BASE PLATE, SPINDLE MOTOR, DISK DRIVE DEVICE, AND BASE PLATE MANUFACTURING METHOD
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United States of America
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Issued Date -
Nov 14, 2024
app pub date -
May 8, 2024
filing date -
May 8, 2024
priority date (Note) -
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status (Latency Note)
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Abstract
A base plate becomes a part of a housing of a disk drive device and is made of a metal die-cast member. The base plate includes a bottom wall portion and a cylindrical wall portion. The bottom wall portion extends perpendicular to a rotation axis of a disk extending in a vertical direction. The cylindrical wall portion protrudes upward from an upper surface of the bottom wall portion along the rotation axis and has a shaft through hole through which a shaft is inserted. The cylindrical wall portion has an annular stepped portion that protrudes radially outward from an outer peripheral surface of a root portion. A processed surface is formed on at least a part of an outer peripheral surface of the stepped portion.
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