Cathode ray tube with multiple internal graticules

Details Cathode ray tube with multiple internal graticules Cathode ray tube with multiple internal graticules

1979-10-26

1981-08-11

Karlsen, Ernest F.

Electric lamp and discharge devices

Cathode ray tube

Screen

324115, 324121R, H01J 2934, G01R 1320

Patent

active

042836557

ABSTRACT:
A cathode-ray tube for a multipurpose test and measurement or information display instrument is provided with multiple internal graticules. One of the graticules is permanently visible and functional at all times the instrument is in operation. Another of the graticules is formed in a manner such that it is not easily visible in normal ambient lighting conditions alone, but becomes plainly visible when edge lighted by suitable means.

REFERENCES:
patent: 3274421 (1966-09-01), Johnson
patent: 3683225 (1972-08-01), Butler

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