Dynamic focus circuit

Details Dynamic focus circuit Dynamic focus circuit

1984-11-30

1986-05-06

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358218, H01J 2958

Patent

active

045874654

ABSTRACT:
A dynamic focus circuit for a television display picture tube provides a focus voltage having scan rate modulation. The parabolically shaped voltage which is produced across the S-shaping capacitor in a deflection system is coupled by a transformer having a primary winding coupled between the junction of the S-shaping capacitor and the deflection winding and a power supply point having substantially the same average DC potential. Substantially no DC current flows through the transformer primary winding, which permits a relatively small transformer to be used without saturation of the magnetic core and without the need for a coupling capacitor for DC isolation.

REFERENCES:
patent: 2918602 (1959-12-01), Fyler et al.
patent: 3146373 (1964-08-01), Janssen
patent: 4316128 (1982-02-01), Shiratsuchi
patent: 4460851 (1984-07-01), Bistline et al.
Electrical Schematic of a Sony Color Television Receiver, Model KV-1813.

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