Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-01-22
1988-10-11
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315405, H01J 2956, H01J 2970
Patent
active
047774118
ABSTRACT:
A top/bottom pincushion correction amplifier has an inhibit terminal that is coupled to vertical deflection means for receiving an inhibit pulse that corresponds to a vertical retrace pulse in the yoke. A vertical amplifier feeds the yoke in series with the secondary winding of a pincushion transformer, the primary winding of which is supplied with a pincushion correction signal from the pincushion amplifier. The effect of the retrace pulse in the yoke in causing ringing in the pincushion transformer is nullified by the inhibit pulse which increases the output impedance of the pincushion amplifier.
REFERENCES:
patent: 3982156 (1976-09-01), Monroe
patent: 4707640 (1987-11-01), Onozawa et al.
O'Connor Edward P.
Oliver Kirk D.
Blum Theodore M.
Issing Gregory C.
Zenith Electronics Corporation
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