Viewing optical system and imaging apparatus using the same

Details Viewing optical system and imaging apparatus using the same Viewing optical system and imaging apparatus using the same

2011-05-10

2011-05-10

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

Eyepiece

C396S382000

Reexamination Certificate

active

07940466

ABSTRACT:
The invention provides a viewing optical system positioned between a viewing plane as a virtual plane and an eye point. The viewing optical system comprises, in order from the viewing plane side, a cemented lens in which at least one negative lens and at least one positive lens are cemented together and one positive lens, and satisfies the following condition (1).in-line-formulae description="In-line Formulae" end="lead"?−8<r3/f<−0.2  (1)in-line-formulae description="In-line Formulae" end="tail"?Here r3 is the radius of curvature of the lens surface positioned in the cemented lens and nearest to the viewing plane side, and f is the focal length of the whole viewing optical system.

REFERENCES:
patent: 5162945 (1992-11-01), Matsuo et al.
patent: 6529335 (2003-03-01), Fukumoto
patent: 05-215974 (1993-08-01), None
patent: 2006-106491 (2006-04-01), None

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