Flat-type vibration motor

1. A flat-type vibration motor comprising:

a rotor including a winding coil, a first substrate having a circuit pattern formed on a surface thereof and electrically connected to the winding coil, and a holder coupled to the first substrate by injection molding; and

a shaft including the rotor rotatably coupled thereto and forming a rotational axis of the rotor,

wherein the circuit pattern includes a sealing pattern formed along an outline of the holder.

2. The flat-type vibration motor of claim 1 , wherein the rotor includes

a weight body eccentrically attached to the surface of the first substrate.

3. The flat-type vibration motor of claim 1 , wherein the rotor further includes a bearing interposed between the holder and the shaft to rotatably support the shaft.

4. The flat-type vibration motor of claim 1 , further comprising:

a bracket including the shaft fixed to a central portion thereof and a second substrate and a magnet that are attached to an upper surface thereof;

a case covering an upper portion of the bracket and providing an inner space; and

a brush having one end fixed to a second substrate and the other end electrically connected to the rotor.

5. The flat-type vibration motor of claim 1 , wherein the holder is extended toward one end portion of the first substrate to thereby be coupled to the first substrate while enclosing a side surface of the first substrate.

6. The flat-type vibration motor of claim 1 , wherein the winding coil is attached to the surface of the first substrate.

7. A flat-type vibration motor comprising:

a winding coil;

a first substrate including a weight body coupled thereto and a circuit pattern formed on a surface thereof and electrically connected to the winding coil; and

a holder coupled to the first substrate,

wherein the circuit pattern is disposed between the holder and the first substrate.