Keplerian zoom finder optical system

Details Keplerian zoom finder optical system Keplerian zoom finder optical system

1991-10-15

1992-09-01

Henry, Jon W.

Optical: systems and elements

Compound lens system

Variable magnification

359422, 359682, 359691, G02B 2314, G02B 15177, G03B 1302

Patent

active

051444801

ABSTRACT:
A Keplerian zoom finder optical system includes an objective lens unit comprising a forward group having negative refractive power and a rearward groups having positive refractive power, the objective lens unit having positive refractive power as a whole and having the magnification changing function of changing the finder magnification by the spacing between the forward group and the rearward group being changed, an eyepiece unit having positive refractive power for enlarging and observing therethrough a spatial image formed by the objective lens unit, and an image erecting optical system for erecting an inverted spatial image formed by the objective lens unit. The forward group in the objective lens unit comprises a first lens having negative refractive power and a positive meniscus-shaped second lens having its convex surface facing the object side, and is designed to have negative refractive power as a whole. The rearward group in the objective lens unit comprises a biconvex third lens, a negative meniscus-shaped fourth lens cemented to the third lens and having its concave surface facing the object side, and a positive meniscus-shaped fifth lens having its convex surface facing the image side, and is designed to have positive refractive power as a whole.

REFERENCES:
patent: 4842395 (1989-06-01), Sato et al.
patent: 4906078 (1990-03-01), Inabata et al.
patent: 5005955 (1991-04-01), Ohshita
patent: 5086363 (1992-02-01), Mukai et al.

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