Real image type variable magnification finder and imaging...

Details Real image type variable magnification finder and imaging... Real image type variable magnification finder and imaging...

2006-08-01

2006-08-01

Dunn, Drew A. (Department: 2872)

Optical: systems and elements

Compound lens system

Variable magnification

C359S422000, C359S431000

Reexamination Certificate

active

07085048

ABSTRACT:
A real image type variable magnification finder comprises, an object optical system having positive refracting power which forms an objective image as a middle image, a view frame arranged near a position of the middle image, and an eyepiece optical system having positive refracting power which forms a pupil for observing the middle image, wherein an erect image optical surface for making the erect image by bending optical path is formed on the way of these optical paths. The object optical system comprises, in order from an object side, a negative lens element which is a single lens, a positive lens element which is a single lens, wherein both lens elements are moved by changing a distance between the negative lens element and the positive lens element when magnification is varied. The eyepiece optical system comprises a prism which has an entrance surface near the position of the middle image, and a positive lens element which is a single lens, wherein the erect image optical surface is arranged to be divided before and after the middle image position, the total number of lens elements and prism which have refracting power in the whole real image type variable magnification finder system is four, and the lens elements and the prism are composed of plastic.

REFERENCES:
patent: 5323264 (1994-06-01), Kato
patent: 5640632 (1997-06-01), Koyama et al.
patent: 6282381 (2001-08-01), Koyama

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