Glass spacer and hard disk drive apparatus
US10783921B2 · kind B2 · utility
5Cited by
0References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 1, 2018 |
| Grant date | Sep 22, 2020 |
| Priority date | — |
| Expiry date | Oct 1, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B25/043
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In order to suppress the occurrence of adhesion between magnetic disks and spacers when the magnetic disks and the spacers are removed from a hard disk drive apparatus in which the magnetic disks and the spacers are installed, a surface roughness Ra of a main surface of a ring-shaped glass spacer to be arranged in contact with a magnetic disk is set to be not larger than 1.0 μm, and an average inclination RΔa of the main surface is set to be at least 0.02.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.