KR102193770B1 - Voice coil motor - Google Patents

Abstract

The voice coil motor includes: a body disposed on a base, a support portion protruding from an outer circumferential surface of the body, and a bobbin having a bobbin groove connecting upper and lower ends of the outer circumferential surface of the body; A pair of first and second elastic members coupled to a lower surface of the bobbin; A coil block supported by the support part and including a first end connected to the first elastic member and a second end wound in a cylindrical shape from the first end and passed through the bobbin groove and connected to the second elastic member; And a magnet facing the coil block and a housing disposed on the base to fix the magnet.

Description

Voice coil motor {VOICE COIL MOTOR}

The present invention relates to a voice coil motor.

BACKGROUND ART In recent years, a camera module for storing an image or a moving picture is installed in a portable communication device, and the camera module includes an image sensor module that converts external light into an image and a lens that focuses external light on the image sensor module.

The conventional camera module cannot adjust the distance between the lens and the image sensor module, making it difficult for a user to obtain a desired image.

Recently, a voice coil motor capable of adjusting a distance between a lens of a camera module and an image sensor module has been developed.

Conventional voice coil motors include a bobbin on which a lens is mounted, a coil wound around the bobbin, and a magnet facing the coil, and a lens mounted on the bobbin using attractive force and repulsive force generated by the action of the magnetic field generated from the coil and magnet. And adjusting the spacing between the image sensor modules.

Since the conventional coil wound on the bobbin has a shape wound on the bobbin, one end of the coil is disposed inside, the other end of the coil is disposed outside, and the other end disposed on the outside of the coil is unwound or separated from other components. It has an interfering problem.

The present invention provides a voice coil motor that improves the structure of a coil wound around a bobbin and a bobbin to prevent loosening of a wire forming a coil and prevent the coil from interfering with other components.

The technical problem to be achieved by the present invention is not limited to the technical problems mentioned above, and other technical problems that are not mentioned can be clearly understood by those of ordinary skill in the technical field to which the present invention belongs from the following description. will be.

In one embodiment, the voice coil motor includes a body disposed on a base, a support portion protruding from an outer peripheral surface of the body, and a bobbin groove formed with a bobbin groove connecting upper and lower ends of the outer peripheral surface of the body; A pair of first and second elastic members coupled to a lower surface of the bobbin; A coil block supported by the support part and including a first end connected to the first elastic member and a second end wound in a cylindrical shape from the first end and passed through the bobbin groove and connected to the second elastic member; And a magnet facing the coil block and a housing disposed on the base to fix the magnet.

According to the voice coil motor according to the present invention, the size of the lens mounted on the bobbin can be further increased, the coil forming the coil block is prevented from unwinding, and the coil block is prevented from interfering with the components around the coil block. The quality and driving performance can be further improved.

1 is an exploded perspective view of a voice coil motor according to an embodiment of the present invention.
2 is an assembly cross-sectional view of FIG. 1.
3 is a bottom perspective view of the bobbin shown in FIG. 1.
4 is a perspective view showing the bobbin, first and second elastic members, and a coil block of FIG. 3.
5 is an enlarged view of a portion'A' of FIG. 4.
6 is a cross-sectional view of a coil block disposed on the bobbin shown in FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms specifically defined in consideration of the configuration and operation of the present invention may vary according to the intention or custom of users or operators. Definitions of these terms should be interpreted as meanings and concepts consistent with the technical idea of the present invention based on the contents throughout the present specification.

1 is an exploded perspective view of a voice coil motor according to an embodiment of the present invention. 2 is an assembly cross-sectional view of FIG. 1.

1 and 2, the voice coil motor 800 includes a base 100, a bobbin 200, first and second elastic members 300 and 400, a coil block 500, a stator 600, and a cover. It may include a can 700. In addition, the voice coil motor 800 may further include a third elastic member 750.

The base 100 serves to fix the bobbin 200, the first and second elastic members 300 and 400, the stator 600 and the cover can 700 to be described later.

The base 100 is formed in, for example, a rectangular parallelepiped plate shape with an opening 105 formed in the center, an IR filter and an image sensor module are mounted on the rear surface of the base 100, and the image sensor module is the base 100 An image corresponding to external light incident through the opening 105 of is generated.

Four coupling pillars 120 protruding in a direction perpendicular to the upper surface 110 are formed at the four corners of the upper surface 110 of the base 100. In addition, bosses 130 coupled to first and second elastic members 300 and 400 to be described later are formed on the upper surface 110 of the base 100.

3 is a bottom perspective view of the bobbin shown in FIG. 1.

1 and 3, the bobbin 200 adjusts the distance between the lens fixed therein and the image sensor module fixed to the rear surface of the base 100.

The bobbin 200 includes a body 210, a support part 220, and a bobbin groove 230.

The body 210, for example, is formed in a hollow cylindrical shape through which external light passes. In one embodiment of the present invention, the body 210 may be formed in a variety of shapes such as the hollow cylinder, square cylinder, polygonal cylinder.

On the outer surface of the body 210, curved portions 212 and flat portions 214 are formed, and each curved portion 212 and each flat portion 214 are alternately formed on the outer surface of the body 210 And, in one embodiment of the present invention, the body 210 has four curved portions 212 and four flat portions 214 are formed alternately.

A plurality of bosses 216 protrude from the bottom of the body 210 of the bobbin 200 facing the upper surface 110 of the base 100 as shown in FIGS. 2 and 3, and the bosses 216 The first and second elastic members 300 and 400 to be described later are fixed. The bosses 216 are disposed to face the upper surface 110 of the base 100.

The support part 220 is formed at the lower end of the outer surface of the body 210, and the support part 220 serves to support the lower surface of the coil block 500 to be described later.

The support part 220 protrudes along the lower end of the outer surface of the body 210, and the support part 220 may protrude from the lower end of the outer surface of the body 210 in a rib shape, for example.

Although in one embodiment of the present invention, the support part 220 is shown and described to be formed in a rib shape along the lower end of the outer surface of the body 210, differently, the support part 220 is the body 210 It is okay to intermittently protrude from the lower end of the outer surface of the plurality.

In one embodiment of the present invention, the support portion 220 formed in a rib shape may be formed with a cutout portion 222 partially cut or removed, and the cutout portion 222 may be formed of a coil block 500 to be described later. The first end and the second end pass.

A guide protrusion 226 is formed at a position corresponding to the cutout 222, the upper surface of the guide protrusion 226 is disposed at a position lower than the upper surface of the support part 220, and the guide protrusion 226 is the support part ( 220).

The bobbin 200 is formed concave from the outer circumferential surface of the body 210 exposed by the cutout 222 and is electrically connected to the first and second ends of the first and second elastic members 300 and 400 to be described later. It may include an exposed portion 224 for increasing the exposed area of the portion.

The bobbin groove 230 is formed in a direction toward an upper end of the outer surface of the body 210 and a lower end facing the upper end, and the bobbin groove 230 has a groove shape on the outer surface of the body 210 It can be formed as The bobbin groove 230 is formed in a size suitable for passing one end of the coil block 500 to be described later.

The bobbin groove 230 may be formed in a portion where the curved portion 212 and the flat portion 214 of the body 210 meet, for example.

4 is a perspective view showing the bobbin, first and second elastic members, and a coil block of FIG. 3. 5 is an enlarged view of a portion'A' of FIG. 4.

1, 4 and 5, the first elastic member 300 and the second elastic member 400 are disposed on the lower surface of the bobbin 200, and the first and second elastic members 300 and 400 are bobbins. It serves to support (200) flexibly.

The first elastic member 300 and the second elastic member 400 disposed on the lower surface of the bobbin 200 are spaced apart from each other and are not electrically contacted.

The first elastic member 300 and the second elastic member 400 are formed in a mutually symmetrical shape with respect to the center of the bobbin 200. The first and second elastic members 300 and 400 include inner elastic parts 310 and 410, outer elastic parts 320 and 420, and connection elastic parts 330 and 430, respectively.

The inner elastic parts 310 and 410 are formed in a semicircular plate shape when viewed from the top, and through holes 312 and 412 are formed in the inner elastic parts 310 and 410 that are coupled with the boss 216 formed on the lower surface of the bobbin 200. . The inner elastic parts 310 and 410 are fixed to the lower surface of the bobbin 200.

The outer elastic parts 320 and 420 are disposed outside the inner elastic parts 310 and 410, and the outer elastic parts 320 and 420 are formed in a semicircular plate shape when viewed from the top. The outer elastic portions 320 and 420 are formed with through holes 322 and 422 that are coupled to the boss 130 formed on the upper surface 110 of the base 100.

Terminal portions 315 and 415 for receiving power from the outside are formed on the outer elastic portions 320 and 420, and the terminal portions 315 and 415 are electrically connected to an external circuit board or the like through the base 100.

The connection elastic parts 330 and 430 resiliently connect the inner elastic parts 310 and 410 and the outer elastic parts 320 and 420, and the connection elastic parts 330 and 430 are formed in a zigzag shape when viewed from a plane in order to generate an elastic force.

Meanwhile, a third elastic member 750 may be elastically coupled to the upper end of the bobbin 200 at the upper end of the bobbin 200. As shown in FIG. 1, the third elastic member 750 includes an inner elastic portion 751 coupled to the upper surface of the bobbin 200, an outer elastic portion 752 coupled to the upper portion of the housing 620, and It may include a connection elastic portion 753 connecting the inner elastic portion 751 and the outer elastic portion 752.

6 is a cross-sectional view of a coil block disposed on the bobbin shown in FIG. 1.

1 and 6, the coil block 500 is formed in a cylindrical shape inserted into the outer circumferential surface of the body 210 of the bobbin 200, and the coil block 500 is formed at the bottom of the outer circumferential surface of the body 210. It is disposed on the support part 220.

The coil block 500 is formed by winding an electric wire coated with an insulating resin such as enamel resin in a cylindrical shape, and the coil block 500 is wound in a direction parallel to the upper surface of the support part 220 of the bobbin 200 . Hereinafter, one end of the coil block 500 will be defined as a first end 510 and an end facing the first end 510 as a second end 520.

The coil block 500 is made of a plurality of layers, and the coil block 500 is made of, for example, 2N+1 (N>1, where N is a natural number) coil layer.

Specifically, the coil block 500 includes three or more odd-numbered layers. In an embodiment of the present invention, the diameter of the lens mounted on the bobbin 200 may be further improved by forming the coil block 500 with odd layers.

The coil block 500 includes a first coil layer 501, a second coil layer 503, and a third coil layer 505.

The first coil layer 501 on which the first end 510 is formed is formed from a portion where the support part 220 of the bobbin 200 and the outer circumferential surface of the body 210 meet, and the first coil layer 501 is a body ( It is formed in a shape wound along the outer peripheral surface of 210) to the top of the outer peripheral surface of the body 210.

The second coil layer 503 is disposed on the first coil layer 501 and is wound from the upper end of the outer peripheral surface of the bobbin 200 toward the support part 220.

The third coil layer 505 is disposed on the second coil layer 503, and the third coil layer 505 is wound from the support unit 220 to the top of the outer peripheral surface of the bobbin 200, and the third coil layer ( The second end 520 formed at 505 is inserted into the bobbin groove 230 formed in the body 210 of the bobbin 200 and then passes through the cutout 222.

The second end 520 formed in the third coil layer 505 inserted into the bobbin groove 230 and passed through the cutout portion 222 is a second end portion 520 bent parallel to the support portion 220 as shown in FIG. It includes a first bent portion 522 and a second bent portion 524 bent downward from the first bent portion 522.

The first bent portion 522 is guided by a guide protrusion 226 formed in the cutout portion 222 of the bobbin 200.

The first end 510 of the coil block 500 is electrically connected to the inner elastic part 410 of the second elastic member 400 by solder, and the second end 520 of the coil block 500 is 1 It is electrically connected to the inner elastic part 310 of the elastic member 300 by solder.

In one embodiment of the present invention, by coupling the second end 520 of the coil block 500 to the first elastic member 300 through the bobbin groove 230, the wire is released from the coil block 500. It can prevent defects.

The driving signal applied to the first elastic member 300 and the second elastic member 400 is applied to the first end 510 and the second end 520 of the coil block 500, and thus the coil block wound A magnetic field is generated by the current flowing through (500).

The stator 600 includes a magnet 610 and an integral housing 620.

The magnet 610 is disposed to face the coil block 500 wound on the bobbin 200, and the magnet 610 is formed in plural.

In one embodiment of the present invention, the magnet 610 includes a flat magnet formed in a plate shape, and four magnets 610 are disposed to face the coil block 500 so as to be perpendicular to each other.

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The integral housing 620 serves to fix the magnet 610 at a designated position.

The integrated housing 620 has a plurality of side surfaces 622 arranged parallel to the outer surface of the body 210 of the bobbin 200, and a magnet storage hole for accommodating the magnet 610 at each side 622 624 is formed.

On the other hand, the side surface 622 of the integrated housing 620 is formed with coupling grooves 626 that are coupled to the coupling pillars 120 formed at each corner of the upper surface 110 of the base 100.

The cover can 700 includes an upper plate 710 and a side plate 720.

The upper plate 710 includes an opening corresponding to the hollow of the bobbin 200, and the side plate 720 extends from each edge of the upper plate 710 in a direction surrounding the magnet 610 of the integrated housing 620 . In an embodiment of the present invention, the front and rear surfaces of the magnet 610 facing the coil block 500 are in contact with the inner side of the side plate 720 of the cover can 700.

In one embodiment of the present invention, the top plate 710 and the side plate 720 may be integrally formed. The side plate 720 of the upper plate 710 is fixed to the base 100.

As described in detail above, the size of the lens mounted on the bobbin can be further increased, the coil forming the coil block is prevented from unwinding, and the coil block is prevented from interfering with components around the coil block, thereby improving image quality and Driving performance can be further improved.

Although the embodiments according to the present invention have been described above, these are merely exemplary, and those of ordinary skill in the art will understand that various modifications and equivalent ranges of embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the following claims.

800...voice coil motor 100...base
200...bobbin 300,400...first and second elastic members
500...coil block 600...stator
700...cover can 750...third elastic member

Claims (19)

Base;
A bobbin disposed on the base;
A cover can disposed on the base and having the bobbin disposed therein;
A coil block disposed on the bobbin;
A magnet disposed in the cover can and facing the coil block; And
Including a lower elastic member connecting the bobbin and the base,
The bobbin includes a support part protruding from an outer circumferential surface and supporting a lower portion of the coil block, and a guide protrusion protruding from the outer circumferential surface and disposed at a position lower than an upper surface of the support part,
One end of the coil block includes a region bent along an upper surface and a side surface of the guide protrusion and extending downward,
The lower elastic member is a voice coil motor electrically connected to the coil block. The method of claim 1,
At least a portion of the lower elastic member is disposed under the support part,
One end of the coil block extends to a region corresponding to the lower surface of the support part,
The lower elastic member is a voice coil motor coupled to one end of the coil block by solder. The method of claim 1,
The coil block is a voice coil motor including a first end drawn upward and a second end drawn downward. The method of claim 3,
The bobbin includes a bobbin groove formed on an outer circumferential surface,
The bobbin groove is formed in a direction toward an upper end of an outer peripheral surface of the bobbin and a lower end facing the upper end. The method of claim 4,
The lower elastic member is a voice coil motor including first and second elastic members symmetrical with respect to the center of the bobbin. The method of claim 5,
The first end of the coil block is connected to the second elastic member through the bobbin groove,
The second end of the coil block is a voice coil motor connected to the first elastic member. The method of claim 6,
The bobbin includes a cutout from which a part of the support part is removed,
The first end and the second end of the voice coil motor is connected to the lower elastic member through the cutout. The method of claim 7,
The first end includes a first bent part bent in parallel with the support part after passing through the bobbin groove, and a second bent part bent downward from the first bent part,
The second bent portion and the voice coil motor are disposed parallel to each other. The method of claim 8,
The bobbin is a voice coil motor including an exposed portion adjacent to the cutout portion for increasing an exposed area of the first and second elastic members. The method of claim 8,
The voice coil motor of the second bent portion of the second end is guided by the guide protrusion. The method of claim 5,
Including a housing disposed in the cover can,
Each of the first and second elastic members includes an inner elastic portion coupled to the bobbin, an outer elastic portion coupled between the housing and the base, and a connection elastic portion connecting the inner elastic portion and the outer elastic portion. ,
The voice coil motor electrically connected to an external power source with the outer elastic part. The method of claim 11,
The first end of the coil block is soldered to an inner elastic portion of the second elastic member, and the second end is soldered to an inner elastic portion of the first elastic member. The method of claim 11,
A voice coil motor having a first through hole coupled to a first boss formed on a lower surface of the bobbin in an inner elastic portion of the first and second elastic members. The method of claim 11,
A voice coil motor having a second through-hole coupled to a second boss formed on an upper surface of the base, wherein the outer elastic portions of the first and second elastic members are formed. The method of claim 11,
It includes an upper elastic member connected to the bobbin and the housing,
The upper elastic member is spaced apart from the inner surface of the upper plate of the cover can and coupled to the upper surface of the bobbin; Voice coil motor comprising a connecting elastic portion. The method of claim 15,
The cover can is coupled to the base,
The bobbin includes curved portions protruding from the outer circumferential surface of the body and flat portions alternately formed between the curved portions,
The bobbin groove is a voice coil motor formed at a portion where the curved portion and the flat portion meet. The method of claim 1,
The coil block is formed by winding an insulating resin-coated wire in a cylindrical shape,
The coil block is wound in a direction parallel to the upper surface of the support part of the bobbin. The method of claim 11,
The housing includes a plurality of side surfaces disposed parallel to the outer surface of the bobbin,
A voice coil motor including a magnet receiving hole in which the magnet is accommodated in each of the plurality of side surfaces. The voice coil motor of claim 1;
A lens coupled to the bobbin; And
Camera module comprising an image sensor module for changing the light passing through the lens into an image.

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