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AssigneeDaido Tokushuko Kabushiki Kaisha
InventorsManabu Kurosawa, Takeshi Anbo, Tatsumasa Yamada
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A motor component covered with a novel electrocoating that fails to detrimentally affects magnetic memory medium provided in a hard disc or other is provided. With enhanced edge covering ratio, an improved insulation coating is easily formed on the motor component. An insulation coating is electrodeposited on an Nd—Fe—B system plastic magnet, a stacked core of silicon steel, a die-cast motor base of aluminum or other motor component through cationic electrodeposition. The electrodeposition paint for use includes 12 ppm or less of tin content in the aqueous solution, 0.5% or less by weight of carbon black content in the aqueous solution, and, instead, has titanium dioxide and/or silicon dioxide added to pigment. The electrodeposited insulation coating, which has a specified thickness, is heated to temperatures ranging between 40° C. and 90° C. After such preliminary curing, temperatures are again heated to between 150° C. and 190° C. In the hard disc drive unit assembled of such electrodeposited components, no tin is scattered therefrom, thereby protecting memory content from collapsing, and providing enhanced anticorrosion and insulation.
A motor component for a hard disc drive, said motor component comprising either one or both of plastic magnets and laminated steel plates coated with a cation electrodeposition paint which does not contain tin.
A motor component for a hard disc drive, said motor component comprising either one or both of plastic magnets and laminated steel plates coated with a cation electrodeposition paint which contains a tin compound in an amount of 50 ppm or less.
A motor component for a hard disc drive, said motor component comprising one of plastic magnets and laminated steel plates being coated with a cation electrodeposition paint, wherein the cation electrodeposition paint is applied by electrodepositing the cationic electrocoating paint onto said motor component therefor and comprises an aqueous solution including an epoxy resin with no more than 50 ppm of a fin compound;
A motor component for a hard disc drive, said motor component comprising one of plastic magnets and laminated steel plates being-coated with a cation electrodeposition paint, wherein the cation electrodeposition paint is applied by electrodepositing the cationic electrocoating paint onto said motor component therefor and comprises an aqueous solution including an epoxy resin:
Dependencies are inferred from the claim text.