Distance measuring system

Details Distance measuring system Distance measuring system

1990-12-21

1993-03-02

Buczinski, Stephen C.

Optics: measuring and testing

Range or remote distance finding

With photodetection

354403, G01C 300, G01C 500

Patent

active

051913844

ABSTRACT:
A distance measuring system of the active type for measuring a distance ranging from a short distance to a long distance with a high degree of accuracy. The system comprises light emitting means, three or more light receiving elements, and a selecting means for selecting output signals of different selected pairs of light receiving elements when the light emitting means emits light for first and second times for measuring distances within short and long distance ranges, respectively. The output signals in each selected pair are compared with one another to obtain ratios between them, and distances are calculated based on the ratios thus obtained. A distance to the object is then determined based on the calculated distances. Where the distance measuring system is incorporated in a camera, the lens of the camera is actuated in accordance with the distance value measured by the system.

REFERENCES:
patent: 4582424 (1986-04-01), Kawabata
patent: 4688919 (1987-08-01), Ogawa et al.
patent: 4748469 (1988-05-01), Tamura

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