Patent US3898521A successfully refreshed from Google Patents.
US3898521A
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US
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Electron beam control system
Assignee: Sony Corp
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Filing: 1974-01-25
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Granted: 1975-08-05
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Expires: 1994-01-25
Abstract
Abstract An electron beam control system for apparatus employing a color cathode ray tube of in-line beam type in which a plurality of electron beam pass through a magnetic field for beam dynamic convergence and are given with deformations of the shape of cross-section thereby, which system includes a magnetic device for producing an additional magnetic field, through which the electron beams pass before arriving at the magnetic field for beam dynamic convergence, for acting on the shape of cross section of the electron beams so as to compensate for the deformation caused by the magnetic field for beam dynamic convergence.
Inventors
- 👤 Tsunenari Saito
- 👤 Yoshio Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:46
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/70; H01J29/701; H01J29/702; H01J29/705; H01J29/48; H01J29/51; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/28; H04N9/285; H01J2229/00; H01J2229/56; H01J2229/568; H01J2229/5681; H01J2229/5687
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
206 words
An electron beam control system for apparatus utilizing a color cathode ray tube comprising: a. a color cathode ray tube having a luminescent screen, beam generating means for emitting a plurality of electron beams to said screen, all of said electron beams being aligned substantially in a common plane, and an electron focus lens disposed between said beam generating means and said screen having a substantially central portion at which said electron beams cross over; b. beam deflecting means disposed between said beam generating means and said screen, said beam deflecting means producing a magnetic field through which said electron beams pass for moving said electron beams in a direction parallel to said common plane, said magnetic field affecting deformation of the cross-sectional shape of each of said electron beams; and c. means for compensating for the cross-sectional shape deformation of each of the electron beams including a magnetic yoke disposed around the substantially central portion of said electron focus lens, said magnetic yoke producing an additional magnetic field through which each of said electron beams pass for acting on the cross-sectional shape of each of said electron beams so as to compensate for the deformation caused by the magnetic field of said beam deflecting means.
Claim 2
Dependent Claim
206 words
An electron beam control system for apparatus utilizing a color cathode ray tube comprising: a. a color cathode ray tube having a luminescent screen, beam generating means for emitting a plurality of electron beams to said screen, all of said electron beams being aligned substantially in a common plane, and an electron focus lens disposed between said beam generating means and said screen having a substantially central portion at which said electron beams cross over; b. beam deflecting means disposed between said beam generating means and said screen, said beam deflecting means producing a magnetic field through which said electron beams pass for moving said electron beams in a direction parallel to said common plane, said magnetic field affecting deformation of the cross-sectional shape of each of said electron beams; and c. means for compensating for the cross-sectional shape deformation of each of the electron beams including a magnetic yoke disposed around the substantially central portion of said electron focus lens, said magnetic yoke producing an additional magnetic field through which each of said electron beams pass for acting on the cross-sectional shape of each of said electron beams so as to compensate for the deformation caused by the magnetic field of said beam deflecting means.
Claim 3
Dependent Claim
59 words
An electron beam control system according to claim 1, wherein said beam deflecting means comprises beam scanning means for deflecting each of said electron beams in the same direction; and dynamic convergence means having a magnetic yoke for producing a magnetic field through which each of said electron beams pass for moving said electron beams for beam dynamic convergence.
Claim 4
Dependent Claim
23 words
An electron beam control system according to claim 2, further comprising static convergence means for statically converging said electron beams on said screen.
Claim 5
Dependent Claim
63 words
An electron beam control system according to claim 3, wherein said beam deformation compensating means produces a magnetic field opposite in polarity with respect to the magnetic field produced by said dynamic convergence means to thereby exert a force on each of said electron beams that is opposite to the force exerted thereon by the magnetic field produced by said dynamic convergence means.
Claim 6
Dependent Claim
21 words
An electron beam control system according to claim 3, wherein said dynamic convergence means is mounted around said static convergence means.
Claim 7
Dependent Claim
29 words
An electron beam control system according to claim 4, wherein a dynamic convergence signal is supplied in common to said dynamic convergence means and said beam deformation compensating means.
References Cited (Backward Citations)
US3462638A
Cited
US3735189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |