Patent ID: 9085479
Filing Date: 2015-07-21
Classification: B24B,C03B,G11B

Abstract:
1. A manufacturing method of a glass substrate for a magnetic disk, comprising: cutting molten glass flowing from a molten glass outflow port to form a lump of the molten glass that is separated from the molten glass flowing out from the molten glass outflow port; after the cutting of the molten glass, forming a sheet glass material by performing press forming to catch the lump while the lump is falling and sandwich the lump between surfaces of a pair of dies from both sides of a falling path of the lump, the dies being disposed opposite each other moving horizontally, and the dies being set to substantially a same temperature, such that the surfaces of the pair of dies are brought into close contact at approximately identical timing; and polishing a principal surface of the sheet glass material by pressing a polishing pad against the principal surface of the sheet glass material while supplying a polishing solution including a polishing material between the sheet glass material and the polishing pad, and relatively moving the sheet glass material and the polishing pad.