Substrate for information recording media and manufacturing method thereof, and information recording medium
US7040953B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2002 |
| Grant date | May 9, 2006 |
| Priority date | — |
| Expiry date | Jan 20, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/50
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There are provided a substrate for information recording media and a manufacturing method thereof, according to which the projection height of minute undulations formed on the substrate surfaces can be made more uniform, and variation in the projection density can be suppressed. First, chemical strengthening treatment is carried out on a glass substrate that has been prepared by processing a sheet-shaped starting material glass plate into a predetermined shape. Then, precision polishing is carried out on the glass substrate that has been subjected to the chemical strengthening treatment, such that a polishing amount in a thickness direction of the glass substrate is within a predetermined range. Finally, surface washing is carried out on the glass substrate that has been subjected to said precision polishing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.