Real image type zoom finder

Details Real image type zoom finder Real image type zoom finder

1998-06-16

2000-03-14

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359422, 359431, G02B 2300, G02B 1514

Patent

active

060380691

ABSTRACT:
A real image type zoom finder includes: an objective lens having a plurality of lenses, having a positive refracting power; a field diaphragm provided in the vicinity of a focal point of the objective lens, for defining a viewing field; a structure for erecting an image formed by the objective lens; and an eyepiece having a positive refracting power for enlarging an image formed by the objective lens and the field diaphragm. The objective lens includes at least a first lens group provided closest to an object side, having a negative refracting power, and satisfies the following conditions:

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patent: 5717521 (1998-02-01), Kim
patent: 5757543 (1998-05-01), Ogata
patent: 5784204 (1998-07-01), Kang
patent: 5815312 (1998-09-01), Takato
patent: 5889620 (1999-03-01), Furuta

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