Title:
RELAY OPTICAL SYSTEM, RIGID SCOPE OPTICAL SYSTEM USING SAME, AND RIGID SCOPE
Document Type and Number:
WIPO Patent Application WO/2017/217291
Kind Code:
A1
Abstract:
Provided are: a relay optical system that excellently corrects chromatic aberration; a rigid scope optical system using the same; and a rigid scope. The relay optical system has cemented lenses, each having joined therein a first lens having positive refractive power, a second lens having positive refractive power, and a third lens having negative refractive power. Each cemented lens is arranged upon an optical path of the relay optical system formed by an object-side optical path and an image-side optical path. The first lens is a meniscus lens adjacent to the third lens. The dispersion and partial dispersion ratios are different for the first lens and the third lens, and when, in a Cartesian coordinate system having a horizontal axis νdLA and a vertical axis θgFLA, a straight line indicated by θgFLA = α ×νdLA + βLA (where α = -0.00163) is set, a first lens medium θgFLA and νdLA are included in an area defined by conditional formula (1) and conditional formula (2), and conditional formula (3) is fulfilled. 0.67 ≤ βLA (1); νdLA < 50 (2); -1.4 < mg < -0.6 (3)
Inventors:
AMANAI TAKAHIRO (JP)
Application Number:
PCT/JP2017/021080
Publication Date:
December 21, 2017
Filing Date:
June 07, 2017
Export Citation:
Assignee:
OLYMPUS CORP (JP)
International Classes:
G02B13/00; A61B1/00; A61B1/055; G02B13/18; G02B23/26
Domestic Patent References:
| WO1989011112A1 | 1989-11-16 | |||
| WO2013021704A1 | 2013-02-14 | |||
| WO2014199236A2 | 2014-12-18 |
Foreign References:
| JP2015118136A | 2015-06-25 | |||
| US5684629A | 1997-11-04 | |||
| JP2003524204A | 2003-08-12 | |||
| JP2015508511A | 2015-03-19 | |||
| US5568312A | 1996-10-22 |
Attorney, Agent or Firm:
SAITO Keisuke et al. (JP)
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