US3879636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for correcting horizontal pin cushion distortion
Assignee: Thales SA
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Filing: 1973-12-07
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Granted: 1975-04-22
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Expires: 1993-12-07
Abstract
Abstract A circuit arrangement for the correction of horizontal pin cushion distortion in a television receiver includes a main sweep generator having a final stage which feeds the primary winding of a line transformer. The primary winding is connected in series with a capacitor whose one terminal is connected to ground. The final stage includes a switching circuit composed of two circuit components connected in parallel with one another and in series with the primary winding and the capacitor. The switching circuit is open during intervals of the return of the line sweep and closed during the forward line sweep. An auxiliary generator includes a modulator which furnishes a modulated correction voltage at one terminal of a second capacitor. A compensation coil and the horizontal deflection coil are both connected together between the main sweep generator and the auxiliary generator. Correction voltage is applied to the deflection coil and to the compensation coil via an auxiliary transformer whose primary winding is connected, at one end, to the second capacitor and, at its other end, to a parallel network of a first diode and a third capacitor, the first diode making it possible, during forward sweeps, to allow current to flow through the primary winding in one direction. The other end of the primary winding is also operatively connected, via a second diode, which is poled oppositely to the first diode, to the final stage of the main sweep generator in such a manner that current of the primary winding may flow through the final stage during forward sweeps. The parameters of the circuit arrangement are such that the two diodes are non-conducting during return intervals of the line sweep.
Inventors
- 👤 Andre Lamoureux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:17
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/22; H04N3/23; H04N3/237
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
328 words
In a circuit arrangement for correcting horizontal pin cushion distortion of a television receiver or the like, which circuit arrangement includes: (1) a main sweep generator having a final stage which feeds a primary winding of a line sweep transformer, the primary winding being connected in series with a first capacitor whose one terminal is connected to circuit ground, the final stage being provided with a switching circuit means which includes two circuit components connected in parallel with one another and in series with the primary winding and the first capacitor, and the switching circuit means being open during intervals of return of line sweep and closed during forward line sweep; (2) an auxiliary sweep generator including a modulator, which furnishes a modulated correction voltage at a terminal of a second capacitor; (3) a compensation inductor; and (4) a horizontal deflectiOn winding, the inductor and the horizontal deflection winding being connected together between the main sweep generator and the auxiliary sweep generator, the improvement comprising: a second capacitor; a third capacitor; a first diode; a second diode; and an auxiliary transformer having a primary winding and at least one secondary winding for applying a correction voltage from said modulator to said horizontal deflection winding and to said compensation inductor, said primary winding being connected from one of its terminals to said second capacitor and having its second terminal connected to a parallel network composed of said third capacitor and said first diode, which allows current to flow through said primary winding during forward sweeps in one direction, said second terminal of said primary winding also being connected via said second diode, which is opppositely poled with respect to said first diode, to said final stage of said main sweep generator, said second diode allowing current to flow through said primary winding and said final stage in a direction opposite to said one direction, and said first and second diodes both being non-conducting during return intervals of line sweep.
Claim 2
Dependent Claim
328 words
In a circuit arrangement for correcting horizontal pin cushion distortion of a television receiver or the like, which circuit arrangement includes: (1) a main sweep generator having a final stage which feeds a primary winding of a line sweep transformer, the primary winding being connected in series with a first capacitor whose one terminal is connected to circuit ground, the final stage being provided with a switching circuit means which includes two circuit components connected in parallel with one another and in series with the primary winding and the first capacitor, and the switching circuit means being open during intervals of return of line sweep and closed during forward line sweep; (2) an auxiliary sweep generator including a modulator, which furnishes a modulated correction voltage at a terminal of a second capacitor; (3) a compensation inductor; and (4) a horizontal deflectiOn winding, the inductor and the horizontal deflection winding being connected together between the main sweep generator and the auxiliary sweep generator, the improvement comprising: a second capacitor; a third capacitor; a first diode; a second diode; and an auxiliary transformer having a primary winding and at least one secondary winding for applying a correction voltage from said modulator to said horizontal deflection winding and to said compensation inductor, said primary winding being connected from one of its terminals to said second capacitor and having its second terminal connected to a parallel network composed of said third capacitor and said first diode, which allows current to flow through said primary winding during forward sweeps in one direction, said second terminal of said primary winding also being connected via said second diode, which is opppositely poled with respect to said first diode, to said final stage of said main sweep generator, said second diode allowing current to flow through said primary winding and said final stage in a direction opposite to said one direction, and said first and second diodes both being non-conducting during return intervals of line sweep.
Claim 3
Dependent Claim
328 words
In a circuit arrangement for correcting horizontal pin cushion distortion of a television receiver or the like, which circuit arrangement includes: (1) a main sweep generator having a final stage which feeds a primary winding of a line sweep transformer, the primary winding being connected in series with a first capacitor whose one terminal is connected to circuit ground, the final stage being provided with a switching circuit means which includes two circuit components connected in parallel with one another and in series with the primary winding and the first capacitor, and the switching circuit means being open during intervals of return of line sweep and closed during forward line sweep; (2) an auxiliary sweep generator including a modulator, which furnishes a modulated correction voltage at a terminal of a second capacitor; (3) a compensation inductor; and (4) a horizontal deflectiOn winding, the inductor and the horizontal deflection winding being connected together between the main sweep generator and the auxiliary sweep generator, the improvement comprising: a second capacitor; a third capacitor; a first diode; a second diode; and an auxiliary transformer having a primary winding and at least one secondary winding for applying a correction voltage from said modulator to said horizontal deflection winding and to said compensation inductor, said primary winding being connected from one of its terminals to said second capacitor and having its second terminal connected to a parallel network composed of said third capacitor and said first diode, which allows current to flow through said primary winding during forward sweeps in one direction, said second terminal of said primary winding also being connected via said second diode, which is opppositely poled with respect to said first diode, to said final stage of said main sweep generator, said second diode allowing current to flow through said primary winding and said final stage in a direction opposite to said one direction, and said first and second diodes both being non-conducting during return intervals of line sweep.
Claim 4
Dependent Claim
328 words
In a circuit arrangement for correcting horizontal pin cushion distortion of a television receiver or the like, which circuit arrangement includes: (1) a main sweep generator having a final stage which feeds a primary winding of a line sweep transformer, the primary winding being connected in series with a first capacitor whose one terminal is connected to circuit ground, the final stage being provided with a switching circuit means which includes two circuit components connected in parallel with one another and in series with the primary winding and the first capacitor, and the switching circuit means being open during intervals of return of line sweep and closed during forward line sweep; (2) an auxiliary sweep generator including a modulator, which furnishes a modulated correction voltage at a terminal of a second capacitor; (3) a compensation inductor; and (4) a horizontal deflectiOn winding, the inductor and the horizontal deflection winding being connected together between the main sweep generator and the auxiliary sweep generator, the improvement comprising: a second capacitor; a third capacitor; a first diode; a second diode; and an auxiliary transformer having a primary winding and at least one secondary winding for applying a correction voltage from said modulator to said horizontal deflection winding and to said compensation inductor, said primary winding being connected from one of its terminals to said second capacitor and having its second terminal connected to a parallel network composed of said third capacitor and said first diode, which allows current to flow through said primary winding during forward sweeps in one direction, said second terminal of said primary winding also being connected via said second diode, which is opppositely poled with respect to said first diode, to said final stage of said main sweep generator, said second diode allowing current to flow through said primary winding and said final stage in a direction opposite to said one direction, and said first and second diodes both being non-conducting during return intervals of line sweep.
Claim 5
Dependent Claim
61 words
An improved circuit arrangement according to claim 1, wherein one of said two circuit components of said switching circuit means is conductively in circuit with said primary winding when current flows therein in said direction opposite to said one direction, and said third capacitor and said first diode are connected to circuit ground from said second terminal of said primary winding.
Claim 6
Dependent Claim
42 words
An improved circuit arrangement according to claim 1, wherein said primary winding and said secondary winding of said auxiliary transformer are wound on a central leg of a transformer core, said compensation inductor being wound on outside legs of said transformer core.
Claim 7
Dependent Claim
182 words
An improved circuit arrangement according to claim 1, including a transistor, a dissipative load and a fourth capacitor, and wherein said two circuit components of said switching circuit means include a thyristor and a third diode, said main sweep generator includes (1) means for increasing recovery time of the sweep circuit which means comprises a connection between an intermediate tap on said primary winding of said line sweep transformer, (2) a series circuit constituted by said transistor in series with said fourth capacitor which has said dissipative load connected in parallel therewith, and (3) means for assuring unblocking of said transistor during forward sweep, said second diode being connected to said intermediate tap to assure, during forward sweep, current flowing in said direction opposite said one direction, said primary winding of said auxiliary transformer can flow through said transistor and through the parallel circuit constituted by said fourth capacitor and said dissipative load, and said parallel network constituted by said first diode and said third capacitor is connected to circuit ground via the parallel connected said fourth capacitor and said dissipative load.
Claim 8
Dependent Claim
42 words
An improved circuit arrangement according to claim 4, wherein said primary winding and said secondary winding of said auxiliary transformer are wound on a control leg of a transformer core, said compensation inductor being wound on outside legs of said transformer core.
Claim 9
Dependent Claim
28 words
An improved circuit arrangement according to claim 1, wherein said auxiliary transformer applies correction voltages of substantial identical level to both said deflection winding and said compensation inductor.
Claim 10
Dependent Claim
28 words
An improved circuit arrangement according to claim 1, wherein said auxiliary transformer applies correction voltages of relatively different levels to said deflection winding and to said compensation inductor.
Claim 11
Dependent Claim
22 words
An improved circuit arrangement according to claim 7, wherein said secondary winding of said auxiliary winding is provided with an intermediate tap.
Claim 12
Dependent Claim
24 words
An improved circuit arrangement according to claim 7, wherein said at least One secondary winding includes two secondary windings giving respectively different turn ratios.
References Cited (Backward Citations)
US3748531A
Cited
US3803447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |