Pincushion distortion correction apparatus

Details Pincushion distortion correction apparatus Pincushion distortion correction apparatus

H - Electricity

01

J

313/35.313

H01J 29/76 (2006.01) H01F 3/14 (2006.01) H01F 21/08 (2006.01) H01F 29/14 (2006.01) H01J 29/56 (2006.01)

Patent

CA 1175877

ABSTRACT OF THE DISCLOSURE A pincushion distortion correction saturable reactor is a saturable transformer comprising a core having four legs, controlled and control coils coupled to the core legs in a perpendicular relation to each other. The core gap for the controlled coil is provided in an unbalanced form, and a parabolic current at the vertical scanning frequency (for at horizontal scanning frequency) containing a superimposed DC component is supplied through the controlled coil to modulate the inductance of the controlled coil. The inductance of the controlled coil is thus reduced in a region where the magnetomotive force produced by the control coil is greater than that of produced by the control coil to preclude deflectional distortion in the neighborhood of the center of the reproduction on the screen and improve the horizontal linearity.

369169

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