Glass substrate for magnetic recording medium and its use
US8652660B2 · kind B2 · utility
3Cited by
1References
25Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2011 |
| Grant date | Feb 18, 2014 |
| Priority date | — |
| Expiry date | Dec 20, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B5/73921
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An aspect of the present invention relates to a glass substrate for a magnetic recording medium, which is comprised of glass with a glass transition temperature of equal to or greater than 600° C., an average coefficient of linear expansion at 100 to 300° C. of equal to or greater than 70×10−7/° C., a Young's modulus of equal to or greater than 81 GPa, a specific modulus of elasticity of equal to or greater than 30 MNm/kg, and a fracture toughness value of equal to or greater than 0.9 MPa·m1/2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.