Convergence device for color television receiver

Details Convergence device for color television receiver Convergence device for color television receiver

H - Electricity

01

J

350/76.1

H01J 29/51 (2006.01) H04N 9/28 (2006.01)

Patent

CA 1091800

ABSTRACT OF THE DISCLOSURE A convergence device for a color television receiver capable of enlarging part of a color television picture genera- ted 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.

279028

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