Rangefinding device for camera

Details Rangefinding device for camera Rangefinding device for camera

1997-09-05

1999-02-09

Perkey, W. B.

Photography

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

Having auxiliary illumination

396111, 356 303, G03B 1336, G01C 308

Patent

active

058706364

ABSTRACT:
A rangefinding device for a camera, in which a light projecting unit for projecting near-infrared light to an object and a light receiving unit for receiving object-reflected light reflected from an object are provided in such a manner as to be nearly in parallel with each other. The light receiving unit is provided with: a prism having a total reflection surface for reflecting almost all of object-reflected light having been incident thereon; and a light receiving element for receiving object-reflected light that is reflected by this total reflection surface of the prism. Further, the total reflection surface of the prism is formed so that a sum of an angle of incidence and an angle of reflection of object-reflected light reflected by the total reflection surface of this prism is greater than 90.degree. degrees.

REFERENCES:
patent: 4514083 (1985-04-01), Fukuoka

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