Color picture tube having shadow mask assembly

Details Color picture tube having shadow mask assembly Color picture tube having shadow mask assembly

1996-12-27

1998-12-15

Patel, Ashok

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, H01J 2907

Patent

active

058501215

ABSTRACT:
A shadow mask assembly 1 includes a shadow mask 2 of invariable curvature and rotatable by a minimum required amount when the ambient temperature changes. The shadow mask assembly includes a shadow mask 2 having a number of electron beam apertures, a support frame 3 for holding the shadow mask 2, and mask springs 4 for holding the support frame 3 inside a panel of a color picture tube, wherein the shadow mask 2 is made of a metal material composed chiefly of invar, and the support frame 3 and the mask springs 4 are made of low-expansion stainless steel or metal material having a coefficient of thermal expansion of not larger than 1.19.times.10.sup.-5 such as stainless steel whose chromium content is 11% to 16% by weight. In the shadow mask assembly 1 using such metal materials, the curvature at the peripheral edges of the shadow mask 2 does not locally change during the fabrication. A color picture tube provided with the shadow mask assembly 1 does not suffer excessive angular displacement with a change in the ambient temperature.

REFERENCES:
patent: 4698545 (1987-10-01), Inaba et al.
patent: 4716334 (1987-12-01), Fendley et al.
patent: 4748370 (1988-05-01), Van Denbroek
patent: 4827178 (1989-05-01), Higashinakagawa et al.
patent: 4827180 (1989-05-01), Sone et al.
patent: 5347195 (1994-09-01), Seo
patent: 5394052 (1995-02-01), Oh

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