MICROSCOPE OBJECTIVE LENS, MICROSCOPE OPTICAL SYSTEM, AND MICROSCOPE DEVICE

WIPO Patent Application WO/2022/138365

A1

This microscope objective lens (OL) is constituted by a first lens group (G1), a second lens group (G2) having a positive refractive power, a third lens group (G3) having a concave surface facing the image side, and a fourth lens group (G4) having a concave surface facing the object side. The first lens group (G1) is consituted by a plano-convex positive lens (L101) having a flat surface facing the object side, and a negative lens (L102). The first lens group satisfies the following conditional expressions.　Conditional expressions 1.8