MICROSCOPE OPTICAL SYSTEM

摘要

A microscope optical system includes a first lens group having a positive power, a second lens group, and a third lens group including a positive lens. The first lens group includes: a first lens component arranged closest to an object, the first lens component including a first meniscus lens that has a meniscus shape with a concave surface facing the object side; a second lens component having a positive power that has a meniscus lens shape with the concave surface facing the object side; and a cemented lens including a positive lens and a negative lens that is made of a higher-dispersion material than a material of the positive lens. When NA, βG3, DG3i, DG23 represent a numerical aperture of the microscope optical system, a lateral magnification of the third lens group, a spacing between the third lens group and an image plane, a spacing between the second lens group and the third lens group, the microscope optical system satisfies the following conditional expressions:;0.25

主权项

1. A microscope optical system comprising in order from an object side:
a first lens group having a positive refractive power; a second lens group; and a third lens group including a positive lens, wherein the first lens group includes:
a first lens component that is arranged closest to an object, the first lens component including a first meniscus lens that has a meniscus shape with a concave surface facing the object side;a second lens component having a positive refractive power that has a meniscus lens shape with the concave surface facing the object side, the second lens component being arranged close to the first lens component on an image side of the first lens component; anda cemented lens including a positive lens and a negative lens that is made of a higher-dispersion material than a material of the positive lens, a height of an on-axis marginal ray becomes maximum in a lens component closest to an image in the first lens group, a spacing between the second lens group and the third lens group is a maximum lens spacing in an area on the object side of a positive lens arranged closest to the image from among the positive lens included in the third lens group, and when NA represents a numerical aperture of the microscope optical system, βG3 represents a lateral magnification of the third lens group, DG3i represents a spacing between the third lens group and an image plane, and DG23 represents a spacing between the second lens group and the third lens group, the microscope optical system satisfies the following conditional expressions:
0.25