Method of producing magnetic hard disk substrate with textured surface
US6705927B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2002 |
| Grant date | Mar 16, 2004 |
| Priority date | — |
| Expiry date | Jun 15, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24D11/006
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A polishing tape makes use of a foamed material such as polyurethane foam attached to a plastic backing material. The foamed material is elastic and some of its gas holes formed inside but near one of its surfaces are exposed externally. Because of its elastic nature, it can be deformed even if there are abnormally large abrading particles contained in a liquid slurry and such abrading particles do not become embedded in the target surface being textured. These externally exposed gas holes can also serve to absorb the debris generated by the texturing and to protect the target surface from being scratched thereby. Such a tape is used for a texturing process while dropping a liquid slurry containing abrading particles and rotating the disk substrate and pressing the tape against the target surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.