US4223251A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflection circuit with retrace control
Assignee: RCA Licensing Corp
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Filing: 1979-05-24
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Granted: 1980-09-16
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Expires: 1999-05-24
Abstract
Abstract A horizontal deflection winding forms a resonant retrace circuit with two series coupled retrace capacitors during a retrace interval. A controllable circuit in shunt with the second capacitor bypasses a controlled amount of retrace current from that capacitor thereby controlling the retrace pulse width. East-west raster correction, width control and pulse amplitude control are possible depending on the variables selected for control.
Inventors
- 👤 Peter E. Haferl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:22
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/08; H03K4/48; H03K4/60; H03K4/62; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/233
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A retrace controllable deflection circuit, comprising: a deflection winding; a source of trace voltage coupled to said deflection winding; a trace switch coupled to said deflection winding for generating a trace deflection current in said deflection winding during a trace interval of a deflection cycle; a retrace capacitance network coupled to said deflection winding for forming a resonant retrace circuit with said deflection winding during a retrace interval of each deflection cycle, wherein retrace deflection current flows in said network during said retrace interval; and controllable shunting means coupled to said retrace capacitance network for bypassing a portion of said retrace deflection current from at least a portion of said network, for controlling the retrace pulse width.
Claim 2
Dependent Claim
117 words
A retrace controllable deflection circuit, comprising: a deflection winding; a source of trace voltage coupled to said deflection winding; a trace switch coupled to said deflection winding for generating a trace deflection current in said deflection winding during a trace interval of a deflection cycle; a retrace capacitance network coupled to said deflection winding for forming a resonant retrace circuit with said deflection winding during a retrace interval of each deflection cycle, wherein retrace deflection current flows in said network during said retrace interval; and controllable shunting means coupled to said retrace capacitance network for bypassing a portion of said retrace deflection current from at least a portion of said network, for controlling the retrace pulse width.
Claim 3
Dependent Claim
31 words
A circuit according to claim 1 wherein said retrace capacitance network comprises first and second series coupled retrace capacitors, said controllable shunting means in shunt relationship with said second retrace capacitor.
Claim 4
Dependent Claim
52 words
A circuit according to claim 2 wherein said controllable shunting means provides first and second shunt paths for bypassing retrace current from said second retrace capacitor, a controllable switch coupled in said first shunt path controlling the amount of retrace current of a first polarity being bypassed from said second retrace capacitor.
Claim 5
Dependent Claim
46 words
A circuit according to claim 3 including control means coupled to said controllable switch and responsive to a first quantity within said deflection circuit to be controlled for varying the conduction of said controllable switch for controlling the retrace pulse width for controlling said first quantity.
Claim 6
Dependent Claim
31 words
A circuit according to claim 4 including a resonant circuit capacitively coupled to said controllable switch for controlling the DC current flow through said controllable switch for controlling said first quantity.
Claim 7
Dependent Claim
15 words
A circuit according to claim 5 wherein said resonant circuit commutates off said controllable switch.
Claim 8
Dependent Claim
18 words
A circuit according to claim 6 wherein said controllable switch comprises an SCR and a parallel oppositely-poled diode.
Claim 9
Dependent Claim
41 words
A circuit according to claim 1, 2, 3, 4 or 5 including a regulator power supply coupled to said deflection circuit and responsive to a second quantity other than said first quantity for regulating the energy flow to said deflection circuit.
Claim 10
Dependent Claim
17 words
A circuit according to claim 8 wherein said first quantity is representative of said retrace pulse width.
Claim 11
Dependent Claim
28 words
A circuit according to claim 9 wherein said first quantity comprises the time-integrated voltage developed across a flyback transformer winding during one of said trace and retrace intervals.
Claim 12
Dependent Claim
22 words
A circuit according to claim 9 wherein said first quantity includes a vertical deflection rate component for providing east-west raster width control.
References Cited (Backward Citations)
US3962602A
Cited
US4034263A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |