Automatic diaphragm control device for TV camera objective

Details Automatic diaphragm control device for TV camera objective Automatic diaphragm control device for TV camera objective

1986-06-17

1988-04-12

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 5238

Patent

active

047378557

ABSTRACT:
An automatic diaphragm control device for a TV camera objective utilizing a video signal from the TV camera includes a circuit for adjustment of a low contrast video signal, a circuit for adjustment of a high contrast video signal and for preventing variations of the low contrast video output signal previously adjustment, a circuit for stabilization of a source voltage used as a power supply, a servo circuit for halting the operation of a servomotor driving said diaphragm in response to the adjusted video signals and a feedback signal from a detecting coil of the servomotor, and for driving the servomotor by supplying a stabilized driving voltage to a driving coil, and a circuit for activating operational amplifiers respectively associated with the adjustment and voltage stabilization circuits.

REFERENCES:
patent: 4409472 (1983-10-01), Kimura
patent: 4427996 (1984-01-01), Tamura
patent: 4609944 (1986-09-01), Nakada et al.

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