公开(公告)号：US20240418975A1

公开(公告)日：2024-12-19

申请号：US18391570

申请日：2023-12-20

Applicant: Changzhou AAC Raytech Optronics Co., Ltd.

Inventor： Kaoru Yamazaki ,  Takashi Iwasaki

IPC: G02B21/02 ,  G02B9/64

Abstract: Disclosed is a microscope objective lens including from an emitting side to an objective side: the first lens to the twelfth lens. The focal length of the microscope objective lens is f, the numerical aperture is NA, and the working distance is WD. A focal length of a lens group consisting of the first lens to the fourth lens is f1-4, and a combined focal length between the seventh lens and the eighth lens is f78. The on-axis distances of the seventh and the eighth lens are d13 and d15, and an on-axis distance from the seventh lens to the eighth lens is d14. The central radiuses of curvature of the emitting surface and the objective surface of the eleventh lens are R21 and R22, respectively. The following relationship expressions are satisfied: 0.09≤f1−4/f≤0.15; −1.35≤f78/(d13+d14+d15)≤−0.95; −7.00≤R21/R22≤−2.00; 0.20≤NA*f/WD≤0.26. This microscope objective lens has excellent optical characteristics, and low aberration.