Lens shutter type of camera

Details Lens shutter type of camera Lens shutter type of camera

1997-01-09

1998-03-31

Perkey, W. B.

Photography

Having variable focal length of camera objective

Having focus operation

396133, 396463, G03B 500, G03B 922, G03B 1336

Patent

active

057349363

ABSTRACT:
A shutter arrangement for a camera which includes a lens shutter, a lens group movable along an optical axis relative to the lens shutter, a first motor for opening or closing the lens shutter, a second motor for moving the lens group along the optical axis, and a first encoder for detecting a size of a diaphragm formed by the lens shutter. The first encoder comprises a first photosensor and a first rotating disk associated with the first photosensor. Also included is a second encoder for detecting an axial position of the lens group which comprises a second photosensor and a second rotating disk associated with the second photosensor. The first and second encoders are positioned to overlap as viewed in a direction of the optical axis.

REFERENCES:
patent: 5122822 (1992-06-01), Morisawa et al.
patent: 5231449 (1993-07-01), Nomura
patent: 5392159 (1995-02-01), Sasaki et al.

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