Electron beam control electrode for a cathode-ray tube having ex

Details Electron beam control electrode for a cathode-ray tube having ex Electron beam control electrode for a cathode-ray tube having ex

1997-02-28

1999-08-24

Patel, Vip

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313409, 313412, H01J 2946

Patent

active

059428430

ABSTRACT:
The present invention provides a cathode-ray tube provided with an electron gun capable of emitting electron beams of vertically elongate cross section.
A beam control electrode (G2) is fabricated by forming beam passage holes (22R, 22G, 22B) in thin portions (20R, 20G, 20B) of a reduced thickness of an electrode plate (18), and forming excess metal relieving slots (40R to 45B) on the opposite sides of the beam passage holes (22R, 22G, 22B), respectively. An electron gun employing the beam control electrode (G2) is capable of automatically correcting the cross section of beams so that the beams form substantially circular spots in the periphery of a screen. Thus, the deterioration of picture quality attributable to the distortion of the cross section of the beams can be avoided and pictures can be displayed in an improved picture quality.

REFERENCES:
patent: 4272700 (1981-06-01), Collins
patent: 4318026 (1982-03-01), D'Amato
patent: 5061881 (1991-10-01), Suzuki et al.
patent: 5600201 (1997-02-01), Yun et al.

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