Method for manufacturing glass substrate for magnetic disk and method for manufacturing magnetic disk
US8613206B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 15, 2007 |
| Grant date | Dec 24, 2013 |
| Priority date | — |
| Expiry date | May 14, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C21/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention provides a method for manufacturing a glass substrate for a magnetic disk comprising a chemical strengthening step. The method provides a glass substrate for a magnetic disk that can suppress the occurrence of very small waves in cooling a glass substrate after the chemical strengthening step, and, while preventing troubles such as head crush and thermal asperity, can realize lowered flying height of a magnetic head and high-density information recording, and is particularly suitable for application to small-size magnetic disks for portable information equipment. In the step of cooling after the chemical strengthening step, cooling treatment is carried out in which the glass substrate is brought into contact with a treatment liquid containing a melt of a material having a solidification temperature below that of a chemical strengthening salt. The temperature of the treatment liquid is regulated to be below the temperature of the chemical strengthening salt melted liquid in the chemical strengthening step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.