Shutter and iris combined automatic exposure device

Details Shutter and iris combined automatic exposure device Shutter and iris combined automatic exposure device

1991-12-26

1993-09-14

Perkey, W. B.

354230, 3542341, 354247, G03B 7097, G03B 940

Patent

active

052453804

ABSTRACT:
An automatic exposure device having an exposure sensor and a microprocessor includes a plurality of shuris wings each having a window of a given shape to be movable in respect to each other a motor controlled by the microprocessor for driving the movement of the plurality of shuris wings, an encoder disc for sensing a state of revolution of the motor, a counter for transmitting the state of revolution to the microprocessor by checking an encoder value recorded in the encoder disc, and a ROM table connected to the microprocessor for storing the encoder value and an exposure value corresponding to the encoder value.

REFERENCES:
patent: 4354748 (1982-10-01), Grimes et al.
patent: 5079583 (1992-01-01), Sato et al.

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