Magnetic disk, substrate therefor and process for preparation thereof
US4738885A · kind A · utility
36Cited by
6References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 24, 1986 |
| Grant date | Apr 19, 1988 |
| Priority date | — |
| Expiry date | Feb 24, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24355
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Disclosed is a substrate for a magnetic disk, which comprises a ceramic substrate formed by subjecting a ceramic molded body to hot isostatic pressing in an inert atmosphere and subsequently to polishing treatment. In this magnetic disk substrate, the number of void defects is greatly reduced, and the substrate per se is excellent in the heat resistance and deformation resistance. If this substrate is used, there is provided a magnetic recording disk of a high reliability where recording can be performed at a high density with precise writing and reading.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.