公开(公告)号：US20230367186A1

公开(公告)日：2023-11-16

申请号：US18142264

申请日：2023-05-02

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Yuka IKEGAMI ,  Takahiro KITADA ,  Kunio DOHNO

IPC: G03B17/14 ,  G02B9/16 ,  G02B7/02 ,  H04N23/12 ,  H04N23/60

CPC classification number: G03B17/14 ,  G02B9/16 ,  G02B7/021 ,  H04N23/12 ,  H04N23/64

Abstract: An imaging optical system consists of: a first lens group having positive power; a second lens group having negative power; and a third lens group having positive power. The first lens group and the third lens group are fixed with respect to an image plane, with the second lens group moving along an optical axis, while the imaging optical system is focusing to make a transition from an infinity in-focus state toward a close-object in-focus state. The first lens group consists of: a sub-lens group G1A; an aperture stop; and a sub-lens group G1B. The sub-lens group G1A includes: a lens L1A1 having negative power; a lens L1A2 having negative power; and a lens L1A3 having negative power.