TWI408876B - Voice coil motor actuator - Google Patents

Abstract

The present invention relates to a voice coil motor actuator. The actuator comprises a barrel being used to accept a lens and two springs being located on the two ends of the barrel. The spring includes a flat plate. The flat plate defines a through hole and includes a plurality of connection parts around the through hole. The connection part defines an opening which towards the through hole. The barrel's end defines a plurality of pillars. The number of the pillar is equal to the number of the connection parts. The pillar includes a check part matching with the opening and a block part protruding the check part's side wall. The check part matches with the opening to position. The block part is used to block the connection part movement opposite to the barrel.

Description

Voice coil motor actuator

This invention relates to a motor actuator, and more particularly to a voice coil motor actuator.

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).

In the assembly of the voice coil motor actuator of the prior art, in order to ensure the assembly precision, the positioning cylinder and the corresponding positioning hole are used to pre-position the lens barrel and the elastic piece in the voice coil motor actuator, and the pre-positioning is finished. After that, the dispensing hole is disposed in the positioning hole of the positioning post to fix the corresponding component.

Typically, an assembled voice coil motor actuator requires a drop test to pass the test of a qualified voice coil motor actuator. During the test, the glue at the dispensing site is easy to fall off, which in turn leads to poor stability of the voice coil motor actuator.

In view of this, it is necessary to provide a voice coil motor actuator with better stability.

A voice coil motor actuator comprising: a lens barrel with two open ends, two elastic pieces respectively located at two ends of the lens barrel, the elastic piece has a flat plate, a through hole is arranged in the center of the flat plate, and a plurality of holes are provided a connecting portion around the hole, the connecting portion is provided with a positioning opening with an opening direction facing the through hole, and the lens barrel and the opposite ends of the elastic piece are respectively provided with a positioning column having the same number as the connecting portion, and the positioning column An engaging portion matching the positioning opening and a stopping portion protruding from the engaging portion to the outside of the lens barrel, the engaging portion cooperates with the positioning opening to mount the lens barrel The elastic piece is positioned to prevent the connecting portion of the elastic piece from moving relative to the lens barrel.

Compared with the prior art, the positioning post of the lens barrel of the voice coil motor actuator of the present invention has a latching portion and a stopping portion, and the elastic piece has a positioning opening, and the engaging portion and the stopping portion are opposite to the positioning opening The positioning and fixing of the connecting portion of the lens barrel and the elastic piece are matched. Because of the existence of the engaging portion, the stopping portion and the positioning opening, the conventional use of the adhesive bonding fixing is omitted, and the connecting portion of the elastic piece is closely located at the stopping portion and the lens assembly by the snap fixing manner. Between the end face of the barrel and the end face of the elastic piece, the stability between the lens barrel and the elastic piece is better, and the stability of the lens barrel and the voice coil motor actuator of the elastic piece Preferably.

10‧‧‧ voice coil motor actuator

20‧‧‧ Shell

30‧‧‧Fixed assembly

40‧‧‧The shrapnel

50‧‧‧The event group

60‧‧‧Carrier

22‧‧‧floor

24‧‧‧First side panel

26‧‧‧Second side panel

32‧‧‧ Fixing frame

34‧‧‧ magnet

321‧‧‧First accommodation cavity

41‧‧‧ tablet

411a‧‧‧ first side

411b‧‧‧ second side

411c‧‧‧ third side

411d‧‧‧ fourth side

410‧‧‧through hole

42‧‧‧First trench

43‧‧‧Second trench

44‧‧‧ third trench

45‧‧‧fourth trench

421a‧‧‧First start paragraph

421b‧‧‧ first end

421c‧‧‧first connection segment

46‧‧‧Connecting Department

431a‧‧‧second starting paragraph

431b‧‧‧second end

431c‧‧‧second connection

441a‧‧‧ third starting paragraph

441b‧‧‧ third end

441c‧‧‧ third connection

451a‧‧‧fourth starting paragraph

451b‧‧‧fourth end

451c‧‧‧fourth connection

461‧‧‧ Positioning opening

51‧‧‧Lens cylinder

52‧‧‧ coil

512‧‧‧Second accommodating chamber

513‧‧‧Positioning column

514‧‧‧Contact Department

515‧‧‧stop

70‧‧‧Isolation Box

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a voice coil motor actuator of the present invention.

2 is an exploded view of the voice coil motor actuator of the present invention, which has a spring piece and a movable assembly; Figure 3 is a schematic view of the shrapnel of the voice coil motor actuator of Figure 2; Figure 4 is a schematic view of the movable assembly of the voice coil motor actuator of Figure 2; Figure 5 is the shrapnel of Figure 3 and the activity of Figure 4 a schematic diagram of the combination of the assembly;

The present invention will be specifically described below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2 , a voice coil motor actuator 10 according to an embodiment of the present invention includes a housing 20 , and a fixed assembly 30 having an opening at both ends of the housing 20 , The elastic piece 40 at the two ends of the fixed assembly 30, the movable assembly 50 located in the fixed assembly 30, and a carrier 60 for loading an image sensor (not shown).

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 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.

The fixed assembly 30 has a fixing frame 32 and four magnets 34 mounted in the fixing frame 32. The fixing frame 32 is a frame body having a rectangular parallelepiped shape. The four square side walls of the fixing frame 32 define a first accommodating cavity 321 for receiving the movable assembly 50.

Referring to FIG. 3 together, the elastic piece 40 has a square flat plate 41. The tablet 41 There is a first side 411a, a second side 411b, a third side 411c, and a fourth side 411d. The first side 411a is parallel to the third side 411c, and the second side 411b is parallel to the fourth side 411d. The geometric center of the flat plate 41 defines a through hole 410 for allowing light to enter or exit the lens. The flat plate 41 is further provided with a first groove 42, a second groove 43, a third groove 44 and a fourth groove 45. The first trenches 42 , the second trenches 43 , the third trenches 44 , and the fourth trenches 45 are distributed around the through holes 410 .

The first trench 42 has a first starting segment 421a parallel to the first side 411a, a first ending segment 421b parallel to the third side 411c and opposite to the first starting portion 421a, and a first starting segment 421a. a first connecting section 421c between the first end section 421b and the second side 411b. A connecting portion 46 is formed between the first connecting portion 421c and the first ending portion 421b and the through hole 410.

The second groove 43 has a second starting portion 431a parallel to the second side 411b, a second ending portion 431b parallel to the fourth side 411d and opposite to the second starting portion 431a, and located in the second A second connecting segment 431c between the initial segment 431a and the second ending segment 431b and parallel to the third side 411c. A connecting portion 46 is formed between the second connecting portion 431c and the second ending portion 431b and the through hole 410.

The third groove 44 has a third starting segment 441a parallel to the third side 411c, a third ending segment 441b parallel to the first side 411a and opposite to the third starting portion 441a, and a third A third connecting segment 441c between the initial segment 441a and the third ending segment 441b and parallel to the fourth side 411d. A connection portion 46 is formed between the third connection segment 441c and the third end segment 441b and the through hole 410.

The fourth groove 45 has a fourth starting portion 451a parallel to the fourth side 411d, a fourth ending portion 451b parallel to the second side 411b and opposite to the fourth starting portion 451a, and located at the fourth A fourth connecting segment 451c between the beginning segment 451a and the fourth ending segment 451b and parallel to the first side edge 411a. A connection portion 46 is formed between the fourth connection segment 441c and the fourth end segment 441b and the through hole 410.

Each of the four connecting portions 46 defines a positioning opening 461 opening toward the through hole 410. The positioning opening 461 is used to position the elastic piece 40 with the movable assembly 50. In this embodiment, the positioning opening 461 has a circular arc shape.

Referring to FIG. 4 , the movable assembly 50 is mounted in the first accommodating cavity 321 of the fixed assembly 30 . The movable assembly 50 has a lens barrel 51 and a coil 52 wound around the outer wall of the lens barrel 51.

The lens barrel 51 is a square structure having a substantially circular second receiving cavity 512. The second accommodating cavity 512 is for receiving a lens (not shown). The sidewall of the second accommodating cavity 512 extends in a direction parallel to the central axis of the lens barrel 51 to form eight positioning posts 513. Of the eight positioning posts 513, four are evenly distributed on the top of the lens barrel 51, and four are evenly distributed on the bottom of the lens barrel 51 for positioning with the elastic piece 40.

Of course, the number of the positioning posts 513 at one end of the lens barrel 50 may also be two, three or plural.

The positioning post 513 has an engaging portion 514 matching the positioning opening 461 of the elastic piece 40 and a stopping portion 515 protruding from the engaging portion 514 to the outside of the lens barrel 51 to the side wall of the engaging portion 514. The engaging portion 514 cooperates with the positioning opening 461 The lens barrel 51 is positioned with the elastic piece 40. The stopping portion 51 is for blocking the movement of the connecting portion 46 of the elastic piece 40 relative to the lens barrel 51. Preferably, in the embodiment, the engaging portion 514 has a cylindrical structure, and the engaging portion 514 and the stopping portion 515 are perpendicular to each other. Of course, the engaging portion 514 can also be not perpendicular to the stopping portion 515.

In this embodiment, the engaging portion 514 is integrally formed with the stopping portion 515.

Of course, the engaging portion 514 and the stopping portion 515 can also be separately formed, and then fixed by integral bonding methods such as gluing, screwing, and the like.

Referring to FIG. 5 , the positioning opening 461 is engaged with the engaging portion 514 of the positioning post 513 to position the elastic piece 40 and the lens barrel 51 of the movable assembly 50, and the connecting portion 46 of the elastic piece 40 is closely located. The stopping portion 515 and the end surface of the lens barrel 51 which is closest to the elastic piece 40 are located.

Of course, the engaging portion 514 can also be a square cylinder. In this case, the positioning opening 461 is correspondingly a square opening, and the stopping portion 515 is correspondingly a square structure, a triangular structure, a pentagonal structure or a hexagon. Other structures such as structures.

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.

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. Any equivalent modifications or variations made by those who are familiar with the skill of the present invention in accordance with the spirit of the present invention shall be Within the scope of the patent application.

50‧‧‧Activity Pack

51‧‧‧Lens cylinder

52‧‧‧ coil

512‧‧‧Second accommodating chamber

513‧‧‧Positioning column

514‧‧‧Contact Department

515‧‧‧stop

Claims (5)

A voice coil motor actuator comprising: a lens barrel with two open ends, two elastic pieces respectively located at two ends of the lens barrel, the elastic piece has a flat plate, a through hole is arranged in the center of the flat plate, and a plurality of holes are provided a connecting portion around the hole, the connecting portion is provided with a positioning opening with an opening direction facing the through hole, and the lens barrel and the opposite ends of the elastic piece are respectively provided with a positioning column having the same number as the connecting portion, and the improvement is The positioning post has an engaging portion matching the positioning opening and a stopping portion protruding from the engaging portion to the outside of the lens barrel, the engaging portion of the positioning post and the positioning post The stopping portions are perpendicular to each other, and the engaging portion cooperates with the positioning opening to position the lens barrel and the elastic piece, and the stopping portion is configured to prevent the connection portion of the elastic piece from moving relative to the lens barrel. The voice coil motor actuator of claim 1, wherein the engaging portion of the positioning post is a cylinder, and the positioning opening has a circular arc shape. The voice coil motor actuator of claim 1, wherein the engaging portion of the positioning post is a square cylinder, and the positioning opening has a square shape. The voice coil motor actuator of claim 3, wherein the stop portion has a triangular, square, pentagonal or hexagonal configuration. The voice coil motor actuator of claim 1, 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 lens barrel and the two elastic pieces are accommodated in the receiving space.