Magnetic focusing device for cathode ray tubes

Details Magnetic focusing device for cathode ray tubes Magnetic focusing device for cathode ray tubes

1992-11-09

1995-03-14

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313442, G09G 104, H01J 2946

Patent

active

053979699

ABSTRACT:
A magnetic focusing device is disposed around the neck of a cathode ray tube. The device comprises a magnetic frame formed by constituent pieces having different magnetic permeabilities and having a gap in a portion thereof radially closest to the neck. A static focusing coil is enclosed in the frame and energized by a direct current. A dynamic focusing coil is energized by a periodically variable current and disposed between the static coil and the neck of the tube. The dynamic focusing coil is disposed near the gap and uses as a magnetic circuit the portion of the frame consisting of the material whose imaginary component of magnetic permeability is the lowest.

REFERENCES:
patent: 4245159 (1981-01-01), Beisswenger
patent: 4912405 (1990-03-01), Richardson

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