| 摘要 |
PROBLEM TO BE SOLVED: To attain cost reduction and high rotational accuracy of a dynamic pressure bearing device. SOLUTION: A bearing member 7 is an injection-molded article whose outer peripheral surface has a mounting face for a base member as a constructional element of a motor. In the bearing member, at least an area of an inner peripheral surface facing a radial bearing clearance is formed of an electro-cast part 8. The electro-cast part 8 is a metallic layer precipitated and formed on a master surface by electrocasting. Because of the characteristics of the electrocasting, high inner peripheral surface accuracy can be secured at low cost. COPYRIGHT: (C)2008,JPO&INPIT
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