US 11,860,346 B2
Lens, zoom lens, and imaging lens
Kenji Ito, Saitama (JP); Toshio Sasaki, Saitama (JP); Masayasu Konishi, Saitama (JP); and Michio Cho, Saitama (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jun. 23, 2021, as Appl. No. 17/355,212.
Application 17/355,212 is a continuation of application No. 16/547,608, filed on Aug. 22, 2019, granted, now 11,079,576.
Application 16/547,608 is a continuation of application No. PCT/JP2018/005873, filed on Feb. 20, 2018.
Claims priority of application No. 2017-034074 (JP), filed on Feb. 24, 2017; and application No. 2018-009060 (JP), filed on Jan. 23, 2018.
Prior Publication US 2021/0325646 A1, Oct. 21, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 15/167 (2006.01); G02B 3/02 (2006.01); G02B 13/18 (2006.01); G02B 15/15 (2006.01); G02B 27/00 (2006.01)
CPC G02B 15/167 (2013.01) [G02B 3/02 (2013.01); G02B 13/18 (2013.01); G02B 15/15 (2013.01); G02B 27/0025 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A lens, comprising:
unevenness within an optical effective diameter of an optical surface,
wherein an arithmetic mean roughness within the optical effective diameter of the optical surface is 20 nm or more and 50 mn or less, and
an average value of widths of protrusion portions of the unevenness on an average line of a roughness curve of the optical surface is 1/200 or more and 1/50 or less of the optical effective diameter of the optical surface.