Advanced mechanical texture process for high density magnetic recording media
US6129612A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1998 |
| Grant date | Oct 10, 2000 |
| Priority date | — |
| Expiry date | Sep 18, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B37/048
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Method for removing random scratches formed during the polishing of magnetic recording media, and for disposing on the surface of the media a near-circumferential texture which increases the recording reliability of the media while simultaneously reducing its failure rate. The present invention teaches the application of a low unit load force to a large surface pad and polishing tape combination while in contact with a rotating disk surface that is also moving in a circumferential direction to completely remove the random scratches previously formed by a polishing step. The scratches are removed with the aid of a specially designed, extremely fine alumina slurry composition which prevent producing similar size circumferential scratches at the high surface speeds. The methodology provides for a smoother disk surface than prior known super-polish/texture methodologies. The methodology taught by the principles of the present invention is inherently more uniform than known batch process for polishing and texturing disks and leads to increased efficiency of media manufacturing through reduced manufacturing and post-deployment failures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.