Focus detecting device and method of making same

Details Focus detecting device and method of making same Focus detecting device and method of making same

1988-05-04

1989-10-31

Adams, Russell E.

354406, G03B 300

Patent

active

048780782

ABSTRACT:
In a focus detecting device having a secondary image unit disposed rearwardly of the predetermined imaging plane of an objective lens, a plurality of pairs of object images based on light fluxes passing through different portions of the pupil of the objective lens are formed on a photoelectric conversion element array disposed rearwardly of the secondary imaging unit. The focus of the objective lens is detected from the amount of relative deviation between the object images formed on the photoelectric conversion element array. The secondary imaging unit includes at least two members, a first member having a first pair of lens-acting surfaces and a second pair of lens-acting surfaces on one end thereof, and a second member having a first pair of prism surfaces and a second pair of prism surfaces which differ in refractive power from each other. The second member being fixed to the first member after being rotatively adjusted relative to the first member.

REFERENCES:
patent: 4768052 (1988-08-01), Hamada et al.
patent: 4774539 (1988-09-01), Suda et al.

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