Thin substrate built-in hard disk drive and base plate member for thin substrate built-in hard disk drive
US12033665B2 · kind B2 · utility
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Key dates
| Filing date | Apr 20, 2023 |
| Grant date | Jul 9, 2024 |
| Priority date | — |
| Expiry date | Apr 20, 2043 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C21/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An example thin substrate built-in hard disk drive includes a magnetic disk in a disk shape having a through-hole at the center, a spindle motor inserted into the through-hole of the magnetic disk and co-rotatably supporting the magnetic disk, and a base plate made of an aluminum alloy and supporting the spindle motor. The base plate has a metallographic structure in which a perimeter of a second phase particle having a longest diameter of 10 μm or more is 3 mm/mm2 or more, and the number of second phase particles having a longest diameter of 500 μm or more is 0 particles/mm2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.