METHOD OF MANUFACTURING BEARING MEMBER, FLUID DYNAMIC PRESSURE BEARING DEVICE USING BEARING MEMBER MANUFACTURED BY THE METHOD, SPINDLE MOTOR, AND RECORDING DISK DRIVE DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent an electrolyte from intruding and remaining in a bearing member without lowering machining accuracy and machining efficiency when a dynamic pressure generating groove is formed in the bearing member made of a porous material by electrochemical machining.

SOLUTION: After a porous intermediate member is impregnated with a water-soluble liquid or water, the dynamic pressure generating groove is formed in the surface of the intermediate member by electrochemical machining. Then, the water-soluble liquid or water absorbed in the intermediate member is removed to form the bearing member.

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