Focus detecting apparatus and optical apparatus using it

Details Focus detecting apparatus and optical apparatus using it Focus detecting apparatus and optical apparatus using it

1996-01-18

1998-03-17

Metjahic, Safet

Photography

With exposure objective focusing means, focusing aid, or...

Optical detail with photoelement system

396121, G03B 1300, G03B 1334

Patent

active

057297711

ABSTRACT:
The present invention relates to a focus detecting apparatus comprising a field mask disposed near a prescribed image plane of an objective lens and having an aperture offset from the optical axis of the objective lens in order to restrict a field area. A field lens is disposed near the prescribed image plane of the objective lens with a pair of secondary imaging lenses corresponding to the aperture for reimaging an image formed by the objective lens. A stop is disposed adjacent to the pair of secondary imaging lenses and having a pair of apertures for restricting light passing through the pair of secondary imaging lenses. A senor for detecting light quantity; distributions of images formed by the secondary imaging lenses. The pair of secondary imaging lenses are in contact with each other and have different projection shapes on a plane perpendicular to the optical axis of the objective lens.

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