Toughened glass substrate and process for producing same

摘要

Provided is a tempered glass substrate formed by a float method, comprising a bottom surface and a top surface, wherein a compression stress value of the bottom surface is larger than a compression stress value of the top surface.

主权项

1. A method of producing a tempered glass substrate, comprising:
a forming step comprising forming glass into a glass sheet by a float method to obtain a glass substrate to be tempered; a polishing step comprising (1) polishing only a top surface of the glass substrate to be tempered, or (2) polishing the top surface and a bottom surface of the glass substrate to be tempered so that a polishing thickness of the top surface is larger than a polishing thickness of the bottom surface; and a tempering step comprising applying an ion exchange treatment to the glass substrate to be tempered so that the bottom surface has a larger compression stress value than the top surface to obtain the tempered glass substrate.