Real-image finder optical system

Details Real-image finder optical system Real-image finder optical system

2005-03-15

2005-03-15

Nguyen, Thong Q (Department: 2872)

Optical: systems and elements

Compound lens system

Variable magnification

C359S422000, C359S431000, C359S643000

Reexamination Certificate

active

06867917

ABSTRACT:
A real-image finder optical system includes a positive objective optical system, an erecting optical system, and a positive eyepiece optical system, thereby an object image, which is formed by the objective optical system, and is upside down and reversed from left to right, is reinverted by the erecting optical system to the proper orientation. The erecting optical system includes a plurality of reflection surfaces, at least one of which is provided along an optical path on the object side with respect to the position where the object image is formed, and at least another of which is provided along an optical path on the eyepiece side with respect to the position where the object image is formed. The eyepiece optical system includes a positive lens element having a transverse magnification of more than 1.0 provided between the object image (finder image) and the reflection surface provided on the eyepiece side with respect to the position where the object image is formed.

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