Base plate, spindle motor, disk drive device, and method for manufacturing base plate
AssigneeNidec Corporation
InventorsMichihiro ITO, Kenta MIYOSHI, Ryo FURUYA, Toshihiro HIRASAWA
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Abstract
This base plate constitutes a part of a housing of a disk drive device, and is formed from a metal plate and a die-cast part. The metal plate includes a board-shaped bottom plate portion that spreads out perpendicular to an up-down extending axis of rotation of a disk. The die-cast part covers at least a part of the bottom plate portion. Metal which constitutes the bottom plate portion is higher in rigidity than metal which constitutes the die-cast part.
Claims20
A base plate, configured as a portion of a housing of a disk drive device, wherein the base plate is formed by:
- a metal plate, having a bottom plate part, wherein the bottom plate part has a plate shape and spreads vertically with respect to a rotation axis of a disk extending in an upper-lower direction;
- and
- a die-cast part, covering at least a portion of the bottom plate part,
- wherein a metal forming the bottom plate part is higher in rigidity than a metal forming the die-cast part.
A method for manufacturing a base plate as a portion of a housing of a disk drive device, the method sequentially comprising:
- a casting process of injecting molten metal into a mold where a metal plate is placed to form a die-cast part covering at least a portion a bottom plate part and a peripheral plate part, the metal plate part having:
- the bottom plate part, having a plate shape spreading vertically with respect to a rotation axis of a disk extending in an upper-lower direction;
- and the peripheral plate part, extending upward from an outer edge of the bottom plate part to surround a periphery of the bottom plate part;
- an electro-coating process of at least forming an electro-coating film on the die-cast part and a portion of the metal plate that is exposed;
- and
- a cutting process of performing cutting machining on a surface of the die-cast part.
Dependencies are inferred from the claim text.