公开(公告)号：US10889521B2

公开(公告)日：2021-01-12

申请号：US16514447

申请日：2019-07-17

Applicant: AGC INC.

Inventor： Maya Hatano ,  Kazuhiko Yamanaka ,  Satoshi Kanasugi

IPC: C03B23/025 ,  C03C21/00

Abstract: A glass plate, curved around a first axis, has a first surface being concave and a second surface being convex. In a cross sectional view of a plane perpendicular to the first axis, both end portions of the second surface are chemically strengthened. Compressive stress produced by ion exchange in the both end portions of the second surface is larger than that of the first surface. An X axis includes a line segment connecting one end point and a point, most distant from the one end point, on the cross section of the second surface. A Y axis passes a center point of the line segment, and positive direction is from a first surface toward a second surface. A second-order coefficient of a quadratic curve that approximates second-order differential values of a locus of a partial shape in a positive Y value region in the cross section is negative.