Optical system for use in focus detecting apparatus

Details Optical system for use in focus detecting apparatus Optical system for use in focus detecting apparatus

1986-07-25

1987-12-29

Hix, L. T.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 4, G03B 300

Patent

active

047164310

ABSTRACT:
An optical system for use in a focus detecting apparatus comprising a condenser lens disposed at a film equivalent surface or in the vicinity thereof and a pair of splitting optical elements which are disposed behind said condenser lens in a manner symmetrical with respect to the meridional plane of said condenser lens. The focus position is detected by sensing a relative positional mismatch between the images of the object refocused by the respective splitting optical elements. The rear surface of said condenser lens is an ellipsoidal surface which satisfies the relation -1<k<0 when it is expressed by the formula for a quadratic surface: ##EQU1## An auxiliary lens which is coaxial with said condenser lens is disposed just in front of said splitting optical elements.

REFERENCES:
patent: 4500189 (1985-02-01), Aoki
patent: 4552445 (1985-11-01), Mukai et al.
patent: 4573784 (1986-03-01), Suzaki

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