Vibration motors and electronic devices utilizing the same

1. A vibration motor comprising:

a first case;

a second case combined with the first case;

a magnet disposed between the first case and the second case;

a rotor disposed between the first case and the second case, wherein the magnet is located between the rotor and the first case;

a shaft passing through the magnet, the rotor, and the second case to be rotatably disposed on the first case;

a weight connected to the shaft and located outside the second case, wherein the weight rotates along with the shaft to generate vibration.

2. The vibration motor as claimed in claim 1 , wherein the second case comprises a first portion, facing the first case, and a second portion located between the first portion and the first case, and the weight partially covers the first and second portions.

3. The vibration motor as claimed in claim 1 , wherein the rotor comprises a first coil, a second coil, a first axis, and a second axis perpendicular to the first axis, the first and second coils are symmetric with respect to the first axis, the first coil is symmetric with respect to the second axis, and the second coil is symmetric with respect to the second axis.

4. The vibration motor as claimed in claim 1 , further comprising a first circuit disposed on the first case, a second circuit disposed on the rotor, and a brush electrically connecting the first and second circuits.

5. The vibration motor as claimed in claim 4 , wherein the rotor comprises a commutator electrically connected to the brush so that the brushing is electrically connected to the second circuit via the commutator.

6. An electronic device comprising:

a housing; and

a vibration motor disposed in the housing to abut the housing;

wherein the vibration motor comprises:

a first case disposed in the housing;

a second case combined with the first case;

a magnet disposed between the first case and the second case;

a rotor disposed between the first case and the second case, wherein the magnet is located between the rotor and the first case;

a shaft passing through the magnet, the rotor, and the second case to be rotatably disposed on the first case; and

a weight connected to the shaft and located outside the second case, wherein the weight rotates along with the shaft, and generates vibration transmitted to the housing.

7. The electronic device as claimed in claim 6 , wherein the second case comprises a first portion, facing the first case, and a second portion located between the first portion and the first case, and the weight is located outside the second case to partially cover the first and second portions.

8. The electronic device as claimed in claim 6 , wherein the first case abuts the housing so that the vibration of the weight is transmitted to the housing via the shaft and the first case.

9. The electronic device as claimed in claim 6 , wherein the rotor comprises a first coil, a second coil, a first axis, and a second axis perpendicular to the first axis, the first and second coils are symmetric with respect to the first axis, the first coil is symmetric with respect to the second axis, and the second coil is symmetric with respect to the second axis.

10. The electronic device as claimed in claim 6 , wherein the vibration motor further comprises a first circuit disposed on the first case, a second circuit disposed on the rotor, and a brush electrically connecting the first and second circuits; wherein the rotor comprises a commutator electrically connected to the brush so that the brush is electrically connected to the second circuit via the commutator.

11. The electronic device as claimed in claim 6 , wherein the electronic device is a mobile phone.

12. An electronic device comprising:

a housing; and

a vibration motor disposed in the housing to abut the housing;

wherein the vibration motor comprises:

a first case disposed in the housing;

a second case combined with the first case;

a magnet disposed between the first case and the second case;

a rotor disposed between the first case and the second case;

a shaft passing through the magnet, the rotor, and the second case to be rotatably disposed on the first case; and

a weight connected to the shaft and located outside the second case, wherein the weight rotates along with the shaft, and generates vibration transmitted to the housing;

wherein the vibration motor further comprises a first circuit disposed on the first case, and a second circuit disposed on the rotor, and a brush electrically connecting the first and second circuits.

13. The electronic device as claimed in claim 12 , wherein the second case comprises a first portion, facing the first case, and a second portion located between the first portion and the first case, and the weight is located outside the second case to partially cover the first and second portions.

14. The electronic device as claimed in claim 12 , wherein the first case abuts the housing so that the vibration of the weight is transmitted to the housing via the shaft and the first case.

15. The electronic device as claimed in claim 12 , wherein the rotor comprises a first coil, a second coil, a first axis, and a second axis perpendicular to the first axis, the first and second coils are symmetric with respect to the first axis, the first coil is symmetric with respect to the second axis, and the second coil is symmetric with respect to the second axis.

16. The electronic device as claimed in claim 12 , wherein the rotor comprises a commutator electrically connected to the brush so that the brush is electrically connected to the second circuit via the commutator.

17. The electronic device as claimed in claim 12 , wherein the magnet is located between the rotor and the first case.

18. The electronic device as claimed in claim 12 , wherein the electronic device is a mobile phone.