KR102131420B1 - Motor for actuating lens - Google Patents

Abstract

In an embodiment, the first mover disposed on the side of the lens portion to move the lens portion, the second mover positioned opposite to the first mover on the side of the first mover, and the second mover In order to do so, it is positioned opposite to the lower side of the second mover and a hollow hole corresponding to the lens portion is formed in the center, and a hollow hole supporting the stator and the second mover and corresponding to the through hole of the second mover Provided is a lens driving motor including a base formed in the center and having a seating protrusion protruding from an upper surface on which the hollow hole is formed such that a through hole of the second mover is inserted to fix the second mover.

Description

Lens driving motor {MOTOR FOR ACTUATING LENS}

An embodiment of the present invention relates to a lens driving motor with improved structure.

2. Description of the Related Art As the spread of various portable terminals is widely generalized and wireless Internet services are commercialized, the needs of consumers related to the portable terminals are also diversified, and accordingly various types of additional devices are mounted on the portable terminals.

Among them, a lens driving motor is a typical one that can take a picture or a video of a subject, store the image data, and edit and transmit it as needed.

In recent years, the demand for a small lens driving motor is increasing for image input devices, such as surveillance cameras or video tape recorder information terminals, in a variety of multimedia fields such as notebook personal computers, camera phones, PDAs, smarts, and toys. have.

Conventional lens driving motors can be classified into lens driving motors such as F.F (Fixed Focus) type, A.F (Auto Focus) type, and OIS (Optical Image Stabilization) type.

Here, the lens driving motors are constantly being developed to protect components inside the cover can from foreign substances that are commonly infiltrated or generated. In particular, in the case of the OIS type, FPCB as a component for implementing an anti-shake function Although it is provided with a lamp, a problem that may occur when processing into a shape suitable for the inside of a lens driving motor or that may be penetrated into an image sensor or the like by a foreign material generated later may occur.

Such a foreign material may be a problem because the quality and performance of the lens driving motor are deteriorated.

In addition, the fixing of the FPCB and the coil part mounted on the base is lifted from the base after a lapse of time, and thus there is a problem that the reliability of the lens driving motor may be deteriorated.

The embodiment prevents the image sensor and the like from being contaminated from foreign objects, and provides a lens driving motor with improved reliability by firmly implementing the fastening to the base of the stator.

In an embodiment, the first mover disposed on the side of the lens portion to move the lens portion, the second mover positioned opposite to the first mover on the side of the first mover, and the second mover In order to do so, it is positioned opposite to the lower side of the second mover, and a hollow hole corresponding to the lens portion is formed in the center, and a hollow hole supporting the stator and the second mover and corresponding to the through hole of the second mover Provided is a lens driving motor including a base formed in the center and having a seating protrusion protruding from an upper surface on which the hollow hole is formed such that a through hole of the second mover is inserted to fix the second mover.

In addition, the seating protrusion may be formed integrally with the base.

In addition, the seating protrusion may be formed to protrude in the shape of a circular rim.

Further, the seating protrusion may be formed by protruding at least two protrusions at equal intervals.

In addition, the first mover includes a bobbin fixing the lens portion and a first coil portion provided on an outer circumferential surface of the bobbin, and the second mover includes a magnet portion and the magnet portion disposed to face the first coil portion. It includes a fixed housing, and the stator may include a second coil portion positioned opposite to the lower side of the magnet portion and an FPCB for applying power by fastening the second coil portion to an upper side.

In addition, at least two or more adhesive grooves formed in an outer direction of the seating protrusion may be formed on an upper surface of the base, and the indentation groove formed in a position corresponding to the adhesive groove may be formed.

In addition, the recess groove may be formed to have a diameter larger than the diameter of the adhesive groove.

Also, the second coil part may be an FP coil.

In addition, an elastic unit for providing a return force to the first mover and the second mover may be further included.

In addition, the elastic unit may include a lower spring that is fastened to the lower surface of the bobbin and the housing, an upper spring that is fastened to the upper surface of the bobbin and the housing, and a side spring that is fastened to the side of the bobbin.

In addition, the elastic unit may be a plate spring.

In addition, a hall sensor unit mounted on the lower surface of the FPCB may be further included to correspond to the position of the magnet unit.

In addition, the cover can be formed by receiving the first mover, the stator and the second mover to be mounted on the base to form the appearance of the lens driving motor.

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

In addition, the base is mounted on the upper side, the center may further include a printed circuit board on which an image sensor for converting an optical signal incident from the lens unit is mounted.

According to an embodiment of the present invention, a lens driving motor having improved reliability is realized by preventing a penetration of an alien substance generated from an internal component of the lens driving motor into an image sensor by having a seating protrusion.

1 is a combined perspective view of a lens driving motor according to an embodiment of the present invention.
2 is an exploded perspective view of a lens driving motor according to an embodiment of the present invention.
3 is a combined perspective view of the base and the stator according to an embodiment of the present invention.
4 is a perspective view of a base according to an embodiment of the present invention.

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

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

However, the invention to be described below is only for describing the embodiments of the present invention and is not intended to limit the scope of the present invention, and the same reference numerals are used throughout the specification.
Hereinafter, the'hollow hole 510' may be referred to as a'hole', the'seating protrusion 550' may be referred to as a'protrusion', and the hall sensor receiving groove 540 may be referred to as a'home 540'.

Hereinafter, the lens driving motor of the embodiment will be described in detail with reference to the drawings.

1 is an exploded perspective view of a lens driving motor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a lens driving motor according to an embodiment of the present invention, and FIG. 3 is a base and a stator according to an embodiment of the present invention. 4 is a perspective view of a base according to an embodiment of the present invention.

1 to 4, the lens driving motor according to the embodiment is largely cover can 100, the first mover 200, the second mover 300, the stator 400, the base 500 and It may include an elastic unit 700. In addition, although the lens driving motor is not shown, it may further include a printed circuit board, an IR filter, an image sensor, and the like.

The cover can 100 accommodates the elastic unit 700, the first mover 200, the stator 400 and the second mover 300, which will be described later, and is mounted on the base 500 so that the appearance of the lens driving motor To form. Specifically, the cover can 100 is mounted on the base 500 in close contact with a part or all of the side portion of the base 500, the inner surface of which will be described later, and protects internal components from external impact and external contamination. It has the function of preventing material penetration.

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

The cover can 100 may be implemented as a yoke portion itself, which will be described later, or may be fixed by molding the yoke portion inside. In an embodiment, an upper surface of the cover can 100 is formed with an opening 110 through which a lens part (not shown) is exposed, and a lower portion of the upper surface of the cover can 100 is bent inside the cover can 100. The formed inner yoke (not shown) may be formed. The inner yoke may be located in the recess 213 formed in the bobbin 210 to be described later. In this case, the inner yoke may be disposed at an edge around the upper side opening of the yoke portion or may be disposed on the side surface, and the indentation portion of the bobbin may be formed at a corresponding position.

In addition, the cover can 100 may be formed with at least one fastening piece 120 formed on at least one surface of each of the lower ends, and the fastening groove 520 in which the fastening piece 120 is inserted into the base 500 to be described later. ) Is formed to realize a more robust sealing function and fastening function of the lens driving motor. Also, the fastening piece and the fastening groove may not be separately formed, or only one of them may be formed.

Meanwhile, the first mover 200 is disposed on the side of the lens unit to move the lens unit (not shown). The first mover 200 includes a bobbin 210 fixing the lens unit and a first coil unit 220 provided on an outer circumferential surface of the bobbin 210.

The lens unit (not shown) may be a lens barrel provided with one or more lenses (not shown), but is not limited thereto, and any holder structure capable of supporting the lens may be included.

The inner peripheral surface of the bobbin 210 is coupled to the outer peripheral surface of the lens unit to fix the lens unit. In addition, the bobbin 210 may be formed on the outer circumferential surface of the guide portion 211 that guides the first coil portion 220 to be wound or mounted. The guide portion 211 may be integrally formed with the outer surface of the bobbin 210, and may be continuously formed along the outer surface of the bobbin 210 or spaced apart at predetermined intervals.

In addition, an upper spring 710 or a lower spring 720 provided on the upper side and the lower side of the bobbin 210 so that the bobbin 210 is supported on the upper side of the base 500 to be described later. A fastening protrusion 212 may be formed.

In addition, the bobbin 210 is formed on the outer circumferential surface so that the inner yoke of the cover can 100, which will be described later, can be positioned between the bobbin 210 and the first coil portion 220 wound on the bobbin 210. The mouth portion 213 may be further included.

In addition, the first coil portion 220 may be guided to the guide portion 211 and wound on the outer surface of the bobbin 210, but four individual coils are 90° to the outer surface of the bobbin 210. It can also be arranged at intervals. The first coil unit 220 may receive an electric power applied from a printed circuit board (not shown), which will be described later, to form an electromagnetic field.

On the other hand, the second mover 300 is located on the side of the first mover 200 facing the first mover 200, the magnet is disposed to face the first coil unit 220 A portion 310 and a housing 320 to which the magnet portion 310 is fixed may be included.

Specifically, the magnet part 310 is mounted with an adhesive or the like on the housing 320 so that it can be disposed at a position corresponding to the outer surface of the first coil part 220, and 4 inside the housing 320. Equipped at equal intervals on the corners of the dog, efficient use of the internal volume can be achieved.

The housing 320 may be formed in a shape corresponding to the inner surface of the cover can 100 forming the appearance of the lens driving motor. In addition, the housing 320 is formed of an insulating material, and may be made as an injection material in consideration of productivity, and the housing 320 is a moving part for driving the OIS and is disposed to be spaced apart from the cover can 100 by a certain distance. Can.

In an embodiment, the housing 320 is spaced apart a predetermined distance corresponding to the shape of the cover can 100 to form a hexahedral shape, and the upper and lower sides are opened to support the first mover 200. In addition, the housing 320 may include a magnet part fastening hole 311 or a magnet part fastening groove formed in a shape corresponding to the magnet part 310 on the side surface.

In addition, at least two stoppers 312 capable of absorbing an impact may be formed on the upper surface of the housing 320 by protruding at a predetermined distance and contacting the upper surface of the cover can 100 upon external impact. . The stopper 312 may be integrally formed with the housing 320.

In addition, an upper spring 710 or a lower spring 720 provided on the upper side and the lower side of the housing 320 to support the housing 320 on the upper side of the base 500 to be described later is fastened. A fastening protrusion 313 may be formed.

On the other hand, the stator 400 is positioned opposite to the lower side of the second mover 300 to move the second mover 300, the through holes 411, 421 corresponding to the lens portion It is formed in the center.

Specifically, the stator 400 is disposed on the lower side of the magnet portion 310, the second coil portion 410, and the second coil portion 410 is disposed on the upper side to apply power to the substrate Includes, the substrate includes a flexible printed circuit board (FPCB) (420).

The second coil part 410 may be mounted on an FPCB 420 provided on an upper side of the base 500, which will be described later, or formed on an FPCB or a substrate, to pass an optical signal from the lens part (not shown). A through hole 411 is formed in the center. On the other hand, when considering miniaturization of the lens driving motor, specifically, lowering the height in the z-axis direction, which is the optical axis direction, the second coil part 410 is formed of an FP coil, which is a patterned coil, and the FPCB. It can be placed on.

The FPCB 420 may be provided on the upper surface of the base 500 to apply power to the second coil portion 410, and corresponds to a through hole 411 of the second coil portion 410. The through hole 421 is formed. In addition, the FPCB 420 includes a terminal portion 422 at which one end or opposite ends thereof are bent and protrude downward from the base 500, and external power can be supplied as the terminal portion 422.

In addition, the embodiment may further include a hall sensor unit (not shown) mounted on the lower or upper surface of the FPCB 420 to correspond to the position of the magnet unit 310.

The hall sensor unit senses the voltage applied to sense the movement of the magnet unit 310 and the intensity and phase of the current flowing through the coil, and is provided to precisely control the actuator by interacting with the FPCB 420. .

The hall sensor unit may be provided in a straight line with respect to the direction of the optical axis with the magnet unit 310, and since the displacement of the x-axis and y-axis must be sensed, the hall sensor unit has two adjacent corners of the edge of the FPCB 420. Each of the corners includes two Hall sensors, and a Hall sensor receiving groove 540 capable of accommodating the Hall sensor may be formed in the base 500. In addition, one or more Hall sensors may be provided.

The hall sensor unit is provided adjacent to the second coil unit 410 than the magnet unit 310, but considering that the strength of the magnetic field formed in the magnet unit is several hundred times greater than that of the electromagnetic field formed in the coil unit, the magnet unit The influence of the second coil unit 410 in the movement detection of 310 is not considered.

By the independent or organic interaction of the first mover 200, the second mover, and the stator 400, the lens portion is moved in all directions so that the first mover 200 and/or the second mover 300 ) To focus the image focus of the subject, and to compensate for camera shake and the like by the interaction of the first mover 200 and/or the second mover 300.

Meanwhile, the base 500 supports the stator 400 and the second mover 300, and a hollow hole 510 corresponding to the through holes 411 and 421 is formed in the center.

The base 500 may perform a sensor holder function to protect an image sensor (not shown), which will be described later, and may be provided to position an IR filter (not shown).

In this case, the IR filter may be mounted in the hollow hole 510 formed in the center of the base 500, and an infrared ray filter may be provided. In addition, the IR filter may be formed of, for example, a film material or a glass material, and an infrared ray blocking coating material or the like may be disposed on a plate-shaped optical filter such as a cover glass for protecting an imaging surface or a cover glass. In addition, a separate sensor holder may be located under the base in addition to the base.

In addition, the base 500 may be formed at one or more fixing protrusions 530 protruding from the upper edge and interviewing or engaging the inner surface of the cover can 100, and such fixing protrusions 530 include the cover. It is possible to easily guide the fastening of the can 100, and at the same time, to secure a firm fixation after fastening.

In addition, the base 500 may be formed with a fastening groove 520 into which the fastening piece 120 of the cover can 100 is inserted. The fastening groove 520 is formed locally on the outer surface of the base 500 in a shape corresponding to the length of the fastening piece 120, or a predetermined bottom of the cover can 100 including the fastening piece 120 It may be formed entirely on the outer surface of the base 500 so that the portion can be inserted.

Here, foreign substances may enter through the through holes 411 and 421 and the hollow holes 510 of the stator 400 and the base 500, and these foreign substances are mounted on a printed circuit board provided on the lower side. , It may degrade the performance of the lens driving motor by contaminating the image sensor. Particularly, when the OIS (Optical Image Stabilization) function is provided, the FP coil and/or the FPCB 420 is used. Through holes 411 and 421 are formed in the central portion, and shapes according to other lens driving motors are processed. There are many foreign matters generated by such processing, and even after cleaning, foreign matters may remain, which may cause problems.

Therefore, the embodiment of the present invention includes a seating protrusion 550 protruding from the upper surface of the base 500 on which the hollow hole 510 is formed.

Specifically, the seating protrusion 550 is inserted into the through holes 411 and 421 of the stator 400 and is formed to surround the inner circumferential surfaces of the through holes 411 and 421 of the stator 400. The seating protrusion 550 may be formed to have the same or smaller diameter than the inner circumferential surfaces of the through holes 411 and 421 of the stator 400.

In addition, the seating protrusion 550 may be formed integrally with the base 500, and may be formed to protrude in the shape of a circular rim as shown, or at least two or more protrusions protrude at equal or predetermined intervals. Can be formed.

In addition, in order to prevent the occurrence of foreign matter from the stator 400 and to securely mount the stator 400, the embodiment may further include the following features.

On the upper side of the base 500, at least two or more adhesive grooves 560 are formed in an outer direction of the seating protrusion 550, and the stator 400 is positioned at a position corresponding to the adhesive groove 560. The formed recess grooves 413 and 423 may be formed.

That is, the recess grooves 413 and 423 are formed to correspond to the second coil part 410 and the FPCB 420, respectively, and are small circular hole shapes formed outside the respective through holes 411 and 421. It can be formed as.

Referring to FIG. 3, when the stator 400 is mounted on the base 500 and then the adhesive is injected into the recesses 413 and 423, the adhesive introduced into the recesses 413 and 423 is seated. It is introduced between the outer circumferential surface of the protrusion 550 and the inner circumferential surfaces of the through holes 411 and 421 of the stator 400 to suppress the occurrence of further foreign matter and to secure the mounting of the stator 400. It is introduced into the adhesive groove 560 formed in the base 500 to allow a more robust mounting.

In addition, a dust trap may be formed on a peripheral portion of the through hole 510 on an upper surface of the base, which may be formed of epoxy or the like. It may be formed around a circle having a size larger than the through-hole, and may be formed in various shapes such as a square shape. The seating protrusion and the dust trap may be formed together, and it is also possible that only one of them is formed.

On the other hand, the embodiment further includes an elastic unit 700 for providing a return force to the first mover 200 and the second mover 300, the elastic unit 700 is the efficiency of production and For miniaturization of the lens driving motor, it is preferable that a single plate is made of a bent and cut plate spring as shown.

The elastic unit 700 includes a lower spring 720 fastened to the lower surface of the bobbin 210 and the housing 320, and an upper spring 710 fastened to the upper surface of the bobbin 210 and the housing 320. ) And a side spring 730 fastened to the side of the bobbin 210.

Two of the side springs 730 receive power from a printed circuit board (not shown), which will be described later, and transmits the power to the upper spring 710, and the upper spring 710 transmits the transmitted power back to the first coil part. The two side springs 730, the upper spring 710, and the first coil unit 220 may be electrically connected so as to be transmitted to the 220. At this time, the upper spring can also be composed of two, each of which can function as two terminals.

In other words, the upper, lower, and side springs 710, 720, and 730 may be formed of connecting portions connecting the first fastening portion and the second fastening portion, and the first fastening portion and the second fastening portion, respectively. It may be implemented as at least two or more bending parts to connect the first fastening part and the second fastening part. Here, the first fastening part is a part coupled to the housing, and the second fastening part may be a part connected to the bobbin, and vice versa.

In addition, the lens driving motor according to the embodiment of the present invention may further include a printed circuit board (not shown), and the printed circuit board may be mounted under the base 500. The printed circuit board is mounted with an image sensor (not shown) in the center of the upper side, and various elements (not shown) for driving the lens driving motor may be mounted. In addition, the printed circuit board may be electrically connected to the above-described side spring 730 to apply power to drive the above-described first mover 200.

The image sensor (not shown) may be mounted on the center of the upper surface 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. The image sensor converts the optical signal of the object incident through the lens into an electrical signal.

On the other hand, the adhesive described in the present invention may be implemented with a thermosetting epoxy or UV epoxy, and is cured by exposure to heat or UV. However, when a thermosetting epoxy is used, it is a method of curing by moving to an oven or by directly applying heat, and when using UV (ultraviolet) epoxy, it is a method of curing by applying UV (ultraviolet) to the adhesive.

In addition, the adhesive may be an epoxy in which heat curing and UV (ultraviolet) curing can be mixed, and may be both heat curing and UV (ultraviolet) curing, and may be an epoxy that can be cured by selecting one of them. The adhesive is not limited to the epoxy, and may be any material that can be adhered.

As described above, those skilled in the art from the above description will be able to see 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 examples, but claims It should be determined by the scope and its equivalent.

100: cover can 200: first mover
210: bobbin 220: first coil unit
300: second mover 310: magnet part
320: housing 400: stator
500: base 550: seating projection
560: adhesive groove 700: elastic unit
710: upper spring 720: lower spring
730: side spring

Claims (19)

Base;
A housing disposed on the base;
A bobbin disposed in the housing;
A magnet disposed in the housing;
A first coil disposed on the bobbin and facing the magnet;
A substrate disposed on an upper surface of the base; And
It includes a second coil portion which is disposed on the upper surface of the substrate and includes a second coil facing the magnet,
The base includes a hole and a protrusion protruding from the upper surface of the base and extending from the inner circumferential surface of the hole,
Each of the substrate and the second coil portion includes a hole into which the projection portion of the base is inserted,
The substrate includes a groove formed in the inner peripheral surface of the hole of the substrate,
The second coil portion is a lens driving motor including a groove formed on an inner peripheral surface of the hole of the second coil portion and disposed at a position corresponding to the groove of the substrate. According to claim 1,
Each of the grooves of the substrate and the grooves of the second coil part includes a curved surface. According to claim 1,
The groove of the substrate includes four grooves symmetric about the optical axis,
The groove of the second coil portion includes a lens driving motor that includes four grooves that are symmetrical about the optical axis. According to claim 1,
The base is a lens driving motor including a groove formed in the upper surface of the base. According to claim 4,
The groove of the substrate and the groove of the second coil portion is a lens driving motor disposed at a position corresponding to the location of the groove of the base. According to claim 4,
The groove of the base is a lens driving motor spaced apart from the projection of the base. According to claim 1,
A lens driving motor in which an adhesive is disposed in at least one of the groove of the substrate and the groove of the second coil portion. According to claim 1,
A lens driving motor in which a portion of the base is exposed upward through the groove of the substrate and the groove of the second coil portion. According to claim 1,
It is disposed on the lower surface of the substrate and includes a hall sensor for sensing the magnet,
The base is spaced apart from the projection of the base and includes a hall sensor receiving groove formed on the upper surface of the base,
The hall sensor is a lens driving motor disposed in the hall sensor receiving groove of the base. According to claim 1,
An upper spring connecting the upper part of the bobbin and the upper part of the housing;
A lower spring connecting the lower portion of the bobbin and the lower portion of the housing; And
A lens driving motor comprising a cover can of a metallic material that covers the housing and the bobbin and is coupled to the base. The method of claim 10,
The cover can includes a fastening piece that extends to the lower end of the cover can,
The base includes a fastening groove formed on the side of the base,
The fastening piece of the cover can is a lens driving motor disposed in the fastening groove of the base. According to claim 1,
The projection driving part of the base is formed by protruding in a circular shape integrally with the base. According to claim 1,
The lens driving motor including at least two projections formed by protruding the projections at equal intervals of the base. According to claim 4,
Each of the grooves of the substrate and the grooves of the second coil part is formed larger than the grooves of the base. Printed circuit boards;
An image sensor disposed on the printed circuit board;
The lens driving motor of any one of claims 1 to 14 disposed on the printed circuit board; And
A camera module including a lens coupled to the bobbin of the lens driving motor. The method of claim 15,
The substrate includes a body portion disposed between the base and the second coil portion, a first terminal portion extending downward from the first side of the body portion, and a second side opposite to the first side of the body portion. It includes a second terminal portion extending to,
Each of the first terminal portion and the second terminal portion of the substrate is a camera module electrically connected to the printed circuit board. A mobile terminal comprising the camera module of claim 15. Base;
A housing disposed on the base;
A bobbin disposed in the housing;
A magnet disposed in the housing;
A first coil disposed on the bobbin and facing the magnet;
A substrate disposed on an upper surface of the base; And
It includes a second coil portion which is disposed on the upper surface of the substrate and includes a second coil facing the magnet,
The base includes a hole, a protrusion protruding from the upper surface of the base and extending from the inner circumferential surface of the hole, and a groove formed in the upper surface of the base,
Each of the substrate and the second coil portion includes a hole into which the projection portion of the base is inserted,
The second coil portion includes a groove formed in the inner peripheral surface of the hole of the second coil portion
The groove of the base is a lens driving motor formed at a position corresponding to the groove of the second coil portion. Base;
A housing disposed on the base;
A bobbin disposed in the housing;
A magnet disposed in the housing;
A first coil disposed on the bobbin and facing the magnet;
A substrate disposed on an upper surface of the base; And
It includes a second coil portion which is disposed on the upper surface of the substrate and includes a second coil facing the magnet,
The base includes a hole, a protrusion protruding from the upper surface of the base and extending from the inner circumferential surface of the hole, and a groove recessed in the upper surface of the base,
The second coil portion includes a hole into which the projection portion of the base is inserted,
The second coil portion is a lens driving motor including a groove formed on the inner peripheral surface of the hole of the second coil portion at a position adjacent to the projection portion of the base.

Images