US4181874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television S-correction circuit with improved linearity
Assignee: RCA Licensing Corp
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Filing: 1977-12-12
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Granted: 1980-01-01
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Expires: 1997-12-12
Abstract
Abstract A television kinescope deflection circuit having improved linearity includes a deflection winding coupled in series with a first capacitor. A deflection switch and retrace capacitor are coupled across the serial combination of the deflection winding and first capacitor. The first capacitor responds to the deflection current to form a linearizing signal which modifies the flow of deflection current to provide S-correction. The linearity correction is improved by a series-resonant circuit coupled in parallel with the first capacitor and tuned to the second harmonic of the deflection frequency.
Inventors
- 👤 William E. Babcock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:51
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/237
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A television kinescope deflection arrangement having improved linearity; comprising: a kinescope deflection winding through which an oscillatory current flows at a deflection frequency; first linearity correction capacitance means coupled in series with said deflection winding and responsive to said oscillatory current to form a deflection linearity correction signal; retrace capacitance means coupled in parallel with the serial combination of said deflection winding and said first linearity correction capacitive means; a deflection switch coupled across said retrace capacitance means and operated at said deflection frequency to form recurrent trace and retrace portions of said oscillatory current; energy restoring means coupled to said deflection winding for maintaining said oscillatory current; and a series resonant circuit coupled in parallel with said first linearity correction capacitance means for reducing the flow of said oscillatory current at the second harmonic of said deflection frequency.
Claim 2
Dependent Claim
139 words
A television kinescope deflection arrangement having improved linearity; comprising: a kinescope deflection winding through which an oscillatory current flows at a deflection frequency; first linearity correction capacitance means coupled in series with said deflection winding and responsive to said oscillatory current to form a deflection linearity correction signal; retrace capacitance means coupled in parallel with the serial combination of said deflection winding and said first linearity correction capacitive means; a deflection switch coupled across said retrace capacitance means and operated at said deflection frequency to form recurrent trace and retrace portions of said oscillatory current; energy restoring means coupled to said deflection winding for maintaining said oscillatory current; and a series resonant circuit coupled in parallel with said first linearity correction capacitance means for reducing the flow of said oscillatory current at the second harmonic of said deflection frequency.
Claim 3
Dependent Claim
21 words
A television kinescope deflection arrangement according to claim 1 wherein said series resonant circuit is tuned to said second harmonic frequency.
Claim 4
Dependent Claim
53 words
A television kinescope deflection apparatus according to claim 2 wherein said first linearity correction capacitance means comprises an S-capacitor, said deflection switch comprises a switching transistor paralleled with a diode and said energy restoring means comprises inductance means coupled to a source of energizing potential and to the collector of said switching transistor.
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) | 1982-12-31 | 1983-07-02 | 1984-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-31 | 1987-07-02 | 1988-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-31 | 1991-07-02 | 1992-01-01 | $7700.00 | Window Closed / Lapsed |