Shadow mask for color cathode ray tube

Details Shadow mask for color cathode ray tube Shadow mask for color cathode ray tube

1991-11-22

1994-01-18

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

H01J 2907

Patent

active

052802159

ABSTRACT:
A shadow mask includes a mask substrate having vertical and horizontal axes passing through a center of the substrate, and a number of substantially rectangular apertures. The apertures are arranged so that a plurality of vertical trains of apertures extending parallel to the vertical axis are arranged at predetermined intervals in the direction of the horizontal axis. Each of the apertures other than the apertures located on the vertical axis has a pair of outer corners distant from the vertical axis, a pair of inner corners less distant from the vertical-axis side, and a pair of bulging portions extending from the outer corners, respectively, outward in the horizontal direction. The farther each of the apertures is located from the vertical axis, the longer the bulging portions extend outward.

REFERENCES:
patent: 4296189 (1981-10-01), Kuzminski
patent: 4518892 (1985-05-01), Thoms
Patent Abstract of Japan, Appln. No. 63-153275, Matsushita Electron Corp., Dec. 26, 1989.
Patent Abstract of Japan, Appln. No. 63-311506, Dainippon Printing Co. Ltd., Mar. 27, 1990.

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