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1. (WO2018124248) ENDOSCOPE OBJECTIVE OPTICAL SYSTEM

Pub. No.:    WO/2018/124248    International Application No.:    PCT/JP2017/047131
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Thu Dec 28 00:59:59 CET 2017
IPC: G02B 13/04
Applicants: OLYMPUS CORPORATION
オリンパス株式会社
Inventors: KASAI Ken
河西研
Title: ENDOSCOPE OBJECTIVE OPTICAL SYSTEM
Abstract:
Provided is an endoscope objective optical system having a small diameter and good image formation capability, while being capable of magnifying observation and normal observation. The endoscope objective optical system comprises, in order from the object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, and a third lens group G3 having positive refractive power, such that the lens surface of the second lens group G2 positioned closest to the image has a concave surface facing toward the image, and the second lens group G2 moves along the light axis.