Patent ID: 6806603
Filing Date: 2004-10-19
Classification: H02K

Abstract:
A flat type vibration motor for generating vibration, comprising:a stator including a lower board with a terminal unit, the terminal unit being supplied with electric current from an external power supply, and a magnet having N and S poles alternatingly magnetized in a periphery of the magnet; a shaft having a lower end fixedly pressed into an upper central portion of the stator and an upper end assembled into a lower central portion of a housing; a rotor rotatably assembled between the stator and the housing, wherein the rotor includes an insulator of eccentric mass, which integrally contains at least one winding coil corresponding to the magnet and a weight arranged eccentrically adjacent to the winding coil, and an upper board mounted on an underside of the insulator; a plurality of brushes electrically connected with the terminal unit and having lower ends fixed to the stator; a plurality of annular slip rings arranged on an underside of the upper board to have an axis concentric with the shaft, each of the rings contacting an upper end of each of the brushes; and an Integrated Circuit (IC) chip for converting the direction of electric current flowing through the winding coil by alternating the polarity of electric current which is introduced to the slip rings via the brushes and then supplied to the winding coil.