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Title:
OBJECTIVE OPTICAL SYSTEM, HARD MIRROR OPTICAL SYSTEM USING SAME, AND HARD MIRROR
Document Type and Number:
WIPO Patent Application WO/2018/225268
Kind Code:
A1
Abstract:
Provided are an objective optical system that is compact and yet has a wide angle of view and high resolution, and has corrected lens distortion and chromatic aberration; a hard mirror optical system using the same; and a hard mirror. The objective optical system comprises, in order starting from nearest the object, a first lens having negative refractive power and a second lens having positive refractive power, and satisfies conditional formulas (1) and (2). (1) –3 < (RL1i+RL1o)/(RL1i–RL1o) <–1.3 (2) 30 <νdL1 RL1o is the radius of curvature of the object-side surface of the first lens, RL1i is the radius of curvature of the image-side surface of the first lens, and νdL1 is the Abbe number of the first lens.

Inventors:
UZAWA Tsutomu (2951 Ishikawa-machi, Hachioji-sh, Tokyo 07, 〒1928507, JP)
Application Number:
JP2017/021536
Publication Date:
December 13, 2018
Filing Date:
June 09, 2017
Export Citation:
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Assignee:
OLYMPUS CORPORATION (2951, Ishikawa-machi Hachioji-sh, Tokyo 07, 〒1928507, JP)
International Classes:
G02B13/04; A61B1/00; A61B1/055; G02B13/00; G02B13/18; G02B23/26
Domestic Patent References:
WO2009153953A12009-12-23
Foreign References:
JP2014209190A2014-11-06
JP2016014754A2016-01-28
JPH10133102A1998-05-22
Attorney, Agent or Firm:
SAITO Keisuke et al. (Surugadai-shita MK Bldg. 6F, 41-3 Kanda-jimbocho 1-chome, Chiyoda-k, Tokyo 51, 〒1010051, JP)
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