Photography – With exposure objective focusing means – focusing aid – or... – Optical detail with photoelement system
Patent
1997-10-01
1999-01-26
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Optical detail with photoelement system
G03B 1336
Patent
active
058647210
ABSTRACT:
There is disclosed a focus detecting apparatus capable of detecting the focus state of an objective lens in a wide viewing field, comprises a view finder optical unit for observing the image formed by the objective lens, an optical unit for forming a pair of optical amount distributions, based on light beams passing through different areas of the pupil of the objective lens, wherein the optical unit being provided, at the light incident side, with a concave face directed to the light incident side, and, at the light exit side, with a convex face directed to the light exit side, a sensor unit for received said pair of the optical amount distributions, a main mirror positioned in the optical path from the objective lens to the optical unit and adapted to reflect the light beams from the objective lens toward the finder optical unit, and a reflecting mirror having a concave curved face directed to the light entrance side and adapted to reflect the light beams, transmitted by the main mirror, in a direction opposite to the finder optical system and toward the optical unit.
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Kadohara Terutake
Nagata Keiji
Ohtaka Keiji
Onoda Hitoshi
Suda Yasuo
Canon Kabushiki Kaisha
Perkey W. B.
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