Button mechanism

1. A button mechanism, comprising:

a housing;

a fixing member, fixed on the housing;

a moving member, movably disposed in the fixing member;

a pressing member, disposed on the moving member; and

a driving module for moving the moving member relative to the fixing member,

wherein when the pressing member pushes the moving member to move from an initial position along a first direction to a first position, the driving module moves the moving member relative to the pressing member from the first position along the first direction to a second position, wherein when the moving member is in the second position, the driving module moves the moving member along a second direction to impact the pressing member, and the first direction is opposite to the second position.

2. The button mechanism as claimed in claim 1 , wherein a first distance is formed between the initial position and the first position, and a second distance is formed between the first position and the second position, wherein the first distance and the second distance are proportional.

3. The button mechanism as claimed in claim 1 , wherein the driving module comprises a motor.

4. The button mechanism as claimed in claim 3 , wherein the motor is an electromagnetic motor, comprising a coil and a magnetic member.

5. The button mechanism as claimed in claim 4 , wherein the coil is disposed on the moving member, and the magnetic member is disposed on the fixing member.

6. The button mechanism as claimed in claim 4 , wherein the coil is disposed on the fixing member, and the magnetic member is disposed on the moving member.

7. The button mechanism as claimed in claim 3 , wherein the motor is a piezoelectric motor, comprising a piezoelectric member and a pillar, wherein the pillar connects to the piezoelectric member, and the moving member is movably connected to the pillar.

8. The button mechanism as claimed in claim 1 , wherein the driving module comprises a first elastic member, connecting the fixing member with the moving member.

9. The button mechanism as claimed in claim 1 , wherein the driving module comprises a position detector for detecting the position of the moving member, electrically connected to the driving module.

10. The button mechanism as claimed in claim 9 , wherein the position detector comprises a hall sensor, a magnetoresistance effect sensor, a giant magnetoresistance effect sensor, a tunneling magnetoresistance effect sensor, an optical encoder, or an infrared sensor.

11. The button mechanism as claimed in claim 1 , wherein when the moving member is in the initial position, the moving member contacts the pressing member.

12. The button mechanism as claimed in claim 11 , wherein when the moving member is in the initial position, the driving module provides a preload along the second direction on the moving member.

13. The button mechanism as claimed in claim 1 , wherein the button mechanism further comprises an elastomer, connecting the housing with the pressing member.

14. The button mechanism as claimed in claim 1 , wherein the pressing member is connected to the housing and comprises a flexible material.

15. The button mechanism as claimed in claim 14 , wherein the pressing member and the housing are integrally formed in one piece.

16. The button mechanism as claimed in claim 1 , wherein when the moving member is in the initial position, the pressing member is aligned with a surface of the housing.