Magnetic field cancellation circuit

Details Magnetic field cancellation circuit Magnetic field cancellation circuit

1990-01-02

1991-11-19

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

335284, H01J 2906

Patent

active

050668919

ABSTRACT:
A magnetic field sensing and canceling circuit for use with a cathode ray tube (CRT) has a closed loop system consisting of flux gate sensors to measure external magnetic fields and magnetic field cancellation coils around the perimeter of the faceplate of the CRT to cancel the fields and thus minimize color and positional ac image distortion. The coils are mounted on an enclosure fabricated of a high permeability material and are positioned around the perimeter of the CRT's faceplate. Four of the coils are parallel to the top, bottom, and sides of the enclosure opening and a fifth coil is wound around the enclosure adjacent the CRT faceplate. The magnetic flux gate sensors provide output signals that are functions of the detected fields. These signals control the current in the magetic field cancellation coils and thus control the cancellation fields.

REFERENCES:
patent: 4963789 (1990-10-01), Buhler
Analysis of the Ring-Core Magnetometer, S. V. Marshall, IEEE Transactions on Magnetics, Sep. 1967, pp. 459-463.
Recent Advances in Fluxgate Magnetometry, D. I. Gordon and R. E. Brown, IEEE Transactions on Magnetics, Mar. 1972, pp. 76-82.

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