Astigmatic focus correction circuit

Details Astigmatic focus correction circuit Astigmatic focus correction circuit

H - Electricity

01

J

355/11

H01J 29/56 (2006.01) H04N 3/233 (2006.01) H04N 3/26 (2006.01) H04N 9/28 (2006.01)

Patent

CA 1041218

ASTIGMATIC FOCUS CORRECTION CIRCUIT ABSTRACT OF THE DISCLOSURE A cathode ray tube employing magnetic deflection coils for deflecting the electron beam in the horizontal and ver- tical 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 deflec- tion 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 Vx2 - Vy2, and the excitation for the second correction coil is proportional to 2 Vx-Vy. -1-

243387

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