Vibration device and method of fabricating the same

1. A vibration device comprising:

a case;

a vibrator disposed inside the case, the vibrator comprising a magnet, a yoke, and a weight;

a coil supported by the case; and

a spring allowing the vibrator to be elastically supported by the case,

wherein the spring comprises a first coupling portion coupled to the vibrator, a second coupling portion coupled to the case, and a connecting portion connecting the first coupling portion to the second coupling portion, and

wherein the second coupling portion is disposed on a concentric circle with respect to a center of the first coupling portion, and a region in which the second coupling portion is disposed on the concentric circle ranges from 40% or more to less than 100% of a total region of the concentric circle.

2. The vibration device according to claim 1 , the second coupling portion is provided as wherein two to six second coupling portions.

3. The vibration device according to claim 1 , wherein the second coupling portion comprises a guide hole for fixing the second couple portion to the case.

4. The vibration device according to claim 1 , wherein the connecting portion surroundingly extends from the first coupling portion, and an extending angle θ of the connecting portion surroundingly extending from the first coupling portion ranges from 150 to 220 degrees.

5. The vibration device according to claim 1 , wherein the magnet is coupled to an inner surface of the yoke, and the weight is coupled to an outer surface of the yoke.

6. The vibration device according to claim 1 , wherein the first coupling portion is fixed to a top surface of the yoke.

7. The vibration device according to claim 1 , further comprising a circuit substrate disposed inside the case to provide a power to the coil.

8. The vibration device according to claim 1 , further comprising an impact-energy absorbing member facing the magnet disposed inside the case.

9. The vibration device according to claim 1 , further comprising a ferrofluid disposed on a top surface of the vibrator connected to the spring.

10. A vibration device comprising:

a case;

a vibrator comprising a yoke disposed inside the case, a magnet coupled to an inner surface of the yoke and spaced a first distance from the inner surface of the yoke, and a weight coupled to an outer surface of the yoke;

a coil correspondingly disposed in a space between the yoke and the magnet and supported by the case, the coil having a width less than the first distance; and

a spring allowing the vibrator to be elastically supported by the case,

wherein the spring comprises a first coupling portion coupled to the vibrator, a plurality of second coupling portions coupled to the case and comprising a guide hole, and a plurality of connecting portions connecting the first coupling portion to the plurality of second coupling portions.

11. The vibration device according to claim 10 , wherein the second coupling portions are disposed on a concentric circle with respect to a center of the first coupling portion, wherein a region in which the second coupling portion are disposed on the concentric circle ranges from 40% or more to less than 100% of a total region of the concentric circle.

12. The vibration device according to claim 10 , wherein the connecting portions respectively surroundingly extend from the first coupling portion, and an extending angle θ of each of the connecting portions surroundingly extending from the first coupling portion ranges from 150 to 220 degrees.

13. The vibration device according to claim 10 , wherein a lower portion of the outer surface of the yoke protrudes in a direction in which the weight is disposed, and a portion of the yoke is disposed on the same vertical surface as that of the weight.

14. The vibration device according to claim 10 , further comprising a circuit substrate for providing a power to the coil and an impact-energy absorbing member disposed inside the case.

15. The vibration device according to claim 14 , wherein a thickness of the impact-energy absorbing member is greater than that of the circuit substrate.