Color picture tube having reduced picture distortion

Details Color picture tube having reduced picture distortion Color picture tube having reduced picture distortion

1998-07-17

2000-04-04

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, H01J 2950

Patent

active

060465379

ABSTRACT:
In order to increase the horizontal diameter of the lens and reduce the horizontal diameter of the peripheral spot for improving the resolution along the periphery of the phosphor screen of an in-line color picture tube, the focusing grids are so formed that the focusing force of the lens action on low voltage side is weaker in horizontal direction than in vertical direction and the diverging force of the lens action on high voltage side is weaker in horizontal direction than in vertical direction. As a result, the horizontal lens diameter increases, and the horizontal diameter of the peripheral spot is reduced even in the case where the laterally elongated distortion becomes conspicuous due to the increasing trend toward the flattening or the increased deflection angle of the panel.

REFERENCES:
patent: 4429252 (1984-01-01), Vieland et al.
patent: 5034652 (1991-07-01), Shimona et al.
patent: 5142189 (1992-08-01), Sugahara et al.
patent: 5466983 (1995-11-01), Shitai et al.

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