Horizontal output circuit for correcting pin cushion distortion

Details Horizontal output circuit for correcting pin cushion distortion Horizontal output circuit for correcting pin cushion distortion

1987-01-20

1988-03-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H01J 2956

Patent

active

047331410

ABSTRACT:
In a horizontal output circuit for a cathode ray tube, there is included a second resonant circuit combining in parallel a transistor, a damper diode, a resonant capacitor and a series connection of a capacitor and a coil serially connected to a horizontal deflection resonant circuit having a horizontal output transistor, a damper diode, a resonant capacitor, a series connection of an S-shape capacitor and a horizontal deflection coil and a flyback transformer. The constants of the circuits are set so that waveforms of resonant pulses generated by the two resonant circuits becomes similar. A parabolic correction voltage for vertical synchoronization is also applied to the second resonant circuit and the resonant pulse is amplitude-modulated parabolically by the vertical synchronization signal. Therefore, the resonant pulse of the first resonant circuit is amplitude-modulated parabolically with a reverse polarity. A current flowing into the horizontal deflection coil in the first resonant circuit is amplitude-modulated parabolically with a reverse polarity with that of the second resonant circuit and thereby right and left pin cushion distortion of raster can be corrected.

REFERENCES:
patent: 4242714 (1980-12-01), Yoshida et al.
patent: 4254365 (1981-03-01), Knight

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