US3821591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for driving quadripole convergence means
Assignee: RCA Licensing Corp
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Filing: 1973-01-10
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Granted: 1974-06-28
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Expires: 1993-01-10
Abstract
Abstract A circuit for deriving suitably shaped current waveforms, modulated at both a horizontal and a vertical scansion rate, and combining them to energize a quadripole-type convergence winding. Retrace pulses derived from a horizontal output transformer are applied by way of a waveshaping circuit to a first end of the convergence winding. A voltage waveform derived from the vertical deflection current is applied to a rectifier and passed through waveshaping circuitry to provide a vertical-rate current waveform to the convergence winding. The circuitry used for shaping the vertical rate current waveform presents a high impedance to horizontal-rate signals so that no crosstalk between horizontal and vertical deflection systems occurs.
Inventors
- 👤 J Lister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:24
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H04N9/285; H04N3/00; H04N3/10; H04N3/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
210 words
In a color television receiver including a multi-beam cathode ray tube, beam deflection means associated with said cathode ray tube for deflecting the electron beams in a horizontal and a vertical direction, and convergence means for maintaining the relative position of the beams throughout the deflection thereof comprising: a single composite convergence winding disposed adjacent the neck of said cathode ray tube for modifying the relative position of the electron beams as a function of both horizontal and vertical deflection thereof, first means for developing a source of pulses at the horizontal deflection rate, second means for developing a source of pulses at the vertical deflection rate, horizontal waveshaping means responsive to the horizontal rate pulses for imparting a desired configuration thereto, vertical waveshaping means responsive to the vertical rate pulses for imparting a desired configuration thereto, said vertical waveshaping means presenting an impedance to the horizontal rate pulses that is substantially higher than the impedance presented to the vertical rate pulses, means to additively combine the vertical rate shaped pulses with the horizontal rate shaped pulses, and coupling means to supply the combined horizontal and vertical rate pulses to said convergence winding, said coupling means including unidirectional current conducting means to insure unidirectional current flow in said convergence winding.
Claim 2
Dependent Claim
210 words
In a color television receiver including a multi-beam cathode ray tube, beam deflection means associated with said cathode ray tube for deflecting the electron beams in a horizontal and a vertical direction, and convergence means for maintaining the relative position of the beams throughout the deflection thereof comprising: a single composite convergence winding disposed adjacent the neck of said cathode ray tube for modifying the relative position of the electron beams as a function of both horizontal and vertical deflection thereof, first means for developing a source of pulses at the horizontal deflection rate, second means for developing a source of pulses at the vertical deflection rate, horizontal waveshaping means responsive to the horizontal rate pulses for imparting a desired configuration thereto, vertical waveshaping means responsive to the vertical rate pulses for imparting a desired configuration thereto, said vertical waveshaping means presenting an impedance to the horizontal rate pulses that is substantially higher than the impedance presented to the vertical rate pulses, means to additively combine the vertical rate shaped pulses with the horizontal rate shaped pulses, and coupling means to supply the combined horizontal and vertical rate pulses to said convergence winding, said coupling means including unidirectional current conducting means to insure unidirectional current flow in said convergence winding.
Claim 3
Dependent Claim
20 words
The invention defined in claim 1 wherein said horizontal waveshaping means and said vertical waveshaping means include the combining means.
Claim 4
Dependent Claim
58 words
The invention defined in claim 2 wherein said horizontal waveshaping means and said vertical waveshaping means include portions of an electrically continuous winding formed on a common core, said continuous winding having an intermediate point for additively combining the shaped horizontal rate pulses and shaped vertical rate pulses, and said coupling means being connected to said intermediate point.
Claim 5
Dependent Claim
20 words
The invention defined in claim 1 wherein said vertical waveshaping means includes rectifying means to produce undirectional vertical rate pulses.
Claim 6
Dependent Claim
43 words
The invention defined in claim 4 wherein said horizontal waveshaping means includes first inductive means coupled between said first means and said convergence winding, and said vertical waveshaping means includes a second inductive means coupled between said rectifying means and said convergence winding.
Claim 7
Dependent Claim
39 words
The invention defined in claim 5 wherein said secoNd inductive means comprises the primary winding of a raster correction transformer, said raster correction transformer having the secondary winding thereof coupled in electrical circuit relationship with said beam deflection means.
Claim 8
Dependent Claim
24 words
The invention defined in claim 6 wherein said raster correction transformer exhibits a substantially non-linear saturation characteristic when energized by said vertical rate pulses.
Claim 9
Dependent Claim
25 words
The invention defined in claim 7, further including permanent magnetic means associated with said raster correction transformer for varying the saturation characteristic of said transformer.
Claim 10
Dependent Claim
30 words
The invention defined in claim 8, further including unidirectional conducting means coupled between a point of reference potential and the intersection of said rectifying means and said second inductive means.
Claim 11
Dependent Claim
59 words
The invention defined in claim 9, wherein said rectifying means comprises a diode bridge having first, second, third and fourth legs thereof, said first, second and third legs each comprising a single diode, and said fourth leg comprises first and second diodes connected in series circuit relationship, one of said series-connected diodes having a resistor connected in shunt therewith.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |