公开(公告)号：US20230012479A1

公开(公告)日：2023-01-19

申请号：US17783252

申请日：2020-12-02

Applicant: Nikon Corporation

Inventor： Fumiaki OHTAKE ,  Azuna NONAKA ,  Yoshiharu YUASA ,  Takeshi UMEDA

IPC: G02B15/14 ,  G02B15/15 ,  G02B15/22

Abstract: A variable magnification optical system (ZL) comprises a preceding lens group (GA) having negative refractive power and a succeeding lens group (GB) having positive refractive power, which are arranged in order from the object side along an optical axis. The succeeding lens group (GB) has a focusing group (GF) and an image-side group (GC) disposed closer to the image side than the focusing group (GF), the focusing group (GF) moves to the image side along the optical axis from focusing on an object at infinity to focusing on a close-distance object, and the following conditional expression is satisfied. 1.80