Patent ID: 7199938

Claim:
An immersion objective lens system for microscope which consists, in order from the object side, of a first lens unit composed of a cemented lens component consisting of a plano-convex lens element having a planar surface on the object side and a meniscus lens element having a concave surface on the object side, a second lens unit composed of a lens component or two lens components, a third lens unit comprising at least two cemented lens components, a fourth lens unit comprising a meniscus lens component having a strongly concave surface on the image side, and a fifth lens unit comprising a meniscus lens component having a concave surface on the object side, and satisfies the following condition (1): 0.9 ≦|f 12/ f|≦ 1.3 (1) wherein a reference symbol f 12 represents a total focal length of the first lens unit and the second lens unit, and a reference symbol f designates a focal length of the objective lens system as a whole.