Patent ID: 6743529
Filing Date: 2004-06-01
Classification: C03C,G11B,Y10S

Abstract:
A process for producing a glass substrate for a magnetic recording medium by forming a surface roughness in a main surface of a glass plate that has been formed into a disk shape, which comprises:imparting a processing mark having a permanent strain to the main surface of the glass plate in a circumferential direction thereof; and chemically etching the whole main surface of the glass plate, so as to form the surface roughness, wherein the processing mark is formed by rubbing the main surface of the glass plate with a processing tape in a circumferential direction of the glass plate, while supplying a processing fluid comprising a slurry to the main surface of the glass plate, and the surface roughness is formed based on a difference in etching rate between the portion having the processing mark and the portion not having the processing mark.