External magnetic shield for CRT

Details External magnetic shield for CRT External magnetic shield for CRT

1990-05-29

1993-08-10

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313313, 313402, 315 85, 174 35MS, H01J 3100

Patent

active

052352439

ABSTRACT:
A cathode ray tube has an external magnetic shield adapted for tight fitting positioning upon and about the funnel portion of the CRT. The external magnetic shield includes a shell preferably of conventional plastic and a soft magnetic material having high permeability and low coercivity. The soft magnetic material may be either disposed as a layer on the surface of the shell or distributed throughout the shell in the form of small particles. The external magnetic shield is installed over the CRT funnel following CRT evacuation and frit-sealing for improved magnetic shielding in a low cost, easily assembled magnetic shielding arrangement.

REFERENCES:
patent: 3345537 (1967-10-01), Spencer
patent: 3959152 (1976-04-01), Lill et al.
patent: 4556821 (1985-12-01), Cooper
patent: 4930015 (1990-05-01), Dougherty et al.

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