Color CRT tension mask support assembly with a glass frame

Details Color CRT tension mask support assembly with a glass frame Color CRT tension mask support assembly with a glass frame

1985-08-20

1987-12-08

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, 313477R, 313479, H01J 2907, H01J 2988

Patent

active

047120410

ABSTRACT:
A front assembly is disclosed for use in a color cathode ray tube. The assembly according to the invention comprises a glass faceplate having a target area with a pattern of phosphor deposits covered with an electron-pervious electrically conductive metallic film. A shadow mask support assembly includes a glass frame sealed to and constituting an integral part of the tube envelope for supporting a shadow mask in precise spaced adjacency to the target area. The frame has an electrically conductive frame coating on at least a portion thereof. An electrically conductive foil shadow mask adapted to be charged with a high voltage is mounted in tension on the frame in electrical contact with a conductive frame coating. Conductive means which may comprise spring means is in contact with the mask or the conductive frame coating and the metallic film or a conductive extension thereof for conducting high voltage on the mask to the metallic film. A funnel has an anode button therethrough for receiving a high voltage, and anode spring means attached to the anode button and having a distal end in contact with the conductive frame coating for conducting the high voltage to the shadow mask. As a result, the high voltage applied to the anode button is conducted to the frame, the foil mask and the metallic film.

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