Patent Publication Number: US-2023142964-A1

Title: Lens module

Description:
FIELD OF THE PRESENT DISCLOSURE 
     The present invention relates to the technical field of optical devices, in particular to a lens module with image stabilization function. 
     DESCRIPTION OF RELATED ART 
     With the rapid development of electronic product camera systems, OIS (Optical Image Stabilization) is widely used in electronic equipment. OIS means that in a camera or other similar imaging instruments, the lens is set for example to avoid or reduce the jitter of the instrument in the process of capturing optical signals, thereby improving the imaging quality. It uses movable parts to compensate the light path where the hand shake occurs, so as to achieve the effect of reducing the blur of the photo. In layman&#39;s terms, the camera equipped with optical image stabilization is movable. When the camera shakes unavoidably due to human movement, the OIS optical anti-shake system will drive the moving camera back to its original position through various algorithms and methods to achieve the anti-shake effect. 
     In the prior art, for the traditional OIS type VCM (English name: Voice Coil Motor, Chinese name: Voice coil motor), the structure of spring sheet and suspending wire is often used to realize the jitter reset of the OIS part. For example, by connecting one end of the suspending wire to the spring leaf and the other end to the base of the voice coil motor, it is possible to provide elastic restoring force to the OIS part connected to the spring leaf. However, the spring leaf is an integral design, and one end of the integral spring leaf is set on the OIS part. The other end is set on the voice coil motor. The spring plate of this design easily leads to poor stability of jitter reset in the OIS system, and easily affects the performance of the OIS system. 
     Therefore, it is necessary to provide a new type of lens module to solve the technical problem of poor stability of the jitter reset of the OIS driving part in the prior art. 
     SUMMARY OF THE PRESENT INVENTION 
     One of the main objects of the present invention is to provide a lens module with improved image optical stabilization function. 
     To achieve the above-mentioned objects, the present invention provides a lens module, including: a lens assembly having an optical axis; a first bracket sleeved outside the lens assembly; a first elastic plate connecting the lens assembly and the first bracket for suspending the lens assembly in the first bracket; a second bracket opposed from the first bracket along the optical axis; a suspending wire respectively connecting the first bracket and the second bracket and suspending and supporting the first bracket; a driving assembly for driving the lens assembly to move along the optical axis relative to the first bracket, and for driving the lens assembly to move in a direction perpendicular to the optical axis. The second elastic plate is fixed on the second bracket, and includes a fixed part fixedly connected to the second bracket and a deformation part extending from the fixed part and fixedly connected to the suspending wire; the deformation part performs elastic deformation along the optical axis relative to the fixed part for reducing the bending force of the suspending wire. 
     In addition the lens module further includes an electric circuit for providing power support to the lens module, wherein the electric circuit includes: 
     a first inserted member embedded in the first bracket, and electrically connected to an end of the suspending wire connected to the first bracket; 
     a second inserted member embedded in the second bracket, and electrically connected to another end of the suspending wire connected to the second bracket; and 
     a circuit connector arranged on the first bracket and electrically connected with the first inserted member. 
     In addition, the lens assembly includes a lens and a lens holder; the first elastic plate includes an upper elastic plate and a lower elastic plate opposite to the upper elastic plate; the upper elastic plate locates on a side of the first bracket facing the second bracket with one end thereof connected to the first bracket and another end connected to the lens holder; the lower elastic plate locates on a side of the first bracket away from the second bracket with one end thereof connected to the first bracket and another end connected to the lens holder. 
     In addition, the upper elastic plate, the lower elastic plate and the lens are electrically connected; the upper elastic plate and the lower elastic plate are also electrically connected to the circuit connector and electrically connected to the electrical circuit through the circuit connector. 
     In addition, first bracket includes a first activity area for deforming the suspending wire; the second bracket includes a second activity area corresponding to the first activity area. 
     In addition, both an inner wall of the first activity area and an inner wall of the second activity area are provided with an inclined plane inclined from the suspending wire toward the optical axis; both the first activity area and the second activity area are filled with damping glue for wrapping the suspending wire; the damping glue is used for providing buffer to the suspending wire. 
     In addition, the driving assembly includes a first driving assembly that drives the lens assembly to move in a direction of an optical axis and a second driving assembly that drives a first bracket to move in a direction perpendicular to the optical axis; the first driving assembly includes a first coil wound on the outside of the lens assembly and a magnet arranged at a distance from the first coil, and the magnet is arranged on the first bracket; the second driving assembly includes a second coil fixed on the second bracket; the second coil is directly opposite to the magnet. 
     In addition, the lens module further includes a first position detection unit arranged in the first bracket for detecting the moving position of the lens assembly along the optical axis. 
     In addition, the lens module further includes a second position detection unit located below the first bracket for detecting the moving position of the lens assembly in a direction perpendicular to the optical axis. 
     In addition, the second elastic plate further includes a force arm connected between the fixed part and the deformation part for providing displacement support for the deformation part when the second elastic plate is deformed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the exemplary embodiments can be better understood with reference to the following drawings. The components in the drawing are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. 
         FIG.  1    is an isometric view of a lens module in accordance with an exemplary embodiment of the present invention. 
         FIG.  2    is a first exploded view of the lens module of the present invention. 
         FIG.  3    is an isometric view of a second bracket, suspending wire and elastic plate of the present invention. 
         FIG.  4    is an isometric view of the elastic plate of the present invention. 
         FIG.  5    is an isometric view of a first bracket, magnet, elastic component and lens assembly of the present invention. 
         FIG.  6    is a view shown from an aspect C in  FIG.  2   . 
         FIG.  7    is a second exploded view of the lens module of the present invention. 
         FIG.  8    is an isometric view of an electrical circuit of the lens module of the present invention. 
         FIG.  9    is another isometric view of the electrical circuit of the lens module of the present invention. 
         FIG.  10    is a cross-sectional view taken along line D-D in  FIG.  8   . 
     
    
    
     DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT 
     The present disclosure will hereinafter be described in detail with reference to an exemplary embodiment. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figures and the embodiment. It should be understood the specific embodiment described hereby is only to explain the disclosure, not intended to limit the disclosure. 
     Definitions: The first direction is the direction along the dashed line A-A in  FIG.  1   , and the second direction is the direction along the dashed line B-B in  FIG.  1   . The first bracket  3  and the second bracket  4  are arranged in a square shape. 
     As shown in  FIGS.  2  and  3   , a lens module  100  includes a base  1 , a lens assembly set on base  1   2 , a first bracket set outside lens assembly  2 , a first elastic plate  31  connected to lens assembly  2  and first bracket  3 , a second bracket  4  which is set apart from the first bracket  3 , suspending wires connected to the first bracket  3  and the second bracket  4  respectively and supports the first bracket  3 . Wherein, the lens assembly  2  has an optical axis, and the first bracket  3  and the second bracket  4  are arranged at intervals along the optical axis. The lens module  100  also includes a driving assembly. The driving assembly drives the lens assembly  2  relative to the first bracket  3  to move along the optical axis. The driving assembly also drives the first bracket  3  to drive the lens assembly  2  to move in a direction perpendicular to the optical axis. 
     The second elastic plate  41  is fixed on the second bracket  4 , as shown in  FIG.  3    and  FIG.  4   . The second elastic plate  41  includes a fixed part  411  fixedly connected to the second bracket  4  and a deformation part  412  extending from the fixed part  411  and fixedly connected to the suspending wire  5 . Compared with the fixed part  411 , the deformation part  412  can undergo elastic deformation along the optical axis to reduce the bending force of the suspending wire  5 . 
     Specifically, there are four second elastic plates  41 , and they are arranged symmetrically along the first direction and the second direction, respectively, so that the four second elastic plates  41  are diagonally disposed on the opposite corners of the second bracket  4 . By setting multiple relative suspending wire  5  between the first bracket  3  and the second bracket  4 , the second bracket  4  is more stable when suspended in the first bracket  3 . The second elastic plate  41  connected to the suspending wire  5  is installed at one end of the second bracket  4  of the suspending wire  5 . When the second bracket  4  moves along the optical axis relative to the first bracket  3 , the aforementioned deformation part  412  moves along the optical axis relative to the fixed part  411  and elastic deformation occurs. In order to reduce the bending force of the suspending wire  5 , the bending degree of the suspending wire  5  is reduced. To a certain extent, the stability of the second bracket  4  suspended on the first bracket  3  can be ensured, thereby effectively improving the anti-shake performance of the lens module  100 . 
     More specifically, as shown in  FIG.  4   , the fixed part  411  is connected to the second bracket  4 . The deformation part  412  is suspended on the second bracket  4  in the same plane as the fixed part  411 . The second elastic plate  41  also includes a force arm  413  connected between the fixed part  411  and the deformation part  412  to provide displacement support for the deformation part  412  when the deformation part  412  is deformed. Wherein, there are two force arm  413 , which respectively extend from the two ends of the deformation part  412  to the fixed part  411  and enclose to form a cavity  418 . Of course, the force arm  413 , deformation part  412  and fixed part  411  are all on the same plane, which facilitates the deformation of the second elasticity itself. Cavity  418  formed by the enclosed fixed part  411 , deformation part  412  and force arm  413  facilitates the deformation of the deformation part  412  when the suspending wire  5  deforms, and improves the elasticity of the suspending wire  5  when it deforms. And through the setting of force arm  413  and cavity  418 , suspending wire  5  is more convenient when driving the deformation of second elastic plate  41 . In turn, when the suspending wire  5  drives the deformation part  412  to move, the force arm  413  can quickly provide elastic support to the deformation part  412 . In turn, the suspending wire  5  is reduced in service life due to repeated excessive deformations. 
     As shown in  FIG.  4   , a bending part  4131  that is curved toward the cavity  418  and has a curvature is formed on the force arm  413 . Of course, the bending part  4131  can also be bent toward the outside of the cavity  418 . In this embodiment, in order to increase the space occupancy rate, the bending part  4131  is set in the cavity  418 . Its advantages are that it takes up less space for the lens module  100 , requires less materials, and has low production costs. It can be integrated with fixed part  411  and deformation part  412 . Through the setting of the bending part  4131 , the force arm  413  can provide a certain amount of elastic deformation when the deformation part  412  drives the force arm  413  to deform. Furthermore, the elastic deformation of the suspending wire  5  is realized, the bending force received by the suspending wire  5  is reduced, and the service life of the suspending wire  5  is effectively increased. 
     Specifically, one end of the force arm  413  is connected to the fixed part  411 , the other end is connected to the deformation part  412 , and the extension part is located between the two. And the bending part  4131  can be set in an arc shape, or in an S shape, of course, it can also be in a spiral shape, or a shape state that can provide a certain amount of deformation. 
     As shown in  FIGS.  2  and  3   , the second elastic plate  41  is embedded in the second bracket  4 , and the upper surface of the second elastic plate  41  is lower than the upper surface of the second bracket  4 . Set the second elastic plate  41  in the second bracket  4 . And the upper surface of the second elastic plate  41  is lower than the upper surface of the second bracket  4 , that is, the second elastic plate  41  is trapped in the second bracket  4 . In this way, it is difficult for the second elastic plate  41  to affect the movement of the second bracket  4  when it moves. 
     Specifically, the second bracket  4  is recessed with a sinking groove  414  for the second elastic plate  41  to be assembled. The sinking groove  414  is opened at the position corresponding to the second elastic plate  41 . The four sinking grooves  414  are arranged diagonally. The above setting is so that the second elastic plate  41  is completely built into the second bracket  4 . It is difficult for the second elastic plate  41  to affect the second bracket  4  when it is moved. 
     As shown in  FIG.  2    and  FIG.  3   , the number of the above-mentioned suspending wires  5  is four, and the two suspending wires  5  are arranged symmetrically along the first direction and the second direction, respectively. The four suspending wires  5  are arranged diagonally, so that the multiple suspending wires  5  are evenly arranged around the lens assembly  2 . In the same way, the second elastic plate  41  connected to the end of the suspending wire  5  is also arranged diagonally and evenly arranged around the lens assembly  2 . The purpose of the above arrangement is that the suspending wire  5  supports the uniform arrangement of the lateral restoring force of the second bracket  4 . In turn, the second bracket  4  is offset in any direction, and the restoring force is the same, which improves the anti-shake performance of the lens module  100 . 
     As shown in  FIG.  2   ,  FIG.  3   ,  FIG.  5    and  FIG.  6   , the first bracket  3  is provided with a first activity area  32  for the suspending wire  5  to deform. There is a second activity area  415  corresponding to the first activity area  32  on the second bracket  4 . Specifically, the first activity area  32  described above is recessed on the side facing the second bracket  4  at the opposite corner of the first bracket  3 . There are four first activity area  32  and set corresponding to suspending wire  5 . A first through hole  34  that penetrates the first bracket  3  is provided in the active area. The suspending wire  5  passes through the first through hole  34  through the first bracket  3  and is connected to the first inserted member  33  provided in the first bracket  3 . 
     The second activity area  415  described above is recessed on the side of the second bracket  4  facing the first bracket  3  at the opposite corner. There are four second activity area  415  and set corresponding to suspending wire  5 . There is a second through hole  419  through the second bracket  4  in the active area. The suspending wire  5  passes through the second through hole  419  through the second bracket  4  and is connected to the second inserted member  416  provided in the second bracket  4 . 
     More specifically, a first activity area  32  and a second activity area  415  are opened. When the second bracket  4  moves, the first activity area  32  and the second activity area  415  provide a certain moving space for the movement of the suspending wire  5 . Reduce the occurrence of damage caused by touching the first bracket  3  or second bracket  4  due to the movement of the suspending wire  5 . 
     Both the inner wall of the first activity area  32  and the inner wall of the second activity area  415  are provided with an inclined plane  6  inclined from the suspending wire  5  toward the optical axis. Set the inclined plane  6  on the inner wall of the first activity area  32  and the inner wall of the second activity area  415 . In order to provide a certain moving space for the suspending wire  5  when the suspending wire  5  is driven by the second bracket  4  and tilted. It also reduces the occurrence of damage caused by the movement of the suspending wire  5  due to touching the first bracket  3  or the second bracket  4 . In addition, the first activity area  32  and the second activity area  415  are filled with damping glue for wrapping the suspending wire  5  (not shown in the figure). Inclined plane  61  is set on the first activity area  32  and the second activity area  415  to increase the bonding area of the first bracket  3  and second bracket  4  and the damping glue to the greatest extent, enhancing the bonding strength of the damping glue and suppressing resonance. 
     As shown in  FIGS.  2 ,  6  and  8   , the driving assembly includes a first driving assembly that drives the lens assembly  2  to move in the direction of the optical axis and a second driving assembly that drives the first bracket  3  to move in the direction perpendicular to the optical axis. The first driving assembly includes a first coil  7  wound on the outside of the lens assembly  2  and a magnet  71  arranged opposite to the first coil  7  at an interval. The magnet  71  is set on the first bracket  3 . Wherein, the number of magnet  71  is four. The first bracket  3  is recessed with four assembly slots  316  for the magnet  71  to be inserted into. And the opening of the assembly slot  316  faces the second bracket  4 . In addition, the four assembly slots  316  are arranged symmetrically in the first direction and the second direction respectively in pairs, so that the four assembly slots  316  are arranged diagonally. Furthermore, the magnet  71  assembled in the assembly slot  316  is also arranged diagonally, so that the coils corresponding to the magnet  71  are also arranged diagonally. The magnet  71  cooperates with the first coil  7  to drive the lens assembly  2  to move along the optical axis. The first coil  7  is mainly used to provide different currents according to the offset of the lens assembly  2  to drive the movement of the lens assembly  2  relative to the first bracket  3  and change the position of the lens assembly  2 . The main principle is that the power-on first coil  7  interacts with the magnet  71 , and the first bracket  3  drives the lens assembly  2  in the first bracket  3  to move. Realize the jitter correction of the lens module  100  in the optical axis direction. 
     The second driving assembly includes a second coil  8  fixed on a second bracket  4 . The second coil  8  is set directly opposite to the magnet  71 . The magnet  71  cooperates with the second coil  8  to drive the lens assembly  2  to move in a direction perpendicular to the optical axis. The second coil  8  is mainly used to provide different currents according to the offset of the lens assembly  2  to drive the movement of the lens assembly  2  relative to the first bracket  3  and change the position of the lens assembly  2 . The main principle is that the second coil  8  and the magnet  71  interact with each other when energized. The first bracket  3  drives the lens assembly  2  in the first bracket  3  to move in the direction perpendicular to the optical axis, so as to realize the jitter correction of the lens module  100  in the direction perpendicular to the optical axis. 
     Wherein, referring to  FIG.  6   , the second bracket  4  is provided with a bump  417  protruding toward the first bracket  3 . A first circuit board  9  is clamped on the side of the second bracket  4  facing the first bracket  3 . The second coil  8  is connected to the bump  417  and electrically connected to the first circuit board  9 . The number of second coil  8  is four and is set in one-to-one correspondence with the magnet  71  described above. And the four second coils  8  are all ring-shaped. More specifically, the second coil  8  may have a racetrack shape, and the four second coils  8  have the same size. Using bump  417  to fix it can avoid the use of glue and other adhesives. The installation method is simple, which improves the product yield, and the second coil  8  has a better heat dissipation effect. 
     Specifically, both the first coil  7  and the second coil  8  are coils wound with enameled wire, and the coils can be directly exposed to the air. There is no need to use glue to wrap. When the coil is energized, the heat dissipation is better, and the ability to withstand large currents is stronger. 
     As shown in  FIGS.  8  and  9   , the lens module  100  also includes an electrical circuit (not marked in the figure) for providing power support to the lens module  100 . The electrical circuit includes a first inserted member  33  embedded in the first bracket  3 , a second inserted member  416  embedded in the second bracket  4 , and a circuit connector  10  connected to the first inserted member  33 . Wherein, one end of each suspending wire  5  connected to the first bracket  3  is connected with a first inserted member  33  through the second elastic plate  41 . One end connected to the second bracket  4  is connected with a second inserted member  416 . 
     As mentioned above, the first inserted member  33  and the second inserted member  416  are respectively set in the first bracket  3  and second bracket  4  to reduce the space occupied by the lens module  100  by the first inserted member  33  and the second inserted member  416  used for the transfer circuit. Further improve the integration of lens module  100 . In addition, in this embodiment, the first circuit board  9 , the first inserted member  33 , the second elastic plate  41 , the suspending wire  5  and the circuit connector  10  form an electrical circuit. And in this embodiment, all the above-mentioned elements can be used for conduction. Furthermore, the original parts in the lens module  100  are used to the greatest extent for functional expansion, so that the lens module  100  is electrically conductive without increasing the number of parts in the lens module  100 . 
     As shown in  FIGS.  2 ,  8  and  9   , the lens assembly  2  includes a lens  21  and a lens holder  22 . The first elastic plate  31  includes an upper elastic plate  311  and a lower elastic plate  312  that are relatively set. The upper elastic plate  311  is located on the side of the first bracket  3  facing the second bracket  4 . One end of the upper elastic plate  311  is connected to the first bracket  3 , and the other end is connected to the lens holder  22 . The lower elastic plate  312  is arranged on the side of the first bracket  3  away from the second bracket  4 , and one end of the lower elastic plate  312  is connected to the first bracket  3 , and the other end is connected to the lens holder  22 . There are four upper elastic plates  311 , and the four upper elastic plates  311  form a square configuration. There are also four lower elastic plate  312 , and the four lower elastic plate  312  are enclosed in a square configuration. Each of the above upper elastic plate  311  and lower elastic plate  312  includes a first end  313  fixed to the first bracket  3 , a second end  314  fixed to the lens holder  22 , and an elastic arm  315  connected to the first end  313  and the second end  314 . 
     As shown in  FIGS.  8 - 10   , the side wall of the lens holder  22  is recessed and formed with an annular groove  221  for fitting the first coil  7  wound on the lens holder  22 . The annular groove  221  is provided to reduce the volume of the assembly of the first coil  7  and the lens holder  22 . An upper winding column  222  is provided on the side of the lens holder  22  facing the second bracket  4 . A lower winding column  223  is provided on the side of the lens holder  22  facing the base  1 . Both upper winding column  222  and lower winding column  223  are set close to circuit connector  10 . 
     Wherein, an upper elastic plate  311  and a lower elastic plate  312  arranged close to the circuit connector  10  are electrically connected to the upper winding column  222  and the lower winding column  223 , respectively. The positive and negative poles of lens  21  are connected to upper winding column  222  and lower winding column  223  respectively. The power-on circuit of lens  21  is realized by circuit connector  10 , upper elastic plate  311 , lens  21  and lower elastic plate  312 . 
     As shown in  FIGS.  2 ,  8  and  10   , the lens module  100  also includes a first position detection unit set in the first bracket  3 . The first position detection unit is used to detect the moving position of lens assembly  2  along the optical axis. Wherein, the first detection unit includes a hall magnet  20  and a first hall sensor  201  embedded in the lens barrel bracket. The Hall magnet  20  is arranged between the first coil  7  and the lens holder  22  and is arranged directly opposite to the circuit connector  10 . The first hall sensor  201  is arranged on the side of the circuit connector  10  facing the lens holder  22 , and is arranged opposite to the Hall magnet  20 . The offset of the Hall magnet  20  is sensed by the first hall sensor  201 , so as to correct the jitter offset of the lens module  100  in the optical axis direction. 
     As shown in  FIG.  7   , the lens module  100  also includes a second position detection unit located under the first bracket  3 . The second position detection unit is used to detect the moving position of the lens assembly  2  along the direction perpendicular to the optical axis. Wherein, on the side of base  1  facing the first bracket  3 , a second circuit board  30  is provided. The second position detection unit includes a second hall sensor  40  corresponding to magnet  71 . The second hall sensor  40  is electrically connected to the second circuit board  30 . The offset of the magnet  71  is sensed by the second hall sensor  40  to correct the jitter offset of the lens module  100  perpendicular to the optical axis. 
     It is to be understood, however, that even though numerous characteristics and advantages of the present exemplary embodiment have been set forth in the foregoing description, together with details of the structures and functions of the embodiment, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms where the appended claims are expressed.