Patent ID: 9709790
Date: 2017-07-18
CPC Classifications: G02B

Claim:
1. An immersion microscope objective comprising, in order from an object side: a first lens group; a second lens group; and a third lens group; wherein the first lens group has a positive refractive power and includes a first cemented lens disposed nearest to the object side in the first lens group, the second lens group includes a second cemented lens, the third lens group includes a lens component that has a positive refractive power and changes a divergent light beam incident from the second lens group to a convergent light beam, one or more lens components that change the convergent light beam to a divergent light beam, and a lens component that has a positive refractive power and changes the divergent light beam to a parallel light beam and emits the parallel light beam, and the following conditional expressions (1) is satisfied: where d f denotes a focal length of the immersion microscope objective, NA each of the lens components of the third lens group is a single lens or a cemented lens.