KR20230006611A - Lens moving apparatus - Google Patents

Abstract

In an embodiment of the present invention, by dividing both ends of a coil into upper and lower parts and electrically connecting the same to a printed circuit board through an upper elastic member and a lower elastic member, the printed circuit board is used as an intermediate connecting means to electrically connect an external power source to the coil as a result. Through this, in this embodiment, connection points of both ends of the coil of the bobbin can be divided and distributed to the upper elastic member and the lower elastic member, so that a sufficient working space for connection between the coil and the external power source can be secured.

Description

Lens driving device {LENS MOVING APPARATUS}

The present embodiment relates to a lens driving device, and more particularly, to a lens driving device capable of reducing a focus alignment time of a lens by feeding back an amount of displacement of a lens in an optical axis direction while improving space efficiency of a bobbin.

In recent years, the development of IT products such as mobile phones, smart phones, tablet PCs, and laptops with built-in micro digital cameras has been actively conducted.

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

However, a conventional subminiature digital camera has a problem in that a working space for connection (eg, soldering or soldering) between a coil and an external power source is narrow in order to perform an auto focus function.

Accordingly, an object of this embodiment is to provide a lens driving device that solves the problems of the prior art.

Specifically, an object of the present embodiment is to provide a lens driving device capable of securing a working space for connection between a coil of a bobbin and an external power source supplying current to the coil.

In addition, an object of the present embodiment is to provide a lens driving device capable of securing a working space for connection between a coil of a bobbin and an external power source supplying current to the coil without increasing the manufacturing cost of the upper elastic member and the lower elastic member. .

According to one embodiment of the present embodiment, the present embodiment includes a hollow pillar-shaped housing for supporting a driving magnet; a bobbin having a coil disposed inside the driving magnet on an outer circumferential surface and moving in a first direction parallel to the optical axis inside the housing by electromagnetic interaction between the driving magnet and the coil; an upper elastic member and a lower elastic member elastically connecting the housing and the bobbin and electrically connected to both end lines of the coil; A printed circuit board provided on one side of the housing and including an input terminal unit and an output terminal unit electrically connected to an external power source, wherein the upper elastic member is electrically connected to one terminal unit of the input terminal unit and the output terminal unit. Is connected to, and the lower elastic member can provide a lens driving device characterized in that electrically connected to the other terminal of the other one of the input terminal and the output terminal.

Also, preferably, the upper elastic member and the lower elastic member include an inner frame coupled to one of the upper and lower surfaces of the bobbin, and an outer frame coupled to one of the upper and lower surfaces of the housing and , It characterized in that it comprises a connecting portion for connecting the inner frame and the outer frame elastically.

Also, preferably, the one terminal part and the other terminal part are provided toward the outside from the lower part of the printed circuit board.

Also, preferably, the one terminal unit is provided at the same height as the upper elastic member on the inner surface of the printed circuit board and is electrically connected to an upper connection terminal unit electrically connected to the upper elastic member. The other terminal unit is provided at the same height as the lower elastic member on the inner surface of the printed circuit board and is electrically connected to the lower connection terminal unit electrically connected to the lower elastic member.

Also, preferably, the one terminal part and the upper connection terminal part are electrically connected by one printed circuit among a plurality of printed circuits provided on the printed circuit board, and the other terminal part and the lower connection part The terminal unit is characterized in that it is electrically connected by another printed circuit among a plurality of printed circuits provided on the printed circuit board.

Also, preferably, one end line of both end lines of the coil is electrically connected to the inner frame of the lower elastic member, and the other end line of the both end lines of the coil is electrically connected to the inner frame of the upper elastic member. It is characterized in that it is connected to.

Also, preferably, the outer frame of the upper elastic member includes a first intermediate terminal portion provided in a horizontal outward direction and electrically connected to the one terminal portion, and the outer frame of the lower elastic member is provided in a horizontal outward direction. and a second intermediate terminal portion electrically connected to the other terminal portion.

Also, preferably, the first intermediate terminal unit and the second intermediate terminal unit are provided on one side opposite to the inner surface of the printed circuit board in the outer frame.

Also, preferably, the first intermediate terminal portion is provided at the same height as the upper elastic member on the inner surface of the printed circuit board and is electrically connected to an upper connection terminal portion electrically connected to the one terminal portion, The second intermediate terminal unit is provided at the same height as the lower elastic member on the inner surface of the printed circuit board and is electrically connected to a lower connection terminal unit electrically connected to the other terminal unit.

Also, preferably, the first intermediate terminal portion and the second intermediate terminal portion are characterized in that they have flow-limiting cutouts formed by cutting some outer portions of the outer frame on both side surfaces.

Further, preferably, the housing includes a first avoidance cutout formed to a predetermined depth in the lower part of the first intermediate terminal on an outer surface facing the inner surface of the printed circuit board, and an inner surface of the printed circuit board. It is characterized by having a second avoidance cutout formed at a predetermined height on the upper part of the second intermediate terminal part on the outer surface facing the side surface.

Also, preferably, the coil is wound on the outer circumferential surface of the bobbin in three or six layers.

In addition, preferably, it is characterized in that it further comprises; a displacement detecting unit for determining a first displacement value of the bobbin in the first direction.

Also, preferably, the displacement sensing unit corresponds to a magnet for sensing provided on the inside of the printed circuit board in the bobbin and a magnet for sensing on an inner surface of the printed circuit board provided on one side of the housing. It is provided at a position and characterized in that it includes a position sensor for detecting a first displacement value of the sensing magnet in the first direction.

Also, preferably, the bobbin may further include an accommodation groove formed inwardly at a predetermined depth on an outer circumferential surface of the bobbin to accommodate the sensing magnet.

According to the above-described problem solving means, the present embodiment divides both ends of the coil up and down and electrically connects them to the printed circuit board through the upper elastic member and the lower elastic member, thereby using the printed circuit board as an intermediate connecting means, resulting in An external power source can be electrically connected to the coil. Due to this, in this embodiment, the connection points of both ends of the coil of the bobbin can be divided into the upper elastic member and the lower elastic member, so that a sufficient working space for connection between the coil and the external power source can be secured.

In addition, in this embodiment, the upper elastic member and the lower elastic member are coiled without adding a separate structure to the upper elastic member and the lower elastic member by simply forming the cutout for limiting the passage in the outer frame of the upper elastic member and the lower elastic member. It can be used as an intermediate connecting means of Due to this, the present embodiment can secure a working space for connection between the bobbin coil and an external power source supplying current to the coil without increasing the manufacturing cost of the upper elastic member and the lower elastic member.

In addition, the present embodiment can prevent a fluid conductive material (for example, a soldering liquid when the connection process is soldering) from flowing to parts other than the terminal unit during a connection process between the coil and an external power source. Due to this, the present embodiment can prevent melting or damage of a base material such as a housing or a printed circuit board due to a high-temperature fluid conductive material generated during the connection process, thereby significantly reducing the defect rate of the lens driving device. .

1 is a schematic perspective view of a lens driving device according to an embodiment of the present invention;
2 is a schematic exploded perspective view of a lens driving device according to an embodiment of the present invention;
3 is a schematic perspective view of the lens driving device in FIG. 1 from which the cover member is removed;
Figure 4 is a schematic plan view of Figure 3,
5 is a schematic perspective view of a housing according to one embodiment of the present 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 one embodiment of the present embodiment;
8 is a schematic exploded perspective view of a housing according to one embodiment of the present embodiment;
9 is a schematic plan view of an upper elastic member according to an embodiment of the present embodiment;
10 is a schematic plan view of a lower elastic member according to an embodiment of the present embodiment;
11 is a schematic perspective view of a printed circuit board according to one embodiment of the present embodiment,
12 is a schematic perspective view of a bobbin according to one embodiment of the present embodiment,
13 is a schematic bottom perspective view of the bobbin according to one embodiment of the present embodiment,
14 is a schematic exploded perspective view of a bobbin according to an embodiment of the present embodiment;
15 is a partially enlarged perspective view of FIG. 14;
16 is a partially enlarged bottom view of FIG. 14;
17 is a schematic partially enlarged perspective view of a receiving groove according to an embodiment of the present embodiment;
18 is a schematic longitudinal cross-sectional view of a bobbin according to one embodiment of the present embodiment,
19 is a schematic partial longitudinal sectional view of a lens driving device according to an embodiment of the present invention;
20 is a schematic partially enlarged perspective view of an upper portion of a lens driving device according to an embodiment of the present invention;
21 is a schematic partially cut-away perspective view of an upper portion of the lens driving device of FIG. 20;
22 is a schematic perspective view of a lower portion of a lens driving device according to an embodiment of the present invention;
23 is a schematic partially enlarged perspective view of a lower portion of a lens driving device according to an embodiment of the present invention.

Hereinafter, a preferred embodiment of the present embodiment will be described so that those skilled in the art can easily implement it with reference to the accompanying drawings. It should be noted that the drawing numbers indicated on the components in the accompanying drawings use the same reference numbers as much as possible when indicating the same components in other drawings. In addition, in describing the present embodiment, if it is determined that a detailed description of a related known function or known configuration may unnecessarily obscure the gist of the present embodiment, the detailed description thereof will be omitted. And certain features presented in the drawings are enlarged, reduced, or simplified for ease of explanation, 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 18, an orthogonal coordinate system (x, y, z) may be used. In the drawing, the x-axis and the y-axis mean planes perpendicular to the optical axis, and for convenience, the optical axis direction (z-axis direction) can 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 device 100 according to an embodiment of the present invention, FIG. 2 is a schematic exploded perspective view of the lens driving device 100 according to an embodiment of the present embodiment, and FIG. 1 is a schematic perspective view of the lens driving device 100 with the cover member 300 removed, FIG. 4 is a schematic plan view of FIG. 3, and FIG. 5 is a schematic view of the housing 140 according to one embodiment of this embodiment. 6 is a schematic perspective view of the housing 140 viewed from an angle different from that of FIG. 5, FIG. 7 is a schematic bottom perspective view of the housing 140 according to one embodiment of the present embodiment, and FIG. A schematic exploded perspective view of the housing 140 according to one embodiment of the embodiment, Figure 9 is a schematic plan view of the upper elastic member 150 according to one embodiment of this embodiment, Figure 10 is one embodiment of this embodiment A schematic plan view of the lower elastic member 160 according to, Figure 11 is a schematic perspective view of the printed circuit board 170 according to an embodiment of the present embodiment,

The lens driving device 100 according to the present 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.

As shown in FIGS. 1 to 4, the lens driving device 100 according to the present embodiment is provided in the cover member 300, the upper elastic member 150, the bobbin 110, and the bobbin 110. The coil 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 bobbin 110 and a displacement detector for determining a displacement amount in an optical axis direction (ie, a first direction).

The cover member 300 may have a box shape as a whole and 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 on 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 an upper surface through which a lens coupled to the bobbin 110 can be exposed to external light. Further, additionally, 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 portion 310 at a lower portion. At this time, as will be described later, when the cover member 300 and the base are coupled, the base 210 is located at a portion in contact with the first groove portion 310 (ie, a position corresponding to the first groove portion 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 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 the gap between the surfaces of the cover member 300 and the base 210 facing each other through the concave portion, so that the cover member 300 is attached to the base 210 While being coupled with, it is possible to seal between the cover member 300 and the base 210, and also, as the cover member and the base are coupled, the side surface can be sealed.

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 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 a cover member 300, a base 210, and a printed circuit board ( 170) can be sealed, and side surfaces can be sealed while the cover member and the base are coupled.

Meanwhile, the first groove portion 310 to the third groove portion 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 or , It 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 by a predetermined thickness may be provided to surround the lower rim 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 can 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 part, and also, the end of the cover member 300 can be coupled so as to be in surface contact, and the end of the cover member faces the bottom or side surface. can include At this time, the stepped portion and the end of the cover member 300 may be adhesively fixed and sealed with an adhesive or the like.

A second groove part 211 may be formed at a position corresponding to the first groove part 310 of the cover member 300 in the stepped part. 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 concave portion and form a space filled with an adhesive member.

The base 210 has an opening near the center. The opening may be formed at a position corresponding to a position of an 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 an upward direction from four corner portions. The guide member may have a polygonal columnar shape. The guide member 216 may be inserted into, fastened to, 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 placed on the upper part of the base 210, the housing 140 on the base 210 is coupled. The position can be guided, and at the same time, it is possible to prevent the housing 140 from being deviated from the reference position to be mounted due to vibration during the operation of the lens driving device 100 or due to a worker's mistake during the assembly process.

As shown in FIGS. 4 to 9 , the housing 140 may have a hollow column shape as a whole (for example, a hollow rectangular column shape as shown in the drawings). The housing 140 is configured to support at least two or more driving magnets 130 and the printed circuit board 170, and the 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. A side surface of the housing 140 may have an area corresponding to or larger than that of the driving magnet 130 .

As shown in FIG. 9, each of the opposite side surfaces of the four side surfaces 141 of the housing 140 is provided with a through hole 141a or a groove for a magnet in which the driving magnet 130 is seated, placed, or fixed. It can be. The magnet through hole 141a or groove may have a size and shape corresponding to that of 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 magnet through holes 141a.

And, among the four side surfaces 141 of the housing 140, one side perpendicular to the both side surfaces or a side other than the both side side surfaces has a through-hole for a sensor into which a position sensor 180 to be described later is inserted or disposed or fixed or seated. (141b) may be provided. The sensor through hole 141b preferably 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 may be provided to allow the printed circuit board 170 to be mounted or placed or temporarily fixed or fixed. The mounting protrusion 149 is inserted into a mounting through-hole 173 formed in a printed circuit board 170, which will be described later. At this time, the mounting through-hole 173 and the mounting protrusion 149 form a form-fit It may be desirable to be combined in a method or an interference fit method, but may also perform only a simple guide function.

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, each of the opposite side surfaces facing each other among 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, placed, or fixed. (141a) (141a') may be provided. In addition, among the four side surfaces 141 of the housing 140, one side perpendicular to the both side surfaces or a side other than the both side surfaces is a third magnet through-hole and a sensor formed by being spaced apart from the third magnet through-hole by a predetermined distance. A through hole 141b may be provided. In addition, among the four side surfaces 141 of the housing 140, a through hole for a fourth magnet may be provided on the other side facing the one side.

That is, four through-holes for magnets and one through-hole 141b for sensors may be provided on the four side surfaces 141 of the housing 140 .

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

Naturally, each of the first driving magnets 131 to the fourth driving magnets may be seated, disposed, or fixed to each of the through holes for the first magnet through the through hole for the fourth magnet. At this time, similarly, 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 The third driving magnet and the fourth driving magnet have the same size and shape, and have a smaller lateral length 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 disposed symmetrically 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 disposed symmetrically 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 facing 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 biasedly on the 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 unbiased electromagnetic force to guide the movement of the bobbin 110 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 a collision between the cover member 300 and the body of the housing 140, and when an external impact occurs, the upper surface of the housing 140 is directly attached to 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. To this end, as shown in FIG. 9, the first stopper 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 coupled to the outer frame 152 of the upper elastic member 150 may protrude from 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, and the fusion may include thermal fusion or ultrasonic fusion.

In addition, as shown in FIG. 7 , a plurality of lower frame support protrusions 147 coupled to the outer frame 162 of the lower elastic member 160 may 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 adhesive or fusion is used. It may be fixed, and 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 double-sided tape may be used. Alternatively, as a modified embodiment, a concave-shaped magnet seat may be formed on the inner surface of the housing 140 instead of the through hole 141a for the magnet, and the magnet seat may be formed in a 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 on the bobbin 110 . In addition, the driving magnet 130 may be composed of one body, and in the case of the present embodiment, the side facing the coil 120 of the bobbin 110 may be arranged to have the N pole and the outer side to have the S pole. there is. However, it is not limited thereto, and a converse configuration is also possible. In addition, the driving magnet 130 may be divided into two planes perpendicular to the optical axis.

The driving magnet 130 is composed of a rectangular parallelepiped shape having a certain width, and is seated in the magnet through hole 141a or groove so that the wide surface of the driving magnet 130 is part of the side surface of the housing 140. can form At this time, 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 . At this time, surfaces of the driving magnet 130 and the coil 120 of the bobbin 110 facing each other may be flatly arranged so as to be parallel to each other. However, it is not limited thereto, and depending on the design, only one of the driving magnet 130 and the coil 120 of the bobbin 110 may be a flat surface, and the other may be a curved surface. Alternatively, the facing surfaces of the coil 120 of the bobbin 110 and the driving magnet 130 may all be curved surfaces, and at this time, the facing surfaces of the coil 120 of the bobbin 110 and the driving magnet 130 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 a sensor, and a position sensor 180 is inserted, placed, or seated in the through-hole 141b for a sensor, 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 an outer surface of one of the four side surfaces 141 of the housing where the sensor through-hole 141b or groove is provided.

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 sensor 180 and the sensor through hole 141b or groove may be 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 . Also, the position detection sensor 180 may be a Hall sensor. However, this is an example, and this 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 can be used. For example, a method using a photo reflector or the like is also possible.

As shown in FIGS. 8 and 11 , the printed circuit board 170 is coupled or disposed on one side of the housing 140, and may have a mounting through hole 173 or a groove as described above. . Due to this, 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 is provided with a plurality of terminals 171, and receives external power to supply current to the coil 120 and the position sensor 180 of the bobbin 110. The number of terminals 171 formed on the printed circuit board 170 may be increased or decreased according to the types of components requiring control. On the other hand, according to this embodiment, the printed circuit board 170 may be provided with FPCB.

The plurality of terminals 171 provided on the printed circuit board 170 are arranged in a line under the printed circuit board 170 in a state where the printed circuit board 170 is mounted on one side of the housing 140. can be placed.

In addition, the plurality of terminals 171 are electrically connected to an external power source provided in an electronic device to which the lens driving device is mounted, and are electrically connected to an input terminal portion 174 into which current of the external power source is input, and to the external power source. and an output terminal 175 through which the current of the external power supply returns to the external power source after passing through the coil of the bobbin, an upper connection terminal 176 electrically connected to the upper elastic member, and electrically connected to the lower elastic member. It includes a lower terminal portion 177 for connection.

At this time, it is preferable that the input terminal unit 174 and the output terminal unit 175 are provided from the bottom of the printed circuit board 170 toward the outside. This is to secure a connection work space outside the lens driving device when the lens driving device is mounted on an electronic device.

For example, as shown in FIGS. 8 and 11 , the input terminal unit 174 is connected to the lower part by one printed circuit 174a among a plurality of printed circuits provided on the printed circuit board 170. It is electrically connected to the terminal unit 177, and the output terminal unit 175 is connected to the upper connection terminal unit 176 by another printed circuit 175a among a plurality of printed circuits provided on the printed circuit board 170. can be electrically connected to

Of course, on the contrary, the input terminal unit 174 is electrically connected to the upper connection terminal unit 176 by another printed circuit 175a among a plurality of printed circuits provided on the printed circuit board 170, The output terminal unit 175 may be configured to be electrically connected to the lower connection terminal unit 177 by one printed circuit 174a among a plurality of printed circuits provided on the printed circuit board 170 .

Here, the terminal portion 176 for upper connection and the terminal portion 177 for lower connection may be provided on an inner surface of the printed circuit board 170 . As will be described later, this is to electrically connect the upper elastic member and the lower elastic member to the upper terminal part 176 and the lower terminal part 177 for connection.

The printed circuit board 170 may include a controller that readjusts the amount of current applied to the coil 120 based on the first displacement value sensed by the displacement sensor, that is, the controller controls the printed circuit board It is mounted on (170). In addition, in another embodiment, the control unit may be mounted on a separate board without mounting on the printed circuit board 170, which may be a board on which an image sensor of a camera module is mounted or may be a separate board. .

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

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

Regarding the bobbin 110, it will be described in more detail with reference to the drawings below.

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 as leaf springs.

2 to 4, 9 and 10, the upper elastic member 150 and the lower elastic member 160 are coupled to the bobbin 110, the inner frame 151, 161 and the housing 140 ) It may include an outer frame 152, 162 coupled with the inner frame 151, 161 and a connection portion 153, 163 connecting the outer frame 152, 162.

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 when it moves upward and/or downward in the first direction in the optical axis direction through the change in position and fine deformation of the connecting parts 153 and 163.

According to this embodiment, as shown in FIG. 9 , the upper elastic member 150 elastically connects the upper part of the housing 140 and the upper part of the bobbin 110 . Also, 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 in the inner frame 151 .

The first through hole 152a is coupled to an upper frame support protrusion 144 provided on the upper surface of the housing 140, and the second through hole 151a or groove is formed 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 may be combined.

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

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

For example, the upper elastic member 150 includes a first intermediate terminal part 156 electrically connected to the terminal part 176 for upper connection of the printed circuit board 170 in the outer frame 152 . In addition, the other end line 120b of both end lines of the coil 120 may be electrically connected to the inner frame 151 of the upper elastic member 150 through a conductive means such as soldering or a soldering part. This will be described in more detail with reference to the drawings below.

As shown in FIG. 10 , the lower elastic member 160 elastically connects the lower part of the housing 140 and the lower part of the bobbin 110 . In addition, the lower elastic member 160 may have a plurality of insertion grooves 162a or holes in the outer frame 162 and a plurality of third through holes 161a or grooves in the inner frame 161. .

The insertion groove 162a or hole is coupled with the lower frame supporting protrusion 147 provided on the lower surface of the housing 140, and the third through hole 161a or groove is the 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 the insertion groove 162a or hole, and the inner frame 161 is attached to the bobbin 110 through the third through hole 161a or groove. Can be fixed and combined.

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

As shown in FIG. 10 , the lower elastic member 160 may be configured identically or substantially identically to the upper elastic member 150 . After the inner frame 161 and the outer frame 162 are coupled to the bobbin 110 and the housing 140, respectively, the position of the inner frame corresponding to both end lines of the coil 120 disposed on the bobbin 110 A solder portion may be provided, and power or current may be applied by performing a conductive connection such as soldering in the solder portion.

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. At this time, it is possible to finish the fixing work by bonding using an adhesive after fixing by thermal fusion according to the assembly sequence.

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 of the bobbin 110 and the printed circuit board 170. At least one may be provided.

For example, the lower elastic member 160 includes a second intermediate terminal 166 electrically connected to the terminal 177 for lower connection of the printed circuit board 170 in the outer frame 152 . In addition, one end line 120a of both end lines of the coil 120 may be electrically connected to the inner frame 161 of the lower elastic member 160 through a conductive means such as soldering or a soldering part. This will be described in more detail with reference to the drawings below.

12 is a schematic perspective view of the bobbin 110 according to one embodiment of this embodiment, Figure 13 is a schematic bottom perspective view of the bobbin 110 according to one embodiment of this embodiment, Figure 14 is one of this embodiment A schematic exploded perspective view of the bobbin 110 according to the embodiment, Figure 15 is a partially enlarged perspective view of Figure 14, Figure 16 is a partially enlarged bottom view of Figure 14, Figure 17 is an accommodation according to one embodiment of this embodiment It is a schematic partially enlarged perspective view of the groove 117, and FIG. 18 is a schematic longitudinal cross-sectional view of the bobbin 110 according to one embodiment of the present embodiment.

As shown in FIGS. 11 to 18 , the bobbin 110 may be installed in an inner space of the housing 140 to be reciprocally movable in an optical axis direction. A coil 120, which will be described later, is installed on the outer circumferential surface of the bobbin 110 to enable 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 mechanical interaction may cause the bobbin 110 to reciprocate in the first direction. 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. 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 screw thread may be formed on an inner circumferential surface of the bobbin 110 and a male screw thread corresponding to the screw thread may be formed on an outer circumferential surface of the lens barrel, and the lens barrel may be coupled to the bobbin 110 by screwing of the female screw thread. 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 screw coupling 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 composed of one sheet, or two or more lenses may 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. 12 , the upper support protrusion may be provided in a cylindrical shape or a prismatic shape, and may couple and fix the inner frame 151 of the upper elastic member 150 and the bobbin 110 . According to the present 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 . In this case, the upper support protrusion and the second through hole 151a or the groove may be fixed by thermal fusion or by an adhesive material 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 in which interference with neighboring parts can be avoided. That is, each upper support protrusion 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 imaginary line passing through the center of the bobbin 110. may be formed.

As shown in FIG. 13, the lower support protrusion 114 may be provided in a cylindrical shape or a prismatic shape like the upper support protrusion, and the inner frame 161 and the bobbin 110 of the lower elastic member 160 are provided. Can be combined and fixed. According to this 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 by an adhesive material such as epoxy. In addition, a plurality of lower support protrusions 114 as shown in FIG. 13 may be provided. At this time, the distance between each of the lower support protrusions 114 may be appropriately arranged within a range in which interference with neighboring parts can be avoided. 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 .

And, 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 and 163 and the bobbin 110 The elastic deformation of the connecting parts 153 and 163 may be more easily performed by removing spatial interference. In addition, the location of the upper escape groove may be disposed at the corner of the housing as in the embodiment, but may also be disposed at the side depending on the shape and/or position of the connecting portion of the elastic member.

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

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

According to this embodiment, the coil 120 may be formed in an approximately octagonal shape as shown in FIG. 14 . This corresponds to the shape of the outer circumferential surface of the bobbin 110, and the bobbin 110 may also be provided in an octagonal shape. In addition, at least four sides of the coil 120 may be provided in straight lines, and corner portions connecting these sides may be formed in round or straight lines. At this time, the portion formed as a straight line may be formed to be a surface corresponding to the driving magnet 130 . Also, a 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 straight, the corresponding side of the driving magnet 130 may be a straight line, and if the coil 120 is curved, the corresponding side of the driving magnet 130 may be curved. and may have the same curvature. Also, even if the coil 120 is curved, the corresponding side of the driving magnet 130 may be straight or vice versa.

Also, in this embodiment, the coil 120 may be wound on the outer circumferential surface of the bobbin 110 in three layers as shown in FIG. 19 . Of course, the coil 120 may be wound on the outer circumferential surface of the bobbin 110 in six layers. In this way, by winding the coil on the bobbin in three or six layers, one end line 120a of both ends of the coil is positioned at the bottom of the bobbin corresponding to the position of the lower elastic member, and among the ends of the coil The other end line 120b may be positioned on the top of the bobbin to correspond to the position of the upper elastic member. Due to this, in this embodiment, the connection points of both ends of the coil of the bobbin can be divided into the upper elastic member and the lower elastic member, so that a sufficient working space for connection between the coil and the external power source can be secured.

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, it can form electromagnetic force through electromagnetic interaction with the driving magnet 130. The electromagnetic force may move the bobbin 110.

On the other hand, the coil 120 may be configured to correspond to the driving magnet 130. As shown, the driving magnet 130 is composed of a single body and the entire surface facing the coil 120 has the same polarity. , 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 on a plane 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 a displacement sensor together with the position sensor 180 of the housing 140 described above. The magnet 190 for sensing may be fixed, arranged, or coupled to the bobbin 110 . Due to this, the sensing magnet 190 may move in the first direction by the same 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 may be arranged so that the upper direction of the bobbin 110 is the N pole and the lower direction of the bobbin 110 is the S pole. However, it is not limited thereto, and a converse configuration is also possible. In addition, the sensing magnet 190 may be divided into two in a plane perpendicular to the optical axis.

Here, as shown in FIGS. 14 to 18 , the bobbin 110 may have an accommodation groove 117 for accommodating the sensing magnet 190 on an 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 at a predetermined depth.

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

In particular, the accommodation groove 117 may be 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). Due to this, the distance between the sensing magnet 190 and the position sensor 180 is the thickness of the coil 120 and the separation distance between the coil 120 and the position sensor 180, or here the coil and the position sensor Since the distance can be further included and minimized to the distance, the magnetic force detection accuracy of the position sensor 180 can be improved.

The accommodating groove 117 has an opening 119 communicating with the accommodating groove 117 on one of the lower surface and the upper surface of the bobbin 110 . For example, as shown in FIG. 18, 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 the entrance of A magnet 190 for sensing may be inserted, disposed, or fixed through the opening 119 and separated through the opening 119 .

More specifically, as shown in FIGS. 16 to 18, the receiving groove 117 has an inner surface on which one surface of the sensing magnet 190 is supported, and a predetermined distance from the inner surface so that an adhesive can be injected. It may include an adhesive groove 117b concavely formed deeper inward.

The inner surface is one surface located in an inward direction 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 contacted or seated. to be.

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

As shown in FIG. 18, the bonding 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 adhesive groove 117b which is formed to be more deeply concave than the inner surface of the bobbin 110 on which the back surface of the sensing magnet 190 is contacted, 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 to cover the inside of the adhesive groove 117b. Since it is filled, it is possible to prevent the adhesive from overflowing in 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 ) It is possible to reduce the defect 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 at 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 may be formed deeper in an inward direction 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 adhesive 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, since the adhesive can be injected into the bonding groove 117b through the second additional groove 117a, the adhesive overflows near the opening 119 to form a coil ( 120) and other components of the bobbin 110 can be prevented from being adhered to, thus reducing the rate of defects in the lens driving device 100 during the coupling process of the sensing magnet 190.

Also, 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, the bobbin 110 and the sensing magnet 190 may be combined and fixed by injecting the adhesive into the second additional groove 117a.

Preferably, the bonding groove 117b may include at least one of the first additional groove 117c and the second additional groove 117a. That is, the bonding 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, wide surface) of the sensing magnet is supported and the outer circumferential surface (ie, the surface of the seating groove for coil) provided with the coil is It may be less than the thickness of the dragon magnet. Due to this, the magnet for sensing may be fixed in the receiving groove by the inner pressing force of the coil due to winding of the coil. In this case, there is no need to use adhesive.

As an additional embodiment, although not shown in the drawing, the bobbin 110 is symmetrical to the receiving groove 117 with respect to the center of the bobbin 110 on the outer circumferential surface facing the outer circumferential surface on which the receiving groove 117 is formed. It may further include an additional accommodation groove 117 formed on the outer circumferential surface of the bobbin 110 at the position, and a weight balance member accommodated in the additional accommodation groove 117.

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

19 is a schematic partial longitudinal sectional view of a lens driving device 100 according to an embodiment of the present embodiment, and FIG. 20 is a schematic part of an upper portion of the lens driving device 100 according to an embodiment of the present embodiment. An enlarged perspective view, FIG. 21 is a schematic partially cut-away perspective view of an upper portion of the lens driving device 100 of FIG. 20, and FIG. 22 is a perspective view of a lower portion of the lens driving device 100 according to an embodiment of the present embodiment. It is a schematic perspective view, and FIG. 23 is a schematic partially enlarged perspective view of the lower part of the lens driving apparatus 100 according to an embodiment of the present embodiment.

As shown in FIGS. 9, 10, and 19 to 23, the upper elastic member 150 includes an inner frame 151 coupled to the upper surface of the bobbin 110 and the housing 140. It includes an outer frame 152 coupled to an upper surface, and a connecting portion 153 elastically connecting the inner frame 151 and the outer frame 152 . The lower elastic member 160 includes an inner frame 161 coupled to the lower surface of the bobbin 110, an outer frame 162 coupled to the lower surface of the housing 140, and the inner frame. 161 and a connecting portion 163 that elastically connects the outer frame 162.

One end line 120a of both end lines of the coil 120 is electrically connected to the inner frame 161 of the lower elastic member 160, and the other end line of the both end lines of the coil 120 ( 120b) may be electrically connected to the inner frame 151 of the upper elastic member 150. At this time, each of the one end line 120a and the other end line 120b connects to the lower elastic member 160 through the connection parts 168 and 158 (eg, a soldering part or a soldering part, etc.). It may be electrically connected to the inner frame 161 of the inner frame 151 of the upper elastic member 150, respectively.

And, as shown in FIGS. 19 to 23, the upper elastic member 150 is electrically connected to one of the input terminal part 174 and the output terminal part 175 of the printed circuit board 170, and , The lower elastic member 160 may be electrically connected to the other terminal of the input terminal 174 and the output terminal 175 of the printed circuit board 170 . Hereinafter, for clarity of explanation, the lower elastic member 160 is electrically connected to the input terminal unit 174 and the upper elastic member 150 is electrically connected to the output member. do it with

In this case, the input terminal unit 174 may be electrically connected to the lower connection terminal unit 177 by one printed circuit 174a in the printed circuit board 170 .

The input terminal unit 174 may be provided to face outward from the bottom of the printed circuit board 170 when the printed circuit board 170 is coupled, fixed, or disposed on one side of the housing 140. .

Further, the lower terminal portion 177 for connection is provided at the same height or a different height from the lower elastic member 160 on the inner surface of the printed circuit board 170 and is electrically connected to the lower elastic member 160. It can be. Here, the lower connection terminal part 177 and the lower elastic member 160 may be connected to each other by a conductive connection means S (eg, a soldering part or a soldering part, etc.).

Also, the output terminal unit 175 may be electrically connected to the upper connection terminal unit 176 by another printed circuit 175a in the printed circuit board 170 .

The output terminal unit 175 may be provided to face outward from a lower portion of the printed circuit board 170 when the printed circuit board 170 is coupled, fixed, or disposed on one side of the housing 140. . That is, the output terminal unit 175 may be arranged side by side at the same height as the input terminal unit 174 .

Further, the upper terminal portion 176 for connection is provided at the same height or a different height from the upper elastic member 150 on the inner surface of the printed circuit board 170 and is electrically connected to the upper elastic member 150. It can be. Here, the upper connection terminal part 176 and the upper elastic member 150 may be connected to each other by a conductive connection means S (eg, a soldering part or a soldering part, etc.).

In the outer frame 152 of the upper elastic member 150, a first intermediate terminal portion for facilitating electrical contact between the upper connection terminal portion 176 and the outer frame 152 of the upper elastic member 150 ( 156) may be provided.

The first intermediate terminal portion 156 may be provided in a horizontal outward direction from the outer frame 152 of the upper elastic member 150 .

At this time, the first intermediate terminal unit 156 may be provided on one side opposite to the inner side of the printed circuit board 170 in the outer frame 152 of the upper elastic member 150 . Specifically, the first intermediate terminal unit 156 may be provided to face or come into contact with the terminal unit 176 for upper connection at a position corresponding to the position of the terminal unit 176 for upper connection of the printed circuit board 170. can

The first intermediate terminal portion 156 may be electrically connected to the terminal portion 176 for upper connection of the printed circuit board 170 by a conductive connection means S (eg, a soldering portion or a soldering portion, etc.).

At this time, preferably, the first intermediate terminal portion 156 has an end portion of the first intermediate terminal portion 156 on the same line as the outer surface of the outer frame 152 of the upper elastic member 150 or the outer frame ( 152) may be configured to be located further outside the outer surface.

The first intermediate terminal portion 156 includes cutouts 157 for limiting flow paths formed by cutting some outer portions of the outer frame 152 on both sides. That is, the outer frame 152 may include two cutouts 157 spaced apart from each other by a predetermined interval in the lateral direction, and the first intermediate terminal 156 defined by the predetermined interval.

In this way, by forming the flow path limiting cutout 157, in this embodiment, the conductive connection is made between the first intermediate terminal portion 156 of the upper elastic member 150 and the terminal portion 176 for upper connection of the printed circuit board 170. As a means, during the connection process, the flow path of the fluidic conductive material may be limited so that the fluidic conductive material (for example, a soldering solution when the connection process is soldering) flows only in the first intermediate terminal unit 156, and thereby the terminal unit. It is possible to prevent the high-temperature fluid conductive material from flowing to other parts.

In addition, the housing 140 has a first avoidance cutout 142 formed at a predetermined depth below the first intermediate terminal part 156 on the outer surface facing the inner surface of the printed circuit board 170 to provide That is, the first cutout 142 for avoidance may be formed from the upper surface of the housing 140 to a predetermined depth and a predetermined width from the lower portion of the first intermediate terminal portion 156 to the lower portion. In addition, the first avoidance cutout 142 may be formed over the outer surface of the housing 140 .

Preferably, the width of the first avoidance cutout 142 may be greater than that of the first intermediate terminal portion 156 .

In this way, by providing the first avoidance cutout 142, the present embodiment provides a gap between the first intermediate terminal portion 156 of the upper elastic member 150 and the terminal portion 176 for upper connection of the printed circuit board 170. The conductive connection means can prevent the outer surface of the housing 140 from melting due to heat emitted from a fluid conductive material (for example, a soldering liquid when the connection process is soldering) during a connection process. That is, the first intermediate terminal portion 156, which receives high-temperature heat from the fluidic conductive material, and a part of the outer surface of the housing 140 are spatially separated, and at the same time, fluid conduction is performed under the first intermediate terminal portion 156. It is possible to form an air cooling space of the material, which occurs during a connection process between the first intermediate terminal portion 156 of the upper elastic member 150 and the terminal portion 176 for upper connection of the printed circuit board 170. It is possible to significantly reduce the defect rate of the housing 140, which can be.

In the outer frame 162 of the lower elastic member 160, a second intermediate terminal portion for facilitating electrical contact between the lower connection terminal portion 177 and the outer frame 162 of the lower elastic member 160 ( 166) may be provided.

The second intermediate terminal portion 166 may be provided in a horizontal outward direction from the outer frame 162 of the lower elastic member 160 .

At this time, the second intermediate terminal unit 166 may be provided on one side facing the inner side of the printed circuit board 170 in the outer frame 162 of the lower elastic member 160 . Specifically, the second intermediate terminal portion 166 may be provided to face or contact the lower connection terminal portion 177 at a position corresponding to the position of the lower connection terminal portion 177 of the printed circuit board 170. can

The second intermediate terminal unit 166 may be electrically connected to the terminal unit 177 for lower connection of the printed circuit board 170 by a conductive connection unit S (eg, a soldering unit or a soldering unit).

At this time, preferably, the second intermediate terminal portion 166 has an end portion of the second intermediate terminal portion 166 on the same line as the outer surface of the outer frame 162 of the lower elastic member 160 or the outer frame ( 162) may be configured to be located further outside the outer surface.

The second intermediate terminal portion 166 includes cutouts 167 for limiting flow paths formed by cutting some outer portions of the outer frame 162 on both sides. That is, the outer frame 162 may include two cutouts 167 spaced apart from each other by a predetermined interval in the lateral direction and the second intermediate terminal 166 defined by the predetermined interval.

In this way, by forming the cutout 167 for limiting the passage, in this embodiment, a conductive connection is made between the second intermediate terminal portion 166 of the lower elastic member 160 and the terminal portion 177 for lower connection of the printed circuit board 170. As a means, during the connection process, the flow path of the fluidic conductive material may be limited so that the fluidic conductive material (for example, a solder solution in case of soldering) flows only in the second intermediate terminal unit 166, and thereby the terminal unit. It is possible to prevent the high-temperature fluid conductive material from flowing to other parts.

In addition, the housing 140 has a second avoidance cutout 145 formed at a predetermined height on the upper part of the second intermediate terminal part 166 on the outer surface opposite to the inner surface of the printed circuit board 170 to provide That is, the second cutout 145 for avoidance may be formed on the lower surface of the housing 140 to a predetermined height and a predetermined width in an upward direction from the upper portion of the second intermediate terminal portion 166 . In addition, the second avoidance cutout 145 may be formed over the outer surface of the housing 140 .

Preferably, the width of the second avoidance cutout 145 may be greater than that of the second intermediate terminal portion 166 .

In this way, by providing the second avoidance cutout 145, the present embodiment provides a gap between the second intermediate terminal portion 166 of the lower elastic member 160 and the terminal portion 177 for lower connection of the printed circuit board 170. The conductive connection means can prevent the outer surface of the housing 140 from melting due to heat emitted from a fluid conductive material (for example, a soldering liquid when the connection process is soldering) during a connection process. That is, the second intermediate terminal portion 166, which receives high-temperature heat from the fluidic conductive material, and a part of the outer surface of the housing 140 are spatially separated, and at the same time, the upper portion of the second intermediate terminal portion 166 conducts fluidity. It is possible to form an air-cooling space for materials, which occurs during a connection process between the second intermediate terminal portion 166 of the lower elastic member 160 and the terminal portion 177 for lower connection of the printed circuit board 170. It is possible to significantly reduce the defect rate of the housing 140, which can be.

According to this embodiment, the process of inputting and outputting external power to the coil 120 is as follows.

First, the supply current of the external power passes through the input terminal part 174 of the printed circuit board 170, and then via one printed circuit 174a of the printed circuit board 170 and the terminal part 177 for lower connection. It may be supplied to the second intermediate terminal portion 166 of the outer frame 162 of the lower elastic member 160 . Thereafter, the supply current passes through the outer frame 162, the connecting portion 163, and the inner frame 161 of the lower elastic member 160 from the second intermediate terminal portion 166 to one end line of both ends of the coil 120. (120a) may be supplied. Thereafter, after passing through all of the coils 120, the supply current flows to the inner frame of the upper elastic member 150 through the other end line 120b of both end lines of the coil 120. Thereafter, the supply current flows to the inner frame 151 of the upper elastic member 150, the connecting portion 153, and the first intermediate terminal portion 156 of the outer frame 152. Thereafter, the supply current passing through the first intermediate terminal portion 156 passes through the terminal portion 176 for upper connection of the printed circuit board 170 and another printed circuit 175a, and then the output terminal portion of the printed circuit board 170 ( 175) to return to the external power source.

According to the above-described problem solving means, the present embodiment divides both ends of the coil up and down and electrically connects them to the printed circuit board through the upper elastic member and the lower elastic member, thereby using the printed circuit board as an intermediate connecting means, resulting in An external power source can be electrically connected to the coil. Due to this, in this embodiment, the connection points of both ends of the coil of the bobbin can be divided into the upper elastic member and the lower elastic member, so that a sufficient working space for connection between the coil and the external power source can be secured.

In addition, in this embodiment, the upper elastic member and the lower elastic member are coiled without adding a separate structure to the upper elastic member and the lower elastic member by simply forming the cutout for limiting the passage in the outer frame of the upper elastic member and the lower elastic member. It can be used as an intermediate connecting means of Due to this, the present embodiment can secure a working space for connection between the bobbin coil and an external power source supplying current to the coil without increasing the manufacturing cost of the upper elastic member and the lower elastic member.

In addition, the present embodiment can prevent a fluid conductive material (for example, a soldering liquid when the connection process is soldering) from flowing to parts other than the terminal unit during a connection process between the coil and an external power source. Due to this, the present embodiment can prevent melting or damage of a base material such as a housing or a printed circuit board due to a high-temperature fluid conductive material generated during the connection process, thereby significantly reducing the defect rate of the lens driving device. .

In addition, in this embodiment, the camera module may further include a camera module control unit, and the first displacement value calculated based on the current change value detected by the displacement detection unit and the lens according to the distance between the subject and the lens. Compare focal lengths. 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 each other, so that the bobbin 110 may be moved by a second displacement amount in the first direction. In addition, the displacement detection unit is configured for the sensing according to the first direction movement of the sensing magnet 190 fixedly coupled to the bobbin 110, which is a movable position sensor 180 fixedly coupled to the housing 140, which is a fixed body. The current position of the bobbin 110 or the first displacement amount in a separate driver IC or the camera module control unit based on the current change amount output based on the detected change amount of magnetic force by detecting the change in 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 sensor is transmitted to the control unit of the printed circuit board 170, and the control unit re-determines the position of the bobbin 110 for auto focusing to coil ( 120) to adjust the amount of applied current.

Although illustrated and described as a specific embodiment to illustrate the technical idea of the present embodiment above, this embodiment is not limited to the same configuration and operation as the specific embodiment as described above, and various modifications do not deviate from the scope of the present embodiment. can be carried out within Accordingly, such modifications should be regarded as belonging to the scope of the present embodiment, and the scope of the present embodiment should be determined by the claims described later.

100: lens driving device
110: bobbin
120: coil
130: driving magnet
140: housing
150: upper elastic member
160: lower elastic member
170: printed circuit board
180: position detection sensor
190: magnet for sensing
210: base
300: cover member

Claims (12)

housing;
a driving magnet disposed in the housing;
a bobbin disposed within the housing;
a coil disposed on the bobbin;
an upper elastic member and a lower elastic member connected to the housing and the bobbin;
a printed circuit board disposed on one side of the housing; and
Including a sensing magnet disposed on the bobbin,
The bobbin includes an adhesive groove for accommodating an adhesive between the sensing magnet and the bobbin,
The sensing magnet is disposed between the coil and the adhesive lens driving device. The lens driving device of claim 1 , wherein the bobbin includes an accommodating groove accommodating the sensing magnet, and the accommodating groove communicates with the adhesive groove. The lens driving device of claim 2 , wherein the bonding groove is deeper than the accommodating groove. According to claim 1,
The sensing magnet includes a first surface to which the adhesive is attached and a second surface opposite to the first surface. According to claim 4,
The second surface faces the coil in a direction perpendicular to the optical axis. According to claim 4,
The sensing magnet includes a third surface connecting the first surface and the second surface and exposed from the bobbin in an optical axis direction. According to claim 1,
At least one surface included in the sensing magnet is exposed on one of the upper and lower surfaces of the bobbin. According to claim 1,
The lower elastic member includes a first elastic member and a second elastic member spaced apart from each other,
A first end of the coil is connected to the first elastic member, and a second end different from the first end of the coil is connected to the second elastic member. The lens driving device of claim 8 , wherein the first elastic member and the second elastic member are connected to the printed circuit board. According to claim 1,
The sensing magnet is a lens driving device facing the printed circuit board in a direction perpendicular to the optical axis. According to claim 1,
The coil is a lens driving device disposed between the sensing magnet and the printed circuit board. housing;
a driving magnet disposed in the housing;
a bobbin disposed within the housing;
a coil disposed on the bobbin; and
A lens driving device comprising an upper elastic member and a lower elastic member connected to the housing and the bobbin.

Images