| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a glass substrate that is decreased in the number of defects of an aggregate of platinum group metal even if the aggregate of platinum group metal is mixed with molten glass during a manufacturing process.SOLUTION: A manufacturing method for a glass substrate comprises: as a process of processing molten glass by a glass processing device which has a wall, surrounding a vapor phase space, formed at least partially of a material including platinum group metal, a molten glass processing process in which an aggregate of volatile matter of the platinum group metal present in the vapor phase space and vaporizing from the wall is mixed as foreign matter; and an aggregate processing process of melting at least part of the aggregate mixed with the molten glass in the molten glass processing process into the molten glass. In the aggregate processing process, saturation solubility of the platinum group metal is adjusted by adjusting the concentration of oxygen contained in the molten glass by performing bubbling of the gas at least including oxygen in the molten glass in the glass processing device.SELECTED DRAWING: Figure 1 |
