Real image finder

Details Real image finder Real image finder

1997-11-20

1999-07-06

Nguyen, Thong

Optical: systems and elements

Compound lens system

Variable magnification

359431, 359689, G03B 1306

Patent

active

059204281

ABSTRACT:
A real image finder includes an objective lens group, an inverting group and an eyepiece lens group. The objective lens group includes a first lens unit of a negative refractive power, a second lens unit of a positive refractive power, a third lens unit of a positive refractive power, and a first prism of a positive refractive power, where an exit surface of the first prism is convex toward an image. The objective lens group forms an inverted image. The inverting group forms an erect image by inverting the image formed through the objective lens group. The eyepiece lens group magnifies the erect image formed by the inverting group.

REFERENCES:
patent: 5144349 (1992-09-01), Kato et al.
patent: 5231534 (1993-07-01), Kato
patent: 5448411 (1995-09-01), Morooka
patent: 5757543 (1998-05-01), Ogata

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