Color picture tube having improved corrugated apertured mask and

Details Color picture tube having improved corrugated apertured mask and Color picture tube having improved corrugated apertured mask and

1978-09-08

1980-02-05

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

29 2518, 291635R, 313407, B23P 1516, H01J 914, H01J 2907

Patent

active

041874439

ABSTRACT:
The present invention provides an improvement in an apertured mask type color picture tube having a faceplate, a cathodoluminescent screen on the faceplate, a corrugated apertured mask adjacent the screen and an electron gun means for producing and directing a plurality of electron beams through the mask to impinge upon the screen. The mask is constructed by first forming the apertures therein and thereafter forming the mask in a corrugated shape. Aperture width in the apertured but unformed mask is adjusted to compensate for stretching and compression of the mask occurring during formation of the mask into a corrugated shape. Therefore, the corrugated mask is substantially free of aperture width variation from that desired caused by forming the mask in a corrugated shape.

REFERENCES:
patent: 3600213 (1971-08-01), Arndt
patent: 3909928 (1975-10-01), Sato et al.
patent: 4072876 (1978-02-01), Morrell
patent: 4122368 (1978-10-01), Masterton

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