Electron gun having electrodes effective for improving convergen

Details Electron gun having electrodes effective for improving convergen Electron gun having electrodes effective for improving convergen

1990-03-12

1992-01-14

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 420 43, 4205841, H01J 2950

Patent

active

050813935

ABSTRACT:
An electron gun for a color cathode-ray tube has cathodes for producing electron beams and a control electrode unit, a focusing electrode unit and an accelerating unit successively arranged in a direction of the axis of the electron gun. One or more of the above-mentioned electrode units is made of an alloy containing 38-50 Wt % of Ni, 16-20 wt % of Cr and the balance of Fe. This alloy may have a thermal expansion coefficient not higher than about 15.times.10.sup.-6 /.degree.C. and or a relative permeability not higher than about 1.5.

REFERENCES:
patent: 3159480 (1964-12-01), Copson
patent: 4492894 (1985-01-01), Reule et al.
patent: 4631442 (1986-12-01), Reule et al.
patent: 4827178 (1989-05-01), Higashinakagawa et al.

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