Shadow mask type color cathode ray tube with shadow mask effecti

Details Shadow mask type color cathode ray tube with shadow mask effecti Shadow mask type color cathode ray tube with shadow mask effecti

1988-12-14

1991-01-08

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313403, 313408, H01J 2981

Patent

active

049838792

ABSTRACT:
A color cathode ray tube which includes an evacuated envelope having a phosphor deposited screen and an electron gun assembly positioned in opposition to the phosphor deposited screen and operable to emit electron beams towards the phosphor deposited screen, and an apertured shadow mask disposed inside the envelope in the vicinity of and generally parallel to the phosphor deposited screen and spaced a predetermined distance from the phosphor deposited screen. The pitch between each of the neighboring apertures in the shadow mask as measured in a vertical direction perpendicular to a horizontal scanning line is chosen to be a value variable as a function of the distance away from the center of the phosphor deposited screen.

REFERENCES:
patent: 3590303 (1971-06-01), Coleclough
patent: 3766419 (1973-10-01), Barbik
patent: 3973159 (1976-08-01), Barten
patent: 4210842 (1980-07-01), Nakayama et al.
patent: 4326147 (1982-04-01), Nakayama et al.
Patent Abstracts of Japan, unexamined application, 57-194437, E field, vol. 7, No. 45, Feb. 23, 1938, p. 2E160.
Patent Abstracts of Japan, unexamined application, 60-243944, E field, vol. 10, No. 104, Apr. 19, 1986, p. 88E 397.
Soviet Inventions Illustrated, SU 1067-547, week 8437, Oct. 24, 1984.
Patent Abstracts of Japan, unexamined application, 55-124930, E field, vol. 4, No. 181, Dec. 13, 1980, p. 121E37.

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