公开(公告)号：US20180113293A1

公开(公告)日：2018-04-26

申请号：US15784725

申请日：2017-10-16

Applicant: OLYMPUS CORPORATION

Inventor： Kenichiro ABE ,  Hirokazu KONISHI ,  Masahiro SAKAKURA ,  Takashi KASAHARA ,  Yuso FUJITA

IPC: G02B21/02 ,  G02B9/18

CPC classification number: G02B21/025 ,  G02B9/18 ,  G02B21/02

Abstract: An objective includes a first lens group that has a positive refractive power and a second lens group that has a negative refractive power. The objective includes a first negative lens and satisfies 0.005≤dol/hol≤0.1   (1) 0.005≤hmin/hl≤0.72   (2) 10 mm≤L≤100 mm   (3) 0.1≤L/f≤31   (4) when do1is a thickness of the first negative lens, ho1 is an axial marginal ray height on a lens surface on the object side of the first negative lens, hmin is a minimum value of an axial marginal ray height in the second lens group, hl is a height of an axial marginal ray on a lens surface of the objective that is situated closest to the image side, L is a length of the objective, and f is a focal length of the objective.

公开(公告)号：US20170322404A1

公开(公告)日：2017-11-09

申请号：US15658981

申请日：2017-07-25

Applicant: OLYMPUS CORPORATION

Inventor： Kenichiro ABE

IPC: G02B21/02 ,  G02B21/33 ,  G02B13/24

CPC classification number: G02B21/02 ,  G02B13/24 ,  G02B21/33

Abstract: An objective includes, in order from an object side, first, second, and third lens groups. The first lens group includes, in order from the object side, a first lens, a second lens, and a third lens component. When NA represents an objective numerical aperture, f represents an objective focal length, fG1 represents a first lens group focal length, r11 represents a radius of curvature of a lens surface on the object side of the first lens, r12 represents a radius of curvature of a lens surface on an image side of the first lens, and d012 represents a distance on an optical axis from a front-side focal plane of the objective to a lens surface on the image side of the first lens, the objective satisfies: 0.8≦NA

公开(公告)号：US20170010454A1

公开(公告)日：2017-01-12

申请号：US15197211

申请日：2016-06-29

Applicant: OLYMPUS CORPORATION

Inventor： Kenichiro ABE

IPC: G02B21/02 ,  G02B27/00 ,  G02B9/64

CPC classification number: G02B21/02 ,  G02B9/64

Abstract: 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