Finder optical system and camera provided with the same

Details Finder optical system and camera provided with the same Finder optical system and camera provided with the same

2006-06-13

2006-06-13

Nguyen, Thong Q (Department: 2872)

Optical: systems and elements

Lens

Eyepiece

C359S643000, C359S362000, C396S373000, C396S384000

Reexamination Certificate

active

07061684

ABSTRACT:
An observation optical system of the present invention comprises an image erect optical system and an eyepiece optical system for observing an object image. The eyepiece optical system comprises a positive single lens having double convex surfaces and a negative meniscus lens having a concave surface directed toward eye point side, and the following condition is satisfied:in-line-formulae description="In-line Formulae" end="lead"?0<S<0.3in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.05<d1/f<0.15in-line-formulae description="In-line Formulae" end="tail"?where S=(r1−r2)/(r1+r2), r1 is a curvature radius of the object image side surface of the negative meniscus lens, r2 is a curvature radius of the eye point side surface of the negative meniscus lens, d1 is a distance of air space between the positive single lens and the negative meniscus lens, which represents a distance of air space when diopter of the observation optical system is adjusted to be −0.8 (m−1) if the air space is changed, and f is a focal length of the eyepiece optical system.

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