Color picture tube having improved shadow mask-frame assembly su

Details Color picture tube having improved shadow mask-frame assembly su Color picture tube having improved shadow mask-frame assembly su

1990-03-16

1991-11-05

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, H01J 2907

Patent

active

050633252

ABSTRACT:
The improved color picture tube includes an evacuated glass envelope having a rectangular faceplate panel. The panel includes a shadow mask assembly mounted therein by support means that are located at peripherally spaced positions within the panel. The support means provide compensation for thermal expansion of the shadow mask assembly. The compensation is a movement of the shadow mask assembly toward a screen of the tube as the shadow mask assembly expands. The support means at each of the spaced positions includes a stud attached to the glass envelope, a spring having an aperture therein engaging the stud, and a plate welded between the spring and the shadow mask assembly. The improvement comprises the combination of the spring being angled with respect to the shadow mask assembly to provide approximately half of the required compensation, and the plate being constructed of bimetallic materials and being of appropriate thickness and length to provide the approximately remaining half of the required compensation.

REFERENCES:
patent: 3529199 (1970-09-01), Duistermaat et al.
patent: 3700948 (1972-10-01), Palac
patent: 4317064 (1982-02-01), Dougherty
patent: 4723088 (1988-02-01), Sone et al.
patent: 4728853 (1988-03-01), Sone et al.
patent: 4827180 (1989-05-01), Sone et al.

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