TWI452375B - Voice coil motor - Google Patents

Description

Voice coil motor

The invention relates to a 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.) (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 previous voice coil motor, in order to ensure the assembly accuracy, 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. After the pre-positioning, the elastic piece is accommodated. The positioning hole of the positioning post is dispensed to fix the corresponding component.

Usually, the assembled voice coil motor needs to pass the drop test, and the qualified voice coil motor can enter the market. During the test, due to the miniaturization of the voice coil motor, the dispensing space between the shrapnel and the lens barrel is insufficient. Therefore, when the drop test is performed, the combination of the shrapnel and the lens barrel is often insufficient, resulting in the shrapnel falling off. This in turn results in poor stability of the voice coil motor.

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

A voice coil motor includes a lens barrel holder open at both ends, and two flat plate springs respectively located at two ends of the lens barrel carrier, the plate spring piece having an inner frame, an outer frame and connecting the inner The frame and the outer frame are located at the elastic portion between the inner frame and the outer frame. The two ends of the lens holder are respectively provided with positioning posts, and the inner frame of the flat plate is provided with a positioning unit, and the positioning unit has a positioning unit And a positioning surface of the positioning column, the positioning unit cooperates with the positioning column to position the flat elastic piece on the two ends of the lens holder, the surface of the positioning unit and the positioning column is a rough surface, and the positioning column Fixed by dispensing.

Compared with the prior art, since the surface of the positioning unit of the voice coil motor flat plate and the positioning post is a rough surface, the glue is fixed when the positioning unit of the flat elastic piece is fixed with the positioning post of the lens holder. Penetrating into the pores of the rough surface and storing in the pores, so that the glue adheres more firmly to the surface of the positioning unit, so that the bonding between the flat elastic piece and the positioning post is stronger, and the flat elastic piece is made It is fixed on the lens holder. In the fall test and the usual use process, since the flat elastic piece is firmly coupled with the lens barrel carrier, the flat elastic piece is not easily detached from the lens barrel carrier, and therefore, the stability of the voice coil motor is better.

10‧‧‧ voice coil motor

30‧‧‧Fixed assembly

32‧‧‧ Fixing frame

34‧‧‧ magnet

40‧‧‧Activity Pack

41‧‧‧Mirror holder

42‧‧‧ coil

50‧‧‧Slides

51‧‧‧through hole

52‧‧‧Front frame

53‧‧‧ inside frame

54‧‧‧Flexing Department

55‧‧‧ Terminals

321‧‧‧First accommodation cavity

323‧‧‧ prism

324‧‧‧First positioning column

410‧‧‧ top

411‧‧‧ bottom

412‧‧‧Second accommodating chamber

413‧‧‧Second positioning column

521‧‧‧Positioning holes

531‧‧‧ Positioning unit

532‧‧‧ bottom

533‧‧‧ surface

FIG. 1 is an exploded perspective view of a voice coil motor according to an embodiment of the present invention.

2 is a schematic structural view of a flat plate spring of a voice coil motor according to an embodiment of the present invention.

FIG. 3 is a schematic structural diagram of another flat plate spring of a voice coil motor according to an embodiment of the present invention.

The invention will be further described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 , which is a voice coil motor 10 according to an embodiment of the present invention, which can be used by a lens module (not shown). The voice coil motor 10 includes: a fixed assembly 30 having two ends open, a movable assembly 40 received in the fixed assembly 30 and having two ends open, and two flat plates respectively located at opposite ends of the fixed assembly 30. Shrapnel 50.

The fixed assembly 30 has a mounting bracket 32 and four magnets 34 mounted in the mounting bracket 32. The holder 32 is a frame 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. A prism 323 is formed at the intersection of adjacent side walls such that the holder 32 has four prisms 323. The four prisms 323 of the fixing frame 32 extend toward the bottom of the fixing frame 32 in a direction parallel to the central axis of the fixing frame 32 to form four first positioning posts 324, and four first positioning posts 324 are formed to extend toward the top of the fixing frame 32. The first positioning post 324 is a cylinder, and the first positioning post 324 is used to position the flat elastic piece 50 relative to the fixing frame 32.

It can be understood that the first positioning post 324 can also be separately formed, and then fixed to the fixing frame 32 by a glue bonding, a screw connection or the like.

The movable assembly 40 is mounted in the first accommodating cavity 321 of the fixed assembly 30, and the movable assembly 40 is movable relative to the fixed assembly 30 along the central axis of the fixed assembly 30. The movable assembly 40 has a barrel carrier 41 and a coil 42 wound around the outer wall of the barrel holder 41. A cylindrical second accommodating cavity 412 is defined in the center of the lens holder 41. The second accommodating cavity 412 is configured to receive a lens barrel (not shown) in the lens module. The lens holder 41 has an opposite top portion 410 and a bottom portion 411. Four second positioning posts 413 are equally distributed in the circumferential direction of the second receiving cavity 412 at the top portion 410. Similarly, the bottom portion 411 is along the second portion. The accommodating cavity 412 is equiangularly distributed with four second positioning posts 413 (not shown), and the second positioning post 413 is a radial intercept The surface is a semi-circular semi-cylindrical body. The second positioning post 413 is used to position the flat elastic piece 50 relative to the lens barrel carrier 41.

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

Please refer to FIG. 1 and FIG. 2 together. FIG. 2 is a schematic structural diagram of a flat plate spring of a voice coil motor according to an embodiment of the present invention. The flat elastic piece 50 has an inner frame 53 , an outer frame 52 , an elastic portion 54 connecting the inner frame 53 and the outer frame 52 between the inner frame 53 and the outer frame 52 , and the outer frame 52 . Terminal 55. The inner frame 53 of the flat elastic piece 50 defines a through hole 51 through which light can pass. The structure of the two flat slabs 50 is identical except that the length of the terminal 55 is different.

The four corners of the outer frame 52 are respectively provided with positioning holes 521 for use with the first positioning post 324. The positioning hole 521 cooperates with the first positioning post 324 to position the outer frame 52 of the flat elastic piece 50 relative to the fixing frame 32, and the flat elastic piece 50 is dispensed between the inner wall of the positioning hole 521 and the first positioning post 324 by dispensing. It is fixed to the fixing frame 32.

The inner frame 53 is provided with a positioning unit 531. In the embodiment, the positioning unit 531 is a positioning slot, and the opening of the positioning slot faces the through hole 51 and communicates with the through hole 51. The positioning groove has a bottom surface 532 which is a rough surface, and the rough surface is a porous structure, and the rough surface can be etched by sputtering etching, ion beam etching, plasma etching, and reactive ion beam etching. A form. The arithmetic mean deviation Ra of the contour of the rough surface ranges from 5 micrometers to 25 micrometers. The positioning slot cooperates with the second positioning post 413 to position the flat elastic piece 50 relative to the lens barrel carrier 41, and the flat elastic piece 50 is fixed to the lens barrel carrier by dispensing between the positioning groove and the second positioning post 413. 41.

Since the bottom surface 532 of the positioning groove is a rough surface and is a porous structure, when the glue drops between the bottom surface 532 of the positioning groove and the second positioning post 413, the glue penetrates into the porous structure of the rough surface. And stored in the pores of the porous structure, the glue is more firmly attached to the bottom surface 532 of the positioning groove. In this way, the adhesion between the bottom surface 532 and the second positioning post 413 is stronger, so that the flat elastic piece 50 is firmly fixed to the lens barrel carrier 41. During the fall test and the usual use, since the flat elastic piece 50 is firmly coupled with the lens barrel holder 41, the flat elastic piece 50 is not easily detached from the lens barrel holder 41, and therefore, the voice coil motor 10 is stable. Better sex.

Please refer to FIG. 1 and FIG. 3 together. FIG. 3 is a schematic structural diagram of another flat plate spring of a voice coil motor according to an embodiment of the present invention. The structure of the flat plate is the same as that of the flat plate. Further, the inner frame 53 of the flat plate 50 has a surface 533 which is in contact with the top portion 410 of the lens holder 41. The surface 533 is a rough surface. The rough surface is a porous structure which can be formed by one of etching methods such as sputtering etching, ion beam etching, plasma etching, and reactive ion beam etching. The arithmetic mean deviation Ra of the contour of the rough surface ranges from 5 micrometers to 25 micrometers. The positioning slot cooperates with the second positioning post 413 to position the flat elastic piece 50 relative to the lens barrel carrier 41, and dispenses between the bottom surface 532 of the positioning groove and the second positioning post 413 on the surface of the inner frame 53. The 533 is dispensed between the top 410 of the lens holder 41 and the flat elastic piece 50 is fixed to the lens holder 41.

Since the bottom surface 532 of the positioning groove is a rough surface, and the surface 533 of the inner frame 53 of the flat plate elastic piece 50 contacting the lens barrel bearing seat 41 is a rough surface, the rough surface is a porous structure. Therefore, when the glue is dropped between the bottom surface 532 of the positioning groove and the second positioning post 413, between the inner frame 53 of the flat elastic piece 50 and the lens barrel holder 41, The glue penetrates into the porous structure of the rough surface and is stored in the pores of the porous structure, so that the glue adheres more firmly to the bottom surface 532 of the positioning groove and the surface 533, so that the bottom surface 532 and the second surface The bonding between the positioning posts 413 is stronger, so that the surface 533 of the inner frame 53 and the lens holder 41 are more firmly bonded, so that the flat elastic piece 50 is firmly fixed to the lens holder 41. During the fall test and the usual use, since the flat elastic piece 50 is firmly coupled with the lens barrel holder 41, the flat elastic piece 50 is not easily detached from the lens barrel holder 41, and therefore, the voice coil motor 10 is stable. Better sex.

Of course, the second positioning post 413 disposed on the lens holder 41 can also be a cylinder, and the positioning unit 531 of the flat elastic piece 50 matched with the second positioning post 413 should be a positioning hole. The number of the second positioning post 413 of the mating lens holder 41 and the positioning unit 531 of the flat elastic piece 50 is not limited, and may be two, three or five or the like.

It can be understood that the surface of the positioning hole 521 of the outer frame 52 of the flat elastic piece 50 can also be designed as a rough surface. The flat elastic piece 50 is dispensed by the positioning hole 521 and the first positioning post 324 of the fixing frame 32. It is fixed to the fixing frame 32.

In addition, the voice coil motor 10 may also include only one flat elastic piece 50. The shape of the outer frame 52 of the flat elastic piece 50 may also be other geometric shapes such as a pentagon or a hexagon.

The coil 42 is connected to the external circuit to energize the coil 42. The energized coil 42 is subjected to a force in the magnetic field generated by the fixed assembly 30 to drive the lens holder 41 to move along the central axis of the lens holder 41. When the coil 42 is de-energized, the elastic restoring force of the flat elastic piece 50 drives the lens barrel holder 41 back to the initial position. Moreover, the flat elastic piece 50 can provide a buffering force to the voice coil motor 10 when the lateral direction of the voice coil motor 10 is impacted by an external force, thereby protecting the voice coil motor 10 to have a long service life.

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.

50‧‧‧Slides

51‧‧‧through hole

52‧‧‧Front frame

53‧‧‧ inside frame

54‧‧‧Flexing Department

55‧‧‧ Terminals

521‧‧‧Positioning holes

531‧‧‧ Positioning unit

532‧‧‧ bottom

Claims (5)

A voice coil motor includes a lens barrel holder open at both ends, and two flat plate springs respectively located at two ends of the lens barrel carrier, the plate spring piece having an inner frame, an outer frame and connecting the inner The frame and the outer frame are located at the elastic portion between the inner frame and the outer frame. The two ends of the lens holder are respectively provided with positioning posts, and the inner frame of the flat plate is provided with a positioning unit, and the positioning unit has a positioning unit The surface of the positioning unit cooperates with the positioning column to position the plate springs on the two ends of the lens holder. The improvement is that the surface of the positioning unit and the positioning column are rough surfaces. The positioning post is fixed by dispensing; the inner frame of the flat elastic has two opposite surfaces, and one of the two surfaces is a rough surface, and both ends of the lens holder are fixed by dispensing. The voice coil motor of claim 1, wherein the rough surface has an arithmetic mean deviation of 5 micrometers to 25 micrometers. The voice coil motor of claim 1, wherein the rough surface is a porous structure. The voice coil motor of claim 1, wherein the rough surface is a surface formed by one of a splash etching, an ion beam etching, a plasma etching, and a reactive ion beam etching. The voice coil motor of claim 1, wherein the positioning unit is a positioning hole or a positioning groove.