Driving mechanism

1. A driving mechanism for supporting an optical member, comprising:

a fixed module;

a movable module;

a driving module, disposed between the fixed module and the movable module, and the driving module can drive the movable module to rotate around a first rotation axis relative to the fixed module; and

an elastic member, connected to the fixed module and the movable module and having a plate structure, comprising:

a first connecting portion, connected to the movable module;

a second connecting portion, connected to the fixed module;

a first string portion, disposed on the first rotation axis and connected to the first connecting portion, wherein the longitudinal axis of the first string portion is parallel to the first rotation axis; and

a first buffer portion, connected to the first string portion, wherein the first buffer portion has a wave-shaped structure,

wherein the first connection portion directly connects to the movable portion and does not contact the fixed portion directly, the second connection portion directly connects to the fixed portion and does not contact the movable portion directly, and the first connecting portion is connected to the second connecting portion via the first string portion.

2. The driving mechanism as claimed in claim 1 , wherein the elastic member further comprises a plurality of first buffer portions, and the first buffer portions are symmetrical relative to the first rotation axis.

3. The driving mechanism as claimed in claim 1 , wherein the first buffer portion is disposed between the first connecting portion and the first string portion.

4. The driving mechanism as claimed in claim 3 , wherein the first buffer portion has a section contacting the first connecting portion, and the longitudinal axis of the section is parallel or perpendicular to the first rotation axis.

5. The driving mechanism as claimed in claim 1 , wherein the first buffer portion is disposed between the second connecting portion and the first string portion.

6. The driving mechanism as claimed in claim 1 , wherein the driving module further comprises a plurality of first buffer portions, and the first string portion is disposed between the first buffer portions.

7. The driving mechanism as claimed in claim 6 , wherein at least one first buffer portion has a section contacting the first connecting portion, and the longitudinal axis of the section is parallel or perpendicular to the first rotation axis.

8. The driving mechanism as claimed in claim 1 , wherein the driving module can drive the movable module to rotate around a second rotation axis relative to the fixed module, and the elastic member further comprises:

a second string portion, disposed on the second rotation axis, wherein the longitudinal axis of the second string portion is parallel to the second rotation axis; and

a second buffer portion, connected to the second string portion, wherein the second buffer portion has a wave-shaped structure, and the first rotation axis is different from the second rotation axis.

9. The driving mechanism as claimed in claim 8 , wherein the elastic member further comprises a third connecting portion, connected to the first string portion and the second string portion.

10. The driving mechanism as claimed in claim 9 , wherein the third connecting portion has a tapered structure connected to the first buffer portion.

11. The driving mechanism as claimed in claim 8 , wherein the elastic member comprises a plurality of second buffer portions, and the second buffer portions are symmetrical relative to the second rotation axis.

12. The driving mechanism as claimed in claim 1 , wherein the first connecting portion has a first surface, the second connecting portion has a second surface, and the first string portion has a third surface, and the third surface connects the first surface to the second surface, wherein the first surface, the second surface and the third surface are not perpendicular to each other.