| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical coreless motor as a vibration motor which is used for a portable information apparatus and can realize a slender shape while problems in a power consumption, an inclination of a shaft, a motor efficiency, mass-productivity, etc., can be avoided. SOLUTION: This cylindrical coreless motor comprises a frame 21, an inner pipe 26, a magnet 25, a cylindrical coil 14, a shaft 11, an outer bearing 27 and an inner bearing 28. The inner bearing 28 has an outer diameter approximately same as that of the inner pipe 26 and is arranged inside the magnet 25 with the inner pipe 26 in an axial direction. Or, the inner bearing 28 is formed by insert molding of resin at a position inside the magnet 25 where it is arranged with the inner pipe 26 in the axial direction and the magnet 25 is connected to the inner pipe 26 or the frame 21.
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