Finder optical system

Details Finder optical system Finder optical system

Filed on

1989-09-13

Date issued

1990-08-28

Examiner

Brown, Brian W.

Other Related Categories

G03B 1308

Type

Patent

Status

active

Patent number

049529560

Description

ABSTRACT:
A finder optical system is provided with a plurality of optical elements, a reflecting surface for indication provided on a surface of one of the plurality of optical elements, a semi-transmissive surface disposed on an object side of the reflecting surface for indication, and an optical member, changing a polarizing state of light, provided between the reflecting surface for indication and the semi-transmissive surface. The semi-transmissive surface is composed of a surface different in reflectivity and transmittance in accordance with a direction of polarization of light. This finder optical system is adapted to image light reflected form the reflecting surface for indication after reflection from the semi-transmissive surface. The finder optical system can provide relatively simple and compact structure and can bring about a bright and easily-viewed visual field in which the generation of ghost and flare is minimized.

REFERENCES:
patent: 2923196 (1960-02-01), Papke
patent: 3053136 (1962-09-01), Ito et al.
patent: 3657985 (1972-04-01), Uno
patent: 4190338 (1980-02-01), Okuno et al.
patent: 4299462 (1981-11-01), Suzuki et al.

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