Objective lens system for microscope

Abstract

An microscope objective lens system comprises a first lens unit including a plurality of cemented lens components and converging light coming from an object, a second lens unit including a negative lens component having a strong concave surface on the image side, and a third lens unit including a cemented doublet composed of a negative lens element having a concave surface on the object side and a positive lens element, wherein the objective lens system satisfies the following conditions: 1.65≦nd≦1.8 25≦νd≦41 T360≧0.5 wherein nd and νd are refractive index at the Fraunhofer d-line and the Abbe's number of the positive lens element in the third lens unit, respectively, and T360 is an internal transmittance except for a reflection loss at 360 nm for 10 mm thickness of material forming the positive lens element in the third lens unit.

Dependencies are inferred from the claim text.