MICROSCOPE OBJECTIVE OPTICAL SYSTEM HAVING WIDE SPECTRUM, LARGE NUMERICAL APERTURE, AND ULTRA-HIGH FLUX

摘要

A microscope objective optical system that has a wide spectrum, a large numerical aperture and ultra-high flux, successively comprising along the optical axis direction from an object plane to an image plane: a first lens group, a second lens group, a third lens group, and a fourth lens group, which are 20 lenses in total, wherein the first lens group is a catadioptric lens group, and light emitted from the object plane is imaged to a primary image plane (23) by means of folding a light path twice. The first lens group has positive focal power; the second lens group and the third lens group image the light that traverses the primary image plane (23) to a secondary image plane (24), and the second lens group and the third lens group both have positive focal power; and the fourth lens group images the light that traverses the secondary image plane (24) to the image plane. The present optical system has a small size while having a wide imaging spectrum and a large field angle.