Patent Publication Number: US-2023164441-A1

Title: Anti-shake assembly and manufacturing method therefor, camera module with the anti-shake assembly

Description:
FIELD 
     The subject matter herein generally relates to camera module, especially to an anti-shake assembly with reduced size and manufacturing method therefore, and a camera module with the anti-shake assembly. 
     BACKGROUND 
     In general, a voice coil motor is required to be installed in a camera module to achieve anti-shake function of the camera module by timely adjusting the posture of the optical lens. 
     With various image capturing functions, electronic products such as mobile phones need to be equipped with many optical lenses, and a voice coil motor with higher power to adjust the positioned of multiple optical lenses. However, a high-power voice coil motor often requires more coil winding and a larger magnet, which is not conducive to the miniaturization requirement of the camera module. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Implementations of the present technology will now be described, by way of example only, with reference to the attached FIG.s. 
         FIG.  1    is a diagrammatic view of a copper-clad substrate according to a first embodiment of the present application. 
         FIG.  2    is a diagrammatic view of an inner flexible board according to the first embodiment of the present application. 
         FIG.  3    is a diagrammatic view of the inner flexible board illustrated in  FIG.  2    with a release film set. 
         FIG.  4    is a diagrammatic view of a second intermediate body of the first embodiment of the present application. 
         FIG.  5    is a diagrammatic view of the second intermediate body illustrated in  FIG.  4    with an outer circuit layer set. 
         FIG.  6    is a diagrammatic view of the second intermediate body illustrated in  FIG.  5    with a coil set. 
         FIG.  7    is a diagrammatic view of the second intermediate body illustrated in  FIG.  6   , with a corresponding outer rigid board being cut. 
         FIG.  8    is a diagrammatic view of the second intermediate body shown in  FIG.  7    after a release film is removed. 
         FIG.  9    is a top view of the second intermediate body shown in  FIG.  8   . 
         FIG.  10    is a diagrammatic view of a circuit board in the first embodiment of the present application. 
         FIG.  11    is a sectional view of the circuit board shown in  FIG.  10    along line X-X. 
         FIG.  12    is a diagrammatic view of an anti-shake assembly of the first embodiment of the present application. 
         FIG.  13    is a view of a camera module of the first embodiment of the present application. 
         FIG.  14    is a diagrammatic view of an anti-shake assembly according to a second embodiment of the present application. 
         FIG.  15    is a diagrammatic view of a camera module of the second embodiment of the present application. 
         FIG.  16    is a diagrammatic view of an anti-shake assembly according to a third embodiment of the present application. 
         FIG.  17    is a diagrammatic view of an anti-shake assembly according to a fourth embodiment of the present application. 
         FIG.  18    is a diagrammatic view of an inner base plate in the second embodiment of the present application. 
         FIG.  19    is a diagrammatic view of the inner base plate shown in  FIG.  18    with a first/second outer base plate set. 
         FIG.  20    is a diagrammatic view of a third rigid board of the second embodiment of the present application. 
         FIG.  21    is a diagrammatic view of the third rigid board shown in  FIG.  20    with an outer circuit layer set. 
         FIG.  22    is a diagrammatic view of the third rigid board shown in  FIG.  21    with a ball set. 
         FIG.  23    is a diagrammatic view of the third rigid board shown in  FIG.  22    with a second rigid board set. 
         FIG.  24    is a diagrammatic view of the third rigid board shown in  FIG.  23    connected with the second rigid board with flexible connecting wires. 
     
    
    
     DETAILED DESCRIPTION 
     It will be appreciated that for simplicity and clarity of illustration, where appropriate, reference numerals have been repeated among the different FIG.s to indicate corresponding or analogous elements. In addition, numerous specific details are set forth to provide a thorough understanding of the embodiments described herein. However, it will be understood by those of ordinary skill in the art that the embodiments described herein can be practiced without these specific details. In other instances, methods, procedures, and components have not been described in detail so as not to obscure the related relevant feature being described. Also, the description is not to be considered as limiting the scope of the embodiments described herein. The drawings are not necessarily to scale, and the proportions of certain parts may be exaggerated to better illustrate details and features of the present disclosure. 
     The term “comprising,” when utilized, means “including, but not necessarily limited to”; it specifically indicates open-ended inclusion or membership in the so-described combination, group, series, and the like. 
     Referring to  FIG.  12   , a first embodiment of the present disclosure provides an anti-shake assembly  10 . The anti-shake assembly  10  includes a circuit board  1 , a photosensitive chip  2 , and a magnetic member  3 . The circuit board  1  includes a first rigid board  11 , a second rigid board  12 , a plurality of flexible boards  13 , and a plurality of coils  14 . The first rigid board  11  defines a first accommodating space  111  therethrough, and the second rigid board  12  is disposed within the first accommodating space  111 . The flexible boards  13  are flexibly connected between the first rigid board  11  and the second rigid board  12 . The photosensitive chip  2  and the coils  14  are disposed on one side of the second rigid board  12 . The magnetic member  3  includes a base  31  and a plurality of magnets  32 . The base  31  includes a central plate  311  and two side plates  312 , and the side plates  312  are arranged around at a periphery of the central plate  311  to form a receiving space C. The magnets  32  are disposed on one side of the central plate  311  facing the receiving space C. The second rigid board  12  is received in the receiving space C. The magnets  32  corresponds to the coils  14  one by one. 
     Referring to  FIGS.  12  and  13   , when in use, if the photosensitive chip  2  is in a normal position (the normal position refers to the photosensitive chip  2  facing the lens assembly  501 ), the second rigid board  12  will provide power to all the coils  14 , and each powered coil  14  is subjected to a Lorentz force (not shown) in the magnetic field of the magnet  32 . The Lorentz forces acting on the coils  14  mutually cancel each other, and the second rigid board  12  is in a balanced stationary state under the traction of the flexible boards  13 . 
     If the photosensitive chip  2  is in an inclined position (the inclined position refers to the photosensitive chip  2  misaligned from the lens assembly  501 ), the second rigid board  12  will provide power to some of the coils  14 , and some powered coils  14  are subjected to an unbalanced Lorentz force in the magnetic field of the magnet  32 . This unbalanced Lorentz force can drive the second rigid board  12  to move within the plane of the first rigid board  11  to compensate for the inclination of the photosensitive chip  2 , so that the photosensitive chip  2  is in a normal position again. 
     With the above configuration, the coils  14  can generate Lorentz force that drive the rigid board  12  to move within a plane of the first rigid board  11 , thereby adjusting the posture of the photosensitive chip  20  and achieving an anti-shake function. This is advantageous in reducing the size of a camera module without the need for a large-sized voice coil motor to adjust the posture of the lens assembly. 
     In this embodiment, the anti-shake assembly  10  also includes a gyroscope (not shown) and a control chip (not shown). The gyroscope is provided on the rigid board  12 , and the control chip is provided on the first rigid board  11  or the rigid board  12 . The gyroscope is electrically connected to the control chip, and the control chip is electrically connected to the coils  14 . The gyroscope senses the posture information (e.g., normal attitude or inclined attitude) of the photosensitive chip  2 , and the control chip controls the energization state of the coil  14  based on the posture information. In the energization state, the coil  14  is subjected to Lorentz force in the magnetic field, which adjusts the position of the rigid board  12  and consequently adjusts the attitude of the photosensitive chip  2 . 
     Refer to  FIG.  11   , in this embodiment, the second rigid board  12  is divided into a central region A and an edge region B surrounding the central region A. The photosensitive chip  2  is disposed in the central region A, and the coils  14  are symmetrically disposed in the edge region B. 
     Refer to  FIG.  10   , in this embodiment, the flexible boards  13  are approximately “S”-shaped and is able to resists deformation. The flexible boards  13  are symmetrically disposed around a periphery of the second rigid board  12  and include a first end  131  and a second end  132  opposite the first end  131 . The first end  131  is electrically connected to the first rigid board  11 , and the second end  132  is electrically connected to the second rigid board  12 . In other embodiments, the flexible boards  13  can be replaced by other flexible connectors, such as connecting wire. 
     Refer to  FIG.  12   , in this embodiment, the anti-shake assembly  10  further includes a reinforcing plate  6  and a plurality of balls  7 . The reinforcing plate  6  is spaced apart from a side of the second rigid board  12  opposite the photosensitive chip  2 . The balls  7  are rollingly disposed between the reinforcement plate  6  and the second rigid board  12 , facilitating movement of the second rigid board  12  on the reinforcing plate  6 . The balls  7  support a portion weight of the second rigid board  12  and reduce friction between the second rigid board  12  and the reinforcing plate  6 . Further, the reinforcing plate  6  has a plurality of first receptacles  62 . Each ball  7  are partially received in a corresponding first receptacle  62  and is able to scroll in the first receptacle  62 . 
     Referring to  FIG.  1 - 11   , a manufacturing method for the anti-shake assembly  10  of the first embodiment of the present disclosure is also provided. The manufacturing method includes the following steps: 
     S 1 : Refer to  FIGS.  9  and  10   , a circuit board  1  is provided. The circuit board  1  includes a first rigid board  11 , a second rigid board  12 , a plurality of flexible boards  13 , and a plurality of coils  14 . The first rigid board  11  is provided with a first accommodating space  111 , and the second rigid board  12  is disposed in the first accommodating space  111 . The flexible boards  13  are flexibly connected between the first rigid board  11  and the second rigid board  12 , and the coils  14  are disposed on the second rigid board  12 . 
     Refer to  FIGS.  2 - 10   , in this embodiment, the manufacturing method for the circuit board  1  includes: 
     S 10 : Refer to  FIG.  2   , providing an inner flexible board  20 , which includes a core board  201  and cover films  22  disposed on opposite sides of the core board  201 . The core board  201  includes an insulating layer  23  and inner circuit layers  24  disposed on opposite sides of the insulating layer  23 . The cover films  22  include an adhesive layer  25  and a cover layer  26 , and the adhesive layer  25  is disposed between the inner circuit layers  24  and the cover layer  26 . In this embodiment, the materials of the insulating layer  23  and the cover layer  26  include Polyimide or Epoxy Resin. Along the thickness direction D of the inner flexible board  20 , the inner flexible board  20  is divided into a first area F, a second area S, and a connecting area L. The first area F is disposed around the second area S, and the connecting area L connects the first area F and the second area S. 
     In this embodiment, refer to  FIGS.  1  and  2   , the method for manufacturing the inner flexible board  20  in step S 10  includes: 
     S 101 : Refer to  FIG.  1   , a copper-clad substrate  33  is provided. The copper-clad substrate  33  includes the insulating layer  23 , the first copper foil layer  34 , and the second copper foil layer  35 . The first copper foil layer  34  and the second copper foil layer  35  are arranged on opposite sides of the insulating layer  23 . S 101 : Refer to  FIG.  2   , a first opening  36  is formed in the copper-clad substrate  33 , the first opening  36  extends through the second copper foil layer  35  and the insulating layer  23 . The bottom of the first copper foil layer  34  is exposed at the first opening  36 . 
     S 102 : Refer to  FIG.  2   , a first conductor body  331  is electroplated within the first opening  36 , the first conductor body  331  electrically conducts the first copper foil layer  34  and the second copper foil layer  35 . 
     S 103 : Refer to  FIG.  2   , the first copper foil layer  34  is etched to form the first inner circuit layer  241 , and the second copper foil layer  35  is etched to form the second inner circuit layer  242 . 
     S 104 : Refer to  FIG.  2   , a first adhesive layer  251  is formed on the first inner circuit layer  241 , and a second adhesive layer  252  is formed on the second inner circuit layer  242 . 
     S 105 : Refer to  FIG.  2   , a first cover layer  261  is formed on the first adhesive layer  251 , and a second cover layer  262  is formed on the second adhesive layer  252 , to obtain the inner flexible board  20 . 
     S 11 : Refer to  FIG.  3   , a release film  27  is placed on the cover film  22  corresponding to the connecting region L of the flexible board  20 . 
     S 12 : Refer to  FIGS.  4 ,  5  and  6   , an outer rigid board  60  is disposed on the inner flexible board  20 . The outer rigid board  60  includes a substrate layer  61 , an outer circuit layer  64 , a plurality of the coils  14 , and a soldering prevention layer  63 . The substrate layer  61  is disposed between the outer circuit layer  64  and the covering layer  26 , the coils  14  (refer to  FIG.  6   ) are disposed on one side of the outer circuit layer  64  away from the substrate layer  61 , and the soldering prevention layer  63  covers the outer circuit layer  64 . 
     In this embodiment, the step S 12  further includes: 
     S 120 : Refer to  FIG.  4   , a first outer rigid board  601  is pressed onto the first cover layer  261  and a second outer rigid board  602  is pressed onto the second cover layer  262  to obtain a second intermediate body  40 . The first outer rigid board  601  includes a first base layer  611  and a third copper foil layer  351  disposed on the first base layer  611 . The second outer rigid board  602  includes a second base layer  612  and a fourth copper foil layer  352  disposed on the second base layer  612 . The thickness D 1  of the third copper foil layer  351  or the thickness D 2  of the fourth copper foil layer  352  is greater than the thickness d 1  of the first copper foil layer  34  or the thickness d 2  of the second copper foil layer  35  (refer to  FIG.  1   ). 
     S 121 : Refer to  FIG.  5   , a second opening  361  and a third opening  362  are defined in the second intermediate body  40 . The second opening  361  penetrates the third copper foil layer  351 , the first base layer  611 , the first cover layer  261 , and the first adhesive layer  251  in sequence, and the bottom of the first inner circuit layer  241  is exposed at the bottom of the second opening  361 . The third opening  362  penetrates the fourth copper foil layer  352 , the second base layer  612 , the second cover layer  262 , and the second adhesive layer  252  in sequence, and the bottom of the second inner circuit layer  242  is exposed at the bottom of the third opening  362 . 
     S 122 : Refer to  FIG.  5   , a first electroplating layer  371  is electroplated on the third copper foil layer  351  and a second electroplating layer  372  is electroplated on the fourth copper foil layer  352 . Portion of the first electroplating layer  371  is filled into the second opening  361  to form a second conductor body  381 , which is electrically connected to the third copper foil layer  351  and the first adhesive layer  251 . Portion of the second electroplating layer  372  is filled into the third opening  362  to form a third conductor body  382 , which is electrically connected to the fourth copper foil layer  352  and the second inner circuit layer  242 . 
     S 123 : Refer to  FIG.  5   , the first electroplating layer  371  and the third copper foil layer  351  are etched to form a first outer circuit layer  641 , and the second electroplating layer  372  and the fourth copper foil layer  352  are etched to form a second outer circuit layer  642 . 
     S 124 : Refer to  FIG.  6   , a plurality of coils  14  is set on the first outer circuit layer  641 . 
     S 125 : Refer to  FIG.  6   , a first soldering prevention layer  631  is disposed on the first outer circuit layer  641  and a second soldering prevention layer  632  is disposed on the second outer circuit layer  642 . 
     S 13 : Refer to  FIG.  7   , a part of the outer rigid board  60  corresponding to the connection area L is removed. A part of the inner flexible board  20  is exposed in the connection area L. A part of the inner flexible board  20  corresponding to the first region F and a part of the outer rigid board  60  cooperatively form the first rigid board  11 , and a part of the inner flexible board  20  corresponding to the second region S and a part of the outer rigid board  60  cooperatively form the second rigid board  12 . 
     In this embodiment, refer to  FIGS.  7  and  8   , step S 13  includes the following steps: 
     S 130 : Refer to  FIG.  7   , the first soldering prevention layer  631 , the first outer circuit layer  641 , and the first base material layer  611  corresponding to the connection area L are laser-cut, and the second soldering prevention layer  632 , the second outer circuit layer  642 , and the second base material layer  612  corresponding to the connection area L are laser-cut. 
     S 131 : Refer to  FIGS.  8  and  9   , the release film  27  is peeled off to remove the first soldering prevention layer  631 , the first outer circuit layer  641 , and the first base layer  611  corresponding to the connection area L, and to remove the second soldering prevention layer  632 , the second outer circuit layer  642 , and the second base layer  612  corresponding to the connection area L. 
     S 14 : Refer to  FIG.  10   , the circuit board  1  is obtained by laser-cutting an exposed part of the inner flexible board  20  at the connection area L to form a plurality of flexible boards  13 . 
     S 2 : Refer to  FIG.  11   , a photosensitive chip  2  is set on the second rigid board  12 , and the photosensitive chip  2  is electrically connected to the second rigid board  12  through a metal wire M. 
     S 3 : Refer to  FIG.  12   , the second rigid board  12  is placed in the magnetic member  3 , and the coils  14  are corresponding to the magnets  32  respectively, to obtain the anti-shake assembly  10 . 
     Referring to  FIG.  13   , in this embodiment, a camera module  500  is also provided. The camera module  500  includes a lens assembly  501 , a filter  502 , and the anti-shake assembly  10 . A through hole  313  is formed through the central plate  311 , and the filter  502  is disposed on the through hole  313 . The lens assembly  501  is disposed on the central plate  311  and faces the through hole  313 , and the photosensitive chip  2  is also facing the through hole  313 . 
     Referring to  FIG.  14   , in the second embodiment of the present disclosure, an anti-shake assembly  50  is provided, which is different from the first rigid board  11  of the anti-shake assembly  10 . The anti-shake assembly  50  includes a third rigid board  15 . The third rigid board  15  is provided with a second accommodating space  16 . The second accommodating space  16  is not through the third rigid board  15 , and the second rigid board  12  can be disposed in the second accommodating space  16  in a movable manner. The second rigid board  12  is flexibly connected to the third rigid board  15  through a connecting wire  8 . 
     Referring to  FIG.  14   , in this embodiment, different from the balls  7  being disposed between the reinforcing plate  6  and the second rigid board  12  in the anti-shake assembly  10 , in the anti-shake assembly  50 , the balls  7  are disposed in the second accommodating space  16 , and the second rigid board  12  is disposed on the balls  7 . 
     Referring to  FIG.  14   , the bottom of the second accommodating space  16  is recessed to form a plurality of second receptacles  161 . The second receptacles  161  are roughly hemispherical, and a portion of each ball  7  can be accommodatively disposed in the second receptacles  161  in a rolling manner, and the second rigid board  12  is configured over the balls  7 . one portion of the balls  7  are confined to roll within the second receptacles  161 . The second rigid board  12  facing one side of the balls  7  is recessed to form a first limit slot  162 , while the other portion of each ball  7  can be movably accommodated in the first limit slot  162 . The second receptacles  161  and the first limit slot  162  together confine rolling direction of the balls  7 . 
     Referring to  FIG.  15   , a camera module  600  is also provided in the second embodiment of the present disclosure, which includes a lens assembly  501 , a filter  502 , and the anti-shake assembly  50  arranged in sequence. The central plate  311  has a through hole  313 , and the filter  502  is covered on the through hole  313 . The lens assembly  501  is set on the central plate  311  and faces the through hole  313 , and the photosensitive chip  2  faces the through hole  313 . 
     Referring to  FIG.  16   , in the third embodiment of the present disclosure, the difference from the second embodiment is that one side of the second rigid board  12  facing the ball  7  is recessed to form a plurality of third receptacles  163 , the third receptacles  163  are roughly hemispherical, and a portion of each ball  7  can be rolled and accommodated in the third receptacles  163 , the bottom of the second accommodating space  16  is concave to form a second limit slot  164 , and another portion of each ball  7  can be movably accommodated in the second limit slot  164 , the second limit slot  164  is used to limit the movement range of the second rigid board  12  in the second accommodating space  16 . 
     Referring to  FIG.  17   , in the fourth embodiment of the present disclosure, the difference from the second embodiment is that the second rigid board  12  is recessed to form a first limit groove  165 , the bottom of the second accommodation space  16  is recessed to form the second limit groove  164 , at least a part of the first limit groove  165  and the second limit groove  164  are oppositely arranged, a part of the ball  7  is accommodated in the first limit groove  165 , and the other part of the ball is accommodated in the second limit groove  164 . 
     Refer to  FIGS.  18  to  24   , the second embodiment of the present disclosure also provides a method for manufacturing the described anti-shake assembly  50 , including steps: 
     S 4 : Referring to  FIG.  20   , a third rigid board  15  is provided, which includes an inner base plate  151 , a first outer base plate  152 , and a second outer base plate  153 . The first outer base plate  152  and the second outer base plate  153  are set on opposite sides of the inner base plate  151 . The inner base plate  151  includes a dielectric layer  154 , a first inner conductor layer  155 , and a second inner conductor layer  156 , with the first inner conductor layer  155  and the second inner conductor layer  156  set on opposite sides of the dielectric layer  154 . The third rigid board  15  has the second accommodating space  16 , which passes through the first outer base plate  152  and the first inner conductor layer  155 , with the dielectric layer  154  exposed at the bottom of the second accommodating space  16 . 
     Referring to  FIGS.  18  to  20   , a manufacturing method of the third rigid board  15  in S 4  including steps: 
     S 40 : Referring to  FIG.  18   , a first inner conductive layer  155  is provided on the inner base plate  151 . An inner groove  17  is formed on the first inner conductive layer  155  and extends through the first inner conductive layer  155 . The dielectric layer  154  is exposed at the bottom of the inner groove  17 . 
     S 41 : Refer to  FIG.  19   , a third adhesive layer  158  is formed on the first inner conductive layer  155 . The first outer base plate  152  is then bonded to the third adhesive layer  158 . A fourth adhesive layer  157  is formed on the second inner conductive layer  156 , and the second outer base plate  153  is bonded to the fourth adhesive layer  157 . 
     S 42 : Referring to  FIG.  20   , a portion of the first outer base plate  152  corresponding to the inner groove  17  is removed by laser cutting to form the second accommodating space  16  and obtain the third rigid board  15 . 
     S 5 : Referring to  FIGS.  21  and  22   , the second receptacles  161  are formed on the exposed portion of the dielectric layer  154  at the bottom of the second accommodating space  16  by mechanical drilling, and the balls  7  are set in the second receptacles  161 . 
     S 6 : Referring to  FIGS.  23  and  24   , the second rigid board  12  is set on the balls  7 , and the third rigid board  15  and the second rigid board  12  are electrically connected through the connecting wire  8 . 
     S 7 : Referring to  FIG.  14   , the second rigid board  12  and the third rigid board  15  are accommodated in the magnetic member  3 , and the coils  14  correspond to the magnet  32  to obtain the anti-shake assembly  50 . 
     It is to be understood, even though information and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present embodiments, the disclosure is illustrative only; changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the plain meaning of the terms in which the appended claims are expressed.