Distance measuring device

Details Distance measuring device Distance measuring device

1990-05-08

1991-09-24

Adams, Jr., Russell E.

354408, 354403, G03B 1336

Patent

active

050517678

ABSTRACT:
In a camera provided with a finder and a photographic lens, the focal length of the photographic lens being variable, there is provided a distance measuring device having a pair of optical elements at the front side of the camera, the optical axes of the pair of optical elements being different from the optical axis of the finder, and a line sensor having a pair of image-receiving areas for receiving a pair of images of a photographed object through the pair of optical elements. The respective image-receiving area of the line sensors are selected depending on the focal length of the photographic lens, which corresponds to the range at which an object to be photographed is located. In addition, there is provided an auxiliary light projector for projecting a pattern image to the object to be photographed, the image magnification of which being variable corresponding to the focal length of the photographic lens. Furthermore, the image-receiving areas are divided into a plurality of portions for better measuring the distances of the objects to be photographed, which are located at different depths in a three dimensional field of view.

REFERENCES:
patent: 4506970 (1985-03-01), Fujibayashi
patent: 4636624 (1987-01-01), Ishida et al.
patent: 4812912 (1989-03-01), Iida et al.
patent: 4814810 (1989-03-01), Ishiguro
patent: 4833497 (1989-05-01), Sugawara
patent: 4912495 (1990-03-01), Ishikawa et al.
Japanese publication by M. Misawa et al., "Integrated Circuit for Automatic Focusing", p. 470-473, Fuji Timely, vol. 61, No. 7, (1988).
Japanese Publication by S. Hashiguchi, "Electric Eye", p. 57, Shashin Koguyou (Nov. 1985)
Japanese Publication, "First Look", Chinon Multi-AF Auto 3001, Shashin Koguyou (Nov. 1987).
Japanese Publication, "First Look", Minolta Mac-Tele, p. 28-29 Shashin Koguyou (Jul. 1988).
Abstract of Japanese Publication No. 62-156608.

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