METHOD FOR MANUFACTURING TEMPERED GLASS SUBSTRATE, AND TEMPERED GLASS SUBSTRATE

摘要

Provided is a method for manufacturing a tempered glass substrate, whereby a direction of warping can be controlled. The present invention is provided with: a film forming step for forming a first ion exchange suppressing film 2a on a first principal face 11a of a glass substrate 11 having first and second principal faces 11a, 11b facing each other, and forming a second ion exchange suppressing film 2b on the second principal face 11b; and a tempering step for chemically tempering the glass substrate 11 by an ion exchange method and thereby obtaining a tempered glass substrate 1. The present invention is characterized in that in the film forming step, the difference in film thickness between the first ion exchange suppressing film 2a and the second ion exchange suppressing film 2b is set and the first and second ion exchange suppressing films 2a, 2b are formed so that the absolute value of the quantity ∆(CS × DOL)/T2 defined by the thickness T of the tempered glass substrate 1 and the difference ∆(CS × DOL) between the product of the surface compressive stress (CS) and compressive stress depth (DOL) of a first compressive stress layer 1a of the tempered glass substrate 1 and the surface compressive stress and compressive stress depth of a second compressive stress layer 1b thereof is 1.5 × 109 Pa/m to 9 × 109 Pa/m.