Method of degaussing cathode ray tube

Details Method of degaussing cathode ray tube Method of degaussing cathode ray tube

1996-06-07

1998-05-19

Pascal, Robert

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

H01J 2906

Patent

active

057540071

ABSTRACT:
A method of degaussing a cathode ray tube where two pairs of degaussing coils are arranged with one pair located at the top and bottom and the other to the right and left of the cathode ray tube after impaired color purity correction process of an electron beam has been carried out for the cathode ray tube using a magnetization process with a magnetization including an anticipated amount of degaussing for the cathode ray tube when the cathode ray tube is incorporated in a display device. The degaussing of a magnetic material within the cathode ray tube is then carried out with the anticipated amount of degaussing using the degaussing coils. In this way, a color cathode ray tub with no impaired color purity can be provided because the cathode ray trajectories corrected by magnetization in the magnetization process is not easily changed during use after incorporation in the display device.

REFERENCES:
patent: 3588583 (1971-06-01), Ciecierski
patent: 4963789 (1990-10-01), Buhler
Buhler, Frederick T., "Preserving Shadow-Mask CRT Perforance in Strong Magnetic Fields" SID 91 Digest, 1991, pp. 890-893.

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