Optical apparatus including a light modulation finder optical sy

Details Optical apparatus including a light modulation finder optical sy Optical apparatus including a light modulation finder optical sy

1995-05-30

1997-09-16

Rutledge, D.

Photography

With exposure objective focusing means, focusing aid, or...

Optical detail with photoelement system

396268, 396271, G03B 1912

Patent

active

056690223

ABSTRACT:
An optical apparatus includes a projection optical system for projecting an object image; a focal detection system for detecting a defocus state of the object image with respect to a photosensitive plane by a light emitted from the projection optical system; a finder system for observing the object by the light emitted from the projection optical system, the finder system being provided with a light modulation unit for creating a light transmission state when electric energy is input and a cutoff state when electric energy is not input, and the light modulation unit being disposed so as to cover the view field of the finder system; and a control unit for controlling input of the electric energy to a light modulation unit, the control unit controlling so as not to input electric energy when the user does not look through the finder system.

REFERENCES:
patent: 4788569 (1988-11-01), Yamada et al.
patent: 5126777 (1992-06-01), Akashi et al.

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