Geometry corrector for a cathode ray tube

Details Geometry corrector for a cathode ray tube Geometry corrector for a cathode ray tube

1992-10-14

1993-11-02

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

052586936

ABSTRACT:
A main deflection device of a cathode ray tube generates a main deflection field to deflect an electron beam on the screen of the tube. An auxiliary deflection device located between the main deflection device and the envelope of the tube generates a corrective deflection field to correct geometry errors, for example. The auxiliary deflection device includes a ring core that has a plurality of inwardly pointing projections along the ring and a plurality of associated coils that generate the corrective field. A plurality of adjustable impedances parallels the coils.

REFERENCES:
patent: 4027219 (1977-05-01), Van Alphen et al.

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