Vibration motor

1. A vibration motor, comprising:

a shell providing an accommodating space;

a vibrating system accommodated in the accommodating space;

a pair of elastic connectors for suspending the vibrating system in the accommodating space; and

at least one block member fixed to the shell;

wherein the vibrating system comprises at least one mass member with a limiting groove, the limiting groove is formed at a surface of the at least one mass member along a direction perpendicular to a vibrating direction of the vibrating system;

wherein the at least one block member is partly received in the limiting groove, and a distance between the at least one block member and the at least one mass member is not greater than a maximum vibrating amplitude of the vibrating system, the at least one block member partially stays inside the limiting groove during a relative motion between the block member and the mass member;

wherein the shell comprises a frame, a top plate and a bottom plate, each of the elastic connecters is connected to the frame and the mass member, the vibrating system comprises a first vibrating unit adjacent to the top plate, and a second vibrating unit adjacent to the bottom plate, the first vibrating unit comprises a first mass member and a magnet received and fixed to the first mass member, and the second vibrating unit comprises a second mass member and a coil assembly arranged in the second mass member and under the magnet, and with the coil interacting with the magnet, the first vibrating unit and the second vibrating unit vibrates in a direction opposite to each other.

2. The vibration motor as described in claim 1 , wherein the limiting groove is a through hole penetrating through the at least one mass member from a surface thereof.

3. The vibration motor as described in claim 1 , wherein the limiting groove is a blind hole formed at a surface of the at least one mass member.

4. The vibration motor as described in claim 1 , wherein at least one block member comprises a block body received in the limiting groove, and two fixing parts extending from two opposite ends of the block body and fixed to the shell.

5. The vibration motor as described in claim 4 , the two fixing parts of the at least one block member are fixed to the top plate or the bottom plate.

6. The vibration motor as described in claim 5 , wherein the first mass member comprises a pair of first limiting grooves, and the at least one block member comprises a pair of first block members corresponding to the first limiting groove respectively; the block body of the first block member is received in a corresponding one of the first limiting grooves, and the fixing parts of the first block member are fixed to the top plate.

7. The vibration motor as described in claim 6 , wherein the second mass member comprises a pair of second limiting grooves, and the at least one block member further comprises a pair of second block members corresponding to the second limiting groove respectively; the block body of the second block member is received in a corresponding one of the second limiting grooves, and the fixing parts of the second block member are fixed to the bottom plate.

8. The vibration motor as described in claim 5 , wherein the first mass member comprises a single first limiting groove, and the at least one block member comprises a first block member; the block body of the first block member is received in the first limiting groove, and the fixing parts of the first block member are fixed to the top plate.

9. The vibration motor as described in claim 8 , wherein the second mass member comprises a single second limiting groove, and the at least one block member further comprises a second block member; the block body of the second block member is received in the second limiting groove, and the fixing parts of the second block member are fixed to the bottom plate.

10. The vibration motor as described in claim 9 , wherein the first block member and the second block member are arranged at a same side of the magnet.

11. The vibration motor as described in claim 9 , wherein the first block member and the second block member are arranged at two different sides of the magnet.

12. The vibration motor as described in claim 1 , wherein each one of the elastic connectors comprises a first fixing arm fixed to the frame, an elastic arm bending and extending from the fixing arm, and a second fixing arm extending from the elastic arm and fixed to the mass member.

13. The vibration motor as described in claim 1 , wherein the first mass member comprises a first main body and a pair of first connecting portions diagonally formed at two opposite ends of the first main body, the first connecting portions extending from the first main body to the second mass member, with a magnet receiving hole formed in a central region of the first main body and a pair of first limiting grooves formed on the first main body and in two opposite sides of the magnet receiving hole.

14. The vibration motor as described in claim 13 , wherein the second mass member comprises a second main body and a pair of second connecting portions diagonally formed at two opposite ends of the second main body, the second connecting portions extending from the second main body to the first mass member, with a coil receiving recess formed in a central region of the second main body and a pair of second limiting grooves formed on the second main body and in two opposite sides of the second receiving hole, and the first connecting portions are staggered with the second connecting portions.

15. The vibration motor as described in claim 14 , wherein a first notch running through the first mass member is formed to receive the second connecting portions, and a second notch running through the second mass member is formed to receive the first connecting portions.