Distance measuring device for use in a camera

Details Distance measuring device for use in a camera Distance measuring device for use in a camera

1981-12-17

1984-08-07

Adams, Russell E.

G03B 300, G03B 1318

Patent

active

044640382

ABSTRACT:
A distance measuring device includes light emitting diode for emitting light toward a subject to be photographed, and a pair of light receiving elements spaced by a predetermined base length from the light receiving diode. The light receiving elements are position side-by-side such that the boundary therebetween extends in a direction which is perpendicular to the direction of the base length so that an image formed by the light emitted to, and reflected from, the subject, will be formed on the light receiving elements in a bridged manner. The respective areas on the light receiving elements occupied by the image differ relative to the distance to the subject. A ratio between the signal levels obtained from the light receiving elements is calculated as a signal representing the distance to the subject.

REFERENCES:
patent: 3813679 (1974-05-01), Hasegawa et al.
patent: 4251144 (1981-02-01), Matsuda et al.
patent: 4313654 (1982-02-01), Matsui et al.

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