US3930185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Display system with simplified convergence
Assignee: RCA Licensing Corp
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Filing: 1974-05-20
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Granted: 1975-12-30
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Expires: 1994-05-20
Abstract
Abstract A large-screen wide-deflection angle color picture tube utilizes three coplanar electron beams. Convergence of horizontal lines on the picture tube viewing screen is accomplished by positioning a deflection yoke exhibiting particular astigmatism characteristics relative to the electron beams of the picture tube. Convergence of vertical lines is accomplished by energizing quadrupole magnetic field producing windings disposed about the picture tube neck at a vertical scanning rate.
Inventors
- 👤 William Henry Barkow
- 👤 Josef Gross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:12
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/702; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H04N9/285; H01J2229/00; H01J2229/56; H01J2229/563; H01J2229/5637; H01J2229/568; H01J2229/5681; H01J2229/5687
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
222 words
A display system utilizing simplified convergence, comprising: a color picture tube including an electron gun assembly for producing three coplanar beams; static convergence means disposed relative to said picture tube for converging said three beams at the central region of the viewing screen of said picture tube; a deflection yoke disposed in operating relation about the neck portion of said picture tube, said yoke including vertical and horizontal deflection coils for causing said beams to scan a raster, the winding distribution of said horizontal coils selected for producing negative horizontal isotropic astigmatism for substantially converging vertical lines along the horizontal deflection axis and the winding distribution of said vertical coils selected for causing horizontal lines to be substantially parallel; means for positioning said yoke relative to said tube for aligning the magnetic deflection field of said yoke relative to said beams for substantially converging horizontal lines at all points on said screen and for substantially converging vertical lines along the horizontal deflection axis; coil winding portions disposed about the neck portion of said picture tube for producing a quadrupole magnetic deflection field within said neck portion of said tube; and means for energizing said coil winding portions with energy at the vertical scanning rate for converging vertical lines such that said beams are substantially converged at all points on said viewing screen.
Claim 2
Dependent Claim
222 words
A display system utilizing simplified convergence, comprising: a color picture tube including an electron gun assembly for producing three coplanar beams; static convergence means disposed relative to said picture tube for converging said three beams at the central region of the viewing screen of said picture tube; a deflection yoke disposed in operating relation about the neck portion of said picture tube, said yoke including vertical and horizontal deflection coils for causing said beams to scan a raster, the winding distribution of said horizontal coils selected for producing negative horizontal isotropic astigmatism for substantially converging vertical lines along the horizontal deflection axis and the winding distribution of said vertical coils selected for causing horizontal lines to be substantially parallel; means for positioning said yoke relative to said tube for aligning the magnetic deflection field of said yoke relative to said beams for substantially converging horizontal lines at all points on said screen and for substantially converging vertical lines along the horizontal deflection axis; coil winding portions disposed about the neck portion of said picture tube for producing a quadrupole magnetic deflection field within said neck portion of said tube; and means for energizing said coil winding portions with energy at the vertical scanning rate for converging vertical lines such that said beams are substantially converged at all points on said viewing screen.
Claim 3
Dependent Claim
34 words
A display system according to claim 1 wherein said quadrupole field producing means comprises four winding portions symmetrically disposed relative to the respective ends of the vertical and horizontal deflection axes of said yoke.
Claim 4
Dependent Claim
18 words
A display system according to claim 2 wherein said vertical deflection coils are toroidally wound in said yoke.
Claim 5
Dependent Claim
30 words
A display system according to claim 3 wherein said picture tube includes a viewing screen comprised of repeating groups of three different color phosphor strips extending in a vertical direction.
Claim 6
Dependent Claim
28 words
A display system according to claim 4 wherein said means for energizing said quadrupole coil winding portions includes means for producing parabolic waveforms at said vertical scanning rate.
Claim 7
Dependent Claim
41 words
A display system according to claim 5 wherein said vertical deflection coils have the winding distribution thereof selected for producing a magnetic field which overconverges said beams along vertical lines in the absence of current in said quadrupole coil winding portions.
Claim 8
Dependent Claim
19 words
A display system according to claim 6 wherein said quadrupole windings are energized at the vertical deflection rate only.
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) | 1978-12-29 | 1979-06-30 | 1979-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-29 | 1983-06-30 | 1983-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-29 | 1987-06-30 | 1987-12-30 | $7700.00 | Window Closed / Lapsed |