Distance detecting apparatus

Details Distance detecting apparatus Distance detecting apparatus

1989-03-03

1991-04-09

Wallace, Linda J.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, G01C 310, G01C 308

Patent

active

050059700

ABSTRACT:
A light projector projects a light pulse upon an object being photographed. A position sensitive detector (PSD) receives reflected light from the object and produces photocurrents which depend on the position of incidence of the light thereon. The detector (PSD) is positioned so that the center of an imaging spot formed by the reflected light from the object when the latter is located at infinity is located toward the projector with respect to the center of PSD. Apparatus additionally comprising a detector circuit which detects the photocurrents produced by PSD as superimposed with bias currents, a calculation and output circuit which calculates and delivers information representing a distance to the object on the basis of photocurrent outputs which are superimposed with the bias currents, and a bias current ratio preset circuit which presets a bias current ratio so that a calculated output is substantially proportional to the reciprocal of the distance to the object over an entire range of distances across which the determination of a distance is enabled.

REFERENCES:
patent: 4274735 (1981-06-01), Tamura et al.
patent: 4490037 (1984-12-01), Anagnostopoulos et al.
patent: 4601574 (1986-07-01), Yamane et al.
patent: 4773751 (1988-09-01), Matsuda et al.
patent: 4849781 (1989-07-01), Nakazawa et al.

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