Focus control circuit for CRT

Details Focus control circuit for CRT Focus control circuit for CRT

1993-08-31

1995-02-14

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348345, H01J 2958

Patent

active

053898605

ABSTRACT:
A focus control circuit for a CRT includes a focus bias voltage setting device for setting a focus bias voltage, a bias voltage control device for controlling the focus bias voltage and the focus bias voltage setting device in response to control information, a first amplifier for amplifying a luminance setting voltage with an amplification factor determined by an amplification factor control voltage and for supplying the amplified luminance setting voltage to a transistor, and a resistor network and a second amplifier for dividing a voltage applied to a control grid and applying it to the first amplifier as a control voltage.

REFERENCES:
patent: 4214188 (1980-07-01), Bafaro et al.
patent: 4961031 (1990-10-01), Kakagawa et al.
patent: 5245254 (1993-09-01), Lee

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