Glass substrate and method for manufacturing glass substrate

Abstract

The glass substrate (10) of the present invention has a first main surface (11) and a second main surface (12) facing opposite to the first main surface (11). The first main surface (11) has a concave cavity (13). The cavity (13) has a bottom surface (13a) and a side surface (13b). If the depth from the first main surface (11) to the center of the bottom surface (13a) is set as b, then the side surface (13b) is the portion with a depth of 0.9b or less from the first main surface (11). The side surface (13b) has a conical surface (13b1) at the junction with the bottom surface (13a). The deeper the conical surface (13b1) is from the first main surface (11), the more it is inclined towards the inside of the opening edge of the cavity (13) when viewed from a direction perpendicular to the first main surface (11). The average value of the ratio (a / b) of the width (a) to the depth (b) of the side (13b) is greater than 0 and less than 1.0, and the average value of 3σ (the standard deviation of σ) is greater than 0 and less than 1.0.

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