Cathode ray tube

Details Cathode ray tube Cathode ray tube

1996-07-01

1997-03-25

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 8, H01J 2956

Patent

active

056147910

ABSTRACT:
A cathode ray tube apparatus can accurately, easily and automatically correct influences exerted on both of a beam landing drift and an image distortion drift by terrestrial magnetism applied to a cathode ray tube (CRT). A correction current based on an output of a terrestrial magnetism sensor (45) is supplied to a Z-axis correction coil (41) and an X--X axis correction coil (42). A terrestrial magnetism component (B.sub.H cos.theta.) of Z-axis direction is canceled by a correction magnetic flux generated by the Z-axis correction coil (41), and a terrestrial magnetism component (B.sub.H sin.theta.) of X-axis direction is canceled by the X--X axis correction coil (42), whereby a beam landing drift and a image distortion drift are corrected automatically.

REFERENCES:
patent: 2921226 (1960-01-01), Vasilevskis
patent: 3887833 (1975-06-01), Yamazaki
patent: 4829214 (1989-05-01), Lendaro
patent: 4950955 (1990-08-01), Hoover et al.
patent: 4963789 (1990-10-01), Buhler
patent: 4996461 (1991-02-01), Bentley
patent: 5017832 (1991-05-01), Takita
patent: 5066891 (1991-11-01), Harrold et al.
patent: 5179315 (1993-01-01), Lonoce et al.
patent: 5367221 (1994-11-01), Santy et al.
Patent Abstracts of Japan, vol. 7, No. 251, Nov. 8, 1983, entitled "Dynamically Compensating Circuit of Unnecessary Magnetic Field".

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