Keating & Bennett, LLP
Base unit and disk drive apparatus
Provided is a base unit for use in a disk drive apparatus and to be attached to a cover portion to define an enclosed space to be filled with a gas having a density lower than that of air. The base unit includes a base portion arranged to extend radially and support a motor capable of rotating about a central axis extending in a vertical direction; and a lateral wall portion arranged to extend axially upward from an edge portion of the base portion. The base portion includes a part accommodating portion defined by a through hole arranged to pass through the base portion in an axial direction, and arranged to accommodate at least a portion of a predetermined part; and a seal member arranged to close an end portion of the through hole on one axial side. The base portion and the lateral wall portion include a base made of a metal; a coating portion formed by electrocoating a surface of the base with at least a resin; and at least one exposed portion where the surface of the base is exposed. The at least one exposed portion is arranged in at least one of a predetermined first region and a second region. The first region lies on an axially upper end portion of the lateral wall portion, the axially upper end portion being opposite to the cover portion. The second region lies on an outer surface of the base portion, and is arranged to extend outward from an edge of the part accommodating portion so as to have a predetermined width.
NIDEC CORPORATION
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H02K G11B H02K G11B H02K G11B G11B G11B G11B H02K
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Hiroki
Yamada