TWI452805B - Voice coil motor assembly - Google Patents

Description

Voice coil motor combination

The present invention relates to optical image stabilization technology, and more particularly to a voice coil motor assembly for use in a camera module.

The camera module controls the length of time that the light is projected onto the image sensor through the shutter. For example, when the shutter speed is 1/2 second, the image sensor is sensitive to 1/2 second, if within 1/2 second. Due to the jitter, the same beam of light moves on the image sensor, and the image sensor records the motion of the light, making the captured picture blurred. In order to compensate for the amount of light offset caused by jitter, camera modules using image stabilization systems to prevent jitter began to appear in the 1990s. For details, please refer to the paper "Optical image stabilization for digital cameras" published by Cardani B. et al., April 2006, Control Systems Magazine, IEEE (Volume 26, Issue 2, Page(s): 21-22).

The anti-shake technology of the camera module is mainly divided into two categories: electronic anti-shake and optical anti-shake. Among them, the electronic image stabilization mainly refers to the use of the camera module to force the sensitivity of the image sensor while speeding up the shutter and analyzing the image obtained on about 2/3 of the area on the image sensor, and then using the edge image. The anti-shake technology is compensated, but since some image information is inevitably discarded in the image processing process, the electronic image stabilization technology actually reduces the utilization efficiency of the image sensor.

Optical image stabilization technology can be divided into two types: imaging device anti-shake and lens anti-shake. Imaging device Anti-shake mainly refers to changing the position or angle of the image sensor to maintain the stability of the image after sensing the camera module jitter. However, the anti-shake of the imaging device requires a high-precision mechanism to change the position or angle of the image sensor. The ground greatly increases the manufacturing cost of the camera module. The lens anti-shake mainly refers to setting a special anti-shake compensation lens in the lens module. According to the direction and degree of the camera module, the lens is adjusted to adjust the position and angle to keep the optical path stable, but adding additional compensation lens will increase the camera. The total height of the module in the direction of the optical axis is not conducive to the thinning of the camera module and its promotion on thin and light mobile phones.

In view of the above, it is necessary to provide a voice coil motor combination that does not require a special anti-shake compensation lens, has a simple structure, and can effectively reduce the total height of the camera module in the optical axis direction.

A voice coil motor combination will now be described in the context of a specific embodiment.

A voice coil motor assembly includes a frame, an electromagnetic drive unit, and a voice coil motor housed in the frame, the voice coil motor assembly further comprising a plurality of elastic arms having opposite first and second ends, each a first end of a resilient arm is coupled to the voice coil motor, and a second end is coupled to the frame to resiliently support the voice coil motor to the frame such that the voice coil motor is vertically movable within the frame by the electromagnetic drive unit Moves in the plane of the axial direction of the voice coil motor.

Compared with the prior art, the voice coil motor combination of the present technical solution utilizes a first end of a plurality of elastic arms connected to the voice coil motor, and a second end connected to the frame to elastically support the voice coil motor in the frame, thereby enabling The voice coil motor can be moved in a plane perpendicular to the axial direction of the voice coil motor in the frame by the electromagnetic driving unit, and the voice coil motor itself can drive the lens therein to move in the optical axis direction to focus, so the sound Circle horse The combination has both auto-focus function and camera lens shake correction, and no special anti-shake compensation lens is required. The structure is simple and can effectively reduce the total height of the camera module in the optical axis direction, which is beneficial to the camera. The module is thinner and saves the cost of using anti-shake compensation lenses.

100, 200, 300‧‧‧ voice coil motor combination

10, 210‧‧‧ framework

20‧‧‧Electromagnetic drive unit

30, 230, 330‧‧ ‧ voice coil motor

40‧‧‧Flexible arm

31‧‧‧ movable components

32, 232, 332‧‧‧ fixed components

33‧‧‧First shrapnel

34‧‧‧Second shrapnel

The first side of 301, 401, 501‧‧

302, 402, 502‧‧‧ second side

303, 403, 503‧‧‧ third side

304, 404, 504‧‧‧ fourth side

321‧‧‧First magnetic part

322‧‧‧Second magnetic part

11‧‧‧Top box

12‧‧‧ Lower frame

110, 120‧‧‧ frame

111, 121, 211‧‧‧ first fixed foot

112, 122, 212‧‧‧ second fixed foot

113, 123, 213‧‧‧ third fixed foot

114, 124, 214‧‧‧ fourth fixed foot

1011‧‧‧ card slot

1021‧‧‧Snap bulge

101‧‧‧First Housing Department

102‧‧‧ Second Housing Department

21‧‧‧First magnet assembly

22‧‧‧Second magnet assembly

23‧‧‧First coil assembly

24‧‧‧second coil assembly

41, 241, 311‧‧‧ first elastic arm

42,242,312‧‧‧Second elastic arm

411, 421, 2411, 2421‧‧‧ first elastic part

412, 422, 2412, 2422‧‧‧ second elastic part

331‧‧‧First Extension

341‧‧‧Second extension

1101, 1201‧‧‧ first notch

1102, 1202‧‧‧ second slot

1111, 1211, 201‧‧‧ first bump

1112, 1212, 202‧‧‧ second bump

413‧‧‧Clock Department

4131‧‧‧ bumps

4132, 2401, 2402, 305‧‧‧ engaging holes

313‧‧‧ Third elastic arm

314‧‧‧4th elastic arm

FIG. 1 is a schematic diagram of a voice coil motor assembly provided by a first embodiment of the present technical solution.

Figure 2 is an exploded view of Figure 1.

3 is a schematic view showing the arrangement of a magnet element and a coil element in the first embodiment of the present technical solution.

Fig. 4 is a schematic view showing the energization state of the coil component of the first embodiment of the present technical solution.

FIG. 5 is a schematic diagram of a voice coil motor assembly provided by a second embodiment of the present technical solution.

6 is a schematic view showing the connection between the voice coil motor and the elastic arm of the voice coil motor combination provided by the third embodiment of the present technical solution.

The cooperation of the voice coil motor group of the present technical solution will be further described in detail below with reference to the accompanying drawings and embodiments.

Referring to FIGS. 1 and 2 , the voice coil motor assembly 100 according to the first embodiment of the present invention includes a frame 10 , an electromagnetic drive unit 20 , a voice coil motor 30 housed in the frame 10 , and a plurality of elastic arms 40 . The resilient arm 40 has opposite first and second ends. A first end of each resilient arm 40 is coupled to the voice coil motor 30, and a second end is coupled to the frame 10 to resiliently support the voice coil motor 30 to the frame 10 such that the voice coil motor 30 is drivable at the electromagnetic drive unit 20. The lower movement in the frame 10 is perpendicular to the axial direction of the voice coil motor 30.

The voice coil motor 30 includes a movable member 31, a fixing member 32, and a first elastic piece 33 and a second elastic piece 34 that elastically couple both ends of the movable element 31 to both ends of the fixed member 32, respectively. A lens (not shown) is housed in the movable unit 31. The movable element 31 is housed in the fixed element 32. The movable element 31 is axially movable relative to the fixed element 32 in the voice coil motor 30 to move the lens relative to the fixed element 32 for focusing. The voice coil motor 30 includes a first side 301 and a second side 302 opposite thereto, and a third side 303 and a fourth side 304 opposite thereto. The first side surface 301 and the second side surface 302 are parallel to each other and perpendicular to the first elastic piece 33 and the second elastic piece 34. The third side surface 303 and the fourth side surface 304 are parallel to each other and perpendicular to the first elastic piece 33 and the second elastic piece 34. The first side 301 is perpendicular to the third side 303. The voice coil motor 30 has a first magnetic portion 321 defined inwardly on the first side surface 301 and the second side surface 302 , and a second magnetic portion 322 is defined in the third side surface 303 and the fourth side surface 304 .

The frame 10 includes an upper frame 11 and a lower frame 12. The upper frame 11 includes a frame body 110 and first fixing legs 111, second fixing legs 112, third fixing legs 113, and fourth fixing legs 114 extending perpendicularly to the same side. In this embodiment, the frame body 110 is a square frame body, and the first fixing leg 111, the second fixing leg 112, the third fixing leg 113, and the fourth fixing leg 114 are respectively perpendicular to the frame from the four top corners of the frame body 110. The body 100 extends on the same side.

The lower frame 12 includes a frame body 120 and first fixing legs 121 , second fixing legs 122 , third fixing legs 123 , and fourth fixing legs 124 extending perpendicularly to the same side of the frame body 120 . In this embodiment, the frame 120 is a square frame, and the first fixing leg 121, the second fixing leg 122, the third fixing leg 123, and the fourth fixing leg 124 are respectively perpendicular to the frame from the four top corners of the frame 120. The body 100 extends on the same side.

The first fixing legs 111 and 121 are respectively formed with a matching engaging structure. For example, in the embodiment, a card is formed at one end of the first fixing leg 111 near one side of the center of the frame 110. Slot 1011. Correspondingly, an engaging protrusion 1021 is formed on one side of the end of the second fixing leg 121 near the center of the frame 120. Therefore, when the first fixing legs 111 and 121 are engaged, the engaging protrusion 1021 is engaged in the card slot. 1011. The other fixed legs of the upper frame 11 and the lower frame 12 are similar to the first fixed legs 111 and 121 and will not be described again. In addition, in order to prevent the upper frame 11 and the lower frame 12 from sliding in the horizontal direction, the card slots (or the engaging protrusions) on the fixed legs located at the diagonal positions may be disposed on the same side, for example, in this embodiment. The card slots on the first fixing leg 111 and the third fixing leg 113 are formed on one side of the center of the frame 110. In order to further increase the stability of the engagement between the upper frame 11 and the lower frame 12, the card slots (or the engaging protrusions) on the adjacent fixed legs may be formed on different sides, for example, in this embodiment, The card slot of the first fixing leg 111 is formed on one side of the center of the frame 110, and the card slot of the second fixing leg 112 and the fourth fixing leg 114 is formed on one side of the frame 110.

The first fixing leg 121 , the second fixing leg 122 , the third fixing leg 123 , and the fourth fixing leg 124 of the lower frame 12 are sequentially connected to the first fixing leg 111 , the second fixing leg 112 , and the third fixing leg 113 of the upper frame 11 . The fourth fixing leg 114 is fixedly coupled to form the first receiving portion 101 and the second receiving portion 102. The first housing portion 101 faces the first magnetic portion 321 , and the second housing portion 102 faces the second magnetic portion 322 .

The electromagnetic driving unit 20 includes a first magnet element 21, a second magnet element 22, a first coil element 23 coupled with a magnetic field of the first magnet element 21 to generate an amperage force, and a magnetic field coupled with the second magnet element 22 to generate an amperage force. The second coil element 24. The first magnet element 21 is housed in the first magnetic portion 321 , and the second magnet element 22 is housed in the second magnetic portion 322 . The first magnet element 21 and the second magnet element 22 are perpendicular to each other. The first coil component 23 is housed in the first housing portion 101 , and the second coil component 24 is received in the second housing portion 102 . Of course, the first magnet element 21 and the first coil element 23 can also be used. The second magnet element 22 and the second coil element 24 are interchanged in position.

In this embodiment, there are two first magnet elements 21 and two second magnet elements 22. The two first magnet assemblies 21 are respectively fixed in the two opposite first magnetic portions 321 . The two second magnet elements 22 are respectively fixed in the two parallel magnetic portions 322 which are opposite in parallel. Correspondingly, each of the first magnet assemblies 21 corresponds to a first coil assembly 23, and each of the first magnet elements 21 corresponds to a second coil element 24.

Referring to FIGS. 3 to 4, in the present embodiment, each of the first magnet assemblies 21 includes two coils relative to the first coil assembly 23. The first magnet assembly 21 is a three-stage magnet, and its magnetic poles are arranged in the form of S poles, N poles, and S poles, or are arranged in the manner of N poles, S poles, and N poles. The magnetic poles in the middle of the first magnet assembly 21 are opposite to the two adjacent sides of the two coils, and the two magnetic poles at the two ends are respectively opposed to the two sides away from the two coils. Therefore, when the two coils of the first coil component 23 are respectively clockwise and counterclockwise, the first coil component 23 generates the same amperage direction, and the voice coil motor 30 can be driven in a plane perpendicular to the axial direction thereof. Move inside. Similarly, the second magnet element 22 and the second coil element 24 can also be arranged in the same manner to drive the voice coil motor 30 to move in a plane perpendicular to its axial direction.

In this embodiment, the plurality of elastic arms 40 include two first elastic arms 41 and two second elastic arms 42. The first elastic arm 41 includes a first elastic portion 411 and a second elastic portion 412 extending from one end of the first elastic portion 411. The first elastic portions 411 of the two first elastic arms 41 are respectively connected to opposite sides of the first extending portion 331 and are respectively above the third side surface 303 and the fourth side surface 304 and respectively opposite to the third side surface 303 and the fourth side. Side 304 extends at an acute angle. The second elastic portion 412 of the two first elastic arms 41 is opposite to the second side surface 302 and forms an acute angle with the second side surface 302. Preferably, the acute angle is any angle between 5 and 30 degrees.

The second elastic arm 42 includes a first elastic portion 421 and a second elastic portion 422 extending from one end of the first elastic portion 421 . The first elastic portions 421 of the two second elastic arms 42 are respectively connected to opposite sides of the second extending portion 341, and are respectively above the third side surface 303 and the fourth side surface 304 and respectively opposite to the third side surface 303, The four sides 304 extend at an acute angle. The second elastic portions 422 of the two second elastic arms 42 are opposite to the first side surface 301 and form an acute angle with the first side surface 301. Preferably, the acute angle is any angle between 5 and 30 degrees.

The second end of the elastic arm 40 can be fixed to the frame 10 in various manners, for example, by screw fixing, glue bonding, or by snapping. For example, in this embodiment, the elastic arm 40 is fixed for convenience, and the frame 110 is close to A first notch 1101 is defined in the first fixing leg 111, and a second notch 1102 is opened in the vicinity of the third fixing leg 113. A first bump 1111 is formed on a side opposite to the first fixing leg 111 and the fourth fixing leg 114. A second bump 1112 is formed on a side opposite to the third fixing leg 113 and the second fixing leg 112. A first slot 1201 is defined in the frame 120 near the second fixing leg 122, and a second slot 1202 is defined in the vicinity of the fourth fixing leg 124. A first bump 1211 is formed on a side opposite to the third fixing leg 122 and the third fixing leg 123. A second bump 1212 is formed on a side of the fourth fixing leg 124 opposite to the first fixing leg 121.

In this embodiment, the second elastic portions 412 of the two first elastic arms 41 are respectively formed with protrusions matching the first slots 1101 and 1201 of the upper frame 11 and the lower frame 12, and respectively corresponding to the upper frame 11 and the lower portion. The first protrusions 1111 and 1112 of the frame 12 are matched with the engaging holes, and the second elastic portions 422 of the two second elastic arms 42 are respectively formed with the second slots 1102 and 1202 of the upper frame 11 and the lower frame 12. The matching protrusions and the engaging holes respectively matching the second protrusions 1112 and 1212 of the upper frame 11 and the lower frame 12 are matched. Hereinafter, an elastic arm is taken as an example to illustrate how the elastic arm 40 is engaged with the frame 10.

One end of the second elastic portion 412 connected to the frame 10 has an engaging portion 413. The engaging portion 413 is formed with a protrusion 4131 matching the first notch 1101 of the upper frame 11, and an engaging hole 4132 matching the first protrusion 1111 of the upper frame 11. The protrusion 4131 is engaged with the first notch 1101 , and the engaging hole 4132 is engaged with the first protrusion 1111 , so that the second end of the first elastic arm 41 is coupled to the frame 10 through the engaging portion 413 .

In addition, the combination of the first magnet element 21 and the first coil element 23, the second magnet element 22 and the second coil element 24 is not limited to the above-exemplified manner, and the electromagnetic driving unit 20 may be any other well-known electromagnetic driving combination. The structure only needs to make the direction of the ampere force of the first coil element 23 and the second coil element 24 to be the same, and drive the voice coil motor 30 to move in a plane perpendicular to the axial direction thereof.

Referring to FIG. 5, the voice coil motor assembly 200 provided by the second embodiment of the present technical solution is substantially the same as the voice coil motor assembly 100 provided by the first embodiment, except that the frame 210 of the voice coil motor assembly 200 is integrated. In the formed frame, the elastic arm includes a first elastic arm 241 and a second elastic arm 242. The first elastic arm 241 and the second elastic arm 242 are fixed to the fixing component 232 of the voice coil motor 230. The voice coil motor 230 includes a first side 401 and a second side 402 opposite thereto, and a third side 403 and a fourth side 404 opposite thereto.

The frame 210 has a first fixing leg 211, a second fixing leg 212, a third fixing leg 213 and a fourth fixing leg 214. A first bump 201 is formed on a side opposite to the first fixing leg 211 and the fourth fixing leg 214. A second bump 202 is formed on a side opposite to the third fixing leg 213 and the second fixing leg 212.

The first elastic arm 241 includes a first elastic portion 2411 and a second elastic portion 2412 extending from one end of the first elastic portion 2411. One end of the first elastic portion 2411 is coupled to the fixing member 232 of the voice coil motor 230. The second elastic portion 2412 is formed with the first bump 201 matching snap hole 2401. The first elastic portion 2411 extends over the fourth side surface 404 and forms an acute angle with the fourth side surface 404. The second elastic portion 2412 and the second side surface 402 extend at an acute angle with the second side surface 402.

The second elastic arm 242 includes a first elastic portion 2421 and a second elastic portion 2422 extending from one end of the first elastic portion 2421. The first elastic portion 2421 and the second elastic portion 2422 of the second elastic arm 242 are opposed to the first elastic portion 2411 and the second elastic portion 2412 of the first elastic arm 241, respectively. The first elastic portion 2421 is coupled to the fixing member 232 of the voice coil motor 230. The second elastic portion 2422 is formed with an engaging hole 2402 that matches the second bump 202. The first elastic portion 2421 extends above the third side surface 403 and forms an acute angle with the third side surface 403. The second elastic portion 2422 is opposite to the first side surface 401 and extends at an acute angle with the first side surface 401.

Therefore, the engaging hole 2401 of the first elastic arm 241 is engaged with the first protrusion 201, and the engaging hole 2402 of the second elastic arm 242 is engaged with the second protrusion 202, so that the first elastic arm 241 and the second elastic body The arm 242 can elastically support the voice coil motor 230 within the frame 210.

Referring to FIG. 6, the voice coil motor assembly 300 provided by the third embodiment of the present technical solution is substantially the same as the voice coil motor assembly 200 provided by the second embodiment, except that the voice coil motor assembly 300 includes a first The elastic arm 311, the second elastic arm 312, the third elastic arm 313 and the fourth elastic arm 314, the first elastic arm 311, the second elastic arm 312, the third elastic arm 313 and the fourth elastic arm 314 are both One paragraph. The first ends of the first elastic arm 311, the second elastic arm 312, the third elastic arm 313 and the fourth elastic arm 314 are connected and fixed to the fixing element 332 of the voice coil motor 330.

The voice coil motor 330 includes a first side 501 and a second side 502 opposite thereto, and a third side 503 and a fourth side 504 opposite thereto. The first elastic arm 311 extends above the first side 501 and forms an acute angle with the first side 501, and the second elastic arm 312 is on the second side. The second elastic arm 313 extends above the third side surface 503 and extends at an acute angle with the third side surface 503. The fourth elastic arm 314 is above the fourth side surface 504 and the fourth side surface 504. An acute angle extends.

The second elastic arm 311, the second elastic arm 312, the third elastic arm 313 and the second end of the fourth elastic arm 314 are each formed with an engaging hole 305.

The engaging holes 305 of the first elastic arm 311, the second elastic arm 312, the third elastic arm 313 and the fourth elastic arm 314 can respectively engage with the matching protrusions (not shown) on the frame, so that the first elasticity The arm 311, the second resilient arm 312, the third resilient arm 313, and the fourth resilient arm 314 can elastically support the voice coil motor 330 within the frame.

In addition, the plurality of elastic arms of the voice coil motor combination may have other shapes and structures, and the frame may have other shapes and structures, and only the first end of the plurality of elastic arms is connected to the voice coil motor, and the first end Attached to the frame, the voice coil motor is resiliently supported on the frame such that the voice coil motor can be moved within the frame perpendicular to the axial direction of the voice coil motor driven by the electromagnetic drive unit.

Compared with the prior art, the voice coil motor combination of the present technical solution utilizes a plurality of elastic arms connected to the voice coil motor at one end and the other end connected to the frame to elastically support the voice coil motor in the frame, thereby making the voice coil motor It can be moved in the plane perpendicular to the axial direction of the voice coil motor under the driving of the electromagnetic driving unit, and the voice coil motor itself can drive the lens therein to move in the optical axis direction to focus, so the voice coil motor combination is With auto-focus function, it can correct the camera module's jitter, and no special anti-shake compensation lens is needed. The structure is simple and can effectively reduce the total height of the camera module in the optical axis direction, which is beneficial to the camera module. It is thinner and saves the cost of using anti-shake compensation lenses.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧ voice coil motor combination

20‧‧‧Electromagnetic drive unit

30‧‧‧ voice coil motor

40‧‧‧Flexible arm

31‧‧‧ movable components

32‧‧‧Fixed components

33‧‧‧First shrapnel

34‧‧‧Second shrapnel

301‧‧‧ first side

302‧‧‧ second side

303‧‧‧ third side

304‧‧‧ fourth side

321‧‧‧First magnetic part

322‧‧‧Second magnetic part

11‧‧‧Top box

12‧‧‧ Lower frame

110, 120‧‧‧ frame

111, 121‧‧‧ first fixed foot

112, 122‧‧‧ second fixed foot

113, 123‧‧‧ third fixed foot

114, 124‧‧‧Four fixed feet

1011‧‧‧ card slot

1021‧‧‧Snap bulge

21‧‧‧First magnet assembly

22‧‧‧Second magnet assembly

23‧‧‧First coil assembly

24‧‧‧second coil assembly

41‧‧‧First elastic arm

42‧‧‧Second elastic arm

411, 421‧‧‧ first elastic part

412, 422‧‧‧Second elastic part

331‧‧‧First Extension

341‧‧‧Second extension

1101, 1201‧‧‧ first notch

1102, 1202‧‧‧ second slot

1111, 1211‧‧‧ first bump

1112, 1212‧‧‧ second bump

413‧‧‧Clock Department

4131‧‧‧ bumps

4132‧‧‧Snap hole

Claims (9)

A voice coil motor assembly includes a frame, an electromagnetic drive unit, and a voice coil motor housed in the frame, wherein the voice coil motor assembly includes a plurality of elastic arms and two elastic pieces, one end of each of the elastic pieces being An extension extending above a side of the voice coil motor, the resilient arm having opposite first and second ends, a first end of each resilient arm being coupled to the extension, the second end being coupled to the frame for the sound The ring motor is elastically supported on the frame such that the voice coil motor is movable in a plane perpendicular to the axial direction of the voice coil motor within the frame by the electromagnetic drive unit, and one end of each of the elastic arms corresponds to the elastic arm Renyi Rui plane extends at an angle to between ⁵⁰ ~ ^300. The voice coil motor assembly of claim 1, wherein the voice coil motor comprises a fixing component and a movable component received in the fixing component, and the fixing component and the movable component are elastically connected by the two elastic pieces. The voice coil motor assembly of claim 2, wherein the first side and the second side are parallel to each other and perpendicular to the first elastic piece and the second elastic piece. The voice coil motor assembly of claim 2, wherein the voice coil motor includes an opposite third side and a fourth side, the plurality of elastic arms including two first elastic arms and two second elastic arms The first elastic arm and the second elastic arm each include a first elastic portion and a second elastic portion extending from one end of the first elastic portion, and the first elastic portions of the two first elastic arms respectively An extension portion is connected to the opposite sides, and the first elastic portions of the two second elastic arms are respectively connected to opposite sides of the second extension portion. The voice coil motor assembly of claim 1, wherein the second end of the plurality of elastic arms is fixed by screws, glued, or snapped to the frame. The voice coil motor assembly of claim 4, wherein the frame comprises an upper frame and a lower frame, the upper frame and the lower frame each comprise a frame body and the frame is vertically oriented from the four top corners of the frame body. Body identity a first fixing leg, a second fixing leg, a third fixing leg and a fourth fixing leg extending laterally, wherein the upper frame and the lower frame respectively correspond to the two first fixing legs, the two second fixing legs, and the two The engaging and engaging structures formed by the third fixing leg and the two second fixing legs are respectively engaged. The voice coil motor assembly of claim 7, wherein the frame of the upper frame is provided with a first slot near the first fixed leg, and a second slot is opened adjacent to the third fixed leg. a first protrusion is formed on a side opposite to the first fixing leg and the fourth fixing leg, and a second protrusion is formed on a side opposite to the second fixing leg of the upper frame; the lower frame a first slot is formed in the frame near the second fixed leg, and a second slot is opened near the fourth fixed leg. The second fixed leg of the lower frame is formed on the opposite side of the third fixed leg. a second bump is formed on a side of the fourth fixing leg of the lower frame opposite to the first fixing leg, and the second elastic portions of the two first elastic arms are respectively formed with the upper frame and the lower frame a slot matching the protrusion and a matching hole respectively matched with the first protrusion of the upper frame and the lower frame, and the second elastic portions of the two second elastic arms are respectively formed with the upper frame and the lower frame The second notch matches the protrusion and the matching hole respectively matching the second protrusion of the upper frame and the lower frame. The voice coil motor assembly of claim 1, wherein the second end of each elastic arm is formed with an engaging hole, and the frame is formed with a convex shape respectively matching the engaging hole of each elastic arm. The block, the engaging holes of each elastic arm are respectively engaged with the corresponding bumps. The voice coil motor assembly of claim 1, wherein the voice coil motor includes a first side and a second side opposite to each other, and a third side and a fourth side opposite to each other, the plurality of elastic arms including a first a resilient arm, a second resilient arm, a third resilient arm and a fourth resilient arm, the first resilient arm extending above the first side and at an acute angle to the first side, the second resilient arm being on the second side The upper portion extends at an acute angle to the second side surface. The third elastic arm extends above the third side surface at an acute angle to the third side surface. The fourth elastic arm extends above the fourth side surface and forms an acute angle with the fourth side surface.