deflection signal for a wide deflection angle kinescope. Output and drive transistors are cut off relatively rapidly at the end of scan and are returned to conduction at the beginning of scan by coupling capacitive elements in the sawtooth generating circuit to the inputs of the transistors.
Inventors
- 👤 L Avery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:37
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/233; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/69; H03K4/72; H03K4/725
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
134 words
A deflection circuit comprising: first and second series connected capacitors; means for supplying a relatively constant current to said capacitors to produce a substantially linearly varying voltage across said capacitors; means coupled across said capacitors for periodically discharging said capacitors; an output circuit comprising a deflection coil and amplifying means for coupling time-varying voltages produced across said capacitors to said deflection coil; regenerative feedback means coupled from said output circuit to the junction of said first and second capacitors for adding a first substantially parabolically varying voltage to said linearly varying voltage; and degenerative feedback means coupled from said output circuit to the junction of said first and second capacitors for adding to said linearly varying voltage a second substantially parabolically varying voltage of opposite phase with respect to said first parabolically varying voltage.
Claim 2
Dependent Claim
134 words
A deflection circuit comprising: first and second series connected capacitors; means for supplying a relatively constant current to said capacitors to produce a substantially linearly varying voltage across said capacitors; means coupled across said capacitors for periodically discharging said capacitors; an output circuit comprising a deflection coil and amplifying means for coupling time-varying voltages produced across said capacitors to said deflection coil; regenerative feedback means coupled from said output circuit to the junction of said first and second capacitors for adding a first substantially parabolically varying voltage to said linearly varying voltage; and degenerative feedback means coupled from said output circuit to the junction of said first and second capacitors for adding to said linearly varying voltage a second substantially parabolically varying voltage of opposite phase with respect to said first parabolically varying voltage.
Claim 3
Dependent Claim
31 words
A deflection circuit according to claim 1 wherein: each of said regenerative and degenerative feedback means comprises a variable resistance for separately varying said first and second parabolically varying voltages, respectively.
Claim 4
Dependent Claim
24 words
A deflection circuit according to claim 1 wherein: said degenerative feedback means comprises a first variable resistance for varying said second parabolically varying voltage.
Claim 5
Dependent Claim
30 words
A deflection circuit according to claim 3 wherein: said degenerative feedback means further comprises resistive means connected in series with said deflection coil for sampling current in said deflection coil.
Claim 6
Dependent Claim
57 words
A deflection circuit according to claim 4 wherein: said amplifying means comprising an output transistor coupled in a common emitter configuration for supplying said time-varying voltages to said deflection coil; and second resistive means coupled to said output transistor for sampling current in said output transistor; said second resistive means being coupled to said regenerative feedback means.
Claim 7
Dependent Claim
187 words
A deflection circuit comprising: first aNd second series-connected capacitors; means for supplying a relatively constant current to said capacitors to produce a substantially linearly varying voltage across said capacitors; means coupled across said capacitors for periodically discharging said capacitors; an output circuit comprising a deflection coil and amplifying means for coupling time-varying voltages produced across said capacitors to said deflection coil, said amplifying means comprising at least a driver transistor having an input coupled to said capacitors, an output transistor having an input coupled to said driver transistor and an output coupled to said coil, and a relatively low resistance element coupled from the junction of said capacitors to the input of said output transistor; regenerative feedback means coupled from said output circuit to the junction of said first and second capacitors for adding a first substantially parabolically varying voltage to said linearly varying voltage; and degenerative feedback means coupled from said output circuit to the junction of said first and second capacitors for adding to said linearly varying voltage a second substantially parabolically varying voltage of opposite phase with respect to said first parabolically varying voltage.
Claim 8
Dependent Claim
187 words
A deflection circuit comprising: first aNd second series-connected capacitors; means for supplying a relatively constant current to said capacitors to produce a substantially linearly varying voltage across said capacitors; means coupled across said capacitors for periodically discharging said capacitors; an output circuit comprising a deflection coil and amplifying means for coupling time-varying voltages produced across said capacitors to said deflection coil, said amplifying means comprising at least a driver transistor having an input coupled to said capacitors, an output transistor having an input coupled to said driver transistor and an output coupled to said coil, and a relatively low resistance element coupled from the junction of said capacitors to the input of said output transistor; regenerative feedback means coupled from said output circuit to the junction of said first and second capacitors for adding a first substantially parabolically varying voltage to said linearly varying voltage; and degenerative feedback means coupled from said output circuit to the junction of said first and second capacitors for adding to said linearly varying voltage a second substantially parabolically varying voltage of opposite phase with respect to said first parabolically varying voltage.
Claim 9
Dependent Claim
31 words
A deflection circuit according to claim 6 wherein: each of said regenerative and degenerative feedback means comprises a variable resistance for separately varying said first and second parabolically varying voltages, respectively.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |