Color picture tube having improved shadow mask-frame...

Details Color picture tube having improved shadow mask-frame... Color picture tube having improved shadow mask-frame...

H - Electricity

01

J

313/35.166

H01J 29/07 (2006.01)

Patent

CA 2038224

ABSTRACT An 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 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 having appropriate thickness and length to provide the approximately remaining half of the required compensation.

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