KR102311818B1 - Voice coil motor - Google Patents

Abstract

The voice coil motor includes: a mover including a bobbin to which a lens is mounted and a coil block disposed on an outer circumferential surface of the bobbin; a stator including a flat magnet disposed around the coil block and a lower spacer for fixing the flat magnet; an elastic member elastically supported on the bobbin; and a base to which the mover, the lower spacer, and the elastic member are fixed.

Description

Voice coil motor {VOICE COIL MOTOR}

The present invention relates to a voice coil motor.

Recently, 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 for changing external light into an image, and a lens for focusing external light on the image sensor module.

In the conventional camera module, it is difficult to obtain a desired image because the distance between the lens and the image sensor module cannot be adjusted. However, a voice coil motor capable of adjusting the distance between the lens and the image sensor module of the camera module has recently been developed.

The conventional voice coil motor includes an image sensor mounted on the rear surface of a base having an opening, a bobbin disposed on the base and mounted with a lens, a coil block wound on the bobbin and a magnet facing the coil block, a yoke and a bobbin for fixing the magnet. It includes an elastic member for elastically supporting it, and adjusts the distance between the lens and the image sensor module mounted on the bobbin by using the attractive and repulsive force generated by the action of the magnetic field generated from the magnet fixed to the coil block and the yoke.

However, since the conventional voice coil motor requires a yoke to fix the magnet facing the bobbin, there is a problem in that the number of parts and assembly steps due to the yoke are increased.

In addition, there is a problem in that it is difficult to increase the aperture of the lens mounted on the bobbin due to the area occupied by the yoke and the magnet.

The present invention provides a voice coil motor suitable for reducing the number of parts and assembly steps due to the yoke by not using the yoke for fixing the magnet, and increasing the diameter of the lens mounted on the bobbin by not using the yoke. .

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

In one embodiment, the voice coil motor includes a mover including a bobbin to which a lens is mounted and a coil block disposed on an outer circumferential surface of the bobbin; a stator including a flat magnet disposed around the coil block and a lower spacer for fixing the flat magnet; an elastic member elastically supported on the bobbin; and a base to which the mover, the lower spacer, and the elastic member are fixed.

According to the voice coil motor according to the present invention, a frame portion and a pillar portion protruding from the frame portion are formed in the lower spacer, a magnet is disposed in the frame portion, and a guide portion protrudes from the pillar portions to fix the magnet, thereby fixing the conventional magnet. By not using the yoke, the number of parts and the number of assembly steps is reduced, and by not using the yoke, it is possible to increase the aperture of the bobbin and the lens mounted on the bobbin.

1 is an exploded perspective view of a voice coil motor according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view illustrating the flat magnet and the lower spacer of FIG. 1 .
3 is a combined perspective view of the flat magnet and the lower spacer of FIG. 2 .
4 is a front view of the flat magnet coupled to the lower spacer of FIG. 3 .

Hereinafter, an embodiment according to 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 explanation. In addition, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be interpreted as meanings and concepts consistent with the technical spirit of the present invention based on the contents throughout this specification.

1 is an exploded perspective view of a voice coil motor according to an embodiment of the present invention. FIG. 2 is an exploded perspective view illustrating the flat magnet and the lower spacer of FIG. 1 . 3 is a combined perspective view of the flat magnet and the lower spacer of FIG. 2 . 4 is a front view of the flat magnet coupled to the lower spacer of FIG. 3 .

1 to 4 , the voice coil motor 800 includes a mover 100 , a stator 200 , an elastic member 300 , and a base 400 . In addition, the voice coil motor 800 may further include an upper spacer 500 and a cover can 600 .

The mover 100 includes a bobbin 110 and a coil block 120 .

The mover 100 includes a lens, and the mover 100 separates the built-in lens from the image sensor fixed to the base 400 to change the distance between the lens and the image sensor.

The bobbin 110 is formed in a hollow cylindrical shape, and a lens is fixed to the inner circumferential surface of the bobbin 110 . In order to fix the lens to the inner circumferential surface of the bobbin 110 , a thread may be formed on the inner circumferential surface of the bobbin 110 .

On the outer peripheral surface of the bobbin 110 , for example, four flat parts 112 are formed, and the four flat parts 112 are spaced apart from each other at the same distance.

On the other hand, a support part 114 for supporting a coil block 120 to be described later is formed at the lower end of the outer peripheral surface of the bobbin 110 , and the support part 114 is formed in a shape protruding from the lower end of the outer peripheral surface.

The coil block 120 is formed by winding a long wire coated with an insulating resin such as enamel resin. The coil block 120 is formed in a cylindrical shape disposed on the outer circumferential surface of the bobbin 110 , and the coil block 120 is formed, for example, in a rectangular cylindrical shape with upper and lower surfaces open.

When a current is applied to the coil block 120 in which the coated long wire is wound in a tubular shape, a magnetic field is generated from the coil block 120 .

The coil block 120 inserted into the outer circumferential surface of the bobbin 110 has four flat surfaces 122 identical to the four flat portions 112 of the bobbin 110 and four curved surfaces connecting the flat surfaces 122 . (124).

2 and 3 , the stator 200 includes a flat magnet 210 and a lower spacer 250 .

The flat magnet 210 may be formed, for example, in a rectangular plate shape. Among the flat magnets 210 having a rectangular shape, the front surface 212 facing the coil block 120 is disposed to face each of the flat surfaces 122 of the coil block 120 , and thus the number of flat magnets 210 . is formed equal to the number of flat surfaces 122 of the coil block 120 .

In one embodiment of the present invention, the four flat magnets 210 are disposed to face each of the four flat surfaces 122 of the coil block 120 , and the four flat magnets 210 are disposed perpendicular to each other.

Each flat magnet 210 may be a 2-pole flat magnet or a 4-pole flat magnet.

The lower spacer 250 serves to fix the flat magnets 210 as well as fix the lower elastic member 310 of the elastic member 300 to be described later.

In order for the lower spacer 250 to fix the lower elastic member 310 and each flat magnet 210 , the lower spacer 250 includes a frame part 260 , a pillar part 270 , and a fixing part 280 . .

The frame part 260 supports each lower surface of the four flat magnets 210 , and in order to support the lower surface 211 of the four flat magnets 210 , the frame part 260 has an opening when viewed in a plan view. It is formed in a rectangular frame shape with

The pillar part 270 protrudes from the upper surface of the frame part 260 to face both side surfaces 213 of each of the flat magnets 210 .

In one embodiment of the present invention, each pillar portion 270 protrudes from the upper surface of the frame portion 260 corresponding to between a pair of adjacent flat magnets 210 . The pillar parts 270 protrude from each corner of the upper surface of the frame part 260 .

An inclined guide part 275 is formed in each pillar part 270 facing both side surfaces 213 of each flat magnet 210 so that the flat magnet 210 is smoothly inserted.

In a state in which the flat magnet 210 is supported on the upper surface of the frame portion 260, the lower end 276 of the guide portion 275 and the edge formed by the side 213 and lower surface 211 of the flat magnet 210 ( 214) meet each other. When the end of the guide part 275 and the edge 214 of the flat magnet 210 meet each other, the flat magnet 210 is fixed at a designated position of the lower spacer 250 .

On the other hand, when the guide part 275 is formed to be inclined, when the flat magnet 210 is disposed on the upper surface of the frame part 260, the flat magnet 210 is easily formed as a pair of pillar parts ( It is disposed on the frame portion 260 along the guide portions 275 formed in each of the 270 . Conversely, when the inclined guide portion 275 is not formed on the pillar portion 270 formed on the frame portion 260 , a flat magnet 210 having a very small size is attached to the pillar portion 270 having a very small size. It is very difficult to insert accurately, so it takes a lot of time for assembling, and assembly defects frequently occur.

The fixing part 280 extends from the inner surface of each pillar part 270 formed in the frame part 260 in a direction toward the front surface of each flat magnet 210 , and each flat magnet 210 has the fixing part 280 . ) is supported by

The elastic member 300 includes a lower elastic member 310 and an upper elastic member 350 .

Two lower elastic members 310 are formed as a pair. Hereinafter, two lower elastic members 310 formed as a pair are defined as a first lower elastic member 314 and a second lower elastic member 319 . do it with

The first and second lower elastic members 314 and 319 are outer elastic parts 311 and 315 formed in a shape corresponding to the frame part 260 of the lower spacer 250 , and inner elastic parts 312 and 317 fixed to the lower surface of the bobbin 110 . ) and connecting elastic parts 313 and 318 for connecting the outer elastic parts 311 and 315 and the inner elastic parts 312 and 317. The connecting elastic parts 313 and 318 elastically support the bobbin 110 .

In an embodiment of the present invention, the outer elastic parts 311 and 315, the inner elastic parts 312 and 317 and the connecting elastic parts 313 and 318 of the first and second lower elastic members 314 and 319 are integrally formed.

On the other hand, terminal portions 311a and 315a are formed on the outer elastic portions 311 and 315 of the first and second lower elastic members 314 and 319, respectively, and the terminal portions 311a and 315a are respectively directed downward from the outer elastic portions 311 and 315. is bent

The upper elastic member 350 is coupled to the upper surface of the bobbin 110 to elastically support the bobbin 110 .

The upper elastic member 350 connects the outer elastic part 352 formed in the shape of a square frame, the inner elastic part 354 coupled to the upper surface of the bobbin 110 , and the outer elastic part 352 and the inner elastic part 354 . It includes a connection elastic part 356 that is.

Four corners of the outer elastic part 352 of the upper elastic member 350 are disposed on the upper surface of each pillar part 270 of the lower spacer 250 .

The base 400 fixes the mover 100 , the stator 200 , and the lower elastic member 310 of the elastic member 300 .

The base 400 is formed in a rectangular plate shape, and an opening 410 corresponding to the hollow of the bobbin 110 is formed in the base 400 .

A protrusion 403 in contact with the outer elastic parts 311 and 315 of the lower elastic member 310 is formed on the edge of the upper surface 401 of the base 400 , and the lower spacer is formed on the edge of the upper surface 401 of the base 400 . A coupling groove 404 coupled to the coupling protrusion protruding from the lower surface of the frame portion 260 of the 250 is formed.

The lower elastic member 310 is interposed between the frame portion 260 of the lower spacer 250 and the protrusion 403 of the base 400 , and is disposed on the frame portion 260 of the base 400 and the lower spacer 250 . Thus, the lower elastic member 310 is fixed.

The upper spacer 500 is disposed on the upper elastic member 350 .

The upper spacer 500 is formed in a shape and size corresponding to the frame portion 260 of the lower spacer 250 , and a position corresponding to the pillar portion 270 of the lower spacer 250 in the upper spacer 500 . A coupling protrusion 510 is formed in the upper spacer 500 , and the coupling protrusion 510 formed on the upper spacer 500 is coupled to the coupling hole 275a formed on the upper surface of the column 270 of the lower spacer 250 .

The upper elastic member 350 includes the lower spacer 250 and the upper spacer ( 500) are combined between them.

The cover can 600 includes an upper plate 610 and a side plate 620 .

The upper plate 610 is formed to have a planar area substantially equal to that of the base 400 , and an opening exposing the bobbin 110 is formed in the central portion of the upper plate 610 .

The side plate 620 extends in a direction from the edge of the upper plate 610 toward the base 400 , and the side plate 620 is coupled to the base 400 .

The inner surface of the side plate 620 is in contact with the rear surface of the flat magnet 210 fixed to the lower spacer 250 , and the side plate 620 serves as a yoke.

As described above in detail, the yoke for fixing the conventional magnet by forming the frame part and the pillar part protruding from the frame part in the lower spacer, placing the magnet in the frame part, and fixing the magnet by protruding the guide part from the pillar parts. By not using it, the number of parts and assembly steps is reduced, and by not using the yoke, the bobbin and the aperture of the lens mounted on the bobbin can be increased.

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. Accordingly, the true technical protection scope of the present invention should be defined by the following claims.

800...Voice Coil Motor 100...Motor
200...stator 300...elastic member
400...base 500...upper spacer
600...cover cans

Claims (20)

a cover including an upper plate and a side plate extending from the upper plate;
a bobbin disposed within the cover;
a spacer disposed between the cover and the bobbin;
a coil disposed on the bobbin;
a magnet disposed on the spacer and facing the coil;
a base disposed under the spacer and coupled to the side plate of the cover; and
An upper elastic member coupled to the upper portion of the bobbin,
The magnet includes a first surface facing the coil, a second surface disposed opposite to the first surface, and a side connecting the first surface and the second surface,
The spacer includes an upper spacer disposed between the magnet and the upper plate of the cover, a plurality of pillar portions extending downwardly from the upper spacer, and a plurality of pillar portions extending from the pillar portion toward the first surface of the magnet. including government;
The magnet is disposed between the plurality of pillars,
The fixing part of the spacer is disposed to face a part of the first surface of the magnet,
The pillar portion of the spacer is disposed to face at least a portion of the side surface of the magnet,
wherein the upper elastic member is disposed between the upper spacer and the magnet. According to claim 1,
The magnet includes both sides facing the pillar,
Each of the both side surfaces of the magnet includes a first portion in contact with the pillar portion and a second portion not in contact with the pillar portion. According to claim 1,
A portion of the first surface of the magnet is in contact with the fixing part of the spacer in a direction in which the first surface is facing, and the second surface of the magnet is in contact with an inner surface of the side plate of the cover. motor. According to claim 1,
It includes a lower elastic member coupled to the lower portion of the bobbin,
wherein the base includes a protrusion formed on an edge of an upper surface of the base and in contact with a portion of the lower elastic member. a cover including an upper plate and a side plate extending from the upper plate;
a bobbin disposed within the cover;
a spacer disposed between the cover and the bobbin;
a coil disposed on the bobbin;
a magnet disposed on the spacer and facing the coil;
a base disposed under the spacer and coupled to the side plate of the cover; and
An elastic member coupled to the bobbin,
The magnet includes a first surface facing the coil, a second surface disposed opposite to the first surface, and a side connecting the first surface and the second surface,
The spacer includes an upper spacer disposed between the magnet and the upper plate of the cover, a plurality of pillar portions extending downwardly from the upper spacer, and a plurality of pillar portions extending from the pillar portion toward the first surface of the magnet. including government;
The magnet is disposed between the plurality of pillars,
The fixing part of the spacer includes a first area facing a part of the first surface of the magnet,
The pillar portion of the spacer includes a second region facing at least a portion of the side surface of the magnet,
The second region of the pillar portion of the spacer has an inclined surface. According to claim 1,
The first surface of the magnet is supported by the fixing part of the spacer. According to claim 1,
When the magnet moves inward from the spacer, the voice coil motor is disposed to be caught by the fixing part. According to claim 1,
Each of the plurality of pillars extends from the upper spacer along the inner surface of the side plate of the cover,
The fixing part is formed by two on each of the plurality of pillar parts,
The fixing part is a voice coil motor supporting both edges of the first surface of the magnet. According to claim 1,
A distance between the fixing portions supporting both edges of the first surface of the magnet is shorter than a length of the first surface of the magnet in a corresponding direction. According to claim 1,
The upper elastic member includes an inner elastic part coupled to an upper portion of the bobbin, an outer elastic part at least partially disposed between the magnet and the upper spacer, and a connection elastic part connecting the inner elastic part and the outer elastic part voice coil motor. According to claim 1,
The side plate of the cover includes a first side plate, a second side plate disposed opposite to the first side plate, and a second side plate disposed between the first side plate and the second side plate and disposed opposite to each other a third side plate and a fourth side plate;
The plurality of pillar portions includes a first pillar portion disposed between the first side plate and the third side plate, a second pillar portion disposed between the first side plate and the fourth side plate, and the second A voice coil motor comprising: a third post part disposed between a side plate and the third side plate; and a fourth post part disposed between the second side plate and the fourth side plate. 12. The method of claim 11,
The magnet includes a first magnet disposed between the first side plate and the coil, and a second magnet disposed between the second side plate and the coil. 13. The method of claim 12,
The first magnet is disposed between the first pillar and the second pillar, and the second magnet is disposed between the third pillar and the fourth pillar. 13. The method of claim 12,
Each of the first magnet and the second magnet is a four-pole flat magnet of a voice coil motor. According to claim 1,
It includes a lower elastic member coupled to the lower portion of the bobbin,
The lower elastic member includes first and second lower elastic members spaced apart from each other,
Each of the first and second lower elastic members includes a terminal portion extending downward. According to claim 1,
The upper elastic member is a voice coil motor spaced apart from the upper plate of the cover. 11. The method of claim 10,
The outer elastic portion of the upper elastic member is a voice coil motor formed in a rectangular frame shape. The voice coil motor of claim 1;
a lens coupled to the bobbin of the voice coil motor; and
and an image sensor disposed under the base at a position corresponding to the bobbin. A portable communication device comprising the camera module of claim 18 .


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