Substrate for a magnetic disc and method manufacturing same
US4716078A · kind A · utility
9Cited by
11References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1984 |
| Grant date | Dec 29, 1987 |
| Priority date | — |
| Expiry date | Aug 8, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A substrate for magnetic discs, which are to be used as external storage in data processors, is formed from glass-like carbon materials by themselves or contained in a thermosetting resin matrix. The glass-like carbon materials have excellent thermal resistance, can be finished to a mirror-like surface, and have less surface defects than aluminum substrates. Magnetic materials can be adhered directly onto the surface of such substrates shaped in the form of a disc. The resulting disc has good hardness, is resistant to elevated temperatures, is less likely to deform, and is low in cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.