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Title:
STEREOSCOPIC OBJECTIVE OPTICAL SYSTEM FOR ENDOSCOPE AND ENDOSCOPE EQUIPPED WITH SAME
Document Type and Number:
WIPO Patent Application WO/2019/198348
Kind Code:
A1
Abstract:
The present invention provides a compact stereoscopic objective optical system for an endoscope that has a wide angle of view and provides a suitable stereoscopic effect, and an endoscope equipped with the same. The stereoscopic objective optical system for an endoscope includes, in order from the object side, a first lens group G1 having a negative refractive power, a second lens group G2 having a positive refractive power, and a rear lens group GR having a positive refractive power. The rear lens group GR has a first rear group GR1 and a second rear group GR2. The first lens group G1 and the second lens group G2 are arranged so that the optical axes coincide with each other. The optical axes of the first lens group G1, the first rear group GR1, and the second rear group GR2 are located on the same plane. The optical axis of the first lens group G1 is located between the optical axis of the first rear group GR1 and the optical axis of the second rear group GR2. Each of the first rear group GR1 and the second rear group GR2 is made up of a first subgroup, an aperture stop, and a second subgroup, and the first subgroup has a negative lens. The stereoscopic objective optical system satisfies the following conditional expression (1). 0 < -f21n / fSUB ≤ 3 (1)

Inventors:
HANZAWA Toyoharu (2951 Ishikawa-machi, Hachioji-sh, Tokyo 07, 〒1928507, JP)
SUGA Takeshi (2951 Ishikawa-machi, Hachioji-sh, Tokyo 07, 〒1928507, JP)
Application Number:
JP2019/006445
Publication Date:
October 17, 2019
Filing Date:
February 21, 2019
Export Citation:
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Assignee:
OLYMPUS CORPORATION (2951, Ishikawa-machi Hachioji-sh, Tokyo 07, 〒1928507, JP)
International Classes:
G02B13/04; A61B1/00; G02B13/18; G02B23/26
Domestic Patent References:
WO2016006505A12016-01-14
WO2017017854A12017-02-02
Foreign References:
JP2016527566A2016-09-08
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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