Patent ID: 9202505
Filing Date: 2015-12-01
Classification: C03C,G11B

Abstract:
1. A method for manufacturing a glass substrate for a magnetic recording medium, the method comprising: providing a glass substrate having a chamfered surface formed on an inner peripheral end surface and/or an outer peripheral end surface of the glass substrate; and polishing a principal surface of the glass substrate with use of a polishing pad having a concave groove formed in a surface of the polishing pad for supplying a polishing solution, wherein the polishing is performed in the following condition: where θd is an angle defined by the chamfered surface and a plane in parallel to a thickness direction of the glass substrate on an inner side portion of the glass substrate, and θp is an angle defined by a side surface of the concave groove and a plane in parallel to a thickness direction of the polishing pad on an inner side portion of the polishing pad.