Color picture tube having an internal magnetic shield

Details Color picture tube having an internal magnetic shield Color picture tube having an internal magnetic shield

1990-09-11

1992-01-14

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, 313479, H01J 2906, H01J 2994

Patent

active

050813927

ABSTRACT:
A color picture tube includes a faceplate and a funnel attached to the faceplate. The faceplate has a horizontal dimension M.sub.h and a vertical dimension M.sub.v, with the dimensions having a ratio M.sub.h /M.sub.v greater than one. A magnetic shield is located within the tube. The magnetic shield has a front aperture in the proximity of the faceplate and a rear aperture remote from the faceplate. The front aperture has a horizontal dimension F.sub.h and a vertical dimension F.sub.v and the rear aperture has a horizontal dimension R.sub.h and a vertical dimension R.sub.v. The top and bottom of the rear aperature are close to the sides of the funnel and the sides of the rear aperture are spaced from the funnel by a spacing consistent with the entrance of the electron beams at maximum deflection into the shield.

REFERENCES:
patent: 3867668 (1975-02-01), Shrader
patent: 4019085 (1977-04-01), Sakata
patent: 4229674 (1980-10-01), Matsuki et al.
patent: 4513221 (1985-04-01), Robbins
patent: 4580076 (1986-04-01), Shimoma et al.
patent: 4622490 (1986-11-01), Benway
patent: 4758193 (1988-07-01), Brown

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