Keplerian variable magnification finder

Details Keplerian variable magnification finder Keplerian variable magnification finder

1996-02-27

1998-05-26

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359422, 359431, G02B 2300, G02B 2314

Patent

active

057575436

ABSTRACT:
A Keplerian variable magnification finder includes, in order from the object side, an objective system having a positive refracting power as a whole; an image erecting system for erecting an intermediate image formed by the objective system; and an eyepiece system having a positive refracting power as a whole. The objective system including a first lens unit having a negative refracting power; a second lens unit having a positive refracting power; and a third lens unit having a positive refracting power. When the magnification of the finder is changed, the second and third lens units can be moved along the optical axis. The objective system satisfies the following conditions at the same time:

REFERENCES:
patent: 4906078 (1990-03-01), Inabata et al.
patent: 5052787 (1991-10-01), Sugawara
patent: 5144349 (1992-09-01), Kato et al.
patent: 5144480 (1992-09-01), Ohshita
patent: 5231534 (1993-07-01), Kato
patent: 5381265 (1995-01-01), Ohshita
patent: 5576889 (1996-11-01), Miyazaki

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