Driving mechanism

1. A driving mechanism for driving an optical element, comprising:

a housing module;

a hollow holder, movably disposed in the housing module for holding the optical element, wherein the holder has a sidewall portion forming a through hole; and

an electromagnetic driving assembly, including a first magnetic element and a second magnetic element, wherein the first magnetic element is disposed on the holder and exposed to an inner side of the holder via the through hole, and the second magnetic element is connected to the housing module and corresponds to the first magnetic element to move the holder relative to the housing module;

wherein the through hole is exposed to a first outer side of the holder, the second magnetic element faces a second outer side of the holder, and the first outer side is neither perpendicular nor parallel to the second outer side.

2. The driving mechanism as claimed in claim 1 , wherein the housing module has a cover having a top portion and a plurality of side walls, and the top portion forms an opening extending to at least one of the side walls.

3. The driving mechanism as claimed in claim 2 , wherein the opening has a substantially round shape and forms a protruding area extending to the at least one of the side walls.

4. The driving mechanism as claimed in claim 2 , wherein the cover comprises metal material.

5. The driving mechanism as claimed in claim 1 , wherein the housing module has a polygonal structure, and the second magnetic element is disposed at a corner of the polygonal structure.

6. The driving mechanism as claimed in claim 1 , wherein a part of the first magnetic element is tangential to an inner surface of the sidewall portion.

7. The driving mechanism as claimed in claim 1 , wherein the holder comprises a metal frame and a plastic body connected to the metal frame.

8. The driving mechanism as claimed in claim 7 , wherein the first magnetic element is a coil having a winding portion, and the metal frame has a flat sustaining portion to sustain the winding portion.

9. The driving mechanism as claimed in claim 1 , wherein the housing module has a cover and a base connected to each other, and the cover has a metal member and a plastic body which are integrally formed in one piece.

10. The driving mechanism as claimed in claim 9 , wherein the metal member forms a rod portion at a corner of the metal member, and the plastic body has an embedding portion with the rod portion embedded therein.

11. The driving mechanism as claimed in claim 9 , wherein the metal member and the plastic body are integrally formed in one piece by insert molding process.

12. The driving mechanism as claimed in claim 1 , wherein the housing module has a cover and a base connected to each other, the cover comprises metal material, and the base comprises plastic material, wherein the cover and the base are integrally formed in one piece.

13. The driving mechanism as claimed in claim 12 , wherein the cover forms a rod portion at a corner of the cover, and the base forms an embedding portion with the rod portion embedded therein.

14. The driving mechanism as claimed in claim 12 , wherein the cover and the base are integrally formed in one piece by insert molding process.

15. The driving mechanism as claimed in claim 1 , wherein an outer surface of the sidewall portion forms a recess communicated with the through hole, and the first magnetic magnet is disposed in the recess.

16. The driving mechanism as claimed in claim 1 , wherein the housing module has a base having a protruding portion extending along an optical axis of the optical element, and the second magnetic element is fixed to the protruding portion and corresponds to the first magnetic element.

17. The driving mechanism as claimed in claim 1 , wherein the housing module has a quadrilateral base having two protruding portions extending along an optical axis of the optical element, and the protruding portions are respectively located at two diagonal corners of the base, corresponding to the electromagnetic driving assembly.

18. The driving mechanism as claimed in claim 17 , further comprising two springs, wherein the base further has two connecting portions at the other two corners of the base, and the two springs respectively connect the connecting portions with the holder.

19. A driving mechanism for driving an optical element, comprising:

a cover, having a top portion and an extending portion, wherein the top portion forms an opening, and the extending portion extends from an inner edge of the opening along an optical axis of the optical element;

a hollow holder, movably disposed in the cover for holding the optical element, wherein the holder has a sidewall portion forming a through hole, and the extending portion is exposed to an inner side of the holder via the through hole; and

an electromagnetic driving assembly, including a first magnetic element and a second magnetic element, wherein the first magnetic element is disposed on the holder, and the second magnetic element is connected to the cover and corresponds to the first magnetic element to move the holder relative to the cover;

wherein the through hole is exposed to a first outer side of the holder, the second magnetic element faces a second outer side of the holder, and the first outer side is neither perpendicular nor parallel to the second outer side.

20. The driving mechanism as claimed in claim 19 , wherein the holder further has a top surface and a restricting groove formed on the top surface, the restricting groove is communicated with the through hole, and the extending portion is extended into the restricting groove.