KR102176696B1 - Voice coil motor - Google Patents

Abstract

The voice coil motor includes a base unit; A mover including a bobbin disposed above the base unit to support a lens and intermittently forming a plurality of rotation preventing portions along an outer circumferential surface, and a first driving unit disposed on an outer circumferential surface of the bobbin; A stator including a yoke fixed to the base unit and including an inner yoke portion extending between the rotation preventing portions and surrounding the mover and a second driving portion disposed to face the first driving portion; An elastic member elastically supporting the mover with respect to the stator; And a foreign material generation suppressing part preventing generation of foreign matter from the bobbin by reducing a contact area between the rotation preventing part and the inner yoke part.

Description

Voice coil motor {VOICE COIL MOTOR}

The present invention relates to a voice coil motor.

BACKGROUND ART In recent years, portable communication devices such as mobile phones, game consoles, and tablet PCs are equipped with a camera module including an image sensor capable of storing a digital image or video of a subject.

In the conventional camera module, it is difficult to adjust the distance between the image sensor and the lens disposed in front of the image sensor, so that it is difficult to accurately set the focus on the subject, so that the quality of digital images or moving pictures has deteriorated.

With the recent development of the voice coil motor (VCM) technology, it is possible to adjust the distance between the image sensor and the lens, so that more excellent digital images or moving pictures can be obtained.

In order to drive the voice coil motor, a stator including a magnet and a yoke, a mover including a coil block disposed inside the stator and disposed on the outer circumferential surface of a bobbin equipped with a lens to generate electromagnetic force by a driving current applied from the outside And a cover disposed on the stator and covering the mover.

Conventional voice coil motors include technology that prevents abnormal rotation of the bobbin by causing a part of the bobbin to be caught in the yoke, but when the bobbin contacts the yoke, foreign matter is generated from the bobbin and the foreign matter is placed under the bobbin. It is disposed on the back and has a problem that the display quality of an image or video is deteriorated.

(Patent Document 1) KR10-2012-0065492 A

The present invention provides a voice coil motor that reduces or suppresses the generation of foreign matter from the bobbin when the bobbin contacts a yoke to prevent deterioration in display quality of an image or video.

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 base unit; A mover including a bobbin disposed above the base unit to support a lens and intermittently forming a plurality of rotation preventing portions along an outer circumferential surface, and a first driving unit disposed on an outer circumferential surface of the bobbin; A stator including a yoke fixed to the base unit and including an inner yoke portion extending between the rotation preventing portions and surrounding the mover and a second driving portion disposed to face the first driving portion; An elastic member elastically supporting the mover with respect to the stator; And a foreign material generation suppressing part preventing generation of foreign matter from the bobbin by reducing a contact area between the rotation preventing part and the inner yoke part.

According to the voice coil motor according to the present invention, by reducing the contact area of the inner yoke portion of the yoke in contact with the rotation preventing portion of the bobbin and the rotation preventing portion of the bobbin, from the rotation preventing portion when the rotation preventing portion of the bobbin and the inner yoke portion contact. By reducing or suppressing the amount of foreign matter generated, it is possible to prevent deterioration of the quality of an image or video.

1 is a cross-sectional view of a voice coil motor according to an embodiment of the present invention.
2 is an enlarged view of a portion'A' of FIG. 1.
3 is a side view of the bobbin of FIG. 1.
4 is a perspective view of a bobbin according to another embodiment of FIG. 3.

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 a cross-sectional view of a voice coil motor according to an embodiment of the present invention. 2 is an enlarged view of a portion'A' of FIG. 1. 3 is a side view of the bobbin of FIG. 1.

Referring to FIGS. 1 to 3, the voice coil motor 600 includes a base unit 100, a mover 200, a stator 300, an elastic member 400, and a foreign substance generation suppressor 500.

The base unit 100 is formed in a rectangular parallelepiped plate shape, and a through hole 110 penetrating the upper surface of the base unit 100 and a lower surface opposite to the upper surface is formed in the central portion of the base unit 100.

Each of the four corners formed on the upper surface of the base unit 100 protrudes coupling pillars 120, and the coupling pillars 120 are coupled to a spacer 330, which will be described later.

The mover 200 includes a bobbin 210 and a first driving unit 220.

The bobbin 210 is formed in a cylindrical shape with open top and bottom surfaces, and a female screw portion 212 for mounting at least one lens having a cylindrical shape may be formed on an inner surface of the bobbin 210.

A plurality of rotation preventing parts 213 protrude along the outer circumferential surface 211 of the bobbin 210 on the outer circumferential surface 211 of the bobbin 210, and each rotation preventing part 213 is an outer circumferential surface 211 of the bobbin 210 In, for example, four are formed at equal intervals.

The rotation preventing part 213 is caught by an inner yoke portion 323 of a yoke 320 to be described later, and rotation of the bobbin 210 is prevented.

Although in one embodiment of the present invention, a plurality of rotation preventing portions 213 protruding at equal intervals from the outer peripheral surface 211 of the bobbin 210 are shown and described, differently, the rotation preventing portion formed on the bobbin 210 The 213 may be formed in a concave recess shape from the outer peripheral surface 211 of the bobbin 210.

The first driving part 220 is formed by winding a long wire insulated by an insulating resin in a cylindrical shape, and the first driving part 220 is adhered to the surface of the rotation preventing part 213 of the bobbin 210 by an adhesive. I can.

The stator 300 includes a second driving unit 310 and a yoke 320. In addition, the stator 300 may further include a spacer 330.

In one embodiment of the present invention, the second driving unit 310 is disposed outside the first driving unit 220, and the second driving unit 310 is disposed facing the first driving unit 220.

The second driving unit 310 includes, for example, four magnets having a columnar shape, and the four second driving units 310 are formed around the first driving unit 220 at equal intervals.

The yoke 320 is formed in a square plate shape and includes a yoke top plate 321 having a circular opening in the center and a yoke side plate 322 extending from four edges of the yoke top plate 321 to surround the mover 100 do.

Second driving units 310 are disposed at inner edges formed by a pair of adjacent yoke side plates 322 among the yoke side plates 322 of the yoke 320.

The yoke upper plate 321 is formed with an inner yoke portion 323 extending between the rotation preventing portions 213 of the bobbin 210 from the opening of the yoke upper plate 321.

The inner yoke part 323 is a rotation preventing part 213 when the bobbin 210 is rotated due to leakage of an electromagnetic field generated from the first driving part 220 and a rotational force generated when a lens, etc. is mounted on the bobbin 210 It is in contact with and serves to prevent rotation of the bobbin 210.

The elastic member 400 is disposed on the lower surface of the bobbin 210 of the mover 200. In one embodiment of the present invention, the elastic members 400 are made of, for example, a pair, and each elastic member 400 is electrically insulated from each other.

The elastic member 400 made of a pair includes an inner elastic portion 410, an outer elastic portion 420, and a connection elastic portion 430.

The outer elastic part 420 is formed in a bent band shape when viewed from the top, and the outer elastic part 420 is inserted into the adjacent pair of coupling pillars 120 of the base unit 100 to form a coupling pillar 120 ) Is combined.

The inner elastic portion 410 is disposed on the lower surface of the bobbin 210. Accordingly, the inner elastic portion 410 is formed in a curved band shape similar to the shape of the lower surface of the bobbin 210.

The connection elastic part 430 is formed in a zigzag shape when viewed from the top, and the connection elastic part 430 is connected to the inner elastic part 410 and the outer elastic part 420.

Referring again to FIG. 1, an additional elastic member 450 for elastically supporting the bobbin 210 is disposed on an upper surface opposite to the lower surface of the bobbin 210.

The spacer 330 serves to fix the elastic member 400, the additional elastic member 450, the mover 200 and the stator 300.

The spacer 330 includes an upper spacer 332 and a lower spacer 335, the upper spacer 332 and the lower spacer 335 are engaged with each other, and the lower spacer 335 is a combination of the base unit 100 It is coupled to the pillar 120.

The outer elastic portion 420 of the elastic member 400 is fixed between the lower spacer 335 and the upper surface of the base unit 100, and the additional elastic member 450 is fixed to the lower surface of the upper spacer 332.

The cover 550 includes a cover top plate 560 formed in a square plate shape having a circular opening for exposing the lens and a cover side plate 570 extending from the edge of the cover top plate 560, and the cover side plate 570 ) Is coupled to the base unit 100.

2 and 3, when a lens is coupled to the bobbin 210 or when the bobbin 210 is up-down, a rotational force is applied to the bobbin 210, and the bobbin 210 is applied by the rotational force applied to the bobbin 210. ) Is rotated in the horizontal direction. When the bobbin 210 is rotated, shape deformation or distortion of the elastic member 400 and the additional elastic member 450 occurs, so that the optical axis of the mover 100 is twisted or the mover ( 100) drive failure occurs.

The rotation of the bobbin 210 is prevented by the rotation preventing portion 213 formed on the outer circumferential surface of the bobbin 210 and the inner yoke portion 323 of the yoke 320, the inner yoke portion 323 and the rotation preventing portion When the 213 is in contact, fine foreign matter is generated from the bobbin 210, which is an ejected product, and the fine foreign matter may fall and flow into the upper surface of the IR filter disposed on the rear side of the base unit 100.

When a fine foreign material generated from the bobbin 210 is disposed on the IR filter, the quality of a digital image or video may be deteriorated by the foreign material.

In one embodiment of the present invention, the voice coil motor 600 generates foreign matter to prevent generation of foreign matter due to the contact between the rotation preventing portion 213 of the bobbin 210 and the inner yoke portion 323 of the yoke 320 It includes a suppressor 500.

The foreign matter generation suppressing unit 500 is, for example, a rotation preventing unit of the bobbin 210 by reducing the contact area between the rotation preventing unit 213 of the bobbin 210 and the inner yoke unit 323 of the yoke 320 Reduce or suppress the amount of foreign matter generated from (213).

The foreign matter generation suppressing part 500 is formed on each side 213a of the rotation preventing part 213 that faces both sides of the inner yoke part 323 and is in contact with the inner yoke part 323.

In particular, the foreign matter generation suppressing unit 500 formed on the side surfaces 213a facing both sides of the inner yoke unit 323 is from the rotation preventing unit 213 to reduce the amount of foreign substances generated from the rotation preventing unit 213. It is formed in a stepped shape extending outward.

Specifically, when both sides of the inner yoke part 323 are formed in a linear shape, a first gap is formed between the side surfaces of the rotation preventing part 213 and the side surfaces of the inner yoke part 323, and foreign matter is generated. A second gap larger than the first gap is formed between the side surfaces of the suppression part 500 and the inner yoke part 323.

Therefore, when the bobbin 210 is rotated, the side surfaces of the inner yoke unit 323 are in contact with the respective side surfaces 213a of the rotation preventing unit 213 whose area is reduced, thereby preventing foreign substances caused by the rotation preventing unit 213. The amount of occurrence can be reduced or suppressed.

In addition, considering that the bobbin 210 is injection-molded, the foreign matter generation suppressing unit 500 may be formed to a predetermined depth from the upper surface of the bobbin 210.

On the other hand, although injection molding is more difficult, in order to further reduce the contact area between the rotation preventing part 213 of the bobbin 210 and the inner yoke part 323, the foreign matter generation suppressing part 500 is at least in the rotation preventing part 213. It is okay if two are intermittently formed.

Referring to FIG. 4, even if the amount of foreign matter generated by the contact between the rotation preventing unit 213 and the inner yoke unit 323 due to the rotation of the bobbin 210 is reduced or suppressed, a small amount of foreign matter In one embodiment of the present invention, in an embodiment of the present invention, in order to prevent a trace amount of foreign matter generated through the rotation preventing unit 213 from flowing into the IR filter, etc., the bottom surface formed by the rotation preventing unit 213 A foreign material adsorption member 590 may be disposed.

The foreign material adsorption member 590 may include, for example, a synthetic resin having sufficient viscosity to collect foreign materials, and the foreign material adsorption member 590 may include an epoxy resin or the like having viscosity.

Although in one embodiment of the present invention, in order to prevent foreign matters generated from the rotation preventing part 213 of the bobbin 210, the foreign matter generation suppressing part 500 having a recess shape in the rotation preventing part 213 of the bobbin 210 It is shown and described that reducing or suppressing the occurrence of foreign matters from the rotation preventing unit 213 by forming, but differently, the foreign matter generation suppressing unit 500 is an inner yoke of the yoke 320 facing the rotation preventing unit 213 A part of the part 323 may be cut and cut to reduce the contact area with the rotation preventing part 213.

As described in detail above, by reducing the contact area of the inner yoke part of the yoke in contact with the rotation preventing part of the bobbin and the rotation preventing part of the bobbin, the rotation preventing part generated from the rotation preventing part when the bobbin rotation preventing part and the inner yoke part contact By reducing or suppressing the amount of foreign matter generated, it is possible to prevent deterioration of the quality of images or videos.

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.

600...Voice coil motor 100...base unit
200... mover 300... stator
400...elastic member 500...foreign substance generation suppressor

Claims (20)

Base unit;
A bobbin disposed on the base unit;
A coil disposed on the bobbin;
A yoke including a top plate, a side plate extending from the top plate, and an inner yoke portion extending from the top plate and disposed in the side plate;
A magnet disposed between the coil and the side plate of the yoke and facing the coil; And
It includes an upper elastic member coupled to the upper surface of the bobbin,
The bobbin includes a first outer peripheral surface and a plurality of rotation preventing portions protruding from the first outer peripheral surface,
The plurality of rotation preventing portions include a second outer peripheral surface disposed outside the first outer peripheral surface of the bobbin,
The coil is disposed on the second outer peripheral surface of the plurality of rotation preventing portions,
At least a portion of the inner yoke portion is disposed between the coil and the first outer peripheral surface of the bobbin and between the plurality of rotation preventing portions,
At least one of the plurality of rotation prevention parts includes a first portion forming at least one edge of the plurality of rotation prevention parts and spaced apart from the upper surface of the bobbin. The method of claim 1,
A voice coil motor having a foreign matter generation suppressing part formed between the first part of the rotation preventing part and the upper surface of the bobbin. The method of claim 1,
The first outer circumferential surface of the bobbin directly connects an upper surface of the first portion and the upper surface of the bobbin in an optical axis direction. The method of claim 1,
At least one of the plurality of rotation preventing portions includes a second portion directly connected to the upper surface of the bobbin,
The first portion is a voice coil motor disposed on both sides of the second portion. The method of claim 1,
A voice coil motor disposed between the plurality of rotation preventing parts so that at least a part of the inner yoke part is caught by the rotation preventing part to prevent rotation of the bobbin. The method of claim 1,
The coil is disposed on the second outer peripheral surface of the plurality of rotation preventing portions such that a space is formed between the coil and the first outer peripheral surface of the bobbin,
At least a portion of the inner yoke portion is disposed in the space between the coil and the first outer peripheral surface of the bobbin. The method of claim 1,
The upper elastic member includes an inner elastic part disposed on the upper surface of the bobbin, an outer elastic part disposed outside the inner elastic part, and a connection part connecting the inner elastic part and the outer elastic part,
The first portion of the rotation preventing part is a voice coil motor spaced apart from the upper elastic member. The method of claim 1,
A voice coil motor having a recess recessed from the upper surface of the bobbin to reduce a contact area between the rotation preventing part of the bobbin and the inner yoke part. The method of claim 8,
The inner yoke part is a voice coil motor that comes into contact with the rotation preventing part when the bobbin rotates. The method of claim 1,
A voice coil motor in which an upper surface of the first portion of the rotation preventing part is disposed at a height lower than that of the upper surface of the bobbin. The method of claim 1,
The inner yoke portion includes a side surface facing the side of the rotation preventing portion,
A step-shaped recess having a first depth from the upper surface of the bobbin and a second depth from the side surface of the rotation preventing part is formed,
A first gap is formed between the side surface of the rotation preventing part and the side surface of the inner yoke part, and a second gap is formed between the side surface of the recess and the side surface of the inner yoke part,
The second gap is a voice coil motor larger than the first gap. The method of claim 1,
Including a foreign material adsorption member disposed between the plurality of rotation preventing parts,
The foreign material adsorption member is a voice coil motor comprising a viscous epoxy resin. The method of claim 1,
The voice coil motor is integrally formed with the bobbin. The voice coil motor of claim 1;
A lens coupled to the bobbin of the voice coil motor; And
A camera module containing an image sensor. A mobile phone comprising the camera module of claim 14. Base unit;
A bobbin disposed on the base unit;
A coil disposed on the bobbin;
A yoke including an upper plate, a side plate extending from the upper plate, and a plurality of inner yoke portions extending from the upper plate and disposed in the side plate;
A magnet disposed between the coil and the side plate of the yoke and facing the coil; And
It includes an upper elastic member coupled to the upper surface of the bobbin,
The bobbin includes a first outer circumferential surface, and a rotation preventing portion protruding from the first outer circumferential surface,
The rotation preventing part includes a second outer circumferential surface disposed outside the first outer circumferential surface of the bobbin,
The coil is disposed on the second outer peripheral surface of the rotation preventing part,
At least a portion of the plurality of inner yoke portions is disposed between the coil and the first outer peripheral surface of the bobbin,
The rotation preventing portion is disposed between the plurality of inner yoke portions,
The rotation preventing portion forming an edge of the rotation preventing portion and a voice coil motor comprising a first portion spaced apart from the upper surface of the bobbin. The method of claim 16,
A voice coil motor having a foreign matter generation suppressing part formed between the first part of the rotation preventing part and the upper surface of the bobbin. The method of claim 16,
The first outer circumferential surface of the bobbin directly connects an upper surface of the first portion and the upper surface of the bobbin in an optical axis direction. The method of claim 16,
The rotation preventing part of the bobbin is formed of a plurality of rotation preventing parts,
A voice coil motor disposed between the plurality of rotation preventing portions and the plurality of inner yoke portions. The method of claim 16,
A voice coil motor in which an upper surface of the first portion of the rotation preventing part is disposed at a height lower than that of the upper surface of the bobbin.

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