Method for manufacturing a magnetic disk including a glass substrate
US6363599B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 4, 1999 |
| Grant date | Apr 2, 2002 |
| Priority date | — |
| Expiry date | Aug 4, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/15
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method for making magnetic disks comprises the steps of: applying a protective layer of material on a sheet of glass; b) cutting the sheet of glass into glass squares; c) stacking the glass squares; d) removing a circular core from the stack of glass squares, thereby defining the inner diameter of the glass substrates being formed; e) using a cutting annulus to cut through the stack of glass squares, thereby forming a stack of glass disks; f) subjecting the stack of glass disks to an edge polishing process to round the corners of the glass disks both at the inner and outer diameters; h) unstacking the glass disks; i) removing the protective layers from the glass disks; j) subjecting the glass disks to a chemical strengthening step; and k) sputtering an underlayer, magnetic layer and protective overcoat onto the glass substrate to thereby form a magnetic disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.