US 12,242,026 B2
Optical element and optical element production method
Jinichi Kasuya, Kokubunji (JP); and Kazunari Tada, Hachioji (JP)
Assigned to KONICA MINOLTA, INC., Tokyo (JP)
Appl. No. 17/251,503
Filed by Konica Minolta, Inc., Tokyo (JP)
PCT Filed Jun. 7, 2019, PCT No. PCT/JP2019/022739
§ 371(c)(1), (2) Date Dec. 11, 2020,
PCT Pub. No. WO2019/240039, PCT Pub. Date Dec. 19, 2019.
Claims priority of application No. 2018-114006 (JP), filed on Jun. 14, 2018.
Prior Publication US 2021/0124091 A1, Apr. 29, 2021
Int. Cl. G02B 1/115 (2015.01)
CPC G02B 1/115 (2013.01) 16 Claims
OG exemplary drawing
 
1. An optical element obtained by forming a multi-layer coating having two or more layers on a base plate that is optically transparent, wherein
the base plate is an imaging lens of a camera,
the multi-layer coating has at least one low-refractive-index layer and at least one high-refractive-index layer,
a topmost layer farthest from the base plate is the low-refractive-index layer,
the high-refractive-index layer adjacent to the topmost layer is a functional layer containing, as a main component, a metal oxide having a photocatalytic function, and
the topmost layer has a plurality of pores that partially expose a surface of the functional layer, and the plurality of pores is uniformly distributed in the topmost layer.