Real image mode finder optical system with high magnification

Details Real image mode finder optical system with high magnification Real image mode finder optical system with high magnification

1994-04-05

1996-05-28

Nguyen, Thong Q.

Optical: systems and elements

Lens

Multiple component lenses

359431, 359784, 354225, G02B 914, G02B 2300, G03B 1308

Patent

active

055217613

ABSTRACT:
A real image mode finder optical system includes an objective system having a positive refracting power as a whole, an image erecting system for erecting an image, and an eyepiece system having a positive refracting power. The objective system has a meniscus lens with a negative refracting power, whose convex surface is directed toward the eye, and an objective lens with a positive refracting power. Thus, even when finder magnification is high, a wide field angle can be derived and the distance between the last surface of the eyepiece system and the eyepoint can be ensured in a long range, with a resultant easy observation.

REFERENCES:
patent: 4779969 (1988-10-01), Sato et al.
patent: 4906078 (1990-03-01), Inabata et al.
patent: 4909614 (1990-03-01), Itoh et al.
patent: 4969723 (1990-11-01), Kato et al.
patent: 5144480 (1992-09-01), Ohshita

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