Photography – With exposure objective focusing means – focusing aid – or... – Optical detail with photoelement system
Patent
1996-12-23
1998-11-17
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Optical detail with photoelement system
396272, G03B 1336
Patent
active
058390014
ABSTRACT:
An apparatus which has a finder optical unit for observing therethrough an image formed by an objective lens, an optical unit for forming a pair of distributions of light quantity on the basis of light beams transmitted through the different pupils of the objective lens, a sensor unit for receiving the pair of distributions of light quantity, a main mirror disposed in an optical path leading to the objective lens and the optical unit for reflecting the light beam from the objective lens to the finder optical unit, and a reflecting mirror having a curved surface having its concave surface facing the light incidence side for reflecting the light beam transmitted through the main mirror in the direction of the optical unit which is opposite to the finder optical unit, and which well makes focus detection possible for a wide field area formed by the objective lens.
REFERENCES:
patent: 4147417 (1979-04-01), Mandler
patent: 4555169 (1985-11-01), Suda et al.
patent: 5212514 (1993-05-01), Goto
Patent Abstracts of Japan, Kuraska Yosuke, Publication, No. 02-143211, published Jan. 1990, for application No. 63-297342, Filed Nov. 1988, "Focus Detecting Device".
Kadohara Terutake
Nagata Keiji
Ohtaka Keiji
Onoda Hitoshi
Suda Yasuo
Canon Kabushiki Kaisha
Perkey W. B.
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