Photography – With exposure objective focusing means – focusing aid – or... – Optical detail with photoelement system
Patent
1999-07-12
2000-10-03
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Optical detail with photoelement system
396121, G03B 1336
Patent
active
061284440
ABSTRACT:
Disclosed is a multipoint focus detecting apparatus having a plurality of focus detecting zones arranged in a first pattern on a predetermined focal plane around the center thereof, and a corresponding plurality of light receiving elements arranged in a second pattern that is different from the first pattern, a corresponding plurality of light beams which are passed through the plurality of focus detecting zones being made incident on the plurality of light receiving elements, respectively. The plurality of focus detecting zones includes a first focus detecting zone and a second focus detecting zone positioned farther from the center of the predetermined focal plane than the first focus detecting zone. The multipoint focus detecting apparatus includes: a first reflecting member for reflecting a first light beam and a second light beam which are respectively passed through the first focus detecting zone and the second focus detecting zone in directions towards an approximate center of the multipoint focus detecting apparatus; and a second reflecting member for reflecting the first and second light beams reflected by the first reflecting member towards corresponding one and another of the plurality of light receiving elements, respectively. The first reflecting member is positioned at an angle relative to the predetermined focal plane by an angle of more than 45 degrees, and equal to or less than 70 degrees.
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patent: 5692222 (1997-11-01), Yamada et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Perkey W. B.
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