CRT focus tracking arrangement

Details CRT focus tracking arrangement CRT focus tracking arrangement

1987-10-29

1989-04-25

Moore, David K.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Transformer in the supply circuit

315 3, 315411, 361146, H01J 2970

Patent

active

048251291

ABSTRACT:
A video display apparatus includes a cathode ray tube and a high voltage transformer. The high voltage transformer incorporates a high voltage winding having a tap which provides a focus voltage for the electron gun assembly of the cathode ray tube. The transformer also includes a supply winding which provides power to the electron gun assembly drive circuit. The supply winding is wound to be closely coupled to the portion of the high voltage winding not associated with the generation of focus voltage so that increasing beam current produces nonuniform loading of the high voltage winding.

REFERENCES:
patent: 3813574 (1974-05-01), Sato
patent: 3866086 (1975-02-01), Miyoshi et al.
patent: 3886434 (1975-05-01), Schreiner
patent: 4045707 (1977-08-01), Gernot et al.
patent: 4144480 (1979-03-01), Nagasaki et al.
patent: 4183002 (1980-01-01), Haslau
patent: 4334206 (1982-06-01), Nakamura
patent: 4414578 (1983-11-01), Takeichi
patent: 4549216 (1985-10-01), Yuki

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