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

1989-12-06

1991-06-11

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313413, 313449, H01J 2951

Patent

active

050235087

ABSTRACT:
An in-line type electron gun for a cathode ray tube includes a cathode, a control grid, a screen grid, and a main lens including a final focus electrode and an anode forming a major lens, at least one of the focus electrode and anode including a first member with three independent beam passing holes disposed at a beam passing plane thereof and a second member with a common beam passing hole disposed at a beam passing plane thereof, the beam passing planes being separated from each other by a fixed distance. According to the present invention, electron beam control errors originating from manufacturing errors can be reduced to a great degree. The electron gun of the present invention is simple and convenient to manufacture with a low product defect rate.

REFERENCES:
patent: 4443736 (1984-04-01), Chen
patent: 4558253 (1985-12-01), Bechis et al.
patent: 4583024 (1986-04-01), Chen
patent: 4678964 (1987-07-01), Peels
patent: 4728859 (1988-03-01), Natsuhara et al.

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