CONVERGENCE DEVICE FOR COLOR TELEVISION RECEIVER

摘要

A convergence device for a color television receiver capable of enlarging part of a color television picture generated by electron beams focused on a screen, comprising a first horizontal dynamic convergence circuit utilizing a parabolic current waveform to control the convergence of the electron beam; a second horizontal dynamic convergence circuit utilizing a sinusoidal current waveform to control the convergence of the electron beams; a common convergence coil device for applying a time-varying convergence magnetic field to the electron beams; and a switching device for selectively connecting the convergence coil device to (i) the first horizontal dynamic convergence circuit when said picture is not enlarged, and (ii) the second horizontal dynamic convergence circuit when part of the picture is enlarged.