Inorganic composition article
US8043706B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2008 |
| Grant date | Oct 25, 2011 |
| Priority date | — |
| Expiry date | Sep 19, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K1/0306
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An inorganic composition article used in disk substrate for information recording media, with a low melting point and a high productivity, combining superior surface characteristics capable of sufficiently dealing with a ramp load system for high density recording in both an in-plane magnetic recording system and a perpendicular magnetic recording system, having a high mechanical strength capable of enduring high speed rotation and impact, and combining both a heat expansion characteristic and heat resistance corresponding to each drive component. The inorganic composition articles contain a Li2O component and an Al2O3 component, with the percent by mass ratio of Li2O to Al2O3 (Li2O/Al2O3) being at least 0.3, include crystals, and have a compressive stress layer arranged on a surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.