Low level pincushion correction circuit

Details Low level pincushion correction circuit Low level pincushion correction circuit

1974-11-04

1976-11-30

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315371, 315395, H01J 2956

Patent

active

039951960

ABSTRACT:
A television receiver includes circuitry for processing a received signal and displaying video information therein upon the viewing screen of a cathode ray tube. Conventional horizontal and vertical deflection circuitry provide the required scanning signals. A center tapped winding on the receiver's horizontal output transformer is coupled to a pair of oppositely oriented diodes which are coupled to a common load. A vertical trace or scan signal is applied to both diodes, alternately switching them on during the vertical scan interval. The respective portions of vertical scan signal coupled by each diode are serrated in response to the applied horizontal retrace pulses and when combined in the common load form a train of horizontal frequency pulses having first and second portions at opposite polarities and an envelope corresponding to the vertical scan signal. An amplifier, having a collector load tuned to the horizontal scan frequency, is coupled to the common load and produces a "bow-tie" signal which is applied to the receiver's vertical deflection amplifier for top and bottom pincushion correction.

REFERENCES:
patent: 3440482 (1969-04-01), Lister et al.
patent: 3700958 (1972-10-01), Haferi

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