Title:
VARIABLE POWER OPTICAL SYSTEM FOR ENDOSCOPE, AND ENDOSCOPE
Document Type and Number:
WIPO Patent Application WO/2017/043351
Kind Code:
A1
Abstract:
This variable power optical system for an endoscope is configured to satisfy prescribed conditions. The variable power optical system for an endoscope comprises: a first lens group with a positive power, having at least a negative lens with a concave surface facing an image, a positive lens with a convex surface facing the image, and a cemented lens where a negative lens and a positive lens are cemented; a second lens group with a negative power, having at least a cemented lens where a negative lens and a positive lens are cemented; and a third lens group with a positive power, having at least a positive lens and a cemented lens where a negative lens and a positive lens are cemented.
Inventors:
NASU SACHIKO (JP)
Application Number:
PCT/JP2016/075157
Publication Date:
March 16, 2017
Filing Date:
August 29, 2016
Export Citation:
Assignee:
HOYA CORP (JP)
International Classes:
G02B15/15; A61B1/00; G02B23/26
Domestic Patent References:
| WO2014045800A1 | 2014-03-27 |
Foreign References:
| JP2012032576A | 2012-02-16 | |||
| JPH09152551A | 1997-06-10 | |||
| JP2010032680A | 2010-02-12 |
Attorney, Agent or Firm:
MATSUOKA, Shuhei et al. (JP)
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