Focus circuit

Details Focus circuit Focus circuit

1993-12-15

1995-07-18

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315411, 363 21, H01J 2958

Patent

active

054344859

ABSTRACT:
In a focus circuit for cathode-ray tube (40) of electromagnetic focusing type, a DC voltage (B4) which is made by dividing CRT anode voltage (B3) by a voltage dividing circuit (27) is compared with a reference voltage (B6) by an anode voltage variation component detection circuit (29), thereby to output therefrom a signal (Ve) of anode voltage variation component. This signal (Ve) and static focus adjusting DC voltage (B7) are summed and amplified by an output amplifier 30, which issues a current for correcting focus to electromagnetic focusing coil (31).

REFERENCES:
patent: 4642744 (1987-02-01), Thomas
patent: 4835668 (1989-05-01), Palm et al.

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