Electron gun with low spherical aberration

Details Electron gun with low spherical aberration Electron gun with low spherical aberration

1985-09-23

1987-03-10

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313460, H01J 2946, H01J 2956

Patent

active

046493182

ABSTRACT:
An electron gun of uni-potential type is disclosed, which includes a main electron lens system consisting of a front electron lens system formed of a third grid and a fourth grid and a rear electron lens system formed of the fourth grid and a fifth grid of which the electron lens action regions are separated from each other. In this case, the electron lens diameter of the front electron lens system is selected smaller than that of the rear electron lens system, and the aperture diameter of the fifth grid in the rear electron lens system is selected larger than that of the fourth grid, and may be nearly as large as the inner diameter of the tube in which it is placed for use.

REFERENCES:
patent: 2902623 (1959-09-01), Knechtli
patent: 3523205 (1970-08-01), Oess
patent: 4052643 (1977-10-01), Yamazaki et al.
patent: 4178532 (1979-12-01), Fukuzawa et al.
patent: 4271374 (1981-06-01), Kimura

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