CN114236946A - Optical element driving device, image pickup device, and mobile terminal - Google Patents

Abstract

The invention provides an optical element driving device, an image pickup device and a mobile terminal. The optical element driving device includes: a housing; the shell is covered on the base and forms an accommodating space with the base; the bearing seat is movably arranged in the accommodating space; the driving component is movably arranged on one side of the base, which faces the bearing seat; the lever sheet assembly is provided with a plurality of movable arms capable of swinging along the Z-axis direction, the lever sheet assembly is arranged between the bearing seat and the driving assembly, and the bearing seat is abutted against the lever sheet assembly; when the driving assembly is electrified, at least one part of the driving assembly moves relative to the base and drives the movable arm to swing along the Z-axis direction, so that the bearing seat moves along the Z-axis direction or deflects relative to the Z-axis. The invention solves the problem of poor use performance of the driving device of the camera shooting device in the prior art.

Description

Optical element driving device, image pickup device, and mobile terminal

Technical Field

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

A video camera or a still camera usually employs a lens with adjustable focal length or automatic focusing, and the adjustment process is to change the position of the lens or an image sensor, and a driving motor is usually used for driving the lens and the image sensor to move. At present, the automatic focusing of a camera head of a handheld camera device, especially a mobile phone, is basically completed by using a Voice Coil Motor (VCM), which is a system composed of a Coil and a magnet. The coil after being electrified is subjected to electromagnetic force in a magnetic field, the winding carrier is driven to linearly move along the optical axis direction (namely Z axis) of the lens under the action of the electromagnetic force, and the winding carrier finally stays at a position point when the resultant force of the electromagnetic force generated between the annular coil and the driving magnet and the elastic force of the upper spring and the lower spring reaches a phase equilibrium state.

Although the voice coil motor has the advantages of mature technology, low cost, low noise and the like, along with the increase of the requirement of the camera device on the camera shooting, the voice coil motor has the problems of magnetic interference, insufficient thrust and unstable structure and performance. For example: the double-shooting motor is developed and applied to various middle and high-end mobile phones, but certain puzzlement difficulty exists in the practical application process, particularly, a certain degree of magnetic interference phenomenon exists between two double-shooting motors, the normal performance of the effect of the double-shooting motors is influenced, the defect cannot be avoided by the voice coil motor, and meanwhile, various improvement schemes are easy to cause the complexity of the motor structure and the improvement of the assembly process difficulty; electric conduction and connection assembly among all parts in the voice coil motor are realized through modes such as welding, hot riveting, point gluing, coil circular telegram needs to be through last/lower spring intercommunication simultaneously, the route that leads to coil circular telegram is longer, because voice coil motor part number is more, need welding, hot riveting, point gluing department is more, when the cell-phone is in case receiving external force such as falling the striking, the motor is because external force vibrates and leads to inside welding point or point gluing department to pull phenomenon such as drop or spring deformation easily, the inside electric property of final motor and integrated configuration receive destruction, influence the performance of motor normal performance, bring unfavorable consequence for the shooting effect.

Therefore, the driving device of the imaging device in the prior art has the problem of poor usability.

Disclosure of Invention

The invention mainly aims to provide an optical element driving device, an image pickup device and a mobile terminal, so as to solve the problem that the driving device of the image pickup device in the prior art is poor in use performance.

In order to achieve the above object, according to one aspect of the present invention, there is provided an optical element driving device including: a housing; the shell is covered on the base and forms an accommodating space with the base; the bearing seat is movably arranged in the accommodating space; the driving component is movably arranged on one side of the base, which faces the bearing seat; the lever sheet assembly is provided with a plurality of movable arms capable of swinging along the Z-axis direction, the lever sheet assembly is arranged between the bearing seat and the driving assembly, and the bearing seat is abutted against the lever sheet assembly; when the driving assembly is electrified, at least one part of the driving assembly moves relative to the base and drives the movable arm to swing along the Z-axis direction, so that the bearing seat moves along the Z-axis direction or deflects relative to the Z-axis.

Further, the drive assembly includes: the driving structure is provided with a plurality of fixed ends and a plurality of movable ends, and the fixed ends are respectively and fixedly connected with the base; and when the SMA wires are electrified, the SMA wires contract and drive the movable ends to move along the direction far away from the base, the movable ends extrude the movable arms of the lever plate assembly, and the movable arms drive the bearing seat to move.

Further, the driving structure includes: the FPC board is fixedly connected with the base, the FPC board is provided with a fixed end, and the FPC board is electrically connected with the SMA wire; each movable arm corresponds to at least one elastic sheet, the elastic sheets are movably arranged on one side, away from the base, of the FPC board, one end of each elastic sheet is fixedly connected with the FPC board, and the other end of each elastic sheet is a movable end and can move relative to the FPC board.

Further, the drive structure includes FPC board, and FPC board is connected with SMA silk thread electricity, and FPC board has a plurality of actuating arms, a plurality of actuating arms respectively with a plurality of digging arms one-to-one, the actuating arm has stiff end and digging end respectively.

Furthermore, the driving structure further comprises a plurality of elastic sheets, the elastic sheets are in one-to-one correspondence with the driving arms respectively, and the elastic sheets are arranged on one sides of the driving arms close to the base.

Furthermore, a movable gap is formed between the elastic sheet and one end of the driving arm, which is provided with a fixed end.

Furthermore, the driving assembly further comprises a plurality of clamping jaws, and two ends of the SMA wire are connected with the fixed end and the movable end through the clamping jaws respectively.

Further, the drive assembly further comprises a plurality of extrusion pieces, wherein at least one extrusion piece is arranged on one side, facing the movable arm, of each movable end, and the extrusion pieces are abutted to the movable arm.

Further, the extrusion piece is a ball, the movable end is provided with a containing groove, and at least one part of the ball is movably arranged in the containing groove; or the ball bearing is fixedly arranged on the movable end.

Further, the SMA silk threads are multiple, the multiple SMA silk threads, the multiple movable arms, the multiple fixed ends and the multiple movable ends are in one-to-one correspondence, and different SMA silk threads correspond to different fixed ends and different movable ends respectively.

Furthermore, the number of the SMA wires, the four movable arms, the four fixed ends and the four movable ends is four, the four movable arms are arranged in parallel in pairs, and the two parallel movable arms are perpendicular to the other two parallel movable arms; and/or one end, close to each other, of each of the two adjacent SMA wire wires is connected with the movable end and the fixed end respectively.

Further, the drive assembly includes: the FPC board is fixedly connected with the base, the FPC board is provided with a fixed end, and the FPC board is electrically connected with the SMA wire; each movable arm corresponds to at least one piezoelectric ceramic piece, the piezoelectric ceramic pieces are movably arranged on one side, away from the base, of the FPC board, one end of each piezoelectric ceramic piece is fixedly connected with the FPC board, and the other end of each piezoelectric ceramic piece is a movable end and can move relative to the FPC board.

Further, the lever plate assembly includes a frame, corners of the frame are connected to the base, respectively, and a plurality of movable arms are connected to an inner edge of the frame, respectively.

Furthermore, the first end of each movable arm is connected with the frame, the second end of each movable arm can swing along the Z axis, and the end, close to each other, of each two adjacent movable arms is the first end and the second end respectively.

Furthermore, each corner of the base is respectively provided with at least one positioning column extending towards the bearing seat, each positioning column is provided with a lapping surface, and the corner of the frame is lapped on the lapping surface.

Furthermore, a guide protrusion extending towards the bearing seat is arranged on the lapping surface, and the frame and the bearing seat are respectively provided with an avoiding notch for avoiding the guide protrusion; and/or the circumferential side wall of the positioning column has a positioning surface arranged towards the drive assembly.

Furthermore, the optical element driving device further comprises a pressing sheet, wherein the pressing sheet is arranged on one side, far away from the driving assembly, of the bearing seat and is connected with the positioning column, so that the bearing seat provides a reset force moving towards the driving assembly.

Further, the circumferential side wall of the outer shell is provided with an avoiding notch used for avoiding the FPC board of the driving assembly.

According to another aspect of the present invention, there is provided an image pickup apparatus including the optical element driving apparatus described above.

According to another aspect of the present invention, there is provided a mobile terminal including the above-described image pickup device.

By applying the technical scheme of the invention, the optical element driving device comprises a shell, a base, a bearing seat, a driving assembly and a lever plate assembly. The shell is covered on the base and forms an accommodating space with the base; the bearing seat is movably arranged in the accommodating space; the driving component is movably arranged on one side of the base, which faces the bearing seat; the lever sheet assembly is provided with a plurality of movable arms capable of swinging along the Z-axis direction, the lever sheet assembly is arranged between the bearing seat and the driving assembly, and the bearing seat is abutted to the lever sheet assembly; when the driving assembly is electrified, at least one part of the driving assembly moves relative to the base and drives the movable arm to swing along the Z-axis direction, so that the bearing seat moves along the Z-axis direction or deflects relative to the Z-axis.

When using the optical element drive arrangement in this application, will make a video recording the optical element in the module and install on bearing the seat, because the lever piece subassembly has a plurality of digging arms that can follow the wobbling of Z axle direction, so can drive through the swing of a plurality of digging arms and bear the seat and remove to can make and bear the seat and produce the skew along the motion of Z axle direction or relative Z axle direction, and then realize automatic focusing function or anti-shake function. And the swinging of the movable arm is realized by the movement of the driving component relative to the base. When the deformation of the movable arms is the same, the movable arms can drive the bearing seat to move along 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, in the present application, the driving coil, the driving magnet portion, and the suspension anti-shake portion in the conventional voice coil motor are replaced by the lever plate assembly and the driving assembly of the optical element driving apparatus. In addition, since the structure of the spring and the like which are matched with the driving magnet and the driving coil is not needed, the optical element driving device in the application is simpler than the structure of the existing voice coil motor. Meanwhile, no magnet exists, so that the problem of magnetic interference inside or outside is avoided. In addition, the optical element driving device in the application has no magnetic circuit design problem, and the average thrust of the whole stroke is larger than that of an electromagnetic mode, so that the driving device is more efficient compared with the existing voice coil motor. And, there is not the upper and lower spring design of voice coil motor, falls and test such as cylinder and does not have spring deformation, nickel or foreign matter dropout problem. Therefore, the optical element driving device in the application effectively solves the problem that the driving device of the image pickup device in the prior art is poor in service performance.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic configuration of an optical element driving apparatus according to an embodiment of the present invention;

fig. 2 shows an exploded view of the optical element driving apparatus of fig. 1;

FIG. 3 is a schematic view showing a positional relationship among a carrier base, a lever blade assembly, and a pressing member of the optical element driving apparatus of FIG. 1;

fig. 4 is a schematic view showing a structure of a lever plate assembly of the optical element driving apparatus of fig. 2;

fig. 5 is a schematic view showing a structure of a driving assembly of the optical element driving apparatus of fig. 1;

fig. 6 is a schematic view showing a partial structure of a driving assembly of the optical element driving apparatus of fig. 1;

FIG. 7 is a schematic view showing a positional relationship among a base, a pressing sheet, and a carrying base of the optical element driving apparatus of FIG. 2;

fig. 8 is a schematic view showing a positional relationship among a base, a driving assembly, a lever plate assembly, a pressing piece, and a carrying base of the optical element driving apparatus of fig. 2;

FIG. 9 is a schematic diagram illustrating the movement of the carriage when the plurality of wires of the optical element driving device are energized at different levels in one embodiment of the present application;

FIG. 10 is a schematic diagram illustrating the movement of the carrier when the electrical energization levels of the plurality of wires of the optical element driving apparatus are the same in one embodiment of the present application;

FIG. 11 is a schematic diagram showing the positional relationship of the FPC board, the resilient tab and the base in another embodiment of the present application;

fig. 12 shows an exploded view of an optical element driving device in another embodiment of the present application.

Wherein the figures include the following reference numerals:

10. a housing; 11. a abdication gap; 20. a base; 21. a positioning column; 211. a lapping surface; 212. a guide projection; 213. positioning the surface; 30. a bearing seat; 40. a drive assembly; 41. a drive structure; 411. an FPC board; 4111. a drive arm; 412. a spring plate; 42. SMA wire; 43. a clearance for movement; 44. a claw; 45. an extrusion; 46. accommodating grooves; 47. piezoelectric ceramic plates; 50. a lever plate assembly; 51. a movable arm; 52. a frame; 60. avoiding the notch; 70. and (6) tabletting.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless specified to the contrary, use of the terms of orientation such as "upper, lower, top, bottom" or the like, generally refer to the orientation as shown in the drawings, or to the component itself in a vertical, perpendicular, or gravitational orientation; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the problem that a driving device of an image pickup device in the prior art is poor in service performance, the application provides an optical element driving device, an image pickup device and a mobile terminal.

Note that the mobile terminal in the present application has an image pickup device, and the image pickup device in the present application has an optical element driving device described below.

As shown in fig. 1 to 12, the optical element driving apparatus of the present application includes a housing 10, a base 20, a carrier 30, a driving assembly 40, and a lever plate assembly 50. The housing 10 is covered on the base 20 and forms an accommodating space with the base 20; the bearing seat 30 is movably arranged in the accommodating space; the driving assembly 40 is movably arranged on one side of the base 20 facing the carrying seat 30; the lever plate assembly 50 has a plurality of movable arms 51 capable of swinging along the Z-axis direction, the lever plate assembly 50 is arranged between the bearing seat 30 and the driving assembly 40, and the bearing seat 30 is abutted with the lever plate assembly 50; when the driving assembly 40 is powered on, at least a portion of the driving assembly 40 moves relative to the base 20 and drives the movable arm 51 to swing along the Z-axis direction, so that the carriage 30 moves along the Z-axis direction or deflects relative to the Z-axis.

When using the optical element driving device in this application, because the optical element driving device has the bearing seat 30, so can install the optical element (such as a lens, an image sensor) in the camera module on bearing seat 30, bearing seat 30 in this embodiment is the lens seat that holds the chamber in the middle of the area, so that conveniently install the lens in the lens seat, and because lever piece subassembly 50 has a plurality of movable arms 51 that can follow the wobbling of Z axle direction, so can drive the lens seat to move through the swing of a plurality of movable arms 51, thereby can make the lens seat along the movement of Z axle direction or produce the skew relative Z axle direction, and then realize auto-focusing function or anti-shake function. While the swinging of the movable arm 51 is accomplished by the movement of the drive assembly 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 move the lens mount in the Z-axis direction and realize AF drive. 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, in the present application, the driving coil, the driving magnet portion, and the suspension anti-shake portion of the voice coil motor are replaced by the lever plate assembly 50 and the driving assembly 40 of the lens driving apparatus. In addition, the lens driving device in the application is simpler in structure compared with the existing voice coil motor because structures such as a spring matched with the driving magnet and the driving coil are not needed any more. Meanwhile, no magnet exists, so that the problem of magnetic interference inside or outside is avoided. And, the lens drive arrangement in this application does not have the magnetic circuit design problem, and whole stroke dynamics average thrust is great than the electromagnetism mode, consequently compares more efficient with current voice coil motor. And, there is not the upper and lower spring design of voice coil motor, falls and test such as cylinder and does not have spring deformation, nickel or foreign matter dropout problem. Therefore, the lens driving device in the application effectively solves the problem that the driving device of the camera shooting device in the prior art is poor in service performance.

It should be noted that, in the present embodiment, the housing 10, the base 20 and the driving assembly 40 all have an opening structure for avoiding a lens of the mobile terminal.

It should be noted that, in the present application, when the deformation amounts of the plurality of movable arms 51 are different and can drive the carrier 30 to deflect relative to the Z axis, the anti-shake mode is a shift-axis anti-shake mode.

As shown in fig. 2, 5 and 9, the drive assembly 40 includes a drive structure 41 and SMA wires 42. The driving structure 41 has a plurality of fixed ends and a plurality of movable ends, and the fixed ends are respectively fixedly connected with the base 20; the number of the SMA wires 42 is multiple, one end of each SMA wire 42 is connected to the fixed end, the other end of each SMA wire 42 is connected to the movable end, and each SMA wire 42 is electrically connected to the driving structure 41, when the SMA wires 42 are powered on, the SMA wires 42 contract and drive the movable ends to move in a direction away from the base 20, the movable ends extrude the movable arms 51 of the lever plate assembly 50, and the movable arms 51 drive the bearing seat 30 to move. It should be noted that, in the present application, the SMA wire 42 has a property of thermal shrinkage and cold expansion, so that when the SMA wire 42 is powered on, the temperature rises and contracts, and since two ends of the SMA wire 42 are respectively connected to the fixed end and the movable end, the SMA wire 42 can drive the movable end to move when the SMA wire 42 contracts, so that it can be ensured that the movable end can move relative to the base 20, and further, the movable arm 51 can be driven to swing along the Z axis.

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

Specifically, the number of the SMA wires 42 is plural, the plural SMA wires 42, the plural movable arms 51, the plural fixed ends, and the plural movable ends correspond to one another, and different SMA wires 42 correspond to different fixed ends and different movable ends, respectively.

In a specific embodiment of the present application, the number of the SMA wires 42, the movable arms 51, the fixed ends, and the movable ends is four, the four movable arms 51 are arranged in parallel, and two of the two parallel movable arms 51 are perpendicular to the other two parallel movable arms 51; and/or one end of each of the four SMA wires 42, which is close to each other, of the two adjacent SMA wires 42 is connected to the movable end and the fixed end, respectively. Of course, the number of SMA wires 42, movable arms 51, fixed ends and movable ends may be modified in the present application 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.

In one embodiment of the present application, as shown in fig. 2 to 10, the driving structure 41 includes an FPC board 411 and a plurality of elastic pieces 412. The FPC board 411 is fixedly connected with the base 20, the FPC board 411 is provided with a fixed end, and the FPC board 411 is electrically connected with the SMA wire 42; each movable arm 51 corresponds to at least one elastic sheet 412, the elastic sheet 412 is movably arranged on one side of the FPC board 411 far away from the base 20, one end of the elastic sheet 412 is fixed with the FPC board 411 to form an electric connection, and the other end of the elastic sheet 412 is a movable end and can move relative to the FPC board 411. In this embodiment, the FPC board 411 is connected with the base 20, and, the one end of the elastic sheet 412 is fixedly arranged on the FPC board 411, the other end of the elastic sheet 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 sheet 412, so after the SMA wire 42 is electrified, the SMA wire 42 can drive the movable end of the elastic sheet 412 to move, and then the movable arm 51 of the lever assembly is extruded through the movable end to drive the bearing seat 30 to move. Note that, in the present embodiment, the elastic sheet 412 and the base 20 are respectively located at two sides of the FPC board 411.

In another embodiment of the present application, as shown in fig. 11, 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, and the driving arms 4111 respectively have a fixed end and a movable end. That is to say, in this application, the portion of the FPC board 411 having the driving arm 4111 is movable relative to the base 20, and the reason that the driving arm 4111 is movable relative to the base 20 is that two ends of the SMA wire 42 are respectively connected to the fixed end and the movable end of the driving arm 4111, and after the SMA wire 42 is powered on, the movable end of the driving arm 4111 can be driven to move relative to the base 20, so as to drive the bearing seat 30 to move through the movable arm 51. Preferably, the driving structure 41 further includes a plurality of resilient pieces 412, the resilient pieces 412 are respectively in one-to-one correspondence with the plurality of driving arms 4111, and the resilient pieces 412 are disposed on one side of the driving arms 4111 close to the base 20. Optionally, a movable gap 43 is provided between the elastic piece 412 and the end of the driving arm 4111 having the fixed end. Through setting up like this, when SMA silk thread 42 circular telegram and drive FPC board 411 motion, shell fragment 412 can produce the motion equally, then can provide motion space and support the fulcrum for shell fragment 412 through activity clearance 43 this moment to can provide the drive power of more stable Z axle direction for FPC board 411 actuating arm 4111's expansion end to lever assembly's movable arm 51.

Specifically, the drive assembly 40 further includes a plurality of pressing members 45, at least one pressing member 45 is provided on each side of the movable end facing the movable arm 51, and the pressing members 45 abut against the movable arm 51. In the present application, the purpose of the pressing member 45 is mainly to serve as a fulcrum for the lifting of the movable arm 51, so as to ensure that the movable arm 51 can drive the bearing seat 30 to realize a large-stroke movement.

In one particular embodiment of the present application, the extrusions 45 are ball bearings. Of course, in the present application, the extrusion 45 may be provided in other shapes, such as square or cylindrical, etc.

In one embodiment of the present application, as shown in fig. 12, the driving assembly 40 includes an FPC board 411 and a plurality of piezoceramic sheets 47. The FPC board 411 is fixedly connected with the base 20, the FPC board 411 is provided with a fixed end, and the FPC board 411 is electrically connected with the SMA wire 42; each movable arm 51 corresponds to at least one piezoelectric ceramic piece 47, the piezoelectric ceramic pieces 47 are movably arranged on one side of the FPC board 411 far away from the base 20, one end of each piezoelectric ceramic piece 47 is fixedly connected with the FPC board 411, and the other end of each piezoelectric ceramic piece 47 is a movable end and can move relative to the FPC board 411. That is, in the present embodiment, the piezoelectric ceramic sheet 47 is used to replace the elastic sheet 412 and the SMA wire 42, and when the piezoelectric ceramic sheet 47 is powered on, the piezoelectric ceramic sheet 47 deforms and can bend in a direction away from the base 20, so as to drive the extrusion piece 45 to drive the movable arm 51 to swing in the Z-axis direction.

Optionally, the movable end has a receiving slot 46, and at least a portion of the ball is movably disposed within the receiving slot 46.

Optionally, the ball is fixedly disposed on the movable end. Of course, in this embodiment, it is also possible to provide the receiving groove 46 on the movable end and fixedly set the ball inside the receiving groove 46.

Optionally, the ball and the movable end are fixed by glue.

It should be noted that in the above embodiment, the elastic sheet 412 mainly serves as an elastic support, so as to provide a sufficiently stable supporting force for the pressing member 45 to support the movable arm 51 in both force and direction.

Specifically, the elastic piece 412 is made of a metal material.

Preferably, the spring plate 412 is a stainless steel plate.

It should be noted that, in the present application, by the cooperation of the lever plate 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, and further, a large stroke AF driving of the bearing seat 30 is realized, and further, the usability of the optical element driving apparatus is improved.

Specifically, the driving assembly 40 further includes a plurality of jaws 44, and both ends of the SMA wire 42 are connected to the fixed end and the movable end through the jaws 44, respectively. Through such an arrangement, the stability of the connection of the SMA wire 42 with the fixed end and the movable section can be effectively ensured. Also, by this arrangement, the intermediate portion of the SMA wire 42 can be effectively prevented from coming into contact with the spring piece 412 or the FPC board 411.

Specifically, the lever plate assembly 50 includes frames 52, the frames 52 are connected at the corners thereof to the base 20, respectively, and a plurality of movable arms 51 are connected to the inner edges of the frames 52, respectively. In one embodiment of the present application, the frame 52 has a quadrilateral shape, the number of the movable arms 51 is four, and four movable arms 51 are respectively disposed on four inner sides of the frame 52. Stability during movement of the moveable arm 51 is ensured by the provision of a connection that can be made to the base 20 through the corners of the frame 52.

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

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

As shown in fig. 9 and 10, in the present application, when the energization amounts of the plurality of SMA wires 42 are different, the swing distances of the different movable arms 51 corresponding to different SMA wires 42 in the Z axis are different, so that the load bearing seat 30 can be deflected with respect to the Z axis. When the energization amounts of the plurality of SMA wires 42 are the same, the swing distances of the movable arms 51 corresponding to different SMA wires 42 on the Z axis are the same, so that the carriage 30 can move along the Z axis.

Specifically, each corner of the base 20 has at least one positioning post 21 extending toward the bearing seat 30, the positioning post 21 has a lapping surface 211, and the corner of the frame 52 is lapped on the lapping surface 211.

Optionally, the overlapping surface 211 is provided with a guide protrusion 212 extending toward the load-bearing seat 30, and the frame 52 and the load-bearing seat 30 are respectively provided with an escape notch 60 for escaping the guide protrusion 212.

Alternatively, the circumferential side wall of the positioning column 21 has a positioning surface 213 disposed toward the driving assembly 40, and a corner of the FPC board 411 of the driving assembly 40 has a section matched with the positioning surface 213.

Specifically, the optical element driving apparatus further includes a pressing sheet 70, and the pressing sheet 70 is disposed on a side of the carrying seat 30 away from the driving assembly 40 and connected with the positioning column 21 to provide a resetting force for the carrying seat 30 to move toward the driving assembly 40. It should be noted that, in the present application, when the SMA wire 42 is in the non-energized state, a pre-tightening force may be provided to the bearing seat 30 by the pressing sheet 70, so that a balancing force during the movement of the bearing seat 30 along the Z axis can be provided by the pressing sheet 70 after the SMA wire 42 is energized, and a resetting force is provided to the bearing seat 30 after the SMA wire 42 is de-energized.

In one embodiment of the present application, the sheeting 70 comprises: the extrusion part is annular and is abutted against the bearing seat 30; the connecting parts are multiple and correspond to the positioning columns 21 one by one, one ends of the connecting parts are connected with the extrusion parts, and the other ends of the connecting parts are connected with the positioning columns 21.

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. The FPC has the bending section in this application to the tip of bending section has the wiring pin, and gives way breach 11 and is used for dodging the bending section and has the tip of wiring pin. And the wiring pins on the bending section are multiple and correspond to different SMA wires respectively, so that the same or different electric quantities can be introduced into different SMA wires.

Optionally, the housing 10 is made of a plastic material.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

1. the structure is simple, the assembly is easy, the circuit routing is simple, and the circuit is stable.

2. The absence of magnets does not create problems of magnetic interference, either internally or externally.

3. The design problem of a magnetic circuit is avoided, and the average thrust of the whole stroke is larger than that of a magnetoelectric mode and more efficient than that of the magnetoelectric mode.

4. The voice coil motor has no upper spring and lower spring design, and the problems of spring deformation and nickel or foreign matter falling do not occur when the voice coil motor falls and is tested by a roller and the like.

5. The motor housing can be made of plastic, which contributes to the gain of the mobile terminal antenna db.

6. The motor with different appearance structures can be manufactured.

7. The elastic support body can also have the effect of a dustproof ring, and the dustproof effect is better than that of a magnetoelectric mode.

8. The size and area of the finished motor products with the same lens diameter can be smaller than those of the finished motor products with the same lens diameter in a magnetoelectric mode.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (20)

1. An optical element driving apparatus, comprising:

a housing (10);

the shell (10) is covered on the base (20) and forms an accommodating space with the base (20);

the bearing seat (30), the bearing seat (30) is movably arranged in the accommodating space;

the driving assembly (40), the driving assembly (40) is movably arranged on one side of the base (20) facing the bearing seat (30);

a lever plate assembly (50), wherein the lever plate assembly (50) is provided with a plurality of movable arms (51) capable of swinging along the Z-axis direction, the lever plate assembly (50) is arranged between the bearing seat (30) and the driving assembly (40), and the bearing seat (30) is abutted with the lever plate assembly (50);

when the driving assembly (40) is powered on, at least one part of the driving assembly (40) moves relative to the base (20) and drives the movable arm (51) to swing along the Z-axis direction, so that the bearing seat (30) moves along the Z-axis direction or deflects relative to the Z-axis.

2. An optical element driving device according to claim 1, wherein the driving assembly (40) comprises:

the driving structure (41), the driving structure (41) has a plurality of fixed ends and a plurality of movable ends, and the fixed ends are respectively fixedly connected with the base (20);

SMA silk thread (42), SMA silk thread (42) are a plurality of, the one end of SMA silk thread (42) with the stiff end is connected, the other end of SMA silk thread (42) with the expansion end is connected, just SMA silk thread (42) with drive structure (41) electricity is connected, works as SMA silk thread (42) circular telegram back, SMA silk thread (42) shrink and drive the expansion end is followed and is kept away from the direction motion of base (20), the expansion end extrusion movable arm (51) of lever piece subassembly (50), movable arm (51) drive bear seat (30) motion.

3. An optical element driving device according to claim 2, wherein the driving structure (41) comprises:

the FPC board (411) is fixedly connected with the base (20), the FPC board (411) is provided with the fixed end, and the FPC board (411) is electrically connected with the SMA wire (42);

each movable arm (51) corresponds to at least one elastic sheet (412), each elastic sheet (412) is movably arranged on one side, away from the base (20), of the FPC board (411), one end of each elastic sheet (412) is fixedly connected with the FPC board (411), and the other end of each elastic sheet (412) is a movable end and can move relative to the FPC board (411).

4. An optical element driving device according to claim 2, wherein the driving structure (41) comprises an FPC board (411), the FPC board (411) being electrically connected to the SMA wire (42), the FPC board (411) having a plurality of driving arms (4111), the plurality of driving arms (4111) corresponding to the plurality of movable arms (51) one by one, respectively, the driving arms (4111) having the fixed end and the movable end, respectively.

5. The optical element driving apparatus according to claim 4, wherein the driving structure (41) further comprises a plurality of resilient tabs (412), the plurality of resilient tabs (412) respectively correspond to the plurality of driving arms (4111), and the resilient tabs (412) are disposed on a side of the driving arms (4111) close to the base (20).

6. An optical element driving apparatus according to claim 5, wherein a movable gap (43) is provided between the resilient piece (412) and the end of the driving arm (4111) having the fixed end.

7. An optical element driving device according to claim 2, wherein the driving assembly (40) further comprises a plurality of claws (44), and both ends of the SMA wire (42) are connected to the fixed end and the movable end through the claws (44), respectively.

8. An optical element driving device according to claim 2, wherein the driving assembly (40) further comprises a plurality of pressing members (45), each of the movable ends is provided with at least one of the pressing members (45) on a side facing the movable arm (51), and the pressing members (45) abut against the movable arm (51).

9. Optical element driving device according to claim 8, characterized in that the pressing piece (45) is a ball,

the movable end is provided with a containing groove (46), and at least one part of the ball is movably arranged in the containing groove (46); or

The ball is fixedly arranged on the movable end.

10. An optical element driving apparatus according to claim 2, wherein the SMA wire (42) is plural, a plurality of the SMA wires (42), a plurality of the movable arms (51), a plurality of the fixed ends, and a plurality of the movable ends are in one-to-one correspondence, and different ones of the SMA wires (42) correspond to different ones of the fixed ends and different ones of the movable ends, respectively.

11. The optical element driving device according to claim 10, wherein said SMA wire lines (42), said movable arms (51), said fixed ends, and said movable ends are four in number,

the four movable arms (51) are arranged in parallel in pairs, and the two parallel movable arms (51) are vertical to the other two parallel movable arms (51); and/or

In the four SMA wire lines (42), the ends, close to each other, of the two adjacent SMA wire lines (42) are respectively connected with the movable end and the fixed end.

12. An optical element driving device according to claim 11, wherein the driving assembly (40) comprises:

the FPC board (411) is fixedly connected with the base (20), the FPC board (411) is provided with the fixed end, and the FPC board (411) is electrically connected with the SMA wire (42);

a plurality of piezoceramics piece (47), every movable arm (51) correspond at least one respectively piezoceramics piece (47), piezoceramics piece (47) activity sets up FPC board (411) is kept away from one side of base (20), the one end of piezoceramics piece (47) with FPC board (411) fixed connection, the other end of piezoceramics piece (47) is the expansion end and can be relative FPC board (411) motion.

13. The optical element driving device according to any one of claims 1 to 12, wherein the lever plate assembly (50) includes frames (52), the frames (52) are connected at corners thereof to the base (20), respectively, and a plurality of the movable arms (51) are connected to inner edges of the frames (52), respectively.

14. The optical element driving device according to claim 13, wherein a first end of said movable arm (51) is connected to said frame (52), a second end of said movable arm (51) is capable of swinging along the Z-axis, and ends of two adjacent movable arms (51) close to each other are said first end and said second end, respectively.

15. Optical element driving device according to claim 13, characterized in that the base (20) has at each corner at least one positioning post (21) extending towards the carrier (30), the positioning posts (21) having an overlapping surface (211), the corners of the frame (52) overlapping the overlapping surfaces (211).

16. The optical element driving device according to claim 15,

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) are respectively provided with an avoiding notch (60) for avoiding the guide protrusion (212); and/or

The circumferential side wall of the positioning column (21) is provided with a positioning surface (213) which is arranged towards the driving component (40).

17. Optical component driving device according to claim 15, characterized in that it further comprises a pressing tab (70), said pressing tab (70) being arranged on a side of said carrier (30) remote from said driving assembly (40) and being connected to said positioning post (21) for providing a resetting force for said carrier (30) towards said driving assembly (40).

18. Optical element driving device according to any one of claims 1 to 12, characterized in that the circumferential side wall of the housing (10) has a relief notch (11) for avoiding the FPC board (411) of the driving assembly (40).

19. An image pickup apparatus comprising the optical element driving apparatus according to any one of claims 1 to 18.

20. A mobile terminal characterized in that it comprises the camera device of claim 19.

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