REINFORCED SHEET GLASS AND MANUFACTURING METHOD THEREFOR

摘要

A thick core glass sheet (2a) with a high coefficient of thermal expansion and a thin surface glass sheet (3a) with a low coefficient of thermal expansion are placed in surface contact with each other such that the contact surfaces (2x and 3x) are in close contact. After directly bonding the glass sheets (2a and 3a) via heat-treatment, additional heat is applied such that the temperature of the surface contact portion reaches a temperature greater than or equal to the strain point of the glass sheet (2a or 3a) with the lower strain point. The glass sheets are then cooled to less than said strain point, thereby creating compressive stress in a surface section (3) corresponding to the surface glass sheet (3a) and tensile stress in a core section (2) corresponding to the core glass sheet (2a).