Front assembly system for a tension mask color cathode ray tube

Details Front assembly system for a tension mask color cathode ray tube Front assembly system for a tension mask color cathode ray tube

1986-02-21

1987-12-01

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, 313402, H01J 2907, H01J 2902

Patent

active

047106700

ABSTRACT:
A front assembly system for a tension mask color cathode ray tube is disclosed wherein a novel high-voltage conduit is formed between the funnel coating of the tube and the mask to a shadow-mask supporting frame. Also, a magnetic shielding combination is formed comprising an internal magnetic shield and the frame. The magnetic shield effectively extends from the inner surface of the faceplate through the frame and into the funnel a predetermined distance. The frame multi-functionally serves to mechanically support the mask, the shield and the interconnecting means to electrically interconnect the conductive funnel coating, the conductive screen and the mask, and to magnetically interconnect the shield and the mask. The magnetic shielding combination according to the invention is formed by the frame and the shield to enhance the shielding of the electron beams from stray magnetic flux transverse to the tube axis.

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