Camera having solid state diaphragm device

Details Camera having solid state diaphragm device Camera having solid state diaphragm device

1980-07-23

1985-07-02

Adams, Russell E.

G03B 956

Patent

active

045264546

ABSTRACT:
A solid state diaphragm device is constructed by the use of an electrochromie material. Prior to an initiation of a shutter operation, the above-described solid state diaphragm device is supplied with a predetermined amount of driving current flowing in a direction to excite the electrochromie material for production of a color, thereby the size of density of aperture of the diaphragm is adjusted to the aperture information given from the camera body. During the shutter operation, the current supply to said solid state diaphragm device is cut off. After a termination of the shutter operation, an equal amount of current to that of the driving current is allowed to flow in the reversed direction to said solid state diaphragm device, thereby the full open aperture position is regained. The amount of current supplied to said solid state diaphragm device is controlled in accordance with the output of a light metering circuit.

REFERENCES:
patent: 4054890 (1977-10-01), Shimomura

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