Vibration motor and mobile communication device using same

A mobile communication device, comprising a circuit board and a vibration motor, wherein the vibration motor comprises a housing, a vibrator accommodated in the housing, a driving apparatus driving the vibrator to vibrate, and an elastic part elastically supporting the vibrator;

• wherein the driving apparatus is a secondary coil accommodated in the housing, the vibrator is provided with a magnet steel corresponding to the coil;
• the vibration motor further comprises a primary coil, disposed outside the housing, corresponding to the secondary coil, and spaced from the secondary coil;
• and the primary coil generates an alternating electromagnetic field, to cause the secondary coil to generate an induced electromotive force, and cause relative vibration between the vibrator and the secondary coil;
• wherein the primary coil is disposed on the circuit board;
• the vibrator comprises a counterweight block, and a magnet steel corresponding to the secondary coil and disposed on the counterweight block, with a through hole running through the counterweight to receive the magnet steel, the counterweight block comprising a lower surface corresponding to the circuit board;
• wherein the housing comprises a top wall, a bottom wall disposed opposite to the top wall, and a side wall connecting the top wall and the bottom wall;
• the secondary coil is disposed on the bottom wall;
• wherein the elastic part comprises two C-type springs respectively disposed at two sides of the vibrator, and each C-type spring comprises a first fixed portion connected to the vibrator, a second fixed portion connected to the second fixed portion;
• wherein the first fixed portion and the second fixed portion are disposed on two opposite sides of the counterweight block.