ECCENTRIC ROTOR HAVING HIGH DENSITY MEMBER, MANUFACTURING METHOD FOR THE ROTOR AND FLAT CORELESS VIBRATION MOTOR USING THE ROTOR

摘要

PROBLEM TO BE SOLVED: To obtain a desired amount of vibration by securing the movement of the center of gravity along a radial direction even though the size of a rotor is made extremely small and to secure electric insulation between a coreless electric motor coil, a printed wiring commutator and resin while using a high density member including a metal. SOLUTION: A rotor base (1) has a coreless coil electric motor mounting surface (1e), a shaft holder (1b) which is provided at the center and a coreless motor coil positioning guide (1c) which is located outside the holder, made by a high density member including a metal having a specific gravity of equal to or greater than six and is eccentrically arranged. A coreless motor coil (2) is arranged on the guide. A printed wiring commutator member (3) is provided on the high density member so that the electrically conductive portion having an electric potential is insulated from the high density member. The terminals of the coil are connected to a terminal connection pattern (3b) provided within a rotating outer periphery at the location where the printed wiring commutator member and the coil are not overlapped.