Linear vibration motor

1. A linear vibration motor comprising:

a stator part comprising a magnet and a case having an inner space and a coupling part;

a vibrator part comprising a coil disposed to face the magnet and a printed circuit board electrically connected to the coil, and received in the case to thereby linearly vibrate; and

an elastic member comprising one end fixedly coupled to the stator part and the other end fixedly coupled to the vibrator part,

wherein the printed circuit board comprises:

a power supplying part fixedly coupled to the stator part and comprising a power connection pad;

a mounting part extended from the power supplying part and coupled to the coupling part of the case;

an elastic part extended from the mounting part in a spiral direction so as to have elastic force; and

a power applying part formed at one end of the elastic part and electrically coupled to the coil,

wherein the printed circuit board is partially coupled to the coupling part of the case,

wherein the coupling part comprises:

a penetration groove formed so that the mounting part of the printed circuit hoard is fitting-coupled thereinto in a width direction; and

a plurality of support parts formed to protrude from both sides of the penetration groove toward the bracket and each comprising catching jaws formed to support the mounting part of the printed circuit board,

wherein the mounting part comprises predetermined grooves formed inwardly in the width direction at both sides thereof so as to face the catching jaws.

2. The linear vibration motor as set forth in claim 1 , wherein the stator part further includes:

a bracket coupled to a lower portion of the case to thereby compart the inner space of the case.

3. The linear vibration motor as set forth in claim 2 , wherein the magnet includes:

a first magnet coupled to a surface of the case; and

a second magnet coupled to a surface of the bracket.

4. The linear vibration motor as set forth in claim 3 , wherein the stator part further includes a plate yoke coupled to the first magnet.

5. The linear vibration motor as set forth in claim 3 , wherein the stator part further includes a plate yoke coupled to the second magnet.

6. The linear vibration motor as set forth in claim 1 , wherein the vibrator part further includes:

a weight body coupled to an outer peripheral surface of the coil; and

a cylindrical yoke coupled between the weight body and the coil to thereby increase magnetic force of the magnet, and

wherein the other end of the elastic member and an upper portion of the yoke are fixedly coupled to each other.

7. The linear vibration motor as set forth in claim 1 , wherein the elastic member includes:

an upper, plate part fixedly coupled to an upper surface of an inner side of the stator part;

a lower plate part fixedly coupled to an upper portion of the vibrator part; and

a plurality of bending parts connecting the upper and lower plate parts to each other and generating elastic force, and elastically supports linear movement of the vibrator part.

8. The linear vibration motor as set forth in claim 1 , further comprising a damper coupled to a lower portion of the power supplying part of the printed circuit board so as to face the stator part to thereby prevent noise and impact from being generated at the time of contact between the printed circuit board and the stator part.