Master disk for magnetic transfer, magnetic recording medium and magnetic recording apparatus
US7532420B2 · kind B2 · utility
0Cited by
4References
3Claims
0Family size
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Key dates
| Filing date | Dec 21, 2005 |
| Grant date | May 12, 2009 |
| Priority date | — |
| Expiry date | Aug 19, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/865
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a master disk for magnetic transfer which has a disk-like outer shape and in the surface of which a large number of fine magnetic layer patterns are formed, wherein the relationship between the outside diameter size d (mm) of the extreme outer circumference of the magnetic layer pattern and the master disk thickness t (mm) is given by 2.04×10−3×d+0.006≦t≦8.15×10−3×d+0.024, in order to exclude the effects of bows, strains and thickness deviations of a master disk in performing magnetic transfer and ensure that accurate transfer of magnetization patterns can be performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.