Patent ID: 6392814
Filing Date: 2002-05-21
Classification: G02B

Abstract:
A microscope objective lens comprising, in order from the object side, a first lens group, a second lens group and a third lens group;said first lens group comprising a meniscus lens with its concave surface facing the object side and a plurality of cemented lenses, and having a positive refractive power on the whole; said second lens group comprising a plurality of cemented lenses and having a positive refractive power on the whole; and said third lens group comprising a plurality of cemented lenses and having a negative refractive power on the whole; the lens fulfilling the following conditions (1) to (3): 2.51/f<5â€ƒâ€ƒ(1) 302/f<70â€ƒâ€ƒ(2) 153/f|<30â€ƒâ€ƒ(3) where;f1 is the focal length of the first lens group; f2 is the focal length of the second lens group; f3 is the focal length of the third lens group; and f is the focal length of the whole microscope objective lens system.