CN215344777U - OIS actuator - Google Patents

Abstract

The utility model relates to an OIS actuator, including the base that installs optical device, install optical device and can be for the mount pad of base motion, and the elastic construction of elastic connection between mount pad and base, elastic construction is used for supporting mount pad elastic support in the base, be provided with the coil on the mount pad, be provided with the magnetite on the base, in order to drive coil along first direction motion after the coil circular telegram, the magnetic pole direction of magnetite distributes along the direction of perpendicular to first direction, the both sides of magnetite along the magnetic pole direction are provided with first magnetic part, both sides along the first direction are provided with the second magnetic part, a first magnetic part is surrounded to the coil, and the annular face of coil is perpendicular to first direction. The elastic structure can support the mounting seat and simultaneously relieve vibration generated during movement of the mounting seat, and can realize return of the coil driving the mounting seat after power failure, thereby saving energy consumption. The coil arranged in the closed magnetic circuit can be subjected to larger driving force so as to meet the requirement of large stroke.

Description

OIS actuator

Technical Field

The present disclosure relates to the field of optical technology, and in particular, to an OIS actuator.

Background

The optical system is a system for imaging or optical information processing, and can be applied to various fields, such as a camera of a mobile phone, a camera or a lens of a projection technology, and as the application of the optical system is more extensive, a user more seeks an imaging high-definition optical system. In the related art, a voice coil type motor is mostly adopted in a conventional optical device, and the optical device is moved by utilizing the principle that an electrified coil receives ampere force in a magnetic field. However, when the stroke of the optical device is large, the magnet has an edge effect, and the electromagnetic force at the two ends is insufficient. In addition, factors such as instability in the movement process of the optical device, overlarge movement acceleration caused by ampere force and the like can cause poor optical anti-shake effect, and the imaging effect is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide an OIS actuator to at least partially solve the problems in the related art.

In order to achieve the above object, the present disclosure provides an OIS actuator, including a base on which an optical device is mounted, a mount on which the optical device is mounted and which is capable of moving relative to the base, and an elastic structure elastically connected between the mount and the base, the elastic structure being configured to elastically support the mount on the base, the mount being provided with a coil, the base being provided with a magnet so as to drive the coil to move along a first direction after the coil is energized, a magnetic pole direction of the magnet being distributed along a direction perpendicular to the first direction, both sides of the magnet along the magnetic pole direction being provided with first magnetic members, both sides along the first direction being provided with second magnetic members, the coil surrounding one of the first magnetic members, and a ring-shaped surface of the coil being perpendicular to the first direction.

Optionally, the elastic structure includes a first connection portion connected to the mounting base, a second connection portion connected to the base, and an elastic deformation portion connected between the first connection portion and the second connection portion.

Optionally, the elastic deformation portion includes a plurality of spring wires connected between the first connection portion and the second connection portion and disposed at intervals.

Optionally, the first connecting portion includes a square frame connected to the mounting base and having a central symmetry with respect to the mounting base, and two first connecting pieces formed on one opposite side of the square frame, and the second connecting portion includes two second connecting pieces located on the other opposite side of the square frame, and each of the first connecting pieces and each of the second connecting pieces are connected by a plurality of the spring wires.

Optionally, the elastically deforming part includes a spring wire that is meanderingly arranged between the first connecting part and the second connecting part.

Optionally, the first connecting portion includes a square frame connected to the mounting base and symmetric about the center of the mounting base, and four third connecting pieces formed on four sides of the square frame, the second connecting portion includes four fourth connecting pieces evenly distributed in the circumferential direction of the square frame, and each of the third connecting pieces is connected to the corresponding fourth connecting piece through the spring wire.

Optionally, the number of the magnets is two, two of the magnets are arranged at intervals along the magnetic pole distribution direction, the first magnetic part is arranged on both sides of the two of the magnets along the magnetic pole distribution direction, and the coil surrounds the first magnetic part between the two of the magnets.

Optionally, the magnetic poles of the two magnets are distributed in opposite directions, and are both located inside the coil or both located outside the coil.

Optionally, two sides of each of the two magnets in the first direction are provided with a second magnetic part, and the first magnetic part and the second magnetic part form a shape of a Chinese character 'ri'.

Optionally, the first magnetic member and the second magnetic member are integrally formed.

Through the technical scheme, the elastic structure arranged between the base and the mounting seat can support the mounting seat and simultaneously relieve vibration generated by factors such as overlarge speed and the like when the mounting seat moves, and the coil can be returned to drive the mounting seat after power failure, so that energy consumption is saved. And the magnetic parts are arranged on four sides of the magnet, and the coil is wound on the magnetic part on one side, so that one side of the coil is positioned in the area surrounded by the magnetic parts. Because the magnetic line of force of magnetite can be retrained to the magnetic part, consequently can be so that the magnetic circuit of magnetite is closed, like this, the one side coil that sets up in closed magnetic circuit can receive great drive power to satisfy optical device's big stroke demand.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic structural diagram of an OIS actuator provided in an exemplary embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of an OIS actuator provided in another exemplary embodiment of the present disclosure;

FIG. 3 is a schematic view of the spring structure shown in FIG. 1;

FIG. 4 is a schematic view of the spring structure shown in FIG. 2;

FIG. 5 is a schematic diagram of an arrangement of a coil and a magnet provided in an exemplary embodiment of the present disclosure;

FIG. 6 is a magnetic flux distribution plot for the embodiment of FIG. 5;

FIG. 7 is a schematic view of a coil and magnet arrangement provided in another exemplary embodiment of the present disclosure;

FIG. 8 is a magnetic flux distribution plot for the embodiment of FIG. 7;

FIG. 9 is a schematic view of a coil and magnet arrangement provided in another exemplary embodiment of the present disclosure;

FIG. 10 is a magnetic flux distribution plot for the embodiment of FIG. 9;

FIG. 11 is a schematic view of a coil and magnet arrangement provided in another exemplary embodiment of the present disclosure;

FIG. 12 is a magnetic flux distribution plot for the embodiment of FIG. 11;

fig. 13 is an assembly view of an OIS actuator provided in an exemplary embodiment of the present disclosure.

Description of the reference numerals

100-image sensor, 10-base, 11-base, 12-base, 121-protrusion, 20-mounting base, 21-mounting block, 30-magnet, 40-coil, 50-elastic structure, 51-first connecting part, 511-square frame, 512-first connecting piece, 513-third connecting piece, 52-second connecting part, 521-second connecting piece, 522-fourth connecting piece, 53-elastic deformation part, 61-first magnetic part, 62-second magnetic part.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, the use of directional terms such as "inner and outer" is intended with respect to the proper contours of the respective parts, unless otherwise specified. In addition, the terms "first, second, and the like" used in the embodiments of the present disclosure are for distinguishing one element from another, and have no order or importance. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

Referring to fig. 1 and 2 and 13, the present disclosure provides an OIS actuator for correcting an optical axis deviation, the OIS actuator including a base 10 on which an optical device is mounted, a mount 20 on which the optical device is mounted and which is movable relative to the base 10, and an elastic structure 50 elastically connected between the mount 20 and the base 10, the base 10 may include a base 11 on which a magnet 30, a coil 40, and the like, which will be described below, are mounted, and a base 12 disposed at the bottom of the base 11, and the mount 20 may be accommodated in a space surrounded by the base 11 and the base 12 and suspended above the base 12 by the elastic structure 50. Here, the optical device may include a mirror portion (not shown in the drawings) and the image sensor 100, the mirror portion may be mounted on the base 10, and the image sensor 100 may be mounted on the mount 20, at least one of the base 10 and the mount 20 may be movable, such as the base 10 being fixed and the mount 20 being movable, or vice versa, or both may be movable. The elastic structure 50 is used to elastically support the mounting seat 20 on the base 10, so that the elastic structure 50 can elastically deform when the mounting seat 20 moves, and after the movement is finished, the elastic structure 50 can elastically reset to provide a resetting force for the mounting seat 20. Wherein the elastic mechanism 50 is configured to enable the base 10 and the mounting seat 20 to have a space in a direction perpendicular to the first direction after being mounted, so that the mounting seat 20 can move relative to the base 10 along the first direction.

In the embodiment of the present disclosure, when the mounting base 20 moves, the coil 40 may be disposed on the mounting base 20, the mounting block 21 for mounting the coil 40 may be disposed on the mounting base 20, and the magnet 30 is disposed on the base 10, and the weight of the coil 40 is lighter than that of the magnet 30, so that the mass of the moving portion may be reduced during the movement, thereby ensuring the driving force. The coil 40 is energized to generate an ampere force in the magnetic field of the magnet 30, thereby driving the coil 40 to move in a first direction, which may include, but is not limited to, the up-down direction and the left-right direction in the plane of the drawings of fig. 3 and 4. The magnetic pole directions of the magnets 30 are distributed in a direction perpendicular to the first direction, and when the first direction includes the above-described up-down direction and left-right direction, the magnetic poles may be distributed in a direction perpendicular to the paper surface. The magnet 30 is provided with first magnetic members 61 on both sides in the magnetic pole direction and second magnetic members 62 on both sides in the first direction, wherein the second magnetic members 62 near the inside of the actuator are omitted in fig. 1 and 2 for convenience of illustration. The coil 40 surrounds one first magnetic member 61, and the annular surface of the coil 40 is perpendicular to the first direction, i.e., the direction of the annular surface is perpendicular to the left-right direction of the drawing of fig. 5 to 12.

Through the technical scheme, the elastic structure 50 arranged between the base 10 and the mounting seat 20 can support the mounting seat 20 and simultaneously relieve the vibration generated by factors such as overlarge speed and the like when the mounting seat 20 moves, and the coil 40 can drive the mounting seat 20 to return after power failure, so that energy consumption is saved. Magnetic members are provided on four sides of the magnet 30, and the coil 40 is wound around one of the magnetic members such that one side of the coil 40 is located in an area surrounded by the magnetic members. Because the magnetic force line of the magnet 30 can be restrained by the magnetic part, the magnetic circuit of the magnet 30 can be closed, and thus, the coil 40 arranged on one side in the closed magnetic circuit can be subjected to larger driving force so as to meet the requirement of large stroke of an optical device.

In the present disclosure, referring to fig. 1 and 2, the elastic structure 50 may include a first connection portion 51 connected to the mounting base 20, a second connection portion 52 connected to the base 10, and an elastic deformation portion 53 connected between the first connection portion 51 and the second connection portion 52. When the mounting base 20 moves, the elastic deformation portion 53 deforms, and after the movement is finished, the external force applied to the elastic deformation portion 53 is removed, so that the elastic deformation portion can be restored to the initial state under the action of the elastic force of the elastic deformation portion, and the first connecting portion 51 connected with the elastic deformation portion drives the mounting base 20 to return to the initial position relative to the base 10, so as to prepare for the next action. The elastic deformation portion 53 also prevents the OIS actuator from being arbitrarily shaken to generate abnormal noise or impact damage when the mount 20 is not in use.

Specifically, referring to fig. 3, the elastic deformation portion 53 may include a plurality of spring wires connected between the first connection portion 51 and the second connection portion 52 and spaced apart from each other. The spring wire can be in a plane straight line form shown in fig. 3, or in a serpentine or non-plane form, and the stability of connection can be enhanced by arranging a plurality of spring wires, so that the spring wire can be conveniently reset after being deformed. When the mounting base 20 moves, the spring wire can generate deflection deformation to adapt to the movement.

Further, the first connection portion 51 may include a frame 511 connected to the mount 20 and centrally symmetrical with respect to the mount 20, and two first connection pieces 512 formed at one opposite side of the frame 511, and the second connection portion 52 includes two second connection pieces 521 located at the other opposite side of the frame 511, and each first connection piece 512 and each second connection piece 521 are connected by a plurality of spring wires. Referring to fig. 1 and 3, block 511 may be attached to image sensor 100 or directly to mounting base 20, for example, block 511 is attached between the top surface of image sensor 100 and the bottom surface of mounting base 20, first connecting piece 512 may be attached to the surface of mounting base 20 by bonding or other means, and second connecting piece 521 may be attached to protrusion 121 of base 12 by bonding or other means. The connecting area can be increased by connecting the connecting pieces in a mode, so that the connecting effect is better.

In another embodiment, referring to fig. 4, the elastic deformation portion 53 may further include a spring wire that is meanderingly disposed between the first connection portion 51 and the second connection portion 52. For example, when the first direction includes a left-right direction and an up-down direction as shown in the drawing of fig. 4, the winding direction of the spring wire may include extensions in the up-down and left-right directions, such as the spring wire shown in the upper right corner of fig. 4, which extends first to the left from the fourth connecting piece 522 to be drawn out later and then winds to the right, then extends downward and winds upward and returns to extend downward to the third connecting piece 513 to be drawn out later. By such a winding arrangement, the winding area can provide a sufficient amount of deformation for the movement of the mounting seat 20 and is easy to recover after deformation when the mounting seat 20 moves. In the present disclosure, a plurality of such zigzag wires may be provided at intervals as described above.

Further, in this embodiment, the first connection portion 51 may include a block 511 connected to the mounting seat 20 and centrally symmetrical with respect to the mounting seat 20, and four third connection pieces 513 formed at four circumferential sides of the block 511, and the second connection portion 52 includes four fourth connection pieces 522 uniformly distributed in a circumferential direction of the block 511, and each of the third connection pieces 513 is connected to the corresponding fourth connection piece 522 by the zigzag spring wire. Referring to fig. 2 and 4, the block 511 and the third connecting piece 513 may be connected in the same manner as the above-described embodiment, i.e., between the top surface of the image sensor 100 and the bottom surface of the mounting base 20, and four fourth connecting pieces 522 may be connected to the four protrusions 121 of the base 12.

According to an embodiment of the present disclosure, referring to fig. 5 to 8, the number of the magnets 30 may be one, the cross section surrounded by the first magnetic member 61 and the second magnetic member 62 may be configured in a square shape, the coil 40 is wound on the first magnetic member 61 on the upper side or the lower side of the magnet 30, and fig. 6 and 8 show the distribution of magnetic lines of force corresponding to the embodiments of fig. 5 and 7, respectively.

In another embodiment, the number of the magnets 30 may be two, and referring to fig. 9 to 12, the two magnets 30 are spaced apart from each other in the magnetic pole distribution direction (i.e., the vertical direction in the drawing), the first magnetic members 61 are disposed on both sides of the two magnets 30 in the magnetic pole distribution direction, and the coil 40 surrounds the first magnetic member 61 located between the two magnets 30. This arrangement makes it possible to engage one coil 40 with two magnets 30, thereby increasing the driving force of the entire motor.

Specifically, the magnetic poles of the two magnets 30 are distributed in opposite directions, i.e., the magnetic poles of one magnet 30 are distributed in an up-N-down-S manner, and the magnetic poles of the other magnet 30 are distributed in an up-S-down-N manner, so that the directions of the forces exerted on the coil 40 between the two magnets 30 are consistent according to the left-hand rule, and are all left or right. As shown in fig. 11, the two magnets 30 may be both located inside the coil 40, i.e., the coil 40 may surround the first magnetic member 61 in the middle and the two magnets 30, and fig. 12 shows the magnetic flux distribution pattern of the arrangement of fig. 11; alternatively, in other embodiments, referring to fig. 9, both the magnets 30 may be located outside the coil 40, i.e., the magnets 30 may be respectively disposed on the first magnetic members 61 on both sides opposite to the middle first magnetic member 61, the coil 40 surrounds only the middle first magnetic member 61, and fig. 10 shows the magnetic flux distribution pattern of this arrangement of fig. 9. As can be seen from fig. 9 to 12, the magnet 30 disposed inside the coil 40 increases the size of the coil 40, but the distribution of the magnetic lines of force is more restricted, and in practical applications, an appropriate arrangement may be selected according to the needs.

When two magnets 30 are provided, referring to fig. 9 to 12, the second magnetic members 62 are provided on both sides of the two magnets 30 in the first direction, respectively, and the first magnetic member 61 and the second magnetic member 62 may be formed in a shape of a Chinese character 'ri'. The zigzag structure may be formed by superimposing two rectangular structures, or may be formed by adding a magnetic member between the rectangular structures, in other words, the thickness of the first magnetic member 61 between the two magnets 30 may be twice or the same as the thickness of the magnetic member on the other side of the magnets 30.

In one embodiment, the first magnetic member 61 and the second magnetic member 62 may be integrally formed to provide a strong integrity of the magnetic members. In other embodiments, the magnetic member may be a separate combination type structure, for example, a combination of two square magnetic members, or a combination of one or several sides of a rectangular magnetic member, and the combination may be an adhesive method.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. An OIS actuator is characterized by comprising a base (10) provided with an optical device, a mounting seat (20) provided with the optical device and capable of moving relative to the base (10), and an elastic structure (50) elastically connected between the mounting seat (20) and the base (10), wherein the elastic structure (50) is used for elastically supporting the mounting seat (20) on the base (10), a coil (40) is arranged on the mounting seat (20), a magnet (30) is arranged on the base (10) so as to drive the coil (40) to move along a first direction after the coil (40) is electrified, the magnetic pole direction of the magnet (30) is distributed along the direction vertical to the first direction, first magnetic parts (61) are arranged on two sides of the magnet (30) along the magnetic pole direction, and second magnetic parts (62) are arranged on two sides of the magnet (30) along the first direction, the coil (40) surrounds one of the first magnetic members (61), and an annular face of the coil (40) is perpendicular to the first direction.

2. The OIS actuator of claim 1, in which the resilient structure (50) comprises a first connection (51) to the mount (20), a second connection (52) to the base (10), and a resiliently deformable portion (53) connected between the first connection (51) and the second connection (52).

3. The OIS actuator of claim 2 in which the resiliently deformable portion (53) comprises a plurality of spaced apart spring wires connected between the first and second connection portions (51, 52).

4. The OIS actuator according to claim 3, wherein the first connection portion (51) comprises a frame (511) connected to the mount (20) and centrally symmetrical with respect to the mount (20) and two first connection pieces (512) formed at one opposite side of the frame (511), and the second connection portion (52) comprises two second connection pieces (521) located at the other opposite side of the frame (511), and each of the first connection pieces (512) and each of the second connection pieces (521) are connected by a plurality of the spring wires.

5. The OIS actuator of claim 2 in which the resiliently deformable portion (53) comprises a wire which is sinuously arranged between the first connection portion (51) and the second connection portion (52).

6. The OIS actuator according to claim 5, characterized in that the first connection portion (51) comprises a square frame (511) connected to the mount (20) and centrally symmetrical with respect to the mount (20) and four third connection pieces (513) formed at four circumferential sides of the square frame (511), the second connection portion (52) comprises four fourth connection pieces (522) evenly distributed in a circumferential direction of the square frame (511), and each of the third connection pieces (513) is connected to the corresponding fourth connection piece (522) by the wire spring.

7. The OIS actuator of claim 1 wherein there are two magnets (30), two magnets (30) are provided at intervals in the direction of magnetic pole distribution, and the first magnetic member (61) is provided on both sides of the two magnets (30) in the direction of magnetic pole distribution, and the coil (40) is wound around the first magnetic member (61) between the two magnets (30).

8. The OIS actuator of claim 1, in which the two magnets (30) have their poles distributed in opposite directions and are either both located inside the coil (40) or both located outside the coil (40).

9. The OIS actuator of claim 7 or 8 in which the two magnets (30) are provided with second magnetic members (62) on both sides in the first direction, the first magnetic member (61) and the second magnetic member (62) forming a chevron.

10. The OIS actuator of claim 1, in which the first magnetic member (61) and the second magnetic member (62) are integrally formed.

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