US 12,443,040 B2
Louver, head mounted display, and optical apparatus
Hideo Genda, Tokyo (JP); and Ryoshu Iura, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jul. 11, 2022, as Appl. No. 17/861,330.
Claims priority of application No. 2021-118034 (JP), filed on Jul. 16, 2021; application No. 2022-045093 (JP), filed on Mar. 22, 2022; and application No. 2022-097691 (JP), filed on Jun. 17, 2022.
Prior Publication US 2023/0031619 A1, Feb. 2, 2023
Int. Cl. G02B 17/00 (2006.01); G02B 5/00 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/005 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A louver comprising:
a light blocking portion including a first surface and a second surface; and
a base portion made of a transparent material,
wherein the light blocking portion is formed in the base portion, being made of a light blocking material,
wherein the second surface is a surface that is in contact with the transparent material and that is located on an outer-edge side of the base portion,
wherein the first surface is a surface that is in contact with the transparent material and that is opposite to the second surface,
wherein a surface roughness of the first surface is larger than a surface roughness of the second surface, and
wherein a surface roughness Ra of the first surface is equal to or larger than 20 nm and is equal to or smaller than 2000 nm.