Eyepiece zoom lens system

Details Eyepiece zoom lens system Eyepiece zoom lens system

1996-06-21

1997-09-02

Epps, Georgia Y.

Optical: systems and elements

Lens

Eyepiece

359644, 359645, 359689, 359432, 359380, 359418, G02B 2500, G02B 1514, G02B 2300, G02B 2100

Patent

active

056638345

ABSTRACT:
In an eyepiece zoom lens having a lens configuration constituted by seven lenses in three groups, predetermined conditional expressions are satisfied so as to realize a zoom ratio of 3 while attaining a sufficient eye relief and ameliorating various kinds of aberration. The first lens group G.sub.1 is made stationary, whereas the second lens group G.sub.2 and the third lens group G.sub.3 are made as movable groups which, when changing the power, respectively move in directions opposite to each other on the optical axis while holding therebetween an object image which is formed between these two lens groups. Further, the eyepiece zoom lens is configured so as to satisfy the following conditional expressions:

REFERENCES:
patent: 2394635 (1946-02-01), Reiss
patent: 3638996 (1972-02-01), Klein
patent: 4501477 (1985-02-01), Sunaga
patent: 4978204 (1990-12-01), Ito
patent: 5162945 (1992-11-01), Matsuo et al.
patent: 5202795 (1993-04-01), Kashima
patent: 5255121 (1993-10-01), Suzuki

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