Thin substrate built-in hard disk drive and base plate member for thin substrate built-in hard disk drive

Thin substrate built-in hard disk drive and base plate member for thin substrate built-in hard disk drive

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 supportin...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Kitawaki, Kotaro, Hatakeyama, Hideyuki, Kumagai, Wataru, Sakamoto, Ryo
Format: Patent
Sprache:eng
Schlagworte:
ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
METALLURGY
PHYSICS
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung: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.