Optical Element Driving Device, Imaging Device, and Mobile Terminal

Abstract

The present invention provides an optical element driving device, a camera device, and a mobile terminal. The optical element driving device includes: a housing; a base, the housing is covered on the base and a receiving space is formed between the housing and the base; a carrier, the carrier is movably arranged inside the receiving space; a driving component, the driving component is movably arranged on one side of the base facing the carrier; a lever piece component, the lever piece component has a plurality of movable arms that can swing along the Z-axis direction, the lever piece component is arranged between the carrier and the driving component, and the carrier abuts against the lever piece component; when the driving component is powered on, at least a part of the driving component moves relative to the base and drives the movable arm to swing along the Z-axis direction, so that the carrier moves along the Z-axis direction or deflects relative to the Z-axis. The present invention solves the problem of poor performance of the driving device of the camera device in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of imaging devices, and in particular, to an optical element driving device, an imaging device, and a mobile terminal. Background Art

[0002] In cameras or cameras, lenses with adjustable focal lengths or autofocus are usually adopted, and the adjustment process is to change the position of the lens or the image sensor. A driving motor is usually used to drive the lens and the image sensor to move. Currently, the autofocus of handheld imaging devices - especially the cameras of mobile phones - is basically all completed by a voice coil motor (VCM). The voice coil motor is a system composed of a coil and a magnet. After the coil is energized, it will be subjected to an electromagnetic force in the magnetic field. Due to the action of the electromagnetic force, the winding carrier moves linearly along the optical axis direction of the lens (i.e., the Z-axis). The winding carrier finally stops at the position point when the resultant force of the electromagnetic force generated between the annular coil and the driving magnet is balanced with the elastic forces of the upper spring and the lower spring.

[0003] Although the voice coil motor has the advantages of mature technology, low cost, and low noise, with the increasing requirements for imaging of imaging devices, the voice coil motor has problems such as magnetic interference, insufficient thrust, and unstable structure and performance. For example: Dual camera motors have been developed and applied to various mid- to high-end mobile phones, but there are certain difficulties in actual use. In particular, there is a certain degree of magnetic interference between the two dual camera motors, which affects the normal performance of the dual camera motors. The voice coil motor cannot avoid this defect. At the same time, various improvement schemes are likely to make the motor structure complex and increase the assembly process difficulty; the electrical conduction and connection assembly between the various components in the voice coil motor are all achieved through methods such as welding, thermal riveting, and dispensing. At the same time, the coil needs to be energized through the upper / lower springs, resulting in a long path for the coil to be energized. Since the number of components in the voice coil motor is large, there are many places for welding, thermal riveting, and dispensing. When the mobile phone is once subjected to external forces such as dropping and impact, the motor is prone to phenomena such as the pulling off of internal welding points or dispensing points or spring deformation due to external vibration. Eventually, the electrical performance and combined structure inside the motor are damaged, affecting the normal performance of the motor and bringing adverse consequences to the shooting effect.

[0004] Therefore, there is a problem of poor performance of the driving device of the imaging device in the prior art. Summary of the Invention

[0005] The main object of the present invention is to provide an optical element driving device, an imaging device, and a mobile terminal to solve the problem of poor performance of the driving device of the imaging device in the prior art.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided an optical element driving device, including: a housing; a base, the housing is sleeved on the base and a receiving space is formed between the housing and the base; a carrier seat, the carrier seat is movably arranged inside the receiving space; a driving component, the driving component is movably arranged on one side of the base facing the carrier seat; a lever piece component, the lever piece component has a plurality of movable arms that can swing along the Z-axis direction, the lever piece component is arranged between the carrier seat and the driving component, and the carrier seat abuts against the lever piece component; when the driving component is powered on, at least a part of the driving component moves relative to the base and drives the movable arm to swing along the Z-axis direction, so that the carrier seat moves along the Z-axis direction or deflects relative to the Z-axis.

[0007] Further, the driving component includes: a driving structure, the driving structure has a plurality of fixed ends and a plurality of movable ends, and the plurality of fixed ends are respectively fixedly connected to the base; a plurality of SMA wires, the SMA wires are multiple, one end of the SMA wire is connected to the fixed end, the other end of the SMA wire is connected to the movable end, and the SMA wire is electrically connected to the driving structure. When the SMA wire is powered on, the SMA wire contracts and drives the movable end to move in a direction away from the base, and the movable end presses the movable arm of the lever piece component, and the movable arm drives the carrier seat to move.

[0008] Further, the driving structure includes: an FPC board, the FPC board is fixedly connected to the base, the FPC board has a fixed end, and the FPC board is electrically connected to the SMA wire; a plurality of elastic pieces, each movable arm corresponds to at least one elastic piece, the elastic piece is movably arranged on the side of the FPC board away from the base, one end of the elastic piece is fixedly connected to the FPC board, and the other end of the elastic piece is a movable end and can move relative to the FPC board.

[0009] Further, the driving structure includes an FPC board, the FPC board is electrically connected to the SMA wire, the FPC board has a plurality of driving arms, the plurality of driving arms respectively correspond to the plurality of movable arms one by one, and the driving arms respectively have a fixed end and a movable end.

[0010] Further, the driving structure further includes a plurality of elastic pieces, the plurality of elastic pieces respectively correspond to the plurality of driving arms one by one, and the elastic pieces are arranged on the side of the driving arm close to the base.

[0011] Further, there is an activity gap between the elastic piece and the end of the driving arm with the fixed end.

[0012] Further, the driving component further includes a plurality of claws, and both ends of the SMA wire are respectively connected to the fixed end and the movable end through the claws.

[0013] Further, the driving component further includes a plurality of pressing members, at least one pressing member is respectively arranged on the side of each movable end facing the movable arm, and the pressing member abuts against the movable arm.

[0014] Further, the pressing member is a ball, the movable end has a receiving groove, and at least a part of the ball is movably disposed in the receiving groove; or the ball is fixedly disposed on the movable end.

[0015] Further, there are multiple SMA wires, and the multiple SMA wires, multiple movable arms, multiple fixed ends, and multiple movable ends correspond one by one, and different SMA wires respectively correspond to different fixed ends and different movable ends.

[0016] Further, there are four SMA wires, four movable arms, four fixed ends, and four movable ends. The four movable arms are arranged in two pairs parallel to each other, and two mutually parallel movable arms are perpendicular to the other two mutually parallel movable arms; and / or among the four SMA wires, the mutually approaching ends of two adjacent SMA wires are respectively connected to the movable end and the fixed end.

[0017] Further, the driving assembly includes: an FPC board, which is fixedly connected to the base. The FPC board has a fixed end and is electrically connected to the SMA wire; multiple piezoelectric ceramic sheets, each movable arm respectively corresponds to at least one piezoelectric ceramic sheet. The piezoelectric ceramic sheets are movably disposed on the side of the FPC board away from the base. One end of the piezoelectric ceramic sheet is fixedly connected to the FPC board, and the other end of the piezoelectric ceramic sheet is a movable end and can move relative to the FPC board.

[0018] Further, the lever sheet assembly includes a frame. The corners of the frame are respectively connected to the base, and multiple movable arms are respectively connected to the inner edge of the frame.

[0019] Further, the first end of the movable arm is connected to the frame, the second end of the movable arm can swing along the Z axis, and the mutually approaching ends of two adjacent movable arms are respectively the first end and the second end.

[0020] Further, each corner of the base respectively has at least one positioning post extending towards the carrier seat. The positioning post has a lapping surface, and the corner of the frame laps on the lapping surface.

[0021] Further, a guiding protrusion extending towards the carrier seat is provided on the lapping surface. The frame and the carrier seat respectively have avoidance notches for avoiding the guiding protrusion; and / or the circumferential side wall of the positioning post has a positioning surface facing the driving assembly.

[0022] Further, the optical element driving device further includes a pressing piece. The pressing piece is disposed on the side of the carrier seat away from the driving assembly and is connected to the positioning post to provide a restoring force for the carrier seat to move towards the driving assembly.

[0023] Further, the circumferential side wall of the housing has an avoidance notch for avoiding the FPC board of the driving assembly.

[0024] According to another aspect of the present invention, there is provided an imaging device, which includes the above-described optical element driving device.

[0025] According to another aspect of the present invention, there is provided a mobile terminal, which includes the above-described imaging device.

[0026] Applying the technical solution of the present invention, the optical element driving device in the present application includes a housing, a base, a carrier, a driving component, and a lever piece assembly. The housing covers the base and forms an accommodation space therebetween; the carrier is movably disposed inside the accommodation space; the driving component is movably disposed on one side of the base facing the carrier; the lever piece assembly has a plurality of movable arms capable of swinging in the Z-axis direction, the lever piece assembly is disposed between the carrier and the driving component, and the carrier abuts against the lever piece assembly; when the driving component is powered on, at least a part of the driving component moves relative to the base and drives the movable arms to swing in the Z-axis direction, so that the carrier moves in the Z-axis direction or deflects relative to the Z-axis.

[0027] When using the optical element driving device in the present application, the optical element in the imaging module is installed on the carrier. Since the lever piece assembly has a plurality of movable arms capable of swinging in the Z-axis direction, the carrier can be driven to move by the swinging of the plurality of movable arms, so that the carrier can move in the Z-axis direction or deflect relative to the Z-axis direction, thereby realizing the autofocus function or the anti-shake function. The swinging of the movable arms is realized by the movement of the driving component relative to the base. When the deformation amounts of the plurality of movable arms are the same, the plurality of movable arms can drive the carrier to move in the Z-axis direction and realize AF driving. When the deformation amounts of the plurality of movable arms are different, the shift anti-shake function of the optical element can be realized. That is to say, in the present application, the lever piece assembly and the driving component of the optical element driving device replace the driving coil, the driving magnet part, and the suspension wire anti-shake part in the original voice coil motor. And, since the present application no longer requires structures such as springs that cooperate with the driving magnet and the driving coil, the optical element driving device in the present application has a simpler structure than the existing voice coil motor. At the same time, there is no magnet, so there will be no internal or external magnetic interference problems. And, the optical element driving device in the present application has no magnetic circuit design problem, and the average thrust of the entire stroke force is larger than that of the electromagnetic method, so it is more efficient than the existing voice coil motor. And, without the upper and lower spring designs of the voice coil motor, there will be no problems such as spring deformation, nickel or foreign object shedding in the drop and drum tests. Therefore, the optical element driving device in the present application effectively solves the problem of poor performance of the driving device of the imaging device in the prior art. Description of the Drawings

[0028] The accompanying drawings of the specification, which form a part of the present application, are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 shows a schematic structural diagram of an optical element driving device according to a specific embodiment of the present invention;

[0030] Figure 2 shows Figure 1 an exploded view of the optical element driving device in

[0031] Figure 3 shows Figure 1 a schematic diagram of the positional relationship among the carrier base, the lever piece assembly, and the extrusion piece of the optical element driving device in

[0032] Figure 4 shows Figure 2 a schematic structural diagram of the lever piece assembly of the optical element driving device in

[0033] Figure 5 shows Figure 1 a schematic structural diagram of the driving assembly of the optical element driving device in

[0034] Figure 6 shows Figure 1 a partial schematic structural diagram of the driving assembly of the optical element driving device in

[0035] Figure 7 shows Figure 2 a schematic diagram of the positional relationship among the base, the pressing piece, and the carrier base of the optical element driving device in

[0036] Figure 8 shows Figure 2 a schematic diagram of the positional relationship among the base, the driving assembly, the lever piece assembly, the pressing piece, and the carrier base of the optical element driving device in

[0037] Figure 9 shows a schematic diagram of the movement of the carrier base when the energization amounts of multiple wires of the optical element driving device are different in a specific embodiment of the present application;

[0038] Figure 10 shows a schematic diagram of the movement of the carrier base when the energization amounts of multiple wires of the optical element driving device are the same in a specific embodiment of the present application;

[0039] Figure 11 shows a schematic diagram of the positional relationship among the FPC board, the elastic piece, and the base in another specific embodiment of the present application;

[0040] Figure 12 An exploded view of an optical element driving device in another specific embodiment of the present application is shown.

[0041] The above drawings include the following reference numerals:

[0042] 10. Shell; 11. Clearance gap; 20. Base; 21. Positioning column; 211. Overlapping surface; 212. Guide protrusion; 213. Positioning surface; 30. Support seat; 40. Drive assembly; 41. Drive structure; 411. FPC board; 4111. Drive arm; 412. Shrapnel; 42. SMA wire; 43. Movable gap; 44. Claw; 45. Extrusion piece; 46. Accommodating groove; 47. Piezoelectric ceramic sheet; 50. Lever sheet assembly; 51. Movable arm; 52. Frame; 60. Clearance gap; 70. Press sheet. DETAILED DESCRIPTION

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0045] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0046] In order to solve the problem of poor performance of a driving device of a camera device in the prior art, the present application provides an optical element driving device, a camera device and a mobile terminal.

[0047] It should be pointed out that the mobile terminal in the present application has a camera device, and the camera device in the present application has the following optical element driving device.

[0048] like Figures 1 to 12As shown in the figure, the optical element driving device in the present application includes a housing 10, a base 20, a carrier 30, a driving component 40, and a lever plate component 50. The housing 10 covers the base 20 and forms an accommodation space between the housing 10 and the base 20; the carrier 30 is movably arranged inside the accommodation space; the driving component 40 is movably arranged on one side of the base 20 facing the carrier 30; the lever plate component 50 has a plurality of movable arms 51 that can swing in the Z-axis direction, the lever plate component 50 is arranged between the carrier 30 and the driving component 40, and the carrier 30 abuts against the lever plate component 50; when the driving component 40 is powered on, at least a part of the driving component 40 moves relative to the base 20 and drives the movable arm 51 to swing in the Z-axis direction, so that the carrier 30 moves in the Z-axis direction or deflects relative to the Z-axis.

[0049] When using the optical element driving device in the present application, since the optical element driving device has the carrier 30, the optical elements (such as lenses and image sensors) in the camera module can be installed on the carrier 30. In this embodiment, the carrier 30 is a lens holder with a middle accommodation cavity to facilitate the installation of the lens in the lens holder. And since the lever plate component 50 has a plurality of movable arms 51 that can swing in the Z-axis direction, the lens holder can be driven to move by the swinging of the plurality of movable arms 51, so that the lens holder can move in the Z-axis direction or deflect relative to the Z-axis direction, thereby realizing the autofocus function or the anti-shake function. The swinging of the movable arm 51 is realized by the movement of the driving component 40 relative to the base 20. When the deformation amounts of the plurality of movable arms 51 are the same, the plurality of movable arms 51 can drive the lens holder to move in the Z-axis direction and realize AF driving. When the deformation amounts of the plurality of movable arms 51 are different, the shift anti-shake function of the lens can be realized. That is to say, in the present application, the lever plate component 50 and the driving component 40 of the lens driving device replace the driving coil, the driving magnet part, and the suspension anti-shake part in the original voice coil motor. And since the present application no longer requires structures such as springs that cooperate with the driving magnet and the driving coil, the lens driving device in the present application has a simpler structure than the existing voice coil motor. At the same time, there is no magnet, so there will be no internal or external magnetic interference problems. And, the lens driving device in the present application has no magnetic circuit design problem, and the average thrust of the whole stroke force is larger than that of the electromagnetic method, so it is more efficient than the existing voice coil motor. And, without the upper and lower spring designs of the voice coil motor, there will be no problems such as spring deformation, nickel or foreign object shedding in the drop and drum tests. Therefore, the lens driving device in the present application effectively solves the problem of poor performance of the driving device of the camera device in the prior art.

[0050] It should be noted that in this embodiment, the housing 10, the base 20, and the driving component 40 all have an opening structure for avoiding the lens of the mobile terminal.

[0051] It should be noted that in the present application, when the deformation amounts of multiple movable arms 51 are different and can drive the carrier 30 to deflect relative to the Z-axis, the anti-shake form at this time is shift anti-shake.

[0052] As Figure 2 , Figure 5 and Figure 9 shown, the driving component 40 includes a driving structure 41 and SMA wires 42. The driving structure 41 has a plurality of fixed ends and a plurality of movable ends, and the plurality of fixed ends are respectively fixedly connected to the base 20; there are a plurality of SMA wires 42, one end of each SMA wire 42 is connected to a fixed end, the other end of the SMA wire 42 is connected to a movable end, and the SMA wire 42 is electrically connected to the driving structure 41. When the SMA wire 42 is energized, the SMA wire 42 contracts and drives the movable end to move in a direction away from the base 20, and the movable end presses the movable arm 51 of the lever plate assembly 50, and the movable arm 51 drives the carrier 30 to move. It should be noted that in the present application, the SMA wire 42 has the property of shrinking when heated and expanding when cooled. Therefore, when the SMA wire 42 is energized, its temperature rises and it contracts. Since the two ends of the SMA wire 42 are respectively connected to the fixed end and the movable end, when the SMA wire 42 contracts, the SMA wire 42 can drive the movable end to move, so as to ensure that the movable end can move relative to the base 20, and further drive the movable arm 51 to swing along the Z-axis.

[0053] Optionally, when the SMA wire 42 is in an unenergized state, the length direction of the SMA wire 42 is the same as the length direction of the corresponding movable arm 51.

[0054] Specifically, there are a plurality of SMA wires 42, and the plurality of SMA wires 42, the plurality of movable arms 51, the plurality of fixed ends, and the plurality of movable ends correspond one by one, and different SMA wires 42 respectively correspond to different fixed ends and different movable ends.

[0055] In a specific embodiment of the present application, there are four SMA wires 42, four movable arms 51, four fixed ends, and four movable ends. The four movable arms 51 are arranged in two pairs in parallel, and the two mutually parallel movable arms 51 are perpendicular to the other two mutually parallel movable arms 51; and / or among the four SMA wires 42, the mutually approaching ends of two adjacent SMA wires 42 are respectively connected to the movable end and the fixed end. Of course, in the present application, the number of SMA wires 42, movable arms 51, fixed ends, and movable ends can be changed according to the shape of the carrier 30 or the shape of the base 20 or the shape of the housing 10 to ensure the stability of the carrier 30 during movement.

[0056] In a specific embodiment of the present application, as Figures 2 to 10As shown, the driving structure 41 includes an FPC board 411 and a plurality of elastic pieces 412. The FPC board 411 is fixedly connected to the base 20. The FPC board 411 has a fixed end and is electrically connected to the SMA wire 42. Each movable arm 51 corresponds to at least one elastic piece 412. The elastic pieces 412 are movably arranged on the side of the FPC board 411 away from the base 20. One end of the elastic piece 412 is fixed to the FPC board 411 and forms an electrical connection, and the other end of the elastic piece 412 is a movable end and can move relative to the FPC board 411. In this embodiment, the FPC board 411 is connected to the base 20, and one end of the elastic piece 412 is fixedly arranged on the FPC board 411. The other end of the elastic piece 412 can move relative to the FPC board 411 and is the movable end of the driving assembly 40. At this time, one end of the SMA wire 42 is arranged on the FPC board 411, and the other end of the SMA wire 42 is arranged on the movable end of the elastic piece 412. Therefore, after the SMA wire 42 is energized, the SMA wire 42 can drive the movable end of the elastic piece 412 to move, and then squeeze the movable arm 51 of the lever assembly through the movable end to drive the carrier 30 to move. And it is worth noting that in this embodiment, the elastic piece 412 and the base 20 are respectively located on both sides of the FPC board 411.

[0057] In another specific embodiment of the present application, as Figure 11 shown, the driving structure 41 includes an FPC board 411. The FPC board 411 is electrically connected to the SMA wire 42. The FPC board 411 has a plurality of driving arms 4111. The plurality of driving arms 4111 respectively correspond to the plurality of movable arms 51 one by one. The driving arms 4111 respectively have a fixed end and a movable end. That is to say, in the present application, the part of the FPC board 411 with the driving arms 4111 can move relative to the base 20, and the reason why the driving arms 4111 can move relative to the base 20 is that the two ends of the SMA wire 42 are respectively connected to the fixed end and the movable end of the driving arms 4111. After the SMA wire 42 is energized, it can drive the movable end of the driving arms 4111 to move relative to the base 20, and then drive the carrier 30 to move through the movable arms 51. Preferably, the driving structure 41 further includes a plurality of elastic pieces 412. The plurality of elastic pieces 412 respectively correspond to the plurality of driving arms 4111 one by one. The elastic pieces 412 are arranged on the side of the driving arms 4111 close to the base 20. Optionally, there is a movable gap 43 between the elastic piece 412 and the end of the driving arm 4111 with the fixed end. By setting like this, when the SMA wire 42 is energized and drives the FPC board 411 to move, the elastic piece 412 will also move. At this time, the movable gap 43 can provide a movement space and a support fulcrum for the elastic piece 412, so as to provide a more stable driving force in the Z-axis direction for the movable end of the driving arm 4111 of the FPC board 411 to the movable arm 51 of the lever assembly.

[0058] Specifically, the driving component 40 further includes a plurality of pressing members 45. At least one pressing member 45 is respectively arranged on one side of each active end facing the active arm 51, and the pressing member 45 abuts against the active arm 51. In this application, the purpose of arranging the pressing member 45 is mainly to serve as a fulcrum for the active arm 51 to be lifted, so as to ensure that the active arm 51 can drive the bearing seat 30 to achieve a large-stroke movement.

[0059] In a specific embodiment of this application, the pressing member 45 is a ball. Of course, in this application, the pressing member 45 can also be set in other shapes, such as square or cylindrical, etc.

[0060] In a specific embodiment of this application, as Figure 12 shown, the driving component 40 includes an FPC board 411 and a plurality of piezoelectric ceramic sheets 47. The FPC board 411 is fixedly connected to the base 20. The FPC board 411 has a fixed end, and the FPC board 411 is electrically connected to the SMA wire 42; each active arm 51 corresponds to at least one piezoelectric ceramic sheet 47. The piezoelectric ceramic sheet 47 is movably arranged on the side of the FPC board 411 away from the base 20. One end of the piezoelectric ceramic sheet 47 is fixedly connected to the FPC board 411, and the other end of the piezoelectric ceramic sheet 47 is an active end and can move relative to the FPC board 411. That is to say, in this embodiment, the piezoelectric ceramic sheet 47 is used to replace the above-mentioned elastic sheet 412 and SMA wire 42. When the piezoelectric ceramic sheet 47 is powered on, it deforms and can bend in the direction away from the base 20, so as to drive the pressing member 45 to drive the active arm 51 to swing in the Z-axis direction.

[0061] Optionally, the active end has a receiving groove 46, and at least a part of the ball is movably arranged in the receiving groove 46.

[0062] Optionally, the ball is fixedly arranged on the active end. Of course, in this embodiment, a receiving groove 46 can also be arranged on the active end, and the ball can be fixedly arranged inside the receiving groove 46.

[0063] Optionally, the ball is fixed to the active end by glue.

[0064] It should be noted that in the above embodiment, the elastic sheet 412 mainly plays an elastic support role, so as to provide a sufficiently stable support force for the support of the pressing member 45 on the active arm 51 in terms of strength and direction.

[0065] Specifically, the elastic sheet 412 is made of a metal material.

[0066] Preferably, the elastic sheet 412 is a stainless steel sheet.

[0067] It should be noted that in the present application, through the cooperation of the lever piece assembly 50, the driving assembly 40, and the pressing member 45, the lever principle can be utilized, so that a large-stroke displacement is formed at one end of the movable arm 51 moving relative to the base 20, thereby realizing the large-stroke AF driving of the carrier 30, and further improving the use performance of the optical element driving device.

[0068] Specifically, the driving assembly 40 further includes a plurality of claws 44, and both ends of the SMA wire 42 are respectively connected to the fixed end and the movable end through the claws 44. By setting like this, the stability of the connection between the SMA wire 42 and the fixed end and the movable section can be effectively ensured. And by setting like this, it can also effectively prevent the middle part of the SMA wire 42 from contacting the elastic piece 412 or the FPC board 411.

[0069] Specifically, the lever piece assembly 50 includes a frame 52. The corners of the frame 52 are respectively connected to the base 20, and a plurality of movable arms 51 are respectively connected to the inner edge of the frame 52. In a specific embodiment of the present application, the frame 52 is quadrilateral, and there are four movable arms 51, and the four movable arms 51 are respectively arranged on the four inner sides of the frame 52. By setting, the stability of the movable arm 51 during the movement can be ensured through the connection between the corners of the frame 52 and the base 20.

[0070] Optionally, the frame 52 and the movable arm 51 are of an integrally formed structure.

[0071] Optionally, the first end of the movable arm 51 is connected to the frame 52, the second end of the movable arm 51 can swing along the Z axis, and the adjacent ends of the two movable arms 51 that are close to each other are the first end and the second end respectively. It should be noted that as Figure 3 shown, in the present application, the portion of the movable arm 51 pressed by the pressing member 45 is relatively close to the end where the movable arm 51 is connected to the frame 52, so that the large-stroke movement of the carrier 30 can be realized under the lever action.

[0072] As Figure 9 and Figure 10 shown, in the present application, when the energization amounts of the plurality of SMA wires 42 are different, the swinging distances of the different movable arms 51 corresponding to the different SMA wires 42 along the Z axis are different, so that the carrier 30 can be deflected relative to the Z axis. And when the energization amounts of the plurality of SMA wires 42 are the same, the swinging distances of the different movable arms 51 corresponding to the different SMA wires 42 along the Z axis are the same, so that the carrier 30 can move along the Z axis.

[0073] Specifically, each corner of the base 20 respectively has at least one positioning post 21 extending towards the carrier 30, and the positioning post 21 has a lapping surface 211, and the corners of the frame 52 are lapped on the lapping surface 211.

[0074] Optionally, a guiding projection 212 extending towards the carrier 30 is provided on the lapping surface 211, and the frame 52 and the carrier 30 respectively have avoiding notches 60 for avoiding the guiding projection 212.

[0075] Optionally, the circumferential side wall of the positioning post 21 has a positioning surface 213 facing the driving assembly 40, and the corner of the FPC board 411 of the driving assembly 40 has a cross section that cooperates with the positioning surface 213.

[0076] Specifically, the optical element driving device further includes a pressing piece 70. The pressing piece 70 is disposed on the side of the carrier 30 away from the driving assembly 40 and is connected to the positioning post 21 to provide a restoring force for the carrier 30 to move towards the driving assembly 40. It should be noted that in the present application, when the SMA wire 42 is in an unpowered state, a pre-tightening force can be provided for the carrier 30 through the pressing piece 70, so that after the SMA wire 42 is powered on, a balancing force can be provided for the carrier 30 during the movement along the Z-axis through the pressing piece 70, and a restoring force can be provided for the carrier 30 after the SMA wire 42 is powered off.

[0077] In a specific embodiment of the present application, the pressing piece 70 includes: an extrusion part, the extrusion part is annular and abuts against the carrier 30; a connecting part, there are a plurality of connecting parts, the plurality of connecting parts correspond to the plurality of positioning posts 21 one by one, and one end of the connecting part is connected to the extrusion part, and the other end of the connecting part is connected to the positioning post 21.

[0078] Optionally, the circumferential side wall of the housing 10 has a relief notch 11 for avoiding the FPC board 411 of the driving assembly 40. In the present application, the FPC has a bent section, and the end of the bent section has a wiring pin, and the relief notch 11 is used to avoid the end of the bent section having a wiring pin. And, there are a plurality of wiring pins on the bent section, and the plurality of wiring pins respectively correspond to different SMA wires, so as to ensure that different SMA wires can be supplied with the same or different amounts of electricity.

[0079] Optionally, the housing 10 is made of plastic material.

[0080] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0081] 1. The structure is simple and easy to assemble, the circuit wiring is simple, and the circuit is stable.

[0082] 2. Without magnets, there will be no internal or external magnetic interference problems.

[0083] 3. Without magnetic circuit design problems, the force during the whole stroke is average, and the thrust is greater than that of the magnetoelectric method, and it is more efficient than the magnetoelectric method.

[0084] 4. Without the upper and lower spring designs of the voice coil motor, there will be no problems such as spring deformation, nickel or foreign object shedding during drop and drum tests.

[0085] 5. Plastic can be used for the motor housing, which is helpful for the antenna db gain of the mobile terminal.

[0086] 6. The motor can be made into different external shapes and structures.

[0087] 7. The elastic support can also function as a dust-proof ring, and the dust-proof effect is better than that of the magnetoelectric method.

[0088] 8. The size area of the finished motor with the same lens diameter can be smaller than that of the magnetoelectric method.

[0089] Obviously, the embodiments described above are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0090] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0091] It should be noted that the terms "first", "second", etc. in the description, claims and drawings of the present application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein.

[0092] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical element driving device, characterized in that, Comprising: A housing (10); A base (20), with the housing (10) covering the base (20) and forming an accommodation space therebetween; A carrier seat (30), which is movably arranged inside the accommodation space; A driving component (40), which is movably arranged on one side of the base (20) facing the carrier seat (30); A lever plate assembly (50), which has a plurality of movable arms (51) that can swing in the Z-axis direction. The lever plate assembly (50) is arranged between the carrier seat (30) and the driving component (40), and the carrier seat (30) abuts against the lever plate assembly (50); When the driving component (40) is powered on, at least a part of the driving component (40) moves relative to the base (20) and drives the movable arm (51) to swing in the Z-axis direction, so that the carrier seat (30) moves in the Z-axis direction or deflects relative to the Z-axis; The driving component (40) includes: a driving structure (41), which has a plurality of fixed ends and a plurality of movable ends, and the plurality of fixed ends are respectively fixedly connected to the base (20); SMA wires (42), there are a plurality of SMA wires (42). One end of each SMA wire (42) is connected to a fixed end, the other end of the SMA wire (42) is connected to a movable end, and the SMA wire (42) is electrically connected to the driving structure (41). When the SMA wire (42) is powered on, the SMA wire (42) contracts and drives the movable end to move in a direction away from the base (20), and the movable end presses the movable arm (51) of the lever plate assembly (50), and the movable arm (51) drives the carrier seat (30) to move; The driving component (40) further includes a plurality of pressing members (45), and at least one pressing member (45) is respectively arranged on one side of each movable end facing the movable arm (51), and the pressing member (45) abuts against the movable arm (51); The lever plate assembly (50) includes a frame (52), the corners of the frame (52) are respectively connected to the base (20), and the plurality of movable arms (51) are respectively connected to the inner edge of the frame (52); The pressing member (45) presses the movable arm (51) near the part where the movable arm (51) is connected to the frame (52).

2. The optical element driving device according to claim 1, characterized in that, The driving structure (41) includes: An FPC board (411), which is fixedly connected to the base (20), the FPC board (411) has the fixed end, and the FPC board (411) is electrically connected to the SMA wire (42); A plurality of elastic pieces (412), each of the movable arms (51) corresponding to at least one of the elastic pieces (412). The elastic pieces (412) are movably arranged on the side of the FPC board (411) away from the base (20). One end of the elastic piece (412) is fixedly connected to the FPC board (411), and the other end of the elastic piece (412) is a movable end and can move relative to the FPC board (411).

3. The optical element driving device according to claim 1, characterized in that, The driving structure (41) includes an FPC board (411). The FPC board (411) is electrically connected to the SMA wire (42). The FPC board (411) has a plurality of driving arms (4111). The plurality of driving arms (4111) respectively correspond to the plurality of movable arms (51) one by one. The driving arms (4111) respectively have the fixed end and the movable end.

4. The optical element driving device according to claim 3, characterized in that, The driving structure (41) further includes a plurality of elastic pieces (412). The plurality of elastic pieces (412) respectively correspond to the plurality of driving arms (4111) one by one. The elastic pieces (412) are arranged on the side of the driving arms (4111) close to the base (20).

5. The optical element driving device according to claim 4, characterized in that, There is an activity gap (43) between the elastic piece (412) and the end of the driving arm (4111) having the fixed end.

6. The optical element driving device according to claim 1, characterized in that, The driving assembly (40) further includes a plurality of claws (44). The two ends of the SMA wire (42) are respectively connected to the fixed end and the movable end through the claws (44).

7. The optical element driving device according to claim 1, characterized in that, The pressing member (45) is a ball. The movable end has a receiving groove (46). At least a part of the ball is movably arranged in the receiving groove (46); or The ball is fixedly arranged on the movable end.

8. The optical element driving device according to claim 1, characterized in that, There are a plurality of SMA wires (42). The plurality of SMA wires (42), the plurality of movable arms (51), the plurality of fixed ends, and the plurality of movable ends correspond to each other one by one. Different SMA wires (42) respectively correspond to different fixed ends and different movable ends.

9. The optical element driving device according to claim 8, characterized in that, There are four SMA wires (42), four movable arms (51), four fixed ends, and four movable ends. The four movable arms (51) are arranged in parallel in pairs. The two mutually parallel movable arms (51) are perpendicular to the other two mutually parallel movable arms (51); and / or Among the four SMA wires (42), the mutually adjacent ends of two adjacent SMA wires (42) are respectively connected to the movable end and the fixed end.

10. The optical element driving device according to claim 9, characterized in that, The driving assembly (40) includes: An FPC board (411). The FPC board (411) is fixedly connected to the base (20). The FPC board (411) has the fixed end, and the FPC board (411) is electrically connected to the SMA wire (42). A plurality of piezoelectric ceramic sheets (47), each of the movable arms (51) corresponding to at least one of the piezoelectric ceramic sheets (47), the piezoelectric ceramic sheets (47) being movably arranged on a side of the FPC board (411) away from the base (20), one end of the piezoelectric ceramic sheet (47) being fixedly connected to the FPC board (411), and the other end of the piezoelectric ceramic sheet (47) being a movable end and being capable of moving relative to the FPC board (411).

11. The optical element driving device according to any one of claims 1 to 10, characterized in that, The first end of the movable arm (51) is connected to the frame (52), the second end of the movable arm (51) is capable of swinging along the Z axis, and the ends of two adjacent movable arms (51) that are close to each other are the first end and the second end, respectively.

12. The optical element driving device according to any one of claims 1 to 10, characterized in that, Each corner of the base (20) is provided with at least one positioning column (21) extending towards the bearing seat (30), and the positioning column (21) has a lap joint surface (211), and the corner of the frame (52) is lap jointed on the lap joint surface (211).

13. The optical element driving device according to claim 12, characterized in that, The overlapping surface (211) is provided with a guide protrusion (212) extending towards the bearing seat (30), and the frame (52) and the bearing seat (30) respectively have an avoidance notch (60) for avoiding the guide protrusion (212); and / or The circumferential side wall of the positioning column (21) has a positioning surface (213) arranged toward the drive assembly (40).

14. The optical element driving device according to claim 12, characterized in that, The optical element driving device further comprises a pressing plate (70), wherein the pressing plate (70) is arranged on a side of the bearing seat (30) away from the driving assembly (40) and connected to the positioning column (21) to provide a restoring force for the bearing seat (30) to move towards the driving assembly (40).

15. The optical element driving device according to any one of claims 1 to 10, characterized in that, The circumferential side wall of the housing (10) has a clearance notch (11) for evading the FPC board (411) of the drive assembly (40).

16. An imaging device, characterized in that, The imaging device includes the optical element driving device according to any one of claims 1 to 15.

17. A mobile terminal, characterized in that, The mobile terminal includes the camera device according to claim 16.

Images