Glass substrate and method for manufacturing the same, cover glass and method for manufacturing the same, personal digital assistant, and display device

Patent metadata

Field	Value
Publication number	US-2016357294-A1
Application number	US-201615172490-A
Country	US
Kind code	A1
Filing date	Jun 3, 2016
Priority date	Jun 5, 2015
Publication date	Dec 8, 2016
Grant date	—

Abstract

In a glass substrate for extracting therefrom a plurality of cover glasses to protect a protection object, plural concave portions are provided in a front surface or back surface of the glass substrate. The glass substrate includes plural thin portions formed by providing the plural concave portions and a thick portion connecting to the thin portion, and a haze value of the thin portion is 8% or less.

First claim

What is claimed is:

1 . A glass substrate for extracting therefrom a plurality of cover glasses to protect a protection object, wherein:
plural concave portions are provided in a front surface of the glass substrate or a back surface of the glass substrate, the glass substrate includes plural thin portions formed by providing the plural concave portions and a thick portion connecting to the thin portion, and a haze value of the thin portion is 8% or less.

2 . The glass substrate according to claim 1 , wherein an arithmetic mean roughness of a front surface of the thin portion is 50 nm or less.

3 . The glass substrate according to claim 1 , wherein the plural concave portions are provided by etching.

4 . The glass substrate according to claim 1 , wherein a layer containing fluorine or chlorine is included in the outermost surface of the plural concave portions.

5 . The glass substrate according to claim 1 , wherein the plural concave portions are provided at predetermined intervals.

6 . The glass substrate according to claim 1 , wherein the plural concave portions are provided on only either one of the front surface of the glass substrate or the back surface of the glass substrate.

7 . The glass substrate according to claim 1 , wherein a bottom of the concave portion is in a shape protruding toward a central part thereof.

8 . The glass substrate according to claim 1 , wherein a side surface of the concave portion is in a curved shape smoothly connecting to a bottom of the concave portion.

9 . The glass substrate according to claim 8 , wherein a radius of curvature of the side surface is not less than a depth of the bottom.

10 . The glass substrate according to claim 8 , wherein a radius of curvature of the side surface is less than a depth of the bottom.

11 . The glass substrate according to claim 8 , wherein a radius of curvature of the side surface increases from a center part of the concave portion toward a peripheral part of the concave portion.

12 . The glass substrate according to claim 8 , wherein a radius of curvature of the side surface decreases from a center part of the concave portion toward a peripheral part of the concave portion.

13 . The glass substrate according to claim 8 , wherein a radius of curvature of the side surface is 0.1 mm or more and 2 mm or less.

14 . The glass substrate according to claim 1 , wherein a connecting part between a side surface of the concave portion and the front surface of the glass substrate or the back surface of the glass substrate is in a smoothly continuing curved shape.

15 . The glass substrate according to claim 1 , wherein a mark for positioning in extracting the plural cover glasses exists in a peripheral part of the front surface or back surface of the glass substrate.

16 . The glass substrate according to claim 1 , wherein plural marks for positioning in extracting the plural cover glasses exist in a peripheral part of the front surface or back surface of the glass substrate.

17 . The glass substrate according to claim 1 , wherein the front surface or back surface of the glass substrate has a concentration of a potassium ion higher than that in a center part of the thick portion in a thickness direction in a section view thereof.

18 . The glass substrate according to claim 1 , wherein a depth of a compressive stress layer in the concave portion is higher than a depth of a compressive stress layer in the thick portion.

19 . The glass substrate according to claim 1 , wherein a depth of a compressive stress layer in the thick portion is higher than a depth of a compressive stress layer in the concave portion.

20 . The glass substrate according to claim 1 , wherein at least one of an anti-glare treated layer, an anti-reflection layer, an anti-fingerprint layer and an anti-fogging layer is contained on the thick portion of the front surface or back surface of the glass substrate.

21 . The glass substrate according to claim 20 , wherein the anti-glare treated layer is included in at least a part of a position that faces the concave portion.

22 . The glass substrate according to claim 20 , wherein the anti-glare treated layer is included in at least a part of a peripheral part of a position that faces the concave portion.

23 . The glass substrate according to claim 20 , wherein a layer containing fluorine or chlorine is included in the outermost surface of the anti-glare treated layer.

24 . The glass substrate according to claim 20 , wherein the anti-glare treated layer has a composition different from that in a center part of the thick portion in a thickness direction of the glass substrate in a section view thereof.

25 . A cover glass to protect a protection object, wherein:
at least one concave portion is provided in a front surface or back surface of the cover glass, the cover glass includes a thin portion formed by providing the concave portion and a thick portion connecting to the thin portion, and a haze value of the thin portion is 8% or less.

26 . The cover glass according to claim 25 , wherein an arithmetic mean roughness of a front surface of the thin portion is 50 nm or less.

27 . The cover glass according to claim 25 , wherein the concave portion is provided by etching.

28 . The cover glass according to claim 25 , wherein a layer containing fluorine or chlorine is included in the outermost surface of the concave portion.

29 . The cover glass according to claim 25 , wherein a bottom of the concave portion is in a shape protruding outside the concave portion toward a central part thereof.

30 . The cover glass according to claim 25 , wherein the outermost surface of the front surface or back surface has a concentration of a potassium ion higher than that in a center part of the thick portion in a thickness direction in a section view thereof.

31 . The cover glass according to claim 25 , wherein the front surface or back surface is a polished surface.

32 . The cover glass according to claim 31 , wherein the polished surface is formed in a chemically strengthened layer.

33 . The cover glass according to claim 25 , wherein a depth of a compressive stress layer in the concave portion is higher than a depth of a compressive stress layer in the thick portion

34 . The cover glass according to claim 25 , wherein a depth of a compressive stress layer in the thick portion is higher than a depth of a compressive stress layer in the concave portion.

35 . The cover glass according to claim 25 , wherein an anti-glare treated layer is included in at least a part of a surface of the cover glass.

36 . The cover glass according to claim 35 , wherein the anti-glare treated layer is included in at least a part of a position that faces the concave portion.

37 . The cover glass according to claim 35 , wherein the anti-glare treated layer is included in at least a part of a peripheral part of a position that faces the concave portion.

38 . The cover glass according to claim 35 , wherein a layer containing fluorine or chlorine is included in the outermost surface of the anti-glare treated layer.

39 . The cover glass according to

Assignees

• Asahi Glass Co Ltd

Inventors

• Ozeki Masao
• Tada Masahiko
• Sano Makoto
• Taito Osami

Classifications

• G06F3/0433

  in which the acoustic waves are either generated by a movable member and propagated within a surface layer or propagated within a surface layer and captured by a movable member · CPC title

• C03C3/078

  containing an oxide of a divalent metal, e.g. an oxide of zinc · CPC title

• H04M2250/12

  including a sensor for measuring a physical value, e.g. temperature or motion · CPC title

• C03C15/00

  Surface treatment of glass, not in the form of fibres or filaments, by etching (etching or surface-brightening compositions, in general C09K13/00) · CPC title

• C03C3/076

  with 40% to 90% silica, by weight {(C03C3/045 takes precedence)} · CPC title