摘要 |
PROBLEM TO BE SOLVED: To obtain a desired quantity of vibration without sacrificing the thickness so much, secure an anti-shock property by firmly fixing an eccentric weight to a rotor with, and reduce the eddy current loss by forming the eccentric weight from a non-metal substance and arranging it in a magnetic field, thereby to reduce the current consumption despite a small size. SOLUTION: In this ultraminiature coreless vibrating motor, a commutator 17 is installed jointly with an eccentric rotor 15, which is formed by integrating a plurality of hollow coils with resin in one side of the inside of a casing 14 and a magnet 33 is so mounted as to face the rotor via an axial space, and a pair of brushes 66 are arranged inside of the magnet and assembled into the casing to form a bracket 22. On the anti-magnet side of the rotor 15, a weight 16 made of high-density resin with a volume resistivity of 10Ω.cm or more and a specific gravity of 10 or more is arranged.
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