Keplerian zoom finder optical system

Details Keplerian zoom finder optical system Keplerian zoom finder optical system

1991-10-02

1992-07-21

Henry, Jon W.

Optical: systems and elements

Compound lens system

Variable magnification

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

Patent

active

051328380

ABSTRACT:
In a Keplerian zoom finder optical system including an objective lens unit having a magnification changing function and having positive refractive power, and an eyepiece unit having positive refractive power for enlarging and observing therethrough a real image formed by the objective lens unit, the objective lens unit has, in succession from the object side, a forward from the object side, a forward group comprising a negative first lens and a positive meniscus-shaped second lens having its convex surface facing the object side, and having negative refractive power as a whole, and a rearward group comprising a biconvex positive third lens and a positive meniscus-shaped fourth lens having its convex surface facing the image side, and having positive refractive power as a whole, the spacing between the forward group and the rearward group being changed to thereby accomplish finder magnification change. The objective lens unit is designed to satisfy the following conditions:

REFERENCES:
patent: 4195912 (1980-04-01), Doi et al.
patent: 4579428 (1986-04-01), Fujioka
patent: 5005955 (1991-04-01), Ohshita

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