公开(公告)号：US20180045921A1

公开(公告)日：2018-02-15

申请号：US15796778

申请日：2017-10-28

Applicant: Nikon Corporation

Inventor： Masato KUMAZAWA ,  Katsuya WATANABE ,  Miwako YOSHIDA ,  Junya HAGIWARA ,  Takashi KUSAKA ,  Atsushi SEKINE

IPC: G02B13/00 ,  G02B9/60

CPC classification number: G02B13/0045 ,  G02B7/021 ,  G02B9/60 ,  H04N5/2254

Abstract: An imaging lens (PL) has an image surface (I) curved to have a concave surface facing an object and consists of, in order from the object along an optical axis (Ax): a front group (Ga) including four lenses (L1 to L4); and a back group (Gb) including a single lens (L5). The following conditional expression is satisfied. 0.25