Method of extending the life of a cathode ray tube

Details Method of extending the life of a cathode ray tube Method of extending the life of a cathode ray tube

1980-04-21

1982-06-22

Gensler, Paul L.

Electric lamp and discharge devices

Cathode ray tube

Envelope

340720, 354 6, 358220, H01J 3110

Patent

active

043364780

ABSTRACT:
A luminous trace of varying length is produced upon a first non-centralized portion of the screen of a cathode ray tube used in a phototypesetter for generating characters, and is precisely imaged upon positions of a photosensitive medium. The concentration of the electron beam to generate the required trace eventually burns out the phosphor. The life of the tube is greatly extended by thereafter rotating it to position a second non-centralized portion of the screen at the optical projection axis, and so on, and thus, the cathode ray tube life is greatly extended.

REFERENCES:
patent: 2528973 (1950-11-01), Radman
patent: 3517593 (1970-06-01), Overacker
patent: 3599026 (1971-08-01), Tsuneta et al.
patent: 4267555 (1981-05-01), Boyd et al.

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