Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1992-09-01
1994-06-28
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313414, 313412, 315382, 315 15, H01J 2950, H01J 2946, H01J 2956, H01J 2958
Patent
active
053250133
ABSTRACT:
An improved cathode-ray tube includes a viewing screen and an electron gun for generating and directing three electron beams toward the screen. The gun includes at least eight electrodes spaced in order from three cathodes, with the furthest electrode from the cathodes being interconnected to a tube anode. The electrodes form a beam forming region, a first quadrupole lens, a main focus lens and a second quadrupole lens in the path of each electron beam. In the improvement, the second quadrupole lens is positioned on the anode side of main focus lens, with the first quadrupole lens being diverging for defocusing the beams, and the second quadrupole lens being converging for focusing the beams in the horizontal plane.
REFERENCES:
patent: 4468587 (1984-08-01), Sluyterman
patent: 4935663 (1990-06-01), Shimoma et al.
patent: 5061881 (1991-10-01), Suzuki et al.
patent: 5157130 (1992-10-01), Tominaga et al.
patent: 5241240 (1993-08-01), Chen et al.
patent: 5281892 (1994-01-01), Kweon et al.
SID 1992 Digest, 45.2-"A New Method of Designing a DQL Trinitron Gun to Reduce the Dynamic Focus Voltage", by Y. Iguchi et al., pp. 881-884, Sony Corp., Atsugi, Japan.
Paper presented at IDRC 1991, "Double-Quadrupole DAF For Self-Converging Color CRTS", by H. Suzuki et al., Matsushita Electronics Corp., Osaka, Japan; 1991 IEEE, pp. 31-34.
Johnson Jeffrey P.
New David A.
Esserman Matthew J.
Irlbeck Dennis H.
RCA Thomson Licensing Corporation
Tripoli Joseph S.
Yusko Donald J.
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