TWI427902B - Voice coil motor - Google Patents

Description

Voice coil motor assembly

The invention relates to a voice coil motor assembly.

The Voice Coil Motor (VCM) is suitable as a short-range drive in electronic products such as digital cameras, mobile phones, digital video cameras, etc. (See Design of a voice coil motor used in the focusing system of a digital video camera, Magnetics, IEEE Transactions on Volume 41, Issue 10, Oct. 2005 Page(s): 3979-3981).

A common voice coil motor assembly mainly includes a mounting bracket and a cartridge movably mounted in the mounting bracket and at least one elastic piece. The cartridge is used to mount components such as a lens barrel or a focus lens group or a zoom lens group for protecting the voice coil motor assembly. In the process of installing the lens barrel of the lens module, the barrel of the existing voice coil motor assembly needs to rotate the lens barrel relative to the barrel. However, the conventional voice coil motor assembly has low reliability, and the entire voice coil motor assembly is often ineffective during assembly due to excessive torque caused by excessive torque in the voice coil motor assembly.

In view of this, it is necessary to provide a voice coil motor assembly with high torsion resistance and high reliability.

A voice coil motor assembly for coordinating with a lens module. The voice coil horse The assembly includes a fixing member, a movable member movable relative to the fixing member and received in the fixing member, and at least one elastic piece. The fixing component comprises a fixing frame and a permanent magnet installed in the fixing frame. The fixing frame includes a plurality of prisms and a plurality of connecting rods connecting the plurality of prisms. The plurality of prisms and the plurality of connecting rods together form a first accommodating cavity for accommodating the movable element. The movable element includes a barrel and a coil wound around the outer wall of the barrel. The permanent magnet is disposed opposite the coil. The elastic piece is fixed on the fixing frame of the fixing component. A first guide member is disposed on each of the plurality of prisms of the fixing member at least two of the prisms adjacent to the inner side wall of the first receiving cavity. The top and bottom of the loading tube of the movable component are respectively provided with at least two second guiding members matched with the first guiding member at positions corresponding to the first guiding member. The first guiding member and the second guiding member are mutually engaged in the axial direction of the movable member, and are relatively slidable along the axial direction of the movable member.

Compared with the prior art, the movable element and the fixed element of the voice coil motor assembly of the present invention are mutually engaged in the axial direction of the movable element and are slidable relative to each other in the axial direction of the movable element. Therefore, in the process of screwing the lens mold assembly into the movable member, since the movable member and the fixing member are mutually engaged by the cooperation of the first guide member and the second guide member, even if the rotational torque is too large, The shrapnel structure may be deformed or broken so that the voice coil motor assembly fails, and the assembly yield is improved.

100‧‧‧ voice coil motor assembly

20‧‧‧ Shell

22‧‧‧ top board

24‧‧‧First side panel

25a, 25b‧‧‧ terminal slot

26‧‧‧Second side panel

30, 70‧‧‧Fixed components

32‧‧‧ Fixing frame

34‧‧‧ permanent magnet

326‧‧‧First guide

40, 80‧‧‧ movable components

41, 81‧‧‧Packing

42‧‧‧ coil

415‧‧‧Second guide

50a‧‧‧First shrapnel

50b‧‧‧second shrapnel

501‧‧‧ gap

504a‧‧‧First positioning hole

502a‧‧‧First lead terminal

510‧‧‧ openings

60‧‧‧Carrier

65‧‧‧Isolation box

324‧‧‧First positioning column

325‧‧‧ Groove

322‧‧‧Magnetic Department

321‧‧‧First accommodation cavity

323, 723‧‧ ‧ prism

327‧‧‧ Connecting rod

412‧‧‧Second accommodating chamber

413‧‧‧Second positioning column

414‧‧‧ dispensing groove

726‧‧‧ bumps

82‧‧‧Extensions

821‧‧‧ guide port

222‧‧‧ first opening

1 is a perspective assembled view of a voice coil motor assembly according to a first embodiment of the present invention; FIG. 2 is a perspective exploded view of the voice coil motor assembly of FIG. 1; FIG. 3 is a perspective view of a fixed frame of the voice coil motor assembly of FIG. Figure 4 is a perspective view of the movable element of the voice coil motor assembly of Figure 2; Figure 5 is a perspective view of the fixing frame of the voice coil motor assembly of Figure 2; Figure 6 is a partial perspective view of the fixing component of the voice coil motor assembly of the second embodiment of the present invention; Figure 7 is the sound of Figure 6. Part of the movable element of the ring motor assembly is stereoscopic.

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

Referring to FIG. 1 and FIG. 2 together, the voice coil motor assembly 100 of the embodiment of the present invention is used for coordinating with a lens module (not shown). The voice coil motor assembly 100 includes a housing 20, a fixing member 30, a movable member 40 movable relative to the fixing member 30, a first elastic piece 50a, a second elastic piece 50b, and a carrier 60. The movable element 40 is slidably mounted within the fixed element 30. The first elastic piece 50a and the second elastic piece 50b are respectively disposed on the top surface and the bottom surface of the fixing member 30. The housing 20 and the carrier 60 together form a spacer box 65. The fixing component 30, the movable component 40, the first elastic piece 50a and the second elastic piece 50b are housed in the isolation box 65.

The housing 20 is used to eliminate interference from external electromagnetics to the voice coil motor assembly 100 and to prevent electromagnetic interference of the voice coil motor assembly 100 from affecting the operation of its external electronic components. The outer casing 20 can be made of a magnetic mask material such as a nickel-iron alloy, a conductive plastic, a surface conductive material, or a conductive glass. The outer casing 20 has a top plate 22, two first side plates 24 vertically disposed on opposite sides of the top plate 22, and two second side plates vertically disposed on opposite sides of the top plate 22 and connected to the first side plate 24. 26. The top plate 22 and the two first sides The plate 24 and the two second side plates 26 form a receiving space (not labeled) for receiving the fixing member 30. The geometric center of the top plate 22 defines a circular first opening 222 for injecting light into the lens module. One of the first side plates 24 is provided with two terminal slots 25a and 25b.

Referring to FIG. 3 to FIG. 5 together, the fixing component 30 includes a fixing frame 32 and four permanent magnets 34 mounted in the fixing frame 32. The fixing frame 32 is a frame body having a rectangular parallelepiped shape, and includes four spaced apart prisms 323 and a connecting rod 327 connecting the four prisms 323. The four prisms 323 and the plurality of connecting rods 327 of the fixing frame 32 define a first accommodating cavity 321 for receiving the movable element 40. The prism 323 and the connecting rod 327 on each side of the fixing frame 32 constitute a magnetic portion 322 for accommodating the permanent magnet 34. The opposite ends of each prism 323 of the fixing frame 32 respectively extend two first positioning posts 324 along the length direction of the prism 323. The first positioning post 324 is used to position the fixing frame 32 and the first elastic piece 50a. A groove 325 is defined in a side of any one of the four prisms 323 facing away from the first receiving cavity 321 . A first guiding member 326 is defined in a longitudinal direction of the vertical ground along the inner side wall of the first plenum 321 . In this embodiment, the first guiding member 326 is a guiding groove.

It can be understood that the first positioning post 324 can also be separately formed, and then fixed to the fixing frame 32 by other bonding methods such as gluing bonding, screwing, etc.; the four prisms 323 can also be two pairs. The first guide member 326 is defined in each of the two prisms 323 at an angular position, or a first guide member 326 is defined on any of the three prisms 323, and is not limited to the embodiment.

The movable element 40 is mounted in the first accommodating cavity 321 of the fixing component 30. The movable element 40 has a barrel 41 and a coil 42 wound around the outer wall of the barrel 41. This embodiment The first guiding member 326 corresponding to the fixing member 30 at the top and the bottom of the loading cylinder 41 is respectively provided with a second guiding member 415. In this embodiment, the second guiding member 415 is a protrusion that matches the guiding groove. The second guiding member 415 and the first guiding member 326 on the fixing frame 32 are mutually engaged in the axial direction of the movable member 40 and are relatively slidable along the axial direction of the movable member 40. The coil 42 is disposed opposite the permanent magnet 34. The cartridge 41 has a second circular receiving cavity 412. The second accommodating cavity 412 is configured to receive the lens module. The sidewall of the second accommodating cavity 412 extends in a direction parallel to the axis of the loading cylinder 41 to form a plurality of second positioning posts 413. The plurality of second positioning posts 413 are evenly distributed on the loading cylinder 41 for positioning with the first elastic piece 50a and the second elastic piece 50b. Two dispensing grooves 414 are formed in the vicinity of each of the second positioning posts 413. The dispensing grooves 414 can be injected into the glue, so that the loading cylinder 41 is glued to the first elastic piece 50a and the second elastic piece 50b. The two ends of the coil 42 are respectively connected to the first elastic piece 50a and the second elastic piece 50b adjacent thereto.

It can be understood that the second positioning post 413 can also be separately formed, and then fixed to the loading cylinder 41 by other bonding methods such as gluing bonding, screwing, and the like.

A second opening 510 is defined in the geometric center of the first elastic piece 50a and the second elastic piece 50b. A plurality of notches 501 are uniformly disposed at a position corresponding to the plurality of second positioning posts 413 on the loading cylinder 41 at a periphery of the second opening 510. The second opening 510 is for injecting light into or out of the lens module. The first elastic piece 50a has four first positioning holes 504a and a first guiding terminal 502a. The second elastic piece 50b has four evenly distributed second positioning holes 504b and a second guiding terminal 502b. The first positioning hole 504a and the second positioning hole 504b are matched with the first positioning post 324. The first conductive terminal 502a and the second conductive terminal 502b are connected to an external circuit, so that the current sequentially first the first terminal 502a, the first elastic piece 50a, one end of the coil 42, and the coil The other end of 42 and the second guide terminal 502b of the second elastic piece 50b form a closed loop. The first and second guiding terminals 502a and 502b are similar in structure, and each has an L shape, but the first guiding terminal 502a is long and the second guiding terminal 502b is short. One end of the first conductive terminal 502a is received in the recess 325, and the other end is received in the carrier 60. One end of the second conductive terminal 502b is also received in the carrier 60.

It can be understood that the first guiding terminal 502a and the first elastic piece 50 can be separately formed, and then fixed to the first elastic piece 50a by glue bonding, screwing or other fixing methods, or can be combined with the first The elastic piece 50a is integrally formed. In the embodiment, the first conductive terminal 502a is integrally formed with the first elastic piece 50a.

The first and second lead terminals 502a and 502b are connected to an external circuit to cause a current to flow in the coil 42, and the current-carrying coil 42 is subjected to a force in a magnetic field formed by the four permanent magnets 34, thereby driving the movable Element 40 moves in its axial direction.

It can be understood that the voice coil motor assembly 100 may not directly connect the first and second lead terminals 502a and 502b, but directly connect the coil 42 to an external circuit, and is not limited to the embodiment, as long as the coil 42 has The current can flow.

It can be understood that the first positioning post 324 can also be two, three or more, and is not limited to the embodiment, as long as the first positioning hole 504a and the second positioning hole 504b cooperate with the first elastic piece 50a, The second elastic piece 50b and the fixing frame 32 can be positioned and fixed; at the same time, the number of the second positioning posts 413 of the loading cylinder 41 can also be two, three or more, not limited to the embodiment, as long as The first notch 501 is adapted to position and fix the first elastic piece 50a and the second elastic piece 50b and the charging cylinder 41, and is not limited to the embodiment.

When assembling, the second guiding member 415 of the movable element 40 is first movably received in The first elastic piece 50a and the second elastic piece 50b are respectively matched with the first positioning hole 504a and the second positioning hole 504b and the first positioning post 324 by the first guiding piece 326. The second positioning post 413 of the loading cylinder 41 cooperates with the first notch 501 of the first positioning hole 504a and the second positioning hole 504b to match the first elastic piece 50a, the first elastic piece 50a The two elastic pieces 50b are positioned and fixed with the loading cylinder 41. The fixing component 30 is received in the housing 20 and fixed to the carrier 60. The first guiding terminal 502a and the second guiding terminal 502b pass through the carrier 60 and are respectively connected by the terminal slot 25a. , 25b is connected to an external circuit.

In use, the coil 42 is energized such that a Lorentz force is generated between the coil 42 and the permanent magnet 34, causing the movable element 40 to move axially up and down relative to the fixed element 30.

Please refer to FIG. 6 to FIG. 7 together, which is a voice coil motor assembly 200 according to a second embodiment of the present invention. The structure of the voice coil motor assembly 200 is substantially the same as that of the voice coil motor assembly 100 of the first embodiment, except that the four prisms 723 of the fixing member 70 respectively extend along the radial direction thereof. In the embodiment, the first guiding member is a protrusion 726; the four corner positions of the top and the bottom of the loading tube 81 of the movable member 80 respectively extend with an extending member 82, and the extending member 82 A second guiding member matched with the protrusion 726 is respectively formed. In the embodiment, the second guiding member is a guiding opening 821.

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 assembly

20‧‧‧ Shell

22‧‧‧ top board

24‧‧‧First side panel

25a, 25b‧‧‧ terminal slot

26‧‧‧Second side panel

30‧‧‧Fixed components

32‧‧‧ Fixing frame

34‧‧‧ permanent magnet

326‧‧‧First guide

40‧‧‧ movable components

41‧‧‧Packing

42‧‧‧ coil

415‧‧‧Second guide

50a‧‧‧First shrapnel

50b‧‧‧second shrapnel

501‧‧‧ gap

504a‧‧‧First positioning hole

502a‧‧‧First lead terminal

510‧‧‧ openings

60‧‧‧Carrier

502b‧‧‧Second conductive terminal

504b‧‧‧Second positioning hole

222‧‧‧ first opening

Claims (9)

A voice coil motor assembly for coordinating with a lens module, the voice coil motor assembly comprising a fixing component, a movable component movable relative to the fixing component and received in the fixing component, and at least one elastic piece. The fixing component comprises a fixing frame and a permanent magnet mounted in the fixing frame, the fixing frame comprises a plurality of prisms and a plurality of connecting rods connecting the plurality of prisms, the plurality of prisms and the plurality of connecting rods are enclosed together a first accommodating cavity for accommodating the movable component, the movable component comprising a loading cylinder and a coil wound around an outer wall of the charging cylinder, the permanent magnet is disposed opposite to the coil, and the elastic piece is fixed on the The fixing frame is improved in that: at least two of the plurality of prisms of the fixing element are respectively disposed on the inner side wall of the first accommodating cavity, and a first guiding member is disposed on the inner side wall of the first accommodating cavity, and the movable component is loaded The first guiding member is respectively provided with at least two second guiding members matched with the first guiding member, and the first guiding member and the second guiding member are along the movable member. Clamping each other in the axial direction, and may be movable axially along the relative sliding movement of the element. The voice coil motor assembly of claim 1, wherein the first guiding member is a guiding groove, and the second guiding member is a protrusion matching the guiding groove. The voice coil motor assembly of claim 1, wherein the first guiding member is a protrusion extending from a radial direction of the fixing member, and the loading tube on the movable member At least four extension members are respectively extended from the four corners of the top and the bottom, and the second guiding member is provided with a guiding port matched by the protrusions respectively on the extending member. The voice coil motor assembly of claim 1, wherein the at least one elastic piece comprises a first elastic piece and a second elastic piece, and the four corner positions of the upper end surface and the lower end surface of the fixing frame respectively extend to form a first Positioning post, the first elastic piece has four uniformly distributed first positioning holes, and the second elastic piece has four evenly distributed second positioning holes, the first positioning hole and the second positioning hole The positional hole is matched with the first positioning post, and the first elastic piece and the second elastic piece are fixed on the fixing frame by the first positioning post and the first positioning hole and the second positioning hole. The voice coil motor assembly of claim 4, wherein the voice coil motor assembly further comprises a housing and a carrier, the housing and the carrier together forming a spacer, the fixing component The movable element and the first and second elastic pieces are all housed in the isolation box. The voice coil motor assembly of claim 5, wherein the outer casing comprises a top plate, two first side plates vertically disposed on opposite sides of the top plate, and two other opposite sides vertically disposed on the top plate. a second side plate, the top plate, the two first side plates and the two second side plates form an accommodating space for accommodating the fixing component, and the first side plate of the outer casing is provided with two terminal slots. The first elastic piece further includes a first guiding terminal, the second elastic piece further includes a second guiding terminal, the first guiding terminal and the second guiding terminal pass through the carrier and are respectively respectively The terminals are connected to the slot and connected to an external circuit. The voice coil motor assembly of claim 5, wherein any one of the plurality of prisms has a recess facing away from a side of the first receiving cavity, and one end of the first guiding terminal Placed in the groove. The voice coil motor assembly of claim 6, wherein the outer casing is made of a magnetic mask material. The voice coil motor assembly of claim 1, wherein the prism and the connecting rod on each side of the fixing frame form a magnetic portion for accommodating the permanent magnet.