公开(公告)号：US20200055771A1

公开(公告)日：2020-02-20

申请号：US16663534

申请日：2019-10-25

Applicant: AGC Inc.

Inventor： Yosuke TAKEDA ,  Toru IKEDA ,  Naofumi AOYAMA ,  Tatsuya MIYAJIMA ,  Yoichi SERA

IPC: C03C17/25 ,  C03C17/34

Abstract: The present invention relates to a film-attached glass substrate, characterized by: being provided with a glass substrate having two primary surfaces each having a compressive stress layer, and a film containing 1 at % or more of K disposed on one of the primary surfaces of the glass substrate; and the ratio of the difference in the amount of K in the compressive stress layer between the primary surfaces, the ratio being represented by formula (1), being −0.027 to 0.027. Formula (1): Ratio of difference in amount of K of compressive stress layer between primary surfaces=(amount of K in first primary surface−amount of K in second primary surface)/[(amount of K in first primary surface+amount of K in second primary surface)/2]