Patent Publication Number: US-11665415-B2

Title: Camera module and electronic device

Description:
RELATED APPLICATIONS 
     This application is a continuation patent application of U.S. patent application Ser. No. 17/037,341, filed on Sep. 29, 2020, which is a continuation patent application of patent application of U.S. patent application Ser. No. 16/455,349, filed on Jun. 27, 2019, which claims priority to Taiwan Application 108116710, filed on May 15, 2019, which is incorporated by reference herein in its entirety. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a camera module and an electronic device, more particularly to 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. 
     The stray light generated inside the optical system has a significant impact on the imaging quality. Specifically, when there is strong light near the place where an imaged object is located, some unnecessary light generated by the strong light enters into the optical system and is received by an image sensor, thereby resulting in halo around the imaged object. One way to reduce stray light is to mount additional optical components with specific shape in a lens assembly to block stray light. However, the additional optical components may increase the overall size of the optical system such that it is unfavorable for compactness. 
     Accordingly, how to improve the optical system for achieving a compact size and blocking stray light 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 camera module includes a housing, a unitary element, an optical lens assembly, an image-side light blocking assembly and a driving device. The housing is configured to form a housing space. The unitary element is one-piece formed from a lens carrier and a lens barrel, and the unitary element is movably disposed in the housing space. The optical lens assembly is disposed in the unitary element. The image-side light blocking assembly is located on an image side of the optical lens assembly. The image-side light blocking assembly includes at least one light blocking sheet, and the image-side light blocking assembly does not contact the optical lens assembly. The driving device is disposed between the housing and the unitary element. The driving device includes a first driving member and a second driving member corresponding to each other. The first driving member is disposed on an element outer surface of the unitary element, and the second driving member is disposed in the housing space. There is no relative movement among the unitary element, the optical lens assembly and the image-side light blocking assembly. The driving device drives the unitary element, the optical lens assembly and the image-side light blocking assembly to move in an optical axis direction parallel to an optical axis of the optical lens assembly by electromagnetic force. A minimal inner opening of the unitary element is located between the optical lens assembly and the image-side light blocking assembly. A diameter of the minimal inner opening is smaller than an outer diameter of every lens element of the optical lens assembly, and the diameter of the minimal inner opening is also smaller than an outer diameter of every element of the image-side light blocking assembly. 
     According to another aspect of the present disclosure, an electronic device includes the aforementioned camera module and an image sensor. 
    
    
     
       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 side view of an electronic device according to the 1st embodiment of the present disclosure; 
         FIG.  2    is a cross-sectional view of the electronic device in  FIG.  1   ; 
         FIG.  3    is an exploded view of the electronic device in  FIG.  1   ; 
         FIG.  4    is an exploded view of a camera module in  FIG.  3   ; 
         FIG.  5    is a cross-sectional view of the camera module in  FIG.  3   ; 
         FIG.  6    is a schematic view of a light blocking sheet in  FIG.  5   ; 
         FIG.  7    is a cross-sectional view of an electronic device according to the 2nd embodiment of the present disclosure; 
         FIG.  8    is an exploded view of the electronic device in  FIG.  7   ; 
         FIG.  9    is an exploded view of a camera module in  FIG.  8   ; 
         FIG.  10    is a cross-sectional view of the camera module in  FIG.  8   ; 
         FIG.  11    is an exploded view of an electronic device according to the 3rd embodiment of the present disclosure; 
         FIG.  12    is a cross-sectional view of a camera module in  FIG.  11   ; 
         FIG.  13    is a perspective view of a retaining element of an image-side light blocking assembly in  FIG.  12   ; 
         FIG.  14    is an exploded view of an electronic device according to the 4th embodiment of the present disclosure; 
         FIG.  15    is an exploded view of a camera module in  FIG.  14   ; 
         FIG.  16    is a cross-sectional view of the camera module in  FIG.  14   ; 
         FIG.  17    is one perspective view of an electronic device according to the 5th embodiment of the present disclosure; 
         FIG.  18    is another perspective view of the electronic device in  FIG.  17   ; 
         FIG.  19    is an image captured by an ultra wide angle camera module; 
         FIG.  20    is an image captured by a high pixel camera module; and 
         FIG.  21    is an image captured by a telephoto camera module. 
     
    
    
     DETAILED DESCRIPTION 
     A camera module includes a housing, a unitary element, an optical lens assembly, an image-side light blocking assembly and a driving device. There is no relative movement among the unitary element, the optical lens assembly and the image-side light blocking assembly. 
     The housing is configured to form a housing space. The unitary element is one-piece formed from a lens carrier and a lens barrel, and the unitary element is movably disposed in the housing space. The optical lens assembly is disposed in the unitary element. Therefore, the unitary element is favorable for reducing the size of the camera module. 
     The image-side light blocking assembly is located on an image side of the optical lens assembly, and the image-side light blocking assembly does not contact the optical lens assembly. The image-side light blocking assembly includes at least one light blocking sheet. Therefore, the image-side light blocking assembly is favorable for improving the efficiency of blocking stray light; also, the image-side light blocking assembly is at a position with less influence on the arrangement of lens elements, such that it is favorable for reducing assembling deviation. 
     An automatic focusing function of the camera module is performed by the driving device. The driving device is disposed between the housing and the unitary element, and the driving device includes a first driving member and a second driving member. The first driving member is disposed on an element outer surface of the unitary element. The second driving member is disposed in the housing space and corresponds to the first driving member. The driving device drives the unitary element, the optical lens assembly and the image-side light blocking assembly to move in an optical axis direction parallel to an optical axis of the optical lens assembly by electromagnetic force. 
     The unitary element includes a minimal inner opening located between the optical lens assembly and the image-side light blocking assembly. The diameter of the minimal inner opening is smaller than the outer diameter of every lens element of the optical lens assembly, and the diameter of the minimal inner opening is also smaller than the outer diameter of every element of the image-side light blocking assembly. Therefore, the minimal inner opening working with the image-side light blocking assembly is favorable for preventing an image sensor from receiving stray light. 
     According to the present disclosure, the camera module can further include an image-side assembling member. The image-side assembling member is disposed on one side of the unitary element closer to the image side. The image-side assembling member includes a member inner surface and a member outer surface opposite to each other, the member inner surface surrounds the optical axis, and the member outer surface is farther away from the optical axis than the member inner surface. The unitary element can include a first contact surface. Either the member inner surface or the member outer surface of the image-side assembling member includes a second contact surface corresponding to the first contact surface, and the first contact surface contacts the second contact surface. Therefore, it is favorable for selecting a proper assembling method for mounting the image-side assembling member according to different specifications of the camera module, thereby improving assembling efficiency. 
     A plurality of stripe-shaped structures can be disposed on either the first contact surface of the unitary element or the second contact surface of the image-side assembling member. Each of the stripe-shaped structures is in a shape of strip and extends along the optical axis direction. Therefore, it is favorable for providing sufficient strength in order to stably assemble the unitary element with the image-side assembling member. 
     The image-side light blocking assembly can be accommodated in the image-side assembling member, and the image-side light blocking assembly contacts the image-side assembling member. Therefore, it is favorable for more freedom to adjust the configuration of image-side light blocking assembly according to different light shading requirements. 
     The image-side assembling member can non-overlap the first driving member in a direction orthogonal to the optical axis. Therefore, it is favorable for increasing manufacturing yield rate. 
     According to the present disclosure, the camera module can further include a light blocking unit disposed between the minimal inner opening of the unitary element and the image-side assembling member. An object-side surface of the light blocking unit is abutted with the unitary element, and an image-side surface of the light blocking unit is abutted with the image-side assembling member. Therefore, it is favorable for further improving the efficiency of blocking stray light. Moreover, since the light blocking unit is sandwiched between the unitary element and the image-side assembling member, the light blocking unit is prevented from warping. 
     The image-side light blocking assembly can be accommodated in the unitary element, and the image-side light blocking assembly contacts the unitary element. Therefore, it is favorable for efficient assembly. 
     The image-side light blocking assembly can include a retaining element, and the image-side light blocking assembly is positioned in the unitary element by the retaining element. Therefore, it is favorable for enhancing the structural stability. 
     The unitary element can include a third contact surface, and the retaining element can include a fourth contact surface corresponding to the third contact surface. The third contact surface contacts the fourth contact surface. A plurality of stripe-shaped structures can be disposed on either the third contact surface or the fourth contact surface. Each of the stripe-shaped structures is in a shape of strip and extends along the optical axis direction. Therefore, it is favorable for providing sufficient strength in order to stably assemble the unitary element with the image-side light blocking assembly. 
     According to the present disclosure, the first driving member and the second driving member of the driving device can be a combination of at least one coil and at least one magnet. Specifically, the first driving member includes a coil and the second driving member includes a magnet, or alternatively, the first driving member includes a magnet and the second driving member includes a coil. Therefore, the coil and the magnet jointly generate electromagnetic force (Lorentz force) so as to achieve automatic focusing. 
     The number of the magnet and the number of the coil are both two. The two magnets are disposed on opposite sides of the optical axis, and the two coils are also disposed on opposite sides of the optical axis. The unitary element, the two magnets and the two coils can be in a linear arrangement along a direction orthogonal to the optical axis. Therefore, it is favorable for reducing the height of the camera module so as to achieve compactness. 
     Herein, a first direction and a second direction are defined as two directions orthogonal to the optical axis direction, and the first direction is orthogonal to the second direction. When a length of the unitary element in the optical axis direction is A, a height of the unitary element in the first direction is B, and a width of the unitary element in the second direction is C, the following condition can be satisfied: 0.03&lt;(C−B)/A&lt;0.3. Therefore, with the requirement of reducing overall height of the camera module, it is a proper range of sizes for molding the unitary element. 
     At least a part of the optical lens assembly can non-overlap the unitary element in the first direction. Therefore, it is favorable for keeping the camera module compact. 
     Each light blocking sheet of the image-side light blocking assembly can include a non-circular opening. The non-circular opening includes a plurality of line section parts arranged along a circumferential direction of the optical axis, and the number of the line section parts is four or more. Therefore, it is favorable for reducing the probability of generating additional reflected light rays from a cross-section of the light blocking sheet. 
     According to the present disclosure, the image-side light blocking assembly includes at least three light blocking sheets. Therefore, it is favorable for improving the efficiency of blocking stray light. 
     According to the present disclosure, the camera module can further include a first optical path folding element. Herein, a first folding angle is defined as an angle formed between a first optical path and a second optical path, and the second optical path is parallel to the optical axis of the optical lens assembly. The first optical path folding element is disposed between the first optical path and the second optical path. Therefore, it is favorable for the camera module applicable to thin electronic devices. 
     According to the present disclosure, the camera module can further include a second optical path folding element. Herein, a second folding angle is defined as an angle formed between the second optical path and a third optical path. The second optical path folding element is disposed between the second optical path and the third optical path. Therefore, it is favorable for the camera module applicable to thin electronic devices. 
     The image-side light blocking assembly can include an image-side light blocking sheet closest to the image side. When an axial distance between the image-side light blocking sheet and the minimal inner opening of the unitary element is H1, and the diameter of the minimal inner opening is H2, the following condition can be satisfied: 0.05&lt;H1/H2&lt;0.90. Therefore, it is favorable for the image-side light blocking assembly having a wide light shading range for achieving high light shading efficiency. 
     When the number of lens elements of the optical lens assembly is N, the following condition can be satisfied: 4≤N≤10. Therefore, it is favorable for providing the camera module with high image resolution. 
     When a maximum field of view of the camera module is FOV, the following condition can be satisfied: 10 [deg.]&lt;FOV&lt;40 [deg.]. Therefore, it is favorable for providing the camera module with high magnification. 
     The optical lens assembly includes a plurality of lens elements. With respect to two of the lens elements that are adjacent to each other, one lens element is closer to an object side of the optical lens assembly, and the other lens element is closer to the image side of the optical lens assembly. A maximum outer diameter of the lens element, which is closer to the object side, can be larger than a maximum outer diameter of the lens element, which is closer to the image side. Therefore, it is favorable for a stable assembly of the lens elements so as to improve production efficiency and imaging quality. 
     According to the present disclosure, the housing of the camera module can include a first housing element, a second housing element and a third housing element. The first housing element is configured to accommodate the optical path folding element closer to the object side. The second housing element is configured to accommodate the unitary element. The third housing element is configured to accommodate the optical path folding element closer to the image side. The optical path folding element is, for example but not limited to, a prism, a reflective mirror or a beam splitter for reflection of light. 
     According to the present disclosure, the housing can further include a base configured to contact an image sensor, and the base can be assembled with the image sensor. The base is an optional element of the housing, and the present disclosure is not limited thereto. 
     According to the present disclosure, the image-side light blocking assembly can include a light blocking sheet, a spacing element and a retaining element, and the present disclosure is not limited thereto. 
     According to the present disclosure, the image-side assembling member can be made of black plastic material, and the image-side assembling member can be manufactured by injection molding. 
     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  FIG.  1    through  FIG.  4   .  FIG.  1    is a side view of an electronic device according to the 1st embodiment of the present disclosure.  FIG.  2    is a cross-sectional view of the electronic device in  FIG.  1   .  FIG.  3    is an exploded view of the electronic device in  FIG.  1   .  FIG.  4    is an exploded view of a camera module in  FIG.  3   . In this embodiment, an electronic device includes a camera module  1  and an image sensor IS. The camera module  1  includes a housing  10 , a unitary element  20 , an optical lens assembly  30 , an image-side assembling member  40 , an image-side light blocking assembly  50 , a driving device  60  and an optical path folding element  70 . 
     The housing  10  includes a first housing element  110  and a second housing element  120 . The second housing element  120  is configured to form a housing space  121 . 
     The unitary element  20  is one-piece formed from a lens carrier  210  and a lens barrel  220 . The unitary element  20  is movably disposed in the housing space  121  of the second housing element  120 . The unitary element  20  includes an element inner surface  211  and an element outer surface  212  opposite to each other. 
     The optical lens assembly  30  is disposed in the unitary element  20 , and the optical lens assembly  30  includes a plurality of lens elements  310 . The element inner surface  211  of the unitary element  20  surrounds the optical axis  320  of the optical lens assembly  30 , and the element outer surface  212  is farther away from the optical axis  320  than the element inner surface  211 . 
     The image-side assembling member  40  is disposed on the unitary element  20  and close to the image side. More specifically, the image-side assembling member  40  is disposed between the optical lens assembly  30  and the image sensor IS. The image-side assembling member  40  includes a member inner surface  410  and a member outer surface  420  opposite to each other. The member inner surface  410  surrounds the optical axis  320  of the optical lens assembly  30 , and the member outer surface  420  is farther away from the optical axis  320  than the member inner surface  410 . 
     The image-side light blocking assembly  50  is accommodated in the image-side assembling member  40 , and the image-side light blocking assembly  50  contacts the image-side assembling member  40 . The image-side light blocking assembly  50  includes at least one light blocking sheet  510  and at least one spacing element  520 . The light blocking sheet  510  is located on the image side of the optical lens assembly  30 , and the light blocking sheet  510  does not contact the optical lens assembly  30 . In this embodiment, the image-side light blocking assembly  50  includes a total of three light blocking sheets  510  and two spacing elements  520 . The light blocking sheets  510  and the spacing elements  520  are arranged in a staggered manner. 
     The driving device  60  is disposed between the housing  10  and the unitary element  20 . The driving device  60  includes a first driving member  610  and a second driving member  620 . The first driving member  610  is disposed on the element outer surface  212  of the unitary element  20 , the second driving member  620  is disposed on the second housing element  120  and corresponds to the first driving member  610 . In this embodiment, the first driving member  610  includes two coils respectively disposed on opposite sides of the optical axis  320 , and the second driving member  620  includes two magnets respectively disposed on opposite sides of the optical axis  320 . There is no relative movement among the unitary element  20 , the optical lens assembly  30  and the image-side light blocking assembly  50 . The electromagnetic force generated by the driving device  60  drives the unitary element  20 , the optical lens assembly  30  and the image-side light blocking assembly  50  to move in an optical axis direction D 0  parallel to the optical axis  320  of the optical lens assembly  30 . 
     The optical path folding element  70  is disposed in the first housing element  110  of the housing  10 . In detail, the optical path folding element  70  is disposed between a first optical path P 1  and a second optical path P 2 . The second optical path P 2  is parallel to the optical axis  320  of the optical lens assembly  30 , and the unitary element  20  is located on the second optical path P 2 . A first folding angle is formed between the first optical path P 1  and the second optical path P 2 . In this embodiment, the first optical path P 1  is perpendicular to the second optical path P 2 ; that is, the first folding angle is a right angle. 
     As shown in  FIG.  3   , a first direction D 1  and a second direction D 2  are defined as two directions orthogonal to the optical axis direction D 0 , wherein the first direction D 1  is orthogonal to the second direction D 2 . The image-side assembling member  40  non-overlaps the first driving member  610  of the driving device  60  in the second direction D 2 . The unitary element  20 , the first driving member  610  (coils) and the second driving member  620  (magnets) are in a linear arrangement along the second direction D 2 . 
     At least a part of the optical lens assembly  30  non-overlaps the unitary element  20  in the first direction D 1 . As shown in  FIG.  4   , an object-side portion  330  of the optical lens assembly  30  non-overlaps the unitary element  20  in the first direction D 1 . 
     Please refer to  FIG.  5   .  FIG.  5    is a cross-sectional view of the camera module in  FIG.  3   . A plane in  FIG.  3   , which is determined by the optical axis direction D 0  and the second direction D 2 , intersects with the camera module  1  and passes through the optical axis  320  so as to obtain the cross-sectional view in  FIG.  5   . The unitary element  20  further includes a minimal inner opening  213  located between the optical lens assembly  30  and the image-side light blocking assembly  50 . A diameter of the minimal inner opening  213  is smaller than an outer diameter of every lens element  310  of the optical lens assembly  30 ; also, the diameter of the minimal inner opening  213  is smaller than an outer diameter of every element (including the light blocking sheets  510  and the spacing elements  520 ) of the image-side light blocking assembly  50 . 
     As shown in  FIG.  3    and  FIG.  5   , when a length of the unitary element  20  in the optical axis direction D 0  is A, a height of the unitary element  20  in the first direction D 1  is B, and a width of the unitary element  20  in the second direction D 2  is C, the following condition is satisfied: (C−B)/A=0.09. 
     As shown in  FIG.  4    and  FIG.  5   , the element outer surface  212  of the unitary element  20  further includes a first contact surface  2121 , and the member inner surface  410  of the image-side assembling member  40  includes a second contact surface  411  corresponding to the first contact surface  2121 . The first contact surface  2121  contacts the second contact surface  411 . In other words, in this embodiment, the element outer surface  212  of the unitary element  20  is connected to the member inner surface  410  of the image-side assembling member  40 . Furthermore, a plurality of stripe-shaped structures  2121   a  are disposed on the first contact surface  2121  of the unitary element  20 . Each of the stripe-shaped structures  2121   a  is in a shape of strip and extends along the optical axis direction D 0 . 
     As shown in  FIG.  5   , with respect to the light blocking sheets  510  of the image-side light blocking assembly  50 , one of the light blocking sheets  510  (image-side light blocking sheet) is the closest to the image side. When an axial distance between the image-side light blocking sheet and the minimal inner opening  213  of the unitary element  20  is H1, and the diameter of the minimal inner opening  213  is H2, the following condition is satisfied: H1/H2=0.661. 
     As shown in  FIG.  5   , when the number of the lens elements  310  of the optical lens assembly  30  is N, the following condition is satisfied: N=5. 
     When a maximum field of view of the camera module  1  is FOV, the following condition is satisfied: FOV=21.8 degrees [deg.]. 
     As shown in  FIG.  5   , with respect to two of the lens elements  310  of the optical lens assembly  30  that are adjacent to each other, one lens element  310  is closer to the object side of the optical lens assembly  30 , and the other lens element  310  is closer to the image side of the optical lens assembly  30 . A maximum outer diameter of the lens element  310 , which is closer to the object side, is larger than a maximum outer diameter of the lens element  310 , which is closer to the image side. In other words, the lens elements  310  of the optical lens assembly  30  are arranged with their maximum outer diameters decreasing sequentially from the object side to the image side. The maximum outer diameter of the lens element  310  closest to the object side is the largest among the maximum outer diameters of all lens elements  310 , and the maximum outer diameter of the lens element  310  closest to the image side is the smallest among the maximum outer diameters of all lens elements  310 . 
     Please refer to  FIG.  6   .  FIG.  6    is a schematic view of a light blocking sheet in  FIG.  5   . Each light blocking sheet  510  of the image-side light blocking assembly  50  includes a non-circular opening  511 , and the non-circular opening  511  includes four line section parts  5111 . The line section parts  5111  are arranged along a circumferential direction of the optical axis  320 , and an arc corner  5112  is formed between each of adjacent line section parts  5111 . 
     2nd Embodiment 
     Please refer  FIG.  7    through  FIG.  9   .  FIG.  7    is a cross-sectional view of an electronic device according to the 2nd embodiment of the present disclosure.  FIG.  8    is an exploded view of the electronic device in  FIG.  7   .  FIG.  9    is an exploded view of a camera module in  FIG.  8   . In this embodiment, an electronic device includes a camera module  2  and an image sensor IS. The camera module  2  includes a housing  10 , a unitary element  20 , an optical lens assembly  30 , an image-side assembling member  40 , an image-side light blocking assembly  50 , a driving device  60 , a first optical path folding element  70   a  and a second optical path folding element  70   b.    
     The housing  10  includes a first housing element  110 , a second housing element  120  and a third  130 . The second housing element  120  is configured to form a housing space  121 . 
     The unitary element  20  is one-piece formed from a lens carrier  210  and a lens barrel  220 . The unitary element  20  is movably disposed in the housing space  121  of the second housing element  120 . The unitary element  20  includes an element inner surface  211  and an element outer surface  212  opposite to each other. 
     The optical lens assembly  30  is disposed in the unitary element  20 , and the optical lens assembly  30  includes a plurality of lens elements  310 . The element inner surface  211  of the unitary element  20  surrounds the optical axis  320  of the optical lens assembly  30 , and the element outer surface  212  is farther away from the optical axis  320  than the element inner surface  211 . 
     The image-side assembling member  40  is disposed on the unitary element  20  and close to the image side. The image-side assembling member  40  includes a member inner surface  410  and a member outer surface  420  opposite to each other. The member inner surface  410  surrounds the optical axis  320  of the optical lens assembly  30 , and the member outer surface  420  is farther away from the optical axis  320  than the member inner surface  410 . 
     The image-side light blocking assembly  50  is accommodated in the image-side assembling member  40 , and the image-side light blocking assembly  50  contacts the image-side assembling member  40 . The image-side light blocking assembly  50  includes at least one light blocking sheet  510  and at least one spacing element  520 . The light blocking sheet  510  is located on the image side of the optical lens assembly  30 , and the light blocking sheet  510  does not contact the optical lens assembly  30 . In this embodiment, the image-side light blocking assembly  50  includes a total of two light blocking sheets  510  and one spacing element  520 , and the two light blocking sheets  510  are spaced apart by the spacing element  520 . 
     The driving device  60  is disposed between the housing  10  and the unitary element  20 . The driving device  60  includes a first driving member  610  and a second driving member  620 . The first driving member  610  is disposed on the element outer surface  212  of the unitary element  20 , the second driving member  620  is disposed on the second housing element  120  and corresponds to the first driving member  610 . In this embodiment, the first driving member  610  includes two magnets respectively disposed on opposite sides of the optical axis  320 , and the second driving member  620  includes two coils respectively disposed on opposite sides of the optical axis  320 . There is no relative movement among the unitary element  20 , the optical lens assembly  30  and the image-side light blocking assembly  50 . The electromagnetic force generated by the driving device  60  drives the unitary element  20 , the optical lens assembly  30  and the image-side light blocking assembly  50  to move in an optical axis direction D 0  parallel to the optical axis  320  of the optical lens assembly  30 . 
     The first optical path folding element  70   a  is disposed in the first housing element  110  of the housing  10 . In detail, the first optical path folding element  70   a  is disposed between a first optical path P 1  and a second optical path P 2 . The second optical path P 2  is parallel to the optical axis  320  of the optical lens assembly  30 , and the unitary element  20  is located on the second optical path P 2 . A first folding angle is formed between the first optical path P 1  and the second optical path P 2 . In this embodiment, the first optical path P 1  is perpendicular to the second optical path P 2 ; that is, the first folding angle is a right angle. 
     The second optical path folding element  70   b  is disposed in the third housing element  130  of the housing  10 . In detail, the second optical path folding element  70   b  is disposed between the second optical path P 2  and a third optical path P 3 . A second folding angle is formed between the second optical path P 2  and the third optical path P 3 . In this embodiment, the second optical path P 2  is perpendicular to the third optical path P 3 ; that is, the second folding angle is a right angle. 
     As shown in  FIG.  8   , a first direction D 1  and a second direction D 2  are defined as two directions orthogonal to the optical axis direction D 0 , and the first direction D 1  is orthogonal to the second direction D 2 . The image-side assembling member  40  non-overlaps the first driving member  610  of the driving device  60  in the second direction D 2 . The unitary element  20 , the first driving member  610  (magnets) and the second driving member  620  (coils) are in a linear arrangement along the second direction D 2 . 
     At least a part of the optical lens assembly  30  non-overlaps the unitary element  20  in the first direction D 1 . As shown in  FIG.  9   , an object-side portion  330  of the optical lens assembly  30  non-overlaps the unitary element  20  in the first direction D 1 . 
     Please refer to  FIG.  10   , which is a cross-sectional view of the camera module in  FIG.  8   . A plane in  FIG.  8   , which is determined by the optical axis direction D 0  and the second direction D 2 , intersects with the camera module  2  and passes through the optical axis  320  so as to obtain the cross-sectional view in  FIG.  10   . The unitary element  20  further includes a minimal inner opening  213  located between the optical lens assembly  30  and the image-side light blocking assembly  50 . A diameter of the minimal inner opening  213  is smaller than an outer diameter of every lens element  310  of the optical lens assembly  30 ; also, the diameter of the minimal inner opening  213  is smaller than an outer diameter of every element (including the light blocking sheets  510  and the spacing element  520 ) of the image-side light blocking assembly  50 . 
     As shown in  FIG.  8    and  FIG.  10   , when a length of the unitary element  20  in the optical axis direction D 0  is A, a height of the unitary element  20  in the first direction D 1  is B, and a width of the unitary element  20  in the second direction D 2  is C, the following condition is satisfied: (C−B)/A=0.085. 
     As shown in  FIG.  9    and  FIG.  10   , in this embodiment, the camera module  2  further includes a light blocking unit  80 . The light blocking unit  80  is a light blocking sheet disposed between the minimal inner opening  213  of the unitary element  20  and the image-side assembling member  40 . An object-side surface  810  of the light blocking unit  80  is abutted with the unitary element  20 , and an image-side surface  820  of the light blocking unit  80  is abutted with the image-side assembling member  40 . The minimal inner opening  213  of the unitary element  20 , the light blocking unit  80  and the image-side assembling member  40  are arranged in order from the object side to the image side. 
     As shown in  FIG.  9    and  FIG.  10   , the element inner surface  211  of the unitary element  20  further includes a first contact surface  2111 , and the member outer surface  420  of the image-side assembling member  40  includes a second contact surface  421  corresponding to the first contact surface  2111 . The first contact surface  2111  contacts the second contact surface  421 . In other words, in this embodiment, the element inner surface  211  of the unitary element  20  is connected to the member outer surface  420  of the image-side assembling member  40 . Furthermore, a plurality of stripe-shaped structures  4211  are disposed on the second contact surface  421  of the image-side assembling member  40 . Each of the stripe-shaped structures  4211  is in a shape of strip and extends along the optical axis direction D 0 . 
     As shown in  FIG.  10   , with respect to the light blocking sheets  510  of the image-side light blocking assembly  50 , one of the light blocking sheets  510  (image-side light blocking sheet) is the closest to the image side. When an axial distance between the image-side light blocking sheet and the minimal inner opening  213  of the unitary element  20  is H1, and the diameter of the minimal inner opening  213  is H2, the following condition is satisfied: H1/H2=0.661. 
     As shown in  FIG.  10   , when the number of the lens elements  310  of the optical lens assembly  30  is N, the following condition is satisfied: N=5. 
     When a maximum field of view of the camera module  2  is FOV, the following condition is satisfied: FOV=21.8 [deg.]. 
     As shown in  FIG.  10   , with respect to two of the lens elements  310  of the optical lens assembly  30  that are adjacent to each other, one lens element  310  is closer to the object side of the optical lens assembly  30 , and the other lens element  310  is closer to the image side of the optical lens assembly  30 . A maximum outer diameter of the lens element  310 , which is closer to the object side, is larger than a maximum outer diameter of the lens element  310 , which is closer to the image side. In other words, the lens elements  310  of the optical lens assembly  30  are arranged with their maximum outer diameters decreasing sequentially from the object side to the image side. The maximum outer diameter of the lens element  310  closest to the object side is the largest among the maximum outer diameters of all lens elements  310 , and the maximum outer diameter of the lens element  310  closest to the image side is the smallest among the maximum outer diameters of all lens elements  310 . 
     3rd Embodiment 
     Please refer to  FIG.  11    through  FIG.  13   .  FIG.  11    is an exploded view of an electronic device according to the 3rd embodiment of the present disclosure.  FIG.  12    is a cross-sectional view of a camera module in  FIG.  11   .  FIG.  13    is a perspective view of a retaining element of an image-side light blocking assembly in  FIG.  12   . In this embodiment, an electronic device includes a camera module  3  and an image sensor IS. The camera module  3  includes a housing  10 , a unitary element  20 , an optical lens assembly  30 , an image-side light blocking assembly  50 , a driving device  60  and an optical path folding element  70 . 
     The unitary element  20  is one-piece formed from a lens carrier  210  and a lens barrel  220 . The unitary element  20  is movably disposed in the housing  10 . The unitary element  20  includes an element inner surface  211  and an element outer surface  212  opposite to each other. 
     The optical lens assembly  30  is disposed in the unitary element  20 , and the optical lens assembly  30  includes a plurality of lens elements  310 . The element inner surface  211  of the unitary element  20  surrounds the optical axis  320  of the optical lens assembly  30 , and the element outer surface  212  is farther away from the optical axis  320  than the element inner surface  211 . 
     The image-side light blocking assembly  50  is accommodated in the unitary element  20 , and the image-side light blocking assembly  50  contacts the unitary element  20 . The image-side light blocking assembly  50  includes at least one light blocking sheet  510  and at least one spacing element  520 . The light blocking sheet  510  is located on the image side of the optical lens assembly  30 , and the light blocking sheet  510  does not contact the optical lens assembly  30 . In this embodiment, the image-side light blocking assembly  50  includes a total of three light blocking sheets  510  and two spacing elements  520 . The light blocking sheets  510  and the spacing elements  520  are arranged in a staggered manner. 
     The driving device  60  is disposed between the housing  10  and the unitary element  20 . The driving device  60  includes a first driving member  610  and a second driving member  620 . The first driving member  610  is disposed on the element outer surface  212  of the unitary element  20 , the second driving member  620  is disposed in a housing space of the housing  10  and corresponds to the first driving member  610 . There is no relative movement among the unitary element  20 , the optical lens assembly  30  and the image-side light blocking assembly  50 . The electromagnetic force generated by the driving device  60  drives the unitary element  20 , the optical lens assembly  30  and the image-side light blocking assembly  50  to move in an optical axis direction D 0  parallel to the optical axis  320  of the optical lens assembly  30 . 
     The optical path folding element  70  is disposed in the housing  10 . In detail, the optical path folding element  70  is disposed between a first optical path P 1  and a second optical path P 2 . The second optical path P 2  is parallel to the optical axis  320  of the optical lens assembly  30 , and the unitary element  20  is located on the second optical path P 2 . A first folding angle is formed between the first optical path P 1  and the second optical path P 2 . In this embodiment, the first optical path P 1  is perpendicular to the second optical path P 2 ; that is, the first folding angle is a right angle. 
     In this embodiment, the image-side light blocking assembly  50  further includes a retaining element  530 , and the image-side light blocking assembly  50  is positioned in the unitary element  20  by the retaining element  530 . In detail, the element inner surface  211  of the unitary element  20  includes a third contact surface  2112 , and the retaining element  530  includes a fourth contact surface  531  corresponding to the third contact surface  2112 . The third contact surface  2112  contacts the fourth contact surface  531 . In other words, in this embodiment, the element inner surface  211  of the unitary element  20  is connected to the inner surface of the retaining element  530 . 
     As shown in  FIG.  13   , a plurality of stripe-shaped structures  5311  are disposed on the fourth contact surface  531  of the retaining element  530 . Each of the stripe-shaped structures  5311  is in a shape of strip and extends along the optical axis direction D 0 . 
     As shown in  FIG.  12   , the unitary element  20  further includes a minimal inner opening  213  located between the optical lens assembly  30  and the image-side light blocking assembly  50 . A diameter of the minimal inner opening  213  is smaller than an outer diameter of every lens element  310  of the optical lens assembly  30 ; also, the diameter of the minimal inner opening  213  is smaller than an outer diameter of every element (including the light blocking sheets  510  and the spacing elements  520 ) of the image-side light blocking assembly  50 . 
     As shown in  FIG.  11    and  FIG.  12   , a first direction D 1  and a second direction D 2  are defined as two directions orthogonal to the optical axis direction D 0 , and the first direction D 1  is orthogonal to the second direction D 2 . when a length of the unitary element  20  in the optical axis direction D 0  is A, a height of the unitary element  20  in the first direction D 1  is B, and a width of the unitary element  20  in the second direction D 2  is C, the following condition is satisfied: (C−B)/A=0.075. 
     At least a part of the optical lens assembly  30  non-overlaps the unitary element  20  in the first direction D 1 . As shown in  FIG.  11   , an object-side portion  330  of the optical lens assembly  30  non-overlaps the unitary element  20  in the first direction D 1 . 
     As shown in  FIG.  12   , with respect to the light blocking sheets  510  of the image-side light blocking assembly  50 , one of the light blocking sheets  510  (image-side light blocking sheet) is the closest to the image side. When an axial distance between the image-side light blocking sheet and the minimal inner opening  213  of the unitary element  20  is H1, and the diameter of the minimal inner opening  213  is H2, the following condition is satisfied: H1/H2=0.481. 
     As shown in  FIG.  12   , when the number of the lens elements  310  of the optical lens assembly  30  is N, the following condition is satisfied: N=5. 
     When a maximum field of view of the camera module  3  is FOV, the following condition is satisfied: FOV=21.8 [deg.]. 
     As shown in  FIG.  12   , with respect to two of the lens elements  310  of the optical lens assembly  30  that are adjacent to each other, one lens element  310  is closer to the object side of the optical lens assembly  30 , and the other lens element  310  is closer to the image side of the optical lens assembly  30 . A maximum outer diameter of the lens element  310 , which is closer to the object side, is larger than a maximum outer diameter of the lens element  310 , which is closer to the image side. In other words, the lens elements  310  of the optical lens assembly  30  are arranged with their maximum outer diameters decreasing sequentially from the object side to the image side. The maximum outer diameter of the lens element  310  closest to the object side is the largest among the maximum outer diameters of all lens elements  310 , and the maximum outer diameter of the lens element  310  closest to the image side is the smallest among the maximum outer diameters of all lens elements  310 . 
     4th Embodiment 
     Please refer to  FIG.  14    through  FIG.  16   .  FIG.  14    is an exploded view of an electronic device according to the 4th embodiment of the present disclosure.  FIG.  15    is an exploded view of a camera module in  FIG.  14   .  FIG.  16    is a cross-sectional view of the camera module in  FIG.  14   . In this embodiment, an electronic device includes a camera module  4  and an image sensor IS. The camera module  4  includes a housing  10 , a unitary element  20 , an optical lens assembly  30 , an image-side light blocking assembly  50 , a driving device  60 , a first optical path folding element  70   a  and a second optical path folding element  70   b.    
     The unitary element  20  is one-piece formed from a lens carrier  210  and a lens barrel  220 . The unitary element  20  is movably disposed in the housing  10 . The unitary element  20  includes an element inner surface  211  and an element outer surface  212  opposite to each other. 
     The optical lens assembly  30  is disposed in the unitary element  20 , and the optical lens assembly  30  includes a plurality of lens elements  310 . The element inner surface  211  of the unitary element  20  surrounds the optical axis  320  of the optical lens assembly  30 , and the element outer surface  212  is farther away from the optical axis  320  than the element inner surface  211 . 
     The image-side light blocking assembly  50  is accommodated in the unitary element  20 , and the image-side light blocking assembly  50  contacts the unitary element  20 . The image-side light blocking assembly  50  includes at least one light blocking sheet  510  located on the image side of the optical lens assembly  30 , and the light blocking sheet  510  does not contact the optical lens assembly  30 . In this embodiment, the image-side light blocking assembly  50  includes one single light blocking sheet  510 . 
     The driving device  60  is disposed between the housing  10  and the unitary element  20 . The driving device  60  includes a first driving member  610  and a second driving member  620 . The first driving member  610  is disposed on the element outer surface  212  of the unitary element  20 , the second driving member  620  is disposed in a housing space of the housing  10  and corresponds to the first driving member  610 . There is no relative movement among the unitary element  20 , the optical lens assembly  30  and the image-side light blocking assembly  50 . The electromagnetic force generated by the driving device  60  drives the unitary element  20 , the optical lens assembly  30  and the image-side light blocking assembly  50  to move in an optical axis direction D 0  parallel to the optical axis  320  of the optical lens assembly  30 . 
     The first optical path folding element  70   a  is disposed in the housing  10 . In detail, the first optical path folding element  70   a  is disposed between a first optical path P 1  and a second optical path P 2 . The second optical path P 2  is parallel to the optical axis  320  of the optical lens assembly  30 , and the unitary element  20  is located on the second optical path P 2 . A first folding angle is formed between the first optical path P 1  and the second optical path P 2 . In this embodiment, the first optical path P 1  is perpendicular to the second optical path P 2 ; that is, the first folding angle is a right angle. 
     The second optical path folding element  70   b  is disposed in the housing  10 . In detail, the second optical path folding element  70   b  is disposed between the second optical path P 2  and a third optical path P 3 . A second folding angle is formed between the second optical path P 2  and the third optical path P 3 . In this embodiment, the second optical path P 2  is perpendicular to the third optical path P 3 ; that is, second first folding angle is a right angle. 
     In this embodiment, the image-side light blocking assembly  50  further includes a retaining element  530 , and the image-side light blocking assembly  50  is positioned in the unitary element  20  by the retaining element  530 . In detail, the element inner surface  211  of the unitary element  20  includes a third contact surface  2112 , and the retaining element  530  includes a fourth contact surface  531  corresponding to the third contact surface  2112 . The third contact surface  2112  contacts the fourth contact surface  531 . In other words, in this embodiment, the element inner surface  211  of the unitary element  20  is connected to the inner surface of the retaining element  530 . 
     As shown in  FIG.  15   , a plurality of stripe-shaped structures  2112   a  are disposed on the third contact surface  2112  of the unitary element  20 . Each of the stripe-shaped structures  2112   a  is in a shape of strip and extends along the optical axis direction D 0 . 
     As shown in  FIG.  16   , the unitary element  20  further includes a minimal inner opening  213  located between the optical lens assembly  30  and the image-side light blocking assembly  50 . A diameter of the minimal inner opening  213  is smaller than an outer diameter of every lens element  310  of the optical lens assembly  30 ; also, the diameter of the minimal inner opening  213  is smaller than an outer diameter of every element (including the light blocking sheets  510  and the retaining element  530 ) of the image-side light blocking assembly  50 . 
     As shown in  FIG.  14    and  FIG.  16   , a first direction D 1  and a second direction D 2  are defined as two directions orthogonal to the optical axis direction D 0 , and the first direction D 1  is orthogonal to the second direction D 2 . When a length of the unitary element  20  in the optical axis direction D 0  is A, a height of the unitary element  20  in the first direction D 1  is B, and a width of the unitary element  20  in the second direction D 2  is C, the following condition is satisfied: (C−B)/A=0.085. 
     At least a part of the optical lens assembly  30  non-overlaps the unitary element  20  in the first direction D 1 . As shown in  FIG.  14   , an object-side portion  330  of the optical lens assembly  30  non-overlaps the unitary element  20  in the first direction D 1 . 
     As shown in  FIG.  16   , when an axial distance between the light blocking sheet  510  and the minimal inner opening  213  of the unitary element  20  is H1, and the diameter of the minimal inner opening  213  is H2, the following condition is satisfied: H1/H2=0.133. 
     As shown in  FIG.  16   , when the number of the lens elements  310  of the optical lens assembly  30  is N, the following condition is satisfied: N=5. 
     When a maximum field of view of the camera module  4  is FOV, the following condition is satisfied: FOV=21.8 [deg.]. 
     As shown in  FIG.  16   , with respect to two of the lens elements  310  of the optical lens assembly  30  that are adjacent to each other, one lens element  310  is closer to the object side of the optical lens assembly  30 , and the other lens element  310  is closer to the image side of the optical lens assembly  30 . A maximum outer diameter of the lens element  310 , which is closer to the object side, is larger than a maximum outer diameter of the lens element  310 , which is closer to the image side. In other words, the lens elements  310  of the optical lens assembly  30  are arranged with their maximum outer diameters decreasing sequentially from the object side to the image side. The maximum outer diameter of the lens element  310  closest to the object side is the largest among the maximum outer diameters of all lens elements  310 , and the maximum outer diameter of the lens element  310  closest to the image side is the smallest among the maximum outer diameters of all lens elements  310 . 
     5th Embodiment 
       FIG.  17    is one perspective view of an electronic device according to the 5th embodiment of the present disclosure.  FIG.  18    is another perspective view of the electronic device in  FIG.  17   . 
     In this embodiment, an electronic device  5  is a smartphone including a plurality of camera modules, a plurality of image sensors IS, a flash module  51 , a focus assist module  52 , an image signal processor  53 , a user interface  54  and an image software processor. 
     The camera modules include an ultra wide angle camera module  50   a , a high pixel camera module  50   b  and a telephoto camera module  50   c . The camera module  1  disclosed in the 1st embodiment is taken as the telephoto camera module  50   c . The image sensors IS are respectively disposed on the image surfaces of the ultra wide angle camera module  50   a , the high pixel camera module  50   b  and the telephoto camera module  50   c.    
     The image captured by the ultra wide angle camera module  50   a  enjoys a feature of multiple imaged objects.  FIG.  19    is an image captured by an ultra wide angle camera module. 
     The image captured by the high pixel camera module  50   b  enjoys a feature of high resolution and less distortion, and the high pixel camera module  50   b  can capture part of the image in  FIG.  19   .  FIG.  20    is an image captured by a high pixel camera module. 
     The image captured by the telephoto camera module  50   c  enjoys a feature of high optical magnification, and the telephoto camera module  50   c  can capture part of the image in  FIG.  20   .  FIG.  21    is an image captured by a telephoto camera module. The maximum field of view (FOV) of the camera module  1  corresponds to the field of view in  FIG.  21   . 
     When a user captures images of an object, the light rays converge in the camera module  1  to generate an image(s), and the flash module  51  is activated for light supplement. The focus assist module  52  detects the object distance of the imaged object to achieve fast auto focusing. The image signal processor  53  is configured to optimize the captured image to improve image quality. The light beam emitted from the focus assist module  52  can be either conventional infrared or laser. The user interface  54  can be a touch screen or a physical button. The user is able to interact with the user interface  54  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 user interface  54 . 
     The smartphone in this embodiment is only exemplary for showing the camera module  1  of the present disclosure installed in an electronic device, and the present disclosure is not limited thereto. The camera module  1  can be optionally applied to optical systems with a movable focus. Furthermore, the camera module  1  features 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.