Shutter driving mechanism

Details Shutter driving mechanism Shutter driving mechanism

1987-08-21

1988-10-18

Perkey, W. B.

3542341, G03B 300, G03B 922

Patent

active

047791144

ABSTRACT:
A shutter driving mechanism used in a camera which has a focusing ring rotatable about the optical axis of an objective lens includes a motor driven shutter operating ring rotatable coaxially with the focusing ring. The shutter operating ring and the focusing ring are operationally interconnected with each other by a clutch mechanism which is adapted to disconnect the interconnected rings from each other in response to a focus signal produced by an automatic focus detecting device incorporated in the camera. The focusing ring is rotationally moved by the motor driven shutter operating ring to produce the axial movement of the objective lens in order to position the latter to a proper focus position. The clutch mechanism releases the interconnection between the rings in response to a focus signal produced by an automatic focus detecting device so as to leave the focusing ring at a position where the objective lens is positioned in order to properly focus an image of an object to be photographed on the image plane of the camera, while the shutter operating ring continues to move rotationally for performing the shutter operation.

REFERENCES:
patent: 3274914 (1966-09-01), Biedermann et al.
patent: 3683777 (1972-08-01), Miyagawa
patent: 4634254 (1987-01-01), Ogihara et al.

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