Patent Publication Number: US-2022221685-A1

Title: Optical element driving mechanism

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of U.S. Provisional Application No. 63/135,402, filed 8 Jan. 2021. U.S. Provisional Application No. 63/143,344, filed 29 Jan. 2021, and U.S. Provisional Application No. 63/183,395, filed 3 May 2021, the entirety of which are incorporated by reference herein. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present disclosure relates to an optical element driving mechanism, and more particularly to the optical element driving mechanism of an electrical device. 
     Description of the Related Art 
     As the relevant technologies have developed, many electronic devices (such as computers and tablets) are equipped with the capability to record images and videos. However, when an optical element (such as lens) having a long focal length is installed in an electronic device, the thickness of the electronic device may be increased, impeding the prospects for miniaturization of the electronic device. Therefore, how to design an optical element driving mechanism and an optical device that can help miniaturize the electronic device has become an important issue. 
     BRIEF SUMMARY OF THE INVENTION 
     To solve the problems of the prior art, an optical element driving mechanism is provided, including: a fixed part, a movable part, and a driving assembly. The movable part is movable relative to the fixed part. The driving assembly drives the movable part to move relative to the fixed part. The driving assembly includes a driving magnetic element and a driving coil, and the driving magnetic element corresponds to the driving coil. 
     In one of the embodiments of the present disclosure, the movable part includes an optical element holder, the driving magnetic element includes a first driving magnetic element, and the driving coil includes an optical element holder driving coil. The optical element holder driving coil is disposed on the optical element holder and corresponds to the first driving magnetic element. 
     In one of the embodiments of the present disclosure, the driving assembly further includes a first driving magnetic element conductive sheet. The first driving magnetic element conductive sheet is disposed between the optical element holder driving coil and the optical element holder, and the optical element holder driving coil is fixedly disposed on the first driving magnetic element conductive sheet. 
     In one of the embodiments of the present disclosure, the movable part further includes a photosensitive element holder, and the driving coil further includes a photosensitive element holder first driving coil and a photosensitive element holder second driving coil. The photosensitive element holder first driving coil and the photosensitive element holder second driving coil are disposed on the photosensitive element holder. The photosensitive element holder first driving coil and the photosensitive element holder second driving coil correspond to the first driving magnetic element. 
     In one of the embodiments of the present disclosure, the driving magnetic element further includes a second driving magnetic element. The photosensitive element holder first driving coil and the photosensitive element holder second driving coil correspond to the second driving magnetic element. 
     In one of the embodiments of the present disclosure, the driving coil further includes an optical element holder second driving coil. The optical element holder second driving coil is disposed on the optical element holder and corresponds to the second driving magnetic element. 
     In one of the embodiments of the present disclosure, the first driving magnetic element and the second driving magnetic element are respectively disposed on two opposite sides of the optical element driving mechanism. 
     In one of the embodiments of the present disclosure, a magnetic force emitting surface of the first driving magnetic element is parallel to an optical axis, and a magnetic force emitting surface of the second driving magnetic element is perpendicular to the optical axis. 
     In one of the embodiments of the present disclosure, the optical element driving mechanism further includes a sensing element. The sensing element corresponds to the magnetic force emitting surface of the first driving magnetic element. 
     In one of the embodiments of the present disclosure, the direction of the current of the photosensitive element holder first driving coil and the direction of the current of the photosensitive element holder second driving coil are the same when viewed along the optical axis. 
     In one of the embodiments of the present disclosure, the direction of the current of the photosensitive element holder first driving coil and the direction of the current of the photosensitive element holder second driving coil are different when viewed along the optical axis. 
     In one of the embodiments of the present disclosure, the shortest distance between the first driving magnetic element and the optical element holder is greater than the shortest distance between the second driving magnetic element and the optical element holder. 
     In one of the embodiments of the present disclosure, the driving coil is not disposed between the second driving magnetic element and the optical element holder. 
     In one of the embodiments of the present disclosure, the first driving magnetic element is disposed on a first side of the optical element driving mechanism. The second driving magnetic element is disposed on a second side of the optical element driving mechanism. The first side is opposite to the second side. 
     In one of the embodiments of the present disclosure, the movable part includes an optical element holder guiding element. The optical element holder guiding element is disposed on the first side of the optical element driving mechanism. 
     In one of the embodiments of the present disclosure, the driving magnetic element further includes a third driving magnetic element, and the driving coil further includes a photosensitive element holder third driving coil. The photosensitive element holder third driving coil is disposed on the photosensitive element holder. The photosensitive element holder third driving coil corresponds to the third driving magnetic element. The third driving magnetic element is disposed on a third side of the optical element driving mechanism. 
     In one of the embodiments of the present disclosure, a magnetic force emitting surface of the third driving magnetic element is perpendicular to an optical axis. 
     In one of the embodiments of the present disclosure, the driving coil is not disposed between the third driving magnetic element and the optical element holder. 
     In one of the embodiments of the present disclosure, the shortest distance between the third driving magnetic element and the first driving magnetic element is greater than the shortest distance between the third driving magnetic element and the second driving magnetic element when viewed along an optical axis. 
     In one of the embodiments of the present disclosure, the shortest distance between the first driving magnetic element and the optical element holder is greater than the shortest distance between the third driving magnetic element and the optical element holder. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present invention may be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: 
         FIG. 1  is a schematic view of an electrical device according to some embodiment of the present disclosure; 
         FIG. 2  is a schematic view of an optical element driving mechanism according to some embodiments of the present disclosure, wherein an outer frame is shown as a dashed line; 
         FIG. 3  is an exploded view of the optical element driving mechanism according to some embodiments of the present disclosure; 
         FIG. 4  is a schematic view of the optical element driving mechanism according to some embodiments of the present disclosure, wherein the outer frame is omitted; 
         FIG. 5  is a cross-sectional view of the optical element driving mechanism along line A-A′ of  FIG. 2 , according to some embodiments of the present disclosure; 
         FIG. 6  is a cross-sectional view of the optical element driving mechanism along line B-B′ of  FIG. 2 , according to some embodiments of the present disclosure; 
         FIG. 7  is a cross-sectional view of the optical element driving mechanism along line C-C′ of  FIG. 2 : 
         FIG. 8  is a cross-sectional view of the optical element driving mechanism along line D-D′ of  FIG. 2 ; 
         FIG. 9  is a cross-sectional view of the optical element driving mechanism along line E-E′ of  FIG. 2 , wherein magnetic field lines of a first driving magnetic element and magnetic field lines of a second driving magnetic element are illustrated: 
         FIG. 10  is a cross-sectional view of the optical element driving mechanism along line F-F′ of  FIG. 2 , wherein magnetic field lines of a third driving magnetic element are illustrated; and 
         FIG. 11  is a schematic view of an optical element driving mechanism according to some other embodiments of the present disclosure, wherein the outer frame is shown as a dashed line. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The making and using of optical element driving mechanisms of embodiments of the present disclosure are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable inventive concepts that may be embodied in a wide variety of specific contexts. The specific embodiments discussed are merely illustrative of specific ways to make and use the embodiments and do not limit the scope of the disclosure. 
     It should be understood that, although the terms “first”, “second” etc. may be used herein to describe various elements, layers and/or portions, and these elements, layers, and/or portions should not be limited by these terms. These terms are only used to distinguish one element, layer, or portion. Thus, a first element, layer or portion discussed below could be termed a second element, layer or portion without departing from the teachings of some embodiments of the present disclosure. In addition, for the sake of brevity, terms such as “first” and “second” may not be used in the description to distinguish different elements. As long as it does not depart from the scope defined by the appended claims, the first element and/or the second element described in the appended claims can be interpreted as any element that meets the description in the specification. 
     Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It should be appreciated that each term, which is defined in a commonly used dictionary, should be interpreted as having a meaning conforming to the relative skills and the background or the context of the present disclosure, and should not be interpreted in an idealized or overly formal manner unless defined otherwise. 
     Firstly, please refer to  FIG. 1 ,  FIG. 1  is a schematic view of an electrical device  1  according to some embodiment of the present disclosure. As shown in  FIG. 1 , an optical element driving mechanism  100  of some embodiment of the present disclosure may be mounted in an electrical device  1  for taking photos or videos, wherein the aforementioned electrical device  1  may, for example, be a smartphone or a digital camera, but the present disclosure is not limited to these. It should be noted that the position and the size between the optical element driving mechanism  100  and the electrical device  1  shown in  FIG. 1  are only an example, which is not for limiting the position and the size between the optical element driving mechanism  100  and the electrical device  1 . In fact, according to different needs, the optical element driving mechanism  100  may be mounted at different positions in the electrical device  1   
     Please refer to  FIG. 2 .  FIG. 2  is a schematic view of the optical element driving mechanism  100  according to some embodiments of the present disclosure, wherein the outer frame is shown as a dashed line.  FIG. 3  is an exploded view of the optical element driving mechanism  100  according to some embodiments of the present disclosure. 
     As shown in  FIG. 2  and  FIG. 3 , the optical element driving mechanism  100  may include a fixed part  10 , a movable part  20 , a driving assembly  30 , an elastic assembly  40 , a circuit assembly  50 , and a sensing element  60 . 
     The optical element driving mechanism  100  may have a first side  100   a , a second side  100   b , a third side  100   c , and a fourth side  100   d . According to some embodiments of the present disclosure, the first side  100   a  is opposite to the second side  100   b , and the first side  100   a  and the second side  100   b  are parallel to each other. According to some embodiments of the present disclosure, the third side  100   c  is opposite to the fourth side  100   d , and the third side  100   c  and the fourth side  100   d  are parallel to each other. 
     The movable part  20  may move relative to the fixed part  10 , and the driving assembly  30  may drive the movable part  20  to move relative to the fixed part  10 . The movable part  20  may holds an optical element OE. 
     The fixed part  10  may include an outer frame  11 , a frame  12 , and a base  13 . The outer frame  11  may be disposed on the base  13  to form an internal space, so as to accommodate the elements of the optical element driving mechanism  100 . 
     The movable part  20  may include an optical element holder  21 , an optical element holder guiding element  22 , a photosensitive element holder  23 , and a photosensitive element holder rolling element  24 . 
     The driving assembly  30  may include a driving magnetic element  31 , a driving coil  32 , and a first driving magnetic element conductive sheet  33 . 
     According to some embodiments of the present disclosure, the elastic assembly  40  may be disposed between the driving assembly  30  and the outer frame  11 . The elastic assembly  40  may include an upper elastic element  41  and a lower elastic element  42 . 
     The circuit assembly  50  may include an optical element holder circuit board  51  and a photosensitive element holder circuit board  52 . According to some embodiments of the present disclosure, the optical element holder circuit board  51  may be disposed on the fourth side  100   d  of the optical element driving mechanism  100 . 
     According to some embodiments of the present disclosure, the outer frame  11  may have a magnetic conductive material to enhance and concentrate the magnetic force of the driving magnetic element  31 . According to some embodiments of the present disclosure, the frame  12  may include a frame metal sheet  121 . 
     The optical element holder  21  may include an optical element holder body  211  and an optical element holder stopping element  212 . The optical element holder  21  may fixedly hold the optical element OE. Therefore, the optical element OE will move with the optical element holder  21  when the optical element holder  21  is moving. 
     As shown in the figures, the optical element holder stopping element  212  may extend from the optical element holder body  211  toward the frame  12 . 
     According to some embodiments of the present disclosure, the optical element holder guiding element  22  may be disposed on the first side  100   a  of the optical element driving mechanism  100 . The optical element holder guiding element  22  may guide the optical element holder  21  so that the optical element holder  21  may move in a desired dimension (for example, along an optical axis OA). 
     As shown in the figure, according to some embodiments of the present disclosure, the optical element holder guiding element  22   s  may have a spherical shape to facilitate the stable movement of the optical element holder  21  along the optical axis OA. 
     The photosensitive element holder  23  may fixedly hold a photosensitive element SE. According to some embodiments of the present disclosure, the photosensitive element holder  23  may move along a first axis AX 1  and a second axis AX 2  that are perpendicular to the optical axis OA. According to some embodiments of the present disclosure, the photosensitive element holder  23  may move (rotate) around the optical axis OA. 
     The photosensitive element holder  23  may include a photosensitive element holder metal sheet  231  and a photosensitive element holder rolling element accommodating portion  232 . 
     According to some embodiments of the present disclosure, the driving magnetic element  31  may correspond to the driving coil  32 . The driving magnetic element  31  may include a first driving magnetic element  311 , a second driving magnetic element  312 , and a third driving magnetic element  313 . 
     The driving coil  32  includes an optical element holder driving coil  321 , a photosensitive element holder first driving coil  322 , a photosensitive element holder second driving coil  323 , and a photosensitive element holder third driving coil  324 . 
     According to some embodiments of the present disclosure, the upper elastic element  41  may be disposed above the frame  12 , and the lower elastic element  42  is disposed under the frame metal sheet  121  ( FIG. 5 ). 
     Please refer to  FIG. 4 .  FIG. 4  is a schematic view of the optical element driving mechanism  100  according to some embodiments of the present disclosure, wherein the outer frame is omitted. As shown in  FIG. 4 , according to some embodiments of the present disclosure, the first driving magnetic element  311  and the second driving magnetic element  312  may be respectively disposed on two opposite sides of the optical element driving mechanism  100 . According to some embodiments of the present disclosure, the first driving magnetic element  311  and the second driving magnetic element  312  may be arranged along the first axis AX 1 . 
     According to some embodiments of the present disclosure, the first driving magnetic element  311  may be disposed on the first side  100   a  of the optical element driving mechanism  100 . According to some embodiments of the present disclosure, the second driving magnetic element  312  may be disposed on the second side  100   b  of the optical element driving mechanism  100 . According to some embodiments of the present disclosure, the third driving magnetic element  313  may be disposed on the third side  100   c  of the optical element driving mechanism  100 . According to some embodiments of the present disclosure, the driving magnetic element  31  is not disposed on the fourth side  100   d  of the optical element driving mechanism  100   
     As shown in  FIG. 4 , according to some embodiments of the present disclosure, the optical element holder driving coil  321  may be disposed on the optical element holder  21 , and the optical element holder driving coil  321  may correspond to the first driving magnetic element  311 . In other words, the optical element holder driving coil  321  may be disposed on the first side  100   a  of the optical element driving mechanism  100 , and the optical element holder driving coil  321  may be disposed adjacent to the first driving magnetic element  311 . 
     According to some embodiments of the present disclosure, the first driving magnetic element conductive sheet  33  may be disposed between the optical element holder driving coil  321  and the optical element holder  21 . According to some embodiments of the present disclosure, the optical element holder driving coil  321  may be fixedly disposed on first driving magnetic element conductive sheet  33 . 
     In other words, according to some embodiments of the present disclosure, the first driving magnetic element conductive sheet  33  may correspond to the first magnetic driving element  311 . In this way, the magnetic force of the first driving magnetic element  311  may be concentrated, and a stronger driving force may be used to move the optical element holder  21  along the optical axis OA. 
     Please refer to  FIG. 4 , according to some embodiments of the present disclosure, the driving coil  32  is not disposed between the second driving magnetic element  312  and the optical element holder  21 . According to some embodiments of the present disclosure, the driving coil  32  is not disposed between the third driving magnetic element  313  and the optical element holder  21 . In this way, the volume and weight of the optical element driving mechanism  100  may be reduced, and the effect of miniaturization may be achieved. 
     Please continue to refer to  FIG. 4 , according to some embodiments of the present disclosure, the shortest distance S 1  between the first driving magnetic element  311  and the optical element holder  21  is greater than the shortest distance S 2  between the second driving magnetic element  312  and the optical element holder  21  when viewed along the optical axis OA. It should be noted that, according to some embodiments of the present disclosure, the shortest distance S 1  and the shortest distance S 2  may be parallel to the first axis AX 1 . 
     According to some embodiments of the present disclosure, the shortest distance S 1  between the first driving magnetic element  311  and the optical element holder  21  is greater than the shortest distance S 3  between the third driving magnetic element  313  and the optical element holder  21  when viewed along the optical axis OA. It should be noted that, according to some embodiments of the present disclosure, the shortest distance S 3  may be parallel to the second axis AX 2 . 
     According to the disclosed embodiment, the shortest distance S 4  between the third driving magnetic element  313  and the first driving magnetic element  311  is greater than the shortest distance S 5  between the third driving magnetic element  313  and the second driving magnetic element  312  when viewed along the optical axis OA. 
     It should be noted that, according to some embodiments of the present disclosure, the aforementioned shortest distance S 4  and shortest distance S 5  may be parallel to the first axis AX 1 . 
     That is, as shown in  FIG. 4 , according to some embodiments of the present disclosure, the optical element holder  21  and the optical element OE (not shown in  FIG. 4 ) may be eccentric. Moreover, according to some embodiments of the present disclosure, the driving assembly  30  may be eccentric. 
     According to some embodiments of the present disclosure, the driving assembly center  30 ′ of the driving assembly  30  may not overlap the optical element driving mechanism center  100 ′ of the optical element driving mechanism  100  when viewed along the optical axis OA. 
     According to some embodiments of the present disclosure, an optical element center OE′ of the optical element OE may not overlap the optical element driving mechanism center  100 ′ of the optical element driving mechanism  100  when viewed along the optical axis OA. 
     According to some embodiments of the present disclosure, the optical element center OE′ of the optical element OE may not overlap the driving assembly center  30 ′ of the driving assembly  30  when viewed along the optical axis OA. 
     However, according to some other embodiments of the present disclosure, the optical element center OE′ of the optical element OE may overlap the driving assembly center  30 ′ of the driving assembly  30  when viewed along the optical axis OA (not shown in the figures). 
     Please refer to  FIG. 5  and  FIG. 6 ,  FIG. 5  is a cross-sectional view of the optical element driving mechanism  100  along line A-A′ of  FIG. 2 , according to some embodiments of the present disclosure;  FIG. 6  is a cross-sectional view of the optical element driving mechanism  100  along line B-B′ of  FIG. 2 , according to some embodiments of the present disclosure. 
     As shown in  FIG. 5  and  FIG. 6 , according to some embodiments of the present disclosure, the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  may be disposed on the photosensitive element holder  23 . 
     As shown in  FIG. 5 , according to some embodiments of the present disclosure, the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  may correspond to the first driving magnetic element  311 . 
     According to some embodiments of the present disclosure, the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  of the driving coil  32  may be disposed between the first driving magnetic element  311  of the driving magnetic  31  and the photosensitive element holder  23 . 
     As shown in  FIG. 6 , according to some embodiments of the present disclosure, the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  may correspond to the second magnetic driving element  312 . 
     The photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  of the driving coil  32  may be disposed between the second magnetic driving element  312  of the driving magnetic  31  and the photosensitive element holder  23   
     Please refer to  FIG. 7 ,  FIG. 7  is a cross-sectional view of the optical element driving mechanism  100  along line C-C′ of  FIG. 2 . As shown in  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder third driving coil  324  may be disposed on the photosensitive element holder  23 . 
     According to some embodiments of the present disclosure, the photosensitive element holder third driving coil  324  may correspond to the third driving magnetic element  313 . According to some embodiments of the present disclosure, the photosensitive element holder third driving coil  324  of the driving coil  32  may be disposed between the third driving magnetic element  313  of the driving magnetic element  31  and the photosensitive element holder  23 . 
     Please refer to  FIG. 5 , according to some embodiments of the present disclosure, the photosensitive element holder metal sheet  231  may at least partially overlap the first driving magnetic element  311  of the driving magnetic element  31  when viewed along the optical axis OA. 
     According to some embodiments of the present disclosure, the photosensitive element holder metal sheet  231  may not completely overlap the whole first driving magnetic element  311  of the driving magnetic element  31  when viewed along the optical axis OA. 
     Please refer to  FIG. 6 , according to some embodiments of the present disclosure, the photosensitive element holder metal sheet  231  and the second driving magnetic element  312  of the driving magnetic element  31  may at least partially overlap when viewed along the optical axis OA. 
     According to some embodiments of the present disclosure, the photosensitive element holder metal sheet  231  may not completely overlap the whole second driving magnetic element  312  of the driving magnetic element  31  when viewed along the optical axis OA. 
     Please refer to  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder metal sheet  231  may at least partially overlap the third driving magnetic element  313  of the driving magnetic element  31  when viewed along the optical axis OA. 
     According to some embodiments of the present disclosure, the photosensitive element holder metal sheet  231  may not completely overlap the whole third driving magnetic element  313  of the driving magnetic element  31  when viewed along the optical axis OA. 
     That is, according to some embodiments of the present disclosure, the photosensitive element holder metal sheet  231  may not completely overlap the whole driving magnetic element  31  when viewed along the optical axis OA. 
     The above configuration may make the photosensitive element holder  23  move back to the original position by magnetic force when the driving coil  32  of the driving assembly  30  does not receive current. It should be noted that the original position herein may refer to the natural resting position of the photosensitive element holder  23  when it is not subjected to electromagnetic driving force. 
     Please refer to  FIG. 5 , according to some embodiments of the present disclosure, there may be a non-zero gap between the photosensitive element holder metal sheet  231  and the first driving magnetic element  311  of the driving magnetic element  31 . 
     Please refer to  FIG. 6 , according to some embodiments of the present disclosure, there may be a non-zero gap between the photosensitive element holder metal sheet  231  and the second driving magnetic element  312  of the driving magnetic element  31 . 
     Please refer to  FIG. 7 , according to some embodiments of the present disclosure, there may be a non-zero gap between the photosensitive element holder metal sheet  231  and the third driving magnetic element  313  of the driving magnetic element  31 . 
     In other words, according to some embodiments of the present disclosure, there may be a non-zero gap between the photosensitive element holder metal sheet  231  and the driving magnetic element  31 . 
     Please refer to  FIG. 5 , according to some embodiments of the present disclosure, there may be a non-zero gap between the photosensitive element holder metal sheet  231  and the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  of the driving coil  32 . 
     Please refer to  FIG. 6 , according to some embodiments of the present disclosure, there may be a non-zero gap between the photosensitive element holder metal sheet  231  and the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  of the driving coil  32 . 
     Please refer to  FIG. 7 , according to some embodiments of the present disclosure, there may be a non-zero gap between the photosensitive element holder metal sheet  231  and the photosensitive element holder third driving coil  324  of the driving coil  32 . 
     That is, according to some embodiments of the present disclosure, there may be a non-zero gap between the photosensitive element holder metal sheet  231  and the driving coil  32 . 
     Please refer to  FIG. 5 , according to some embodiments of the present disclosure, the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  of the driving coil  32  may be disposed between the first driving magnetic element  311  of the driving magnetic element  31  and the photosensitive element holder metal sheet  231 . 
     Please refer to  FIG. 6 , according to some embodiments of the present disclosure, the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  of the driving coil  32  may be disposed between the second driving magnetic element  312  of the driving magnetic element  31  and the photosensitive element holder metal sheet  231 . 
     Please refer to  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder third driving coil  324  of the driving coil  32  may be disposed between the third driving magnetic element  313  of the driving magnetic element  31  and the photosensitive element holder metal sheet  231 . 
     In other words, according to some embodiments of the present disclosure, the driving coil  32  may be disposed between the driving magnetic element  31  and the photosensitive element holder metal sheet  231 . 
     Please refer to  FIG. 8 ,  FIG. 8  is a cross-sectional view of the optical element driving mechanism  100  along line D-D′ of  FIG. 2 . As shown in  FIG. 8 , In accordance with some embodiments of the present disclosure, along the optical axis OA, the shortest distance S 6  between the optical element holder stopping element  212  and the frame  12  of the fixed part  10  may be shorter than the shortest distance S 7  between the optical element holder body  211  and the photosensitive element holder  23 . 
     In this way, the range of movement of the optical element holder  21  along the optical axis OA may be restricted, and the optical element holder  21  may be prevented from being in contact with the photosensitive element holder  23 , thereby preventing the optical element holder  21  and the photosensitive element holder  23  from damage. 
     Please refer to  FIG. 5 , according to some embodiments of the present disclosure, the photosensitive element holder circuit board  52  may be disposed between the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  of the driving coil  32  and the photosensitive element holder metal sheet  231 . 
     Please refer to  FIG. 6 , according to some embodiments of the present disclosure, the photosensitive element holder circuit board  52  may be disposed between the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  of the driving coil  32  and the photosensitive element holder metal sheet  231 . 
     Please refer to  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder circuit board  52  may be disposed between the photosensitive element holder third driving coil  324  of the driving coil  32  and the photosensitive element holder metal sheet  231 . 
     In other words, according to some embodiments of the present disclosure, the photosensitive element holder circuit board  52  may be disposed between the driving coil  32  and the photosensitive element holder metal sheet  231 . 
     Please refer to  FIG. 5 ,  FIG. 6  and  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder circuit board  52  may be in contact with the photosensitive element holder metal sheet  231 . 
     Please refer to  FIG. 5 ,  FIG. 6  and  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder rolling element  24  may be disposed between the frame  12  and the photosensitive element holder  23 . 
     In this way, the photosensitive element holder  23  may move relative to the frame  12  of the fixed part  10 . For example, the photosensitive element holder  23  may move relative to the frame  12  of the fixed part  10  along the first axis AX 1  or the second axis AX 2 . For example, the photosensitive element holder  23  may move (rotate) relative to the frame  12  of the fixed part  10  around the optical axis OA. 
     Please refer to  FIG. 5 ,  FIG. 6  and  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder rolling element  24  may be disposed between the frame metal sheet  121  and the photosensitive element holder metal sheet  231 . 
     Please refer to  FIG. 5 ,  FIG. 6  and  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder rolling element  24  may be in contact with the frame metal sheet  121  and the photosensitive element holder metal sheet  231 . In this way, the frame  12  and the photosensitive element holder  23  may be avoided from being damaged, and it may be helpful for the movement of the photosensitive element holder rolling element  24 . 
     Please refer to  FIG. 5 ,  FIG. 6  and  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder rolling element accommodating portion  232  may surround the photosensitive element holder rolling element  24 . In this way, the range of movement of the photosensitive element holder rolling element  24  may be limited. 
     Please refer to  FIG. 5 ,  FIG. 6  and  FIG. 7 , according to some embodiments of the present disclosure, the photosensitive element holder metal sheet  231  may at least partially overlap the photosensitive element holder rolling element accommodating portion  232  when viewed along a direction that is perpendicular to the optical axis OA (for example, the first axis AX 1  or the second axis AX 2 ). 
     In other words, according to some embodiments of the present disclosure, the photosensitive element holder metal sheet  231  may extend along the optical axis OA. By doing so, the structure of the photosensitive element holder rolling element accommodating portion  232  may be strengthened, and the damage to the photosensitive element holder rolling element accommodating portion  232  may be avoided. 
     Please refer to  FIG. 5 ,  FIG. 6  and  FIG. 7 , according to some embodiments of the present disclosure, the lower elastic element  42  may be in contact with the frame metal sheet  121 , and the photosensitive element holder rolling element  24  may not have a metal material. 
     According to some embodiments of the present disclosure, the lower elastic element  42  may have a metal material, so that the lower elastic element  42  may be electrically connected to the frame metal sheet  121 . 
     In some embodiments where the photosensitive element holder rolling element  24  does not have a metal material, even if the photosensitive element holder rolling element  24  is in direct contact with the frame metal sheet  121  and the photosensitive element holder metal sheet  231 , the frame metal sheet  121  and the photosensitive element holder metal sheet  231  is still not electrically connected through the photosensitive element holder rolling element  24 . However, according to some embodiments of the present disclosure, the frame metal sheet  121  and the photosensitive element holder metal sheet  231  may be electrically connected to each other through other elements. 
     According to some embodiments of the present disclosure, an external current may flow into the optical element driving mechanism  100  from the optical element holder circuit board  51 , and then flow into the frame metal sheet  121 , the lower elastic element  42  and the optical element holder driving coil  321  of the driving coil  32  of the driving assembly  30  in sequence. 
     In this way, the optical element holder  21  and the optical element OE may be driven to move along the optical axis OA. Moreover, it may contribute to the connection of the driving coil  32  with external electric current. 
     According to some embodiments of the present disclosure, an external current may flow into the optical element driving mechanism  100  from the optical element holder circuit board  51 , and then flow into the photosensitive element holder metal sheet  231  and the photosensitive element holder first driving coil  322 , the photosensitive element holder second driving coil  323  and the photosensitive element holder third driving coil  324  of the driving assembly  30 . 
     In this way, the photosensitive element holder  23  and the photosensitive element SE may be driven to move along the first axis AX 1  or the second axis AX 2 . Alternatively, the photosensitive element holder  23  and the photosensitive element SE may be driven to move around the optical axis OA. Moreover, it may contribute to the connection of the driving coil  32  with external electric current. 
     According to some embodiments of the present disclosure, the optical element holder guiding element  22  may have a rod shape (not shown in the figures), and the optical element holder guiding element  22  may have a metal material. Moreover, an external current may flow into the optical element driving mechanism  100  from the optical element holder circuit board  51 , and then flow into the optical element holder guiding element  22 , and the optical element holder driving coil  321  of the driving coil  32  of the driving assembly  30  in sequence. 
     In this way, the optical element holder  21  and the optical element OE may be driven to move along the optical axis OA. Moreover, it may contribute to the connection of the driving coil  32  with external electric current. 
     In this embodiment (the optical element holder guiding element  22  may have a rod shape), the photosensitive element holder rolling element  24  may have a metal material without affecting the current flow inside the optical element driving mechanism  100 . 
     According to some embodiments of the present disclosure, the optical element holder circuit board  51  may be attached to the optical element holder  21  (not shown in the figures), so that an external current may flow directly from the optical element holder circuit board  51  to the optical element holder driving coil  321  of the driving coil  32  of the driving assembly  30 . 
     In this embodiment (the optical element holder circuit board  51  is attached to the optical element holder  21 ), the photosensitive element holder rolling element  24  may have a metal material without affecting the current flow inside the optical element driving mechanism  100 . 
     According to some embodiments of the present disclosure, the direction of the current of the photosensitive element holder first driving coil  322  and the direction of the current of the photosensitive element holder second driving coil  323  may be the same when viewed along the optical axis OA (for example, the directions of the currents are clockwise or the directions of the currents are counterclockwise when viewed along the optical axis OA). 
     In this way, when the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  receive the currents with the same direction ((for example, the directions of the currents are clockwise or the directions of the currents are counterclockwise when viewed along the optical axis OA), the photosensitive element holder  23  and the photosensitive element SE may be driven to move along the first axis AX 1  (positively or negatively). 
     According to some embodiments of the present disclosure, the direction of the current of the photosensitive element holder first driving coil  322  and the direction of the current of the photosensitive element holder second driving coil  323  may be different when viewed along the optical axis OA (for example, the direction of one of the currents is clockwise while the direction of the other currents are counterclockwise when viewed along the optical axis OA). 
     In this way, when the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  receive the currents with different directions when viewed along the optical axis OA (for example, the direction of one of the currents is clockwise while the direction of the other currents are counterclockwise when viewed along the optical axis OA), the photosensitive element holder  23  and the photosensitive element SE may be driven to move (rotate) around the optical axis OA (clockwise or counterclockwise). 
     According to some embodiments of the present disclosure, the photosensitive element holder  23  and the photosensitive element SE may be driven to move along the second axis AX 2  (positively or negatively) when the photosensitive element holder third driving coil  324  receives current. 
     Please refer to  FIG. 9 ,  FIG. 9  is a cross-sectional view of the optical element driving mechanism  100  along line E-E′ of  FIG. 2 , wherein the magnetic field lines of the first driving magnetic element  311  and the magnetic field lines of the second driving magnetic element  312  are illustrated. 
     It should be noted that, in  FIG. 9 , the lines with arrows represent magnetic field lines of the first driving magnetic element  311  or the second magnetic driving element  312 , wherein the directions of the magnetic field lines shown in  FIG. 9  (as indicated by arrows) is only an example, which is not for limiting the embodiments of the present disclosure. 
     As shown in  FIG. 9 , according to some embodiments of the present disclosure, the magnetic force emitting surface (perpendicular to the magnetic field lines) of the first driving magnetic element  311  may be parallel to the optical axis OA. For example, the magnetic force emitting surface of the first driving magnetic element  311  may be perpendicular to the first axis AX 1 . 
     In this way, the optical element holder driving coil  321  may receive more magnetic force of the first driving magnetic element  311 , and a stronger driving force may be used to move the optical element holder  21  along the optical axis OA. 
     Please continue to refer to  FIG. 9 , the first driving magnetic element  311  may correspond to the optical element holder driving coil  321 , the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  at the same time. In this way, the number of required elements may be reduced, and the effect of miniaturization may be achieved. 
     As shown in  FIG. 9 , according to some embodiments of the present disclosure, the sensing element  60  may be disposed on the optical element holder  21 . Moreover, the sensing element  60  may correspond to the magnetic force emission surface of the first driving magnetic element  311 . In this way, the sensing element  60  may receive more of the magnetic force of the first driving magnetic element  311 , and thus it may sense the position of the optical element holder  21  more accurately. 
     Please refer to  FIG. 9 , according to some embodiments of the present disclosure, the magnetic force emitting surface (perpendicular to the magnetic field lines) of the second driving magnetic element  312  may be perpendicular to the optical axis OA. In this way, the photosensitive element holder first driving coil  322  and the photosensitive element holder second driving coil  323  may receive more magnetic force of the second driving magnetic element  312 , so that a stronger driving force may be used to move the photosensitive element holder  23  along the first axis AX 1  or to move (rotate) around the optical axis OA. 
     Please refer to  FIG. 10 .  FIG. 10  is a cross-sectional view of the optical element driving mechanism  100  along line F-F′ of  FIG. 2 , wherein the magnetic field lines of the third driving magnetic element  313  are illustrated. 
     It should be noted that, in  FIG. 10 , the lines with arrows represent magnetic field lines of the third driving magnetic element  313 , wherein the directions of the magnetic field lines shown in  FIG. 10  (as indicated by arrows) is only an example, which is not for limiting the embodiments of the present disclosure. 
     As shown in  FIG. 10 , according to some embodiments of the present disclosure, the magnetic force emitting surface (perpendicular to the magnetic field lines) of the third driving magnetic element  313  may be perpendicular to the optical axis OA. Thus, the photosensitive element holder third driving coil  324  may receive more magnetic force of the third driving magnetic element  313 , and a stronger driving force may be used to move the photosensitive element holder  23  along the second axis AX 2 . 
     Please refer to  FIG. 11 ,  FIG. 11  is a schematic view of an optical element driving mechanism  200  according to some other embodiments of the present disclosure, wherein the outer frame is shown as a dashed line. The main elements and the configuration of the optical element driving mechanism  200  is similar to the main elements and the configuration of optical element driving mechanism  100 , and the similar parts will not be repeated. 
     As shown in  FIG. 11 , the main difference between the optical element driving mechanism  200  and the optical element driving mechanism  100  is that the driving coil  32  of the driving assembly  30  of the optical element driving mechanism  200  may further include an optical element holder second driving coil  325 . 
     According to some embodiments of the present disclosure, the optical element holder second driving coil  32  may be disposed on the optical element holder  21 , and the optical element holder second driving coil  32  may correspond to the second magnetic driving element  312 . 
     In this way, a stronger driving force may be used to move the optical element holder  21  along the optical axis OA. 
     According to some embodiments of the present disclosure, the photosensitive element holder  23  of the movable part  20  of the optical element driving mechanism  100  and the optical element driving mechanism  200  may not include the photosensitive element holder rolling element accommodating portion  232 . Instead, the frame  12  of the fixed part  10  may include a photosensitive element holder rolling element accommodating portion (not shown in the drawings). Similarly, the photosensitive element holder rolling element accommodating portion (not shown in the figure) of the frame  12  may surround the photosensitive element holder rolling element  24  (not shown in  FIG. 11 ) to limit the range of movement of the photosensitive element holder rolling element  24 . 
     In general, the optical element driving mechanism of the embodiment of the present disclosure may drive the optical element holder to move along the optical axis by using a single driving magnetic element, and it may drive the photosensitive element holder to move along a direction that is perpendicular to the optical axis or to move (rotate) around the optical axis by using the same driving magnetic element. Furthermore, the optical element driving mechanism of the embodiment of the present disclosure may have an eccentric driving assembly, an eccentric optical element holder, and an eccentric optical element. Therefore, the volume and weight of the optical element driving mechanism may be reduced, and the effect of miniaturization may be achieved. 
     Furthermore, the optical element driving mechanism of the embodiment of the present disclosure may use magnetic force to return the photosensitive element holder to the original position by using the photosensitive element holder metal sheet. The optical element driving mechanism of the embodiment of the present disclosure may also electrically connect the elements of the optical element driving mechanism to an external circuit through the frame metal sheet. Moreover, the configuration of the magnetic force emitting surface of the driving magnetic element of the optical element driving mechanism of the embodiment of the present disclosure may be helpful for driving the optical element holder. Therefore, the volume and weight of the optical element driving mechanism may be reduced, and the effect of miniaturization may be achieved. 
     Although embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the spirit and scope of the disclosure as defined by the appended claims. For example, it will be readily understood by those skilled in the art that many of the features, functions, processes, and materials described herein may be varied while remaining within the scope of the present disclosure. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps. In addition, the scope of the present disclosure is defined by the scope of the appended claims. In addition, each scope of the claims is constructed as a separate embodiment, and various combinations of the claims and combinations of embodiments are within the scope of the present disclosure.