Magnetic disc substrate and a magnetic disc using the same
US5585989A · kind A · utility
31Cited by
7References
26Claims
0Family size
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Key dates
| Filing date | Nov 23, 1994 |
| Grant date | Dec 17, 1996 |
| Priority date | — |
| Expiry date | Nov 23, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/59633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Using a thermoplastic norbornene type plastic as a material for the magnetic disc substrate, a magnetic disc substrate having a small deformation and a high modulus of elasticity is prepared. By optimizing the thickness of the substrate, the resonance frequency of the magnetic disc can be elevated to a level higher than the servo band. As a result, a magnetic disc substrate can form a servo mark having a high positional precision, and can carry out tracking with high precision.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.