KR20200139109A - Lens moving apparatus and camera module including the same - Google Patents

Abstract

An embodiment includes: a housing; a bobbin placed in the housing; a magnet placed in the housing; a coil placed on the bobbin and moving the bobbin in an optical axis direction by interaction with the magnet; and a damping unit placed between the outer surface of the bobbin and the inner surface of the housing. The outer surface of the bobbin faces the inner surface of the housing in a direction perpendicular to the optical axis direction, and at least a part of the coil is placed on the outer surface of the bobbin.

Description

Lens driving device and camera module including the same {LENS MOVING APPARATUS AND CAMERA MODULE INCLUDING THE SAME}

The embodiment relates to a lens driving device and a camera module including the same, and more particularly, to a lens driving device and a camera module that attenuate vibration in the optical axis direction of the bobbin to prevent resonance in the optical axis direction when performing autofocusing. .

In recent years, the development of IT products such as mobile phones, smart phones, tablet PCs, and notebook computers with built-in micro digital cameras is actively progressing.

In the case of a conventional IT product with a built-in micro digital camera, an image sensor that converts external light into a digital image or a digital image and a lens driving device that aligns the focal length of the lens by adjusting the distance between the lenses are built in.

However, in order to perform the autofocus function, conventional micro digital cameras perform a control process of finding the point where the sharpest image is generated on the image sensor based on the sharpness of the digital image formed on the image sensor according to the distance between the lens and the image sensor. It is configured to run. When the auto focus method is executed, the bobbin with the lens mounted moves in the optical axis direction, and when the bobbin moves in the optical axis direction, vibration in the optical axis direction occurs in the bobbin. When the vibration frequency of the bobbin in the direction of the optical axis approaches or coincides with the natural frequency of the bobbin and the housing, a resonance phenomenon occurs between the bobbin and the housing connected to each other by an elastic member, which causes the elastic member to exceed the elastic restoration range. There has been a problem in that the elastic member connecting the bobbin and the housing is damaged when the lifespan of the elastic member is reduced or the resonance phenomenon is severe.

Accordingly, the embodiment provides a lens driving device capable of removing a resonance phenomenon when autofocusing is executed, and a camera module including the same.

In addition, the embodiment provides a lens driving device and a camera module including the same, which more efficiently removes the resonance phenomenon when autofocusing is executed.

In addition, the embodiment provides a lens driving device and a camera module including the same, which prevents a loss of a damping unit during a cleaning process of an assembled lens driving device during a manufacturing process of the lens driving device.

The lens driving apparatus according to the embodiment includes a housing; A bobbin disposed in the housing; A magnet disposed in the housing; A coil disposed on the bobbin and moving the bobbin in the optical axis direction by interaction with the magnet; And a damping part disposed between the outer surface of the bobbin and the inner surface of the housing, wherein the outer surface of the bobbin faces the inner surface of the housing in a direction perpendicular to the optical axis direction, and at least a portion of the coil It is disposed on the outer surface of the bobbin.

The outer surface of the bobbin may include a first attachment region to which the damping part is attached, and the inner surface of the housing may include a second attachment region to which the damping part is attached.

The coil may be disposed below the first attachment area of the bobbin.

The damping unit includes: a first damping unit disposed between a first outer surface of the bobbin and a first inner surface of the housing; A second damping part disposed between the second outer surface of the bobbin and the second inner surface of the housing; A third damping part disposed between the third outer surface of the bobbin and the third inner surface of the housing; And a fourth damping part disposed between the fourth outer surface of the bobbin and the fourth inner surface of the housing.

The lens driving device may include an elastic member coupled to the bobbin and the housing; And a base disposed under the housing.

The elastic member may include two elastic members electrically connected to both ends of the coil. The lens driving device may include a circuit board electrically connected to the two elastic members.

The coil may have a ring shape coupled to an outer surface of the bobbin.

The damping part may be formed of a photocurable resin, and the damping part may be provided in a semi-cured gel state between the bobbin and the housing.

The housing may include four side surfaces, and the magnet may include a driving magnet disposed on each of the four side surfaces of the housing.

In the embodiment, by including a damping part between the bobbin and the housing, vibration of the bobbin in the optical axis direction may be attenuated when autofocusing is executed. Accordingly, in the embodiment, when autofocusing is executed, the resonance phenomenon in the optical axis direction of the lens driving device may be eliminated. As a result, the embodiment can prevent damage and breakage of the upper elastic member and/or the lower elastic member connecting the bobbin and the housing.

In addition, the embodiment may increase the damping area of the damping part by providing a damping connecting part that increases the attachment area of the damping part between the bobbin and the housing, and thus, it is possible to more efficiently remove the resonance phenomenon when autofocusing is executed. , It is possible to improve the adhesion stability of the damping part between the bobbin and the housing.

In addition, in the embodiment, by providing the damping part between the bobbin and the housing, it is possible to prevent the damping part from being exposed to the outside during the cleaning process of the lens driving device assembled during the manufacturing process of the lens driving device, and as a result, the hydraulic pressure of the cleaning liquid during the cleaning process Due to this, it is possible to prevent some or all of the damping parts from being lost.

1 is a schematic perspective view of a lens driving apparatus according to an embodiment.
2 is a schematic exploded perspective view of a lens driving apparatus according to an embodiment.
3 is a schematic perspective view of a lens driving device with a cover member removed from FIG. 1.
4 is a schematic plan view of FIG. 3.
5 is a schematic perspective view of a housing according to an embodiment.
6 is a schematic perspective view of a housing viewed from a different angle from FIG. 5.
7 is a schematic bottom perspective view of a housing according to an embodiment.
8 is a schematic exploded perspective view of a housing according to an embodiment.
9 is a schematic plan view of an upper elastic member according to an embodiment.
10 is a schematic plan view of a lower elastic member according to an embodiment.
11 is a schematic perspective view of a bobbin according to an embodiment.
12 is a schematic bottom perspective view of a bobbin according to an embodiment.
13 is a schematic exploded perspective view of a bobbin according to an exemplary embodiment.
14 is a partially enlarged perspective view of FIG. 13.
15 is a partially enlarged bottom view of FIG. 13.
16 is a schematic partially enlarged perspective view of a receiving groove according to an embodiment.
17 is a schematic longitudinal cross-sectional view of a bobbin according to an embodiment.
18 is a bottom view of a bobbin and a housing according to an embodiment of the present invention.
19 is a schematic longitudinal sectional view of a bobbin, a housing, and a cover member according to an embodiment of the present invention.
20 is a schematic longitudinal sectional view of a bobbin, a housing, and a cover member according to another embodiment.
21 is a schematic longitudinal sectional view of a bobbin and a cover member according to another embodiment.
22 is a schematic bottom view of a bobbin and a housing according to a further embodiment.
23A is a graph of vibration in the optical axis direction of a lens driving apparatus according to the prior art without a damping part.
23B is a graph of vibrations in the optical axis direction of the lens driving apparatus according to the embodiment.
23C is a graph of vibrations in the optical axis direction of the lens driving apparatus when a damping part is lost due to a cleaning process of the lens driving apparatus in the lens driving apparatus according to the embodiment.

Hereinafter, preferred embodiments of the embodiments will be described with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement them. It should be noted that the reference numbers indicated in the configurations in the accompanying drawings use the same reference numbers as much as possible when indicating the same configuration in other drawings. In addition, when it is determined that a detailed description of a related well-known function or a well-known configuration may unnecessarily obscure the subject matter of the embodiment in describing the embodiment, a detailed description thereof will be omitted. In addition, certain features presented in the drawings are enlarged or reduced or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

For reference, in FIGS. 1 to 17, a Cartesian coordinate system (x, y, z) may be used. In the drawing, the x-axis and y-axis refer to a plane perpendicular to the optical axis, and for convenience, the optical axis direction (z-axis direction) may be referred to as a first direction, an x-axis direction as a second direction, and a y-axis direction as a third direction. .

1 is a schematic perspective view of a lens driving apparatus 100 according to an exemplary embodiment, FIG. 2 is a schematic exploded perspective view of a lens driving apparatus 100 according to an exemplary embodiment, and FIG. 3 is FIG. Is a schematic perspective view of the lens driving apparatus 100 with the cover member 300 removed from, FIG. 4 is a schematic plan view of FIG. 3, and FIG. 5 is a schematic perspective view of the housing 140 according to an embodiment of the embodiment 6 is a schematic perspective view of the housing 140 viewed from a different angle from FIG. 5, FIG. 7 is a schematic bottom perspective view of the housing 140 according to an embodiment of the present invention, and FIG. 8 is an embodiment of the embodiment Is a schematic exploded perspective view of the housing 140 according to the embodiment, Figure 9 is a schematic plan view of the upper elastic member 150 according to an embodiment of the embodiment, Figure 10 is a lower elastic member 160 according to an embodiment of the embodiment ) Is a schematic plan view.

The lens driving apparatus 100 according to the embodiment is a device that adjusts a distance between a lens and an image sensor in a camera module so that the image sensor is positioned at a focal length of the lens. That is, the lens driving device 100 is a device that performs an auto-focusing function.

1 to 4, the lens driving apparatus 100 according to the embodiment includes a cover member 300, an upper elastic member 150, a bobbin 110, and a coil provided in the bobbin 110. 120, the housing 140, the driving magnet 130 and the printed circuit board 170 provided in the housing 140, the lower elastic member 160, the base 210, and the optical axis of the bobbin 110 It includes a displacement sensing unit that determines the amount of displacement in the direction (ie, the first direction), and a damping unit serving as an attenuator.

The cover member 300 has a box shape as a whole, and is configured to be coupled to the upper portion of the base 210. The cover member 300 includes an upper elastic member 150, a bobbin 110, a coil 120 provided in the bobbin 110, a housing 140, and the housing in an accommodation space formed together with the base 210 It accommodates the driving magnet 130 and the printed circuit board 170 provided in (140).

The cover member 300 has an opening on an upper surface thereof through which a lens coupled to the bobbin 110 can be exposed to external light. In addition, a window made of a light-transmitting material may be provided in the opening, thereby preventing foreign matter such as dust or moisture from penetrating into the camera module.

The cover member 300 may include a first groove 310 in the lower portion. In this case, as will be described later, the base 210 is formed at a portion that contacts the first groove 310 when the cover member 300 and the base are coupled (that is, a position corresponding to the first groove 310). 2 grooves 211 may be provided. When the cover member 300 and the base are coupled, a concave portion having a predetermined area may be formed through the combination of the first groove 310 and the second groove 211. An adhesive member having a viscosity may be applied to the concave portion. That is, the adhesive member applied to the concave groove fills a gap between the surfaces of the cover member 300 and the base 210 facing each other through the concave groove, so that the cover member 300 becomes the base 210 While being combined with, the space between the cover member 300 and the base 210 may be sealed, and a side surface may be sealed while the cover member and the base are coupled.

In addition, a third groove 320 may be formed on a surface of the cover member 300 corresponding to the terminal surface of the printed circuit board 170 so as not to interfere with a plurality of terminals formed on the terminal surface. The third groove 320 may be formed to be concave on the entire surface facing the terminal surface, and the adhesive member is applied to the inside of the third groove to cover the cover member 300, the base 210, and the printed circuit board ( 170) may be sealed, and a side surface may be sealed while the cover member and the base are coupled.

Meanwhile, the first to third grooves 310 to 320 are formed on the base 210 and the cover member 300, respectively, but are not limited thereto, and are formed only on the base 210 in a similar shape. , It may be configured to be formed only in the cover member 300.

The base 210 may have a rectangular shape as a whole, and is combined with the cover member 300 to form an accommodation space for the bobbin 110 and the housing 140.

A stepped portion protruding a predetermined thickness in an outward direction is provided to surround the lower edge of the base 210. The predetermined thickness of the stepped portion is the same as the side thickness of the cover member 300, and when the cover member 300 is coupled to the base 210, the side surface of the cover member 300 is the upper portion of the stepped portion. Or it may be seated on the side or contacted or disposed or coupled to the side. Accordingly, it is possible to guide the cover member 300 coupled to the upper side of the stepped portion, and further, the end of the cover member 300 may be coupled to face contact, and the end of the cover member has a bottom or side surface. Can include. At this time, the end portions of the stepped portion and the cover member 300 may be adhesively fixed and sealed with an adhesive or the like.

In the stepped portion, a second groove portion 211 may be formed at a position corresponding to the first groove portion 310 of the cover member 300. As described above, the second groove portion 211 is coupled to the first groove portion 310 of the cover member 300 to form a groove portion, and a space in which the adhesive member is filled may be formed.

The base 210 has an opening near the center. The opening is formed at a position corresponding to the position of the image sensor disposed on the camera module.

In addition, the base 210 includes four guide members 216 protruding from four corners at a predetermined height perpendicular to the upper direction. The guide member may have a polygonal column shape. The guide member 216 may be inserted, fastened, or coupled to the lower guide groove 148 of the housing 140 to be described later. In this way, when the housing 140 is seated or disposed above the base 210 due to the guide member 216 and the lower guide groove 148, the housing 140 on the base 210 is coupled. The position may be guided, and at the same time, the housing 140 may be prevented from being separated from the reference position to be mounted due to vibration or the like during the operation of the lens driving device 100 or due to an operator's mistake during the coupling process.

As shown in FIGS. 4 to 9, the housing 140 may have a hollow column shape as a whole (eg, a hollow square column shape as shown in the drawing). The housing 140 is configured to support at least two driving magnets 130 and the printed circuit board 170, and the bobbin 110 is movable in the first direction with respect to the housing 140. It accommodates the bobbin 110.

The housing 140 has four flat sides. A side surface of the housing 140 may be formed in an area corresponding to or larger than that of the driving magnet 130.

As shown in FIG. 9, each of the four side surfaces 141 of the housing 140 facing each other has a through hole 141a or a groove for a magnet in which the driving magnet 130 is seated, placed, or fixed. do. The magnet through hole 141a or the groove may have a size and shape corresponding to the driving magnet 130, and may also have a shape capable of guiding. A first driving magnet 131 and a second driving magnet 132, that is, a total of two driving magnets 130, may be mounted in each of the through holes 141a for the magnets.

And, of the four side surfaces 141 of the housing 140, a through hole for a sensor through which a position detection sensor 180, which will be described later, is inserted, placed, fixed, or seated on one side perpendicular to the both sides or a side other than the both sides. (141b) may be provided. It is preferable that the sensor through-hole 141b has a size and shape corresponding to the position sensor 180 to be described later. In addition, on the one side, at least one mounting protrusion 149 is provided to allow the printed circuit board 170 to be mounted or arranged or temporarily fixed or fixed. The mounting protrusion 149 is inserted into a mounting through hole 173 formed on a printed circuit board 170 to be described later, and the mounting through hole 173 and the mounting protrusion 149 are fitted in shape. It may be said that it is desirable to be combined in a manner or a force fitting method, but it may only function as a simple guide.

Here, among the four side surfaces 141 of the housing 140, the other side facing the one side may be configured as a flat plane, but is not limited thereto.

As a further embodiment of the housing 140, the through holes for the first and second magnets in which the driving magnet 130 is seated, arranged, or fixed on each of the four side surfaces 141 of the housing 140 facing each other (141a) (141a') is provided. And, among the four side surfaces 141 of the housing 140, one side perpendicular to the two sides or a side other than the two side surfaces has a through hole for a third magnet and a through hole for the third magnet for a sensor formed by a predetermined distance. A through hole (141b) may be provided. In addition, a through hole for a fourth magnet may be provided on the other side of the four side surfaces 141 of the housing 140 facing the one side.

That is, four through-holes for magnets and one through-hole 141b for a sensor are provided on the four side surfaces 141 of the housing 140.

At this time, the first magnet through hole (141a) and the second magnet through hole (141a') have the same size and the same shape, and are (almost) the same throughout the lateral length of the side surface of the housing 140. Has a lateral length. On the other hand, the through hole for the third magnet and the through hole for the fourth magnet have the same size and shape, and are more than the first magnet through hole 141a and the second magnet through hole 141a'. The lateral length may be formed to be small. This is to secure a space for the sensor through-hole 141b since the through-hole 141b for the sensor must be formed on one side where the through-hole for the third magnet is formed.

As a matter of course, each of the first through-holes for the first magnet to the through-holes for the fourth magnets 131 to the fourth drive magnets are seated, arranged, or fixed. At this time, likewise, the first driving magnet 131 and the second driving magnet 132 have the same size and shape, and have substantially the same lateral length over the entire lateral length of the side surface of the housing 140 Have. In addition, the third driving magnet and the fourth driving magnet have the same size and shape, and have a lateral length smaller than that of the first driving magnet 131 and the second driving magnet 132. Can be formed.

Here, preferably, the third magnet through hole and the fourth magnet through hole may be symmetrically disposed on a straight line with respect to the center of the housing 140. That is, the third driving magnet 130 and the fourth driving magnet 130 may be symmetrically disposed on a straight line with respect to the center of the housing 140. If the third driving magnet 130 and the fourth driving magnet 130 are arranged opposite to each other while being deflected on one side regardless of the center of the housing 140, the coil 120 of the bobbin 110 This is because there is a possibility that the bobbin 110 may tilt because the electromagnetic force acts to be deflected on one side. In other words, the third driving magnet 130 and the fourth driving magnet 130 are arranged symmetrically on a straight line with respect to the center of the housing 140, so that the bobbin 110 and the coil 120 ), it is possible to apply an unbiased electromagnetic force to the bobbin 110 to guide the movement in the first direction easily and accurately.

In addition, as shown in FIGS. 3 to 6 and 8, a plurality of first stoppers 143 may protrude from the upper surface of the housing 140. The first stopper 143 is to prevent collision between the cover member 300 and the body of the housing 140, and when an external shock occurs, the upper surface of the housing 140 is directly on the upper inner surface of the cover member 300. It can prevent collision. In addition, the first stopper 143 may also serve to guide the installation position of the upper elastic member 150. For this purpose, as shown in FIG. 9, the first stopper 143 of the upper elastic member 150 A guide groove 155 having a corresponding shape may be formed at a position corresponding to the stopper 143.

In addition, a plurality of upper frame support protrusions 144 to which the outer frame 152 of the upper elastic member 150 is coupled may be formed on the upper side of the housing 140. Meanwhile, as will be described later, a first through hole 152a or a groove having a corresponding shape may be formed in the outer frame 152 of the upper elastic member 150 corresponding to the upper frame support protrusion 144, where It may be fixed with an adhesive or fusion bonding, and fusion bonding may include heat bonding or ultrasonic bonding.

In addition, as shown in FIG. 7, a plurality of lower frame support protrusions 147 to which the outer frame 162 of the lower elastic member 160 is coupled may be formed to protrude from the lower side of the housing 140. On the other hand, the outer frame 162 of the lower elastic member 160 corresponding to the lower frame support protrusion 147 may be formed with an insertion groove (162a) or a hole having a corresponding shape, where the adhesive or fusion bonding It may be fixed, and the fusion may include heat fusion or ultrasonic fusion.

The driving magnet 130 may be fixed to the through hole 141a for the magnet with an adhesive, but is not limited thereto, and an adhesive member such as a double-sided tape may be used. Alternatively, as a modified embodiment, instead of the through hole 141a for the magnet, a magnet seating portion having a concave shape may be formed on the inner surface of the housing 140, and the magnet seating portion may correspond to the size and shape of the driving magnet 130 It may have a corresponding size and shape.

The driving magnet 130 may be installed at a position corresponding to the coil 120 provided in the bobbin 110. In addition, the driving magnet 130 may be configured as one body, and in the case of an embodiment, the surface facing the coil 120 of the bobbin 110 may be arranged to be an N pole and an outer surface to be an S pole. . However, it is not limited to this, and it is possible to configure the opposite. In addition, the driving magnet 130 may be divided into two planes perpendicular to the optical axis.

The driving magnet 130 is configured in a rectangular parallelepiped shape having a predetermined width, and is seated in the through hole 141a or the groove for the magnet so that the wide surface of the driving magnet 130 is part of the side surface of the housing 140 Can be formed. In this case, the driving magnets 130 facing each other may be installed parallel to each other. In addition, the driving magnet 130 may be disposed to face the coil 120 of the bobbin 110. In this case, surfaces of the driving magnet 130 and the coil 120 of the bobbin 110 may be disposed in a plane to be parallel to each other. However, this is not limited thereto, and only one of the driving magnet 130 and the coil 120 of the bobbin 110 may be flat, and the other may be configured as a curved surface, depending on the design. Alternatively, the surfaces facing the coil 120 of the bobbin 110 and the driving magnet 130 may be curved, and at this time, the coil 120 of the bobbin 110 and the driving magnet 130 may face each other. The curvature of the surface can be formed the same.

As described above, a sensor through hole (141b) or a groove is provided on one side of the housing (140), and a position detection sensor (180) is inserted, placed, or seated in the sensor through hole (141b), The position detection sensor 180 is electrically coupled to one surface of the printed circuit board 170 by soldering or soldering. In other words, the printed circuit board 170 may be fixed, supported, or disposed on the outer side of the through hole 141b for the sensor or one side of the groove provided among the four side surfaces 141 of the housing.

The position detection sensor 180 may be a displacement detection unit that determines a first displacement value of the bobbin 110 in the first direction together with a sensing magnet 190 of the bobbin 110 to be described later. To this end, the position detection sensor 180 and the sensor through hole 141b or groove are disposed at a position corresponding to the position of the sensing magnet 190.

The position detection sensor 180 may be a sensor that detects a change in magnetic force emitted from the sensing magnet 190 of the bobbin 110. In addition, the position detection sensor 180 may be a Hall sensor. However, this is illustrative, and the embodiment is not limited to the Hall sensor, and any sensor capable of detecting a change in magnetic force may be used, and any sensor capable of detecting a position other than magnetic force may be used, for example , A method using a photo reflector is also possible.

The printed circuit board 170 may be coupled to or disposed on one side of the housing 140 and may include a through hole 173 or a groove for mounting as described above. Accordingly, the installation position of the printed circuit board 170 may be guided by the mounting protrusion 149 provided on one side of the housing 140.

In addition, a plurality of terminals 171 are disposed on the printed circuit board 170 to supply current to the coil 120 and the position detection sensor 180 of the bobbin 110 by receiving external power. The number of terminals 171 formed on the printed circuit board 170 may be increased or decreased according to the type of components requiring control. Meanwhile, according to an embodiment, the printed circuit board 170 may be provided with an FPCB.

The printed circuit board 170 may include a control unit that readjusts the amount of applied current of the coil 120 based on the first displacement value sensed by the displacement detection unit, that is, the control unit is the printed circuit board. It is mounted on (170). In addition, in another embodiment, the control unit may not be mounted on the printed circuit board 170 but may be mounted on a separate substrate, which may be a substrate on which an image sensor of a camera module is mounted, or may be a separate substrate. .

The actuator driving distance may be additionally calibrated based on a difference in Hall voltage with respect to a change in magnet flux (ie, magnetic flux density) detected by the Hall sensor.

The bobbin 110 is configured to reciprocate in the first axial direction with respect to the housing 140 fixed in the first axial direction. The auto focusing function is executed due to the movement of the bobbin 110 in the first axis direction.

The bobbin 110 will be described in more detail below with reference to the drawings.

Meanwhile, the upper elastic member 150 and the lower elastic member 160 may elastically support an upward and/or downward motion of the bobbin 110 in the optical axis direction. The upper elastic member 150 and the lower elastic member 160 may be provided with a leaf spring.

2 to 4, 9 and 10, the upper elastic member 150 and the lower elastic member 160 are inner frames 151, 161 and the housing 140 coupled to the bobbin 110. ) And connecting portions 153 and 163 connecting the outer frames 152 and 162 and the inner frames 151 and 161 to the outer frames 152 and 162.

The connection portions 153 and 163 may be bent at least once to form a pattern having a predetermined shape. The bobbin 110 may be elastically (or elastically) supported by an upward and/or downward motion of the bobbin 110 in the first direction in the optical axis direction through the change in position and fine deformation of the connection parts 153 and 163.

According to an embodiment, as shown in FIG. 9, the upper elastic member 150 includes a plurality of first through holes 152a in the outer frame 152, and a plurality of second through holes in the inner frame 151 ( 151a).

The first through hole (152a) is coupled to the upper frame support protrusion (144) provided on the upper surface of the housing (140), and the second through hole (151a) or groove is on the upper surface of the bobbin (110) to be described later. It is combined with the upper support protrusion provided. That is, the outer frame 152 is fixed and coupled to the housing 140 through the first through hole 152a, and the inner frame 151 is fixed to the bobbin 110 through the second through hole 151a or groove. And are combined.

The connection part 153 connects the inner frame 151 and the outer frame 152 so that the inner frame 151 is elastically deformable in a first direction with respect to the outer frame 152 in a predetermined range.

At least one of the inner frame 151 and the outer frame 152 of the upper elastic member 150 is electrically connected to at least one of the coil 120 and the printed circuit board 170 of the bobbin 110 It may be provided with at least one or more.

As shown in Figure 10, the lower elastic member 160 has a plurality of insertion grooves (162a) or holes in the outer frame 162, and a plurality of third through holes (161a) in the inner frame 161 or It can have a groove.

The insertion groove (162a) or the hole is coupled to the lower frame support protrusion 147 provided on the lower surface of the housing 140, and the third through hole (161a) or the groove is a lower surface of the bobbin 110 to be described later. It is coupled with the lower support protrusion 114 provided in. That is, the outer frame 162 is fixed and coupled to the housing 140 through an insertion groove 162a or a hole, and the inner frame 161 is attached to the bobbin 110 through a third through hole 161a or a groove. Fixed and combined.

The connection part 163 connects the inner frame 161 and the outer frame 162 so that the inner frame 161 is elastically deformable in a first direction with respect to the outer frame 162 in a predetermined range.

The lower elastic member 160 may include a first lower elastic member 160a and a second lower elastic member 160b separated from each other, as shown in FIG. 10. Through this two-part structure, the first lower elastic member 160a and the second lower elastic member 160b may receive power having different polarities or different power sources. That is, after the inner frame 161 and the outer frame 162 are coupled to the bobbin 110 and the housing 140, respectively, the inner frame corresponding to both ends of the coil 120 disposed on the bobbin 110 By providing a solder part at the position of, conductive connection such as soldering or the like is performed in the solder part to receive power having different polarities or different power sources. In addition, the first lower elastic member is electrically connected to one of both ends of the coil, and the other of the both ends of the coil and the second lower elastic member are electrically connected to apply current and/or voltage from the outside. I can receive it.

Meanwhile, the upper elastic member 150 and the lower elastic member 160, the bobbin 110, and the housing 140 may be assembled through heat fusion and/or bonding using an adhesive or the like. At this time, the fixing operation may be completed by bonding using an adhesive after heat fusion fixing according to the assembly sequence.

As a modified embodiment, the upper elastic member 150 may be configured as a two-part structure, and the lower elastic member 160 may be configured as an integral structure.

At least one of the inner frame 161 and the outer frame 162 of the lower elastic member 160 has a terminal portion electrically connected to at least one of the coil 120 and the printed circuit board 170 of the bobbin 110 At least one or more may be provided.

The damping unit acts as an attenuator for absorbing vibrations in the direction of the optical axis generated during the auto focusing operation of the lens driving device. The damping unit is provided between a fixed body fixed at an original position without moving during the auto-focusing operation of the lens driving device and a moving body moving in the optical axis direction during the auto-focusing operation of the lens driving device. The fixed body may be, for example, a cover member, a housing, a base, and the like, and the moving body may be a bobbin or a lens.

Preferably, as will be described later, the damping part may be provided between the bobbin and the housing.

In this case, the bobbin and the housing have a damping connection part to form an accommodation space for accommodating the damping part or an attachment region to which the damping part is attached. That is, the damping connection part is formed of a part of the bobbin and a part of the housing.

The damping part and the damping connection part according to the present invention will be described in more detail below with reference to the drawings.

* FIG. 11 is a schematic perspective view of the bobbin 110 according to an embodiment, FIG. 12 is a schematic bottom perspective view of the bobbin 110 according to an embodiment of the embodiment, and FIG. 13 is an embodiment of the embodiment Is a schematic exploded perspective view of the bobbin 110 according to, FIG. 14 is a partially enlarged perspective view of FIG. 13, FIG. 15 is a partially enlarged bottom view of FIG. 13, and FIG. 16 is a receiving groove 117 according to an embodiment of the embodiment. ) Is a schematic partially enlarged perspective view, and FIG. 17 is a schematic longitudinal sectional view of the bobbin 110 according to an embodiment of the embodiment.

11 to 17, the bobbin 110 may be installed in the inner space of the housing 140 to reciprocate in the optical axis direction. A coil 120, which will be described later, is installed on the outer circumferential surface of the bobbin 110 to allow electromagnetic interaction with the driving magnet 130 of the housing 140, so that the electrons of the coil 120 and the driving magnet 130 The bobbin 110 may reciprocate in the first direction due to the miraculous interaction. In addition, the bobbin 110 is elastically (or elastically) supported by the upper elastic member 150 and the lower elastic member 160, and moves in the first direction, which is the optical axis direction, to perform an auto-focusing function. .

The bobbin 110 is not shown, but may include a lens barrel (not shown) in which at least one lens is installed, but the lens barrel is a component of a camera module to be described later and is an essential component of the lens driving device. It may not be an element. The lens barrel can be coupled to the inside of the bobbin 110 in various ways. For example, a female thread is formed on the inner circumferential surface of the bobbin 110 and a male thread corresponding to the thread is formed on the outer circumferential surface of the lens barrel, and the lens barrel can be coupled to the bobbin 110 by screwing them. However, this is not limited thereto, and the lens barrel may be directly fixed to the inside of the bobbin 110 by a method other than screwing without forming a thread on the inner circumferential surface of the bobbin 110. Alternatively, the one or more lenses may be integrally formed with the bobbin 110 without a lens barrel. The lens coupled to the lens barrel may be configured as a single sheet, or two or more lenses may be configured to form an optical system.

In addition, a plurality of upper and lower support protrusions 113 and a plurality of lower support protrusions 114 may protrude on upper and lower surfaces of the bobbin 110.

The upper support protrusion may be provided in a cylindrical or prismatic shape, as shown in FIG. 11, and may couple and fix the inner frame 151 and the bobbin 110 of the upper elastic member 150. According to an embodiment, a second through hole 151a or a groove may be formed at a position corresponding to the upper support protrusion of the inner frame 151 of the upper elastic member 150. At this time, the upper support protrusion and the second through hole 151a or the groove may be fixed by thermal fusion, or may be fixed with an adhesive member such as epoxy. In addition, a plurality of upper support protrusions may be provided. At this time, the distance between each of the upper support protrusions may be appropriately arranged within a range that can avoid interference with surrounding parts. That is, the upper support protrusions may be arranged symmetrically with respect to the center of the bobbin 110 at regular intervals, and the intervals thereof are not constant, but symmetrical with respect to a specific virtual line passing through the center of the bobbin 110 It can also be formed.

As shown in FIG. 12, the lower support protrusion 114 may be provided in a cylindrical shape or a prismatic shape like the upper support protrusion described above, and includes the inner frame 161 and the bobbin 110 of the lower elastic member 160 Can be combined and fixed. According to an embodiment, a third through hole 161a or a groove may be formed at a position corresponding to the lower support protrusion 114 of the inner frame 161 of the lower elastic member 160. At this time, the lower support protrusion 114 and the third through hole 161a or groove may be fixed by thermal fusion, or may be fixed with an adhesive member such as epoxy. In addition, a plurality of lower support protrusions 114 as shown in FIG. 12 may be provided. In this case, the distance between each of the lower support protrusions 114 may be appropriately arranged within a range that can avoid interference with surrounding components. That is, each of the lower support protrusions 114 may be arranged symmetrically with respect to the center of the bobbin 110 at regular intervals.

In addition, on the upper and lower surfaces of the bobbin 110, the upper escape groove 112 and the upper escape groove 112 at positions corresponding to the connection part 153 of the upper elastic member 150 and the connection part 163 of the lower elastic member 160 The lower escape groove 118 is formed.

When the upper escape groove 112 and the lower escape groove 118 are provided, when the bobbin 110 moves in the first direction with respect to the housing 140, the connection portions 153 and 163 and the bobbin 110 are By removing spatial interference, the elastic deformation of the connection portions 153 and 163 may be more easily performed. In addition, the position of the upper escape groove may be disposed at the edge of the housing as in the embodiment, but may be disposed on the side according to the shape and/or position of the connecting portion of the elastic member.

In addition, a seating groove 116 for a coil in which the coil 120 is installed may be provided on the outer circumferential surface of the bobbin 110, but only a seating portion may be provided.

The coil 120 may be provided as an outer circumferential surface of the bobbin 110 or a ring-shaped coil block inserted and coupled to the seating groove 116 for the coil or the seating portion, but is not limited thereto. It may be directly wound on the outer circumferential surface of the bobbin 110 or the seating groove 116 or seating portion for the coil.

According to an embodiment, the coil 120 may be formed in an approximately octagonal shape as shown in FIG. 13. This corresponds to the shape of the outer peripheral surface of the bobbin 110, and the bobbin 110 may also be provided in an octagonal shape. Further, at least four surfaces of the coil 120 may be formed in a straight line, and a corner portion connecting these surfaces may be formed in a round or straight line. In this case, the portion formed in a straight line may be formed to be a surface corresponding to the driving magnet 130. In addition, a surface of the driving magnet 130 corresponding to the coil 120 may have a curvature equal to that of the coil 120. That is, if the coil 120 is straight, the surface of the corresponding driving magnet 130 may be a straight line, and if the coil 120 is curved, the surface of the corresponding driving magnet 130 may be curved. And may have the same curvature. In addition, even if the coil 120 is curved, the surface of the corresponding driving magnet 130 may be straight or vice versa.

The coil 120 is for moving the bobbin 110 in the direction of the optical axis to perform an autofocus function, and when current is supplied, an electromagnetic force can be formed through electromagnetic interaction with the driving magnet 130. The electromagnetic force can move the bobbin 110.

On the other hand, the coil 120 may be configured to correspond to the driving magnet 130, and as shown, the driving magnet 130 is composed of a single body so that the entire surface facing the coil 120 has the same polarity. When provided to have a, the coil 120 may also be configured such that a surface corresponding to the driving magnet 130 has the same polarity. On the other hand, although not shown, if the driving magnet 130 is divided into two planes perpendicular to the optical axis and the surface facing the coil 120 is divided into two or more, the coil 120 is also divided. It is also possible to be divided into a number corresponding to the driving magnet 130.

Further, the bobbin 110 includes a sensing magnet 190 included in the displacement sensing unit together with the position sensing sensor 180 of the housing 140 described above. The sensing magnet 190 is fixed, arranged, or coupled to the bobbin 110. Accordingly, the sensing magnet 190 may move in the first direction by the same amount of displacement as the bobbin 110 when the bobbin 110 moves in the first direction. In addition, the sensing magnet 190 may be configured as one body, and the upper direction of the bobbin 110 may be an N pole, and the lower direction of the bobbin 110 may be an S pole. However, it is not limited to this, and it is possible to configure the opposite. In addition, the sensing magnet 190 may be divided into two planes perpendicular to the optical axis.

Here, as shown in FIGS. 13 to 17, the bobbin 110 may include a receiving groove 117 for accommodating the sensing magnet 190 on the outer circumferential surface of the bobbin 110.

The receiving groove 117 may be formed from an outer surface of the bobbin 110 to an inner direction of the bobbin 110 to a predetermined depth.

Specifically, the receiving groove 117 is formed on one side of the bobbin 110 so that at least a portion of the receiving groove 117 is located inside the coil 120. In addition, at least a portion of the receiving groove 117 may be formed to be concave in a predetermined depth toward the inside of the bobbin 110 more than the coil seating groove 116. In this way, by forming the receiving groove 117 in the inner direction of the bobbin 110, the sensing magnet 190 can be accommodated in the bobbin 110, and thus a separate for the sensing magnet 190 Since there is no need to secure an installation space, space efficiency of the bobbin 110 can be improved.

In particular, the receiving groove 117 is disposed at a position corresponding to the position of the position detecting sensor 180 of the housing 140 (or a position facing the position detecting sensor 180). For this reason, the distance between the sensing magnet 190 and the position sensing sensor 180 is the thickness of the coil 120 and the separation distance between the coil 120 and the position sensing sensor 180 or the coil and the position sensing sensor Since the distance between them can be further included and minimized to the distance, the magnetic force detection accuracy of the position detection sensor 180 can be improved.

The receiving groove 117 has an opening 119 communicating with the receiving groove 117 on one of a lower surface and an upper surface of the bobbin 110. For example, as shown in FIG. 17, the receiving groove 117 is partially opened to form an opening 119 of the lower surface of the bobbin 110, and the opening 119 is the receiving groove 117 Can form the entrance of. The sensing magnet 190 may be inserted, disposed, or fixed through the opening 119, and may be separated through it.

More specifically, as shown in Figs. 15 to 17, the receiving groove 117 is a predetermined inner surface to which one surface of the sensing magnet 190 is supported, and the inner surface so that an adhesive can be injected. It may include an adhesive groove (117b) formed to be concave deeper inward.

The inner surface is a surface located in an inward direction toward the center of the bobbin 110, and when the sensing magnet 190 has a rectangular parallelepiped shape, a surface on which the wide surface of the sensing magnet 190 is in contact or seated to be.

The bonding groove 117b may be a groove formed such that a portion of the inner surface is deeply concave in an inner direction toward the center of the bobbin 110. The adhesive groove 117b is preferably formed from the opening 119 to the inner surface of the bobbin 110 on which one surface of the sensing magnet 190 is in contact, seated or disposed.

As shown in FIG. 17, the adhesive groove 117b further includes a first additional groove 117c formed longer than the length of the sensing magnet 190 in the vertical thickness direction of the bobbin 110. . That is, the first additional groove 117c is an extension of the bonding groove 117b formed to be deeper than the inner surface of the bobbin 110 on which the rear surface of the sensing magnet 190 is in contact, seated or disposed to be. By providing the first additional groove (117c), when the adhesive is injected into the adhesive groove (117b) through the opening (119), the adhesive is filled from the first additional groove (117c) and the inside of the adhesive groove (117b) Since it is filled, since the adhesive overflows in the adhesive groove 117b and flows to the coil 120 along the gap between the sensing magnet 190 and the receiving groove 117, the sensing magnet 190 ) During the coupling process, it is possible to reduce the incidence of defects in the lens driving apparatus 100.

In addition, the bonding groove 117b further includes a second additional groove 117a formed in a predetermined depth from the opening 119 toward the center of the bobbin 110. That is, the second additional groove 117a is formed deeper in the inner direction toward the center of the bobbin 110 than the inner surface near the opening 119. The second additional groove 117a is in communication with the bonding groove 117b. In other words, the second additional groove 117a is an extension of the bonding groove 117b. In this way, by providing the second additional groove 117a, the adhesive can be injected into the adhesive groove 117b through the second additional groove 117a, so that the adhesive overflows near the opening 119 and the coil ( Since adhesion to other components of the bobbin 110 such as 120) can be prevented, the occurrence rate of defects in the lens driving device 100 during the coupling process of the sensing magnet 190 can be reduced.

In addition, as a modified embodiment, the second additional groove 117a may be provided in the bobbin 110 alone without an adhesive groove 117b. In this case, the adhesive may be injected into the second additional groove 117a to couple and fix the bobbin 110 and the sensing magnet 190.

Preferably, the adhesive groove 117b may include at least one of the first additional groove 117c and the second additional groove 117a. That is, the adhesive groove 117b may have only the first additional groove 117c or only the second additional groove 117a.

As a modified embodiment, the receiving groove has a depth between the inner surface on which one surface (ie, wide surface) of the sensing magnet is supported and the outer circumferential surface (ie, the surface of the coil seating groove) on which the coil is provided It may be less than the thickness of the dragon magnet. For this reason, the sensing magnet may be fixed in the receiving groove by an inner pressing force of the coil due to winding of the coil. In this case, there is no need to use an adhesive.

As a further embodiment, although not shown in the drawing, the bobbin 110 is symmetrical with the receiving groove 117 based on the center of the bobbin 110 on an outer circumferential surface facing the outer circumferential surface in which the receiving groove 117 is formed. An additional receiving groove 117 formed on the outer circumferential surface of the bobbin 110 and a weight balancing member accommodated in the additional receiving groove 117 may be further included.

That is, the additional receiving groove 117 is a predetermined depth bobbin at a position symmetrical with the receiving groove 117 on the basis of the center of the bobbin 110 on the outer circumferential surface facing the outer circumferential surface where the receiving groove 117 is formed. It is formed in the inward direction of (110). In addition, the weight balance member is fixed and coupled in the additional receiving groove 117, and has the same weight as the magnetic force sensing member.

In this way, by providing the additional receiving groove 117 and the weight balancing member, the horizontal weight imbalance of the bobbin 110 due to the provision of the receiving groove 117 and the sensing magnet 190 is reduced by the mounting of the weight balancing member. You can compensate.

Preferably, the additional receiving groove 117 may include at least one of the bonding groove 117b, the first additional groove 117c, and the second additional groove 117a.

18 is a bottom view of the bobbin 110 and the housing 140 according to an embodiment of the present invention, and FIG. 19 is a view of the bobbin 110, the housing 140, and the cover member 300 according to an embodiment of the embodiment. Fig. 20 is a schematic longitudinal sectional view, and Fig. 20 is a schematic longitudinal sectional view of the bobbin 110, the housing 140, and the cover member 300 according to another embodiment of the embodiment, and Fig. 21 is a further embodiment of the embodiment. It is a schematic longitudinal cross-sectional view of the bobbin 110 and the cover member 300 according to this.

As shown in FIG. 18, a damping part 410 is provided between the housing 140 and the bobbin 110. However, the embodiment is not limited thereto, and the damping part 410 may be provided between the moving body and the fixed body of the lens driving apparatus 100 according to the embodiment as described above.

The damping unit 410 serves to attenuate vibrations in the first direction (ie, the optical axis direction) due to electromagnetic interaction between the driving magnet 130 and the coil 120.

The damping part 410 is provided in the bobbin 110 and the housing 140 so that the bobbin 110 can flow in the first direction relative to the housing 140 in a predetermined range.

To this end, the damping part 410 is made of a photocurable resin. Preferably, the damping part 410 may be made of a UV-curable resin, and more preferably the damping part 410 may be made of a UV-curable silicone.

In order to allow the bobbin 110 to flow in the optical axis direction in a predetermined range without being completely fixed to the housing 140, the damping part 410 is provided in a semi-cured gel state.

Here, in the semi-curing process of the damping part 410, the space between the bobbin 110 and the housing 140 (that is, the space provided with the damping part 410 and the damping part 410) is light (or UV). It is carried out by exposing it for a certain time.

In addition, a plurality of damping parts 410 are provided between the housing 140 and the bobbin 110. In this case, preferably, the plurality of damping parts 410 may be disposed to be spaced apart at the same angle in the circumferential direction of the housing 140 and the bobbin 110. This is because the vibration in the optical axis direction generated by the movement of the bobbin 110 is uniformly absorbed around the bobbin 110 during the auto-focusing operation of the lens driving device 100, so that the vibration in the optical axis direction of the bobbin 110 is in one direction. This is to prevent being biased.

In addition, preferably, when an even number of the plurality of damping parts 410 are provided, the plurality of damping parts 410 may be disposed to be opposed to each other by pair between the bobbin 110 and the housing 140. I can.

The bobbin 110 and the housing 140 include a damping connection part 420. In other words, the four-wing damping connection part 420 is composed of a part of the bobbin 110 and a part of the housing 140.

The damping connection part 420 is configured to increase the attachment area of the damping part 410 in order to increase the damping area of the damping part 410.

In addition, the damping connection part 420 is configured so that the damping part 410 can be safely received or fixed between the bobbin 110 and the housing 140. This is because the damping part 410 is in a liquid or semi-liquid state before going through the semi-curing process, so when the damping part 410 is injected between the bobbin 110 and the housing 140, the damping part 410 is the bobbin 110 This is because it is difficult to be maintained at a predetermined position between the and the housing 140.

The damping connection part 420 is configured such that a part of the bobbin 110 and a part of the housing 140 overlap each other in a predetermined range based on a plan view of the lens driving device 100.

Specifically, the damping connection part 420 includes a damping protrusion 421 provided on one of the bobbin 110 and the housing 140, and one of the bobbin 110 and the housing 140 It includes a damping receiving groove 423 provided in the other member.

That is, the damping protrusion 421 may be provided in the bobbin 110 and the damping receiving groove 423 may be provided in the housing 140, or the damping protrusion 421 may be provided in the housing ( 140 and the damping receiving groove 423 may be provided in the bobbin 110.

Hereinafter, for clarity of explanation, if the damping protrusion 421 is provided in the bobbin 110 and the damping receiving groove 423 is provided in the housing 140 as shown in the drawing It will be described based on.

A plurality of damping protrusions 421 are provided on opposite surfaces of the bobbin 110 and the housing 140 in one member of the bobbin 110 and the housing 140. That is, the bobbin 110 and the housing 140 have opposite surfaces facing each other, and the opposite surface belonging to the bobbin 110 is a first facing surface P1, and the opposite surface belonging to the housing 140 is formed. When the surface is referred to as the second facing surface P2, the damping protrusion 421 is provided on the first facing surface P1 as shown in FIGS. 18 to 21. Of course, when the damping protrusion 421 is provided in the housing 140, the damping protrusion 421 may be provided on the second opposing surface P2.

The damping protrusion 421 protrudes in a horizontal direction by a predetermined length from the first facing surface P1 of the bobbin 110 toward the housing 140 or the second facing surface P2. Preferably, the damping protrusion 421 may have a plate-shaped member shape as a whole.

The damping protrusion 421 has a predetermined thickness, and the damping protrusion 421 is configured such that a predetermined thickness of the damping protrusion 421 is smaller than the height of the damping receiving groove 423 to be described later.

The damping receiving groove 423 is provided in a plurality of positions corresponding to the position of the damping protrusion 421 on the second facing surface P2 of the housing 140.

The damping receiving groove 423 is formed to be concave to accommodate a part of the damping protrusion 421 and the damping part 410 on the second facing surface P2. That is, the damping receiving groove 423 is formed to be concave in an outward direction away from the center of the housing 140 on the second facing surface P2 of the housing 140.

Further, the damping receiving groove 423 has a predetermined width (ie, a horizontal length in a horizontal direction) and a predetermined height (ie, a vertical length in a vertical direction). At this time, the damping receiving groove 423 has a predetermined width of the damping receiving groove 423 larger than the width of the damping protruding portion 421 and a predetermined height of the damping receiving groove 423 It is configured to be larger than a predetermined thickness of the damping protrusion 421.

In other words, the damping receiving groove 423 and the damping protruding part 421 are arranged so that the opposite surfaces of the damping receiving groove 423 and the damping protruding part 421 facing each other are separated by a predetermined distance. It is provided in the bobbin 110 and the housing 140. In addition, the damping part 410 is provided, attached, or filled in a receiving space in which facing surfaces of the damping receiving groove 423 and the damping protruding part 421 facing each other are spaced apart by a predetermined distance.

The damping receiving groove 423 includes a stepped portion 423a defined from an upper portion or a lower portion to an inner surface of the housing 140. For example, when the damping receiving groove 423 is provided in the lower portion of the housing 140, the stepped portion 423a may include a lower surface of the housing 140 among inner surfaces of the housing 140 It is formed in parallel. To the same effect, when the damping receiving groove 423 is provided on the upper portion of the housing 140, the stepped portion 423a is formed with the upper surface of the housing 140 among the inner surfaces of the housing 140. It is formed in parallel. Due to this stepped portion 423a, the damping portion 410 before the semi-curing process can be maintained at a predetermined position in the damping receiving groove 423 of the housing 140, and thus the position of the damping portion 410 As the operator can stably maintain the desired position, the final forming process (ie, semi-curing process) of the damping unit 410 can be facilitated.

The damping part 410 is attached or received in the damping receiving groove 423 so as to surround the entire outer surface of a part of the damping protrusion 421 with a predetermined thickness. That is, the damping part 410 includes upper and lower surfaces, front and both sides of a part of the damping protrusion 421 accommodated in the damping receiving groove 423, and the stepped part of the damping receiving groove 423 ( 423a), both side surfaces, and the opposite surface of the front surface of the damping protrusion 421 are provided to surround all surfaces.

As shown in FIG. 18, the damping part 410, the damping protrusion 421, and the damping receiving groove 423 are provided with the bobbin 110 in the bobbin 110 and the housing 140. The housing 140 is provided at the corners of opposite surfaces. In this case, each of the plurality of driving magnets 130 is seated, disposed, or fixed to each of the second facing surfaces P2 of the housing 140. That is, the damping part 410, the damping protrusion 421, and the damping receiving groove 423 are provided on a surface that does not overlap a surface on which the plurality of driving magnets 130 are seated.

19 to 21, the damping part 410, the damping protrusion 421, and the damping receiving groove 423 are provided with the bobbin 110 and the housing 140 in the bobbin 110 and the housing 140. Various embodiments are shown in which the housing 140 is provided according to the height at the corners of the facing surfaces.

First, as shown in FIG. 19, according to an exemplary embodiment, the damping protrusion 421 is provided under the bobbin 110, and the damping receiving groove 423 is the housing 140 ) From the open lower end (ie, the start of the damping receiving groove 423) to a predetermined height higher than the damping protrusion.

That is, in the damping protrusion 421 and the damping receiving groove 423, the stepped portion 423a of the damping receiving groove 423 is positioned at a predetermined height higher than the upper surface of the damping protrusion 421. It is provided to be formed.

In this situation, when the assembly process of the lens driving device 100 is completed, the open lower end of the housing 140 and the damping part 410 may be disposed under the housing 140 and/or the bobbin 110. It is sealed by the upper surface of the base 210 coupled to. That is, the damping part 410 is blocked from being exposed to the outside by the upper surface of the base 210.

Therefore, since the cleaning process of the lens driving device 100 is executed in a state in which the exposure of the damping part 410 to the outside is blocked by the base 210, the hydraulic pressure of the cleaning liquid will affect the damping part 410. Therefore, loss or loss of the damping part 410 due to the cleaning process of the lens driving device 100 can be reliably prevented.

And, as shown in Figure 20, according to another embodiment of the embodiment, the damping protrusion 421 is provided on the upper portion of the bobbin 110, the damping receiving groove 423 is the housing ( 140) from the open upper end (ie, the start of the damping receiving groove 423) is formed to be lower than the damping protrusion by a predetermined height.

That is, in the damping protrusion 421 and the damping receiving groove 423, the stepped part 423a of the damping receiving groove 423 is at a position lower than the lower surface of the damping protrusion 421 by a predetermined height. It is provided to be formed.

In this situation, when the assembly process of the lens driving device 100 is completed, the open upper end of the housing 140 and the damping part 410 may be formed on the upper part of the housing 140 and/or the bobbin 110. It is sealed by the upper surface (ie, the inner surface of the upper surface) of the cover member 300 coupled to. That is, the damping part 410 is blocked from being exposed to the outside by the upper surface of the cover member 300.

Therefore, since the cleaning process of the lens driving device 100 is executed in a state in which the exposure of the damping part 410 to the outside is blocked by the cover member 300, the hydraulic pressure of the cleaning liquid affects the damping part 410. Since it is impossible to go crazy, loss or loss of the damping part 410 due to the cleaning process of the lens driving apparatus 100 can be reliably prevented.

In addition, as shown in FIG. 21, according to another embodiment of the embodiment, the damping protrusion 421 has an intermediate height of the bobbin 110 at the first facing surface P1 of the bobbin 110. The damping receiving groove 423 is formed at a predetermined height higher than the damping protrusion from the open lower end of the housing 140.

In this case, the driving coil 120 provided in the bobbin 110 is preferably wound up and down the damping protrusion 421 to avoid the damping protrusion 421.

And, in this case, since the damping part 410 is disposed deeply from the bobbin 110 and the housing 140 with respect to the lower part of the bobbin 110 and the housing 140, the base 210 Even if the cleaning process of the lens driving device 100 is performed in a state in which the open lower end and the damping part 410 are not sealed, the hydraulic pressure of the cleaning liquid is hardly affected. That is, according to the embodiment, even if the cleaning process is performed before the base 210 and the housing 140 and/or the bobbin 110 are combined, there is no risk of loss of the damping part 410.

Although not shown in the drawing, as a modified embodiment of another embodiment of the embodiment, the damping protrusion 421 is provided at an intermediate height of the bobbin 110 at the first facing surface P1 of the bobbin 110 And, it may be formed lower than a predetermined height than the protrusion for the dam pim from the open upper end of the housing 140.

In this case as well, similar to another embodiment of the above-described embodiment, the lens driving apparatus 100 in a state where the open upper end and the damping part 410 by the cover member 300 are not sealed. Even if the cleaning process is performed, it is hardly affected by the hydraulic pressure of the cleaning liquid. That is, according to the embodiment, there is no risk of loss of the damping unit 410 even if the cleaning process is performed before the cover member 300 is coupled with the housing 140 and/or the bobbin 110.

22 is a schematic bottom view of the bobbin 110 and the housing 140 according to a further embodiment of the embodiment.

As shown in FIG. 22, the damping protrusion 421 and the damping receiving groove 423 include the bobbin 110 and the housing 140 in the bobbin 110 and the housing 140. It may not be provided on the corners of the opposed surfaces, but may be provided on the opposite surfaces.

In this case, each of the plurality of driving magnets 130 is seated, disposed, or fixed to each of the corner surfaces of the second facing surfaces P2 of the housing 140. That is, the damping part 410, the damping protrusion 421, and the damping receiving groove 423 are provided on a surface that does not overlap a surface on which the plurality of driving magnets 130 are seated. However, the embodiment is not limited to the above-described position with respect to the positional relationship between the driving magnet 130 and the damping unit 410.

Even in the case of the embodiment, as described above with respect to FIGS. 19 to 21, the damping part 410, the damping protrusion 421, and the damping receiving groove 423 are provided with the bobbin 110 and the housing ( In 140), the mounting positions according to the height on the opposite surfaces of the bobbin 110 and the housing 140 may be implemented in various embodiments.

23A is a graph of vibration in the optical axis direction of the lens driving apparatus 100 according to the prior art without a damping unit 410, and FIG. 23B is a graph of vibration in the optical axis direction of the lens driving apparatus 100 according to the embodiment. 23C is a graph of vibrations in the optical axis direction of the lens driving device 100 when the damping part 410 is lost by the cleaning process of the lens driving device 100 in the lens driving device 100 according to the embodiment.

When the damping unit 410 for the auto-focusing operation of the lens driving device 100 is not provided, as shown in the result graph of the vibration experiment during the auto-focusing operation of the lens driving device 100 shown in FIG. 23A, It can be seen that a resonance point or a resonance section where the amplitude is maximized (refer to the red circle mark) occurs.

On the contrary, as in the embodiment, when the damping unit 410 for the auto-focusing operation of the lens driving device 100 is provided, the result graph of the vibration experiment during the auto-focusing operation of the lens driving device 100 shown in FIG. 23B As shown in FIG. 23A, it can be seen that the resonance point or the resonance section shown in the graph as a result of the vibration experiment during the auto focusing operation of the lens driving apparatus 100 shown in FIG. 23A is removed.

However, even in the lens driving device 100 provided with the damping part 410, when the cleaning process of the lens driving device 100 is executed for the lens driving device 100, the damping part 410 is As a result of the vibration experiment during the auto-focusing operation of the lens driving apparatus 100 shown in FIG. 23C, a case where part or all of the loss is frequently occurs, as shown in the result graph, the resonance point or the resonance section at which the amplitude is maximized. You can see that (refer to the red circle mark) occurs again.

In this embodiment, in order to prevent the re-occurrence of the resonance point or the resonance section due to the loss or loss of the damping unit 410 due to the cleaning process, a damping connection unit for safely receiving, arranging, or fixing the damping unit 410 as described above. (420), and the damping part 410 and the damping connection part 420 are closed by the base 210 and/or the cover member 300 to the outside during the cleaning process. Avoid exposure.

As described above, the embodiment includes a damping unit between the bobbin and the housing, so that vibration of the bobbin in the optical axis direction can be attenuated when autofocusing is executed. Accordingly, in the embodiment, when autofocusing is executed, the resonance phenomenon in the optical axis direction of the lens driving device may be eliminated. As a result, according to the embodiment, damage or breakage of the upper elastic member and/or the lower elastic member connecting the bobbin and the housing can be prevented.

In addition, the embodiment may increase the damping area of the damping part by providing a damping connecting part that increases the attachment area of the damping part between the bobbin and the housing, and thus, the resonance phenomenon during autofocusing can be more efficiently removed. In addition, it is possible to improve the adhesion stability of the damping part between the bobbin and the housing.

In addition, in the embodiment, by providing the damping part between the bobbin and the housing, it is possible to prevent the damping part from being exposed to the outside during the cleaning process of the assembled lens driving device during the manufacturing process of the lens driving device. It is possible to prevent some or all of the damping parts from being lost due to hydraulic pressure.

In addition, a lens may be coupled to the lens driving device according to the embodiment, and a camera module may be further provided, including a printed circuit board on which an image sensor and an image sensor are disposed, and a base of the lens driving device and the image sensor are disposed. It can be combined with the printed circuit board.

In addition, the camera module may further include a camera module control unit, and a first displacement value calculated based on a current change value detected by the displacement detection unit is compared with a focal length of the lens according to the distance between the subject and the lens. do. Thereafter, the camera module controller readjusts the amount of current applied to the coil 120 of the bobbin 110 when the first displacement value or the current position of the lens and the focal length of the lens do not correspond to each other, and the bobbin 110 May be moved in the first direction by a second displacement amount. In addition, the displacement detection unit is for the sensing according to the movement of the first direction of the sensing magnet 190 fixedly coupled to the bobbin 110, the position detection sensor 180 is fixed to the fixed housing 140 The current position or the first displacement amount of the bobbin 110 from a separate driver IC or the camera module control unit based on the current change amount output based on the change amount of the detected magnetic force by detecting the change of the magnetic force emitted from the magnet 190 Can be calculated or judged. The current position or the first displacement amount of the bobbin 110 calculated or determined by the displacement detection unit is transmitted to the control unit of the printed circuit board 170 so that the control unit re-determines the position of the bobbin 110 for autofocusing, 120) applied current amount.

In the above, to illustrate the technical idea of the embodiment, it has been shown and described as a specific embodiment, but the embodiment is not limited to the same configuration and operation as the specific embodiment as described above, and various modifications are carried out within the limit not departing from the scope of the embodiment. Can be. Therefore, such modifications should be regarded as belonging to the scope of the embodiment, and the scope of the embodiment should be determined by the claims to be described later.

Claims (10)

housing;
A bobbin disposed in the housing;
A magnet disposed in the housing;
A coil disposed on the bobbin and moving the bobbin in the optical axis direction by interaction with the magnet;
A damping part disposed between the outer surface of the bobbin and the inner surface of the housing,
In a direction perpendicular to the optical axis direction, the outer surface of the bobbin faces the inner surface of the housing, and at least a part of the coil is disposed on the outer surface of the bobbin. The method of claim 1,
And a first attachment area to which the damping part is attached to the outer surface of the bobbin, and a second attachment area to which the damping part is attached to the inner surface of the housing. The method of claim 2,
The lens driving device is disposed below the first attachment region of the bobbin. The method of claim 1,
The damping part,
A first damping part disposed between the first outer surface of the bobbin and the first inner surface of the housing;
A second damping part disposed between the second outer surface of the bobbin and the second inner surface of the housing;
A third damping part disposed between the third outer surface of the bobbin and the third inner surface of the housing; And
A lens driving device comprising a fourth damping part disposed between the fourth outer surface of the bobbin and the fourth inner surface of the housing. The method of claim 1,
An elastic member coupled to the bobbin and the housing; And
Lens driving apparatus including a base disposed under the housing. The method of claim 5,
The elastic member is a lens driving device including two elastic members electrically connected to both ends of the coil. The method of claim 6,
A lens driving apparatus comprising a circuit board electrically connected to the two elastic members. The method of claim 1,
The coil is a lens driving device having a ring shape coupled to the outer surface of the bobbin. The method of claim 1,
The damping part is formed of a photocurable resin,
The lens driving device is provided in a semi-cured gel state between the damping portion and the bobbin and the housing. The method of claim 1,
The housing includes four sides,
The lens driving apparatus including a driving magnet disposed on each of the four side surfaces of the housing.

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