STRENGTHENED GLASS PLATE AND PRODUCTION PROCESS THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a strengthened glass plate and production process therefor in which the end faces are strengthened as well as the productivity is good.SOLUTION: The strengthened glass plate according to an aspect 1 of the present invention includes: a principal surface compressive stress layer formed on a respective first principal surface and second principal surface oppositely facing each other; and an end surface compressive stress layer formed on an end surface connecting the first principal surface and the second principal surface, and in which setting the ion exchange depth of the principal surface compressive stress layer as dp (μm) and the ion exchange depth of the end surface compressive stress layer as de (μm), de