Optical element driving mechanism

1 . An optical element driving mechanism, comprising:

a movable part connecting an optical element;

a fixed part, wherein the movable part moves relative to the fixed part;

a driving assembly, driving the movable part to move relative to the fixed part; and

a pressure assembly, used to exert a first pre-pressure onto the movable part, wherein the pressure assembly comprises:

a corresponding part of the movable part, corresponding to the movable part;

a corresponding part of the fixed part, corresponding to the fixed part; and

a control assembly, causing the movable part to move relative to the fixed part within a control range,

wherein in a direction of a thickness of the pressure assembly, when the movable part moves within the control range, a distance between the corresponding part of the movable part and the corresponding part of the fixed part does not change.

2 . The optical element driving mechanism as claimed in claim 1 , wherein the pressure assembly has a plate structure, and the pressure assembly further comprise:

an elastic part, wherein the corresponding part of the movable part is movably connected to the corresponding part of the fixed part via the elastic part.

3 . The optical element driving mechanism as claimed in claim 1 , wherein the corresponding part of the movable part comprises:

a first surface, which is a surface of the corresponding part of the movable part facing the movable part; and

a second surface, which is a surface of the corresponding part of the movable part facing the fixed part;

when viewed along the direction of the thickness of the pressure assembly, the first surface and the second surface at least partially overlap.

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

the movable part moves within a limit range relative to the fixed part; and

the limit range includes a first range, and the driving assembly drives the movable part to move relative to the fixed part within the first range.

5 . The optical element driving mechanism as claimed in claim 4 , wherein a central value of the limit range is different from a central value of the first range.

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

the first range includes the control range; and

when the movable part is located within the control range, the pressure assembly does not exert the first pre-pressure onto the movable part, and the pressure assembly does not contact the movable part.

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

the central value of the control range is different from the central value of the limit range;

the limit range further includes a middle range, which is a section in the middle of seven sections into which the limit range is equally divided; and

the central value of the control range and the central value of the first range are not located within the middle range.

8 . The optical element driving mechanism as claimed in claim 4 , wherein the driving assembly comprises a magnetic element and a coil, and

the magnetic element and the coil have approximately the same size, the driving assembly drives the movable part to move relative to the fixed part in a first range.

9 . The optical element driving mechanism as claimed in claim 8 , wherein when the movable part is located at the bottom end of the first range,

the movable part is in contact with the pressure assembly, the movable part directly contacts the first surface;

the corresponding part of the movable part is on the same plane as the corresponding part of the fixed part; and

the corresponding part of the movable part does not contact the fixed part.

10 . The optical element driving mechanism as claimed in claim 3 , wherein the driving assembly comprises a magnetic element and a coil, and

the size of the magnetic element is larger than the coil, the driving assembly drives the movable part to move relative to the fixed part in a first range.

11 . The optical element driving mechanism as claimed in claim 10 , wherein when the movable part is located at the bottom end of the first range, and

the movable part is in contact with the pressure assembly, the movable part directly contacts the first surface.

12 . The optical element driving mechanism as claimed in claim 11 , wherein when the movable part is located at the bottom end of the first range,

when viewed along a direction perpendicular to the direction of the thickness of the pressure assembly, the corresponding part of the fixed part at least partially overlaps the movable part; and

the corresponding part of the movable part directly contacts the fixed part, and the second surface directly contacts the fixed part.

13 . The optical element driving mechanism as claimed in claim 11 , wherein when the movable part is located at the bottom end of the first range,

when viewed along a direction perpendicular to the direction of the thickness of the pressure assembly, the corresponding part of the fixed part at least partially overlaps the movable part; and

the corresponding part of the movable part does not contact the fixed part.

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

the movable part corresponds to an external assembly, and the external assembly exerts a second pre-pressure onto the movable part, the second pre-pressure puts the movable part to the bottom end of a first range.

15 . The optical element driving mechanism as claimed in claim 14 , wherein the first pre-pressure and the second pre-pressure are in different directions.

16 . The optical element driving mechanism as claimed in claim 14 , wherein when the movable part is located at the bottom end of the first range, the movable part is in contact with the pressure assembly.

17 . The optical element driving mechanism as claimed in claim 14 , wherein when the movable part is located at the bottom end of the first range,

the corresponding part of the fixed part at least partially overlaps the movable part when viewed along a direction perpendicular to the direction of the thickness of the pressure assembly; and

the corresponding part of the movable part does not contact the fixed part.

18 . The optical element driving mechanism as claimed in claim 14 , wherein when the movable part is located at the bottom end of the first range,

the corresponding part of the fixed part at least partially overlaps the movable part when viewed along a direction perpendicular to the direction of the thickness of the pressure assembly; and

the corresponding part of the movable part directly contacts the fixed part.