Patent Publication Number: US-2023136025-A1

Title: Optical member driving mechanism

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation of pending U.S. patent application Ser. No. 16/729,029, filed Dec. 27, 2019 and entitled “OPTICAL MEMBER DRIVING MECHANISM”, which claims the benefit of U.S. Provisional Application No. 62/785,593, filed Dec. 27, 2018, and claims priority of European Patent Application No. 19218896.9, filed Dec. 20, 2019, the entirety of which are incorporated by reference herein. 
    
    
     BACKGROUND 
     Technical Field 
     The disclosure relates to an optical member driving mechanism, and in particular to an optical member driving mechanism including a reflection member that is disposed in the housing of the optical member driving mechanism. 
     Description of the Related Art 
     With the development of technology, many electronic devices (such as smartphones and digital cameras) nowadays perform the functions of a camera or video recorder. The use of such electronic devices has become increasingly widespread, and these electronic devices have been designed for convenience and miniaturization to provide users with more choices. 
     Electronic devices with a camera or video function usually have a lens driving module disposed therein to drive a lens to move along an optical axis. Therefore, an autofocus (AF) and/or optical image stabilization (OIS) function is achieved. Light may pass through the lens and form an image on a photosensitive member. 
     However, during forming an optical image, external noise usually enters the photosensitive member due to reflection. As a result, the image quality is usually not good enough to meet the requirement of the image quality for users. Therefore, how to solve the aforementioned problem has become an important topic. 
     BRIEF SUMMARY 
     The present disclosure provides an optical member driving mechanism. The optical member driving mechanism includes a movable portion and a fixed portion. The movable portion includes a carrier for carrying an optical member with a first optical axis. The movable portion is movable relative to the fixed portion. The fixed portion includes a top surface, a first side surface and a second side surface. The top surface extends in a direction that is parallel to the first optical axis. The first side surface extends in a direction that is not parallel to the first optical axis from the edge of the top surface and faces the outlet end of the optical member. The second side surface extends in a direction that is not parallel to the first optical axis from the edge of the top surface and faces the incident end of the optical member. The shortest distance between the optical member and the first side surface is shorter than the shortest distance between the optical member and the second side surface. The optical member driving mechanism further includes an electromagnetic driving assembly that drives the movable portion to move relative to the fixed portion. The optical member driving mechanism also includes a noise-reducing structure disposed over the base and configured to avoid a noise entering a photosensitive member. 
     In an embodiment, the optical member further has a first section and a second section, the first section is closer to the incident end of the optical member than the second section, the first section and the second section are arranged along the first optical axis, and in a direction that is perpendicular to the first optical axis, the largest size of the first section is greater than the largest size of the second section. 
     In an embodiment, the housing further has: a first opening, a second opening and a third opening. The first opening is located on the first side surface. The second opening is located on the second side surface, wherein the first optical axis passes through the first opening and the second opening. The third opening is located on the top surface, wherein the distance between the third opening and the first opening is longer than the distance between the third opening and the second opening. 
     In an embodiment, the housing further has a third side surface and a plurality of holes that are located on the third side surface, and the third side surface is not parallel to the first side surface or the second side surface. In an embodiment, the optical member driving mechanism further includes a reflection member that is disposed in the housing, wherein the shortest distance between the reflection member and the first side surface is longer than the shortest distance between the reflection member and the second side surface. 
     In an embodiment, the reflection member has a second optical axis that is not parallel to the first optical axis. In an embodiment, the fixed portion further includes a frame that is disposed between the carrier and the housing, and when viewed in the direction that is parallel to the first optical axis, the frame and the carrier at least partially overlap. In an embodiment, the frame has a first jagged surface disposed to face the base. 
     In an embodiment, the carrier further includes a protruding portion that protrudes from the optical member and extends towards the base, and when viewed in the direction that is parallel to the first optical axis, the protruding portion and the optical member at least partially overlap. In an embodiment, the protruding portion further has a second jagged surface disposed to face the base. In an embodiment, the electromagnetic driving assembly comprises a magnetic member and a coil, and the magnetic member is a tripolar magnet. 
     In an embodiment, the fixed portion further includes a frame that is disposed between the carrier and the housing, and when viewed in a direction that is perpendicular to the first optical axis, the magnetic member is exposed from the frame. In an embodiment, the optical member driving mechanism further includes a first bonding material and a second bonding material, wherein the first bonding material is bonded between the housing and the frame, the second bonding material is bonded between the magnetic member and the frame, and the first bonding material is different from the second bonding material. 
     In an embodiment, the base further includes a first barrier and a second barrier, the first barrier and the second barrier protrude towards the top surface, and the shortest distance between the first barrier and the first side surface is shorter than the shortest distance between the second barrier and the first side surface. In an embodiment, the base further includes a stopping portion that is disposed between the carrier and the second side surface. In an embodiment, the base further includes a metallic member that is embedded in the stopping portion. 
     In an embodiment, when viewed in a direction that is perpendicular to the first optical axis, the carrier is partially exposed from the optical member, and the shortest distance between the exposed portion of the optical member and the first side surface is longer than the shortest distance between the unexposed portion of the optical member and the first side surface. 
     In an embodiment, the optical member driving mechanism further includes a sensing assembly for detecting the movement of the movable portion relative to the fixed portion, wherein when viewed in a direction that is perpendicular to the first optical axis, the sensing assembly and the optical member partially overlap. 
     In an embodiment, the optical member driving mechanism further includes a plurality of first elastic members disposed on the carrier and connected to the base. In an embodiment, the optical member driving mechanism further includes a plurality of second elastic members connected to the first elastic members and the base, wherein the second elastic members extend in the direction that is perpendicular to the first optical axis. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: 
         FIG.  1    is a perspective view illustrating an optical member driving mechanism in accordance with an embodiment of the present disclosure. 
         FIG.  2    is an exploded view illustrating the optical member driving mechanism shown in  FIG.  1   . 
         FIG.  3    is a cross-sectional view illustrating along line A-A shown in  FIG.  1   . 
         FIG.  4    is a perspective view illustrating the optical member driving mechanism shown in  FIG.  1    when viewed in another direction. 
         FIG.  5    is a perspective view illustrating the interior structure of the optical member driving mechanism in accordance with an embodiment of the present disclosure. 
         FIG.  6    is a perspective view illustrating the interior structure of the optical member driving mechanism shown in  FIG.  5    when viewed in another direction. 
         FIG.  7    is a perspective view illustrating the interior structure of the optical member driving mechanism in accordance with an embodiment of the present disclosure. 
         FIG.  8    is a top view illustrating the interior structure of the optical member driving mechanism in accordance with an embodiment of the present disclosure. 
         FIG.  9    is a side view illustrating the interior structure of the optical member driving mechanism shown in  FIG.  8   . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The optical member driving mechanisms of some embodiments of the present disclosure are described in the following description. However, it should be appreciated that the following detailed description of some embodiments of the disclosure provides various concepts of the present disclosure which may be performed in specific backgrounds that can vary widely. The specific embodiments disclosed are provided merely to clearly describe the usage of the present disclosure by some specific methods without limiting the scope of the present disclosure. 
     In addition, relative terms such as “lower” or “bottom,” “upper” or “top” may be used in the following embodiments in order to describe the relationship between one element and another element in the figures. It should be appreciated that if the device shown in the figures is flipped upside-down, the element located on the “lower” side may become the element located on the “upper” side. 
     It should be understood that although the terms “first,” “second,” “third,” etc. may be used herein to describe various elements, materials and/or portions, these elements, materials and/or portions are not limited by the above terms. These terms merely serve to distinguish different elements, materials and/or portions. Therefore, a first element, material and/or portion may be referred to as a second element, material and/or portion without departing from the teaching of some embodiments in the present disclosure. 
     Unless defined otherwise, all terms (including 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, in each case, the term, which is defined in a commonly used dictionary, should be interpreted as having a meaning that conforms to the relative skills of the present disclosure and the background or the context of the present disclosure, and should not be interpreted in an idealized or overly formal manner unless so defined in the present disclosure. In addition, the terms “substantially,” “approximately” or “about” may also be recited in the present disclosure, and these terms are intended to encompass situations or ranges that is substantially or exactly the same as the description herein. It should be noted that unless defined specifically, even if the above terms are not recited in the description, it should be read as the same meaning as those approximate terms are recited. 
       FIG.  1    is a schematic perspective view illustrating an optical member driving mechanism  801  in accordance with an embodiment of the present disclosure. It should be noted that, in this embodiment, the optical member driving mechanism  801  may be, for example, disposed in the electronic devices with camera function for driving an optical member  900 , and can perform an autofocus (AF) and/or optical image stabilization (OIS) function. 
     As shown in  FIG.  1   , the optical member driving mechanism  801  has a central axis C that is substantially parallel to the Z axis. The optical member driving mechanism  801  has a first optical axis O1 that is substantially parallel to the X axis. The optical member driving mechanism  801  includes a housing  810  which has a top surface  811  and a first side surface  812 . The top surface  811  extends in a direction that is parallel to the first optical axis O1 (i.e. the X-Y plane). The first side surface  812  extends from an edge of the top surface  811  along a direction (the Z axis) that is perpendicular to the first optical axis O1. In some embodiments, the first side surface  812  extends from the edge of the top surface  811  along a direction that is not parallel to the first optical axis O1. In addition, the housing  810  has a first opening  815  that is located on the first side surface  812 , and the first optical axis O1 may pass through the first opening  815 . 
     The optical member driving mechanism  801  further includes a reflection member  890  that is disposed in the housing  810  of the optical member driving mechanism  801 , and the reflection member  890  has a second optical axis O2 that is substantially parallel to the Z axis. In the present embodiment, the first optical axis O1 is substantially perpendicular to the second optical axis O2, but it is not limited thereto. In some embodiments, the first optical axis O1 is not parallel to the second optical axis O2. As a result, light may enter the optical member driving mechanism  801  along the second optical axis O2, and the direction of the light may be changed by the reflection member  890 , such that the light may pass through the optical member  900  along the first optical axis O1. After the light passes through the optical member  900 , it may travel to an image sensor (not shown) that is disposed out of the optical member driving mechanism  801 , and thereby an image may be generated on the electronic device. 
       FIG.  2    is an exploded view illustrating the optical member driving mechanism  801  shown in  FIG.  1   . In the present embodiment, the optical member driving mechanism  801  has a substantial rectangular structure. The optical member driving mechanism  801  mainly includes a fixed portion F, a movable portion M, a plurality of first elastic members  860 , a plurality of second elastic members  861 , a first electromagnetic driving assembly  840  and a second electromagnetic driving assembly  845 . The fixed portion F includes a housing  810 , a base  820 , a frame  850 , and a circuit component  870 . 
     The housing  810  is disposed on the base  820 , and protect the elements disposed inside the optical member driving mechanism  801 . In some embodiments, the housing  810  is made of metal or another material with sufficient hardness to provide good protection. The frame  850  is disposed in and affixed to the housing  810 . The circuit component  870  is disposed on the base  820  for transmitting electric signals, performing the autofocus (AF) and/or optical image stabilization (OIS) function. For example, the optical member driving mechanism  801  may control the position of the optical member  900  based on the aforementioned electric signals so as to form an image. 
     The movable portion M is movable relative to the fixed portion F. The movable portion M mainly includes a carrier  830  which carries the optical member  900 . As shown in  FIG.  2   , the carrier  830  is movably connected to the housing  810  and the base  820 . The first elastic members  860  are disposed on the carrier  830 . The second elastic members  861  extend in a vertical direction (the Z axis), and are connected to the first elastic members  860  and the base. As a result, the carrier  830  may be connected to the base  820  via the first elastic members  860  and the second elastic members  861 . For example, the first elastic members  860  and the second elastic members  861  are made of metal or another suitable elastic material. 
     The first electromagnetic driving assembly  840  includes first magnetic members  841  and first driving coils  842 . The first magnetic members  841  may be disposed on the frame  850 , and the corresponding first driving coils  842  are disposed on the carrier  830 . When current is applied to the first driving coils  842 , an electromagnetic driving force may be generated by the first driving coils  842  and the first magnetic members  841  (i.e. the first electromagnetic driving assembly  840 ) to drive the carrier  830  and the optical member  900  carried therein to move along a horizontal direction (the X-Y plane) relative to the base  820 , performing the autofocus (AF) and/or optical image stabilization (OIS) function. 
     In addition, the second electromagnetic driving assembly  845  includes second magnetic members  846  and second driving coils  847 . The second magnetic members  846  may be disposed on the carrier  830 , and the corresponding second driving coils  847  are disposed on the base  820 . For example, the second driving coils  847  may be flat-plate coils such that the difficulty and the required time for assembly may be reduced. When a current is applied to the second driving coils  847 , an electromagnetic driving force may be generated by the second electromagnetic driving assembly  845  to drive the carrier  830  and the optical member  900  carried therein to move along the first optical axis O1 (the X axis) relative to the base  820 , performing the autofocus (AF) function. The carrier  830  may be movably suspended between the frame  850  and the base  820  by the electromagnetic driving force of the first electromagnetic driving assembly  840 , the second electromagnetic driving assembly  845  and the force exerted by the first elastic members  860 , the second elastic members  861 . Furthermore, a magnetic permeable plate P is disposed on the second magnetic members  846  for concentrating the magnetic field of the second magnetic members  846  so that the efficiency of the second electromagnetic driving assembly  845  may be improved. In some embodiments, the magnetic permeable plate P may be made of metal or another material with sufficient magnetic permeability. 
     The sensing assembly  880  includes a sensor  881 , a reference member  882  and an integrated circuit (IC) component  883 . In the present embodiment, the sensor  881  and the integrated circuit component  883  are disposed on the base  820 , and the reference member  882  is disposed in the carrier  830 . A plurality of reference members  882  may be disposed. For example, the reference member  882  is a magnetic member, the sensor  881  may detect the change of the magnetic field of the reference member  882 , and the position of the carrier  830  (and the optical member  900 ) may be determined by the integrated circuit component  883 . In some embodiments, one of the sensor  881  and the reference member  882  is disposed on the fixed portion F, and the other of the sensor  881  and the reference member  882  is disposed on the movable portion M. 
       FIG.  3    is a cross-sectional view illustrating along line A-A shown in  FIG.  1   . As shown in  FIG.  3   , the optical member  900  has an incident end I and an outlet end  0 . In the present embodiment, the light may enter the optical member  900  from the incident end I along the first optical axis O1, and exit the optical member  900  from the outlet end  0 . In the present embodiment, the first side surface  812  faces the outlet end  0  of the optical member  900 , and the second side surface  813  faces the incident end I of the optical member  900 . 
     Since the reflection member  890  is also disposed in the housing  810 , the optical member  900  is not located at the center of the optical member driving mechanism  801 . In the present embodiment, the reflection member  890  is closer to the second side surface  813  than the optical member  900 , and the optical member  900  is closer to the first side surface  812  than the reflection member  890 . In other words, the shortest distance (a first distance W1) between the reflection member  890  and the first side surface  812  is longer than the shortest distance (a second distance W2) between the reflection member  890  and the second side surface  813 . The shortest distance (a third distance W3) between the optical member  900  and the first side surface  812  is shorter than the shortest distance (a fourth distance W4) between the optical member  900  and the second side surface  813 . In the present embodiment, the frame  850  is disposed between the carrier  830  and the housing  810 , and when viewed in a direction (the X axis) that is parallel to the first optical axis O1, the frame  850  and the carrier  830  at least partially overlap. 
       FIG.  4    is a perspective view illustrating the optical member driving mechanism  801  shown in  FIG.  1    when viewed in another direction. As shown in  FIG.  4   , the housing further has a second side surface  813  and a third side surface  814 . In the present embodiment, the second side surface  813  extends from an edge of the top surface  811  along a direction (the Z axis) that is perpendicular to the first optical axis O1. In some embodiments, the second side surface  813  extends from the edge of the top surface  811  along a direction that is not parallel to the first optical axis O1. The housing  810  has a second opening  816  that is located on the second side surface  813 , and the first optical axis O1 may pass through the second opening  816 . In other words, the first side surface  812  and the second side surface  813  are substantially parallel to each other. 
     The third side surface  814  extends from an edge of the top surface  811  along a direction (the Z axis) that is perpendicular to the first optical axis O1, and is located between the first side surface  812  and the second side surface  813 . In the present embodiment, the third side surface  814  is perpendicular to the first side surface  812  and the second side surface  813 . In some embodiments, the third side surface  814  is not parallel to the first side surface  812  or the second side surface  813 . A plurality of holes  818  may be disposed on the third side surface  814  and correspond to the reflection member  890 . For example, an adhesive (not shown) may be disposed in the holes  818 , such that the reflection member  890  may be affixed in the optical member driving mechanism  801 . 
     In addition, a third opening  817  may be formed on the top surface  811 , and correspond to the reflection member  890 , such that the light is able to enter the optical member  900  located inside the optical member driving mechanism  801 . Since the reflection member  890  is disposed near the first side surface  812 , the third opening  817  may be closer to the second opening  816  instead of the first opening  815 . In other words, the distance between the third opening  817  and the first opening  815  may be greater than the distance between the third opening  817  and the second opening  816 . 
     It should be noted that in the present embodiment, the light would not actually pass through the second opening  816 . However, during the assembly of the optical member driving mechanism  801 , the optical member  900  may be disposed in the optical member driving mechanism  801  via the second opening  816  first, and then the reflection member  890  is disposed in the optical member driving mechanism  801 . An optical calibration process is performed to the optical member  900  and the reflection member  890 , and thereby the yield of the optical member driving mechanism  801  may be increased. The above design may simplify the manufacturing process. 
       FIG.  5    is a perspective view illustrating the interior structure of the optical member driving mechanism  801  when viewed in the outlet end  0  of the optical member  900 . It should be appreciated that in order to clearly show the interior structure of the optical member driving mechanism  801 , the housing  810  and the reflection member  890  are not illustrated in the present embodiment. As shown in  FIG.  5   , the base  820  further includes a first barrier  821  and a second barrier  822 , wherein the first barrier  821  and the second barrier  822  protrude towards the top surface  811  of the housing  810 , and the shortest distance between the first barrier  821  and the first side surface  812  is shorter than the shortest distance between the second barrier  822  and the first side surface  812 . Thanks to the arrangement of the first barrier  821  and the second barrier  822 , light is prevented from entering the image sensor due to it being reflected by the housing  810  and the circuit component  870 . It should be noted that, although the first barrier  821  and the second barrier  822  are illustrated in the present embodiment, this merely serves as an example. Those skilled in the art may adjust the positions or number of barriers. In some embodiments, a jagged structure or any other suitable irregular structure may be on the base  820  (such as on the first barrier  821  and/or the second barrier  822 ) by a laser engraving process, and thereby the reflection inside the optical member driving mechanism  801  may be reduced. 
     In addition, in the present embodiment, when viewed in a direction (the Z axis) that is perpendicular to the first optical axis O1, the first magnetic members  841  are partially exposed from the frame  850 . In the present embodiment, the first magnetic members  841  are tripolar magnets such that the assembly process may be simplified, and the assembly precision and the push strength may be enhanced. However, the present disclosure is not limited thereto. In some other embodiments, each of the first magnetic members  841  may also be a combination of three magnets. Furthermore, the optical member driving mechanism  801  further includes a first bonding material and a second bonding material (not shown), wherein the first bonding material is bonded between the housing  810  and the frame  850 , the second bonding material is bonded between the first magnetic members  841  and the frame  850 . Since in some embodiments, the housing  810  and the first magnetic members  841  are affixed to the frame  850  by different processes, the first bonding material is different from the second bonding material. For example, the first bonding material is a light-curing adhesive, and thereby after the housing  810  and the frame  850  are affixed, subsequent assembly process (such as the process of affixing the first magnetic members  841  and the frame  850 ) may be performed in a short time. 
       FIG.  6    is a perspective view illustrating the interior structure of the optical member driving mechanism  801  when viewed in the incident end I of the optical member  900 . As shown in  FIG.  6   , the base further includes a stopping portion  823  that is disposed between the carrier  830  and the second side surface  813  (as shown in  FIG.  4   ). Thanks to the arrangement of the stopping portion  823 , the moving range of the carrier  830  may be limited. As a result, collisions between the carrier  830  the reflection member  890  may be avoided, and the reflection member  890  and/or the optical member  900  can remain undamaged. In addition, a metallic member  824  is embedded into the stopping portion  823 , enhancing the structural strength of the stopping portion  823 . Therefore, the stopping portion  823  is prevented from multiple collisions and remains undamaged. 
       FIG.  7    is a perspective view illustrating the interior structure of the optical member driving mechanism  801  in accordance with an embodiment of the present disclosure. It should be noted that in order to clearly show the structure of the frame  850  and the carrier  830 , the frame  850 , the carrier  830  and the optical member  900  are illustrated upside-down. That is, the upper side of  FIG.  7    is towards the base  820 , and the lower side is towards the top surface  811  of the housing  810 . As shown in  FIG.  7   , the frame  850  has a first jagged surface  851  that is disposed to face the base  820 . In addition, the carrier  830  further includes a protruding portion  831  that protrudes from the optical member  900  and extends towards the base  820 . When viewed in a direction (the X axis) that is parallel to the first optical axis O1, the protruding portion  831  and the optical member  900  at least partially overlap. The protruding portion  831  further has a second jagged surface  832  that is disposed to face the base  820 . 
     Thanks to the arrangement of the protruding portion  831 , the possibility that the light directly illuminates the inner surface of the metallic housing  810  may be reduced, such that the light reflection may also be reduced. Furthermore, the first jagged surface  851  and the second jagged surface  832  are configured for weakening the intensity of light reflection after the light illuminates the above jagged surfaces. Since the possibility and/or intensity of the light reflected inside the optical member driving mechanism  801  may be reduced, noise may be less likely to enter the image sensor due to reflection. Therefore, image quality may be unaffected. 
     For example, the jagged structure on the first jagged surface  851  and/or the second jagged surface  832  may be formed by a laser engraving process. In some embodiments, the size in the Z axis of the above jagged structures may be in a range from 0.1 mm to 0.4 mm, but it is not limited thereto. In addition, the jagged structures may be formed as regular structures or irregular structures as required. It should be noted that although the first jagged surface  851  and the second jagged surface  832  are both disposed in the present embodiment, it merely serves as an example. Those skilled in the art may determine whether the first jagged surface  851  and/or the second jagged surface  832  are disposed, or adjust the position of the first jagged surface  851  and/or the second jagged surface  832 . 
     The optical member driving mechanism  801  further includes an extinction sheet E that is disposed between the carrier  830  and the optical member  900 . More specifically, the extinction sheet E is disposed in a gap between the carrier  830  and the optical member  900 . In some embodiments, the extinction sheet E may also be disposed on the second jagged surface  832 , or disposed between the first barrier  821  and the second barrier  822 , but it is not limited thereto. Thanks to the arrangement of the extinction sheet E, the reflection of the noise may be effectively reduced, avoiding the noise entering the image sensor. For example, the extinction sheet E may be made of resin or any other suitable material, and has a porous structure. In some embodiments, the extinction sheet E may lower the reflectivity of the light with a wavelength between 250 nm and 2500 nm below 1.6%. In some embodiments, the thickness of the extinction sheet E may be in a range from 0.1 mm to 0.5 mm. 
     In addition, the optical member  900  further has a first section  901  and a second section  902  (as shown in  FIG.  8   ), wherein the first section  901  is closer to the incident end I of the optical member  900 . The first section  901  and the second section  902  are arranged along the first optical axis O1, wherein the first section  901  is closer to the second side surface  813  than the second section  902 . In other words, the shortest distance between the first section  901  and the second side surface  813  is shorter than the shortest distance between the second section  902  and the second side surface  813 . In a direction (the Y axis) that is perpendicular to the first optical axis O1, the largest size of the first section  901  is greater than the largest size of the second section  902 . That is, the width of the first section  901  is greater than the width of the second section  902  in the Y axis. Since the size of the first section  901  is larger, the carrier  830  may cover the second section  902 , and the first section  901  of the optical member  900  may be exposed. 
       FIG.  8    is a top view illustrating the base  820 , the circuit component  870 , the second electromagnetic driving assembly  845 , the sensing assembly  880  and the optical member  900 , and  FIG.  9    is a side view illustrating the structure shown in  FIG.  8    when viewed in the incident end I. As shown in  FIGS.  8  and  9   , when viewed in a direction (the Z axis) that is perpendicular to the first optical axis O1, the integrated circuit component  883  of the sensing assembly  880  and the optical member  900  may partially overlap. In the present embodiment, the second magnetic members  846  are tripolar magnets. In some other embodiments, each of the second magnetic members  846  may also be a combination of three magnets. 
     As set forth above, the embodiments of the present disclosure provide an optical member driving mechanism including a reflection member that is disposed in the housing of the optical member driving mechanism. By means of arranging the reflection member in the housing, the reflection member may be effectively protected and remain undamaged. In addition, the embodiments of the present disclosure provide various structures configured to avoid refection, such as jagged surfaces, barriers, and/or extinction plates, etc. Therefore, the noise may be prevented from entering the image sensor due to reflection, preserving image quality. 
     While the embodiments and the advantages of the present disclosure have been described above, it should be understood that those skilled in the art may make various changes, substitutions, and alterations to the present disclosure without departing from the spirit and scope of the present disclosure. In addition, the scope of the present disclosure is not limited to the processes, machines, manufacture, composition, devices, methods and steps in the specific embodiments described in the specification. Those skilled in the art may understand existing or developing processes, machines, manufacture, compositions, devices, methods and steps from some embodiments of the present disclosure. As long as those may perform substantially the same function in the aforementioned embodiments and obtain substantially the same result, they may be used in accordance with some embodiments of the present disclosure. Therefore, the scope of the present disclosure includes the aforementioned processes, machines, manufacture, composition, devices, methods, and steps. Furthermore, each of the appended claims constructs an individual embodiment, and the scope of the present disclosure also includes every combination of the appended claims and embodiments.