Method for controlling optical element driving mechanism

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

driving a movable portion moving relative to a fixed portion by a driving assembly, wherein the driving assembly comprises a first driving portion disposed on one side of the fixed portion and the movable portion, the first driving portion comprises a first magnetic permeable element, a first coil, and a first magnetic element, wherein the first coil surrounds the first magnetic permeable element, the first magnetic element is disposed between two extending portions of the first magnetic permeable element;

outputting, by a driver integrated circuit (IC) electrically connected to the driving assembly, a first control signal to the first driving portion based on a sensing signal, wherein the first control signal is periodic and comprises a first front signal, a first middle signal, and a first rear signal in a period, at least one of trends or durations of the first front signal, the first middle signal, and the first rear signal are different, and average intensities of the first front signal and the first rear signal are different;

outputting a second control signal to a second driving portion of the driving assembly by the driver IC, the second control signal is periodic and comprises a second front signal, a second middle signal, and a second rear signal in a period, wherein a total duration of the first front signal and the first middle signal is different from a total duration of the second front signal and the second middle signal; and

limiting the movable portion to move relative to the fixed portion in a limited range by a stopping protrusion extending from a surface of the fixed portion, and the surface faces the movable portion;

wherein the movable portion is used for connecting an optical element, and the movable portion is movable relative to the fixed portion.

2 . The method as claimed in claim 1 , further comprising controlling the movable portion to move relative to the fixed portion in a controlled range by the driver IC, wherein the control range is smaller than the limited range.

3 . The method as claimed in claim 2 , further comprising:

sensing a movement of the movable portion relative to the fixed portion and outputting a sensing signal by a sensing assembly electrically connected to the driving assembly, wherein the sensing assembly comprises a sensing element disposed on the fixed portion, a second reference element disposed on the movable portion, and a balance element disposed on the movable portion, wherein the sensing element overlaps the second reference element in a first direction, and the second reference element and the balance element are disposed on opposite sides of the movable portion along the first direction.

4 . The method as claimed in claim 3 , further comprising:

recording a movement correlation of the movable portion relative to the fixed portion and the first control signal as a first predetermined information; and

measuring the optical element driving mechanism to get the first predetermined information.

5 . The method as claimed in claim 4 , further comprising:

recording the movement correlation of the movable portion relative to the fixed portion and the sensing signal as a first original information; and

performing a first calibration process to the first original information to get the first predetermined information.

6 . The method as claimed in claim 5 , wherein:

the first calibration process comprises inputting the first original information into a polynomial to get the first predetermined information.

7 . The method as claimed in claim 6 , further comprising:

providing a central process unit electrically connected to the driver IC;

outputting the sensing signal from the sensing assembly to the central process unit; and

analyzing and recording the sensing signal by the central process unit.

8 . The method as claimed in claim 7 , further comprising:

emitting or receiving light; and

controlling the time of emitting or receiving light by the central process unit based on the sensing signal and the first predetermined information.

9 . The method as claimed in claim 8 , further comprising:

driving the movable portion relative to the fixed portion in a first dimension by the driving assembly.

10 . The method as claimed in claim 9 , wherein movement of the first driving portion applying a first driving force to the movable portion has a different direction to movement of the second driving portion applying a first driving force to the movable portion.

11 . The method as claimed in claim 10 , wherein:

at least one of trends or durations of the second front signal, the second middle signal, and the second rear signal are different;

average intensity of the second front signal is greater than the average intensity of the first rear signal.

12 . The method as claimed in claim 11 , wherein:

the average intensity of the second front signal is greater than the average intensity of the first front signal; and

when the first control signal is inputted to the first driving portion, the second control signal is inputted to the second driving portion at a same time.

13 . The method as claimed in claim 12 , wherein:

the average intensity of the first front signal is greater than the average intensity of the first rear signal; and

when the first rear signal is inputted to the first driving portion, the second front signal is inputted to the second driving portion at a same time.

14 . The method as claimed in claim 13 , further comprising:

recording the movement correlation of the movable portion relative to the fixed portion and the sensing signal as a third predetermined information;

measuring the optical element driving mechanism to get the third predetermined information; and

recording the third predetermined information in the driver IC.

15 . The method as claimed in claim 14 , wherein:

the third predetermined information comprises a first mode information and a second mode information, and the movable portion moves relative to the fixed portion in a first frequency when measuring the first mode information; and

the movable portion moves relative to the fixed portion in a second frequency when measuring the second mode information.

16 . The method as claimed in claim 15 , wherein the first frequency and the second frequency are different.

17 . The method as claimed in claim 16 , further comprising:

outputting the first control signal by the driver IC based on the third predetermined information and the sensing signal; and

outputting the second control signal by the driver IC based on the third predetermined information and the sensing signal.

18 . The method as claimed in claim 17 , wherein:

the total duration of the first front signal and the first middle signal is greater than the total duration of the second front signal and the second middle signal; and

the first driving portion and the second driving portion are electrically isolated with each other.