Title:
OBJECTIVE LENS, OPTICAL SYSTEM, AND MICROSCOPE
Document Type and Number:
WIPO Patent Application WO/2018/207833
Kind Code:
A1
Abstract:
Provided is an objective lens (OL) which has, in order from the object side, a positive lens (L11); a negative meniscus lens (L12) laminated onto the positive lens (L11) and having a concave surface facing the object side; and a positive meniscus lens (L13) having a concave surface facing the object side, and which satisfies the conditional expression, 2.03≤n1m≤2.30 20≤ν1m, where n1m is the refractive index of the negative meniscus lens (L12) with respect to the d-line, and ν1m is the Abbe number of the negative meniscus lens (L12).
Inventors:
WATANABE KATSUYA (JP)
NONAKA AZUNA (JP)
NONAKA AZUNA (JP)
Application Number:
PCT/JP2018/017969
Publication Date:
November 15, 2018
Filing Date:
May 09, 2018
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B21/02; G02B21/00; G02B21/36
Foreign References:
| JP2002341249A | 2002-11-27 | |||
| JP2003015046A | 2003-01-15 | |||
| JP2011075982A | 2011-04-14 | |||
| JP2010271693A | 2010-12-02 | |||
| JP2014196236A | 2014-10-16 |
Other References:
See also references of EP 3623859A4
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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