TWI454023B - Magnetic conducting appratus and voice coil motor - Google Patents

Description

Magnetic guiding device and voice coil motor

The present invention relates to a magnetic permeability device and a voice coil motor, and more particularly to a magnetic permeability device capable of providing concentrated distribution of magnetic lines of force and a voice coil motor having the same.

The traditional voice coil motor has the advantages of small size, low power consumption and low price, and is suitable as an actuator in electronic products (such as digital cameras, mobile phones, digital cameras, etc.). Referring to FIG. 1, FIG. 1 is a schematic structural view of a conventional voice coil motor. The voice coil motor 1 mainly includes a fixed assembly 10 and a movable assembly 12, wherein the movable assembly 12 is movably mounted in the fixed assembly 10. The movable component 12 includes a lens carrier 120 and a coil 122, wherein the coil 122 is wound around the periphery of the lens carrier 120. The aforementioned lens carrier 120 is used to mount a lens.

The fixing component 10 has a magnetic yoke 102 and four magnets 104 respectively fixed at four corners of the magnetic guiding frame 102. The magnetic guiding frame 102 is used to guide the magnetic lines Φ generated by the magnet 104, so that the magnetic lines of force Φ can be effectively Acting with the coil 122 under energization, thereby driving the movable assembly 12. That is to say, when the coil 122 is energized, it interacts with the magnetic field generated by the magnet 104 to force, thereby driving the lens carrier 120 to move along the central axis PX thereof, thereby changing the lens mounted on the movable component 12. The distance between the image sensor and the image sensor (CCD) enables focus or zoom.

However, the arrangement of the magnetic conductive frame 102 limits the development of the miniaturization of the voice coil motor 1. At the same time, the magnetic conductive frame 102 provides a magnetic circuit with a long magnetic field line Φ, so that the magnetic force line Φ generated by the magnet 104 cannot be completely connected with the coil under the energization. 122 acts, thus causing a waste of magnetic lines of force Φ.

In addition, the magnet 104 is adhered only to the inner wall of the fixed base 13 of the voice coil motor 1 by glue, so that the glue may fall off as the use time increases, resulting in deterioration of stability between the magnet 104 and the fixed base 13, thereby causing The stability of the voice coil motor 1 is deteriorated, the magnetic properties are deteriorated, and the performance is lowered.

In view of this, the magnetic guiding device of the embodiment of the present invention is used in a voice coil motor, wherein the magnetic guiding device of the embodiment of the present invention is composed of a magnet and a magnetic conductive member.

According to an embodiment, the magnetic guiding device of the present invention comprises a non-annular magnet cylinder and a magnetic conductive member, wherein a top surface of the non-annular magnet cylinder is disposed opposite to the bottom surface, and the first side is opposite to the second side and has a phase Different polarity. At the same time, the magnetic conductive member has a top plate, a bottom plate and a side plate, wherein the side plate is connected between the top plate and the bottom plate. The top plate of the magnetic conductive member covers the top surface of the non-annular magnet column, the bottom plate of the magnetic conductive member covers the bottom surface of the non-annular magnet column, and the side plate of the magnetic conductive member covers the first side surface of the non-annular magnet column.

According to another embodiment, the voice coil motor of the present invention includes a movable assembly, a fixed base, and at least two magnetically permeable devices. The fixing base has a receiving cavity and at least two magnetic parts, wherein the receiving cavity is for receiving the movable component. The magnetic guiding device is disposed in the corresponding magnetic portion, wherein the magnetic guiding device comprises a non-annular magnet cylinder and a magnetic conductive member, and the structural composition is the same as that of the magnetic guiding device of the foregoing embodiment.

In summary, the magnetic guiding device of the embodiment of the present invention can reduce the occurrence of invalid magnetic lines of force by the structure of the non-annular magnet cylinder and the magnetic conductive member, and generate a dense and short distance effective magnetic line and the coil under the energization. A magnetic field occurs. As such, the magnetic guiding device of the embodiment of the present invention can improve the stability of the voice coil motor, enhance the electromagnetic thrust of the voice coil motor, reduce the size of the voice coil motor, and improve the overall performance of the voice coil motor.

At the same time, the magnetic guiding device of the embodiment of the present invention is disposed in the magnetic portion of the fixed base, which is not separated from the fixed base due to factors such as increased use time or external force, thereby effectively improving the overall voice coil motor. Stability, magnetic properties and performance.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

Referring to FIG. 2A, FIG. 2A is a schematic diagram showing the appearance of a magnetic guiding device according to an embodiment of the present invention. The magnetic guiding device 2 is used in a voice coil motor (not shown in Fig. 2A) and is used to interact with a coil (not shown in Fig. 2A) energized in the voice coil motor to generate the amount of actuation force required for the voice coil motor. .

Refer to Figure 2A for details. The magnetic guiding device 2 includes a non-annular magnet cylinder 20 and a magnetic conductive member 22, which are assembled by a combination of the non-annular magnet cylinder 20 and the magnetic conductive member 22. The magnetic conductive member 22 covers the non-annular magnet cylinder 20 as a path through which magnetic lines of force generated by the magnet 20 flow, and the magnetic lines of force can be concentrated. In the foregoing, the non-annular magnet cylinder 20 and the magnetic conductive member 22 may be combined and combined by means of gluing, tight fitting or magnetic attraction. However, such a joining manner is not a limitation of the present invention, and a non-annular magnet cylinder can be used. Both the 20 and the magnetically permeable members 22 can be used to practice the invention.

Refer to Figure 2A for details. The non-annular magnet cylinder 20 of the embodiment of the present invention is described by a curved magnet cylinder. The non-annular magnet cylinder 20 has a top surface 202, a bottom surface 204, a first side surface 206, a second side surface 208, a first end 210 and a second end 212. The top surface 202 is opposite to the bottom surface 204, and the first end 210 Opposite the second end 212, the first side 206 of the non-annular magnet cylinder 20 is disposed opposite to the second side 208 and has a different polarity. A closed magnetic field line is generated between the first side 206 and the second side 208. In other words, when the first side 206 of the non-annular magnet cylinder 20 is set to the N pole and the second side 208 of the non-annular magnet cylinder 20 is set to the S pole, the magnetic field line Φ of the non-annular magnet cylinder 20 will It is emitted from the first side 206 and enters the second side 208 of the non-annular magnet cylinder 20 to form a closed magnetic field line.

Refer to Figure 2A for details. The magnetic conductive member 22 of the embodiment of the present invention can be manufactured by an iron sheet or a silicon steel sheet by a stamping process, or can be integrally sintered by a powder metallurgy process using a magnetic powder, and the outer shape thereof is a U-shaped frame body. However, the foregoing materials are not limited by the magnetic conductive member 22 of the embodiment of the present invention, and any material having magnetic permeability and capable of being conducted as magnetic lines of force can be used to practice the present invention.

The magnetic conductive member 22 has a top plate 222, a bottom plate 224 and a side plate 226, wherein the side plate 226 is connected between the top plate 222 and the bottom plate 224. As shown in FIG. 2A, the top plate 222 of the magnetic conductive member 22 covers a partial area of the top surface 202 of the non-annular magnet cylinder 20, and the bottom plate 224 of the magnetic conductive member 22 covers a partial area of the bottom surface 204 of the non-annular magnet cylinder 20. The side plates 226 of the magnetic member 22 cover a partial area of the first side 206 of the non-annular magnet cylinder 20. Furthermore, the magnetic conductive member 22 is used to cover a partial area of the top surface 202, the bottom surface 204 and the first side surface 206 of the non-annular magnet cylinder 20.

Referring to Figure 2A, reference is made to Figure 2B. Figure 2B shows a schematic cross-sectional view of Figure 2A. When the first side 206 of the non-annular magnet cylinder 20 is set to the N pole and the second side 208 of the non-annular magnet cylinder 20 is set to the S pole, the magnetic field line Φ of the non-annular magnet cylinder 20 will be from the first side. 206 is emitted and passed through the magnetic deflector 22 to enter the second side 208 of the non-annular magnet cylinder 20 to form a closed magnetic field line. In addition, as shown in FIG. 2C, when the first side 206 of the non-annular magnet cylinder 20 is set to the S pole and the second side 208 of the non-annular magnet cylinder 20 is set to the N pole, the non-annular magnet cylinder 20 The magnetic field lines Φ will be emitted by the second side 208 and then passed through the magnetic deflector 22 to enter the first side 206 of the non-annular magnet cylinder 20 to form a closed magnetic field line.

Reference is made to Figures 2B and 2C. The magnetic conductive member 22 of the magnetic guiding device 2 not only provides a path through which the magnetic force lines Φ flow, but also more concentrates the distribution of the magnetic lines of force Φ emitted by the non-annular magnet column 20 without causing loss of the magnetic lines of force Φ. Thus, the magnetic field lines Φ generated by the magnetic conductive device 2 of the embodiment of the present invention can collectively and effectively cut the coil 352 in the voice coil motor and interact with the electromagnetic field generated after the coil 352 is energized, thereby generating the voice coil motor. The amount of motivation.

Refer to Figure 3. FIG. 3 is a schematic view showing the appearance of a magnetic guiding device according to another embodiment of the present invention. The magnetic guiding device 2a includes a non-annular magnet cylinder 20a and a magnetic conductive member 22a, which are an assembly of a non-annular magnet cylinder 20a and a magnetically permeable member 22a. The magnetic conductive member 22a covers the non-annular magnet cylinder 20a as a path through which the magnetic lines of force generated by the non-annular magnet cylinder 20a flow, and allows the magnetic lines of force to be concentrated. Compared with the magnetic guiding device 2 of FIG. 2A, the magnetic conductive member 22a of the magnetic guiding device 2a completely covers the top surface of the non-annular magnet cylinder 20a, and the bottom plate completely covers the bottom surface of the non-annular magnet cylinder 20a, and the side plate 226 is completely Covering one side of the non-annular magnet cylinder 20a. Furthermore, the magnetically permeable member 22a is used to cover the entire area of the top surface, the bottom surface and the side surface of the non-annular magnet cylinder 20a.

Refer to Figure 4. FIG. 4 is a schematic view showing the appearance of a magnetic guiding device according to still another embodiment of the present invention. The magnetic guiding device 2b includes a non-annular magnet cylinder 20b and a magnetic conductive member 22b, which are assembled by a combination of the non-annular magnet cylinder 20b and the magnetic conductive member 22b. The magnetic conductive member 22b covers the non-annular magnet cylinder 20b as a path through which magnetic lines of force generated by the non-annular magnet cylinder 20b flow, and allows the magnetic lines of force to be concentrated. Compared with the magnetic guiding device 2 in FIG. 2A, the non-annular magnet cylinder 20b of the magnetic guiding device 2b is a rectangular magnet cylinder.

Referring to Figure 2A, reference is made to Figure 5. FIG. 5 is an exploded perspective view of a voice coil motor according to an embodiment of the present invention. The voice coil motor 3 includes a fixed base 30, a movable assembly 35, and at least two magnetic guiding devices 2 as shown in FIG. 2A. The fixed base 30 is a square frame having four side walls 306 and a bottom plate 308. The four side walls 306 and the bottom plate 308 define a receiving cavity 304 for receiving the movable component 35. At the same time, a central through hole 305 is provided at the center of the bottom plate 308, and the central through hole 305 serves as a path for the movable assembly 35 to move.

The fixed base 30 has four corners, and each of the corners or any two opposite corners is provided with a magnetic portion 302. In this embodiment, the structure in which the magnetic portions 302 are disposed at four corners is taken as an illustration. The magnetic portion 302 is for accommodating the magnetic guiding device 2 corresponding thereto, and the magnetic guiding device 2 is positioned in the magnetic portion 302. The shape of the magnetic portion 302 corresponds to the magnetic guiding device 2. Further, the magnetic portion 302 can be an arc-shaped receiving groove structure for accommodating the magnetic guiding device 2 of the curved cylinder.

Further, the magnetic portion 302 is disposed at a corner between two adjacent sidewalls 306 of the fixed base 30. The magnetic portion 302 includes two positioning recesses 3020 and a positioning slot 3022, wherein the two positioning recesses 3020 are respectively opened. The two adjacent ends 306 are used to clamp the two ends 210, 212 of the magnetic guiding device 2, and the positioning groove 3022 is used to fix the bottom plate 224 of the magnetic conductive member 22 on the magnetic guiding device 2. As such, the magnetically permeable device 2 can be quickly assembled and positioned in the magnetically permeable portion 302 without being affected by external environmental changes.

Refer to Figure 5 for details. The movable assembly 35 includes a lens carrier 350 and a coil 352, wherein the coil 352 is disposed on the lens carrier 350. Further, the lens carrier 350 is a circular body having a central hole 3502, wherein the central hole 3502 of the lens carrier 350 is used to accommodate a lens (not shown in FIG. 5). The lens can be locked in the central hole 3502, and the locking mode is not limited by the present invention, and can be used to implement the present invention by screwing, sticking, and the like. In addition, the coil 352 is sleeved on the periphery of the lens carrier 350 and fixed in the coil slot 3504 of the periphery of the lens carrier 350, and combined with the lens carrier 350 to form a linkage body.

Refer to Figure 5 for details. The voice coil motor 3 further includes a lower elastic piece 33 which is disposed at the bottom of the fixed base 30. The lower elastic piece 33 is a single ring closed structure having two support members 332 and a deforming member 330. The two supporting members 332 and the deforming member 330 can be integrally formed. The two supporting members 332 are fixedly connected to two corresponding corners of the bottom of the fixed base 30, and the deforming member 330 is used for contacting and connecting the movable assembly 35. bottom. In other words, the support member 332 of the lower elastic piece 33 is positioned at the bottom of the fixed base 30, and the deforming member 330 of the lower elastic piece 33 is in close contact with the bottom of the movable assembly 35, wherein the deforming member 330 includes the crotch portion 3302 and the brake. Part 3304. When the movable component 35 moves, the movable component 35 can deform the deforming member 330. At this time, the crotch portion 3302 of the deforming member 330 is flexibly deformed as the movable component 35 moves and positions, and the elastic force is applied via the braking portion 3304. The restoring force is applied to the active component 35.

Refer to Figure 5 for details. The voice coil motor 3 further includes an upper elastic piece 34 which is disposed at the top of the fixed base 30. The upper elastic piece 34 is a single ring closed structure having two support members 342 and a deforming member 340. The two supporting members 342 and the deforming member 340 can be integrally formed. Two supporting members 342 are fixedly connected to two corresponding corners of the top of the fixed base 30, and the deforming member 340 is used for contacting and connecting the movable assembly 35. top. In other words, the support member 342 of the upper elastic piece 34 is positioned at the top of the fixed base 30, and the deformation member 340 of the upper elastic piece 34 is in close contact with the top of the movable assembly 35, wherein the deformation member 340 includes the crotch portion 3402 and the brake. Part 3404. When the movable component 35 moves, the movable component 35 can drive the deformation member 340 to deform. At this time, the crotch portion 3402 of the deforming member 340 is flexibly deformed as the movable component 35 moves and positions, and the elastic force is applied via the braking portion 3404. The restoring force is applied to the active component 35.

Refer to Figure 5 for details. The electromagnetic field generated by the coil 352 on the movable assembly 35 interacts with the magnetic lines of force generated by the four magnetic guiding devices 2, and the movable assembly 35 is pushed by the electromagnetic thrust to perform axial movement (up/down movement). At this time, the upper elastic piece 34 and the lower elastic piece 33 are flexibly deformed as the movable component 35 moves or is positioned, and an elastic restoring force is applied to the movable component 35. In other words, when the movable assembly 35 is forced upward and moved upward, the upper elastic piece 34 is pushed by the top of the movable assembly 35 to be deformed, and a downward elastic recovery force is applied to the movable assembly 35. In addition, when the movable assembly 35 is forced to move downward, the lower elastic piece 33 is pushed by the bottom of the movable assembly 35 to be deformed, and an upward elastic restoring force is applied to the movable assembly 35.

Refer to Figure 5 for details. The voice coil motor 3 further includes a cover body 32. The cover body 32 is a rectangular frame having four side walls 322 and a top plate 324. A central through hole 326 is defined in the center of the top plate 324 for moving as the movable component 35. path of. The cover body 32 is used to cover the fixed base 30 and to accommodate the movable assembly 35, the fixed base 30, the at least two magnetic guiding devices 2, the lower elastic piece 33 and the upper elastic piece 34 therebetween. In addition, the cover 32 can be a conductive cover made of a metal conductive material, and any one of the side walls 322 is commonly grounded with the circuit of the voice coil motor 3 (not shown in FIG. 5) to achieve electromagnetic shielding. (EMI) effect.

Refer to Figure 5 for details. In the method of assembling the voice coil motor 3, the lower elastic piece 33 is first assembled to the bottom of the fixed base 30, and then the magnetic conductive members 2 are respectively disposed in the magnetically placed portion 302 of the fixed base 30. Next, the movable component 35 is mounted in the accommodating cavity 304 of the fixed base 30, and the upper elastic piece 34 is fixed on the top of the fixed base 30 and is in contact with the movable component 35. Thus, the assembled voice coil motor 3 can be constructed as shown in FIG. 6. FIG. 6 is a schematic structural view of a portion of the voice coil motor according to the embodiment of the present invention. Finally, the cover 32 is covered on the fixed base 30 and combined with the fixed base 30 to form the outer casing of the voice coil motor 3, wherein the cover 32 and the fixed base 30 are the movable assembly 35, the fixed base 30, and at least two magnetic guiding devices. 2. The components of the voice coil motor 3 such as the lower elastic piece 33 and the upper elastic piece 34 are accommodated therebetween.

However, the assembly sequence of the voice coil motor 3 described above is not a limitation of the present invention, and the present invention can be implemented by providing the aforementioned components completely and correctly between the fixed base 30 and the cover 32. For example, the voice coil motor 3 may firstly mount the movable component 35 in the accommodating cavity 304 of the fixed base 30, and then place the magnetic conductive components 2 in the magnetic poles 302 of the fixed base 30, respectively.

Refer to Figures 4, 6, and 7. FIG. 7 is a schematic structural view of a portion of a voice coil motor according to another embodiment of the present invention. Compared with the voice coil motor 3 disclosed in FIG. 6 , in the voice coil motor 4 disclosed in FIG. 7 , the four side walls 406 or any two opposite side walls 406 of the fixed base 40 are provided with a magnetic portion 402 , and the magnetic portion 402 is disposed. It is used to accommodate the magnetic conductive arrangement 2b as disclosed in FIG. In other words, the fixed base 40 of the voice coil motor 4 is a rectangular frame, and the magnetic portion 402 on the fixed base 40 is used to accommodate the magnetic guiding device 2b corresponding thereto, and the magnetic guiding device 2b is positioned therein. . The shape of the magnetic portion 402 corresponds to the magnetic guiding device 2b. Further, the magnetic portion 402 can be a rectangular receiving groove structure for accommodating the magnetic guiding device 2b of the rectangular cylinder. As such, the magnetic guiding device 2b can be quickly assembled and positioned in the magnetic portion 402 without being affected by external environmental changes.

In summary, the magnetic guiding device of the embodiment of the present invention is composed of a magnet and a magnetic conductive member, and is disposed in the voice coil motor. Further, the magnetic guiding device of the embodiment of the present invention can reduce the occurrence of invalid magnetic lines of force by the structure of the magnet and the magnetic conductive member, and generate a dense magnetic wave line with a short distance and a magnetic field acting on the coil under the energization. In turn, the stability of the voice coil motor is enhanced, the electromagnetic thrust of the voice coil motor is enhanced, the size of the voice coil motor is reduced, and the overall performance of the voice coil motor is improved. At the same time, the magnetic guiding device of the embodiment of the present invention is disposed in the magnetic portion of the fixed base, which is not separated from the fixed base due to factors such as increased use time or external force, thereby effectively improving the overall voice coil motor. Stability, magnetic properties and performance.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

Convention:

1. . . Voice coil motor

10. . . Fixed component

12. . . Active component

120. . . Lens carrier

122. . . Coil

102. . . Magnetic frame

104. . . magnet

Φ. . . Magnetic line of force

PX. . . The central axis

13. . . Fixed base

this invention:

2, 2a, 2b. . . Magnetic guide

20, 20a, 20b. . . Non-annular magnet column

202. . . Top surface

204. . . Bottom

206. . . First side

208. . . Second side

210. . . First end

212. . . Second end

22, 22a, 22b. . . Magnetic guide

222. . . roof

224. . . Bottom plate

226. . . Side panel

Φ. . . Magnetic line of force

352. . . Coil

3. . . Voice coil motor

30. . . Fixed base

35. . . Active component

306. . . Side wall

308. . . Bottom plate

304. . . Cavity chamber

305. . . Central through hole

302. . . Magnetic part

3020. . . Positioning notch

3022. . . Positioning slot

350. . . Lens carrier

352. . . Coil

3502. . . Central hole

3504. . . Coil slot

33. . . Lower shrapnel

332. . . supporting item

330. . . Deformed piece

3302. . . Crotch

3304. . . Brake

34. . . Upper shrapnel

342. . . supporting item

340. . . Deformed piece

3402. . . Crotch

3404. . . Brake

32. . . Cover

322. . . Side wall

324. . . roof

326. . . Central through hole

4. . . Voice coil motor

40. . . Fixed base

406. . . Side wall

402. . . Magnetic part

1 is a schematic structural view of a conventional voice coil motor;

2A is a schematic view showing the appearance of a magnetic guiding device according to an embodiment of the present invention;

2B is a schematic cross-sectional view of FIG. 2A;

2C is another schematic cross-sectional view showing a magnetic guiding device according to an embodiment of the present invention;

3 is a schematic view showing the appearance of a magnetic guiding device according to another embodiment of the present invention;

4 is a schematic view showing the appearance of a magnetic guiding device according to still another embodiment of the present invention;

FIG. 5 is an exploded perspective view of a voice coil motor according to an embodiment of the present invention; FIG.

6 is a schematic structural view of a portion of a voice coil motor according to an embodiment of the present invention; and

FIG. 7 is a schematic structural view of a portion of a voice coil motor according to another embodiment of the present invention.

2. . . Magnetic guide

20. . . Non-annular magnet column

202. . . Top surface

204. . . Bottom

206. . . First side

208. . . Second side

210. . . First end

212. . . Second end

twenty two. . . Magnetic guide

222. . . roof

224. . . Bottom plate

226. . . Side panel

Claims (14)

A magnetic device for a voice coil motor, comprising: a non-annular magnet cylinder having a top surface, a bottom surface, a first side surface and a second side surface, wherein the top surface is opposite to the bottom surface, the first side surface Opposite the second side and having a different polarity; and a magnetic conductive member having a top plate, a bottom plate and a side plate, the side plate connecting the top plate and the bottom plate, wherein the top plate covers the top surface, the bottom plate covers The bottom surface covers the first side. The magnetic permeability device of claim 1, wherein the magnet is a curved magnet cylinder or a rectangular magnet cylinder. The magnetic permeability device of claim 1, wherein the top plate covers a partial area of the top surface, the bottom plate covers a partial area of the bottom surface, and the side plate covers a partial area of the first side surface. The magnetic conductive device of claim 1, wherein the top plate covers the entire area of the top surface, the bottom plate covers the entire area of the bottom surface, and the side plate covers the entire area of the first side surface. The magnetic permeability device of claim 1, wherein the magnetic conductive member is a U-shaped frame. A voice coil motor includes: a movable component; a fixed base having a receiving cavity and at least two magnetic parts, wherein the receiving cavity is for receiving the movable component; at least two magnetic guiding devices are correspondingly disposed on In the magnetic portion, the magnetic guiding device comprises: a non-annular magnet cylinder having a top surface, a bottom surface, a first side surface, a second side surface and two ends, wherein the top surface is opposite to the bottom surface Providing that the two ends are oppositely disposed, the first side is opposite to the second side and has a different polarity; and a magnetic conductive member has a top plate, a bottom plate and a side plate, and the side plate is connected between the top plate and the bottom plate The top plate covers a top surface of the magnet, the bottom plate covers a bottom surface of the magnet, and the side plate covers the first side of the magnet. The voice coil motor of claim 6, wherein the movable component comprises a lens carrier and a coil, and the coil is disposed at a periphery of the lens carrier. The voice coil motor of claim 7, wherein the fixed base is a rectangular frame having four side walls and a bottom plate having a through hole in the center, the four side walls and the bottom plate enclosing the receiving Cavity. The voice coil motor of claim 8, wherein the fixed base has four corners, and the magnetic portions are disposed at any two opposite corners, or the magnetic portions are disposed at each corner. The voice coil motor of claim 9, wherein the magnetic portion includes two positioning notches and a positioning groove, and the two positioning notches are respectively formed on two adjacent side walls for fastening The two ends of the magnetic guiding device are used to fix the bottom plate of the magnetic conductive member on the magnetic guiding device. The voice coil motor of claim 10, further comprising a top elastic piece, the upper elastic piece is a single ring closed structure having two support members and a deforming member, the two support members are connected to the top of the fixed base The deforming member is in contact with the top of the movable component. The voice coil motor of claim 11, further comprising a lower elastic piece, wherein the lower elastic piece is a single ring closed structure, and has two supporting members and a deforming member, and the two supporting members are connected to the bottom of the fixed base. The deforming member is in contact with the bottom of the movable assembly. The voice coil motor of claim 12, further comprising a cover body, wherein the cover body is a rectangular frame having four side walls and a top plate having a through hole at the center, the cover body for covering the Fixing the base and housing the movable component, the fixed base and the at least two magnetic guiding devices. The voice coil motor of claim 13, wherein the cover is a conductive cover, and any one of the side walls is grounded.