Substrate with low-reflection property and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-2018136367-A1
Application number	US-201715800253-A
Country	US
Kind code	A1
Filing date	Nov 1, 2017
Priority date	Nov 11, 2016
Publication date	May 17, 2018
Grant date	—

Abstract

Provided is a substrate with low-reflection property having small changes in reflected light and color between a principal surface and a side surface when it is visually recognized, and including high displayability in a front substrate or the like which is disposed while exposing the side surface. A substrate 10 with low-reflection property includes: a transparent substrate 11 ; a first low-reflection film 12 provided on one principal surface of the transparent substrate 11 ; and a second low-reflection film 13 provided on a side surface of the transparent substrate 11 , wherein luminous reflectance Rtot of the first low-reflection film 12 provided on one principal surface is 1.5% or less, luminous reflectance Rs of the second low-reflection film 13 provided on the side surface is 2.5% or less, chromaticity a* is 0 to 4, and chromaticity b* is 3 to 9.

First claim

What is claimed is:

1 . A substrate with low-reflection property, comprising:
a transparent substrate; a first low-reflection film provided on one principal surface of the transparent substrate; and a second low-reflection film provided on a side surface of the transparent substrate, wherein luminous reflectance Rtot of the first low-reflection film provided on the one principal surface is 1.5% or less, luminous reflectance Rs of the second low-reflection film provided on the side surface is 2.5% or less, chromaticity a* of the second low-reflection film provided on the side surface is 0 to 4, and chromaticity b* of the second low-reflection film provided on the side surface is 3 to 9.

2 . The substrate with the low-reflection property according to claim 1 , further comprising:
a black printed shade on a part of the other principal surface of the transparent substrate.

3 . The substrate with the low-reflection property according to claim 2 ,
wherein the first low-reflection film provided on an opposite side of the transparent substrate from the black printed shade has the chromaticity a* of more than −6 and less than 6, and the chromaticity b* of more than −6 and less than 6.

4 . The substrate with the low-reflection property according to claim 1 ,
wherein the luminous reflectance Rtot of the first low-reflection film is 1.2% or less.

5 . The substrate with the low-reflection property according to claim 1 ,
wherein the luminous reflectance Rs of the second low-reflection film provided on the side surface is 2% or less.

6 . The substrate with the low-reflection property according to claim 1 ,
wherein a ratio of the luminous reflectance Rs to the luminous reflectance Rtot is 1 to 3.

7 . The substrate with the low-reflection property according to claim 1 ,
wherein the transparent substrate has an asperity shape due to an antiglare treatment on each of the one principal surface and the side surface.

8 . The substrate with the low-reflection property according to claim 1 ,
wherein the transparent substrate is a glass substrate.

9 . The substrate with the low-reflection property according to claim 8 ,
wherein the glass substrate is a chemically tempered glass.

10 . The substrate with the low-reflection property according to claim 9 ,
wherein a surface compressive stress of the chemically tempered glass is 400 MPa or more and 1200 MPa or less.

11 . The substrate with the low-reflection property according to claim 10 ,
wherein a depth of a surface compressive stress layer of the chemically tempered glass is 15 μm to 60 μm.

12 . A display device, comprising:
a display; and the substrate with the low-reflection property according to claim 1 provided on a front face of the display as a front substrate.

13 . A manufacturing method of a substrate with low-reflection property, comprising:
fixing a transparent substrate to a carrier substrate for fixing the transparent substrate with a spacer therebetween to have a predetermined interval; and simultaneously film-forming a first low-reflection film on one principal surface of the transparent substrate and a second low-reflection film on a side surface of the transparent substrate by a physical vapor deposition method, wherein luminous reflectance Rtot of the first low-reflection film provided on the one principal surface is 1.5% or less, luminous reflectance Rs of the second low-reflection film provided on the side surface is 2.5% or less, chromaticity a* of the second low-reflection film provided on the side surface is 0 to 4, and chromaticity b* of the second low-reflection film provided on the side surface is 3 to 9.

14 . The manufacturing method of the substrate with the low-reflection property according to claim 13 ,
wherein the physical vapor deposition method is sputtering.

Assignees

• Asahi Glass Co Ltd

Inventors

• Fujii Kensuke

Classifications

• G02B1/11 Primary

  Anti-reflection coatings · CPC title

• C23C14/34

  Sputtering · CPC title

• G02B5/003

  Light absorbing elements · CPC title

• G02B1/115

  Multilayers · CPC title