Cathode ray tube with stress-relieved slot-aperture shadow mask

Details Cathode ray tube with stress-relieved slot-aperture shadow mask Cathode ray tube with stress-relieved slot-aperture shadow mask

1977-05-20

1978-12-26

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

29 2517, H01J 2907

Patent

active

041318226

ABSTRACT:
A shadow mask electrode for a line screen cathode ray tube comprises a formed metal sheet having an array of slot-like apertures therein. The apertures are disposed in parallel rows with the apertures elongated in the direction of the rows and separated from adjacent apertures in the same row by webs. An array of discrete surface cavities are provided as holes etched part way through the thickness of the mask. Each cavity is smaller than an aperture of the mask, is laterally spaced from the center-line of an aperture row opposite a web, and extends slightly into the web.

REFERENCES:
patent: 3916243 (1975-10-01), Brown
patent: 4048536 (1977-09-01), Brown

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