Drive circuit for pincushion corrector

Details Drive circuit for pincushion corrector Drive circuit for pincushion corrector

1985-12-05

1987-08-11

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

046864300

ABSTRACT:
A video display apparatus includes a diode modulator for correcting side pincushion raster distortion. The diode modulator drive circuit produces a vertical deflection rate parabolic voltage that modulates the horizontal deflection current to effect pincushion correction. The drive circuit includes a transistor that has its base bias established by the combination of a width control resistor and a diode. The diode has the same thermal characteristics as the transistor to provide accurate temperature compensation. A resistor is connected between the emitter of the transistor and a supply voltage to change the transistor bias point in order to enable the transistor to be cutoff.

REFERENCES:
patent: 3649870 (1972-03-01), Maulsby
patent: 4101814 (1978-07-01), Haferl
Markus, Guidebook of Electronic Circuits, 1974, p. 649.

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