Title:
OBJECTIVE LENS, OPTICAL SYSTEM, AND MICROSCOPE
Document Type and Number:
WIPO Patent Application WO/2019/225063
Kind Code:
A1
Abstract:
A microscope objective lens (OL) comprises a first lens group (G1) having a positive refractive power and a second lens group (G2) having a negative refractive power. The first lens group (G1) has a diffractive optical element (DOE). The second lens group (G2) includes a first cemented lens (CL21) made by bonding a positive lens (L21) and a negative lens (L22) with the concave surface facing the image side and a second cemented lens (CL22) made by bonding a negative lens (L23) with the concave surface facing the object side and a positive lens (L24). The microscope objective lens satisfies the following conditional expression:
65.0 <νd1
0.0045 <θgd1 + (0.002076 ×νd1) - 1.36467
where νd1 represents the Abbe's number with respect to the d-line of the negative lens (L23), and θgd1 represents the partial dispersion ratio of the negative lens (L23).
Inventors:
MATSUMOTO MIHO (JP)
Application Number:
PCT/JP2019/003605
Publication Date:
November 28, 2019
Filing Date:
February 01, 2019
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B21/02; G02B13/18; G02B21/36
Foreign References:
JP2015135440A | 2015-07-27 | |||
JPH06331898A | 1994-12-02 | |||
JP2010186162A | 2010-08-26 |
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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