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Patent Searching and Data


Title:
ENDOSCOPE OBJECTIVE OPTICAL SYSTEM, ENDOSCOPE, AND ENDOSCOPE SYSTEM
Document Type and Number:
WIPO Patent Application WO/2018/220937
Kind Code:
A1
Abstract:
In order to provide an endoscope objective optical system, and endoscope, and an endoscope system that can be compatible with miniaturized implementation and that has good imaging performance with improved on-axis chromatic aberration, an endoscope objective optical system comprises, in order from the object side, a first lens L1 having a negative refractive power, an aperture diaphragm, and a second lens L2 having a positive refractive power, an image-side surface of the first lens L1 being concave toward the image side, an image-side surface of the second lens L2 being convex toward the image side, and the conditional expressions (1), (2), (3), (4), (5), (6), and (7) being satisfied. (1): 0.6 < LL1is/LsL2i < 1.25. (2): -3 < (LL1is/RL1i) × (LsL2i/RL2i) < -1.25. (3): -2 < fL22/(f × fL1) < -1.35. (4): 2 < (nd1 – 1.63) × (νd1 – 31). (5): 5 < (nd2 – 1.45) × (νd2 – 31). (6) 1.63 < nd1 and 31 <νd1. (7): 1.45 < nd2 and 31 <νd2.

Inventors:
IGARASHI Tsutomu (2951 Ishikawa-machi, Hachioji-sh, Tokyo 07, 〒1928507, JP)
Application Number:
JP2018/009232
Publication Date:
December 06, 2018
Filing Date:
March 09, 2018
Export Citation:
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Assignee:
OLYMPUS CORPORATION (2951, Ishikawa-machi Hachioji-sh, Tokyo 07, 〒1928507, JP)
International Classes:
G02B13/04; A61B1/00; A61B1/05; G02B13/18; G02B23/26
Domestic Patent References:
WO2017090342A12017-06-01
WO2015122261A12015-08-20
Foreign References:
JP2009288682A2009-12-10
US20170123191A12017-05-04
JPH05341185A1993-12-24
Attorney, Agent or Firm:
SAITO Keisuke (Surugadai-shita MK Bldg. 6F, 41-3 Kanda-jimbocho 1-chome, Chiyoda-k, Tokyo 51, 〒1010051, JP)
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