Optical element driving mechanism

1. An optical element driving mechanism, comprising:

a movable portion for connecting to an optical element, wherein the optical element has a main axis;

a fixed portion comprising a base, wherein the movable portion is movably connected to the fixed portion; and

a driving assembly disposed on the movable portion or the fixed portion for driving the movable portion moving relative to the fixed portion,

wherein the driving assembly comprises:

a first magnetic element disposed on the base;

a second magnetic element disposed on the base; and

a third magnetic element disposed on and fixed on the movable portion, and wherein the entire third magnetic element is completely disposed between the first magnetic element and the second magnetic element in a direction perpendicular to the main axis;

wherein types the first magnetic element and the second magnetic element are one of coil or magnet, and a type of the third magnetic element is another one of coil or magnet, and the types of the first magnetic element and the second magnetic element are different from the type of the third magnetic element.

2. The optical element driving mechanism as claimed in claim 1 , wherein the driving assembly further comprises:

a fourth magnetic element;

a fifth magnetic element; and

a sixth magnetic element,

the sixth magnetic element is disposed between the fourth magnetic element and the fifth magnetic element, a length of the first magnetic element is different than a length of the fourth magnetic element, and a length of the second magnetic element is different than a length of the fifth magnetic element.

3. The optical element driving mechanism as claimed in claim 2 , wherein the first magnetic element comprises a long side and a short side, the second magnetic element comprises a long side and a short side, and a distance between the short side of the first magnetic element and the short side of the second magnetic element is less than a distance between the short side of the first magnetic element and the long side of the second magnetic element in a direction that is perpendicular to the main axis.

4. The optical element driving mechanism as claimed in claim 1 , wherein the first magnetic element has a tropical shape, and the second magnetic element has a trapezoid shape.

5. The optical element driving mechanism as claimed in claim 1 , wherein the base comprises a first accommodating element and a second accommodating element, the first magnetic element is disposed in the first accommodating element, and the second magnetic element is disposed in the second accommodating element, wherein the first accommodating element has a first opening, the second accommodating element has a second opening, and the first opening and the second opening open in opposite directions.

6. The optical element driving mechanism as claimed in claim 5 , wherein a height of the first accommodating element is different than a height of the second accommodating element along the main axis.

7. The optical element driving mechanism as claimed in claim 1 , wherein a height of the first magnetic element is different than a height of the second magnetic element along the main axis.

8. The optical element driving mechanism as claimed in claim 1 , wherein a length of the first magnetic element is different than a length of the second magnetic element in a first direction that is perpendicular to the main axis.

9. The optical element driving mechanism as claimed in claim 8 , wherein a width of the first magnetic element is different than a width of the second magnetic element in a second direction that is perpendicular to the main axis, and the first direction is perpendicular to the second direction.

10. The optical element driving mechanism as claimed in claim 1 , wherein the driving assembly comprises two first magnetic elements, two second magnetic elements, and two third magnetic elements, the first magnetic elements are symmetrical to the main axis, the second magnetic elements are symmetrical to the main axis, and the third magnetic elements are symmetrical to the main axis.

11. The optical element driving mechanism as claimed in claim 1 , further comprising two resilient elements connected to the movable portion and the fixed portion.

12. The optical element driving mechanism as claimed in claim 11 , wherein the resilient elements are symmetrical to the main axis.

13. The optical element driving mechanism as claimed in claim 1 , further comprising a circuit electrically connected to the driving assembly, wherein the movable portion includes two recesses, and the circuit is positioned in the two recesses.

14. The optical element driving mechanism as claimed in claim 1 , wherein the movable portion comprises a holder, and a protruding portion is formed on the holder and extending in the main axis.

15. The optical element driving mechanism as claimed in claim 14 , wherein a column is formed on the holder and extending in a direction perpendicular to the main axis, and the third magnetic element surrounds the column.

16. The optical element driving mechanism as claimed in claim 1 , further comprising a position sensor assembly disposed on the fixed portion or the movable portion.

17. The optical element driving mechanism as claimed in claim 16 , wherein the position sensing assembly comprises a first position sensing element disposed on the movable portion and a second position sensing element disposed on the fixed portion, and the first position sensing element is embedded in the movable portion.

18. The optical element driving mechanism as claimed in claim 16 , further comprising a connecting element, wherein the position sensing assembly comprises a first position sensing element disposed on the connecting element and a second position sensing element disposed on the movable portion.