公开(公告)号：US20190324248A1

公开(公告)日：2019-10-24

申请号：US16287754

申请日：2019-02-27

Applicant: OLYMPUS CORPORATION

Inventor： Kengo OSAWA

IPC: G02B21/02 ,  G02B13/00

Abstract: An objective includes the first and second groups. The first group includes the first cemented lens with a concave surface facing the object side, the first and second single lenses having positive power, and the second cemented lens with a concave surface facing an image side. The second group includes the third cemented lens with a concave surface facing the object side and a third single lens having positive power. Each of the cemented lenses combines one positive lens with one negative lens. The objective satisfies the following expressions. 0.31≤NA

公开(公告)号：US20190324251A1

公开(公告)日：2019-10-24

申请号：US16378996

申请日：2019-04-09

Applicant: OLYMPUS CORPORATION

Inventor： Yasuo YONEMARU ,  Kengo OSAWA

IPC: G02B21/02 ,  G02B9/06

Abstract: A dry microscope objective with a 20-fold magnification or lower that includes a first lens group having a positive refractive power and a second lens group having a positive refractive power, wherein the first and second lens groups have concave surfaces adjacent to each other and facing each other, and the microscope objective satisfies the following conditional expressions: 1.4≤(Wz(1)−Wz(0))/DOFd≤2.3  (1) 0≤WCRMS(Fiy)≤0.1λd (0≤Fiy≤0.7)  (2) where Wz indicates a function of a d-line optimization position that is an longitudinal position at which an RMS wavefront aberration in a d line at the object height ratio is minimized; DOFd indicates a depth of focus for the d line; WCRMS indicates a function of an RMS wavefront aberration in a C line that occurs at the d-line optimization position; Fiy indicates the object height ratio; and λd indicates the wavelength of the d line.