Real image mode finder optical system

Details Real image mode finder optical system Real image mode finder optical system

1997-06-04

1998-09-01

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359432, 359834, 359837, G02B 2300, G02B 504

Patent

active

058018824

ABSTRACT:
A real image mode finder optical system, situated separate from a photographing optical system, includes an objective system for forming an object image; an optical path splitting member for dividing a finder optical path formed by the objective system into a reflecting optical path and a transmitting optical path; a prism member whose refractive index is greater than 1, disposed on at least one of a surface on the reflection side and a surface on the transmission side of the optical path splitting member; a photometric member disposed on the reflecting optical path; and an eyepiece system situated on the transmitting optical path and disposed behind the optical path splitting member and the prism member. In this way, the real image mode finder optical system having a function for photometry keeps the number of parts to a minimum.

REFERENCES:
patent: 4910545 (1990-03-01), Fujibayashi et al.
patent: 4941012 (1990-07-01), Inabata
patent: 4947198 (1990-08-01), Inanobe et al.
patent: 5126549 (1992-06-01), Yamada
patent: 5231534 (1993-07-01), Kato
patent: 5668919 (1997-09-01), Ito

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