Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1986-12-23
1988-08-30
Perkey, W. B.
Optics: measuring and testing
Range or remote distance finding
With photodetection
356 4, G03B 300, G01C 308
Patent
active
047680539
ABSTRACT:
A distance measuring apparatus of the present invention converges the reflected light on objects through a converging lens and detects the light by a multi-divisional photodiode. The multi-divisional photodiode comprises a plural number of light receiving elements so that each of the light receiving elements detects the reflected light from the corresponding object to provide an electric signal according to the quantity of reflected light. The quantity of light in the peripheral portions of the flash or the converging lens is inherently smaller than the quantity of light in the central portion thereof. This distance measuring apparatus is improved so that a constant electric signal is obtained by any of the light receiving elements as far as the distance to the objects is constant. For example, such improvement is made in a manner in which: the quantity of received light of the central portion is limited by a filter provided between the converging lens and the multi-divisional photodiode; the light receiving areas of the light receiving elements are increased in peripheral portions of the multi-divisional photodiode compared with those in the central portion thereof; or the obtained electric signal is electrically corrected.
REFERENCES:
patent: 3747488 (1973-07-01), Bennett
patent: 4306787 (1981-12-01), Fukuhara et al.
patent: 4349257 (1982-09-01), Friedman et al.
patent: 4415245 (1983-11-01), Harvey
patent: 4420252 (1983-12-01), Nakauchi
patent: 4423936 (1984-01-01), Johnson
patent: 4500189 (1985-02-01), Aoki
patent: 4670645 (1987-06-01), Ohtaka et al.
Matsuda Motonobu
Nakanishi Motohiro
Ootsuka Hiroshi
Tanaka Yoshihiro
Taniguchi Nobuyuki
Minolta Camera Kabushiki Kaisha
Perkey W. B.
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