| 摘要 |
PROBLEM TO BE SOLVED: To obtain high corrosion resistance and superior dimensional precision without decreasing specific gravity, and reduce manufacturing cost. SOLUTION: A weight 10 fixed to the output shaft 20 of a vibration motor 18 is an injection molded object obtained by injection-molding injection material in which a specified percentage of thermosetting resin binder is added to tungsten (W) powder and kneaded. The compound percentage of tungsten powder in the weight 10 is preferably 80-97.5 wt.%, and the average grain diameter may be in a range of 1-80μm and is preferably at most 50μm. As the resin binder, e.g. nylon 6, nylon 66, polyphenol sulfide(PPS), epoxy, etc., are used preferably. Nylon 12 is more preferable.
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