Device for adjusting the diopter setting of a finder assembly

Details Device for adjusting the diopter setting of a finder assembly Device for adjusting the diopter setting of a finder assembly

1992-05-14

1997-04-15

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359676, 359684, 359820, G02B 2300, G02B 1514, G02B 702

Patent

active

056215681

ABSTRACT:
A mechanism for adjusting the diopter setting of a finder assembly which has an objective optical system and an eyepiece optical system, includes an object side image forming position adjusting device which adjusts the position where an image is to be formed by the objective optical system. The mechanism effectively compensates for any change that occurs in the position where an image is formed by the objective optical system due to temperature or humidity variations. Thus, the problem of plastic lenses having their focal lengths extended in a hot and humid environment is solved by the invention.

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patent: 4757336 (1988-07-01), Nakayama et al.
patent: 4779969 (1988-10-01), Sato et al.
patent: 4842395 (1989-06-01), Sato et al.
patent: 4906078 (1990-03-01), Inabata et al.
patent: 5028125 (1991-07-01), Kikuchi
patent: 5117247 (1992-05-01), Nakai et al.
patent: 5191477 (1993-03-01), Abe et al.
patent: 5257129 (1993-10-01), Morooka et al.

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