Cathode ray tube deflection circuit having display format select

Details Cathode ray tube deflection circuit having display format select Cathode ray tube deflection circuit having display format select

1979-04-16

1980-10-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

340731, H01J 2970, H01J 2976

Patent

active

042309743

ABSTRACT:
A cathode ray tube deflection circuit is described which selects between two display formats in response to a format control signal. A horizontal deflection portion includes the primary winding of a flyback transformer resonant with a horizontal deflection yoke. Switches are connected across a portion of the primary winding and across portions of the yoke. A logic unit, in response to the control signal, actuates each of the switches to change the resonant frequency of the horizontal deflection circuit. The logic unit correspondingly changes the frequency of the horizontal drive signal and the amplitude of the vertical sweep.

REFERENCES:
patent: 3559207 (1971-01-01), Atkinson
patent: 3903517 (1975-09-01), Hafner

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