Base member and method of manufacturing the same, spindle motor, and hard disk drive device
AssigneeMINEBEA MITSUMI Inc.
InventorsAkihiko SUZUKI, Tadashi AKAHORI
Life of this patent
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Abstract
A base member serving as a part of a housing of a hard disk drive device. The base member includes a base body being a cast product, a machined surface obtained by machining a part of the base body at a side of an interior of the housing, an impregnating agent filled into a casting cavity exposed at the machined surface, and a coating film covering a surface including the machined surface of the base body.
Claims17
A base member serving as a part of a housing of a hard disk drive device, the base member comprising:
- a base body being a cast product;
- a machined portion obtained by machining a part of the base body at a side of an interior of the housing;
- an impregnating agent filled into a casting cavity exposed at the machined portion;
- and
- a coating film covering a surface including the machined portion of the base body.
A method of manufacturing a base member serving as a part of a housing of a hard disk drive device, the method comprising:
- molding a base body by casting;
- machining a part of the base body at a side of an interior of the housing and forming a machined portion;
- impregnating by filling an impregnating agent into a casting cavity exposed at the machined portion after the machining;
- and
- coating by forming a coating film at a surface including the machined portion of the base body.
A base member serving as a part of a housing of a hard disk drive device, the base member comprising:
- a base body being a cast product;
- a machined portion obtained by machining a part of the base body at a side of an interior of the housing;
- a first casting cavity exposed at the machined portion, the first casting cavity having an outermost diameter being equal to or smaller than 20 μm;
- a second casting cavity exposed at the machined portion, the second casting cavity having an outermost diameter being larger than 20 μm;
- an impregnating agent filled into both first and second cavities;
- and
- a coating film covering a surface including the machined portion of the base body.
Dependencies are inferred from the claim text.