Photography – With exposure objective focusing means – focusing aid – or... – Optical detail with photoelement system
Patent
1996-04-15
1997-04-08
Adams, Russell E.
Photography
With exposure objective focusing means, focusing aid, or...
Optical detail with photoelement system
396128, G03B 1336
Patent
active
056193017
ABSTRACT:
In a focusing state or photographed object distance detector, a pair of distance measuring lenses are arranged in positions symmetrical with respect to the reference axis of a photographing lens. A pair of light-receiving element arrays are arranged behind the pair of distance measuring lenses. A pair of image signals are obtained by controlling operations of the light-receiving element arrays by CCD control sections. A conformity degree between these image signals is calculated by an integral part shifting arithmetic circuit in an element unit of each of the light-receiving element arrays. An interpolating calculation of the conformity degree is made by a decimal part arithmetic circuit to provide a precise conformity degree distribution. When a shifting amount of the pair of image signals is calculated by a shifting amount arithmetic circuit, a distribution portion providing a high conformity degree is greatly weighted by a weighting arithmetic circuit so that the shifting amount is obtained with high reliability.
REFERENCES:
patent: 4816861 (1989-03-01), Taniguchi et al.
patent: 5069543 (1991-12-01), Kitajima et al.
patent: 5113215 (1992-05-01), Nishibe
patent: 5192860 (1993-03-01), Shinohara et al.
patent: 5381206 (1995-01-01), Akashi et al.
Saito Takao
Suzuki Akira
Adams Russell E.
Ricoh & Company, Ltd.
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