Tensed mask color cathode ray tube and mask support frame theref

Details Tensed mask color cathode ray tube and mask support frame theref Tensed mask color cathode ray tube and mask support frame theref

1985-05-17

1987-04-07

Levy, Stewart J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313477R, 220 21A, H01J 2981

Patent

active

046563881

ABSTRACT:
A tensed mask cathode ray tube has a support frame supporting a tensed mask adjacent to a flat or cylindrical panel wholly within the tube. The support frame includes an outer flange, a shelf extending radially inwardly from the flange and providing a support surface for the tensed mask, and an elongated skirt directed rearwardly from the shelf and adapted to join to the remainder of the CRT. The support frame forms a major part of the CRT envelope and includes strengthening ribs extending from the outer flange to the elongated skirt. The support frame resists deformation by tensile forces exerted by the tensed mask and discontinuity stresses imposed by the flat panel upon tube evacuation. The Q-distance between the mask support surface and the inner surface of the flat panel is determined by the support surface being offset from the seal surface.

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