Optical element driving mechanism
An optical element driving mechanism used for driving a first optical element is provided. The optical element driving mechanism includes a fixed portion and a first driving assembly. The first driving assembly is used for driving the first optical element to move relative to the fixed portion in a first dimension.
1 . An optical element driving mechanism used for driving an optical element, comprising:
a fixed portion;
a first driving assembly used for driving the optical element moving relative to the fixed portion in a first dimension; and
a resilient assembly comprising:
a first resilient portion;
a second resilient portion;
a third resilient portion;
a first fixed end affixed on the optical element;
a second fixed end affixed on the fixed portion; and
an intermediate connecting portion between the first fixed end and the second fixed end, wherein the optical element is movably connected to the fixed portion through the resilient assembly,
wherein:
when viewed in a first direction, the first resilient portion has a plurality of bends, the third resilient portion has a plurality of bends, and the first resilient portion and the third resilient portion are mirror symmetrical with respect to a second axis;
a number of bends of the second resilient portion is less than a number of bends of the first resilient portion;
junctions between the first resilient portion and the second fixed end, between the first resilient portion and the intermediate connecting portion, between the second resilient portion and the intermediate connecting portion, and between the second resilient portion and the first fixed end are arranged along a straight line;
the straight line is parallel to a first axis; and
the first resilient portion and the third resilient portion are arranged along the first axis.
2 . The optical element driving mechanism as claimed in claim 1 , wherein the first driving assembly comprises:
a coil having a winding axis;
a first magnetic element corresponding to the coil; and
a first magnetic permeable element corresponding to the first magnetic element.
3 . The optical element driving mechanism as claimed in claim 2 , wherein:
the first magnetic permeable element comprises a first protruding portion protruding from the first magnetic element and corresponding to the coil;
the first protruding portion comprises a first protruding surface perpendicular to the winding axis; and
an N pole and a S pole of the first magnetic element are arranged in a first pole direction.
4 . The optical element driving mechanism as claimed in claim 3 , wherein the first driving assembly further comprises:
a second magnetic permeable element corresponding to the first magnetic element; and
a second magnetic element corresponding to the coil.
5 . The optical element driving mechanism as claimed in claim 4 , wherein:
a connection between centers of the first magnetic permeable element and the second magnetic permeable element is parallel to the first pole direction;
an N pole and a S pole of the second magnetic element are arranged in a second pole direction;
the first pole direction and the second pole direction are parallel;
centers of the first magnetic element and the second magnetic element are arranged in the first axis;
the first dimension is rotation relative to a first rotational axis;
the first rotational axis and the first axis are parallel; and
the second axis is perpendicular to the first axis.
6 . The optical element driving mechanism as claimed in claim 5 , wherein:
the intermediate connecting portion movably connects to the second fixed end through the first resilient portion;
the first fixed end movably connects to the intermediate connecting portion through the second resilient portion; and
the intermediate connecting portion movably connects to the second fixed end through the third resilient portion.
7 . The optical element driving mechanism as claimed in claim 6 , wherein:
the first resilient portion and the second resilient portion have different elastic coefficients;
a minimum width of the first resilient portion is less than a minimum width of the second resilient portion; and
the first resilient portion and the second resilient portion have an identical thickness.
8 . The optical element driving mechanism as claimed in claim 7 , wherein:
the elastic coefficient of the first resilient portion is less than the elastic coefficient of the second resilient portion;
the second resilient portion does not have any bends; and
the first axis, the second axis, and the first direction are perpendicular to each other.
9 . The optical element driving mechanism as claimed in claim 8 , wherein:
a first surface of the resilient assembly faces the first magnetic element;
the first surface and a second surface of the resilient assembly face opposite directions;
the first protruding surface is between the second surface and the first magnetic element when viewed in a second direction;
the first protruding surface is between a center of the resilient element and a center of the coil in the first direction when viewed in the second direction; and
the first surface faces the coil.
10 . The optical element driving mechanism as claimed in claim 9 , wherein:
when current with a first frequency is input to the coil, the first fixed end rotates relative to the fixed portion in a first rotational range, and the intermediate connecting portion rotates relative to the fixed portion in a second rotational range; and
a maximum value of the first rotational range is different from a maximum value of the second rotational range.
11 . The optical element driving mechanism as claimed in claim 10 , wherein:
when current is input to the coil, a phase difference is between movements of the first fixed end and the intermediate connecting portion; and
the phase difference is greater than 90 degrees.
12 . The optical element driving mechanism as claimed in claim 11 , wherein the fixed portion comprises:
a bottom surface having a planar structure and facing an external device;
a spacing portion between the first magnetic element and the second magnetic element;
a first recess used for accommodating a portion of the first magnetic element;
a second recess used for accommodating the second magnetic element;
a third recess, wherein the first recess is in the third recess;
a fourth recess corresponding to the first resilient portion;
a fifth recess corresponding to the third resilient portion; and
a base surface facing the resilient assembly.
13 . The optical element driving mechanism as claimed in claim 12 , wherein:
the maximum value of the first rotational range is greater than the maximum value of the second rotational range;
a first magnetic element surface of the first magnetic element is at least partially exposed from the first recess;
at least a portion of the first magnetic permeable element is in the first recess; and
the second magnetic permeable element is not in the first recess.
14 . The optical element driving mechanism as claimed in claim 13 , wherein:
the second recess is in the third recess;
the fourth recess is in the third recess;
the fifth recess is in the third recess; and
the spacing portion is in the third recess.
15 . The optical element driving mechanism as claimed in claim 14 , wherein:
a shortest distance between the first magnetic element and the bottom surface is different from a shortest distance between the second magnetic element and the bottom surface; and
a shortest distance between the first magnetic permeable element and the bottom surface is different from a shortest distance between the second magnetic permeable element and the bottom surface.
16 . The optical element driving mechanism as claimed in claim 15 , wherein:
the shortest distance between the first magnetic element and the bottom surface is less than the shortest distance between the second magnetic element and the bottom surface; and
the shortest distance between the first magnetic permeable element and the bottom surface is greater than the shortest distance between the second magnetic permeable element and the bottom surface.
17 . The optical element driving mechanism as claimed in claim 16 , wherein:
the first axis is not parallel to the bottom surface;
the first axis is not perpendicular to the bottom surface;
the base surface is not parallel to the bottom surface; and
the base surface is not perpendicular to the bottom surface.
18 . The optical element driving mechanism as claimed in claim 17 , wherein:
the third recess is formed on the base surface;
the second fixed end is not in mirror symmetrical relative to the first axis when viewed in the first direction;
a distance between a center of the second fixed end and a center of the optical element is greater than 0 when viewed in the first direction;
a shortest distance between the center of the second fixed end and the bottom surface is different from a shortest distance between the center of the optical element and the bottom surface; and
the second fixed portion is U-shaped.