Zoom finder optical system

Details Zoom finder optical system Zoom finder optical system

1997-06-19

1999-01-19

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359432, 359676, G03B 1310

Patent

active

058619860

ABSTRACT:
A zoom finder optical system of real image type of the present invention is provided with an objective lens system of a positive refractive power, a condenser lens of a positive refractive power and an eyepiece system of a positive refractive power from an object side. The objective lens system includes from the object side a first lens unit of negative refractive power, a second lens unit of a negative refractive power, a third lens unit of a positive refractive power and a fourth lens unit of a positive refractive power.

REFERENCES:
patent: 4969723 (1990-11-01), Kato et al.
patent: 5034763 (1991-07-01), Inabata
patent: 5148308 (1992-09-01), Miyauchi
patent: 5191477 (1993-03-01), Abe et al.
patent: 5206675 (1993-04-01), Miyauchi et al.
patent: 5257129 (1993-10-01), Morooka et al.
patent: 5359377 (1994-10-01), Kamo
patent: 5410430 (1995-04-01), Ito et al.
patent: 5448411 (1995-09-01), Morooka
patent: 5555431 (1996-09-01), Kim
patent: 5627618 (1997-05-01), Kasai et al.

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