Finder optical system with low-hygroscopic organic material

Details Finder optical system with low-hygroscopic organic material Finder optical system with low-hygroscopic organic material

1994-11-03

1996-12-03

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359362, 359642, 396378, 396386, G03B 1308, G02B 300, G02B 2300

Patent

active

055814000

ABSTRACT:
A finder optical system including an objective system, an image erecting system for erecting an object image formed by the objective system, and an eyepiece system for observing the object image. These systems are constructed of low-hygroscopic organic materials. Thus, the finder optical system can prevent transient variations of optical properties caused by hygroscopicity.

REFERENCES:
patent: 4535026 (1985-08-01), Yoldas et al.
patent: 4779969 (1988-10-01), Sato et al.
patent: 4895433 (1990-01-01), Takahashi et al.
patent: 5144349 (1992-09-01), Kato et al.
patent: 5251069 (1993-10-01), Iizuka

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