Patent US4028586A successfully refreshed from Google Patents.
US4028586A
Expired / Lapsed
US
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Parabolic current generator
Assignee: RCA Licensing Corp
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Filing: 1976-02-02
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Granted: 1977-06-07
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Expires: 1996-02-02
Abstract
Abstract A bridge circuit has its input terminals coupled in parallel with an impedance network through which a sawtooth current is passed, the bridge operating to provide an approximate parabolic current through a load coupled to its output terminals. The impedance network includes at least a first impedance coupled in parallel with a series coupled variable second impedance and a third impedance for improving the stability of the parabolic load current.
Inventors
- 👤 Lewis Irwin Mengle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:10
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/20; G06G7/30; H; H03; H03K; H03K4/00; H03K4/04; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H04N9/285
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
An improved parabolic current generator for providing a convergence correction current in a deflection system utilized in a display system, comprising: a deflection generator coupled to a deflection winding for providing an alternating current sawtooth scanning waveform therein; said parabolic current generator including a bridge circuit having its input terminals coupled in series with said deflection winding and its output terminals coupled to a convergence correction winding for providing said parabolic correction current therethrough; said generator further including first and second impedance networks coupled in series with each other and the two of them coupled in parallel with said input terminals of said bridge, said networks each including a first fixed resistance coupled in parallel with a series coupled potentiometer and a second resistance, the junction of said networks being coupled to one of said output terminals of said bridge for allowing separate adjustment of said correction current during each polarity of said alternating current scanning waveforms and for limiting the amount of correction current flowing through said potentiometer.
Claim 2
Dependent Claim
169 words
An improved parabolic current generator for providing a convergence correction current in a deflection system utilized in a display system, comprising: a deflection generator coupled to a deflection winding for providing an alternating current sawtooth scanning waveform therein; said parabolic current generator including a bridge circuit having its input terminals coupled in series with said deflection winding and its output terminals coupled to a convergence correction winding for providing said parabolic correction current therethrough; said generator further including first and second impedance networks coupled in series with each other and the two of them coupled in parallel with said input terminals of said bridge, said networks each including a first fixed resistance coupled in parallel with a series coupled potentiometer and a second resistance, the junction of said networks being coupled to one of said output terminals of said bridge for allowing separate adjustment of said correction current during each polarity of said alternating current scanning waveforms and for limiting the amount of correction current flowing through said potentiometer.
Claim 3
Dependent Claim
44 words
An improved parabolic current generator according to claim 1 wherein said bridge circuit includes a first diode pair, each diode of said first pair poled for conduction in opposite directions and both of said diodes coupled to an output terminal of said bridge circuit.
Claim 4
Dependent Claim
58 words
An improved parabolic current generator according to claim 2 including a second diode pair, the diodes of said second pair coupled in parallel with and poled for conduction in the same direction as the diodes of said first pair, the diodes of said first pair having a different barrier height voltage than the diodes of said second pair.
Claim 5
Dependent Claim
31 words
An improved parabolic current generator according to claim 3 wherein one of said first and second diode pairs is comprised of silicon diodes and the other is comprised of germanium diodes.
References Cited (Backward Citations)
US3930185A
Cited
US3911295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |