Patent ID: 7141902

Claim:
A flat type vibration motor comprising: a shaft supported between a housing and a bracket assembled to a bottom of the housing; a rotor including an upper board arranged within the housing, A and B phase winding coils arranged on a top of the upper board, a weight arranged eccentrically on the top of the upper board adjacent to the winding coils and a rectifier arranged on an underside of the upper board, the rectifier having a plurality of segments electrically connected to first and second ends of the A and B phase winding coils, respectively; a stator including a lower board, a magnet arranged on a top of the lower board corresponding to the A and B winding coils and a pair of brush fingers electrically connected to a power supply for receiving external voltage and in contact with the segments; and a pattern coil arranged on the upper board for achieving electric connection between one of the segments connected to a first end of the A phase winding coil and another one of the segments connected to a second end of the B phase winding coil in order to generate electromagnetic force for rotating the rotor from an electrically disconnected section to an electrically connected section.