TWI437797B - Voice coil motor - Google Patents

Description

Voice coil motor

The present invention relates to a voice coil motor, and more particularly to a lower cost voice coil motor.

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 cameras, etc.).

However, when the lens barrel is screwed into the movable cylinder of the conventional voice coil motor, the movable cylinder is easily rotated, which in turn drives the elastic piece to rotate, thereby increasing the possibility of damage to the elastic piece and increasing the production cost of the voice coil motor.

In view of the above, it is necessary to provide a voice coil motor that prevents the movable barrel from rotating when the lens barrel is screwed in.

A voice coil motor includes a movable barrel opened at both ends and a carrier. The movable charging cylinder is movable relative to the carrying base, and the movable loading cylinder is provided with at least two pre-pressing units near the end surface of the carrying bracket. The carrier has a surface adjacent to the movable barrel and at least two stop units disposed on the surface. The stop unit cooperates with the preload unit to prevent the movable barrel from rotating.

Compared with the prior art, the preloading unit of the movable cylinder provided by the embodiment of the invention cooperates with the stop unit of the carrier to prevent the movable cylinder from rotating when being screwed into the lens barrel, thereby reducing the splint of the elastic piece. Possibly, the cost of the voice coil motor is reduced.

10‧‧‧ voice coil motor

20‧‧‧ Shell

30‧‧‧Fixed assembly

40, 40a‧‧‧ activities group

50a, 50b‧‧‧ shrapnel

60, 60a‧‧‧ bearing seat

22‧‧‧ top board

24‧‧‧First side panel

26‧‧‧Second side panel

222, 510, 601‧‧‧ through holes

32‧‧‧ Fixing frame

34‧‧‧ magnet

321‧‧‧First accommodation cavity

323‧‧‧Edge

324‧‧‧First positioning unit

41, 41a‧‧‧ activities cartridge

42, 42a‧‧‧ coil

412‧‧‧Second accommodating chamber

413‧‧‧First positioning column

414, 414a‧‧‧Preloading unit

51‧‧‧ tablet

53, 53b‧‧‧ lead terminals

511‧‧‧Internal connection

512‧‧‧Outer fixation

513‧‧‧Flex Department

514‧‧‧Second positioning unit

515‧‧‧through section

516‧‧‧Second positioning hole

70‧‧‧Isolation Box

602, 602a‧‧‧ surface

603‧‧‧ notch

604‧‧‧3rd positioning unit

605, 605a‧‧‧stop unit

1 is a schematic perspective view of a voice coil motor in a first embodiment of the present invention.

2 is an exploded perspective view of the voice coil motor in the first embodiment of the present invention, which includes a movable assembly and a carrier.

Figure 3 is a cross-sectional view of the voice coil motor of Figure 1 taken along line III-III.

4 is a perspective view of the movable package and the carrier in FIG.

Fig. 5 is a schematic view showing the movable assembly and the carrier of the voice coil motor in the second embodiment of the present invention.

Please refer to FIG. 1, FIG. 2 and FIG. 3 together, which is a voice coil motor 10 according to an embodiment of the present invention. The voice coil motor 10 includes a housing 20, a fixed assembly 30 that is open at both ends, a movable assembly 40 that is movably received in the fixed assembly 30, and two elastic sheets respectively located at opposite ends of the fixed assembly 30. (50a, 50b) and a carrier 60 integrally fixed to the fixed assembly 30.

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 top plate 22, two first side plates 24 disposed on opposite sides of the top plate 22, and two second side plates 26 disposed on opposite sides of the top plate 22. The top plate 22, the two first side plates 24 and the two second side plates 26 form an accommodation space for accommodating the fixed assembly 30. A geometrical center of the top plate 22 defines a through hole 222 for light to pass through the top plate 22.

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 40. The intersection of the two side walls forms a rib 323 such that the holder 32 has four ribs 323. The four ribs 323 of the fixing frame 32 extend toward the bottom of the fixing frame 32 along the central axis direction of the fixing frame 32 to form four first positioning units 324, and four first positioning units 324 are formed to extend toward the top of the fixing frame 32. The first positioning unit 324 is used to position the fixing frame 32 and the elastic pieces 50a and 50b. In this embodiment, the first positioning unit 324 is a positioning post.

Certainly, the first positioning unit 324 can also be a positioning hole, and the number of the first positioning units 324 can also be two, three or more.

It can be understood that the first positioning unit 324 can also be separately formed, and then fixed to the fixing frame 32 by other bonding methods such as glue bonding, screwing, and the like. It is also understood that the holder 32 may also have no first positioning unit 324.

The activity assembly 40 is movably mounted in the first accommodating cavity 321 of the fixed assembly 30. The movable assembly 40 has a movable cylinder 41 and a coil 42 wound around the outer wall of the movable cylinder 41. The movable cylinder 41 is a square structure having an internal thread and has a substantially circular second accommodating cavity 412. The second accommodating cavity 412 is for receiving a lens barrel (not shown) having an external thread. The internal thread of the movable cylinder 41 is screwed to the outside of the lens barrel to fix the lens barrel and the movable cylinder 41 integrally.

The side wall around the second accommodating cavity 412 extends in a direction parallel to the central axis of the movable package 41 to form eight first positioning posts 413. Of the eight first positioning posts 413, four are equally spaced at the top of the movable cartridge 41 (away from the carrier 60), and four are equally spaced at the bottom of the movable cartridge 41 (near the carrier 60). The first positioning post 413 is used to position and fix the movable cylinder 41 and the elastic piece (50a, 50b).

The front end of the bottom of the movable cylinder 41 is further provided with eight pre-compression units 414. In this embodiment, the pre-pressing unit 414 is a pre-pressing column, and one end thereof is disposed on an end surface of the bottom of the movable charging cylinder 41, and the other end abuts against the bearing base 60.

Of course, the first positioning post 413 and the pre-pressing unit 414 can also be separately formed, and then fixed to the movable loading cylinder 41 by other bonding methods such as gluing, screwing, and the like. It is also understood that the number of the first positioning post 413 and the pre-pressing unit 414 may also be two or three or more.

The elastic piece 50a has a square flat plate 51 and a lead terminal 53 connected to the square flat plate 51. The guiding terminal 53 is used to connect the elastic piece 50a to a power source (not shown) to supply power to the coil 42.

The geometric center of the flat plate 51 defines a through hole 510 through which light can pass.

The flat plate 51 further has an inner connecting portion 511, an outer fixing portion 512, and four elastic portions 513. The inner connecting portion 511 surrounds the through hole 510 and is adjacent to the through hole 510. The outer fixing portion 512 surrounds the through hole 510 and is away from the through hole 510. The four elastic portions 513 surround the through hole 510 and are located between the inner connecting portion 511 and the outer fixing portion 512 .

The inner connecting portion 511 is provided with four second positioning units 514 for use with the first positioning post 413 such that the elastic piece 50a is positioned and fixed integrally with the bottom of the movable loading tube 41. In this embodiment, the second positioning unit 514 is a through hole that does not communicate with the through hole 510, and the second positioning unit 514 is glued to the first positioning post 413 by a dispensing method.

Of course, the first positioning post 413 can also be a positioning post with a mushroom head. In this case, the dispensing process can be omitted, and the elastic piece 50a can be positioned and fixed together with the movable loading tube 41. .

The inner connecting portion 511 is also provided with eight through portions 515. The through portion 515 allows the preload unit 414 to be in contact with the carrier 60. In the present embodiment, the penetrating portion 515 is a notch that faces the through hole 510 in the opening direction and communicates with the through hole 510 . Of course, the through portion 515 can also be a through hole that is separated from the through hole 510.

The outer fixing portion 512 defines four second positioning holes 516 for use with the first positioning unit 324. The second positioning hole 516 cooperates with the first positioning unit 324 to position and fix the elastic piece 50a and the fixing frame 32. In order to prevent the fixing of the fixing frame 32, the second positioning hole 516 and the first positioning unit 324 may be glued, or the outer fixing portion 512 may be glued and bonded to the bottom of the fixing frame 32. The end face is fixed.

The elastic piece 50b is substantially the same as the elastic piece 50a, and has a guiding terminal 53b. The difference is that the guiding terminal 53b of the elastic piece 50b is longer than the guiding terminal 53.

It can be understood that the voice coil motor 10 can also have only one elastic piece 50a or 50b.

Of course, the shape of the elastic portion 513 of the two elastic pieces 50a and 50b may be different.

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 interference from external electromagnetics to the voice coil motor 10 and to prevent electromagnetic interference of the voice coil motor 10 from affecting the operation of its external electronic components.

Referring to FIG. 4 , the carrier 60 has a surface 602 having a through hole 601 in the center, four notches 603 disposed on the surface 602 and communicating with the through hole 601 , and four fixing frames 32 . The first positioning unit 324 cooperates with the third positioning unit 604 and four stop units 605 disposed on the surface 602.

The notch 603 allows the first positioning post 413 located at the bottom of the movable cartridge 41 to pass through the carrier 60 to prevent the carrier 60 from obstructing the movement of the first positioning post 413.

The third positioning unit 604 cooperates with the first positioning unit 324 of the fixing frame 32 to fix the bearing base 60 and the fixing frame 32 integrally. Preferably, in the embodiment, the third positioning unit 604 is a positioning groove, and the first positioning unit 324 is received in the third positioning unit 604. Of course, the third positioning unit 604 can also be a positioning hole or a positioning post.

The stop unit 605 is used in conjunction with the preload unit 414 to prevent the movable barrel 41 from rotating when the lens barrel is screwed into the movable barrel 41.

In this embodiment, the stop unit 605 is a stop block perpendicular to the surface 602, and the height of the stop block along the central axis of the carrier 60 is smaller than the central axis of the preload unit 414 along the movable loading tube 41. The height is such that the inner connecting portion 511 of the elastic piece 50a of the voice coil motor 10 in the unenergized state is in a different plane from the outer fixing portion 512, so that the elastic piece 50a of the voice coil motor 10 in the unenergized state has one. The axial preload (ie, the restoring force) is balanced with the bearing capacity provided by the carrier 60, so that the initial rotation of the movable drum 41 after the voice coil motor 10 in the unenergized state is axially shaken The location will not change. When assembled, the two pre-compression units 414 between the two adjacent first positioning posts 413 cooperate with a stop unit 605 such that the stop unit 605 is between the two pre-compression units 414, thereby When the lens barrel is prevented from being screwed into the movable barrel 41, the movable barrel 41 is rotated.

Since the stop unit 605 is used in cooperation with the pre-pressing unit 414 to prevent the movable barrel 41 from being rotated when the lens barrel is screwed into the movable barrel 41, the possibility of spraining of the elastic pieces 50a and 50b is reduced, and the reduction is reduced. The cost of the voice coil motor 10.

Please refer to FIG. 5, which is a movable assembly 40a and a carrier 60a of a voice coil motor (not shown) provided by the second embodiment of the present invention. The movable assembly 40a has a movable cylinder 41a and a coil 42a wound around the outer wall of the movable cylinder 41a. The movable cylinder 41a is provided with four pre-compression units 414a near the end surface of the carrier 60a. The surface 602a of the carrier 60a is provided with four stop units 605a. The pre-pressing unit 414a is a pre-pressing column, the stopping unit 605a stops the groove, and the depth of the stopping groove along the central axis of the bearing seat 60a is smaller than the central axis of the pre-pressing unit 414a along the movable charging cylinder 41a. The height.

Since the stopper unit 605a is used in cooperation with the pre-pressing unit 414a to prevent the movable barrel 41a from being rotated when the lens barrel is screwed into the movable barrel 41a, the splint is prevented from being sprained, and the voice coil motor is lowered. At the same time, the stop unit 605a cooperates with the pre-pressing unit 414a to prevent the movable barrel 41a from deviating from its central axis when moving in the direction of its central axis, thereby improving the focusing accuracy of the voice coil motor.

Of course, the pre-pressing unit 414a may also be a pre-pressing groove provided on the end surface of the movable charging cylinder 41a close to the bearing base 60a. At this time, the stopping unit 605a stops the column, and the pre-pressing groove is carried along the bearing. The depth of the central axis of the seat 60a is greater than the height of the pre-pressing unit 414a along the central axis of the movable barrel 41a, and the object of the present invention can also be achieved.

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.

40‧‧‧Activity Pack

413‧‧‧First positioning column

414‧‧‧Preloading unit

60‧‧‧ bearing seat

603‧‧‧ notch

604‧‧‧3rd positioning unit

605‧‧‧stop unit

Claims (6)

A voice coil motor comprising: a movable loading cylinder open at both ends, a bearing seat and a elastic piece, the movable charging cylinder is movable relative to the carrying seat, and the movable loading cylinder is provided with at least two end faces of the carrying bracket a pre-pressing unit having a surface adjacent to the movable charging cylinder and at least two stop units disposed on the surface, the stopping unit cooperates with the pre-pressing unit to prevent the movable charging cylinder from rotating, The elastic piece has a through hole and an inner connecting portion surrounding the through hole, and the elastic piece is located between the movable charging tube and the carrying seat, and an inner connecting portion thereof and the movable loading tube are adjacent to the end of the carrying seat The portion is fixedly integrated, and the inner connecting portion is provided with a penetrating portion that allows the pre-pressing unit to be in contact with the carrier. The voice coil motor of claim 1, wherein the pre-pressing unit is a pre-pressing column, one end of which is disposed on an end surface of the movable loading cylinder near the bearing seat, and the other end is in contact with the surface of the bearing seat. . The voice coil motor of claim 2, wherein the stop unit is a stop and the height along the central axis of the carrier is smaller than the height of the pre-press column along the central axis of the movable package. The voice coil motor of claim 2, wherein: the stop unit stops the groove, and the depth along the central axis of the carrier is smaller than the height of the pre-press column along the central axis of the movable package. . The voice coil motor of claim 1, wherein: the pre-pressing unit is a pre-pressing groove, the stopping unit is a stop post, and the height of the stop post along the central axis of the carrier is greater than the pre- The depth of the groove is along the central axis of the movable barrel. The voice coil motor of claim 1, wherein the through portion is connected to the through hole a through hole or a through hole separated from the through hole.