Optics: measuring and testing – Range or remote distance finding – Triangulation ranging to a point with one projected beam
Patent
1993-10-18
1999-10-05
Buczinski, Stephen C.
Optics: measuring and testing
Range or remote distance finding
Triangulation ranging to a point with one projected beam
356 301, 356 307, 396106, 396123, G01C 300, G01C 308, G01C 1300
Patent
active
059633093
ABSTRACT:
A distance measuring system of the active type wherein a distance ranging from a short distance to a great distance can be measured with a high degree of accuracy in accordance with a ratio between outputs of two light receiving elements. The system comprises light emitting means which emits light twice to an object, three or more light receiving elements, and selecting means which selects output signals of different pairs of the light receiving elements when the light emitting means emits light for the first and second times for measurement of distances within short and long distance ranges, respectively. The selected output signals in each pair are compared with each other to take a ratio between them, and distances are calculated based on the ratios thus obtained. Finally, a distance to the object is determined based on the calculated two 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: 4303335 (1981-12-01), Matsuda et al.
patent: 4582424 (1986-04-01), Kawabata
patent: 4688919 (1987-08-01), Ogawa et al.
patent: 4748469 (1988-05-01), Tamura
patent: 4849781 (1989-07-01), Nakazawa et al.
"Sashin kougyo" magazine (Photographic Industry), Oct., 1987, issue, pp. 74, 78, 82, 84, 85 and one unnumbered page.
Nakanishi Motohiro
Ootsuka Hiroshi
Buczinski Stephen C.
Minolta Co. , Ltd.
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