Patent US3721930A successfully refreshed from Google Patents.
US3721930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deflection yoke for use with in-line electron guns
Assignee: RCA Licensing Corp
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Filing: 1972-01-14
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Granted: 1973-03-20
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Expires: 1992-01-14
Abstract
Abstract A deflection yoke for a television picture tube utilizing coplanar horizontal in-line electron guns includes vertical and horizontal coil windings selected for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism which underconverges the electron beams along the vertical deflection axis such that the beams are substantially converged at all points on a scanned raster of the picture tube. The desired convergence characteristics are achieved by winding the vertical and horizontal coil conductors such that the conductor distribution in each quadrant of a cross-section of the yoke is least in a region between 25* and 45* measured from the vertical deflection axis of the yoke.
Inventors
- 👤 W Barkow
- 👤 J Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:22
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H04N9/285; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/72; H01J29/76
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a pair of vertical deflection coils and a pair of horizontal deflection coils for deflecting said beams vertically and horizontally, the conductor distribution of said coils being selected for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 2
Dependent Claim
128 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a pair of vertical deflection coils and a pair of horizontal deflection coils for deflecting said beams vertically and horizontally, the conductor distribution of said coils being selected for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 3
Dependent Claim
134 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a ferrite core; a pair of vertical and a pair of horizontal deflection coils toroidally wound around said core for deflecting said beams vertically and horizontally, the conductor distribution of said coils being selected for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 4
Dependent Claim
134 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a ferrite core; a pair of vertical and a pair of horizontal deflection coils toroidally wound around said core for deflecting said beams vertically and horizontally, the conductor distribution of said coils being selected for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 5
Dependent Claim
167 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a ferrite core; a pair of vertical deflection coils and a pair of horizontal deflection coils toroidally wound around said core for deflecting said beams vertically and horizontally, the conductor density distribution in each quadrant of a transverse cross-section of said yoke bounded by the horizontal and vertical deflection axes being least in an angular portion extending between 25* and 45* measured from said vertical deflection axis for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 6
Dependent Claim
167 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a ferrite core; a pair of vertical deflection coils and a pair of horizontal deflection coils toroidally wound around said core for deflecting said beams vertically and horizontally, the conductor density distribution in each quadrant of a transverse cross-section of said yoke bounded by the horizontal and vertical deflection axes being least in an angular portion extending between 25* and 45* measured from said vertical deflection axis for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 7
Dependent Claim
140 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a ferrite core; a pair of saddle-type vertical deflection coils and a pair of saddle-type horizontal deflection coils disposed around the inside of said core for deflecting said beams vertically and horizontally, the conductor distribution of said coils being selected for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 8
Dependent Claim
140 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a ferrite core; a pair of saddle-type vertical deflection coils and a pair of saddle-type horizontal deflection coils disposed around the inside of said core for deflecting said beams vertically and horizontally, the conductor distribution of said coils being selected for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 9
Dependent Claim
167 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a ferrite core; a pair of saddle-type vertical deflection coils and a pair of saddle-type horizontal deflection coils disposed around the inside surface of said core and adapted to be energized for deflecting said beams vertically and horizontally, the active field producing conductor density distribution of a cross-section of said coils being least in an angular portion extending between 25* and 45* from the vertical deflection axis for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 10
Dependent Claim
167 words
A deflection yoke adapted for use in a color image display system in which a picture tube includes an electron gun assembly for producing a plurality of coplanar in-line beams which converge at and are scanned over a raster on the viewing screen of said picture tube, said yoke comprising: a ferrite core; a pair of saddle-type vertical deflection coils and a pair of saddle-type horizontal deflection coils disposed around the inside surface of said core and adapted to be energized for deflecting said beams vertically and horizontally, the active field producing conductor density distribution of a cross-section of said coils being least in an angular portion extending between 25* and 45* from the vertical deflection axis for producing positive vertical isotropic astigmatism and negative horizontal isotropic astigmatism for producing overconvergence of said beams along the vertical deflection axis and underconvergence of said beams along the horizontal deflection axis as observed on the viewing screen of said picture tube as said beams are scanned over said raster.
Claim 11
Dependent Claim
66 words
A deflection coil according to claim 5 wherein each of said coils includes conductors in said region extending between 25* and 45* which are connected separately from conductors in other than said region such that scanning current is bypassed around said conductors in said region between 25* and 45* for producing said least active field producing conductor distribution density in said region between 25* and 45*.
References Cited (Backward Citations)
US3430099A
Cited
US3548350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |