In-line type electron gun for color cathode ray tube

Details In-line type electron gun for color cathode ray tube In-line type electron gun for color cathode ray tube

1992-11-25

1995-09-19

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, H01J 2962

Patent

active

054518342

ABSTRACT:
An electron gun for use in a color picture tube which can reduce the astigmatism of main electron lenses and to make small circular beam spots. The electron gun has three cathodes each injecting an electron beam respectively and main electron lenses which concentrate the three electron beams onto a fluorescent screen, wherein a third electrode and a fourth electrode consisting the main electron lenses are formed by two large apertured electrodes facing each other and two small apertured electrodes each having three apertures for correcting the astigmatism.

REFERENCES:
patent: 4581560 (1986-04-01), Shirai et al.
patent: 4668892 (1987-05-01), Peels
patent: 5034653 (1991-07-01), Cho et al.
patent: 5142189 (1992-08-01), Sugahara et al.
patent: 5202603 (1993-04-01), Sugawara et al.

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