1992-01-28
1993-08-10
Adams, Russell E.
G03B 1336
Patent
active
052353770
ABSTRACT:
According to a measuring apparatus for a camera, light is projected to an object from a projection section, and light reflected on the object is received at a first light receiving section and a second light receiving section arranged to be adjacent to each other. In the first light receiving section, a first and second signals relating to a light receiving position and a quantity of received light are output, and in the second light receiving section, a third signal relating to a quantity of light of the reflected light is output. In a discriminating and calculating section, if it is discriminated that the reflected light is positioned at a place, which is nearer than a predetermined distance, a measuring distance can be calculated from an output ratio of the first signal to the second signal by a measuring calculation circuit. On the other hand, if it is discriminated that the reflected light is positioned at a place, which is farther than the predetermined distance, a measuring distance can be calculated from the output ratio of the sum of the first and second signals to the third signal by the measuring calculation circuit.
REFERENCES:
patent: 4542971 (1985-09-01), Nomata
patent: 4621917 (1986-11-01), Kaneda
patent: 4629882 (1986-12-01), Matsuda et al.
patent: 4849781 (1989-07-01), Nakazawa et al.
Ide Masataka
Nonaka Osamu
Adams Russell E.
Olympus Optical Co,. Ltd.
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