TWI418121B - Spring plate and voice voil motor actuator - Google Patents

Description

Shrapnel and voice coil motor actuator

The present invention relates to a voice coil motor actuator, and more particularly to a resiliently resilient shrapnel and a voice coil motor actuator using the same.

The voice coil motor actuator 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.) (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 actuator mainly includes a fixing frame and a charging tube and at least one elastic piece movably mounted in the fixing frame. 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 actuator. In the case of power-on, the voice coil motor actuator 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.

Referring to FIG. 1, the conventional voice coil motor actuator shrapnel 100 has elongated grooves 101 and 102 and a movable elastic portion 103 between the two grooves 101 and 102.

However, the movable elastic portion 103 is a single movable portion, so that the toughness is not good, so that the voice coil motor actuator using the elastic piece 100 has poor shock resistance, is easily damaged by vibration, and thus shortens the voice coil motor. The life of the actuator.

In view of the above, it is necessary to provide a shrapnel with better toughness and a voice coil motor actuator having the shrapnel.

A shrapnel of a voice coil motor actuator, the shrapnel having a square flat plate having a first side, a second side, a third side, and a fourth side, the first side and the third side The second side is parallel to the fourth side, and the flat plate is provided with a through hole, and the first groove, the second groove, the third groove and the fourth groove are opened around the through hole. The first groove has a first portion parallel to the first side, a second portion parallel to the second side, and a third portion parallel to the third side, the second groove having a first portion parallel to the second side, a second portion parallel to the third side, and a third portion parallel to the fourth side, the third groove having a first portion parallel to the third side, a second portion parallel to the fourth side, a third portion parallel to the first side, the fourth groove having a first portion parallel to the fourth side and a second parallel to the first side a portion and a third portion parallel to the second side, the first trench, the second trench, the third trench, and the fourth trench It defines alternately on the plate, so that the elastic force of the movable portion is formed between two adjacent trenches. A second portion of the first trench and a third portion of the first trench form a connection portion with the via.

A voice coil motor actuator includes a barrel and two spring pieces. The elastic piece has a square flat plate, and the flat plate has a first side, a second side, a third side, and a fourth side The first side is parallel to the third side, and the second side is parallel to the fourth side. The flat plate defines a through hole, and the first groove and the second groove are formed around the through hole. a third groove and a fourth groove, the first groove having a first portion parallel to the first side, a second portion parallel to the second side, and a third parallel to the third side a second portion having a first portion parallel to the second side, a second portion parallel to the third side, and a third portion parallel to the fourth side, the third groove having a first portion parallel to the third side, two portions parallel to the fourth side, and a third portion parallel to the first side, the fourth groove having a first portion parallel to the fourth side, a second portion parallel to the first side and a third portion parallel to the second side, the first trench, the second trench, the third trench and the fourth trench are alternately opened Forming a movable elastic portion between the adjacent grooves on the flat plate, the second portion of the first groove and the third portion of the first groove A connecting portion is formed between points of the through hole. The two elastic pieces are located at two ends of the loading cylinder and are at least partially fixed to the loading cylinder by the connecting portion of the elastic piece.

Compared with the prior art, the movable elastic portion of the elastic piece provided by the embodiment of the present invention is formed into a substantially L shape by a first portion of a groove and a second portion and a third portion of another groove adjacent thereto. The non-single movable section has a suitable rounded corner at the turning portion of the movable elastic portion, which reduces the degree of stress concentration, so that the elastic piece has better toughness, and the voice coil motor actuator using the elastic piece is more resistant to earthquakes, and further This voice coil motor actuator has a long service life.

100, 50‧‧‧ shrapnel

101, 102‧‧‧ trench

103‧‧‧Removable elastic department

10‧‧‧ voice coil motor actuator

20‧‧‧ Shell

30‧‧‧Fixed assembly

40‧‧‧Activity Pack

60‧‧‧Carrier

22‧‧‧floor

24‧‧‧First side panel

26‧‧‧Second side panel

222, 510‧‧‧through holes

25a, 25b‧‧‧ terminal slot

32‧‧‧ Fixing frame

34‧‧‧ magnet

321‧‧‧First accommodation cavity

322‧‧‧Magnetic Department

323‧‧‧Edge

324‧‧‧First positioning column

325‧‧‧ Groove

41‧‧‧Packing

42‧‧‧ coil

412‧‧‧Second accommodating chamber

413‧‧‧Second positioning column

414‧‧‧ dispensing groove

51‧‧‧ tablet

511a‧‧‧ first side

511b‧‧‧ second side

511c‧‧‧ third side

511d‧‧‧ fourth side

52‧‧‧First groove

53‧‧‧Second trench

54‧‧‧ third trench

55‧‧‧fourth trench

521a‧‧‧First start paragraph

521b‧‧‧first end

521c‧‧‧first connection segment

56‧‧‧Connecting Department

561‧‧‧ first notch

562‧‧‧second notch

563‧‧‧through holes

531a‧‧‧second starting paragraph

531b‧‧‧second end

531c‧‧‧second connection

57a‧‧‧First movable elastic department

541a‧‧‧ third starting paragraph

541b‧‧‧ third end

541c‧‧‧ third connection

57b‧‧‧Second movable elastic department

551a‧‧‧Fourth starting paragraph

551b‧‧‧ fourth end

551c‧‧‧fourth connection

57c‧‧‧ Third Movable Elastic Department

57d‧‧‧4th movable elastic department

58‧‧‧Outer fixed part

582‧‧‧Positioning holes

50a, 50b‧‧‧ lead terminals

70‧‧‧Isolation Box

Figure 1 is a schematic illustration of a shrapnel in the prior art.

2 is a perspective view of a voice coil motor actuator in an embodiment of the present invention.

3 is an exploded view of the voice coil motor actuator of the embodiment of the present invention, including a fixed frame, a movable assembly, and a spring.

Figure 4 is a schematic illustration of a mounting bracket in a voice coil motor actuator in accordance with an embodiment of the present invention.

Figure 5 is a schematic illustration of a movable assembly of a voice coil motor actuator in accordance with an embodiment of the present invention.

Figure 6 is a schematic illustration of a shrapnel in a voice coil motor actuator in accordance with an embodiment of the present invention.

Referring to FIG. 2 and FIG. 3 together, it is a voice coil motor actuator 10 according to an embodiment of the present invention. The voice coil motor actuator 10 can be used by a lens module (not shown). The voice coil motor actuator 10 includes a housing 20, a fixed assembly 30, a movable assembly 40, two elastic pieces 50, and a carrier 60.

The housing 20 is used to eliminate interference from external electromagnetics to the voice coil motor actuator 10 and to prevent electromagnetic interference of the voice coil motor actuator 10 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 bottom plate 22, two first side plates 24 disposed on opposite sides of the bottom plate 22, and two second side plates 26 disposed on opposite sides of the bottom plate 22. The bottom plate 22, the two first side plates 24 and the two second side plates 26 form an accommodating space for accommodating the fixed assembly 30. A geometrical center of the bottom plate 22 defines a through hole 222 for the light to enter the lens module. Two terminal slots 25a and 25b are defined in one of the two first side plates 24.

The fixed assembly 30 has a fixing frame 32 and four magnets 34 mounted in the fixing frame 32. Referring to FIG. 4 together, the fixing frame 32 is a frame body having a rectangular parallelepiped shape. The four rectangular side walls of the fixing frame 32 define a first accommodating cavity 321 , and the first accommodating cavity 321 is used to accommodate the activity pack 40. A magnetic portion 322 is defined on each of the rectangular side walls for placing the magnet 34. The four ribs 323 of the fixing frame 32 parallel to the central axis thereof extend toward the bottom of the fixing frame 32 along the central axis direction of the fixing frame 32 to form four first positioning posts 324 extending toward the top of the fixing frame 32 to form four first positioning posts. 324. The first positioning post 324 is used to position the fixing frame 32 and the elastic piece 50. A groove 325 is defined in one of the four ribs 323.

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, screwing, and the like.

Referring to FIG. 5 , the movable assembly 40 is installed in the first accommodating cavity 321 of the fixed assembly 30 . The movable assembly 40 has a loading cylinder 41 and a coil 42 wound around the outer wall of the loading cylinder 41. The cartridge 41 is a square structure having 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 central axis of the cartridge 41 to form eight second positioning posts 413. Of the eight second positioning posts 413, four are evenly distributed on the top of the loading cylinder 41, and four are evenly distributed on the bottom of the loading cylinder 41 for positioning with the elastic piece 50. Two dispensing grooves 414 are formed in the vicinity of each of the second positioning posts 413. The dispensing grooves 414 can be injected with glue, so that the loading tube 41 is glued to the elastic piece 50. The ends of the coil 42 can be respectively connected to the adjacent elastic piece 50.

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 fixing methods such as gluing, screwing, and the like.

Referring to FIG. 6 together, the elastic piece 50 has a square flat plate 51 having a first side 511a, a second side 511b, a third side 511c and a fourth side 511d. The first The one side 511a is parallel to the third side 511c, and the second side 511b is parallel to the fourth side 511d. The geometric center of the flat plate 51 defines a through hole 510 for light to enter or exit the lens module. A first trench 52, a second trench 53, a third trench 54, and a fourth trench 55 are further formed around the via 510.

The first trench 52 has a first starting segment 521a parallel to the first side 511a, a first ending segment 521b parallel to the third side 511c and opposite the first starting portion 521a, and a first starting segment 521a. The first connecting segment 521c is between the first ending segment 521b and the first ending segment 521b, wherein the length of the first ending segment 521b is less than or equal to the length of the first starting segment 521a. A connecting portion 56 is formed between the first connecting portion 521c and the first ending portion 521b and the through hole 510. The connecting portion 56 defines a first recess 561 opening toward the through hole 510, a second recess 562 opening toward the through hole 510, and two through holes 563 on opposite sides of the first recess 561. The wall around the first recess 561, the wall around the second recess 563, and the wall around the through hole 510 are connected to form a curved surface. The first recess 561 cooperates with the second positioning post 413 to position and fix the elastic piece 50 and the loading cylinder 41. The second recess 562 can be connected to one end of the coil 42 by soldering. The through hole 563 can be glued to the dispensing groove 414 by a dispensing method, so that the elastic piece 50 and the charging tube 41 are more firmly fixed together.

It can be understood that the first recess 561 can also be a through hole whose central axis is parallel to the central axis of the through hole 510, and is not limited to the embodiment, as long as it can cooperate with the second positioning post 413 to lock the elastic piece 50 and the loading cylinder 41. Position and fix it.

The second groove 53 has a second starting portion 531a parallel to the second side 511b, a second ending portion 531b parallel to the fourth side 511d and opposite to the second starting portion 531a, and located in the second Between the initial segment 531a and the second ending segment 531b and with the third side 511c The second connecting section 531c is parallel, wherein the length of the second ending section 531b is less than or equal to the length of the second starting section 531a. The second starting segment 531a and the second connecting segment 531c are located on the outer side of the first trench 52 to form a first movable elastic portion 57a with the first connecting segment 521c and the first ending segment 521b of the first trench 52. . A connecting portion 56 is formed between the second connecting portion 531c and the second ending portion 531b and the through hole 510.

The third groove 54 has a third starting portion 541a parallel to the third side 511c, a third ending portion 541b parallel to the first side 511a and opposite to the third starting portion 541a, and located in the third The third connecting segment 541c between the initial segment 541a and the third ending segment 541b and parallel to the fourth side 511d, wherein the length of the third ending segment 541b is less than or equal to the length of the third starting segment 541a. The third starting segment 541a and the third connecting segment 541c are located on the outer side of the second groove 53, so that a second movable elastic portion 57b is formed between the second connecting portion 531c and the second ending portion 531b of the second groove 53. . A connection portion 56 is formed between the third connection segment 541c and the third end segment 541b and the through hole 510.

The fourth groove 55 has a fourth starting segment 551a parallel to the fourth side 511d, a fourth ending segment 551b parallel to the second side 511b and opposite to the fourth starting portion 551a, and located at the fourth A fourth connecting segment 551c between the beginning segment 551a and the fourth ending segment 551b and parallel to the first side edge 511a, wherein the length of the fourth ending segment 551b is less than or equal to the length of the fourth starting segment 551a. The fourth starting segment 551a and the fourth connecting segment 551c are located on the outer side of the third trench 54 to form a third movable elastic portion 57c with the third connecting segment 541c and the third ending segment 541b of the third trench 54. . The fourth connecting portion 551c and the fourth ending portion 551b are located inside the first groove 52, so as to form a fourth movable elastic portion 57d with the first starting portion 521a and the first connecting portion 521c of the first groove 52. The fourth connecting segment 541c and the fourth ending segment 541b form a connection with the through hole 510. Part 56.

The outer side of the first start segment 521a of the first trench 52, the outer side of the second start segment 531a of the second trench 53, the outer side of the third start segment 541a of the third trench 54, and the fourth trench 55 An outer fixing portion 58 is formed on the outer side of the fourth starting portion 551a. The outer fixing portion 58 defines four positioning holes 582 for use with the first positioning post 324. The positioning hole 582 cooperates with the first positioning post 324 to position and fix the elastic piece 50 and the fixing frame 32. In order to prevent the fixing of the fixing frame 32, the outer fixing portion 58 may be fixed to the bottom and top edges of the fixing frame 32 by gluing and bonding.

It can be understood that the number of the dispensing groove 414 and the through hole 563 may be one, two, three or plural, and is not limited to the embodiment, as long as the elastic piece 50 and the charging tube 41 can be integrally fixed. can. It can also be understood that the connecting portion 56 can also be completely fixed to the area in contact with the top or bottom of the loading cylinder 41 by means of gluing and bonding, as long as the first movable elastic portion 57a and the second movable elastic portion are The 57b, the third movable elastic portion 57c, and the fourth movable elastic portion 57d may not be fixed to the cartridge 41.

In this embodiment, the first trench 52, the second trench 53, the third trench 54, and the fourth trench 55 have the same shape, and the length of the first start segment 521a is the length of the first end segment 521b. 3 times, the length of the second start segment 531a is 3 times the length of the second end segment 531b, and the length of the third start segment 541a is 3 times the length of the third end segment 541b, and the fourth start segment 541a The length is three times the length of the fourth end segment 541b, so that the shapes of 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 also the same and substantially L shape. The shape of 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 is substantially L-shaped, not a single movable segment, and the first The turning portions of the movable elastic portion 57a, the second movable elastic portion 57b, the third movable elastic portion 57c, and the fourth movable elastic portion 57d are appropriately rounded to reduce the degree of stress concentration, so that the elastic sheet 50 is preferably tough. .

It can be understood that the length of the first starting segment 521a may also be 1 or 2 times or 4 times or 5 times or other times the length of the first ending segment 521b, and the length of the second starting segment 531a may also be The length of the third end segment 541a may also be 1 or 2 or 4 times the length of the third end segment 541b, which is 1 or 2 times or 4 times or 5 times or other times the length of the second end segment 531b. Or 5 times or other multiples, the length of the fourth starting segment 551a may also be 1 or 2 times or 4 times or 5 times or other times the length of the fourth ending segment 551b, and is not limited to the embodiment, as long as 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 may be formed as a non-single movable portion.

The two elastic pieces 50 also have lead terminals 50a and 50b, respectively. The conductive terminals 50a and 50b are connected to an external circuit such that current flows sequentially through the conductive terminal 50a, the elastic piece 50 having the conductive terminal 50a, one end of the coil 42, the other end of the coil 42, and the conductive terminal 50b. The shrapnel 50 and the lead terminal 50b form a closed loop. The conductive terminals 50a and 50b are similar in structure, and each has an L shape, but the conductive terminal 50a is long and the conductive terminal 50b is short. One end of the guiding terminal 50a is received in the recess 325, and the other end is received in the carrier 60, and one end of the guiding terminal 50b is also received in the carrier 60. After the housing 20 is attached, the two ends of the two lead terminals 50a and 50b accommodated in the carrier 60 are respectively connected to external circuits by the two terminal slots 25a and 25b.

It can be understood that the guiding terminal 50a and the elastic piece 50 can be separately formed, and then integrally fixed to the elastic piece 50 by gluing, screwing or other fixing methods, or can be integrally formed with the elastic piece 50. In this embodiment, the guiding terminal 50a is integrally formed with a resilient piece 50. The lead terminal 50b is also integrally formed with the other elastic piece 50.

The carrier 60 has a square shape and forms a spacer 70 with the outer casing 20. The spacer 70 can be used to eliminate external electromagnetic interference with the voice coil motor actuator 10 and prevent the electromagnetic of the voice coil motor actuator 10 from affecting the operation of its external electronic components.

The conductive terminals 50a and 50b 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 magnets 34, thereby driving the loading cylinder 41 along its central axis. mobile.

It can be understood that the voice coil motor actuator 10 can also directly connect the coil 42 to the external circuit without the lead terminals 50a and 50b, and is not limited to the embodiment, as long as current flows in the coil 42.

It can be understood that the number of the second positioning posts 413 of the first positioning post 324 can also be two, three or plural. It is not limited to the embodiment, and the elastic piece 50 and the fixing frame 32 are positioned in cooperation with the positioning holes 582. And fix it. It can also be understood that the number of the second positioning posts 413 can also be two, three or plural, and is not limited to the embodiment, as long as the first notch 561 cooperates to position and fix the elastic piece 50 and the loading cylinder 41. Just fine.

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 actuator

20‧‧‧ Shell

30‧‧‧Fixed assembly

40‧‧‧Activity Pack

50‧‧‧Shrap

60‧‧‧Carrier

22‧‧‧floor

24‧‧‧First side panel

26‧‧‧Second side panel

222, 510‧‧‧through holes

25a, 25b‧‧‧ terminal slot

32‧‧‧ Fixing frame

34‧‧‧ magnet

321‧‧‧First accommodation cavity

41‧‧‧Packing

42‧‧‧ coil

50a, 50b‧‧‧ lead terminals

Claims (7)

A shrapnel of a voice coil motor actuator, the shrapnel having a square flat plate having a first side, a second side, a third side, and a fourth side, the first side and the third side The second side is parallel to the fourth side, and a through hole is defined in the middle of the flat plate; the first groove, the second groove, the third groove and the fourth groove are formed around the through hole. The first groove has a first portion parallel to the first side and a second portion parallel to the second side, the second groove having a first portion parallel to the second side and a second portion having three sides parallel to each other, the third groove having a first portion parallel to the third side and a second portion parallel to the fourth side, the fourth groove having the fourth side The parallel first portion and the second portion parallel to the first side are improved in that the first trench further has a third portion parallel to the third side, the second trench further having a a third portion of the fourth side parallel, the third groove further having a parallel to the first side In a third part, the fourth trench further has a third portion parallel to the second side, the first trench, the second trench, the third trench, and the first portion of the fourth trench The length of the first groove, the second groove, the third groove and the fourth groove are alternately formed on the flat plate so that the two adjacent grooves are adjacent to each other. An L-shaped movable elastic portion is formed therebetween. The shrapnel of claim 1, wherein the first trench, the second trench, the third trench, and the fourth trench are identical in shape. The shrapnel of claim 2, wherein the second portion of the first trench and the third portion of the first trench form a connection portion with the through hole. A voice coil motor actuator comprising a barrel, the improvement being that the voice coil motor actuator further comprises two pieces of the elastic piece according to claim 3, wherein the two pieces are respectively located in the barrel The end is at least partially fixed to the barrel by the connecting portion of the elastic piece. The voice coil motor actuator of claim 4, wherein the two ends of the cartridge respectively have a dispensing portion, and the dispensing portion of the cartridge is fixed to the connecting portion of the elastic piece. The voice coil motor actuator of claim 5, further comprising a fixing frame and a magnet mounted on the fixing frame, the fixing frame is for receiving the loading tube, the elastic piece further has an outer side The fixing portion is disposed at two ends of the fixing frame and is fixed to the fixing frame by the outer fixing portion of the elastic piece. The voice coil motor actuator of claim 6, further comprising a housing and a carrier body matched with the housing, the housing and the carrier body cooperate to form a receiving space. The fixing frame, the magnet mounted on the fixing frame, the loading cylinder and the two elastic pieces are all accommodated in the receiving space.