Process for producing glass substrate for magnetic recording medium and glass substrate for magnetic recording medium obtained by the same
US6743529B2 · kind B2 · utility
27Cited by
4References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 17, 2001 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Dec 17, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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, includes: 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.