| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid bearing device which has high molding precision and dimensional stability, and includes a hub part materializing low manufacturing cost. SOLUTION: An annular gate 14 is provided to a part corresponding to an outer diameter end of a lower end surface 10c1 of a collar 10c in a cavity 15. By filling molten resin P into the cavity 15 through the annular gate 14, resin made hub part 10 is molded. The hub 10 formed by the injection molding exhibits resin orientation to a radial direction over its whole circumstance. An annular gate mark 16 is formed in the outer diameter end of the lower end surface 10c1 of the collar 10c in the hub 10. COPYRIGHT: (C)2007,JPO&INPIT
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