Fresnel lens in a finder optical system

Details Fresnel lens in a finder optical system Fresnel lens in a finder optical system

1986-02-19

1988-10-04

Corbin, John K.

350437, G02B 308, G02B 310

Patent

active

047752297

ABSTRACT:
A Fresnel lens provided in the finder of a camera includes a central portion through which an optic axis passes, and a plurality of annular portions spaced apart from the central portion and disposed concentrically. The central portion and the plurality of annular portions have their respective focal lengths. The focal length of the central portion is shorter than the focal length of one of the annular portions which is remotest from the optic axis.

REFERENCES:
patent: 3004470 (1957-07-01), Ruhle

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