KR102326536B1 - Lens moving apparatus and camera module including the same - Google Patents

Abstract

The embodiment provides a housing, a bobbin disposed in the housing, a magnet disposed in the housing, a coil disposed in the bobbin and moving the bobbin in the optical axis direction by interaction with the magnet, damping disposed between the outer surface of the bobbin and the inner surface of the housing a portion, wherein an outer surface of the bobbin faces an inner surface of the housing in a direction perpendicular to the optical axis direction, and at least a portion of the coil is disposed on an outer surface of the bobbin.

Description

A lens driving device and a 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 for preventing the optical axis direction resonance of the bobbin by attenuating the optical axis direction vibration of the bobbin when autofocusing is executed .

In recent years, the development of IT products such as a mobile phone, a smart phone, a tablet PC, and a notebook computer with a built-in micro digital camera is being actively conducted.

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

However, in order to perform the autofocus function, the conventional micro digital camera has a control process of finding the point at which the sharpest image is generated in the image sensor based on the sharpness of the digital image formed in the image sensor according to the distance between the lens and the image sensor. configured to run. When this autofocus method is implemented, the bobbin with the lens is moved in the optical axis direction, and when the bobbin moves in the optical axis direction, the bobbin vibrates in the optical axis direction. When the frequency of vibration in the optical axis direction of the bobbin 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. When the lifespan of the elastic member is reduced or the resonance phenomenon is severe, there has been a problem in that the elastic member connecting the bobbin and the housing is damaged.

Accordingly, the embodiment provides a lens driving device capable of removing a resonance phenomenon when auto-focusing is performed, and a camera module including the same.

In addition, the embodiment provides a lens driving device for more efficiently removing a resonance phenomenon during auto-focusing, and a camera module including the same.

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

A lens driving device according to an embodiment includes a housing; a bobbin disposed within the housing; a magnet disposed on the housing; a coil disposed on the bobbin and moving the bobbin in an 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 in a direction perpendicular to the optical axis direction faces the inner surface of the housing, 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 area to which the damping part is attached, and the inner surface of the housing may include a second attachment area to which the damping part is attached.

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

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 fourth damping part disposed between a fourth outer surface of the bobbin and a 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 in the optical axis direction of the bobbin may be attenuated when auto-focusing is performed. For this reason, the embodiment may eliminate the resonance phenomenon in the optical axis direction of the lens driving device when auto-focusing is executed. 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 is provided with a damping connection between the bobbin and the housing for increasing the attachment area of the damping part, so that the damping area of the damping part can be increased, thereby more effectively eliminating the resonance phenomenon during auto-focusing. , it is possible to improve the attachment stability of the damping part between the bobbin and the housing.

Further, 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, and as a result, the hydraulic pressure of the cleaning liquid in the cleaning process Accordingly, it is possible to prevent some or all of the damping part from being lost.

1 is a schematic perspective view of a lens driving device according to an embodiment.
2 is a schematic exploded perspective view of a lens driving device according to an embodiment.
FIG. 3 is a schematic perspective view of the lens driving device with the cover member removed in FIG. 1 .
FIG. 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 the housing viewed from an angle different from that of 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 embodiment of the present invention;
14 is a partially enlarged perspective view of FIG. 13 .
FIG. 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 of the present invention.
18 is a bottom view of a bobbin and a housing according to an exemplary embodiment.
19 is a schematic longitudinal cross-sectional view of a bobbin, a housing, and a cover member according to an embodiment of the present invention.
20 is a schematic longitudinal cross-sectional view of a bobbin, a housing, and a cover member according to another embodiment.
21 is a schematic longitudinal cross-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 device according to the related art without a damping part.
23B is a graph of vibration in the optical axis direction of the lens driving device according to the embodiment.
23C is a graph showing the optical axis direction vibration of the lens driving device when the damping part is lost by the cleaning process of the lens driving device in the lens driving device according to the embodiment.

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

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

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

The lens driving apparatus 100 according to the embodiment is a device that adjusts the distance between the lens and the image sensor in the camera module so that the image sensor is positioned at the 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 device 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 an amount of displacement in a 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 . The driving magnet 130 and the printed circuit board 170 provided in the 140 are accommodated.

The cover member 300 has an opening on its upper surface 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 substances such as dust or moisture from penetrating into the camera module.

The cover member 300 may include a first groove portion 310 in the lower portion. At this time, as will be described later, when the cover member 300 and the base are coupled, the base 210 is placed in contact with the first groove portion 310 (that is, a position corresponding to the first groove portion 310). Two 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 coupling of the first groove portion 310 and the second groove portion 211 . An adhesive member having a viscosity may be applied to the concave portion. That is, the adhesive member applied to the concave portion fills a gap between the opposing surfaces of the cover member 300 and the base 210 through the concave portion, so that the cover member 300 is the base 210 . It is possible to seal between the cover member 300 and the base 210 while being coupled to, and also, as the cover member and the base are coupled, the side surface may be sealed.

In addition, a third groove portion 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 the plurality of terminals formed on the terminal surface. The third groove portion 320 may be concavely formed on the entire surface facing the terminal surface, and the adhesive member is applied to the inside of the third groove portion to form the cover member 300, the base 210, and the printed circuit board ( 170) may be sealed, and the side surface may be sealed while the cover member and the base are coupled.

On the other hand, the first groove portion 310 to the third groove portion 320 are formed in the base 210 and the cover member 300, respectively, but are not limited thereto, and are formed only in the base 210 in a similar shape or , may be configured to be formed only on the cover member 300 .

The base 210 may be provided in 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 outward with a predetermined thickness 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 or contacted or placed or coupled to the side. Due to this, 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 be in surface contact, and the end of the cover member has a bottom or a side surface. may include In this case, the step portion and the end of the cover member 300 may be adhesively fixed and sealed by 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 may be combined with the first groove portion 310 of the cover member 300 to form a groove portion, and may form a space in which the adhesive member is filled.

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 in the camera module.

In addition, the base 210 includes four guide members 216 protruding at right angles to a predetermined height in the upper direction from the four corners. The guide member may have a polygonal prism shape. The guide member 216 may be inserted, fastened, or coupled to a lower guide groove 148 of the housing 140 to be described later. In this way, due to the guide member 216 and the lower guide groove 148 , when the housing 140 is seated or disposed on the upper part of the base 210 , the housing 140 on the base 210 is coupled. It is possible to guide the position, and at the same time, it is possible to prevent the housing 140 from being separated from the reference position to be mounted due to vibration or the like during the operation process 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 an overall hollow column shape (eg, a hollow square column shape as shown in the drawings). The housing 140 is configured to support at least two or more driving magnets 130 and a printed circuit board 170 , and a bobbin 110 therein is movable in a first direction with respect to the housing 140 . The bobbin 110 is accommodated.

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

As shown in FIG. 9 , a through hole 141a or a groove for a magnet in which the driving magnet 130 is seated, disposed or fixed is provided on each of the opposite side surfaces of the four side surfaces 141 of the housing 140 . do. The through hole 141a or groove for the magnet 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, among the four side surfaces 141 of the housing 140, one side perpendicular to the both sides or a side other than the both sides is a through hole for a sensor into which a position detection sensor 180, which will be described later, is inserted, disposed, fixed, or seated. (141b) may be provided. The sensor through-hole 141b preferably has a size and shape corresponding to a position detection sensor 180 to be described later. In addition, at least one mounting protrusion 149 for allowing the printed circuit board 170 to be mounted or disposed or temporarily fixed or fixed is provided on the one side. The mounting protrusion 149 is inserted into a mounting through-hole 173 formed in a printed circuit board 170 to be described later, wherein the mounting through-hole 173 and the mounting protrusion 149 are shape-fitting. It can be said that it is preferable to be coupled by a method or an interference fit method, but only a simple guide function may be performed.

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

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

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

At this time, the first through-hole 141a for the magnet and the second through-hole 141a' for the magnet have the same size and the same shape, and (almost) the same over the entire 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 the same shape, than the first through-hole 141a for the magnet and the through-hole 141a' for the second magnet. The lateral length may be formed to be small. This is to secure a space for the sensor through hole 141b, since the sensor through hole 141b should be formed on one side where the third magnet through hole is formed.

Of course, each of the first through hole for the magnet to the through hole for the fourth magnet is seated, disposed, or fixed to each of the first driving magnet 131 to the fourth driving magnet. At this time, similarly, the first driving magnet 131 and the second driving magnet 132 have the same size and shape as each other, 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 the same shape, and have smaller lateral lengths than 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 disposed to face each other while being biased to 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 is tilted because the electromagnetic force acts to be biased on the one side. In other words, the third driving magnet 130 and the fourth driving magnet 130 are symmetrically disposed on a straight line with respect to the center of the housing 140 , so that the bobbin 110 and the coil 120 are symmetrical. ) can be applied to an electromagnetic force that is not biased, and guides the bobbin 110 to move in the first direction easily and accurately.

Also, 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 housing 140 body, 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 . collision can be avoided. 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 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 protrude from the upper side of the housing 140 . On the other hand, as will be described later, the outer frame 152 of the upper elastic member 150 corresponding to the upper frame support protrusion 144 may have a first through hole 152a or a groove having a corresponding shape formed therein. It may be fixed with an adhesive or fusion bonding, and the fusion bonding may include thermal fusion or ultrasonic fusion.

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 protrude from the lower side of the housing 140 . On the other hand, an insertion groove 162a or a hole having a corresponding shape may be formed in the outer frame 162 of the lower elastic member 160 corresponding to the lower frame support protrusion 147, where adhesive or fusion is applied. It may be fixed, and the fusion may include thermal fusion or ultrasonic fusion.

The driving magnet 130 may be fixed to the magnet through-hole 141a 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, a concave-shaped magnet seating part may be formed on the inner surface of the housing 140 instead of the through-hole 141a for the magnet, and the magnet seating part is 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 a single 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 may be an S pole. . However, the present invention is not limited thereto, and the reverse configuration is also possible. In addition, the driving magnet 130 may be configured to 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 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 form. 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, the opposite surfaces of the driving magnet 130 and the coil 120 of the bobbin 110 may be flatly disposed to be parallel to each other. However, the present invention is not limited thereto, and either 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, all of the facing surfaces of the coil 120 of the bobbin 110 and the driving magnet 130 may be curved surfaces, and in this case, the coil 120 of the bobbin 110 and the driving magnet 130 face each other. The curvature of the surface may be formed to be the same.

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

The position sensor 180 may be a displacement sensor 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 through hole 141b or groove for the sensor are disposed at a position corresponding to the position of the sensing magnet 190 .

The position sensor 180 may be a sensor that detects a change in magnetic force emitted from the sensing magnet 190 of the bobbin 110 . Also, the position sensor 180 may be a Hall sensor. However, this is an example, and the embodiment is not limited to the Hall sensor, and any sensor capable of detecting a change in magnetic force can be used, and any sensor capable of detecting a position other than magnetic force is possible, for example, , a method using a photoreflector or the like is also possible.

The printed circuit board 170 is coupled or disposed on one side of the housing 140, and may include a through hole 173 or a groove for mounting as described above. For this reason, 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, the printed circuit board 170 has a plurality of terminals 171 disposed therein, and may 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 increase or decrease according to the types of components that need to be controlled. Meanwhile, according to an embodiment, the printed circuit board 170 may be provided as an FPCB.

The printed circuit board 170 may include a control unit that readjusts the amount of current applied to the coil 120 based on the first displacement value detected by the displacement sensing unit, that is, the control unit is the printed circuit board It is mounted on 170. Also, in another embodiment, the control unit may be mounted on a separate board instead of being mounted on the printed circuit board 170, which may be a board on which the image sensor of the camera module is mounted, or may be a separate board. .

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

The bobbin 110 is configured to be reciprocally movable 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 axial 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 the ascending and/or descending operation of the bobbin 110 in the optical axis direction. The upper elastic member 150 and the lower elastic member 160 may be provided as a leaf spring.

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

The connecting 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 the rising and/or lowering operation in the first direction in the optical axis direction through a change in the position of the connection parts 153 and 163 and the minute deformation.

According to the embodiment, as shown in FIG. 9 , the upper elastic member 150 has a plurality of first through-holes 152a in the outer frame 152 and a plurality of second through-holes ( 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 coupled with the provided upper support protrusion. 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 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 predetermined range with respect to the outer frame 152 in the first direction.

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

As shown in FIG. 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 A groove may be provided.

The insertion groove 162a or hole is coupled to a lower frame support protrusion 147 provided on the lower surface of the housing 140, and the third through hole 161a or groove is a lower surface of the bobbin 110 to be described later. It is coupled with the lower support protrusion 114 provided in the . 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 joined.

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 predetermined range with respect to the outer frame 162 in the first direction.

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 lower elastic member 160 may receive power of different polarities or different power to the first lower elastic member 160a and the second lower elastic member 160b. 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 portion at a position of , power of different polarities or different power may be applied by performing a conductive connection such as soldering in the solder portion. In addition, the first lower elastic member is electrically connected to one of both ends of the coil, and the other one of the both ends of the coil and the second lower elastic member are electrically connected to each other to apply current and/or voltage from the outside. can receive

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

As a modified embodiment, the upper elastic member 150 may have a two-part structure, and the lower elastic member 160 may have an integrated 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 may be provided.

The damping unit serves as an attenuator for absorbing vibrations in the optical axis direction generated during the auto-focusing operation of the lens driving device. The damping unit is provided between a fixed body fixed to an original position without moving during the auto-focusing operation of the lens driving device and the movable 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, or a base, and the movable 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 are provided with a damping connection part to form an accommodating space for accommodating the damping part or an attachment region to which the damping part is attached. That is, the damping connection part includes 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 of the 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 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 partial enlarged perspective view, and FIG. 17 is a schematic longitudinal cross-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 be reciprocally movable in the optical axis direction. A coil 120 to be described later is installed on the outer circumferential surface of the bobbin 110 so that electromagnetic interaction with the driving magnet 130 of the housing 140 is possible. It is possible to reciprocate the bobbin 110 in the first direction due to the miracle 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. .

Although not shown, the bobbin 110 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 may be coupled to the inside of the bobbin 110 in various ways. For example, a female thread may be formed on the inner peripheral surface of the bobbin 110 , and a male thread corresponding to the thread may be formed on an outer peripheral surface of the lens barrel, and the lens barrel may be coupled to the bobbin 110 by screwing these threads. However, the present invention is not limited thereto, and the lens barrel may be directly fixed to the inside of the bobbin 110 by methods other than screw coupling without forming a screw 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 one sheet, or two or more lenses may be configured to form an optical system.

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

As shown in FIG. 11 , the upper support protrusion may be provided in a cylindrical or prismatic shape, 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 in 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. In this case, the distance between each of the upper support protrusions may be appropriately arranged within a range that can avoid interference with surrounding components. That is, each of the upper support protrusions may be arranged at regular intervals symmetrically with respect to the center of the bobbin 110 , and their intervals are not constant, but are symmetrical with respect to a specific virtual line passing through the center of the bobbin 110 . may be formed.

As shown in FIG. 12 , the lower support protrusion 114 may be provided in a cylindrical or prismatic shape like the upper support protrusion, and the inner frame 161 of the lower elastic member 160 and the bobbin 110 are provided. Can be combined and fixed. According to an embodiment, a third through hole 161a or a groove may be formed in a position corresponding to the lower support protrusion 114 of the inner frame 161 of the lower elastic member 160 . In this case, the lower support protrusion 114 and the third through hole 161a 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 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 at regular intervals symmetrically with respect to the center of the bobbin 110 .

In addition, on the upper and lower surfaces of the bobbin 110 , upper escape grooves 112 and A lower escape groove 118 is formed.

Since 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 parts 153 , 163 and the bobbin 110 are connected to each other. It is possible to more easily elastically deform the connection parts 153 and 163 by removing the spatial interference. In addition, the location of the upper escape groove may be disposed on 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 connection part 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 a ring-shaped coil block inserted and coupled to the outer peripheral surface of the bobbin 110 or the coil seating groove 116 or the seating portion, but is not limited thereto. It may be directly wound on the outer peripheral surface of the bobbin 110 or the seating groove 116 for the coil or the seating part.

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. In addition, at least four surfaces of the coil 120 may be provided 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 . Also, the surface of the driving magnet 130 corresponding to the coil 120 may have the same curvature as that of the coil 120 . That is, if the coil 120 is a straight line, the surface of the corresponding driving magnet 130 may be a straight line, and if the coil 120 is curved, the corresponding driving magnet 130 may have a curved surface. and may also have the same curvature. In addition, even if the coil 120 is curved, the corresponding driving magnet 130 may have a straight surface or vice versa.

The coil 120 is for performing an autofocus function by moving the bobbin 110 in the optical axis direction. When current is supplied, an electromagnetic force can be formed through electromagnetic interaction with the driving magnet 130 , and formed Electromagnetic force may move the bobbin 110 .

Meanwhile, the coil 120 may be configured to correspond to the driving magnet 130 . As shown, the driving magnet 130 is configured as 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 plane 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 .

In addition, the bobbin 110 includes a sensing magnet 190 included in the displacement detecting unit together with the position detecting sensor 180 of the above-described housing 140 . The sensing magnet 190 is fixed, disposed, or coupled to the bobbin 110 . For this reason, 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 a single body, and the upper direction of the bobbin 110 may be an N pole and a lower direction of the bobbin 110 may be an S pole. However, the present invention is not limited thereto, and the reverse configuration is also possible. Also, 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 an outer circumferential surface of the bobbin 110 .

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

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 part of the receiving groove 117 may be concave to a predetermined depth in the inner direction 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 sensing magnet 190 for the sensing magnet 190 can be accommodated. Since there is no need to secure an installation space, the 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 detection sensor 180 of the housing 140 (or a position opposite to the position detection sensor 180 ). For this reason, the distance between the sensing magnet 190 and the position detection sensor 180 is the thickness of the coil 120 and the separation distance between the coil 120 and the position detection sensor 180 or the coil and the position detection sensor Since the distance can be minimized by further including the distance between them, the magnetic force detection accuracy of the position sensor 180 can be improved.

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

More specifically, as shown in FIGS. 15 to 17 , the receiving groove 117 has an inner surface on which one surface of the sensing magnet 190 is supported, and a predetermined smaller than the inner surface so that an adhesive can be injected. It may include an adhesive groove 117b concave further inwardly.

The inner surface is one surface positioned inward toward the center of the bobbin 110, and when the sensing magnet 190 has a rectangular parallelepiped shape, the wide surface of the sensing magnet 190 is in contact or is seated. am.

The bonding groove 117b may be a groove formed so that a portion of the inner surface is concave deeper inward toward the center of the bobbin 110 . The bonding 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 contacted, seated or disposed.

17 , the bonding groove 117b further includes a first additional groove 117c formed to be 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 back surface of the sensing magnet 190 is in contact with, seated or disposed. am. By having the first additional groove 117c, when the adhesive is injected into the bonding groove 117b through the opening 119, the adhesive is filled from the first additional groove 117c to seal the inside of the bonding groove 117b. Since it is filled, it is possible to prevent the adhesive from overflowing from the bonding groove 117b and flowing to the coil 120 along the gap between the sensing magnet 190 and the receiving groove 117, so the sensing magnet 190 ) can reduce the failure rate of the lens driving device 100 during the coupling process.

In addition, the bonding groove 117b further includes a second additional groove 117a formed to a predetermined depth in an inward direction from the opening 119 toward the center of the bobbin 110 . That is, the second additional groove 117a is formed to be deeper inward toward the center of the bobbin 110 than the inner surface in the vicinity of the opening 119 . The second additional groove 117a communicates 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 ( 120), etc., can be prevented from being adhered to other components of the bobbin 110, thereby reducing the failure rate of the lens driving device 100 during the coupling process of the sensing magnet 190.

In addition, as a modified embodiment, the second additional groove 117a may be provided on the bobbin 110 alone without the adhesive groove 117b. In this case, an 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 include only the first additional groove 117c or only the second additional groove 117a.

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

As a further embodiment, although not shown in the drawings, the bobbin 110 is symmetrical with the receiving groove 117 with respect to the center of the bobbin 110 on the outer peripheral surface facing the outer peripheral surface where the receiving groove 117 is formed. It may further include an additional accommodating groove 117 formed on the outer peripheral surface of the bobbin 110 and a weight balancing member accommodated in the additional accommodating groove 117 at the fixed position.

That is, the additional receiving groove 117 is a bobbin with a predetermined depth at a position symmetrical with the receiving groove 117 in a straight line with respect to the center of the bobbin 110 on the outer peripheral surface facing the outer peripheral surface where the receiving groove 117 is formed. (110) is formed in the inward direction. And, the weight balancing 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 accommodating groove 117 and the weight balancing member, the horizontal weight imbalance of the bobbin 110 due to the provision of the accommodating groove 117 and the sensing magnet 190 is reduced by the mounting of the weight balancing member. can be compensated

Preferably, the additional receiving groove 117 may include at least one of the adhesive 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 the embodiment, and FIG. 19 is the bobbin 110, the housing 140 and the cover member 300 according to the embodiment. 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, Figure 21 is another embodiment of the embodiment It is a schematic longitudinal cross-sectional view of the bobbin 110 and the cover member 300 according to the embodiment.

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 unit 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 vibration 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 a predetermined range with respect to the housing 140 in the first direction.

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

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

Here, in the semi-curing process of the damping part 410, the space between the bobbin 110 and the housing 140 (ie, the space provided with the damping part 410 and the damping part 410) is subjected to light (or UV). by exposing it to the

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 from each other 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 of the bobbin 110 is uniformly absorbed around the bobbin 110 in the optical axis direction caused by the movement of the bobbin 110 during the auto-focusing operation of the lens driving device 100 in one direction. This is to avoid being biased.

Also, preferably, when an even number of the plurality of damping parts 410 is provided, the plurality of damping parts 410 are disposed to face each other in pairs between the bobbin 110 and the housing 140 . can

The bobbin 110 and the housing 140 include a damping connection part 420 . In other words, the connecting portion 420 for damping the wing 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 accommodated 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 the semi-hardening 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 housing 140 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 spatially 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 member of the bobbin 110 and the housing 140 , and among 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, as shown in the drawings, if possible, the damping protrusion 421 is provided on the bobbin 110 and the damping receiving groove 423 is provided on the housing 140 . 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 the first opposed surface P1 , and the opposite surface belonging to the housing 140 is the opposite surface P1 . When the surface is referred to as the second opposed surface P2 , the damping protrusion 421 is provided on the first opposed surface P1 as shown in FIGS. 18 to 21 . Of course, when the damping protrusion 421 is provided on the housing 140 , the damping protrusion 421 may be provided on the second opposing surface P2 .

The damping protrusion 421 horizontally protrudes from the first facing surface P1 of the bobbin 110 toward the housing 140 or the second facing surface P2 by a predetermined length. 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 a height of the damping receiving groove 423 to be described later.

A plurality of the damping receiving grooves 423 are provided at positions corresponding to the positions of the damping protrusions 421 on the second opposed surface P2 of the housing 140 .

The damping accommodating groove 423 is concavely formed to accommodate a portion of the damping protrusion 421 and the damping portion 410 on the second opposing 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 opposed surface P2 of the housing 140 .

In addition, the damping receiving groove 423 has a predetermined width (that is, a left and right length in the horizontal direction) and a predetermined height (ie, a vertical length in the vertical direction). At this time, the damping accommodating groove 423 has a predetermined width of the damping accommodating groove 423 greater than a width of the damping protrusion 421 and the damping accommodating groove 423 has a predetermined height. It is configured to be larger than a predetermined thickness of the damping protrusion 421 .

In other words, the damping accommodating groove 423 and the damping protrusion 421 are formed so that the opposite surfaces of the damping accommodating groove 423 and the damping protrusion 421 are spaced apart from each other 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 an accommodating space in which the opposite surfaces of the damping receiving groove 423 and the damping protruding 421 facing each other are spaced apart from each other by a predetermined distance.

The damping accommodating groove 423 has a stepped portion 423a defined on the inner surface of the housing 140 from the upper or lower portion. For example, when the damping accommodating groove 423 is provided at the lower portion of the housing 140 , the stepped portion 423a is formed between the inner surface of the housing 140 and the lower surface of the housing 140 . formed 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 between the inner surface of the housing 140 and the upper surface of the housing 140 . formed parallel. Due to the stepped portion 423a, the damping portion 410 before the semi-hardening process may 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 can be stably maintained at a desired position by the operator, thereby facilitating the final forming process of the damping part 410 (ie, semi-hardening process).

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

As shown in FIG. 18 , the damping part 410 , the damping protrusion 421 , and the damping receiving groove 423 are formed in the bobbin 110 and the housing 140 in the bobbin 110 and The housing 140 is provided at the corners of the opposing surfaces. In this case, each of the plurality of driving magnets 130 is seated, disposed, or fixed to each of the second opposed 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 the 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 the bobbin 110 and the housing 140 in the bobbin 110 and the housing 140. The housing 140 is shown in various embodiments of the provided position according to the height in the corners of the opposing 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 formed in the housing 140 . ) from the open lower end (that is, the beginning of the damping receiving groove 423) is formed to be higher than the damping protrusion by a predetermined height.

That is, the damping protrusion 421 and the damping accommodating groove 423 are at a position where the stepped portion 423a of the damping accommodating groove 423 is higher than the upper surface of the damping protrusion 421 by a predetermined height. provided to be formed.

In such a 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 are disposed at the lower part of the housing 140 and/or the bobbin 110 . It is closed by the upper surface of the base 210 coupled to. That is, exposure of the damping part 410 to the outside is blocked by the upper surface of the base 210 .

Therefore, since the cleaning process of the lens driving device 100 is performed 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 may affect the damping part 410 . Therefore, it is possible to reliably prevent loss or loss of the damping unit 410 due to the cleaning process of the lens driving device 100 .

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

That is, the damping protrusion 421 and the damping accommodating groove 423 are at a position where the stepped portion 423a of the damping accommodating groove 423 is lower than the lower surface of the damping protrusion 421 by a predetermined height. provided to be formed.

In this situation, upon completion of the assembly process of the lens driving device 100 , the open upper end of the housing 140 and the damping part 410 are disposed on the upper portion of the housing 140 and/or the bobbin 110 . It is closed by the upper surface (ie, the inner surface of the upper surface) of the cover member 300 coupled to the. That is, the damping part 410 is blocked from exposure to the outside by the upper surface of the cover member 300 .

Therefore, since the cleaning process of the lens driving device 100 is performed 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 . Therefore, it is possible to reliably prevent loss or loss of the damping unit 410 due to the cleaning process of the lens driving device 100 .

In addition, as shown in FIG. 21 , according to another embodiment of the embodiment, the damping protrusion 421 is a middle height of the bobbin 110 on the first opposed surface P1 of the bobbin 110 . is provided, and the damping receiving groove 423 is formed to be higher than the damping protrusion from the open lower end of the housing 140 by a predetermined height.

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

And, in this case, since the damping part 410 is disposed deep from the bobbin 110 and the housing 140 with respect to the lower portions of the bobbin 110 and the housing 140, the 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, there is no risk of loss of the damping unit 410 even if the cleaning process is performed before the base 210 and the housing 140 and/or the bobbin 110 are combined.

Although not shown in the drawings, as a modified example of another embodiment of the embodiment, the damping protrusion 421 is provided at an intermediate height of the bobbin 110 on the first opposite surface P1 of the bobbin 110 . and a predetermined height lower than the damping protrusion from the open upper end of the housing 140 .

In this case, similarly to another embodiment of the above-described embodiment, the lens driving device 100 is not sealed with the open upper end and the damping part 410 by the cover member 300 . 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 part 410 even if the cleaning process is performed before the coupling of the cover member 300 and 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 are formed between 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 opposing 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 edge surfaces of the second opposing 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 the surface on which the plurality of driving magnets 130 are seated. However, the embodiment is not limited to the position described above 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 the bobbin 110 and the housing ( In 140), the position of the bobbin 110 and the housing 140 may be embodied in various embodiments according to the height on the opposing surfaces facing each other.

23A is a graph of the optical axis direction vibration of the lens driving apparatus 100 according to the prior art without the damping unit 410, and FIG. 23B is a graph of the optical axis direction vibration of the lens driving apparatus 100 according to the embodiment. , 23C is a graph of the optical axis direction vibration of the lens driving device 100 when the damping unit 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 in the vibration experiment during the auto-focusing operation of the lens driving device 100 shown in FIG. 23A, It can be confirmed that a resonance point or resonance section (refer to the red circle mark) where the amplitude is maximized occurs.

On the other hand, 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 confirmed that the resonance point or resonance section shown in the result graph in the vibration experiment during the auto-focusing operation of the lens driving device 100 shown in FIG. 23A is removed.

However, even in the lens driving device 100 provided with the damping unit 410 , when the cleaning process of the lens driving device 100 is performed with respect to the lens driving device 100 , the damping unit 410 is the cleaning liquid hydraulic pressure of the cleaning process. Some or all of the loss occurs frequently by (refer to the red circle mark) can be confirmed that it occurs again.

In the embodiment, in order to prevent the re-occurrence of the resonance point or resonance section due to the loss or loss of the damping part 410 by the cleaning process, as described above, the damping connection part for safely accommodating, disposing, or fixing the damping part 410 as described above. The damping part 410 is sealed by the base 210 and/or the cover member 300 so that the damping part 410 and the damping connection part 420 are provided to the outside during the cleaning process. was not exposed.

As described above, the embodiment includes a damping unit between the bobbin and the housing, so that vibration in the optical axis direction of the bobbin can be attenuated when auto-focusing is performed. For this reason, the embodiment may eliminate the resonance phenomenon in the optical axis direction of the lens driving device when auto-focusing is executed. As a result, the embodiment can prevent damage or breakage of the upper elastic member and/or the lower elastic member connecting the bobbin and the housing.

In addition, the embodiment is provided with a damping connection between the bobbin and the housing that increases the attachment area of the damping part, so that the damping area of the damping part can be increased. In addition, it is possible to improve the attachment stability of the damping part between the bobbin and the housing.

Further, 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, and as a result, the cleaning liquid in the cleaning process It is possible to prevent some or all of the damping part from being lost due to hydraulic pressure.

In addition, coupling the lens to the lens driving device of the embodiment, and further comprising a printed circuit board on which an image sensor and an image sensor are disposed to configure the camera module, the base of the lens driving device and the image sensor are disposed It can be combined with printed circuit boards.

In addition, the camera module may further include a camera module control unit, comparing the focal length of the lens according to the distance between the first displacement value calculated based on the current change value detected by the displacement detection unit and the subject and the lens do. Thereafter, the camera module control unit 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 the bobbin 110 . may be moved by a second displacement amount in the first direction. In addition, the displacement detection unit, the position detection sensor 180 fixedly coupled to the housing 140, which is a fixed body, is for the sensing according to the first direction movement of the sensing magnet 190 fixedly coupled to the bobbin 110 which is a moving body. The current position or the first displacement amount of the bobbin 110 in a separate driver IC or the camera module controller based on the current change amount output by detecting the change in magnetic force emitted from the magnet 190, and output based on the detected magnetic force change amount can be calculated or judged. The current position or the first displacement amount of the bobbin 110 calculated or determined by the displacement sensing unit in this way is transmitted to the control unit of the printed circuit board 170, and the control unit recrystallizes the position of the bobbin 110 for auto-focusing, so that the coil ( 120) to adjust the amount of applied current.

In the above, specific embodiments have been shown and described to illustrate the technical idea of the embodiments, but the embodiments are not limited to the same configuration and operation as the specific embodiments as described above, and various modifications are carried out within the limits that do not depart from the scope of the embodiments. can be Accordingly, such modifications should be considered to be within the scope of the embodiments, and the scope of the embodiments should be determined by the claims to be described later.

Claims (15)

housing;
a bobbin disposed within the housing;
a magnet disposed on the housing;
a coil disposed on the bobbin and moving the bobbin in an 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;
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 is disposed on the outer surface of the bobbin,
the outer surface of the bobbin includes a first attachment area to which the damping portion is attached, and the inner surface of the housing includes a second attachment area to which the damping portion is attached;
The bobbin includes a protrusion that protrudes in a direction perpendicular to the optical axis direction, and the housing includes a groove formed at a position corresponding to the protrusion of the bobbin,
the first attachment region is formed on the protrusion of the bobbin, and the second attachment region is formed on the groove of the housing;
The protrusion of the bobbin is formed between an upper end of the outer surface of the bobbin and a lower end of the outer surface of the bobbin, and is spaced apart from the upper end of the outer surface of the bobbin. According to claim 1,
The groove of the housing is formed between an upper end of the inner surface of the housing and a lower end of the inner surface of the housing,
The damping unit enables the bobbin to flow in the optical axis direction with respect to the housing, and attenuates vibration in the optical axis direction. According to claim 1,
A part of the damping part is attached to the end of the protrusion,
wherein the coil is disposed below the first attachment region of the bobbin. According to claim 1,
The damping unit,
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
and a fourth damping part disposed between a fourth outer surface of the bobbin and a fourth inner surface of the housing. According to claim 1,
an elastic member including an inner frame coupled to the bobbin, an outer frame coupled to the housing, and a connecting portion connecting the inner frame and the outer frame; and
and a base disposed under the housing. 6. The method of claim 5,
The elastic member includes two elastic members electrically connected to both ends of the coil. 7. The method of claim 6,
and a circuit board electrically connected to the two elastic members. According to claim 1,
The coil is a lens driving device having a ring shape coupled to the outer surface of the bobbin. According to claim 1,
The damping part is formed of a photocurable resin,
The damping unit is provided in a semi-hardened gel state between the bobbin and the housing. According to claim 1,
The housing comprises four sides,
The magnet is a lens driving device including a driving magnet disposed on each of the four side surfaces of the housing. housing;
a bobbin disposed within the housing;
a coil and a magnet for moving the bobbin in an optical axis direction by interaction; and
a damping part disposed between the first outer surface of the bobbin and the first inner surface of the housing;
The first outer surface of the bobbin in a direction perpendicular to the optical axis direction faces the first inner surface of the housing,
the first outer surface of the bobbin includes a first attachment area to which the damping portion is attached, and the first inner surface of the housing includes a second attachment area to which the damping portion is attached;
The bobbin includes a protrusion that protrudes in a direction perpendicular to the optical axis direction, and the housing includes a groove formed at a position corresponding to the protrusion of the bobbin,
the first attachment region is formed on the protrusion of the bobbin, and the second attachment region is formed on the groove of the housing;
The protrusion of the bobbin is formed between an upper end of the first outer surface of the bobbin and a lower end of the first outer surface of the bobbin, and is spaced apart from the upper end of the first outer surface of the bobbin. 12. The method of claim 11,
the groove of the housing is formed between an upper end of the first inner surface of the housing and a lower end of the first inner surface of the housing;
A part of the damping part is attached to the end of the protrusion,
wherein the coil is disposed below the first attachment region of the bobbin. 12. The method of claim 11,
an elastic member coupled to the bobbin and the housing; and
a base disposed under the housing;
The elastic member includes two elastic members electrically connected to both ends of the coil. 14. The method of claim 13,
and a circuit board electrically connected to the two elastic members. 12. The method of claim 11,
The damping part is formed of a photocurable resin,
The damping unit is provided in a semi-hardened gel state between the bobbin and the housing.

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