Patent ID: 9746658
Date: 2017-08-29
CPC Classifications: G02B

Claim:
1. An immersion type objective for a microscope, the immersion type objective comprising in order from an object side: a first lens group with positive refractive power; a second lens group with positive refractive power, the second lens group including a cemented lens that is configured of a lens with positive refractive power that is made of a low dispersion material and a lens with negative refractive power that is made of a high dispersion material; and a third lens group with negative refractive power, wherein: the first lens group includes in order from the object side: the third lens group includes a rear lens group with negative refractive power closest to an image side, the rear lens group includes: when NA represents a numerical aperture of the objective, f represents a focal length of the objective, f