公开(公告)号：US20230400609A1

公开(公告)日：2023-12-14

申请号：US18326552

申请日：2023-09-01

Applicant: KEIWA Inc.

Inventor： Masayuki SUKIGARA ,  Akira FURUTA ,  Motohiko OKABE

IPC: G02B5/02 ,  G02F1/1335

CPC classification number: G02B5/0231 ,  G02B5/0278 ,  G02F1/133607

Abstract: A light diffusion sheet 43 includes, at least in its first surface 43a, a plurality of recesses 22 formed in a substantially inverted polygon pyramid or in a substantially inverted truncated polygon pyramid. The ridge 23 parting the plurality of recesses 22 has a recessed shape between the intersections 23a, with respect to a straight line connecting the intersections 23a of the ridge 23. Where P is the arrangement pitch of the plurality of recesses 22 and Wr is the dimension occupied by a curved portion at the top portion of the ridge 23 in the arrangement direction of the plurality of recesses 22, a ratio Wr/P is 0.3 or less. The maximum height difference d between the ridge 23 and the straight line connecting the intersections 23a of the ridge 23 is 1 μm or more and 10 μm or less.

公开(公告)号：US20200342200A1

公开(公告)日：2020-10-29

申请号：US16857071

申请日：2020-04-23

Applicant: KEIWA Inc.

Inventor： Akira FURUTA ,  Koji TERAMOTO

IPC: G06K9/00 ,  H01L27/32 ,  H01L51/52

Abstract: A protective film covers the surface of a cover member in an OLED display with a fingerprint recognition system. The protective film includes a base layer with an in-plane retardation value of 25 nm or less. A hard coat layer may be formed on a surface of the base layer. The surface is a surface farther from the cover member.

公开(公告)号：US20170182753A1

公开(公告)日：2017-06-29

申请号：US15316035

申请日：2015-06-04

Applicant: KEIWA INC.

Inventor： Hironori NAKASHIMA ,  Akira FURUTA

IPC: B32B27/32 ,  G02F1/1335 ,  B32B7/12 ,  B32B3/30 ,  B32B27/06

CPC classification number: B32B27/325 ,  B32B1/00 ,  B32B3/30 ,  B32B7/06 ,  B32B7/12 ,  B32B17/00 ,  B32B27/00 ,  B32B27/06 ,  B32B27/08 ,  B32B27/18 ,  B32B27/22 ,  B32B27/24 ,  B32B27/285 ,  B32B27/308 ,  B32B27/40 ,  B32B2255/10 ,  B32B2255/20 ,  B32B2255/26 ,  B32B2264/0207 ,  B32B2270/00 ,  B32B2307/408 ,  B32B2307/412 ,  B32B2307/418 ,  B32B2307/54 ,  B32B2307/546 ,  B32B2307/558 ,  B32B2307/7145 ,  B32B2307/7246 ,  B32B2307/732 ,  B32B2457/202 ,  B32B2457/204 ,  B32B2457/206 ,  C09J7/241 ,  C09J2201/606 ,  C09J2201/622 ,  C09J2203/318 ,  C09J2421/00 ,  C09J2423/00 ,  G02F1/133308 ,  G02F1/133502 ,  G02F2001/133331 ,  G02F2201/501 ,  G02F2202/022 ,  G02F2202/28

Abstract: A sheet for an image display unit to be provided on the front face side of an image display unit includes a substrate layer containing a cycloolefin copolymer as a principal component and an elastomer having a refractive index substantially equal to the refractive index of the cycloolefin copolymer, in an amount of no less than 2 parts by mass and no greater than 7 parts by mass with respect to 100 parts by mass of the cycloolefin copolymer. The substrate layer preferably has an average thickness of no less than 100 μm and no greater than 500 μm, a water absorbing rate preferably no greater than 0.5%, a tensile strength of preferably no less than 40 MPa and no greater than 70 MPa, and a tensile elongation in a longitudinal direction at 25° C. is preferably no less than 4% and no greater than 15%.

公开(公告)号：US20170176663A1

公开(公告)日：2017-06-22

申请号：US15316065

申请日：2015-06-08

Applicant: KEIWA INC.

Inventor： Akira FURUTA ,  Hironori NAKASHIMA

IPC: F21V8/00

CPC classification number: G02B6/0031 ,  G02B6/002 ,  G02B6/0051 ,  G02B6/0055

Abstract: The edge-lit backlight unit according to the present invention includes a light guide film having an average thickness of no less than 100 μm and no greater than 600 μm; at least one thin light source disposed so as to face at least one end face of the light guide film, in which rays of light emitted from the thin light source exit from a front face of the light guide film; and a first reflection tape disposed so as to cover a front face side of an end edge on a side of the at least one thin light source of the light guide film. The first reflection tape may be disposed so as to cover a front face side of a gap between the at least one thin light source and the light guide film.

公开(公告)号：US20140092627A1

公开(公告)日：2014-04-03

申请号：US14039458

申请日：2013-09-27

Applicant: KEIWA INC.

Inventor： Hironori NAKASHIMA ,  Akira FURUTA

IPC: F21V8/00

CPC classification number: G02B6/0055 ,  G02B6/0043 ,  G02B6/0065

Abstract: The optical waveguide sheet of the present invention is for use in an edge-lit backlight unit of a liquid crystal display unit of laptop computers having a housing thickness of no greater than 21 mm, and includes: an optical waveguide layer containing a polycarbonate-based resin as a principal component; and a hard coat layer laminated on the back face side of the optical waveguide layer, an average thickness of the optical waveguide sheet being no greater than 600 μm. An average thickness of the hard coat layer is preferably from 2 μm to 20 μm. The optical waveguide sheet preferably further includes a lower refractive index layer that is laminated on the back face of the optical waveguide layer and has a refractive index lower than that of the optical waveguide layer, and the hard coat layer is preferably laminated on the back face of the lower refractive index layer.

Abstract translation: 本发明的光波导片用于具有不大于21mm的壳体厚度的膝上型计算机的液晶显示单元的边缘照明背光单元，并且包括：包含聚碳酸酯基的光波导层 树脂为主要成分; 以及层叠在光波导层的背面侧的硬涂层，光波导片的平均厚度不大于600μm。 硬涂层的平均厚度优选为2μm〜20μm。 光波导片优选还包括层叠在光波导层的背面上的折射率低于光波导层的折射率的低折射率层，并且硬涂层优选层叠在背面上 的低折射率层。

公开(公告)号：US20240295678A9

公开(公告)日：2024-09-05

申请号：US18326552

申请日：2023-05-31

Applicant: KEIWA Inc.

Inventor： Masayuki SUKIGARA ,  Akira FURUTA ,  Motohiko OKABE

IPC: G02B5/02 ,  G02F1/1335

CPC classification number: G02B5/0231 ,  G02B5/0278 ,  G02F1/133607

Abstract: A light diffusion sheet 43 includes, at least in its first surface 43a, a plurality of recesses 22 formed in a substantially inverted polygon pyramid or in a substantially inverted truncated polygon pyramid. The ridge 23 parting the plurality of recesses 22 has a recessed shape between the intersections 23a, with respect to a straight line connecting the intersections 23a of the ridge 23. Where P is the arrangement pitch of the plurality of recesses 22 and Wr is the dimension occupied by a curved portion at the top portion of the ridge 23 in the arrangement direction of the plurality of recesses 22, a ratio Wr/P is 0.3 or less. The maximum height difference d between the ridge 23 and the straight line connecting the intersections 23a of the ridge 23 is 1 μm or more and 10 μm or less.

公开(公告)号：US20140092626A1

公开(公告)日：2014-04-03

申请号：US14039375

申请日：2013-09-27

Applicant: KEIWA INC.

Inventor： Hironori NAKASHIMA ,  Akira FURUTA

IPC: F21V8/00

CPC classification number: G02B6/0055 ,  G02B6/0093

Abstract: The optical waveguide sheet of the present invention is an optical waveguide sheet for use in an edge-lit backlight unit of a liquid crystal display unit of laptop computers having a housing thickness of no greater than 21 mm, and includes an optical waveguide layer containing a polycarbonate-based resin as a principal component; and a protective layer laminated on the back face of the optical waveguide layer, the protective layer containing an acrylic resin as a principal component, wherein an average thickness of the optical waveguide sheet is no lower than 250 μm and no greater than 600 μm. An average thickness of the protective layer is preferably no less than 10 μm and no greater than 100 μm, and a relative refractive index of the protective layer with respect to the optical waveguide layer is preferably no greater than 0.95.

Abstract translation: 本发明的光波导片是用于具有不大于21mm的壳体厚度的膝上型计算机的液晶显示单元的边缘照明背光单元中的光波导片，并且包括含有 聚碳酸酯类树脂为主要成分; 以及层叠在光波导层的背面上的保护层，保护层含有丙烯酸树脂作为主要成分，其中光波导片的平均厚度不低于250μm且不大于600μm。 保护层的平均厚度优选为10μm以上且100μm以下，保护层相对于光波导层的相对折射率优选为0.95以下。