Cathode ray display tube having external magnetic shield

Details Cathode ray display tube having external magnetic shield Cathode ray display tube having external magnetic shield

1987-05-01

1989-07-04

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313479, 315 85, 358247, 174 35MS, 2505151, H01J 2906, H01J 2986

Patent

active

048454028

ABSTRACT:
A cathode ray display tube has a magnetic shield comprising a mesh (60) of high permeability magnetic material such as mumetal covering the outer surface of its transparent faceplate (14) through which a display from a screen (16) is visible and which together with a magnetic shielding box (70) surrounding the remainder of the tube's envelope (10) inhibits extraneous magnetic fields entering the envelope and affecting the electron beam undesirably. The shielding arrangement is particularly useful with a flat tube having a relatively large area faceplate and using a low-energy scanning electron beam (32). The mesh (60) may be supported by one or more transparent members (66), and may be treated to enhance contrast of the display and also to act as a electromagnetic radiation shield.

REFERENCES:
patent: 2942254 (1960-06-01), Beers
patent: 4556821 (1985-12-01), Cooper
patent: 4631214 (1986-12-01), Hasegawa
patent: 4661856 (1987-04-01), Schnack
Handbook of Chemistry and Physics (CRC) 1971-1972, p. E108.

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