Pennie & Edmonds LLP
Objective lens system
 This invention relates to a microscope objective lens system a part of which is immersed in a liquid to observe a sample present in the liquid. Particularly, this invention provides an apochromat-grade microscope objective lens system which can be machined cheaply and easily by the conventional technology, which is well corrected for chromatic aberration, and which is excellent in flatness of the image plane. This objective lens system has a plane-parallel plate on the most sample side, is constructed without using an embedded lens as used in the conventional objectives, and can take a variety of lens layouts. 
Nikon Corporation
G G
G02B G02B
inventional inventional
Hiroshi Yutaka Itoe
Yamada Suenaga Ito