Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1996-09-03
1998-06-02
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 14, 313414, H01J 2958
Patent
active
057605505
ABSTRACT:
An in-line color picture tube compensates for the distortion in the illuminated spot at the peripheral portion of the screen in a horizontally oblong shape. In particular, with an increase in the beam diameter under large current, or flattening of the panel or increase in the deflection angle, the beam distorted easily. However, such distortion is made to be small by providing a quadrupole lens with strong power. The in-line color picture tube has an electron gun comprising three cathodes that are in-line arranged in horizontal direction, a control electrode, an accelerating electrode and a focusing electrode system. The focusing electrode system comprises a couple of focusing electrodes having the facing portion on which non-circular beam through holes are provided. A predetermined focus voltage is applied to the first focusing electrode. A voltage changing in accordance with a deflection angle of the beam is applied to the second focusing electrode. A beam through holes that are oblong vertically are provided on the control electrode facing the cathode; and the beam through holes that are oblong horizontally are provided on the control electrode facing the accelerating electrode.
REFERENCES:
patent: 4366414 (1982-12-01), Hatayama et al.
patent: 4814670 (1989-03-01), Suzuki et al.
patent: 4886999 (1989-12-01), Yamane et al.
patent: 5061881 (1991-10-01), Suzuki et al.
patent: 5128586 (1992-07-01), Ashizaki et al.
patent: 5281892 (1994-01-01), Kweon et al.
patent: 5300855 (1994-04-01), Kweon
patent: 5434471 (1995-07-01), Jeong
patent: 5483128 (1996-01-01), Chen
JP-A 06-068812 (Mar. 11, 1994), Patent Abstracts of Japan, vol. 18, No. 308, Jun. 13, 1994.
Yamane, et al., An in-Line Color CRT With Dynamic Bea m Shaping For Data Display, Proceedings of the Society for Information Display (SID), vol. 29, No. 1, 1988, pp. 41-45.
Sukeno Masahiko
Watanabe Takashi
Blum Theodore M.
Matsushita Electronics Corporation
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