Patent US5036258A successfully refreshed from Google Patents.
US5036258A
Expired / Lapsed
US
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Color CRT system and process with dynamic quadrupole lens structure
Assignee: Zenith Electronics LLC
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Filing: 1989-08-11
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Granted: 1991-07-30
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Expires: 2009-08-11
Abstract
Abstract For use in a color cathode ray tube (CRT) having a self-converging yoke for applying an asymmetric magnetic field in a synchronous manner to a plurality of inline electron beams for deflecting the electron beams across a phosphorescing screen in the CRT, wherein the magnetic field causes defocusing of and an astigmatism of the electron beams where incident upon the CRT screen in off-center regions of the screen, an electron gun comprising: a cathode for generating electrons; a beam crossover arrangement for receiving electrons from the cathode and for forming a beam crossover; a first electrostatic quadrupole field aligned in a spaced manner along the electron beams and having a first asymmetric aperture through which the inline electron beams pass for applying a first electrostatic quadrupole field to the electron beams in compensating for the defocusing and astigmatism of the electron beams; and a second electrostatic quadrupole field aligned in a spaced manner along the electron beams with the first electrostatic quadrupole field and having a second asymmetric aperture through which the inline electron beams pass for applying a second electrostatic quandrupole field to the electron beams for further compensating for the defocusing and astigmatism of the electron beams.
Inventors
- 👤 Hsing-Yao Chen
- 👤 Richard M. Gorski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:27
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J29/62; H01J29/626; H01J29/628; H01J29/48; H01J29/50; H01J29/503; H01J29/51; H01J2229/00; H01J2229/48; H01J2229/4834; H01J2229/4837; H01J2229/4841; H01J2229/4844; H01J2229/4848; H01J2229/4858; H01J2229/4865; H01J2229/4872; H01J2229/4879; H01J2229/4893
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
For use in focusing a plurality of electron beams on a screen of a color cathode ray tube, wherein said electron beams are aligned in an in-line array and are deflected across said screen by an asymmetric magnetic field which causes astigmatism of said electron beams, an electron gun comprising: first and third electrodes each adapted to receive a common dynamic voltage and each having for each beam a keyhole-shaped, horizontally oriented opening through which the electron beam passes; a second electrode between said first and third electrodes adapted to receive a fixed voltage and having for each beam a vertically oriented, keyhole-shaped aperture, said first, second and third electrodes, when excited, establishing dynamic quadrupole fields effective to compensate the electron beams for said beam astigmatism.
Claim 2
Dependent Claim
126 words
For use in focusing a plurality of electron beams on a screen of a color cathode ray tube, wherein said electron beams are aligned in an in-line array and are deflected across said screen by an asymmetric magnetic field which causes astigmatism of said electron beams, an electron gun comprising: first and third electrodes each adapted to receive a common dynamic voltage and each having for each beam a keyhole-shaped, horizontally oriented opening through which the electron beam passes; a second electrode between said first and third electrodes adapted to receive a fixed voltage and having for each beam a vertically oriented, keyhole-shaped aperture, said first, second and third electrodes, when excited, establishing dynamic quadrupole fields effective to compensate the electron beams for said beam astigmatism.
Claim 3
Dependent Claim
124 words
For use in focusing a plurality of electron beams on a screen of a color cathode ray tube, wherein said electron beams are aligned in an in-line array and are deflected across said screen by an asymmetric magnetic field which causes astigmatism of said electron beams, an electron gun comprising: first and third electrodes each adapted to receive a common dynamic voltage and each having for each beam a keyhole-shaped, horizontally oriented opening through which the electron beam passes; a second electrode between said first and third electrodes adapted to receive a fixed voltage and having for each beam a circular aperture, said first, second and third electrodes, when excited, establishing dynamic quadrupole fields effective to compensate the electron beams for said beam astigmatism.
Claim 4
Dependent Claim
124 words
For use in focusing a plurality of electron beams on a screen of a color cathode ray tube, wherein said electron beams are aligned in an in-line array and are deflected across said screen by an asymmetric magnetic field which causes astigmatism of said electron beams, an electron gun comprising: first and third electrodes each adapted to receive a common dynamic voltage and each having for each beam a keyhole-shaped, horizontally oriented opening through which the electron beam passes; a second electrode between said first and third electrodes adapted to receive a fixed voltage and having for each beam a circular aperture, said first, second and third electrodes, when excited, establishing dynamic quadrupole fields effective to compensate the electron beams for said beam astigmatism.
Claim 5
Dependent Claim
120 words
For use in focusing a plurality of electron beams on a screen of a color cathode ray tube, wherein said electron beams are aligned in an in-line array and are deflected across said screen by an asymmetric magnetic field which causes astigmatism of said electron beams, an electron gun comprising: first and third electrodes each adapted to receive a common dynamic voltage and having a horizontally elongated slot through which the electron beams pass; a second electrode between said first and third electrodes adapted to receive a fixed voltage and having for each beam a circular aperture, said first, second and third electrodes, when excited, establishing dynamic quadrupole fields to the electron beams effective to compensate for said beam astigmatism.
Claim 6
Dependent Claim
120 words
For use in focusing a plurality of electron beams on a screen of a color cathode ray tube, wherein said electron beams are aligned in an in-line array and are deflected across said screen by an asymmetric magnetic field which causes astigmatism of said electron beams, an electron gun comprising: first and third electrodes each adapted to receive a common dynamic voltage and having a horizontally elongated slot through which the electron beams pass; a second electrode between said first and third electrodes adapted to receive a fixed voltage and having for each beam a circular aperture, said first, second and third electrodes, when excited, establishing dynamic quadrupole fields to the electron beams effective to compensate for said beam astigmatism.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
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