US 12,001,037 B2
Light control filter
Shinji Hotta, Saitama (JP)
Assigned to SHIN-ETSU POLYMER CO., LTD., Tokyo (JP)
Appl. No. 17/053,355
Filed by Shin-Etsu Polymer Co., Ltd., Tokyo (JP)
PCT Filed May 8, 2019, PCT No. PCT/JP2019/018402
§ 371(c)(1), (2) Date Jan. 7, 2021,
PCT Pub. No. WO2019/216342, PCT Pub. Date Nov. 14, 2019.
Claims priority of application No. 2018-091448 (JP), filed on May 10, 2018.
Prior Publication US 2021/0231848 A1, Jul. 29, 2021
Int. Cl. G02B 5/22 (2006.01)
CPC G02B 5/22 (2013.01) 2 Claims
OG exemplary drawing
 
1. A light control filter, comprising a sheet having a sea-island structure including a light-transmitting portion and a light-shielding portion,
wherein the light-transmitting portion and the light-shielding portion each extend from a first principal surface to a second principal surface,
wherein the light-transmitting portion forms a plurality of island portions configured to penetrate completely through the sheet from the first principal surface to the second principal surface, and the light-shielding portion forms a sea portion configured to separate the plurality of island portions from one another,
wherein the sea portion has an MD-1 rubber hardness of 25 or more and 80 or less,
wherein the sea portion includes 50 mass % or more of a silicone rubber with respect to a total mass of the sea portion,
wherein an aspect ratio between a size of each of the plurality of island portions in plan view of the sheet and a height of each of the plurality of island portions in a thickness direction of the sheet is from 1:8.5 to 1:25.5,
wherein a size of each of the plurality of island portions in plan view of the sheet is 5 μm or more and 50 μm or less,
wherein a three-dimensional shape of each of the plurality of island portions in the sheet is a columnar shape,
wherein the plurality of island portions are arranged in a two-dimensional array in plan view of the sheet, and
wherein the light control filter can be handled in a form of a single layer as a single light control filter, and a support layer configured to maintain the mechanical strength of the light control filter is not required.