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 contact and heat-treated such that the temperature of the contact portion reaches a temperature greater than or equal to the softening point of the glass sheet (2a or 3a) with the lower softening point, thereby fusing the glass sheets (2a and 3a) to each other. Next, the glass sheets are cooled to below the strain point of the glass sheet (2a or 3a) with the lower 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).