Photography – With exposure objective focusing means – focusing aid – or... – Having auxiliary illumination
Patent
1996-02-15
1998-06-23
Metjahic, Safet
Photography
With exposure objective focusing means, focusing aid, or...
Having auxiliary illumination
396110, G03B 300
Patent
active
057714126
ABSTRACT:
A device and a method for focus detection that increases the amount of light projected on an object to capture the object without fail. Light rays are projected onto an object by a projection optical system using a projection pattern film that contains transparent and non-transparent parts, or semi-transparent parts with different light transmission rates. A pair of light rays from the object pass through the shooting lens and are guided onto a photo-electric converter by a focus detection optical system to compose a pair of object images. The focus adjustment state of the shooting lens is detected based on the image defocus amount of the pair of the object images.
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Kobayashi Hirokazu
Kusaka Yosuke
Dalakis Michael
Metjahic Safet
Nikon Corporation
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