Glass plate and method for manufacturing the glass plate

Patent metadata

Field	Value
Publication number	US-9700985-B2
Application number	US-201414189117-A
Country	US
Kind code	B2
Filing date	Feb 25, 2014
Priority date	Aug 29, 2011
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

A glass plate includes two main flat surfaces, and a side surface adjacent to the two main flat surfaces. At least one edge part of the side surface includes a chamfered part in a thickness direction of the glass plate. The side surface includes a predetermined portion. In a case where the predetermined portion is etched with a depth of 10 μm, an etched surface of the predetermined portion includes no pit having a depth greater than or equal to 1 μm. The predetermined portion is a portion of the side surface in which a distance from one of the two main flat surfaces adjacent to the chamfered part in the thickness direction of the glass plate is less than or equal to ⅕ of the thickness of the glass plate.

First claim

What is claimed is:

1. A glass plate comprising:
two main flat surfaces;
a side surface adjacent to the two main flat surfaces, and
a chemically strengthened layer in at least one of the two main flat surfaces,
wherein at least one edge part of the side surface includes a chamfered part in a thickness direction of the glass plate,
wherein the side surface includes a predetermined portion,
wherein the glass plate has a property such that an etched surface of the predetermined portion includes no pit having a depth greater than or equal to 1 μm when the predetermined portion is etched with a depth of 10 μm and a depth of a pit in the etched surface of the predetermined portion is measured, the pit has no microscratch that is a source of breaking,
wherein the predetermined portion is a portion of the side surface in which a distance from one of the two main flat surfaces adjacent to the chamfered part in the thickness direction of the glass plate is less than or equal to ⅕ of the thickness of the glass plate, and
wherein a flexural strength of the glass plate is greater than or equal to 300 MPa.

2. The glass plate as claimed in claim 1 , wherein the side surface includes an area in which tensile stress caused by chemically strengthening remains.

3. The glass plate as claimed in claim 2 , wherein the predetermined portion of the side surface partly superposes the area in which tensile stress caused by chemically strengthening remains.

4. The glass plate of claim 1 , wherein the chamfered part is a flat surface and is diagonal with at least one main flat surface, or each edge part includes a chamfered part each of which is an outwardly curved surface and the chamfered parts are connected to each other omitting a flat part of the side surface.

5. The glass plate of claim 1 , wherein two edge parts of the side surface include a chamfered part in a thickness direction of the glass plate.

Assignees

• Asahi Glass Co Ltd

Inventors

• Kashima Izuru
• Kobayashi Yusuke

Classifications

• C03C19/00

  Surface treatment of glass, not in the form of fibres or filaments, by mechanical means (sand-blasting, grinding, or polishing glass B24) · CPC title

• C03C21/002

  to perform ion-exchange between alkali ions (C03C21/005 takes precedence) · CPC title

• G02F2001/133331

  Physics · mapped topic

• Y10T428/24488

  Differential nonuniformity at margin · CPC title

• G02F2001/133302

  Physics · mapped topic