Color cathode-ray tube

Details Color cathode-ray tube Color cathode-ray tube

1993-10-22

1994-08-09

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, H01J 2907

Patent

active

053369637

ABSTRACT:
In a color cathode-ray tube having a shadow mask disposed to face a phosphor screen and having apertures for passage of an electron beam, and a frame for reinforcing tile periphery of the shadow mask, a magnetic shield comprises strips of magnetic material each having a first end fixed to the frame and a second end disposed closer to the electron gun. Because of the elongated shape, the strips are magnetized easily only in the direction of their length. As a result, an external magnetic field parallel to the strips, and hence with the tube axis, is reduced or canceled. Moreover, if each strip is bent near its second end so that the second end is directed toward a horizontal plane containing the tube axis, an external magnetic field in the direction in which the second end is directed is enhanced. This will further reduce deviation of the electron beam path In the horizontal direction.

REFERENCES:
patent: 4019085 (1977-04-01), Sakata
patent: 4229675 (1980-10-01), Matsuki et al.
patent: 4385256 (1983-05-01), Tokita et al.
patent: 4580076 (1986-04-01), Shimoma et al.
patent: 4858016 (1989-08-01), Suehiro et al.

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