Light texture process of fabricating a magnetic recording media
US6103339A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1998 |
| Grant date | Aug 15, 2000 |
| Priority date | — |
| Expiry date | Jan 6, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Nowadays, in fabricating a magnetic recording medium, a disk substrate is first mechanically polished to form an even surface. Next, a laser texturing process is performed to produce a textured annular landing zone on the disk substrate. A magnetic layer is then formed on the disk substrate to complete the fabrication process. However, abnormal asperity usually remains on the surface of the disk substrate. Further, as the amount of exposure time in the air increases, an oxide film is inevitably formed on the surface of the disk substrate. Both of them degrade the surface smooth of the disk substrate, resulting in poor control of the size and structure of the laser texture. In addition, due to the irregular distribution of the mechanical polished texture on the disk substrate, a subsequently formed magnetic layer can not easily achieve the desired properties. This invention therefore provides a light texture process for fabricating a magnetic recording medium. The process is characterized in forming light textures by a two-step light texturing process before forming the laser texture on a disk substrate. The process is intended to remove abnormal asperity and oxide film on the disk …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.