Color cathode ray tube

Details Color cathode ray tube Color cathode ray tube

1998-09-04

2000-09-26

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313426, 313427, 313442, 335210, H01J 2970

Patent

active

061246697

ABSTRACT:
A pair of first magnetic bodies extending in a direction of an X-axis are so disposed as to be opposed to each other on the X-axis in order to shield an external magnetic field acting on three electron beams lined side by side in the direction of X-axis. A pair of arcuated second magnetic bodies are disposed symmetric with respect to the X-axis in the vicinity of a Y-axis at a predetermined distance from a ring-shaped six-pole magnet plate. The first magnetic bodies, second magnetic bodies and six-pole magnet plate are arranged in this positional relationship, whereby a predetermined magnetic field distribution is created. Cathodes of an electron gun structure are arranged in such a position that a sum of a positive magnetic field component is substantially equal to a sum of.the negative magnetic field component on the trajectory of a center beam. Thereby, a force component acting on the center beam can be reduced without reducing force components acting on both side beams, and undesirable movement of the center beam can be prevented.

REFERENCES:
patent: 4670726 (1987-06-01), Ogata et al.
patent: 5557164 (1996-09-01), Chen et al.
patent: 5708323 (1998-01-01), Okamoto

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