Color picture tube and in-line electron gun with focusing electr

Details Color picture tube and in-line electron gun with focusing electr Color picture tube and in-line electron gun with focusing electr

1997-05-22

1998-05-05

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313427, H01J 2950, H01J 2970

Patent

active

057479224

ABSTRACT:
In a color picture tube having a wide and flat screen, one set of in-line three electron beam through holes on an end face of a first focusing electrode facing a second focusing electrode are formed with a vertically oblong rectangular shape, and the other set of in-line three electron beam through holes on an end face of the second focusing electrode facing the first focusing electrode are formed with a horizontally oblong rectangular shape, a pair of protrusions is provided on a pair of longer sides of each of the electron beam through holes. Therefore, intensive quadrupole fields, by which deflection distortion can be cancelled, can be generated. Fluctuation of the quadrupole fields due to interference of a dynamic voltage and focusing voltage, which are to be applied to the focusing electrodes, can be prevented.

REFERENCES:
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: 5281892 (1994-01-01), Kweon et al.
patent: 5300855 (1994-04-01), Kweon
patent: 5434471 (1995-07-01), Jeong
Copy of European Search Report dated Jan. 9, 1996.
"An In-Line Color CRT With Dynamic Beam Shaping For Data Display," H. Yamane et al., Proceedings of the Society for Information Display (SID), vol. 29, No. 1, 1988, pp. 41-45.
JP-A-06 068812 (11 Mar. 1994), Patent Abstracts of Japan, vol. 18, No. 308, 13 Jun. 1994.

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