Patent ID: 8199408
Filing Date: 2012-06-12
Classification: G02B

Abstract:
1. An immersion microscope objective lens, comprising, in order from an object: a first lens group having positive refractive power, and including a first lens component in which a meniscus lens having a concave surface facing the object and a meniscus lens having a convex surface facing an image are cemented, a second lens component being a single lens having positive refractive power, and a third lens component in which a negative lens and a positive lens are cemented; a second lens group having positive refractive power, and including a lens component in which a negative lens and a positive lens are cemented; and a third lens group having negative refractive power, and the following conditional expressions being satisfied: where n11 denotes a refractive index at the d-line of the meniscus lens having a concave surface facing the object of the first lens component, n12 denotes a refractive index at the d-line of the meniscus lens having a convex surface facing the image of the first lens component, r1 denotes a radius of curvature of a lens surface contacting the immersion liquid of the meniscus lens having a concave surface facing the object of the first lens component, r2 denotes a radius of curvature of a cemented surface of the first lens component, F denotes a focal length of the entire lens system, and n3Gp denotes a refractive index at the d-line of the positive lens disposed closest to the image of the third lens group.