Exposure controlling device and encoder for camera

Details Exposure controlling device and encoder for camera Exposure controlling device and encoder for camera

1996-12-30

1998-07-14

Mathews, A. A.

Photography

Camera detail

Diaphragm

25023114, G03B 902

Patent

active

057818177

ABSTRACT:
An exposure controlling device includes, an aperture diaphragm that is driven by a motorized driving mechanism to open and close, an encoder for detecting an actuation of the motorized driving mechanism comprising a photocoupler and a rotating disk mounted in connection with the photocoupler. The rotating disk rotates corresponding to the actuation of the motorized driving mechanism by less than one full turn, and the rotating disk has a first angular range where the output signal from the photocoupler does not vary even when the rotating disk rotates and a second angular range where the output signal from the photocoupler varies in cycles in accordance with the rotation of the rotating disk. A controlling unit is provided to control the motorized driving mechanism to drive the aperture diaphragm in accordance with signals received from the photocoupler. The photocoupler faces to the first angular range when the aperture diaphragm is set at an p redetermined initial position.

REFERENCES:
patent: 4557573 (1985-12-01), Johnson et al.
patent: 4699490 (1987-10-01), Kataoka et al.
patent: 4831400 (1989-05-01), Takami et al.
patent: 5113216 (1992-05-01), Murata
patent: 5159192 (1992-10-01), Nishimura et al.
patent: 5202721 (1993-04-01), Kobayashi et al.
patent: 5241172 (1993-08-01), Lugaresi
patent: 5262812 (1993-11-01), Yoshimi
patent: 5331154 (1994-07-01), Kondo et al.
patent: 5557360 (1996-09-01), Kobayashi
Copy of French Search Report, dated Jan. 21, 1998.

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