Patent Publication Number: US-2022239835-A1

Title: Reflection module capable of image stabilization, camera module and electronic device

Description:
RELATED APPLICATIONS 
     This application is a continuation patent application of U.S. application Ser. No. 17/060,047, filed on Sep. 30, 2020, which claims priority to Taiwan Application 109124665, filed on Jul. 22, 2020, which is incorporated by reference herein in its entirety. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a reflection module, a camera module and an electronic device, more particularly to a reflection module capable of image stabilization and a camera module applicable to an electronic device. 
     Description of Related Art 
     With the development of semiconductor manufacturing technology, the performance of image sensors has been improved, and the pixel size thereof has been scaled down. Therefore, featuring high image quality becomes one of the indispensable features of an optical system nowadays. Furthermore, due to the rapid changes in technology, electronic devices equipped with optical systems are trending towards multi-functionality for various applications, and therefore the functionality requirements for the optical systems have been increasing. 
     In recent years, there is an increasing demand for electronic devices featuring compact size, but conventional optical systems, especially the telephoto optical systems with a long focal length, are difficult to meet both the requirements of high image quality and compactness. Conventional telephoto optical systems usually have shortcomings of overly long total length, poor image quality or overly large size, which is unable to meet the requirements of the current technology trends. To achieve compactness, the optical systems may be configured to have a folded optical axis so as to reduce the dimension of the optical systems in a specific direction, thereby reducing the total system size. Moreover, the optical systems can be configured with anti-vibration function for achieving high image quality. However, to meet the abovementioned requirements, a driving unit of complex structure is required to drive an optical axis folding element, which results in more complex structure and more weight of the optical systems. 
     Accordingly, how to improve the optical systems for simplifying the structure of the lens assembly, achieving a compact size and maintaining high image quality so as to meet the requirement of high-end-specification electronic devices is an important topic in this field nowadays. 
     SUMMARY 
     According to one aspect of the present disclosure, a reflection module capable of image stabilization includes a reflecting element, a rotatable holder, a fixed base, a spherical supporting structure, an auxiliary supporting structure and an image stabilizing actuator. The reflecting element has a reflecting surface, and the reflecting element is disposed on the rotatable holder and configured to fold an optical path of incident light. The fixed base is connected to the rotatable holder via an elastic element. The spherical supporting structure is disposed between the rotatable holder and the fixed base. The auxiliary supporting structure is disposed on at least one of the rotatable holder and the fixed base, and the auxiliary supporting structure corresponds to the spherical supporting structure. At least a part of the image stabilizing actuator is disposed on the rotatable holder, and the image stabilizing actuator is configured to drive the rotatable holder to rotate by taking the spherical supporting structure as a rotation center. In addition, the spherical supporting structure is a ball, and the spherical supporting structure has at least three contact points with the auxiliary supporting structure. 
     According to another aspect of the present disclosure, a reflection module capable of image stabilization includes a reflecting element, a rotatable holder, a fixed base, a spherical supporting structure, an auxiliary supporting structure and an image stabilizing actuator. The reflecting element has a reflecting surface, and the reflecting element is disposed on the rotatable holder and configured to fold an optical path of incident light. The fixed base is connected to the rotatable holder via an elastic element. The spherical supporting structure is disposed between the rotatable holder and the fixed base. The auxiliary supporting structure is disposed on at least one of the rotatable holder and the fixed base, and the auxiliary supporting structure corresponds to the spherical supporting structure. At least a part of the image stabilizing actuator is disposed on the rotatable holder, and the image stabilizing actuator is configured to drive the rotatable holder to rotate by taking the spherical supporting structure as a rotation center. In addition, the spherical supporting structure includes at least one spherical surface, the auxiliary supporting structure includes at least two convex surfaces, and the at least one spherical surface has at least two contact points with the at least two convex surfaces. 
     According to another aspect of the present disclosure, a reflection module capable of image stabilization includes a reflecting element, a rotatable holder, a fixed base, a spherical supporting structure, an auxiliary supporting structure and an image stabilizing actuator. The reflecting element has a reflecting surface, and the reflecting element is disposed on the rotatable holder and configured to fold an optical path of incident light. The fixed base is connected to the rotatable holder via an elastic element. The spherical supporting structure is disposed between the rotatable holder and the fixed base. The auxiliary supporting structure is disposed on at least one of the rotatable holder and the fixed base, and the auxiliary supporting structure corresponds to the spherical supporting structure. At least a part of the image stabilizing actuator is disposed on the rotatable holder, and the image stabilizing actuator is configured to drive the rotatable holder to rotate by taking the spherical supporting structure as a rotation center. In addition, the spherical supporting structure includes at least one spherical surface, and the at least one spherical surface has at least three contact points with the auxiliary supporting structure. 
     According to another aspect of the present disclosure, a camera module includes the aforementioned reflection module, an imaging lens module and an image sensor. The reflection module is disposed on an object side of the imaging lens module, and the image sensor is disposed on an image surface of the imaging lens module. In addition, the reflection module is configured to stabilize an image signal captured by the image sensor. 
     According to another aspect of the present disclosure, an electronic device includes the aforementioned camera module. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure can be better understood by reading the following detailed description of the embodiments, with reference made to the accompanying drawings as follows: 
         FIG. 1  is a perspective view of a camera module according to the 1st embodiment of the present disclosure; 
         FIG. 2  is a partially exploded view of the camera module in  FIG. 1 ; 
         FIG. 3  is an exploded view of some components of the camera module in  FIG. 1 ; 
         FIG. 4  is another exploded view of some components of the camera module in  FIG. 1 ; 
         FIG. 5  is a cross-sectional view of the camera module along line  5 - 5 ′ in  FIG. 1 ; 
         FIG. 6  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 3 ; 
         FIG. 7  is an enlarged view of region A of  FIG. 6 ; 
         FIG. 8  is a perspective view of a camera module according to the 2nd embodiment of the present disclosure; 
         FIG. 9  is a partially exploded view of the camera module in  FIG. 8 ; 
         FIG. 10  is an exploded view of some components of the camera module in  FIG. 8 ; 
         FIG. 11  is another exploded view of some components of the camera module in  FIG. 8 ; 
         FIG. 12  is a cross-sectional view of the camera module along line  12 - 12 ′ in  FIG. 8 ; 
         FIG. 13  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 10 ; 
         FIG. 14  is an enlarged view of region B of  FIG. 13 ; 
         FIG. 15  is a perspective view of a camera module according to the 3rd embodiment of the present disclosure; 
         FIG. 16  is a partially exploded view of the camera module in  FIG. 15 ; 
         FIG. 17  is an exploded view of some components of the camera module in  FIG. 15 ; 
         FIG. 18  is another exploded view of some components of the camera module in  FIG. 15 ; 
         FIG. 19  is a cross-sectional view of the camera module along line  19 - 19 ′ in  FIG. 15 ; 
         FIG. 20  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 17 ; 
         FIG. 21  is an enlarged view of region C of  FIG. 20 ; 
         FIG. 22  is a cross-sectional view of a camera module according to the 4th embodiment of the present disclosure; 
         FIG. 23  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 22 ; 
         FIG. 24  is an enlarged view of region D of  FIG. 23 ; 
         FIG. 25  is a cross-sectional view of a camera module according to the 5th embodiment of the present disclosure; 
         FIG. 26  is a cross-sectional view of a camera module according to the 6th embodiment of the present disclosure; 
         FIG. 27  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 26 ; 
         FIG. 28  is an enlarged view of region E of  FIG. 27 ; 
         FIG. 29  is one perspective view of an electronic device according to the 7th embodiment of the present disclosure; 
         FIG. 30  is another perspective view of the electronic device in  FIG. 29 ; 
         FIG. 31  is an image captured by an ultra-wide-angle camera module; 
         FIG. 32  is an image captured by a high pixel camera module; 
         FIG. 33  is an image captured by a telephoto camera module; and 
         FIG. 34  is one perspective view of an electronic device according to the 8th embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing. 
     The present disclosure provides a reflection module capable of image stabilization, and the reflection module includes a reflecting element, a rotatable holder, a fixed base, a spherical supporting structure, an auxiliary supporting structure and an image stabilizing actuator. 
     The reflecting element has a reflecting surface, and the reflecting element is disposed on the rotatable holder and configured to fold an optical path of incident light. The reflecting element can be, for example, a prism or a reflection mirror, but the present disclosure is not limited thereto. The fixed base is connected to the rotatable holder via an elastic element. The spherical supporting structure is disposed between the rotatable holder and the fixed base. The auxiliary supporting structure is disposed on at least one of the rotatable holder and the fixed base, and the auxiliary supporting structure corresponds to the spherical supporting structure. At least a part of the image stabilizing actuator is disposed on the rotatable holder, and the image stabilizing actuator is configured to drive the rotatable holder to rotate by taking the spherical supporting structure as a rotation center, such that the reflecting element can be rotated with the rotatable holder. In addition, the rotatable holder can pitch and yaw. Please refer to  FIG. 34 , which shows pitch DP and yaw DY in a rotatable holder of the camera module  10  of the electronic device  8 . 
     According to the present disclosure, the spherical supporting structure of the reflection module capable of image stabilization serves as a fulcrum to provide the reflecting element with a degree of freedom in rotation, such that the requirement of image stabilization is achieved. 
     In one configuration, the spherical supporting structure can be a ball, and the spherical supporting structure has at least three contact points with the auxiliary supporting structure. Therefore, the spherical supporting structure and the auxiliary supporting structure contact each other in point contact, so the contact area between the spherical supporting structure and the auxiliary supporting structure is small, such that it is favorable for minimizing friction therebetween when the reflecting element rotates and reducing the offset of the rotation center; furthermore, it is favorable for the spherical supporting structure to rotate within a fixed position in a small rotation angle. Moreover, the ball can have two spherical surfaces respectively facing toward the rotatable holder and the fixed base, and the two spherical surfaces and the auxiliary supporting structure can abut against each other. Please refer to  FIG. 5 , which shows the spherical surface  1551  of the spherical supporting structure  155  abutting against the auxiliary balls  1561  of the auxiliary supporting structure  156 , and the spherical surface  1552  of the spherical supporting structure  155  abutting against the pyramidal recess  1562  of the auxiliary supporting structure  15 , wherein the spherical surface  1551  faces toward the fixed base  151  and the spherical surface  1552  faces toward the rotatable holder  153 . 
     In one configuration, the spherical supporting structure can include at least one spherical surface, the auxiliary supporting structure can include at least two convex surfaces, and the at least one spherical surface can have at least two contact points with the at least two convex surfaces. Therefore, the spherical supporting structure and the auxiliary supporting structure contacting each other with convex surfaces is favorable for minimizing friction therebetween when the reflecting element rotates and reducing the offset of the rotation center; furthermore, it is favorable for preventing mechanical interference between the rotatable holder and the fixed base. Please refer to  FIG. 23  and  FIG. 24 , which show the fixed base  451 , the spherical supporting structure  455  and the auxiliary supporting structure  456  in the 4th embodiment of the present disclosure, wherein the spherical supporting structure  455  includes two balls  4553 , the auxiliary supporting structure  456  includes two auxiliary balls  4561 , and each of the two balls  4553  of the spherical supporting structure  455  has two contact points with the auxiliary balls  4561  of the auxiliary supporting structure  456 . In addition, the at least one spherical surface of the spherical supporting structure can be a spherical surface of a ball or a spherical protrusion. Please refer to  FIG. 5  and  FIG. 25 , which respectively show that the at least one spherical surface of the spherical supporting structure  155  is a spherical surface of a ball and the at least one spherical surface of the spherical supporting structure  555  is a spherical surface of a spherical protrusion, but the present disclosure is not limited the type of spherical supporting structure. 
     In one configuration, the spherical supporting structure can include at least one spherical surface, and the at least one spherical surface can have at least three contact points with the auxiliary supporting structure. Therefore, the spherical supporting structure and the auxiliary supporting structure contact each other in point contact, so the contact area between the spherical supporting structure and the auxiliary supporting structure is small, such that it is favorable for minimizing friction therebetween when the reflecting element rotates and reducing the offset of the rotation center; furthermore, it is favorable for the spherical supporting structure to rotate within a fixed position in a small rotation angle. Moreover, the at least one spherical surface of the spherical supporting structure can be a spherical surface of a ball or a spherical protrusion, but the present disclosure is not limited thereto. 
     The elastic element can provide a preload force to the rotatable holder in a direction towards the fixed base, such that the spherical supporting structure located between the fixed base and the rotatable holder supports the rotatable holder. Therefore, it is favorable for providing the feasibility of the rotatable holder assembled to the spherical supporting structure. Moreover, the elastic element can surround the spherical supporting structure. Therefore, it is favorable for providing an evenly distributed preload force so as to prevent the spherical supporting structure from being easily damaged. In this specification, the term of “one element being perpendicular to another element” can indicate that an angle between two elements (e.g., two lines, two surfaces, or one line and one surface) is 90 degrees or approximately 90 degrees. 
     The image stabilizing actuator can include at least one driving magnet and at least one driving coil. One of the driving magnet and the driving coil is disposed on the rotatable holder, and the other of the driving magnet and the driving coil is disposed on the fixed base. Therefore, it is favorable for providing a rotation driving force to the rotatable holder. Moreover, the driving magnet and the driving coil can face each other in a direction perpendicular to the reflecting surface. Therefore, it is favorable for forming an efficient space arrangement so as to achieve compactness. Moreover, the number of the at least one driving magnet can be at least two, and the number of the at least one driving coil can be at least two. Therefore, it is favorable for providing at least two axial rotation driving forces. In one configuration of at least two driving magnets, the reflection module can further include at least two position sensing elements, and the position sensing elements and the driving magnets can face each other in a direction perpendicular to the reflecting surface. Therefore, it is favorable for the position sensing elements to detect a position of the rotatable holder. 
     According to the present disclosure, the reflection module capable of image stabilization can further include a printed circuit board. One of the printed circuit board and the driving magnet is disposed on the rotatable holder, the other is disposed on the fixed base, and the driving coil is disposed on the printed circuit board. Therefore, it is favorable for the printed circuit board to provide driving current for the driving coil. 
     When a curvature radius of the spherical supporting structure is R, and a minimum distance between the spherical supporting structure and the reflecting surface is D, the following condition can be satisfied: 0.3&lt;R/D&lt;12. Therefore, it is favorable for obtaining a proper rotation angle and a proper ratio range of rotation stability. Moreover, the following condition can also be satisfied: 0.5&lt;R/D&lt;10. Therefore, it is favorable for obtaining an even better ratio range of rotation stability. Please refer to  FIG. 5 , which shows a schematic view of R and D according to the 1st embodiment of the present disclosure. 
     According to the present disclosure, there can be no relative displacement between the spherical supporting structure and the fixed base. Therefore, it is favorable for the spherical supporting structure to be more efficiently assembled. 
     The auxiliary supporting structure can include a ball, a spherical protrusion or a pyramidal recess, and the present disclosure is not limited thereto. In one configuration, the auxiliary supporting structure can include at least two auxiliary balls configured for supporting the spherical supporting structure, and the at least two auxiliary balls have the at least two convex surfaces. Therefore, the auxiliary supporting structure contacting the spherical supporting structure with auxiliary balls is favorable for more effectively reducing friction therebetween. Moreover, the auxiliary supporting structure can also include at least three auxiliary balls. In one configuration, the auxiliary supporting structure can include at least two spherical protrusions configured for supporting the spherical supporting structure, and the at least two spherical protrusions have the at least two convex surfaces. Therefore, the design of spherical protrusion is favorable for reducing manufacturing costs while achieving friction reduction effect. Moreover, the auxiliary supporting structure can also include at least three spherical protrusions. In one configuration, the auxiliary supporting structure can include a pyramidal recess, and the pyramidal recess is configured to support the spherical supporting structure. Therefore, the design of pyramidal recess is favorable for increasing manufacturing efficiency and structural stability of the spherical supporting structure. Moreover, the pyramidal recess can be a pyramid shape having a triangular or rectangular base and plural lateral surfaces, but the present disclosure is not limited thereto. 
     The spherical supporting structure can be made of ferromagnetic material, such that the spherical supporting structure can be attracted to the rotatable holder or the fixed base by magnetic force. Therefore, it is favorable for increasing assembling stability of the spherical supporting structure. 
     The reflecting element can be a plastic prism manufactured by injection molding. Therefore, it is favorable for providing the manufacturability of the plastic prism so as to increase the production capacity of the reflecting element. Moreover, the reflecting element can further have a light entrance surface and a light exit surface, the light entrance surface and the reflecting surface are disposed corresponding to each other in the light entrance direction, and the light exit surface and the reflecting surface are disposed corresponding to each other in the light exit direction, such that light passes through, in order from an object side to an image side along the optical path, the light entrance surface, the reflecting surface and the light exit surface. Moreover, at least one of the light entrance surface and the light exit surface can have an optical aspheric surface, such that the reflecting element can have light refractive power. Therefore, it is favorable for providing better optical resolving power. 
     The present disclosure provides a camera module including the aforementioned reflection module capable of image stabilization, an imaging lens module and an image sensor. The reflection module is disposed on the object side of the imaging lens module, and the image sensor is disposed on an image surface of the imaging lens module. In addition, the reflection module is configured to stabilize the image signal captured by the image sensor. 
     According to the present disclosure, the reflecting element can further have an engagement structure surrounding the reflecting surface, and the reflecting element can be attached to the rotatable holder via the engagement structure. Therefore, it is favorable for minimizing assembly tolerance of the reflecting element and for the geometric center of the reflecting element to be aligned with the rotation center, thus maintaining image quality. Moreover, the engagement structure is configured to align the geometric center of the reflecting surface with the center of the spherical supporting structure, which can further make the light exit surface of the reflecting element coaxially aligned with the optical axis of the imaging lens module. 
     According to the present disclosure, the camera module can further include an auto focus driving unit. At least a part of the auto focus driving unit is disposed on the imaging lens module, and the auto focus driving unit is configured to drive the imaging lens module to move in a direction parallel to its optical axis. 
     According to the present disclosure, the aforementioned features and conditions can be utilized in numerous combinations so as to achieve corresponding effects. 
     According to the above description of the present disclosure, the following specific embodiments are provided for further explanation. 
     1st Embodiment 
     Please refer to  FIG. 1  to  FIG. 7 , where  FIG. 1  is a perspective view of a camera module according to the 1st embodiment of the present disclosure,  FIG. 2  is a partially exploded view of the camera module in  FIG. 1 ,  FIG. 3  is an exploded view of some components of the camera module in  FIG. 1 ,  FIG. 4  is another exploded view of some components of the camera module in  FIG. 1 ,  FIG. 5  is a cross-sectional view of the camera module along line  5 - 5 ′ in  FIG. 1 ,  FIG. 6  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 3 , and  FIG. 7  is an enlarged view of region A of  FIG. 6 . 
     In this embodiment, a camera module  10  includes a casing  11 , a frame body  12 , an imaging lens module  13 , an image sensor  14 , a reflection module capable of image stabilization  15 , a first printed circuit board  16  and an auto focus driver unit  17 . 
     The casing  11  is disposed on the frame body  12 , and the casing  11  and the frame body  12  together form an accommodating space SP. The casing  11  has an aperture  110  for light entering, and the frame body  12  has an opening  120  for light exiting. 
     The imaging lens module  13  is disposed in the accommodating space SP, and the imaging lens module  13  includes an imaging lens assembly  131  and a lens holder  132  for holding the imaging lens assembly  131 . In addition, the lens holder  132  is movably disposed in the accommodating space SP. 
     The image sensor  14  is disposed on an image surface  133  of the imaging lens module  13 , and the reflection module  15  is disposed in the accommodating space SP and located on an object side of the imaging lens module  13 . The reflection module  15  is configured to stabilize the image signal captured by the image sensor  14 . 
     The reflection module  15  includes a fixed base  151 , an elastic element  152 , a rotatable holder  153 , a reflecting element  154 , a spherical supporting structure  155 , an auxiliary supporting structure  156 , a second printed circuit board  157 , an image stabilizing actuator  158  and two position sensing elements  159 . 
     The fixed base  151  is disposed on the frame body  12 , and the rotatable holder  153  is connected to the fixed base  151  via the elastic element  152 . 
     The reflecting element  154  is a plastic prism manufactured by injection molding, and the reflecting element  154  is disposed on the rotatable holder  153 . The reflecting element  154  and the fixed base  151  are located on two opposite sides of the rotatable holder  153 . The reflecting element  154  has a reflecting surface  1541 , a light entrance surface  1542  and a light exit surface  1543 . The reflecting surface  1541  is configured to fold an optical path of incident light. The light entrance surface  1542  is disposed corresponding to the reflecting surface  1541 , and the light exit surface  1543  is disposed corresponding to the reflecting surface  1541 . The light entrance surface  1542  faces toward the aperture  110  of the casing  11 , and the light exit surface  1543  faces toward the imaging lens module  13 . As such, incident light passes through, in order from the object side to the image side along the optical path, the light entrance surface  1542 , the reflecting surface  1541  and the light exit surface  1543 . 
     The spherical supporting structure  155  is a ball disposed between the rotatable holder  153  and the fixed base  151 . The auxiliary supporting structure  156  includes three auxiliary balls  1561  and a pyramidal recess  1562  corresponding and configured to support the spherical supporting structure  155 . The auxiliary balls  1561  are disposed in an accommodation recess  1511  of the fixed base  151 , and the pyramidal recess  1562  is recessed from a surface of the rotatable holder  153  facing the fixed base  151 . In this embodiment, the pyramidal recess  1562  is a square based pyramidal recess having four lateral surfaces. Furthermore, the spherical supporting structure  155  has two spherical surfaces  1551  and  1552  respectively facing the fixed base  151  and the rotatable holder  153 . The spherical surface  1551  facing the fixed base  151  has three contact points with the auxiliary balls  1561 , and the spherical surface  1551  and the auxiliary balls  1561  abut against each other at the three contact points. The spherical surface  1552  facing the rotatable holder  153  has four contact points with the pyramidal recess  1562 , and the spherical surface  1552  abuts against the pyramidal recess  1562  at the four contact points. 
     In this embodiment, the three auxiliary balls  1561  of the auxiliary supporting structure  156  include three convex surfaces, and the spherical surface  1551  of the spherical supporting structure  155  facing the fixed base  151  has three contact points with the three convex surfaces. 
     In this embodiment, the two spherical surfaces  1551  and  1552  of the spherical supporting structure  155  have a total of seven contact points with the auxiliary supporting structure  156 . 
     In this embodiment, the elastic element  152  surrounds the spherical supporting structure  155 , and the elastic element  152  provides a preload force to the rotatable holder  153  in a direction perpendicular to the reflecting surface  1541  and towards the fixed base  151 , such that the spherical supporting structure  155  supports the rotatable holder  153 . 
     The second printed circuit board  157  is disposed on the fixed base  151 . The image stabilizing actuator  158  includes four driving magnets  1581  and four driving coils  1582 . The driving coils  1582  are disposed on the second printed circuit board  157 , and the driving magnets  1581  are disposed on the rotatable holder  153 . The second printed circuit board  157  can provide driving current for the driving coils  1582 . The driving coils  1582  respectively face the driving magnets  1581  in a direction perpendicular to the reflecting surface  1541  so as to provide the rotatable holder  153  with at least two axial rotation driving forces and drive the rotatable holder  153  to rotate by taking the spherical supporting structure  155  as a rotation center, such that the reflecting element  154  can be rotated with the rotatable holder  153 . In addition, the rotatable holder  153  can pitch and yaw; that is, the rotatable holder  153  can rotate in pitch DP and yaw DY. 
     In this embodiment, the spherical supporting structure  155  is made of ferromagnetic material, such that the spherical supporting structure  155  can be attracted to the rotatable holder  153  by magnetic force. In addition, there is no relative displacement between the spherical supporting structure  155  and the fixed base  151 . 
     The two position sensing elements  159  are respectively disposed in two spaces respectively surrounded by adjacent two of the driving coils  1582 . The position sensing elements  159  and adjacent two of the driving magnets  1581  respectively face each other in a direction perpendicular to the reflecting surface  1541 , and the position sensing elements  159  are configured to detect a position of the rotatable holder  153 . 
     The first printed circuit board  16  is disposed on the frame body  12 . The auto focus driver unit  17  is disposed in the accommodating space SP, and at least a part of the auto focus driver unit  17  is disposed on the imaging lens module  13  so as to drive the imaging lens module  13  to move in a direction DA parallel to an optical axis OA thereof. Specifically, the auto focus driver unit  17  includes a plurality of rollable elements  171 , a focusing coil  172  and a focusing magnet  173 . The rollable elements  171  are rollably disposed in guiding grooves  121  of the frame body  12 , respectively, and clamped between the lens holder  132  and the frame body  12 . The focusing coil  172  is disposed on the first printed circuit board  16 , and the focusing magnet  173  is fixed to the lens holder  132 . The first printed circuit board  16  can provide driving current for the focusing coil  172 . The focusing coil  172  and the focusing magnet  173  face each other in a direction perpendicular to the optical axis OA. The focusing coil  172  and the focusing magnet  173  are configured to provide a driving force to move the imaging lens module  13 , and the imaging lens module  13  is movable in the direction DA parallel to the optical axis OA with the collaboration of the rollable elements  171 . 
     In this embodiment, the first printed circuit board  16  and the second printed circuit board  157  are two connected boards of a single printed circuit board, and the image stabilizing actuator  158  and the auto focus driver unit  17  are driven to work by the same printed circuit board, but the present disclosure is not limited thereto. 
     When a curvature radius of the spherical supporting structure  155  is R, and a minimum distance between the spherical supporting structure  155  and the reflecting surface  1541  is D, the following conditions are satisfied: R=0.45 mm; D=0.3 mm; and R/D=1.5. 
     2nd Embodiment 
     Please refer to  FIG. 8  to  FIG. 14 , where  FIG. 8  is a perspective view of a camera module according to the 2nd embodiment of the present disclosure,  FIG. 9  is a partially exploded view of the camera module in  FIG. 8 ,  FIG. 10  is an exploded view of some components of the camera module in  FIG. 8 ,  FIG. 11  is another exploded view of some components of the camera module in  FIG. 8 ,  FIG. 12  is a cross-sectional view of the camera module along line  12 - 12 ′ in  FIG. 8 ,  FIG. 13  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 10 , and  FIG. 14  is an enlarged view of region B of  FIG. 13 . 
     In this embodiment, a camera module  20  includes a casing  21 , a frame body  22 , an imaging lens module  23 , an image sensor  24 , a reflection module capable of image stabilization  25 , a printed circuit board  26  and an auto focus driver unit  27 . 
     The casing  21  is disposed on the frame body  22 , and the casing  21  and the frame body  22  together form an accommodating space SP. The casing  21  has an aperture  210  for light entering, and the frame body  22  has an opening  220  for light exiting. 
     The imaging lens module  23  is disposed in the accommodating space SP, and the imaging lens module  23  includes an imaging lens assembly  231  and a lens holder  232  for holding the imaging lens assembly  231 . In addition, the lens holder  232  is movably disposed in the accommodating space SP. 
     The image sensor  24  is disposed on an image surface  233  of the imaging lens module  23 , and the reflection module  25  is disposed in the accommodating space SP and located on an object side of the imaging lens module  23 . The reflection module  25  is configured to stabilize the image signal captured by the image sensor  24 . 
     The reflection module  25  includes a fixed base  251 , a plurality of elastic elements  252 , a rotatable holder  253 , a reflecting element  254 , a spherical supporting structure  255 , an auxiliary supporting structure  256  and an image stabilizing actuator  258 . 
     The fixed base  251  is disposed on the frame body  22 , and the rotatable holder  253  is connected to the fixed base  251  via the elastic elements  252 . 
     The reflecting element  254  is a plastic prism manufactured by injection molding, and the reflecting element  254  is disposed on the rotatable holder  253 . The reflecting element  254  and the fixed base  251  are located on two opposite sides of the rotatable holder  253 . The reflecting element  254  has a reflecting surface  2541 , a light entrance surface  2542  and a light exit surface  2543 . The reflecting surface  2541  is configured to fold an optical path of incident light. The light entrance surface  2542  is disposed corresponding to the reflecting surface  2541 , and the light exit surface  2543  is disposed corresponding to the reflecting surface  2541 . The light entrance surface  2542  faces toward the aperture  210  of the casing  21 , and the light exit surface  2543  faces toward the imaging lens module  23 . As such, incident light passes through, in order from the object side to the image side along the optical path, the light entrance surface  2542 , the reflecting surface  2541  and the light exit surface  2543 . 
     The spherical supporting structure  255  is a ball disposed between the rotatable holder  253  and the fixed base  251 . The auxiliary supporting structure  256  includes a first pyramidal recess  2563  and a second pyramidal recess  2562  corresponding and configured to support the spherical supporting structure  255 . The first pyramidal recess  2563  is recessed from a surface of the fixed base  251  facing the rotatable holder  253 , and the second pyramidal recess  2562  is recessed from a surface of the rotatable holder  253  facing the fixed base  251 . In this embodiment, the first pyramidal recess  2563  is a triangular based pyramidal recess having three lateral surfaces, and the second pyramidal recess  2562  is a square based pyramidal recess having four lateral surfaces. Furthermore, the spherical supporting structure  255  has two spherical surfaces  2551  and  2552  respectively facing the fixed base  251  and the rotatable holder  253 . The spherical surface  2551  facing the fixed base  251  has three contact points with the first pyramidal recess  2563 , and the spherical surface  2551  abuts against the first pyramidal recess  2563  at the three contact points. The spherical surface  2552  facing the rotatable holder  253  has four contact points with the second pyramidal recess  2562 , and the spherical surface  2552  abuts against the second pyramidal recess  2562  at the four contact points. 
     In this embodiment, the spherical surfaces  2551  and  2552  of the spherical supporting structure  255  have a total of seven contact points with the auxiliary supporting structure  256 . 
     In this embodiment, the number of the elastic elements  252  is four, and the elastic elements  252  together surround the spherical supporting structure  255 . The elastic elements  252  provides a preload force to the rotatable holder  253  in a direction perpendicular to the reflecting surface  2541  and towards the fixed base  251 , such that the spherical supporting structure  255  supports the rotatable holder  253 . 
     The image stabilizing actuator  258  includes four driving magnets  2581  and four driving coils  2582 . In this embodiment, the driving magnets  2581  are disposed on the fixed base  251 , and the driving coils  2582  are disposed on the rotatable holder  253 . The driving coils  2582  respectively face the driving magnets  2581  in a direction perpendicular to the reflecting surface  2541  so as to provide the rotatable holder  253  with at least two axial rotation driving forces and drive the rotatable holder  253  to rotate by taking the spherical supporting structure  255  as a rotation center, such that the reflecting element  254  can be rotated with the rotatable holder  253 . In addition, the rotatable holder  253  can pitch and yaw; that is, the rotatable holder  253  can rotate in pitch DP and yaw DY. 
     In this embodiment, the spherical supporting structure  255  is made of ferromagnetic material, such that the spherical supporting structure  255  can be attracted to the rotatable holder  253  and the fixed base  251  by magnetic force. In addition, there is no relative displacement between the spherical supporting structure  255  and the fixed base  251 . 
     The printed circuit board  26  is connected to the fixed base  251 . The auto focus driver unit  27  is disposed in the accommodating space SP, and at least a part of the auto focus driver unit  27  is disposed on the imaging lens module  23  so as to drive the imaging lens module  23  to move in a direction DA parallel to an optical axis OA thereof. Specifically, the auto focus driver unit  27  includes a plurality of rollable elements  271 , a focusing coil  272  and a focusing magnet  273 . The rollable elements  271  are rollably disposed in guiding grooves  221  of the frame body  22 , respectively, and clamped between the lens holder  232  and the frame body  22 . The focusing coil  272  is disposed on the printed circuit board  26 , and the focusing magnet  273  is fixed to the lens holder  232 . The printed circuit board  26  can provide driving current for the focusing coil  272 . The focusing coil  272  and the focusing magnet  273  face each other in a direction perpendicular to the optical axis OA. The focusing coil  272  and the focusing magnet  273  are configured to provide a driving force to move the imaging lens module  23 , and the imaging lens module  23  is movable in the direction DA parallel to the optical axis OA with the collaboration of the rollable elements  271 . 
     When a curvature radius of the spherical supporting structure  255  is R, and a minimum distance between the spherical supporting structure  255  and the reflecting surface  2541  is D, the following conditions are satisfied: R=0.6 mm; D=0.25 mm; and R/D=2.4. 
     3rd Embodiment 
     Please refer to  FIG. 15  to  FIG. 21 , where  FIG. 15  is a perspective view of a camera module according to the 3rd embodiment of the present disclosure,  FIG. 16  is a partially exploded view of the camera module in  FIG. 15 ,  FIG. 17  is an exploded view of some components of the camera module in  FIG. 15 ,  FIG. 18  is another exploded view of some components of the camera module in  FIG. 15 ,  FIG. 19  is a cross-sectional view of the camera module along line  19 - 19 ′ in  FIG. 15 ,  FIG. 20  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 17 , and  FIG. 21  is an enlarged view of region C of  FIG. 20 . 
     In this embodiment, a camera module  30  includes a casing  31 , a frame body  32 , an imaging lens module  33 , an image sensor  34 , a reflection module capable of image stabilization  35 , a first printed circuit board  36  and an auto focus driver unit  37 . 
     The casing  31  is disposed on the frame body  32 , and the casing  31  and the frame body  32  together form an accommodating space SP. The casing  31  has an aperture  310  for light entering, and the frame body  32  has an opening  320  for light exiting. 
     The imaging lens module  33  is disposed in the accommodating space SP, and the imaging lens module  33  includes an imaging lens assembly  331  and a lens holder  332  for holding the imaging lens assembly  331 . In addition, the lens holder  332  is movably disposed in the accommodating space SP. 
     The image sensor  34  is disposed on an image surface  333  of the imaging lens module  33 , and the reflection module  35  is disposed in the accommodating space SP and located on an object side of the imaging lens module  33 . The reflection module  35  is configured to stabilize the image signal captured by the image sensor  34 . 
     The reflection module  35  includes a fixed base  351 , an elastic element  352 , a rotatable holder  353 , a reflecting element  354 , a spherical supporting structure  355 , an auxiliary supporting structure  356 , a second printed circuit board  357 , an image stabilizing actuator  358  and two position sensing elements  359 . 
     The fixed base  351  is disposed on the frame body  32 , and the rotatable holder  353  is connected to the fixed base  351  via the elastic element  352 . 
     The reflecting element  354  is a plastic prism manufactured by injection molding, and the reflecting element  354  is disposed on the rotatable holder  353 . The reflecting element  354  and the fixed base  351  are located on two opposite sides of the rotatable holder  353 . The reflecting element  354  has a reflecting surface  3541 , a light entrance surface  3542  and a light exit surface  3543 . The reflecting surface  3541  is configured to fold an optical path of incident light. The light entrance surface  3542  is disposed corresponding to the reflecting surface  3541 , and the light exit surface  3543  is disposed corresponding to the reflecting surface  3541 . The light entrance surface  3542  faces toward the aperture  310  of the casing  31 , and the light exit surface  3543  faces toward the imaging lens module  33 . As such, incident light passes through, in order from the object side to the image side along the optical path, the light entrance surface  3542 , the reflecting surface  3541  and the light exit surface  3543 . In this embodiment, each of the light entrance surface  3542  and the light exit surface  3543  has an optical aspheric surface, such that the reflecting element  354  has light refractive power capable of providing better optical resolving power. 
     The spherical supporting structure  355  is a ball disposed between the rotatable holder  353  and the fixed base  351 . The auxiliary supporting structure  356  includes three spherical protrusions  3564  and a pyramidal recess  3562  corresponding and configured to support the spherical supporting structure  355 . The spherical protrusions  3564  are formed on a surface of the fixed base  351  facing the rotatable holder  353 , and the pyramidal recess  3562  is recessed from a surface of the rotatable holder  353  facing the fixed base  351 . In this embodiment, the pyramidal recess  3562  is a square based pyramidal recess having four lateral surfaces. Furthermore, the spherical supporting structure  355  has two spherical surfaces  3551  and  3552  respectively facing the fixed base  351  and the rotatable holder  353 . The spherical surface  3551  facing the fixed base  351  has three contact points with the spherical protrusions  3564 , and the spherical surface  3551  and the spherical protrusions  3564  abut against each other at the three contact points. The spherical surface  3552  facing the rotatable holder  353  has four contact points with the pyramidal recess  3562 , and the spherical surface  3552  abuts against the pyramidal recess  3562  at the four contact points. 
     In this embodiment, the three spherical protrusions  3564  of the auxiliary supporting structure  356  include three convex surfaces, and the spherical surface  3551  of the spherical supporting structure  355  facing the fixed base  351  has three contact points with the three convex surfaces. 
     In this embodiment, the two spherical surfaces  3551  and  3552  of the spherical supporting structure  355  have a total of seven contact points with the auxiliary supporting structure  356 . 
     In this embodiment, the elastic element  352  surrounds the spherical supporting structure  355 , and the elastic element  352  provides a preload force to the rotatable holder  353  in a direction perpendicular to the reflecting surface  3541  and towards the fixed base  351 , such that the spherical supporting structure  355  supports the rotatable holder  353 . 
     The second printed circuit board  357  is disposed on the fixed base  351 . The image stabilizing actuator  358  includes four driving magnets  3581  and four driving coils  3582 . The driving magnets  3581  are disposed on the rotatable holder  353 , and the driving coils  3582  are disposed on the second printed circuit board  357 . The second printed circuit board  357  can provide driving current for the driving coils  3582 . The driving coils  3582  respectively face the driving magnets  3581  in a direction perpendicular to the reflecting surface  3541  so as to provide the rotatable holder  353  with at least two axial rotation driving forces and drive the rotatable holder  353  to rotate by taking the spherical supporting structure  355  as a rotation center, such that the reflecting element  354  can be rotated with the rotatable holder  353 . In addition, the rotatable holder  353  can pitch and yaw; that is, the rotatable holder  353  can rotate in pitch DP and yaw DY. 
     In this embodiment, the spherical supporting structure  355  is made of ferromagnetic material, such that the spherical supporting structure  355  can be attracted to the rotatable holder  353  by magnetic force. In addition, there is no relative displacement between the spherical supporting structure  355  and the fixed base  351 . 
     The two position sensing elements  359  are respectively disposed in two spaces respectively surrounded by adjacent two of the driving coils  3582 . The position sensing elements  359  and adjacent two of the driving magnets  3581  respectively face each other in a direction perpendicular to the reflecting surface  3541 , and the position sensing elements  359  are configured to detect a position of the rotatable holder  353 . 
     The first printed circuit board  36  is disposed on the frame body  32 . The auto focus driver unit  37  is disposed in the accommodating space SP, and at least a part of the auto focus driver unit  37  is disposed on the imaging lens module  33  so as to drive the imaging lens module  33  to move in a direction DA parallel to an optical axis OA thereof. Specifically, the auto focus driver unit  37  includes a plurality of rollable elements  371 , a focusing coil  372  and a focusing magnet  373 . The rollable elements  371  are rollably disposed in guiding grooves  321  of the frame body  32 , respectively, and clamped between the lens holder  332  and the frame body  32 . The focusing coil  372  is disposed on the first printed circuit board  36 , and the focusing magnet  373  is fixed to the lens holder  332 . The first printed circuit board  36  can provide driving current for the focusing coil  372 . The focusing coil  372  and the focusing magnet  373  face each other in a direction perpendicular to the optical axis OA. The focusing coil  372  and the focusing magnet  373  are configured to provide a driving force to move the imaging lens module  33 , and the imaging lens module  33  is movable in the direction DA parallel to the optical axis OA with the collaboration of the rollable elements  371 . 
     In this embodiment, the reflecting element  354  further has an engagement structure  3544  surrounding a truncated conical surface of the reflecting surface  3541 . The reflecting element  354  is attached to the rotatable holder  353  by the engagement structure  3544  engaged with an engagement recess (not numbered) of the rotatable holder  353  so as to align the geometric center of the reflecting surface  3541  with the center of the spherical supporting structure  355 , which can further make the light exit surface  3543  of the reflecting element  354  coaxially aligned with the optical axis OA of the imaging lens module  33 . 
     In this embodiment, the first printed circuit board  36  and the second printed circuit board  357  are two connected boards of a single printed circuit board, and the image stabilizing actuator  358  and the auto focus driver unit  37  are driven to work by the same printed circuit board, but the present disclosure is not limited thereto. 
     When a curvature radius of the spherical supporting structure  355  is R, and a minimum distance between the spherical supporting structure  355  and the reflecting surface  3541  is D, the following conditions are satisfied: R=0.45 mm; D=0.3 mm; and R/D=1.5. 
     4th Embodiment 
     Please refer to  FIG. 22  to  FIG. 24 , where  FIG. 22  is a cross-sectional view of a camera module according to the 4th embodiment of the present disclosure,  FIG. 23  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 22 , and  FIG. 24  is an enlarged view of region D of  FIG. 23 . 
     In this embodiment, a camera module  40  is provided, and the camera module  40  has a configuration similar to that of the camera module  10  disclosed in the 1st embodiment. The camera module  40  and the camera module  10  are different from each other in features of spherical supporting structure and auxiliary supporting structure. 
     In this embodiment, a spherical supporting structure  455  includes two balls  4553  disposed between a rotatable holder  453  and a fixed base  451 . An auxiliary supporting structure  456  includes a pyramidal recess  4563  and two auxiliary balls  4561  corresponding and configured to support the spherical supporting structure  455 . The pyramidal recess  4563  is recessed from a surface of the fixed base  451  facing the rotatable holder  453 , and the auxiliary balls  4561  are disposed in an accommodation recess  4531  of the rotatable holder  453 . Each of the balls  4553  of the spherical supporting structure  455  has two spherical surfaces (not numbered) respectively facing the fixed base  451  and the rotatable holder  453 . Each spherical surface of the balls  4553  facing the fixed base  451  has three contact points with the pyramidal recess  4563 , and each spherical surface of the balls  4553  facing the fixed base  451  abuts against the pyramidal recess  4563  at the three contact points. Each spherical surface of the balls  4553  facing the rotatable holder  453  has two contact points with the auxiliary balls  4561 , and each spherical surface of the balls  4553  facing the rotatable holder  453  abuts against the auxiliary balls  4561  at the two contact points. 
     In this embodiment, the two auxiliary balls  4561  of the auxiliary supporting structure  456  include two convex surfaces, and each spherical surface of the balls  4553  of the spherical supporting structure  455  facing the rotatable holder  453  has two contact points with the two convex surfaces. Furthermore, the spherical supporting structure  455  has a total of ten contact points with the auxiliary supporting structure  456 . 
     In this embodiment, the rotatable holder  453  can pitch and yaw. Furthermore, the spherical supporting structure  455  is made of ferromagnetic material, such that the spherical supporting structure  455  can be attracted to the rotatable holder  453  by magnetic force. In addition, there is no relative displacement between the spherical supporting structure  455  and the fixed base  451 . 
     When a curvature radius of each of the balls  4553  of the spherical supporting structure  455  is R, and a minimum distance between the spherical supporting structure  455  and the reflecting surface  4541  is D, the following conditions are satisfied: R=0.4 mm; D=0.79 mm; and R/D=0.51. 
     5th Embodiment 
     Please refer to  FIG. 25 , which is a cross-sectional view of a camera module according to the 5th embodiment of the present disclosure. 
     In this embodiment, a camera module  50  is provided, and the camera module  50  has a configuration similar to that of the camera module  10  disclosed in the 1st embodiment. The camera module  50  and the camera module  10  are different from each other in features of spherical supporting structure and auxiliary supporting structure. 
     In this embodiment, a spherical supporting structure  555  is a spherical protrusion formed on a surface of a rotatable holder  553  facing a fixed base  551 . An auxiliary supporting structure  556  includes a pyramidal recess  5563  corresponding and configured to support the spherical supporting structure  555 . The pyramidal recess  5563  is recessed from a surface of the fixed base  551  facing the rotatable holder  553 . The pyramidal recess  5563  is a square based pyramidal recess having four lateral surfaces. Furthermore, the spherical supporting structure  555  includes a spherical surface  5551  facing the fixed base  551 , and the spherical surface  5551  has four contact points with the pyramidal recess  5563 , and the spherical surface  5551  and the pyramidal recess  5563  abut against each other at the four contact points. 
     In this embodiment, the rotatable holder  553  can pitch and yaw. In addition, there is no relative displacement between the spherical supporting structure  555  and the fixed base  551 . 
     In this embodiment, the spherical supporting structure  555  and the rotatable holder  553  are made in one piece, but the present disclosure is not limited thereto. Furthermore, in this embodiment, the spherical supporting structure  555  is formed on the rotatable holder  553 , and the pyramidal recess  5563  of the auxiliary supporting structure  556  is formed on the fixed base  551 , but the present disclosure is not limited thereto. In other embodiments, the protrusion-type spherical supporting structure is formed on the fixed base, the pyramidal recess of the auxiliary supporting structure is recessed from the rotatable holder, and the spherical supporting structure and the fixed base can be made in one piece. 
     When a curvature radius of the spherical supporting structure  555  is R, and a minimum distance between the spherical supporting structure  555  and the reflecting surface  5541  is D, the following conditions are satisfied: R=0.8 mm; D=0.62 mm; and R/D=1.29. 
     6th Embodiment 
     Please refer to  FIG. 26  to  FIG. 28 , where  FIG. 26  is a cross-sectional view of a camera module according to the 6th embodiment of the present disclosure,  FIG. 27  is a perspective view of a fixed base, a spherical supporting structure and an auxiliary supporting structure in  FIG. 26 , and  FIG. 28  is an enlarged view of region E of  FIG. 27 . 
     In this embodiment, a camera module  60  is provided, and the camera module  60  has a configuration similar to that of the camera module  10  disclosed in the 1st embodiment. The camera module  60  and the camera module  10  are different from each other in features of reflecting element, spherical supporting structure and auxiliary supporting structure. 
     In this embodiment, a reflecting element  654  is a reflection mirror disposed on a rotatable holder  653 , and the reflecting element  654  and a fixed base  651  are disposed on two opposite sides of the rotatable holder  653 . The reflecting element  654  has a reflecting surface  6541  configured to fold an optical path of incident light. 
     A spherical supporting structure  655  is a ball disposed between the rotatable holder  653  and the fixed base  651 . An auxiliary supporting structure  656  includes four auxiliary balls  6561  and a pyramidal recess  6562  corresponding and configured to support the spherical supporting structure  655 . The auxiliary balls  6561  are disposed in an accommodation recess  6511  of the fixed base  651 , and the pyramidal recess  6562  is recessed from a surface of the rotatable holder  653  facing the fixed base  651 . The pyramidal recess  6562  is a square based pyramidal recess having four lateral surfaces. Furthermore, the spherical supporting structure  655  has two spherical surfaces  6551  and  6552  respectively facing the fixed base  651  and the rotatable holder  653 . The spherical surface  6551  facing the fixed base  651  has four contact points with the auxiliary balls  6561 , and the spherical surface  6551  and the auxiliary balls  6561  abut against each other at the four contact points. The spherical surface  6552  facing the rotatable holder  653  has four contact points with the pyramidal recess  6562 , and the spherical surface  6552  abuts against the pyramidal recess  6562  at the four contact points. 
     In this embodiment, the four auxiliary balls  6561  of the auxiliary supporting structure  656  include four convex surfaces, and the spherical surface  6551  of the spherical supporting structure  655  facing the fixed base  651  has four contact points with the four convex surfaces. In addition, the spherical supporting structure  655  has a total of eight contact points with the auxiliary supporting structure  656 . 
     In this embodiment, the rotatable holder  653  can pitch and yaw. Furthermore, the spherical supporting structure  655  is made of ferromagnetic material, such that the spherical supporting structure  655  can be attracted to the rotatable holder  653  by magnetic force. In addition, there is no relative displacement between the spherical supporting structure  655  and the fixed base  651 . 
     When a curvature radius of the spherical supporting structure  655  is R, and a minimum distance between the spherical supporting structure  655  and the reflecting surface  6541  is D, the following conditions are satisfied: R=0.45 mm; D=0.45 mm; and R/D=1.0. 
     7th Embodiment 
     Please refer to  FIG. 29  and  FIG. 30 , where  FIG. 29  is one perspective view of an electronic device according to the 7th embodiment of the present disclosure, and  FIG. 30  is another perspective view of the electronic device in  FIG. 29 . 
     In this embodiment, an electronic device  7  is a smartphone including a plurality of camera modules, a flash module  71 , a focus assist module  72 , an image signal processor  73 , a display unit (a user interface)  74  and an image software processor. 
     The camera modules include an ultra-wide-angle camera module  70   a , a high pixel camera module  70   b  and a telephoto camera module  70   c . The camera module disclosed in the 1st embodiment is taken as the telephoto camera module  70   c , but the present disclosure is not limited thereto. Camera modules disclosed in other embodiments can also be taken as the telephoto camera module  70   c.    
     The image captured by the ultra-wide-angle camera module  70   a  enjoys a feature of multiple imaged objects.  FIG. 31  is an image captured by the ultra-wide-angle camera module  70   a.    
     The image captured by the high pixel camera module  70   b  enjoys a feature of high resolution and less distortion, and the high pixel camera module  70   b  can capture part of the image in  FIG. 31 .  FIG. 32  is an image captured by the high pixel camera module  70   b.    
     The image captured by the telephoto camera module  70   c  enjoys a feature of high optical magnification, and the telephoto camera module  70   c  can capture part of the image in  FIG. 32 .  FIG. 33  is an image captured by the telephoto camera module  70   c.  The maximum field of view (FOV) of the camera module corresponds to the field of view in  FIG. 33 . 
     When a user captures images of an object, the light rays converge in the ultra-wide-angle camera module  70   a,  the high pixel camera module  70   b  or the telephoto camera module  70   c  to generate an image(s), and the flash module  71  is activated for light supplement. The focus assist module  72  detects the object distance of the imaged object to achieve fast auto focusing. The image signal processor  73  is configured to optimize the captured image to improve image quality and provided zooming function. The light beam emitted from the focus assist module  72  can be either conventional infrared or laser. The display unit  74  can be a touch screen or a physical button. The user is able to interact with the display unit  74  and the image software processor having multiple functions to capture images and complete image processing. The image processed by the image software processor can be displayed on the display unit  74 . 
     8th Embodiment 
     Please refer to  FIG. 34 , which is one perspective view of an electronic device according to the 8th embodiment of the present disclosure. 
     In this embodiment, an electronic device  8  is a smartphone including the camera module  10  disclosed in the 1st embodiment, a camera module  80   a,  a camera module  80   b,  a camera module  80   c,  a camera module  80   d,  a camera module  80   e,  a camera module  80   f,  a camera module  80   g,  a camera module  80   h,  a flash module  81 , an image signal processor, a display unit and an image software processor (not shown). The camera module  10 , the camera module  80   a,  the camera module  80   b,  the camera module  80   c,  the camera module  80   d,  the camera module  80   e,  the camera module  80   f,  the camera module  80   g  and the camera module  80   h  are disposed on the same side of the electronic device  8 , while the display unit is disposed on the opposite side of the electronic device  8 . 
     The camera module  10  is a telephoto camera module, the camera module  80   a  is a telephoto camera module, the camera module  80   b  is a telephoto camera module, the camera module  80   c  is a telephoto camera module, the camera module  80   d  is a wide-angle camera module, the camera module  80   e  is a wide-angle camera module, the camera module  80   f  is an ultra-wide-angle camera module, the camera module  80   g  is an ultra-wide-angle camera module, and the camera module  80   h  is a ToF (time of flight) camera module. In this embodiment, the camera module  10 , the camera module  80   a,  the camera module  80   b,  the camera module  80   c,  the camera module  80   d,  the camera module  80   e,  the camera module  80   f  and the camera module  80   g  have different fields of view, such that the electronic device  8  can have various magnification ratios so as to meet the requirement of optical zoom functionality. In addition, the camera module  10  and the camera module  80   a  are telephoto camera modules having a light-folding element configuration. In addition, the camera module  80   h  can determine depth information of the imaged object. In this embodiment, the electronic device  8  includes multiple camera modules  10 ,  80   a,    80   b,    80   c,    80   d,    80   e,    80   f,    80   g,  and  80   h , but the present disclosure is not limited to the number and arrangement of camera module. When a user captures images of an object, the light rays converge in the camera modules  10 ,  80   a,    80   b,    80   c,    80   d,    80   e,    80   f,    80   g  or  80   h  to generate an image(s), and the flash module  81  is activated for light supplement. Further, the subsequent processes are performed in a manner similar to the abovementioned embodiments, so the details in this regard will not be provided again. 
     The smartphones in the embodiments are only exemplary for showing the camera modules  10 ,  20 ,  30 ,  40 ,  50 ,  60  of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. The camera modules  10 ,  20 ,  30 ,  40 ,  50 ,  60  can be optionally applied to optical systems with a movable focus. Furthermore, the camera modules  10 ,  20 ,  30 ,  40 ,  50 ,  60  feature good capability in aberration corrections and high image quality, and can be applied to 3D (three-dimensional) image capturing applications, in products such as digital cameras, mobile devices, digital tablets, smart televisions, network surveillance devices, dashboard cameras, vehicle backup cameras, multi-camera devices, image recognition systems, motion sensing input devices, wearable devices and other electronic imaging devices. 
     The foregoing description, for the purpose of explanation, has been described with reference to specific embodiments. It is to be noted that the present disclosure shows different data of the different embodiments; however, the data of the different embodiments are obtained from experiments. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical applications, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated. The embodiments depicted above and the appended drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings.