Television deflection distortion correcting circuit

Details Television deflection distortion correcting circuit Television deflection distortion correcting circuit

1994-01-27

1995-05-30

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

054204836

ABSTRACT:
In an upper and lower pincushion distortion correcting circuit, so-called "cloak distortion" and "vertical intermediate-pincushion distortion" are corrected. A variable voltage source is connected to one end of a secondary winding of a transformer magnetically coupled with a primary winding thereof series-connected to a vertical deflection coil. A capacitor is connected between the other end of the secondary winding and the ground, and a series circuit constructed of a coil and a switch is connected in parallel to this capacitor. The so-termed "cloak distortion" is corrected by varying a resonance frequency of a sawtooth-shaped voltage in the horizontal scanning period, while an ON-period of the switch is controlled. Also, the "vertical intermediate-pincushion distortion" is corrected by varying an S-value of the sawtooth-shaped voltage in the vertical scanning period, while the source voltage of the variable voltage source is changed.

REFERENCES:
patent: 4024432 (1977-05-01), Boekhorst
patent: 4777411 (1988-10-01), O'Connor et al.
patent: 4988927 (1991-01-01), Spruck
patent: 5260628 (1993-11-01), Kawaberi et al.

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