TWI408871B - Voice coil motor - Google Patents

Abstract

The present invention relates to a voice coil motor. The motor includes a fixing module, an active module, and a spring plate. The fixing module includes a fixing shelf and at least a magnet thereon. The fixing shelf has flange thereon. The active module includes a box and a coil set on the box. The box has post thereon and the post has a groove. The spring plate has at least a through hole and locating hole thereon. The spring plate is fixed on the post through the through hole. Gluewater is filled into the groove and the spring plate is fixed on the post hard after the gluewater is solidified.

Description

Voice coil motor

The present invention relates to a voice coil motor, and more particularly to a voice coil motor in which a spring piece is closely coupled with a fixed frame and a barrel.

The 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 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 mainly includes a fixing frame and a loading tube and at least one elastic piece movably mounted in the fixing frame. The cartridge is used to mount a lens barrel or a focusing lens group or a zoom lens group, and the elastic piece is used to protect the voice coil motor. In the case of power-on, the voice coil motor drives the cartridge to change the distance between the lens barrel or the focus lens group or the zoom lens group and the image sensor, thereby achieving the function of focusing or zooming.

The elastic piece is provided with a positioning hole and a positioning recess, and the fixing frame and the loading cylinder respectively have a protruding column matched with the positioning hole and the positioning notch, and the elastic piece passes through the positioning hole, the positioning notch and the protruding column cooperate with the fixing frame and the loading The barrels are connected. However, such a connection The connection between the elastic piece and the fixing frame and the charging tube is not reliable, and the elastic piece is easily detached from the fixing frame or the loading tube.

In view of this, it is necessary to provide a voice coil motor in which the elastic piece is tightly coupled to the holder and the barrel.

A voice coil motor comprising: a fixing assembly comprising a fixing frame and at least one magnet, the fixing frame having a magnetic portion for accommodating the at least one magnet, the two ends of the fixing frame respectively having a first protruding post; The movable assembly includes a loading tube and a coil wound around the loading tube, the loading tube is disposed in the fixing frame, and the two ends of the loading tube are respectively provided with a boss having a groove thereon; Two elastic pieces, each of which is provided with a through hole at the center thereof, and at least two positioning holes are disposed at the edge, and the elastic piece is connected to the fixing frame through the matching hole and the first protruding post, the positioning hole A region between the through hole and the through hole is provided with at least two grooves, and a movable elastic portion is formed between the groove, and a through hole is disposed between the movable elastic portion and the through hole, and the elastic piece passes through the through hole And the boss is fixed to both ends of the barrel.

Compared with the prior art, the elastic piece of the embodiment of the present invention cooperates with the boss having the groove through the through hole, and applies glue in the groove. After the glue is solidified, the elastic piece and the charging tube can be tightly combined; The studs on the fixing frame cooperate with the positioning holes, and the elastic pieces can be tightly combined with the fixing frame.

10‧‧‧ voice coil motor

20‧‧‧shell

30‧‧‧Fixed components

40‧‧‧Activities

50‧‧‧Shrap

60‧‧‧Carrier

21‧‧‧Base

22, 321‧‧‧ side wall

210, 510‧‧‧through holes

32‧‧‧ Fixing frame

31‧‧‧ magnet

41‧‧‧Packing

42‧‧‧ coil

51‧‧‧ tablet

51a‧‧‧ first side

51b‧‧‧Second side

51c‧‧‧ third side

51d‧‧‧ fourth side

58‧‧‧First positioning hole

52‧‧‧First groove

53‧‧‧Second trench

54‧‧‧ third trench

55‧‧‧fourth trench

52a‧‧‧First start paragraph

52b‧‧‧first end

52c‧‧‧First connection segment

53a‧‧‧second starting paragraph

53b‧‧‧second end

53c‧‧‧second connection

57a‧‧‧First movable elastic department

54a‧‧‧ third starting paragraph

54b‧‧‧ third end

54c‧‧‧ third connection

57b‧‧‧Second movable elastic department

55a‧‧‧Fourth starting paragraph

55b‧‧‧fourth end

55c‧‧‧fourth connection

57c‧‧‧ Third Movable Elastic Department

57d‧‧‧4th movable elastic department

56‧‧‧Connecting Department

561‧‧ holes

322‧‧‧First accommodation cavity

323‧‧‧Magnetic Department

325‧‧‧Chamfering

324‧‧‧second groove

327‧‧‧first stud

328‧‧‧first groove

411‧‧‧Second accommodating chamber

412‧‧‧Boss

413‧‧‧second stud

414‧‧‧ third groove

1 is a perspective view of a voice coil motor in accordance with an embodiment of the present invention.

2 is an exploded view of a voice coil motor according to an embodiment of the present invention, which includes a fixing frame and a mounting Tube and shrapnel.

Figure 3 is a schematic view of the shrapnel of Figure 2.

Figure 4 is a schematic view of the mounting bracket of Figure 2.

Figure 5 is a schematic view of the cartridge of Figure 2.

Referring to FIG. 1 and FIG. 2, the voice coil motor 10 provided in the embodiment of the present invention is used to drive a lens or a lens module to move.

The voice coil motor 10 includes a housing 20, a fixing assembly 30, a movable assembly 40, two elastic pieces 50 of the same structure, and a carrier 60.

The housing 20 serves to eliminate interference from external electromagnetics to the voice coil motor 10 and to prevent the electromagnetics of the voice coil motor 10 from affecting the operation of its external electronic components.

The housing 20 has a base 21 and side walls 22 of four vertical bases 21. The base 21 and the four side walls 22 form a receiving space for receiving the fixing assembly 30. The geometric center of the base 21 defines a through hole 210 for light to enter the lens or the lens module. The housing 20 cooperates with the carrier 60 to receive the fixing assembly 30, the movable assembly 40 and the elastic piece 50 in the accommodating space.

The fixing assembly 30 includes a fixing frame 32 and four magnets 31 mounted in the fixing frame 32. The fixing frame 32 is a frame body having a square tube shape.

The movable assembly 40 is mounted in the fixed assembly 30 and includes a loading cylinder 41 and a coil 42 wound around the outer wall of the loading cylinder 41.

As shown in FIG. 3, the elastic piece 50 includes a flat plate 51, and the shape of the flat plate 51 can be a circle. Shape, square, pentagon or octagon.

Taking the flat plate 51 as a square, the flat plate 51 has a first side 51a, a second side 51b, a third side 51c, and a fourth side 51d which are sequentially connected. The first side 51a is parallel to the third side 51c, and the second side 51b is parallel to the fourth side 51d. The geometric center of the flat plate 51 defines a through hole 510 having a size corresponding to the size of the through hole 210 so that light can pass therethrough.

A first positioning hole 58 is defined in each of the four corners of the flat plate 51. In this embodiment, the first positioning hole 58 is a through hole. In a region between the first positioning hole 58 and the through hole 510, a first groove 52, a second groove 53, a third groove 54, and a fourth groove 55 are disposed around the through hole 510.

Alternatively, the first positioning hole 58 may be a convex structure; the first positioning hole 58 may not be disposed on the flat plate 51. When the flat plate 51 is circular, the three first positioning holes 58 may be equally spaced, and the angle between the adjacent first positioning holes 58 is 120 degrees.

The first groove 52 has a first starting section 52a parallel to the first side 51a, a first ending section 52b parallel to the third side 51c and opposite to the first starting section 52a, and a first starting section 52a and A first connecting section 52c between the end sections 52b and parallel to the second side 51b. The length of the first end segment 52b is less than or equal to the length of the first start segment 52a. In this embodiment, the length of the first end segment 52b is smaller than the length of the first start segment 52a.

The second groove 53 has a second starting section 53a parallel to the second side 51b, a second ending section 53b parallel to the fourth side 51d and opposite to the second starting section 53a, and a second starting section 53a and the second end section 53b and with the third side 51c Parallel second connecting section 53c. The length of the second end segment 53b is less than or equal to the length of the second start segment 53a. The second starting segment 53a and the second connecting segment 53c are located on the outer side of the first trench 52 to form a substantially "L" shape with the first connecting segment 52c and the first ending segment 52b of the first trench 52. The first movable elastic portion 57a. The first movable elastic portion 57a is transitioned from a circular arc segment to a portion between the first end portion 52b and the second connecting portion 53c by a portion between the first connecting portion 52c and the second starting portion 53a, that is, the first movable elastic force The portion 57a has a circular arc structure at the turn.

The third groove 54 has a third starting section 54a parallel to the third side 51c, a third ending section 54b parallel to the first side 51a and opposite to the third starting section 54a, and a third starting point A third connecting section 54c between the segment 54a and the third ending segment 54b and parallel to the fourth side 51d. The length of the third end segment 54b is less than or equal to the length of the third start segment 54a. The third starting segment 54a and the third connecting segment 54c are located on the outer side of the second trench 53 so as to form a substantially "L" shape with the second connecting segment 53c and the second ending segment 53b of the second trench 53. The second movable elastic portion 57b.

The fourth groove 55 has a fourth starting section 55a parallel to the fourth side 51d, a fourth ending section 55b parallel to the second side 51b and opposite to the fourth starting section 55a, and a fourth starting point A fourth connecting section 55c between the segment 55a and the fourth ending segment 55b and parallel to the first side 51a. The length of the fourth ending segment 55b is less than or equal to the length of the fourth starting segment 55a. The fourth starting segment 55a and the fourth connecting segment 55c are located on the outer side of the third trench 54 so as to form a substantially "L" shape with the third connecting segment 54c and the third ending segment 54b of the third trench 54. Third The elastic portion 57c. The fourth connecting portion 55c and the fourth ending portion 55b are located inside the first groove 52, so as to form a substantially "L shape" between the first starting portion 52a and the first connecting portion 52c of the first groove 52. Four movable elastic portions 57d.

When the first movable elastic portion 57a, the second movable elastic portion 57b, the third movable elastic portion 57c, and the fourth movable elastic portion 57d are subjected to an external force, they are flexibly deformed, and when the external force is lost, the original movable state can be restored.

The through hole 510 is respectively connected to the first ending section 52b and the first connecting section 52c, the second ending section 53b and the second connecting section 53c, the third ending section 54b and the third connecting section 54c, the fourth ending section 55b and the fourth connection. A connecting portion 56 is formed between the segments 55c. The flat plate 51 has four connecting portions 56. Each of the connecting portions 56 is provided with a through hole 561. In this embodiment, the second positioning hole 561 is a through hole.

It can be understood that the shapes of the first groove 52, the second groove 53, the third groove 54, and the fourth groove 55 are not limited to the shape of the embodiment, and may be other shapes such as a circular arc shape.

The number of grooves on the flat plate 51 is not necessarily four, but may be two, three or the like.

Referring to FIG. 4 together, the fixing frame 32 is a square structure composed of four side walls 321 , and the four side walls 321 define a first accommodating cavity 322 for accommodating the movable component 40 .

Each of the side walls 321 is provided with a magnetic portion 323 for placing the magnet 31. The shape of the magnetic portion 323 matches the shape of the magnet 31. In this embodiment, the magnetic portion 323 is rectangular. The four inner surfaces of the magnetic portion 323 are respectively disposed on the inner surface The corner 325 is such that the magnetic portion 323 has a flared shape, that is, the opening toward the outside of the side wall 321 is larger than the opening of the inner portion. Since the chamfer 325 is present, the magnet 31 can be conveniently placed in the magnetic portion 323. Further, glue can be applied between the magnet 31 and the chamfer 325 to securely fix the magnet 31 in the magnetic portion 323. .

A second groove 324 may be further disposed on the chamfer 325, and the glue may be coated in the second groove 324 to firmly fix the magnet 31 in the magnetic portion 323.

A joint of adjacent sidewalls 321 protrudes from the top and bottom of the holder 32 in a direction parallel to the central axis of the holder 32, and a part of the structure of the first protrusion 327 is cut off to form a first protrusion 327. The first groove 328. The first protrusions 327 are distributed in the same manner as the first positioning holes 58 of the elastic piece 50. The first protrusions 327 can extend into the first positioning holes 58 in the first groove 328 and the first positioning holes 58. The application of the glue allows the elastic piece 50 to be tightly coupled to the holder 32.

As shown in FIG. 5, the loading cylinder 41 is a square structure having a substantially circular second accommodating cavity 411 for receiving a lens or a lens module.

The side wall of the second accommodating cavity 411 is formed in a direction parallel to the central axis of the loading cylinder 41 to form a boss 412 having the same distribution as the second positioning hole 561 of the elastic piece 50. The boss 412 is provided with a second protruding post 413. A third groove 414 is disposed on the boss 412 and the second protrusion 413. The second protrusion 413 passes through the through hole 561, so that the connecting portion 56 is mounted on the boss 412, and then the glue is applied to the third groove 414. After the glue is solidified, the elastic piece 50 and the loading tube 41 can be fixed together. Since the area of the boss 412 is large, the contact area of the connecting portion 56 of the elastic piece 50 and the boss 412 is large, thereby making The combination of the shrapnel 50 and the loading cylinder 41 is more secure.

It can be understood that one of the boss 412 and the second boss 413 may be disposed on the loading cylinder 41.

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.

10‧‧‧ voice coil motor

20‧‧‧shell

30‧‧‧Fixed components

40‧‧‧Active components

50‧‧‧Shrap

60‧‧‧Carrier

21‧‧‧Base

22‧‧‧ side wall

210, 510‧‧‧through holes

32‧‧‧ Fixing frame

31‧‧‧ magnet

41‧‧‧Packing

42‧‧‧ coil

Claims (8)

A voice coil motor comprising: a fixing assembly comprising a fixing frame and at least one magnet, the fixing frame having a magnetic portion for accommodating the at least one magnet, the two ends of the fixing frame respectively having a first protruding post; The movable assembly includes a loading tube and a coil wound around the loading tube, the loading tube is disposed in the fixing frame, and the two ends of the loading tube are respectively provided with a boss having a groove thereon; The two elastic pieces are respectively provided with a through hole at the center of the elastic piece, and at least two positioning holes are disposed at the edge, and the elastic piece is connected to the fixing frame through the cooperation of the positioning hole and the first protruding post, the positioning hole is The region between the through holes is provided with at least two grooves around the through hole, and a movable elastic portion is formed between the through holes, and a through hole is disposed between the movable elastic portion and the through hole, and the elastic piece passes through the through hole The boss is matched and fixed to both ends of the barrel, and the groove is used for accommodating the medium so that the elastic piece is tightly coupled with the boss. The voice coil motor of claim 1, wherein: the inner surface of the magnetic portion has a chamfer. The voice coil motor of claim 2, wherein the chamfer is provided with a groove for filling the medium such that the magnet is tightly coupled to the holder. The voice coil motor of claim 1, wherein: the boss is provided with a second protrusion, and the groove on the boss comprises a second protrusion. section. The voice coil motor of claim 1, wherein: the elastic piece is provided with four grooves, the elastic piece comprises a square flat plate, and the flat plate has four first sides and a second side connected in series. The first groove includes a first starting segment parallel to the first side, a first ending segment parallel to the third side and opposite the first starting segment, and a first edge a first connecting segment between the first starting segment and the first ending segment and parallel to the second side, the second trench having a second starting segment parallel to the second side, parallel to the fourth side a second ending segment opposite to the second starting segment and a second connecting segment between the second starting segment and the second ending segment and parallel to the third side, the third trench having a parallel third a third starting segment of the side, a third ending segment parallel to the first side and opposite the third starting segment, and a third leading segment and a third ending segment and parallel to the fourth side a third connecting section, the fourth groove has a fourth starting section parallel to the fourth side, parallel to the second side, and the fourth a fourth ending segment opposite the beginning segment and a fourth connecting segment between the fourth starting segment and the fourth ending segment and parallel to the first side edge. The voice coil motor of claim 5, wherein the through hole is respectively connected to the first end segment and the first connecting segment, the second ending segment, the second connecting segment, the third ending segment, and the third connection A connecting portion is formed between the segment, the fourth ending segment and the fourth connecting segment, and the through hole is disposed on the connecting portion. The voice coil motor of any one of claims 1 to 6, further comprising: a housing and a carrier body matched with the housing, the housing and the carrier body cooperate to form a capacity The fixing component, the movable component and the elastic piece are accommodated in the accommodating space. The voice coil motor of claim 7, wherein: the first protrusion is provided with a groove for receiving the medium such that the elastic piece is tightly coupled with the first protrusion.