Real image mode variable magnification finder

Details Real image mode variable magnification finder Real image mode variable magnification finder

1999-05-28

2000-08-08

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359362, 359431, 359689, G03B 1306, G02B 1514

Patent

active

061010308

ABSTRACT:
A real image mode variable magnification finder has an objective system with positive refracting power, an image erecting optical system for erecting an object image formed by the objective system, and an eyepiece system with positive refracting power. The objective system includes a first lens unit with negative refracting power, a second lens unit with positive refracting power, and a third lens unit with positive refracting power, so that a space between the first lens unit and the second lens unit and a space between the second lens unit and the third lens unit are changed when the magnification of the finder is changed in the range from a wide-angle position to a telephoto position. The image erecting optical system has a first prism and a second prism so that a field frame is interposed between the first prism and the second prism. The finder also satisfies the following condition:

REFERENCES:
patent: 5144349 (1992-09-01), Kato et al.
patent: 5257129 (1993-10-01), Morooka et al.
patent: 5392083 (1995-02-01), Miyazaki et al.
patent: 5552931 (1996-09-01), Kawamura
patent: 5581400 (1996-12-01), Takase et al.
patent: 5627618 (1997-05-01), Kasai et al.
patent: 5757543 (1998-05-01), Ogata
Kubota et al., Optical Technology Handbook, New Edition, Jul. 1995, p. 752.

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