Distance measuring device for camera

Details Distance measuring device for camera Distance measuring device for camera

1997-02-04

1998-06-02

Adams, Russell E.

Photography

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

Having auxiliary illumination

G03R 1336

Patent

active

057615497

ABSTRACT:
A distance measuring device has a first projecting unit for projecting a first light beam in a direction substantially parallel to a distance measurement axis that connects a distance measuring portion in the angle of view of photograph of a camera, and the object-side principal point of a photograph optical system, a second projecting unit for projecting a second light beam in a direction crossing the distance measurement axis within a predetermined object distance range, a receiving unit arranged to be separated from the first and second projecting units by a given interval to receive light reflected by an object, and a distance detecting circuit for detecting the distance to the object on the basis of the receiving angle or receiving position of the reflected light received by the receiving unit, and the light beam cross section of the second light beam is smaller than that of the first light beam within the object distance range.

REFERENCES:
patent: 3443502 (1969-05-01), Harvey
patent: 4582424 (1986-04-01), Kawabata
patent: 4690538 (1987-09-01), Matsui et al.
patent: 4748469 (1988-05-01), Tamura
patent: 5109161 (1992-04-01), Horiuchi et al.
patent: 5500707 (1996-03-01), Yoshida

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