| 摘要 |
The glass substrate manufacturing method according to the present invention, whereby distortion is less prone to occur in a glass substrate and unevenness of the principal surface of a glass substrate is less prone to form, is provided with: a molten glass treatment step in which, when molten glass is treated in a glass treatment device in which a gas-phase space is formed by introduction of the molten glass and at least a portion of a wall of the glass treatment device is made of a platinum-group metal, aggregates of platinum-group metal volatile matter volatilized from a wall of the glass treatment device and present in the gas-phase space mix into the molten glass as foreign matter; and an aggregate treatment step for reducing the size of the aggregates so that the ratio of the number of aggregates having a maximum length of 50 µm or less among the aggregates mixed into the molten glass in the molten glass treatment step is at least 70%. The total volume of the glass substrate in the glass substrate layered body according to the present invention is at least 0.1 m3, and the ratio of the number of aggregates having a maximum length of 50 µm or less among all platinum-group metal aggregates included in the glass substrate is at least 70%. |
