Title:
OBJECTIVE LENS UNIT FOR ENDOSCOPE AND ENDOSCOPE
Document Type and Number:
WIPO Patent Application WO/2019/054309
Kind Code:
A1
Abstract:
This objective lens unit is provided with, in order from the object side, a front lens group having negative refractive power, a stop, and a rear lens group having positive refractive power. The front lens group includes a negative lens having a concave surface facing the image surface side, and a positive lens having a convex surface facing the object side, and the rear lens group includes a positive lens having a convex surface facing the image surface side, and a cemented lens obtained by cementing a positive lens and a negative lens. The objective lens unit for an endoscope satisfies -1.6
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Inventors:
FUJII HIROAKI (JP)
NASU SACHIKO (JP)
NASU SACHIKO (JP)
Application Number:
PCT/JP2018/033292
Publication Date:
March 21, 2019
Filing Date:
September 07, 2018
Export Citation:
Assignee:
HOYA CORP (JP)
International Classes:
G02B13/04
Domestic Patent References:
| WO2012176667A1 | 2012-12-27 | |||
| WO2015064614A1 | 2015-05-07 |
Foreign References:
| JP2012168245A | 2012-09-06 | |||
| US20160238832A1 | 2016-08-18 | |||
| US20160154230A1 | 2016-06-02 |
Attorney, Agent or Firm:
GLOBAL IP TOKYO (JP)
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