Photography – With exposure objective focusing means – focusing aid – or... – Dual purpose photoelement
Patent
1997-04-07
1998-06-09
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Dual purpose photoelement
396104, 396124, 396128, G03B 1336
Patent
active
057650543
ABSTRACT:
The invention eliminates field mask eclipse related to a focal detection apparatus that uses a phase variation detection method, and provides an adjustment device and method for the focal detection apparatus. The focal detection apparatus includes a field mask; a separator optical system that divides and forms a set of light images of a beam of light transmitted through the field mask; an image sensor that photoelectrically converts light images from the separator optical system; a light-receiving area memory device; a masking device that masks the photoelectric output of the image sensor according to the light-receiving areas written into the light-receiving area memory device; and a focal computation device that computes a defocusing amount from the photoelectric output masked by the masking device. The adjustment device and method writes into the light-receiving area memory device the light-receiving areas not incurring optical eclipse when uniform illumination is projected onto the image sensor via the field mask and the separator optical system.
REFERENCES:
patent: 5485004 (1996-01-01), Suzuki et al.
patent: 5523553 (1996-06-01), Kusaka et al.
patent: 5615399 (1997-03-01), Akashi et al.
Nikon Corporation
Perkey W. B.
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