Cover glass for mobile terminals, manufacturing method of the same and mobile terminal device

Patent metadata

Field	Value
Publication number	US-9249049-B2
Application number	US-201414223044-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	Dec 18, 2007
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

To provide cover glass for mobile terminals exhibiting high strength in a thin plate thickness state to enable reductions in thickness of apparatuses when inserted in the apparatuses, cover glass ( 1 ) for a mobile terminal of the invention is cover glass ( 1 ) that is obtained by forming a resist pattern on main surfaces of a plate-shaped glass substrate, then etching the glass substrate with an etchant using the resist pattern as a mask, and thereby cutting the glass substrate into a desired shape and that protects a display screen of the mobile terminal, where an edge face of the cover glass ( 1 ) is formed of a molten glass surface, and as surface roughness of the edge face, arithmetic mean roughness Ra is 10 nm or less.

First claim

The invention claimed is:

1. A method of manufacturing cover glass for a mobile terminal for protecting a display screen of the mobile terminal,
wherein resist patterns are formed on both main surfaces of a plate-shaped glass substrate, and then, using the resist patterns as a mask, the glass substrate is etched with an etchant of a mixed acid aqueous solution containing hydrofluoric acid and at least one kind of acid among sulfuric acid, nitric acid, hydrochloric acid, and hydrofluorosilicic acid, and is thereby cut into a desired shape including an outer circumferential shape of the cover glass.

2. The method of manufacturing cover glass for a mobile terminal according to claim 1 , wherein the plate-shaped glass substrate is formed by a down-draw method.

3. The method of manufacturing cover glass for a mobile terminal according to claim 1 , wherein an edge face of the cover glass has a protruding center portion and inclined surfaces that are declined respectively toward both main surface sides from the center portion, and boundary portions between the inclined surfaces and the main surfaces, respectively, are in a rounder shape.

4. The method of manufacturing cover glass for a mobile terminal according to claim 1 , wherein surface roughness Ra of an etched edge face is 10 nm or less.

5. The method of manufacturing cover glass for a mobile terminal according to claim 1 , wherein the etching is performed from both main surfaces.

6. The method of manufacturing cover glass for a mobile terminal according to claim 1 , wherein the desired shape is a shape including a portion having the negative curvature in part of a contour constituting the cover glass.

7. The method of manufacturing cover glass for a mobile terminal according to claim 6 , wherein the desired shape is the shape including the portion having the negative curvature on the outer circumferential portion.

8. The method of manufacturing cover glass for a mobile terminal according to claim 1 , wherein the cover glass is aluminosilicate glass containing at least one selected from the group consisting of SiO 2 , Al 2 O 3 , Li 2 O and Na 2 O.

9. The method of manufacturing cover glass for a mobile terminal according to claim 8 , wherein after cutting into the desired shape, chemical strengthening is performed on the cut glass substrate by ion exchange treatment.

Assignees

• Hoya Corp

Inventors

• Fujii Tatsuya

Classifications

• Y10T428/315

  Surface modified glass [e.g., tempered, strengthened, etc.] · CPC title

• C03C15/02 Primary

  for making a smooth surface · CPC title

• C03C3/083 Primary

  containing aluminium oxide or an iron compound · CPC title

• C03C21/002

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

• C03C2204/08

  Glass having a rough surface · CPC title