Magnetic field compensator for a CRT

Details Magnetic field compensator for a CRT Magnetic field compensator for a CRT

1988-09-06

1990-08-21

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315 85, 361150, H01J 2906

Patent

active

049509551

ABSTRACT:
In a television receiver, a magnetic field compensator of a horizontal component of the earth's magnetic field includes a fluxgate magnetometer having a pair of sensing windings for generating first and second sensing signals representative of corresponding components of the horizontal component of the earth's magnetic field. The sensing signals generate current in a pair of substantially planar coils disposed in a non-parallel vertical configuration on the rear periphery of a cathode ray tube. The currents in the coils produce a magnetic field that compensates or neutralizes the effect of the horizontal component of the earth's magnetic field on the electron beam in the cathode ray tube. Whenever the position of the receiver is changed, rotationally or geographically, the current in the coils is automatically adjusted to provide automatic neutralization.

REFERENCES:
patent: 2921226 (1960-01-01), Vasilevskis
patent: 2925524 (1960-02-01), Heil
patent: 4380716 (1983-04-01), Romeo et al.
patent: 4535270 (1985-08-01), Frantz et al.
patent: 4636911 (1987-01-01), Truskalo
patent: 4742270 (1988-05-01), Fernsler et al.
patent: 4760489 (1988-07-01), Truskalo
"Development of a Microcomputer-Based Magnetic Heading Sensor", H. Douglas Garner, presented at the Sensors Expo Conference, Detroit, Sep. 15-17, 1987.

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