Astigmatic focus correction circuit

Details Astigmatic focus correction circuit Astigmatic focus correction circuit

1975-03-04

1976-06-01

Farley, Richard A.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315382, 315 31R, H01J 2956, H01J 2966

Patent

active

039612236

ABSTRACT:
A cathode ray tube employing magnetic deflection coils for deflecting the electron beam in the horizontal and vertical directions, is corrected for the astigmatism error created by the non-uniform magnetic deflection field which causes a predictable elliptical distortion of the electron beam, through the use of two sets of correction coils mounted on a common annular magnetic core located on the neck of the CRT, which distorts the electron beam prior to its entry into the magnetic deflection field in a manner that is complementary to the distortion created by the non-uniform magnetic deflection field. The excitation currents for the correction coils are derived from the horizontal (Vx) and vertical (Vy) beam deflection voltage signals, in such a manner that the excitation current for the first correction coil is proportional to Vx.sup.2 - Vy.sup.2, and the excitation for the second correction coil is proportional to 2.sup.. Vx.sup.. Vy.

REFERENCES:
patent: 2598303 (1952-05-01), Reinhard
patent: 3753034 (1973-08-01), Spicer
patent: 3879635 (1975-04-01), Findeisen

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