KR102151246B1 - Actuator for actuating lens - Google Patents

Abstract

An embodiment includes a mover including a bobbin fixing a lens part and a magnet part provided on an outer surface of the bobbin, a coil part disposed opposite to the outside of the magnet part, a housing to which the coil part is fastened, and a base supporting the housing It provides an actuator including a stator including a and a camera module including the same.

Description

Lens drive actuator {ACTUATOR FOR ACTUATING LENS}

An embodiment of the present invention relates to an actuator having an improved structure and a camera module including the same.

With the widespread use of various portable terminals and the commercialization of wireless Internet services, demands of consumers related to portable terminals are diversifying. Accordingly, various types of additional devices are installed in the portable terminals.

Among them, a typical camera module is a camera module that can take a photograph or video of a subject, store the image data, and edit and transmit it as necessary.

In recent years, cameras that want to realize high-resolution and miniaturization are used in various multimedia fields such as notebook personal computers, camera phones, PDAs, smart phones, toys, etc., as well as image input devices such as information terminals of surveillance cameras and video tape recorders. The module is being developed.

An actuator is provided to adjust the focus of the image of the camera module, and the coil part of the actuator part must be electrically connected to the printed circuit board in order to receive power from the printed circuit board.

In the electrical connection between the actuator and the printed circuit board, the conventional assembly tolerance increases, and the possibility of occurrence of defects may be high, so there is a need for a new structure to improve this.

The embodiment is to consider miniaturization and to provide a camera module with improved manufacturing tolerance and improved reliability.

An embodiment includes a mover including a bobbin fixing a lens part and a magnet part provided on an outer surface of the bobbin, a coil part disposed opposite to the outside of the magnet part, a housing to which the coil part is fastened, and a base supporting the housing It provides an actuator including a stator comprising a.

In addition, the housing may include a body in which a hollow part is formed, and a winding part formed below the body to which the coil part is wound.

In addition, the housing may include a coil latch protruding from the lower end of the winding unit to the outside.

In addition, the coil engaging jaw may be formed as an inclined surface closer to the winding portion from an upper side to a lower side.

In addition, the coil engaging jaw may be formed to protrude more than a thickness of the coil portion wound on the winding portion.

In addition, at least two winding portions may be formed on the body at equal intervals.

In addition, the lower side of the winding unit may further include two coil fixing portions protruding downward so that one end and the other end of the wound coil can be fixed respectively.

In addition, it may further include a pair of terminal portions fastened to the base and electrically connected to the coil portion to receive power from the outside.

In addition, it may further include an elastic unit that is fastened to the housing and the bobbin to provide a return force to the mover.

In addition, the elastic unit has one side fastened to the upper side of the body, the other side fastened to the upper side of the bobbin, and one side fastened between the housing and the base, and the other side fastened to the lower side of the bobbin. It may include a lower spring.

In addition, the upper spring may be formed in a shape corresponding to the upper surface of the housing, and may be a single leaf spring having a hollow portion.

In addition, the lower spring may be formed by two leaf springs that are symmetrically formed with each other.

In addition, each of the two leaf springs may include an outer portion fastened to the lower side of the housing, an inner portion fastened to the bobbin, and a connection portion having one end and the other end connected to the outer and inner portions to provide elastic force.

In addition, the pair of terminal portions may be formed to extend from the outer portion to the side of the base.

In addition, the base may have a concave groove formed on the side in a shape corresponding to the terminal portion.

In addition, the stator may further include an FP coil unit provided on an upper surface of the base so as to correspond to the magnet unit, and an FPCB that is fastened to an upper surface of the base by applying power to the FP coil unit.

In addition, it may further include a Hall sensor unit mounted to correspond to the magnet unit on the lower side of the FPCB.

In addition, an opening through which the lens unit is exposed may be formed on an upper side, and a cover can which is coupled to the base to receive the mover and the stator may be further included.

In addition, a stopper protruding adjacent to the cover can may be formed on the upper side of the housing.

In addition, a recessed recessed portion may be formed on the upper side of the base to correspond to the shape of the bobbin, and a through hole may be formed in the center of the recessed portion.

According to an embodiment of the present invention, a camera module with improved miniaturization, reduction in manufacturing tolerance, and improved reliability is implemented by improving the structure of the actuator unit.

1 is an exploded perspective view of an actuator according to an embodiment of the present invention.
2 is an exploded perspective view of the actuator shown in FIG. 1 as viewed from a lower side.
Figure 3 is an enlarged view of the housing shown in Figure 2;
Figure 4 is an enlarged view of the elastic unit shown in Figure 1;

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

Unless otherwise defined, all terms in the present specification are the same as the general meanings of terms understood by those skilled in the art, and if terms used in the present specification conflict with the general meanings of the terms, the definitions used in the present specification are applied.

However, the invention to be described below is only for describing an embodiment of the present invention, not for limiting the scope of the present invention, and reference numerals used identically throughout the specification denote the same elements.

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

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 the actuator shown in FIG. 1 as viewed from a lower side, and FIG. 3 is an enlarged view of the housing shown in FIG. 2, and FIG. 4 is It is an enlarged view of the elastic unit shown in FIG.

1 to 4, the actuator according to the embodiment may largely include an elastic unit 400, a mover 200, and a stator 300, and may further include a cover can 100.

The cover can 100 has an opening through which the lens unit (not shown) is exposed, and is fastened to a base 330 to be described later to accommodate the mover 200 and the stator 300, and It protects internal components from impact and prevents the penetration of external pollutants.

In addition, the cover can 100 must also perform a function of protecting components of the camera module from external radio wave interference generated by a mobile phone or the like. Therefore, the cover can 100 is preferably formed of a metal material.

In addition, the cover can 100 is mounted on the base 330 so that the inner surface of the cover can 100 is in close contact with the side surface of the base 330 to be described later. An extended fastening piece is formed, and a fastening groove into which the fastening piece is inserted is formed in the base 330 to be described later, so that a more robust sealing function and a fastening function of the camera module may be implemented.

Meanwhile, the mover 200 includes a bobbin 210 for fixing the lens unit, and a magnet unit 220 provided on an outer surface of the bobbin 210.

The lens unit (not shown) may be a lens barrel including at least one lens, but is not limited thereto, and any holder structure capable of supporting the lens may be included. In the embodiment, a case where the lens unit is a lens barrel is described as an example. The lens unit is installed above the base 330 to be described later, and is disposed at a position corresponding to the image sensor.

The inner circumferential surface of the bobbin 210 is formed with a screw thread 211 and is coupled to the outer circumferential surface of the lens unit to fix the lens unit, and the coupling with the lens unit may be performed by a threaded connection method as shown. It is formed as a thread and can be bonded with an adhesive. Of course, you can use an adhesive for a solid fastening even after bonding by threading.

The outer circumferential surface of the bobbin 210 may be formed with a mounting groove 212 in which a magnet part 220 to be described later is mounted. The mounting groove 212 has a shape corresponding to the shape of the magnet part 220 and may be concavely formed on the outer surface of the bobbin 210, and spaced at equal intervals along the outer surface of the bobbin 210 Can be formed.

In addition, upper and lower springs 410 and 420 are fastened to the upper and lower surfaces of the bobbin 210 so that the bobbin 210 can be floated and positioned on the upper side of the base 330 to be described later. The fastening protrusion 213 may be formed.

The magnet part 220 may be mounted as an adhesive on the outer surface of the bobbin 210, and the magnet part 220 is shown with four rectangular magnets spaced at equal intervals, but the bobbin 210 It may vary depending on the shape of the outer surface or the mounting position.

On the other hand, the stator 300 includes a coil unit 310 disposed to face the outside of the magnet unit 220, a housing 320 to which the coil unit 310 is fastened, and the housing 320 It may include a base 330.

Specifically, the coil unit 310 is provided to be disposed at a position corresponding to the outer surface of the magnet unit 220. The coil unit 310 may be formed as a single coil wound on the winding unit 322 of the housing 320 to be described later, but is mounted on the housing 320 as four individual coils in a track shape like an FP coil. It could be. The coil unit 310 may move the mover 200 by receiving power applied from a printed circuit board (not shown) to be described later to form an electromagnetic field.

The housing 320 may be formed in a shape corresponding to the inner surface of the cover can 100 forming the exterior of the camera module. In an embodiment, the housing 320 is formed in a hexahedral shape corresponding to the shape of the cover can 100, and the upper and lower sides are open to support the mover 200.

Specifically, the housing 320 may include a body 321 having a hollow portion formed thereon, and a winding portion 322 formed below the body 321 to which the coil portion 310 is wound.

As described above, the body 321 may be formed in a shape corresponding to the inner surface of the cover can 100. A stopper 323 protruding adjacent to the cover can 100 is formed on the upper side of the body 321 to absorb the shock by contacting the upper surface of the cover can 100 when an external impact is applied and the mover ( By limiting the upward movement of the 200), it is possible to prevent the mover 200 from being damaged. The stopper 323 may also function as a protrusion to which the upper spring 410, which will be described later, may be fastened.

Further, the winding part 322 may be provided in a rectangular shape extending on the lower side of the body 321, but at least two or more may be formed on the body 321 at equal intervals. That is, as shown, four winding portions 322 may be formed at the corners of the body 321.

In addition, since the coil part 310 is wound on the winding part 322, the housing 320 protrudes outward from the lower end of the winding part 322 to protect the coil part 310. It may include a coil locking jaw 324. Such a coil engaging jaw 324 may be formed to protrude in a rectangular shape as shown, but is formed in an inclined surface closer to the winding unit 322 as it goes from the top to the bottom, so that it is pre-wound from the bottom to the top or a ring It may be formed to insert the shaped coil portion 310. The coil engaging jaw 324 is formed to protrude more than the thickness of the coil portion 310 wound around the winding portion 322 to prevent the wound coil portion 310 from contacting the cover can 100 and being shorted It can be protected from external impact.

In addition, the lower side of the winding unit 322 may further include two coil fixing portions 325 protruding downward so that one end and the other end of the wound coil can be fixed, respectively. This is because when both ends of the coil of the coil unit 310 are wound 1 to 3 times and fixed to the coil fixing unit 325, soldering with the terminal unit 500, which will be described later, is facilitated.

Components of the above-described housing 320 may be formed integrally, such as formed of an injection product or formed using a press processing method.

The base 330 supports the stator 300 and the mover 200 and is formed in a shape corresponding to the cover can 100. The base 330 may be provided to position an IR filter (not shown) while performing a sensor holder function to protect an image sensor (not shown) to be described later.

In addition, the base 330 may be formed with two or more fixing protrusions 331 protruding from the upper edge to make an interview with the inner surface of the cover can 100, and such fixing protrusions 331 are the cover cans ( It guides the fastening of 100) easily and at the same time makes it possible to secure firmly after fastening.

In addition, the upper side of the base 330 is formed with a recess 332 concave to correspond to the shape of the bobbin 210, so that the mover 200 can be moved downward, thereby providing a focusing function. It can improve and reduce current consumption.

In addition, a through hole 332a is formed in the center of the recess part 332 so that the IR filter (infrared cut filter) may be mounted in the through hole 332a, and the IR filter is a bottom surface of the base or Can be assembled on the upper side. The IR filter may be provided with an infrared filter (Infrared Ray Filter). In addition, the IR filter may be formed of, for example, a film material or a glass material, and an infrared blocking coating material may be disposed on a flat optical filter such as a cover glass or cover glass for protecting an imaging surface.

In addition, in order to fix the pair of terminal portions 500 that are electrically connected to the coil portion 310 to receive power from the outside, the base 330 is concave on the side in a shape corresponding to the terminal portion 500 The concave groove 333 may be formed.

Further, although the base 330 is not shown, a fastening groove (not shown) into which a fastening piece that may be formed in the cover can 100 is inserted may be formed. These fastening grooves are formed locally on the outer surface of the base 330 in a shape corresponding to the length of the fastening piece, or the base 330 so that a predetermined portion of the lower end of the cover can 100 including the fastening piece can be inserted. ) Can be formed entirely on the outer surface.

The actuator unit according to this embodiment fixes the lens unit so as to be positioned therein, and adjusts the focus of the image by moving the lens unit.

Here, adjusting the focus of the image means an AF (Auto Focusing) function that moves the lens unit in the z-axis direction, which is the optical axis direction, for focusing near or far distance of the subject, or perpendicular to the z-axis direction for camera shake correction. It may mean an OIS (Optical Image Stabilization) function for moving the lens unit in the x- and y-axis directions, or a function capable of simultaneously performing the AF function and the OIS function.

That is, the actuator unit may be implemented as an A.F (Auto Focusing) type as shown, or may be implemented as an OIS (Optical Image Stabilization) type although not shown. In this case, the following components may be additionally provided to the A.F type components.

The stator 300 has an FP coil unit provided to correspond to the magnet unit 220 on the upper side of the base 330, and the FP coil unit is supplied with power and is fastened to the upper side of the base 330. It may further include a flexible printed circuit board (FPCB).

The FP coil unit is mounted on the FPCB provided above the base 330 to be described later, and a through hole (not shown) is formed in the center to pass the optical signal of the lens unit (not shown). Meanwhile, when considering miniaturization of the camera module, specifically, lowering the height in the z-axis direction, which is the optical axis direction, the second coil unit 310 may be formed of an FP coil, which is a patterned coil.

The FPCB may be provided on an upper surface of the base 330 to apply power to the second coil part 310, and a through hole (not shown) corresponding to the through hole of the FP coil part is formed. .

In addition, although not shown, in the case of the latter OIS (Optical Image Stabilization) type, a Hall sensor unit (not shown) mounted to correspond to the magnet unit 220 on the lower side of the FPCB may be further included. .

The Hall sensor unit senses a voltage applied to detect movement of the magnet unit 220 and an intensity and phase of a current flowing through the coil, and is provided to precisely control the actuator by interacting with the FPCB.

The Hall sensor unit is provided in a straight line with respect to the magnet unit 220 and the optical axis direction, and must sense the displacement of the x-axis and the y-axis, so the Hall sensor unit is provided at two adjacent corners of the FPCB. It includes two Hall sensors, and a Hall sensor receiving groove capable of accommodating the Hall sensor may be formed in the base 330.

Such a Hall sensor unit is provided adjacent to the FP coil unit than the magnet unit 220, but considering that the strength of the magnetic field formed in the magnet is several hundred times greater than the strength of the electromagnetic field formed in the coil, the movement of the magnet unit 220 The influence of the FP coil part on sensing is not considered.

Meanwhile, the actuator according to the embodiment of the present invention may further include an elastic unit 400 for providing a return force to the mover 200 by being fastened to the housing 320 and the bobbin 210.

The elastic unit 400 includes an upper spring 410 having one side fastened to the upper side of the body 321 and the other side fastened to the upper side of the bobbin 210, and one side of the housing 320 and the base ( It may include a lower spring 420 is fixed between the 330 and the other side is fastened to the lower surface of the bobbin 210.

The upper spring 410 and the lower spring 420 may be formed of separate springs disposed on each side of the housing 320, but for the efficiency of production, a single plate material is bent and cut into a plate spring shape. It is preferably made.

Accordingly, the upper spring 410 and the lower spring 420 have an approximately ring shape, and the inner periphery is formed in a substantially circular shape to correspond to the shape of the moving part, and the outer periphery of the housing 320 and the base 330 It is made in an approximately square shape so that it can be supported by the shape.

Specifically, the upper spring 410 is formed in a shape corresponding to the upper surface of the housing 320, is formed as a single leaf spring having a hollow part (410a), the upper end side of the mover 200 Support.

4, the lower spring 420 may be a plate spring formed of a single plate material like the upper spring 410, but formed symmetrically or asymmetrically to apply power to the coil unit 310 It can be formed by two leaf springs.

Each of the two leaf springs includes an outer portion 421 fastened to the upper side of the base 330, an inner portion 422 formed in a hemispherical shape and fastened to the bobbin 210, and the outer portion 421 and an inner portion. One end and the other end may be connected to 422 to include a connection part 423 for providing an elastic force. The connection part 423 may include two or more bent parts, and as shown in FIG. 1, a separate terminal 500 may be electrically connected to the two leaf springs, respectively.

On the other hand, unlike shown, the pair of terminal portions 500 may be integrally bent from each of the two outer portions 421 to a side surface of the base 330 to extend. In this case, too, it may be mounted and fixed in the concave groove 333 formed on the side of the base 330.

That is, the actuator unit according to the embodiment of the bobbin 210, the housing 320, or the base 330 to position the magnet unit 220 on the bobbin 210 and the coil unit 310 on the housing 320 The structure has been improved, and the internal structure for connecting power to the actuator is improved by this structural feature, so that miniaturization, ease of assembly work, and reliability can be improved.

Meanwhile, the actuator unit according to the embodiment may be provided in the camera module, and although this camera module is not shown, it may further include a printed circuit board, an IR filter, an image sensor, and the like.

The printed circuit board has an image sensor (not shown) mounted in the center of the upper side, and various devices (not shown) for driving the camera module may be mounted. In addition, the printed circuit board is electrically connected through the coil unit 310 and the terminal unit 500 to apply power to the actuator unit to drive an actuator unit to be described later.

The image sensor (not shown) may be mounted in the center of the upper side of the printed circuit board so that it can be positioned along the optical axis direction with one or more lenses (not shown) accommodated in the lens unit. Such an image sensor converts an optical signal of an object incident through the lens into an electrical signal.

In addition, in order to apply power to the coil unit 310, the printed circuit board may have soldering points at two locations so as to be electrically connected to the terminal unit 500.

The adhesive described in the examples may be implemented with a thermosetting epoxy or UV epoxy, and is cured by exposure to heat or UV. However, if a thermosetting epoxy is used, it is a method of curing by moving it to an oven or by directly applying heat, and if a UV (ultraviolet) epoxy is used, it is a method of curing by applying UV (ultraviolet) to the adhesive.

In addition, the adhesive may be an epoxy that can be mixed with heat curing and UV (ultraviolet) curing, and both thermal curing and UV (ultraviolet) curing are possible, and thus may be an epoxy that can be cured by selecting any one of them. The adhesive is not limited to the epoxy, and any adhesive material can be substituted.

From the above description, those skilled in the art will recognize that various changes and modifications can be made without departing from the technical spirit of the present invention, and the technical scope of the present invention is not limited to the contents described in the embodiments, but claims It should be determined according to the scope and the scope equivalent thereto.

100: cover can 200: mover
210: bobbin 220: magnet part
300: stator 310: coil part
320: housing 321: body
322: winding part 323: stopper
324: coil jamming jaw 325: coil fixing unit
330: base 333: concave
400: elastic unit 410: upper spring
420: lower spring 421: outer portion
422: inner part 423: connection part

Claims (20)

A cover can including a top plate and a side plate extending from the top plate;
A housing disposed in the cover can;
A bobbin disposed in the housing;
A magnet disposed on the outer surface of the bobbin; And
And a coil disposed in the housing and facing the magnet,
The cover can includes a first side plate and a second side plate, and a first corner disposed between the first side plate and the second side plate,
The housing includes a body, a winding portion extending from a lower surface of the body, and a coil latch protruding from an outer surface of the winding portion,
The coil is disposed on the coil engaging jaw of the housing,
The outer surface of the winding part of the housing includes a first surface facing the first side plate of the cover can, a second surface facing the second side plate of the cover can, and the first surface and the second surface. And a third surface disposed between the surfaces and facing the first corner of the cover can,
The coil engaging jaw of the housing protrudes outward from the first and second surfaces of the winding part of the housing. The method of claim 1,
The winding portion of the housing includes a coil fixing portion protruding from a lower surface of the winding portion,
Both ends of the coil are wound around the coil fixing part. The method of claim 2,
And a terminal part electrically connected to the coil and receiving power from the outside,
An actuator coupled to the terminal portion by soldering the both ends of the coil wound around the coil fixing portion. The method of claim 1,
The coil engaging jaw is an actuator protruding outward from the coil. The method of claim 1,
The cover can includes a third side plate disposed opposite the first side plate, a fourth side plate disposed opposite the second side plate, and a second corner disposed between the second side plate and the third side plate, A third corner disposed between the third side plate and the fourth side plate, and a fourth corner disposed between the fourth side plate and the first side plate,
The winding portion includes first to fourth winding portions spaced apart from each other,
The first to fourth winding portions are actuators facing each of the first to fourth corners of the cover can. The method of claim 1,
The outer surface of the bobbin includes a first outer surface on which the magnet is disposed, and a second outer surface on which the magnet is not disposed,
An actuator in which the winding part of the housing faces the second outer surface of the bobbin. The method of claim 6,
The first outer surface of the bobbin includes a plane,
The second outer side surface of the bobbin includes a curved surface,
The inner surface of the winding part of the housing includes a curved surface. The method of claim 1,
The winding portion of the housing includes a coil fixing portion protruding from a lower surface of the winding portion,
The coil fixing part includes two coil fixing parts,
Any one of the two coil fixing portions faces the first side plate of the cover can,
The other one of the two coil fixing portions is an actuator facing the second side plate of the cover can. The method of claim 8,
The coil fixing part is an actuator disposed under the coil engaging jaw. The method of claim 1,
It includes a lower spring coupled to the lower surface of the bobbin,
The lower spring includes two leaf springs spaced apart from each other,
Each of the two leaf springs of the lower spring includes an outer portion coupled to a lower surface of the housing, an inner portion coupled to the lower surface of the bobbin, and a connection portion connecting the outer portion and the inner portion. The method of claim 10,
A base coupled to the side plate of the cover can, and a terminal disposed on the base,
The terminal is bent from the outer portion of the lower spring to the side of the base. The method of claim 1,
A base coupled to the side plate of the cover can, and a terminal disposed on the base,
The base includes a groove recessed from the side of the base,
The terminal is an actuator disposed in the groove of the base. The method of claim 1,
Including a base coupled to the side plate of the cover can,
An actuator including an FP coil part provided on an upper surface of the base to correspond to the magnet, and a flexible printed circuit board (FPCB) for applying power to the FP coil part. Printed circuit board;
An image sensor disposed on the printed circuit board;
The actuator of claim 1; And
A camera module including a lens coupled to the bobbin of the actuator and disposed at a position corresponding to the image sensor. A portable terminal comprising the camera module of claim 14. A cover can including a top plate and a side plate extending from the top plate;
A housing disposed in the cover can;
A bobbin disposed in the housing;
A magnet disposed on the outer surface of the bobbin;
A coil disposed in the housing and facing the magnet; And
And a terminal part electrically connected to the coil and receiving power from the outside,
The housing includes a body, a winding part extending from a lower surface of the body, a coil engaging jaw protruding from an outer surface of the winding part, and a coil fixing part protruding from the lower surface of the winding part and winding both ends of the coil. Including,
An actuator coupled to the terminal portion by soldering the both ends of the coil wound around the coil fixing portion. The method of claim 16,
The cover can includes a first side plate and a second side plate, and a first corner disposed between the first side plate and the second side plate,
The outer surface of the winding part of the housing includes a first surface facing the first side plate of the cover can, a second surface facing the second side plate of the cover can, and the first surface and the second surface. And a third surface disposed between the surfaces and facing the first corner of the cover can,
The coil engaging jaw of the housing protrudes outward from the first and second surfaces of the winding part of the housing. The method of claim 16,
The coil engaging jaw is an actuator protruding outward from the coil. The method of claim 16,
The cover can includes first to fourth side plates and first to fourth corners disposed between the first to fourth side plates,
The winding portion is an actuator comprising four winding portions facing each other and spaced apart from the first to fourth corners of the cover can. A cover can including a top plate and a side plate extending from the top plate;
A mover including a bobbin and a magnet disposed on an outer surface of the bobbin; And
And a stator including a coil facing the magnet and a housing in which the coil is disposed,
The cover can includes a first side plate and a second side plate, and a first corner disposed between the first side plate and the second side plate,
The housing includes a body, a winding portion extending from a lower surface of the body, and a coil latch protruding from an outer surface of the winding portion,
The coil is disposed on the coil engaging jaw of the housing,
The winding part of the housing is disposed between a first surface facing the first side plate of the cover can, a second surface facing the second side plate of the cover can, and the first surface and the second surface And a third surface facing the first corner of the cover can,
The coil engaging jaw of the housing protrudes outward from the first and second surfaces of the winding part of the housing.

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