Patent ID: 9102566
Filing Date: 2015-08-11
Classification: C03B,C03C,Y02P

Abstract:
1. A method of manufacturing a reinforced plate glass, the method comprising the steps of: making a plate glass made of an aluminosilicate glass comprising 50 to 80% of SiO forming a compression stress layer on each plate surface of the plate glass by chemical reinforcement, the compression stress layers having a thickness of 23 to 100 μm and a compression stress value of 610 to 1500 MPa; and dividing, after the forming of the compression stress layers, the plate glass chemically reinforced by scribe cutting, the scribe cutting comprising the steps of forming a scribe line on a plate surface and applying a tensile stress to the scribe line to divide the plate glass, to obtain the reinforced plate glass which comprises a plate end face comprising a region where a compression stress is formed and a region where a compression stress is not formed, wherein a stress distribution in a plate thickness direction of one of the compression stress layers of the plate surfaces is limited in accordance with a compression stress function represented by a compression stress value of the respective plate surface, the thickness of the one of the compression stress layers, and a thickness region where the compression stress is not formed and wherein the compression stress function for the one of the compression stress layers is obtained by dividing a product of the compressive stress value of the respective plate surface and the thickness of the one of the compression stress layers by the thickness of the region where the compression stress is not formed, and a value calculated by the compression stress function is 40 MPa or less.