Optical element driving mechanism

1 . An optical element driving mechanism used for driving an optical element, comprising:

a fixed portion;

a movable portion movable relative to the fixed portion and comprising a first top wall, a second top wall protruding from the first top wall, and a third top wall protruding from the first top wall, wherein the optical element is disposed on the first top wall of the movable portion, a first top wall surface of the first top wall faces the optical element, a second top wall surface of the second top wall faces the optical element, and a third top wall surface of the third top wall faces the optical element; and

a driving assembly used for driving the optical element to move relative to the fixed portion in a first dimension, wherein the first dimension is rotation relative to a rotational axis parallel to a first axis,

wherein the driving assembly comprises:

a coil;

a first magnetic element corresponding to the coil; and

a second magnetic element corresponding to the coil, wherein the first top wall is disposed between the first magnetic element and the second magnetic element;

wherein:

the coil, the first magnetic element, and the second magnetic element are arranged in a second axis;

the coil and the optical element are arranged in a third axis; and

the first axis, the second axis, and the third axis are mutually perpendicular.

2 . The optical element driving mechanism as claimed in claim 1 , wherein

an N pole and a S pole of the first magnetic element are arranged in a first pole direction that is parallel to the second axis.

3 . The optical element driving mechanism as claimed in claim 2 , wherein:

the first pole direction is perpendicular to the first axis;

at least a portion of the first magnetic element overlaps rotational axis when viewed in a first pole direction;

the first magnetic element and the second magnetic element are arranged in the first pole direction; and

the rotational axis is between the first magnetic element and the second magnetic element.

4 . The optical element driving mechanism as claimed in claim 3 , wherein:

a winding axis of the coil is perpendicular to the first axis;

the winding axis is perpendicular to the first axis and the second axis;

the winding axis is parallel to the third axis;

the coil surrounds the first magnetic element when viewed along the third axis; and

the coil surrounds the second magnetic element when viewed along the third axis.

5 . The optical element driving mechanism as claimed in claim 4 , wherein:

at least a portion of the coil overlaps the first magnetic element in a direction that the second axis extends; and

at least a portion of the coil overlaps the second magnetic element in a direction that the second axis extends.

6 . The optical element driving mechanism as claimed in claim 5 , wherein the fixed portion comprises:

a bottom surface having a planar structure and facing an external device;

a first surface facing the driving assembly;

a first accommodating portion used for accommodating at least a portion of the movable portion; and

a first disposing portion corresponding to the coil.

7 . The optical element driving mechanism as claimed in claim 6 , wherein:

the first surface is not parallel to the bottom surface;

the first surface is not perpendicular to the bottom surface;

the first accommodating portion is formed on the first surface;

the first disposing portion protrudes from the first surface; and

at least a portion of the coil overlaps the first disposing portion when viewed along the third axis.

8 . The optical element driving mechanism as claimed in claim 7 , wherein the driving assembly further comprises:

a first magnetic permeable element corresponding to the first magnetic element;

a second magnetic permeable element corresponding to the second magnetic element; and

a third magnetic permeable element being plate-shaped.

9 . The optical element driving mechanism as claimed in claim 8 , wherein:

the second magnetic permeable element is plate-shaped;

the third magnetic permeable element is between the first magnetic permeable element and the second magnetic permeable element; and

the first magnetic permeable element is affixed to the second magnetic permeable element through the third magnetic permeable element.

10 . The optical element driving mechanism as claimed in claim 9 , wherein:

the first magnetic permeable element, the second magnetic permeable element, and the third magnetic permeable element are integrally formed as one piece;

the third magnetic permeable element is in the first accommodating portion; and

the third magnetic permeable element has a third magnetic permeable element surface facing the movable portion.

11 . The optical element driving mechanism as claimed in claim 10 , wherein:

at least a portion of a first segment of the coil does not overlap the third magnetic permeable element when viewed in a direction that the third axis extends;

the first segment extends in a direction that is not parallel to the first axis;

a shortest distance between the third magnetic permeable element surface and the coil is different from a shortest distance between the first magnetic permeable element and the coil; and

at least a portion of the first magnetic permeable element protrudes from the coil in the direction that the third axis extends.

12 . The optical element driving mechanism as claimed in claim 11 , further comprising a support assembly;

wherein:

the movable portion is movable relative to the fixed portion through the support assembly;

the support assembly is movable relative to the movable portion or the fixed portion;

the fixed portion further comprises a first supporting portion corresponding to the support assembly;

at least a portion of the first magnetic permeable element overlaps the first supporting portion in the direction that the second axis extends; and

the coil surrounds the first supporting portion when viewed along the third axis.

13 . The optical element driving mechanism as claimed in claim 12 , wherein:

the first supporting portion protrudes from the first surface;

the first supporting portion is adjacent to the first disposing portion;

a maximum length of the first supporting portion is greater than a maximum length of the first disposing portion in the direction that the third axis extends;

a first supporting portion surface of the first supporting portion is not parallel to a first disposing portion surface of the first disposing portion; and

the first supporting portion surface of the first supporting portion is not perpendicular to the first disposing portion surface of the first disposing portion.

14 . The optical element driving mechanism as claimed in claim 13 , wherein:

at least a portion of the coil overlaps the support assembly in the direction that the second axis extends; and

a shortest distance between the third magnetic permeable element surface and the coil is greater than a shortest distance between the first magnetic permeable element and the coil.

15 . The optical element driving mechanism as claimed in claim 14 , wherein the movable portion further comprises:

a first recess, wherein the first magnetic element is disposed in the first recess;

a second recess, wherein the second magnetic element is disposed in the second recess;

and

a first exposing portion formed on the first top wall.

16 . The optical element driving mechanism as claimed in claim 15 , wherein:

the first top wall surface and the second top wall surface face different directions;

the third top wall surface and the second top wall surface face opposite directions;

at least a portion of the movable portion overlaps the optical element in the direction that the first axis extends; and

the movable portion does not overlap the optical element in the direction that the second axis extends.

17 . The optical element driving mechanism as claimed in claim 16 , wherein:

the first exposing portion has an opening structure; and

at least a portion of the first magnetic element is exposed from the first exposing portion.

18 . The optical element driving mechanism as claimed in claim 17 , wherein the movable portion further comprises a first adhesive element, and the optical element is affixed on the movable portion through the first adhesive element;

the first adhesive element is in direct contact with the first top wall;

the first adhesive element is in direct contact with the first magnetic element; and

the first adhesive element is in direct contact with the optical element.

19 . The optical element driving mechanism as claimed in claim 18 , wherein:

at least a portion of the first adhesive element is disposed on the first exposing portion; and

the first top wall surface is perpendicular to the second top wall surface.

20 . The optical element driving mechanism as claimed in claim 8 , wherein:

at least a portion of the first magnetic permeable element overlaps the first magnetic element in the direction that the second axis extends;

at least a portion of the first magnetic permeable element overlaps the coil in the direction that the second axis extends;

the first magnetic permeable element is plate-shaped; and

the first magnetic permeable element comprises a protruding portion extending in the direction that the first axis extends.

21 . An optical element driving mechanism used for driving an optical element, comprising:

a fixed portion;

a movable portion movable relative to the fixed portion and comprising a first top wall, a second top wall protruding from the first top wall, and a third top wall protruding from the first top wall, wherein the optical element is disposed on the first top wall of the movable portion, a first top wall surface of the first top wall faces the optical element, a second top wall surface of the second top wall faces the optical element, and a third top wall surface of the third top wall faces the optical element; and

a driving assembly used for driving the optical element to move relative to the fixed portion in a first dimension, wherein the first dimension is rotation relative to a rotational axis parallel to a first axis,

wherein the driving assembly comprises:

a coil, wherein a winding axis of the coil is perpendicular to the first axis;

a first magnetic element corresponding to the coil; and

a second magnetic element corresponding to the coil, wherein the first top wall is disposed between the first magnetic element and the second magnetic element;

wherein:

the coil does not overlap the first magnetic element and the second magnetic element when viewed along the winding axis.

22 . The optical element driving mechanism as claimed in claim 1 , wherein the movable portion further comprises a bottom wall, and the first top wall and the bottom wall are disposed on opposite sides of the first magnetic element,

wherein the first top wall comprises:

a first extending portion;

a second extending portion connected to the first extending portion; and

a third extending portion connected to the second extending portion,

wherein the first extending portion, the second extending portion, and the third extending portion cover a top surface of the first magnetic element, and

wherein the second extending portion extends in a direction different from a direction that the first extending portion extends, and different from a direction that the third extending portion extends.