| 摘要 |
A manufacturing method of a glass substrate for magnetic disk including a pair of principal surfaces is disclosed The method includes the steps of: dropping process for dropping a lump of molten glass; pressing process for forming a sheet glass material by sandwiching simultaneously the lump from both sides of the dropping path of the lump with surfaces of the pair of dies facing together, and performing press forming to the lump; and machining process for machining the sheet glass material, wherein the press forming sandwiches the lump while moving the pair of dies in the direction of drop of the lump so that relative speed of the lump to that of the pair of dies approaches zero.
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