KR20150064471A - Actuator for actuating lens - Google Patents

Abstract

Provided is an actuator comprising: a cover can forming appearance; a base bound below the cover can; an operator including a bobbin formed above the base and fixing a lens, and a coil unit formed on an outside surface of the bobbin; and a stator including a magnet unit formed to be opposed outside the coil unit, and a housing fixing the magnet unit, wherein the housing includes a magnet unit binding hole formed in a shape corresponding to the magnet unit on the side, and a first bonding hole formed on a lower surface of the magnet unit binding hole and where an adhesive is supplied to fix the magnet unit on the magnet unit binding hole.

Description

TECHNICAL FIELD [0001] The present invention relates to a lens driving actuator,

An embodiment of the present invention relates to an actuator having an improved structure and a camera module and a mobile phone provided with the actuator.

As the spread of various portable terminals is widely popularized and the wireless Internet service is commercialized, the demands of consumers related to portable terminals are diversified. Accordingly, various kinds of additional devices are installed in portable terminals.

Among them, an actuator is a representative example in which a subject is photographed as a photograph or a moving picture, and the image data is stored and edited and transmitted as necessary.

2. Description of the Related Art In recent years, there has been an increasing demand for a small-sized actuator for various multimedia fields such as a notebook type personal computer, a camera phone, a PDA, a smart, a toy, and an image input device such as a surveillance camera or an information terminal of a video tape recorder.

In particular, mobile phone cameras are becoming more compact and compact due to the rapid change of the smartphone market. In order to reduce the price, shortening the assembly process and shortening the number of personnel are needed.

The assembly process of the conventional actuator is largely divided into an upper assembly process for fastening the magnet-bonded housing to the cover can, a lower assembly process for fastening the bobbin having the coil wound thereon to the base, do.

That is, at the time of assembling the actuator, at least three processes such as a bonding process of the magnet and the housing, a bonding process of the housing and the cover can, and a bonding process of the cover can and the base are required. Here, the bonding process is performed using an adhesive such as epoxy.

Such a complicated assembling process has the following problems.

First, there may be a problem that the adhesive force is reduced when the adhesive applied to the upper assembly for a long time is left to bond the upper assembly and the lower assembly. This decrease in adhesive strength may result in a decrease in the performance of the actuator, and may result in an increase in defective performance such as hysteresis due to separation of the resin contained in the adhesive.

Second, since the adhesive application work must be performed at least two or three times, the processing cost for adding bonding equipment and operator is increased.

Third, automation of the assembly process becomes more difficult as the number of bonding operations increases.

The embodiment is to provide an improved actuator in comparison with the prior art in terms of tolerance reduction of the assembling process, automatic implementation, and process cost.

An embodiment of the present invention relates to a cover can which forms an outer appearance, a base which is fastened to the lower side of the cover can, a bobbin which is provided on the upper side of the base and fixes the lens part, And a stator having a magnet portion provided on the outer side of the coil portion and a housing for fixing the magnet portion, wherein the housing has a magnet coupling hole formed on a side surface thereof to correspond to the magnet portion, And at least two first bonding holes formed on a lower side surface of the magnet coupling hole for introducing an adhesive for fixing the magnet to the magnet coupling hole.

The first bonding hole may be opened toward the outside of the housing and closed by the inner circumferential surface of the cover can.

In addition, the housing may be formed in a hexahedron shape in which upper and lower sides are opened, and the magnet portion may be provided on four sides of the housing

In addition, the housing may further include a second bonding hole formed between the first bonding holes and through which an adhesive for fixing the cover can and the base is introduced.

The second bonding hole may be open toward the outside of the housing, and may be closed by the inner circumferential surface of the cover can.

The housing may be formed in a hexahedron shape having upper and lower sides opened, and the second bonding hole may be formed at an edge of the housing, respectively.

Further, the cover can is made of a metal material.

In addition, a lower end portion of the cover can is formed with at least one fastening piece formed on each surface thereof, and a fastening groove into which the fastening piece is inserted may be formed in the base.

Further, the stator may include a yoke portion for fixing the magnet portion.

Further, the yoke portion may be embodied as the cover can.

An inner yoke is formed on the upper surface of the cover can to expose a lens of the moving unit. The opening is formed with an inner yoke bent to the inside of the cover can. The inner yoke is connected to the bobbin A groove portion formed in the outer circumferential surface may be formed so as to be positioned between the coiled coil portions.

Meanwhile, the embodiment of the present invention can be realized by a camera module including the actuator or a mobile phone.

According to the embodiment of the present invention, an actuator is improved in which the structure of the housing is improved to shorten the assembling tolerance, improve the productivity, reduce the labor cost due to the automated implementation, and improve the reliability due to the improvement of the adhesion.

1 is an exploded perspective view of an actuator according to an embodiment of the present invention;
2 is an exploded perspective view of an actuator according to an embodiment of the present invention;
3 is a perspective view of a housing according to an embodiment of the present invention.
4 is a rear view of a housing according to an embodiment of the present invention.
5 is a rear view of the housing, the cover can, and the lower spring according to the embodiment of the present invention;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, all terms used herein are the same as the general meaning of the terms understood by those of ordinary skill in the art, and where the terms used herein contradict the general meaning of the term, they shall be as defined herein .

It is to be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Hereinafter, the actuator of the embodiment will be described in detail with reference to the drawings.

FIG. 1 is an exploded perspective view of an actuator according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of an actuator according to an embodiment of the present invention, FIG. 3 is a perspective view of a housing 320 according to an embodiment of the present invention, FIG. 4 is a rear view of the housing 320 according to the embodiment of the present invention, and FIG. 5 is a backside view of the housing 320, the cover can 100, and the lower spring 151 according to the embodiment of the present invention .

Referring to FIGS. 1 and 2, an actuator according to an embodiment may largely include a mover 200, a stator 300, a base 400, and an elastic unit 500.

The actuator according to the embodiment may further include a cover can 100. The cover can 100 accommodates the mover 200, the stator 300, and the elastic unit 500, . The inner surface of the cover can 100 is closely attached to the side surface of the base 400 to be described later and is mounted on the base 400 to protect the internal components from external impacts, .

In the embodiment, the cover can 100 may be fastened to the base 400, and the lower end of the cover can 100 may have at least one fastening piece 110 formed on each side thereof, A fastening groove 410 into which the fastening piece 110 is inserted may be formed in the fastening part 400 to provide a more rigid sealing function and a fastening function.

In addition, the cover can 100 should also function to protect the components of the actuator from external radio interference generated by a cellular phone or the like. Therefore, the cover can 100 is preferably formed of a metal material. The cover can 100 can be realized by the yoke itself, or it can be fixed by molding the yoke inside. The upper surface of the cover can 100 is formed with an opening 120 through which the lens of the lens unit 10 accommodated in the mover 200 is exposed, The inner yoke 130 may be formed by bending the inner yoke 130 inward. The inner yoke 130 may be positioned in the groove 215 formed in the bobbin 210, which will be described later. The inner yoke 130 is positioned in the groove 215 of the bobbin 210 to prevent rotation of the bobbin 210 in the optical axis direction and to concentrate the magnetic flux.

The mover 200 includes a bobbin 210 which is provided on the base 400 and fixes the lens unit 10 and a coil part 220 provided on the outer surface of the bobbin 210 do.

The mover 200 fixes the lens unit 10 therein and adjusts the focus of the image by moving the mover 200 including the lens unit 10.

Here, the adjustment of the focus of the image means AF (Auto Focusing) function for moving the lens unit 10 in the direction of the z-axis, which is the optical axis direction, for close-range or far-field focusing of the subject, Means an optical image stabilization (OIS) function that moves the lens unit 10 in the x- and y-axis directions that are perpendicular to the axial direction, or a function capable of simultaneously performing the AF function and the OIS function .

That is, the actuator unit 100 may be implemented as an A.F (Auto Focusing) type, an OIS (Optical Image Stabilization) type, or an A.F type and an OIS type simultaneously.

The lens unit 10 may be a lens barrel including at least one lens, but not limited thereto, and may include any holder structure capable of supporting the lens. In the embodiment, a case where the lens unit 10 is a lens barrel will be described as an example. The lens unit 10 is disposed on the upper side of the base 400 to be described later, and is disposed at a position corresponding to an image sensor to be described later. The lens unit 10 is provided with one or more lenses (not shown). The lens unit 10 may be threadedly coupled to the inner circumferential surface of the bobbin 210 to be described later, or may be screwlessly coupled using an adhesive 600 or the like.

Specifically, the bobbin 210 may have a first winding guide portion 211 and a second winding winding guide portion 212 for guiding windings of the coil portion 220, which will be described later, have. The first winding guide portion 211 and the second winding wire guide portion 212 may be integrally formed with the outer surface of the bobbin 210 and may be formed continuously or along the outer surface of the bobbin 210, Spaced apart from each other. Further, either one of the first winding guide portion 211 or the second winding guide portion 212 may be formed, or a coil portion wound beforehand without a separate winding guide portion may be fixed to the bobbin.

The upper surface of the bobbin 210 is protruded at a predetermined interval to be able to contact the upper surface of the cover can 100 during an external impact, thereby absorbing the impact and guiding the upper spring 510 A stopper 213 may be formed, which may be formed of at least two or more. The stopper 213 may be formed integrally with the bobbin 210. Further, the stopper 213 may be formed on the upper side of the first winding guide portion 211.

The lower side of the bobbin 210 may be formed with a lower coupling protrusion 214 to be coupled with a lower spring 520 to support the bobbin 210 from above the base 400 have.

The inner yoke 130 of the cover can 100 to be described later is provided with a groove 215 formed on the outer circumferential surface so as to be positioned between the bobbin 210 and the coil part 220 wound on the bobbin 210 ).

The coil part 220 may be wound on the outer surface of the bobbin 210 by being guided by the first winding guide part 211 and the second winding guide part 212 but four individual coils may be wound on the bobbin 210 at an angle of 90 [deg.]. Further, the coil portion wound beforehand may be fixed to the outer surface of the bobbin. When viewed in plan, the shape of the coil part can be circular, square, square including a circle, and in the case of a rectangular shape, it is possible to have a rectangular shape, a hexagonal shape, an octagonal shape, or the like. The coil part 220 receives an electric power applied from a printed circuit board to be described later to form an electromagnetic field.

The stator 300 may include a magnet unit 310 provided opposite to the outer side of the coil unit 220 and a housing 320 for fixing the magnet unit 310.

As shown in the figure, in the case of an AF (Auto Focusing) type electronic actuator, the actuator unit includes a magnet unit 310 provided on a side surface of a housing 320 to be described later and a magnet unit 310 provided on an outer circumferential surface of the bobbin 210, And a coil part 220 provided at a position corresponding to the inner surface of the coil part 310. In addition, the yoke portion may include a yoke portion for fixing the magnet portion 310. In an embodiment, the yoke portion may be a cover can.

Here, the yoke portion may be embodied as a cover can 100, or may be embodied as an additional component.

An OIS coil part (not shown) provided in the base 400 to be described later is positioned so as to correspond to the lower side of the magnet part 310 although not shown in the case of an OIS (Optical Image Stabilization) And a substrate provided on the base 400 to receive power from the OIS coil portion. The substrate may be an FPCB (not shown). The base 400 or the substrate may further include a Hall sensor unit (not shown) provided at a position corresponding to the magnet unit 310. Of course, the Hall sensor unit may be electrically connected to the substrate, and may be connected to an external power source or an OIS control unit of the camera module to transmit a signal to the OIS drive.

The coil part 220 is fixed to the bobbin so that the bobbin moves up and down to move the lens part 10 in the optical axis direction. The OIS coil part moves the lens part 10 in a direction perpendicular to the optical axis direction .

Here, the coil part 220 can receive power from a printed circuit board, and the OIS coil part can be disposed on a substrate provided on an unillustrated base 400 to receive power from the substrate. On the other hand, in consideration of the downsizing of the actuator, specifically, the height in the z-axis direction which is the optical axis direction, the OIS coil portion may be formed of a patterned coil.

In the latter case, the Hall sensor unit included in the case of the OIS (Optical Image Stabilization) type is provided for sensing the intensity of the magnetic field depending on the position of the magnet to sense the movement of the magnet unit 310 and precisely controlling the actuator .

In addition, the Hall sensor unit is disposed on the z axis in alignment with the magnet unit 310, and detects the displacement of the x axis and the y axis. The Hall sensor part is provided adjacent to the OIS coil part than the magnet part 310. However, considering that the intensity of the magnetic field formed in the magnet is several hundred times larger than the intensity of the electromagnetic field formed in the coil, The influence of the OIS coil part on sensing is not considered. Further, in the case of the OIS type, a separate second substrate is disposed on the upper surface of the housing so that the position of the housing 320 is supported relative to the first substrate on which the Hall sensor is disposed, The substrate may be connected by an elastic member such as a separate wire member or a leaf spring, and the elastic member may be formed of an electrically conductive material for transmitting electric signals to the AF coil or the OIS coil.

In addition, the actuator according to the embodiment of the present invention may further include the elastic unit 500.

The elastic unit 500 includes an upper spring 510 and a lower spring 520.

The upper spring 510 and the lower spring 520 may be formed of a plurality of springs disposed at respective corner portions of the housing 320. However, for efficiency of production, And a leaf spring.

Accordingly, the upper spring 510 and the lower spring 520 may be substantially ring-shaped, and the inner periphery may be formed in a circular shape corresponding to the shape of the moving part 300, And the inner and outer main shapes may be variously changed without being limited thereto.

The upper spring 510 is coupled to the upper surface of the housing 320 and the upper surface of the bobbin 210 to support the bobbin 210. The upper spring 510 supports the housing 320 As shown in Fig. The upper spring 510 is disposed at an upper end of the housing 320 and protrudes in a predetermined direction in an inner circumferential direction from an opening formed at an upper end of the housing 320. The protruded portion supports the upper end side of the moving unit 300 .

At least one upper coupling hole 511 or an upper coupling groove is formed in the upper spring 510 and an upper coupling hole 511 or an upper coupling groove is formed in the upper side of the housing 320, The protrusion 321 may be formed.

On the other hand, the edge of the lower spring 520 is disposed or supported on the upper surface of the base 400, and the inner peripheral side supports the lower end side of the moving part 300. The lower spring 520 may be provided with a lower coupling hole 521 or a lower coupling groove for supporting the lower side of the bobbin 210. At this time, a coupling hole or a coupling groove Can be formed. The lower spring 520 may have a terminal portion 522 bent in the direction of the base 400. The terminal portion 522 may be formed in a terminal hole 420 or a side surface Or may be electrically connected to the printed circuit board, not shown, through soldering or the like through exposure and coupling through the groove. The power source applied to the terminal portion 522 is connected to both ends of the coil wound on the bobbin 210 to transmit an electric signal.

Referring to FIGS. 3 and 4, the housing 320 is formed of an insulating material, and is preferably formed as an injection molding material in consideration of productivity.

Specifically, the housing 320 may be formed in a shape corresponding to the inner surface of the cover can 100 forming the outer surface of the actuator. In an embodiment, the housing 320 may be formed in a hexahedron shape corresponding to the shape of the cover can 100, and the upper and lower sides thereof may be opened to cover the lens unit 10 and the mover 200.

The housing 320 may include a magnet coupling hole 322 or a magnet coupling groove formed on a side surface of the magnet 320 so as to correspond to the magnet 310. That is, in the illustrated magnet unit 310, four magnets are formed in a rectangular shape, and the magnet coupling hole 322 or the magnet coupling groove may be formed in a rectangular shape corresponding to the four magnets have.

The housing 320 is formed on the lower side of the magnet coupling hole 322 and is provided with an adhesive agent 600 for fixing the magnet unit 310 to the magnet coupling hole 322, The first bonding hole 323 may be formed. In the embodiment, since the magnet portion 310 is composed of four magnets, the first bonding hole 323 is formed on the lower side of the magnet portion fastening hole 322. The first bonding hole 323 is formed from the lower side of the housing 320 to the magnet coupling hole 322.

5, the first bonding hole 323 may further securely fix the magnet unit 310 inserted into the magnet unit fastening hole 322 and may use an appropriate amount of the adhesive 600 So that it has an excellent effect in terms of reliability that occurs when the amount of the adhesive 600 is excessively or less than the conventional amount. The first bonding hole 323 may be formed as a hole penetrating from the lower side of the housing 320 to the magnet coupling hole 322 for fixing the magnet unit 310, And may be formed to be closed by the inner circumferential surface of the cover can 100. In the latter case, not only the bonding of the magnet part 310 and the magnet part fastening hole 322 in the bonding operation of the first bonding hole 323 according to the embodiment, but also the bonding of the magnet part 310 and the magnet part fastening hole 322, Bonding can be carried out, and it is possible to achieve more firm fixing.

The housing 320 includes a second bonding hole 324 formed between the first bonding holes 323 and through which the adhesive 600 for fixing the cover can 100 and the base 400 flows, . ≪ / RTI > The second bonding hole 324 according to the embodiment is opened toward the outside of the housing 320 like the first bonding hole 323 and is formed to be closed by the inner circumferential surface of the cover can 100. The adhesive 600 filled in the second bonding hole 324 firmly bonds the cover can 100 and the housing 320 and is firmly fastened to the upper surface of the base 400, I can do it. Here, the larger the application area of the adhesive 600 for the solid bonding with the base 400, the more preferable. Accordingly, the second bonding hole 324 may be formed at the edge of the housing 320, which has a relatively large joint area with the base 400.

Meanwhile, the base 400 may be disposed below the housing 320. The base 400 may function as a sensor holder for protecting an image sensor (not shown), which will be described later. In order to position an IR filter (not shown) in this case, . Also, the base may be formed without a sensor holder function according to the design.

In this case, the IR filter may be mounted on the hollow portion 430 formed at the center of the base 400. The IR filter may be equipped with an infrared ray filter. In addition, the IR filter may be formed of, for example, a film material or a glass material, and an IR blocking coating material may be disposed on a plate-shaped optical filter such as a cover glass for protecting an image sensing surface and a cover glass.

In addition, the base 400 may have two or more fixing projections 440 protruding from the upper edge thereof to be in contact with the inner surface of the cover can 100. The fixing projections 440 may be formed in the cover can 100 100), and at the same time, it can be firmly fixed after fastening.

In addition, the base 400 may have a coupling groove 410 into which the coupling piece 110 of the cover can 100 is inserted. The coupling groove 110 may be formed on the outer surface of the base 400 such that the coupling groove 110 has a length corresponding to the length of the coupling piece 110, May be integrally formed on the outer surface of the base 400 so that a portion can be inserted.

In addition, the actuator according to the embodiment of the present invention may be implemented as a camera module, and may further include a printed circuit board, a filter, and an image sensor.

The printed circuit board may be disposed under the base 400. An image sensor (not shown) is mounted on a central portion of the upper surface of the printed circuit board, and various devices (not shown) for driving the actuator may be mounted. The printed circuit board is electrically connected to the terminal unit 522 to apply a power source for driving the actuator unit 100, which will be described later, to the actuator unit 100.

The image sensor (not shown) may be mounted on the central portion of the upper surface of the printed circuit board so as to be positioned along the optical axis direction with at least one lens (not shown) accommodated in the lens portion 10. Such an image sensor converts an optical signal of an object incident through a lens into an electrical signal.

Meanwhile, the adhesive 600 may be embodied as a thermosetting epoxy or a UV epoxy and is cured by exposure to heat or UV. Here, the thermosetting epoxy is a method of directly or indirectly curing by applying heat, and UV (ultraviolet) epoxy is a method of applying UV (ultraviolet) to the adhesive 600 to cure.

In an embodiment, the adhesive 600 may be an epoxy in which thermosetting and UV (ultraviolet) curing may be mixed, and may be either thermosetting or UV (ultraviolet) curing, have. The adhesive 600 is not limited to the epoxy but may be any material that can be bonded.

In other words, the embodiment of the present invention can accommodate the moving part, the driving part, and the housing in the cover can, and the adhesive can be applied to the first bonding hole and the second bonding hole formed on the lower side of the housing by one- The productivity is improved due to a reduction in production facilities and personnel, and resin separation due to long-time adhesive residue is reduced, thereby improving reliability and durability due to rapid adhesion between the components.

The actuator according to this embodiment may be implemented as a camera module and may be provided in a mobile phone.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined by the appended claims. Range and its equivalent range.

100: cover can 200: mover
210: Bobbin 220: Nose portion
300: stator 310: magnet part
320: housing 323: first bonding hole
324: second bonding hole 400: base
500: elastic unit 510: upper spring
520: lower spring 600: adhesive

Claims (12)

A cover can forming an outer appearance;
A base coupled to a lower side of the cover can;
A movable part provided on the base and including a bobbin for fixing the lens part and a coil part provided on an outer surface of the bobbin;
And a stator including a magnet portion opposed to the outside of the coil portion and a housing for fixing the magnet portion,
The housing includes a magnet coupling hole formed on a side surface of the magnet coupling hole and corresponding to the magnet portion, and a first bonding portion formed on a lower surface of the magnet coupling hole to receive an adhesive for fixing the magnet portion to the magnet coupling hole, An actuator including a hole.
The method according to claim 1,
And the first bonding hole is opened toward the outside of the housing, and is closed by the inner circumferential surface of the cover can.
The method according to claim 1,
Wherein the housing is formed in a hexahedron shape in which upper and lower sides are open, and the magnet portion is provided on four side surfaces of the housing.
The method according to claim 1,
Wherein the housing further includes a second bonding hole formed between the first bonding holes and through which an adhesive for fixing the cover can and the base is introduced.
5. The method of claim 4,
And the second bonding hole is opened toward the outside of the housing, and is closed by the inner peripheral surface of the cover can.
5. The method of claim 4,
Wherein the housing is formed in a hexahedron shape in which upper and lower sides are opened, and the second bonding hole is formed at an edge of the housing, respectively.
The method according to claim 1,
Wherein the cover can is made of a metal material.
The method according to claim 1,
Wherein a lower end portion of the cover can is formed with at least one fastening piece on each surface thereof,
And an engaging groove into which the engaging piece is inserted is formed in the base.
The method according to claim 1,
And the stator includes a yoke portion for fixing the magnet portion.
10. The method of claim 9,
Wherein the yoke portion is embodied as the cover can.
11. The method of claim 10,
Wherein an upper surface of the cover can is formed with an opening through which the lens of the moving part is exposed, an inner yoke formed by bending the cover can inward is formed in the opening,
Wherein the bobbin has a groove portion formed on an outer circumferential surface thereof so that the inner yoke can be positioned between the bobbin and the coil portion wound on the bobbin.
A cover can forming an outer appearance;
A base coupled to a lower side of the cover can;
A movable part provided on the base and including a bobbin for fixing the lens part and a coil part provided on an outer surface of the bobbin;
A stator including a magnet portion opposed to the outside of the coil portion and a housing for fixing the magnet portion; And
And a printed circuit board for applying power to the coil portion,
Wherein the housing has a magnet coupling hole formed in a side surface of the magnet coupling hole and corresponding to the magnet portion, and at least two insertion holes formed in a lower side surface of the magnet coupling hole for introducing an adhesive for fixing the magnet portion to the magnet coupling hole, A camera module comprising a first bonding hole.

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