Method of processing surface of glass substrate for magnetic disk and suspension with abrasive particles therefor
US6491572B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 2000 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Dec 3, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B21/004
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A glass substrate for a magnetic disk has one or both of its surfaces processed by applying a suspension of a specified kind onto the surface to be processed while the substrate is rotated and a polishing tape is pressed and run against the surface to be processed. The suspension includes abrasive particles with average diameter selected according to the purpose of the processing and an aqueous solution containing a reacting liquid capable of causing a solid phase reaction at contact boundary surfaces between the surface of the glass substrate and these abrasive particles. The polishing tape is removed from the glass substrate when the polishing is over but while the tape is still running and the glass substrate is rotating. The supplying of the suspension is thereafter stopped and a washing liquid such as water is applied to the polished surface or surfaces while the substrate is still rotating. Both surfaces of a glass substrate may be polished at the same time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.