Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1974-10-18
1977-10-11
McGraw, Vincent P.
Optics: measuring and testing
Range or remote distance finding
With photodetection
250201, 250204, 354 4, 354 25, 354163, G01C 308, G03B 1320
Patent
active
040532402
ABSTRACT:
A method and an apparatus is disclosed for detecting the sharpness of the object image suited for optical instruments such as a camera and for adjusting the focus of the optics by means of photoelectric means presenting a non-linear resistance-illumination characteristics such as CdS or CdSe. Such an object image may be formed by means of the optics on the above mentioned photoelectric means presenting the electrodes at both ends along the longer side of a photoelectric semiconductor whose longer side is extremely long as compared with the shorter side as well as on the above mentioned photoelectric means presenting the electrodes at both ends along the shorter side of the photoelectric semiconductor. An object distance measuring system which digitally displays the distance between camera and photographing object when an automatic focusing operation is carried out is also disclosed.
REFERENCES:
patent: 3274913 (1966-09-01), Biedermann et al.
patent: 3364815 (1968-01-01), Smith et al.
patent: 3469925 (1969-09-01), Urbach et al.
patent: 3493764 (1970-02-01), Craig
Aizawa Hiroshi
Hosoe Kazuya
Matsumoto Seiichi
Yokota Hideo
Canon Kabushiki Kaisha
McGraw Vincent P.
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