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1. (WO2011158778) MICROSCOPE OBJECTIVE LENS

Pub. No.:    WO/2011/158778    International Application No.:    PCT/JP2011/063477
Publication Date: Dec 22, 2011 International Filing Date: Jun 13, 2011
IPC: G02B 21/02
G02B 13/18
Applicants: NIKON CORPORATION
株式会社ニコン
Toshi Taeko
渡士 妙子
Takasago Kazuhiro
▲高▼砂 和浩
Inventors: Toshi Taeko
渡士 妙子
Takasago Kazuhiro
▲高▼砂 和浩
Title: MICROSCOPE OBJECTIVE LENS
Abstract:
Provided is a microscope objective lens that has a long working distance and sufficiently corrects both on-axis and off-axis chromatic aberration. A microscope objective lens (OL) has, in the following order from the object side, a first lens group (G1) that has positive refractive power, and a second lens group (G2) that has negative refractive power. Moreover, the first lens group (G1) of the microscope objective lens (OL) has a diffractive optical element (GD) having a diffractive optical surface (D), and the diffractive optical element (GD) is disposed in a position further towards the image side than the location where the diameter of the light flux that passes through the first lens group (G1) is greatest.