公开(公告)号：US20240361581A1

公开(公告)日：2024-10-31

申请号：US18641057

申请日：2024-04-19

Applicant: CANON KABUSHIKI KAISHA

Inventor： HIROSHI YAMAMOTO ,  KAZUHIKO KAJIYAMA ,  TOMOAKI KAWAKAMI ,  MASUO BAN

IPC: G02B13/18 ,  B60R1/12 ,  B60R1/26 ,  G02B1/115 ,  G02B9/64

CPC classification number: G02B13/18 ,  B60R1/26 ,  G02B1/115 ,  G02B9/64 ,  B60R1/12 ,  B60R2001/1253

Abstract: An optical system includes, in order from an object side to an image side, a front group, an aperture stop, and a rear group, wherein the front group includes a first lens, a second lens, and a third lens disposed in order from the object side to the image side, wherein an object side surface of the second lens is an aspheric surface having an inflection point in a cross section including an optical axis, wherein an image side surface of the second lens is a concave surface, wherein a first antireflection film is disposed on at least one of the image side surface of the second lens and an object side surface of the third lens, and wherein the predetermined inequality is satisfied.