Mobile-display cover glass and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-9701562-B2
Application number	US-201314423233-A
Country	US
Kind code	B2
Filing date	Sep 25, 2013
Priority date	Oct 10, 2012
Publication date	Jul 11, 2017
Grant date	Jul 11, 2017

Abstract

Provided is a mobile-display cover glass less susceptible to damage from impact caused upon dropping of a mobile display. A mobile-display cover glass ( 1 ) is a mobile-display cover glass configured to cover a display region ( 2 a ) and at least a portion of a side surface ( 2 b ) of a mobile display ( 2 ). The mobile-display cover glass ( 1 ) includes a flat sheet-like front portion ( 11 ) and a side portion ( 12, 13 ). The front portion ( 11 ) is configured to be disposed in front of the display region ( 2 a ). The front portion ( 11 ) extends in a first direction and a second direction perpendicular to the first direction. The side portion ( 12, 13 ) is configured to be disposed lateral to the mobile display ( 2 ). The side portion ( 12, 13 ) includes a bent portion ( 12 a, 13 a ). The bent portion ( 12 a, 13 a ) bends backward from one end of the front portion ( 11 ) in the first direction. A corner ( 12 c, 13 c ) of the side portion ( 12, 13 ) has a rounded shape.

First claim

The invention claimed is:

1. A method for manufacturing a mobile-display cover glass comprising the steps of:
preparing a rectangular flat glass sheet having a corner of a rounded shape;
placing the flat glass sheet on a forming die having a flat forming surface so that a middle portion of the flat glass sheet in a first direction is located on the forming surface and an end portion of the flat glass sheet in the first direction is located outside the forming surface;
placing a heat-insulating member on the middle portion of the flat glass sheet to hold the middle portion between the forming die and the heat-insulating member; and
pressing down the end portion of the flat glass sheet with the application of heat while holding the middle portion between the forming die and the heat-insulating member to form a front portion and a side portion; wherein
each of the forming die and the heat-insulating member includes at least one through hole, and the method further comprises the step of:
feeding a coolant through the through hole of the forming die and the through hole of the heat-insulating member during the application of heat and the forming of the front portion and the side portion in order to control a temperature of the forming die and the heat-insulating member.

2. The method for manufacturing the mobile-display cover glass according to claim 1 , wherein
the corner having a rounded shape has an arcuate contour, and
the relation L 1 >L 2 is satisfied where
L 1 represents a length of the side portion at a part thereof other than the corner, the length running from a starting point of bending of a bent portion to an end of the side portion and measured along an outside surface of the side portion, and
L 2 represents a length of the corner having a rounded shape, the length being measured on the outside surface of the side portion along a second direction that is perpendicular to the first direction.

3. The method for manufacturing the mobile-display cover glass according to claim 2 , wherein the relation L 1 ≧(3/2)·L 2 is satisfied.

4. The method for manufacturing the mobile-display cover glass according to claim 2 , wherein the contour of the corner having a rounded shape has an arcuate shape having a radius of curvature of 0.1 mm to 5.0 mm.

5. The method for manufacturing the mobile-display cover glass according to claim 1 , wherein the mobile-display cover glass has a thickness within a range of 0.2 mm to 1.5 mm.

6. The method for manufacturing the mobile-display cover glass according to claim 1 , wherein the relation L 3 >L 2 is satisfied where
L 2 represents a length of the corner having a rounded shape, measured on an outside surface of the side portion along a second direction that is perpendicular to the first direction, and
L 3 represents a length of the corner having a rounded shape, measured on the outside surface of the side portion along the first direction.

7. The method for manufacturing the mobile-display cover glass according to claim 6 , wherein the corner having a rounded shape has an elliptically arcuate contour having a major axis parallel to the first direction in development view.

Assignees

• Nippon Electric Glass Co

Inventors

• Wada Masanori
• Odani Osamu
• Ikemoto Masayuki

Classifications

• C03B23/0307 Primary

  Press-bending involving applying local or additional heating, cooling or insulating means · CPC title

• C03B23/0302

  between opposing full-face shaping moulds · CPC title

• C03B23/0305 Primary

  Press-bending accelerated by applying mechanical forces, e.g. inertia, weights or local forces · CPC title

• C03B23/0252

  by gravity only, e.g. sagging (C03B23/035 takes precedence) · CPC title

• H04B1/3888

  Arrangements for carrying or protecting transceivers · CPC title