Real image type finder optical system

Details Real image type finder optical system Real image type finder optical system

1992-04-09

1993-09-14

Arnold, Bruce Y.

Optical: systems and elements

Compound lens system

359432, 359837, 354219, G02B 2300, G02B 504, G03B 1302

Patent

active

052454690

ABSTRACT:
A real image type finder optical system comprising, in order from the object side, an objective lens, a reticle, a condenser lens and an eyepiece lens. The reticle has a surface of incidence which is located in the vicinity of a plane on which a primary image is to be formed by the objective lens and is configured so as to diffuse a light bundle in different directions by central portion and marginal portion thereof. This finder optical system is capable of forming a sharp image with distortion favorably corrected, has high accuracy for detecting a focused condition and can be composed compactly.

REFERENCES:
patent: 3003387 (1961-10-01), Schiele
patent: 3718078 (1973-02-01), Plummer
patent: 4302089 (1981-11-01), Fukuhara
patent: 4427265 (1984-01-01), Suzuki et al.
patent: 4519686 (1985-05-01), Seki et al.
patent: 4591256 (1986-05-01), Matsumura
patent: 4775229 (1988-10-01), Ichihara et al.

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