KR102344456B1 - Lens moving unit and camera module including the same - Google Patents

Abstract

The lens driving device of the embodiment includes a bobbin on which at least one lens is mounted, a first coil and a driving magnet that face each other to move the bobbin in the optical axis direction of the at least one lens, and a driving magnet; A first circuit board and a bobbin for supplying current to be used, a magnet for driving, and a cover can and a base that are coupled, contacted, supported, fixed, or temporarily fixed to each other to form a space for accommodating the first circuit board, the cover comprising: The can is electrically connected to the second circuit board on which the image sensor is mounted.

Description

Lens moving unit and camera module including the same}

The embodiment relates to a lens driving device and a camera module including the same.

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 digital camera is being actively conducted. Accordingly, a camera module having a digital camera is required to provide various functions such as auto-focusing, shutter, shake improvement or zoom function, etc., while it is in the trend of high-pixel and miniaturization.

On the other hand, there is a demand for shielding electromagnetic interference (EMI: Electromagnetic Interference) including electrical noise generated from components such as a coil or a sensor included in a conventional camera module.

The embodiment provides a lens driving device capable of shielding electromagnetic interference and a camera module including the same.

A lens driving device according to an embodiment includes: a bobbin to which at least one lens is mounted; a first coil facing and interacting with each other to move the bobbin in an optical axis direction of the at least one lens and a driving magnet; a first circuit board for supplying a current required by the first coil; and a cover can and a base that are coupled, contacted, supported, fixed, or temporarily fixed to each other to form a space accommodating the bobbin, the driving magnet, and the first circuit board, wherein the cover can includes an image sensor It may be electrically connected to the mounted second circuit board.

The first circuit board may include an EMI shielding terminal electrically connecting the cover can and the second circuit board.

Alternatively, the cover can may include at least one can protrusion that protrudes in a first direction parallel to the optical axis and is electrically connected to the second circuit board. The base may include a protrusion groove in which the at least one can protrusion is mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed. The at least one can protrusion and the second circuit board may be electrically connected to each other by solder, conductive epoxy, or welding.

The lens driving device may further include a housing member that supports the driving magnet and the first circuit board and is coupled, seated, contacted, fixed, supported, or multiplied by the base.

The first circuit board may be disposed under the housing member.

The lens driving device may further include a displacement detection unit configured to sense a first displacement value of the bobbin in the optical axis direction, and the first circuit board may be mounted, inserted, seated, or contacted on an outer surface of one side of the housing member. , coupled, fixed, supported, or disposed.

The housing member is formed on the one side surface on which the first circuit board is mounted, inserted, seated, contacted, coupled, fixed, supported, or disposed to form a through hole for a sensor into which the displacement sensing unit is inserted, disposed, or seated. can have

The lens driving device may further include a sensing magnet disposed at a position corresponding to the displacement detecting unit and the through hole for the sensor.

The terminal for EMI shielding may be plated with gold.

The material of the cover can may include a metal.

The first circuit board may include an I ² C communication terminal; and a power terminal receiving external power.

The cover can may be a yoke cover can.

A lens driving device according to another embodiment includes: a bobbin on which at least one lens is mounted; a coil and a driving magnet that face each other and interact with each other so as to move the bobbin in an optical axis direction of the at least one lens; a first circuit board for supplying a current required by the coil; a cover can and a base coupled to each other to form a space accommodating the bobbin, the driving magnet, and the first circuit board; and a cover wrapped by the cover can, fixedly supporting the bobbin, and coupled with the driving magnet therein, wherein the cover may be electrically connected to the second circuit board on which the image sensor is mounted.

The first circuit board may include an EMI shielding terminal electrically connecting the cover and the second circuit board.

The EMI shielding terminal may include an upper terminal part electrically connected to the cover can or the cover; and a lower terminal part electrically connected to the second circuit board and the upper terminal part. The EMI shielding terminal may further include an intermediate terminal part disposed between the upper terminal part and the lower terminal part and electrically connecting the upper and lower terminal parts.

The upper terminal part may be soldered, conductive epoxy, or welded to the cover can or cover, and the lower terminal part may be soldered, conductive epoxy, or welded to the second circuit board.

A camera module according to another embodiment includes the image sensor; the second circuit board on which the image sensor is mounted; and the lens driving device according to any one of claims 1 to 16.

The lens driving device and the camera module including the same according to the embodiment have an effect of shielding electromagnetic interference including electrical noise generated by coils or various sensors by electrically connecting the cover can or the cover to the second circuit board. have

1 is a schematic perspective view of a lens driving device according to an exemplary embodiment.
FIG. 2 is a schematic exploded perspective view showing an embodiment of the lens driving device illustrated in FIG. 1 .
3 is a schematic perspective view of a lens driving device in which a cover can is removed in FIG. 1 according to an embodiment.
4 is a schematic plan perspective view of a housing member according to an embodiment.
5 is a schematic bottom perspective view of a housing member according to an embodiment.
6 is a schematic exploded perspective view of a driving magnet, a housing member, a first circuit board, and a displacement sensor according to an exemplary embodiment.
7 is a plan perspective view of an upper elastic member according to an embodiment.
8 is a plan perspective view of a lower elastic member according to an embodiment.
9 is a cross-sectional view taken along the line I-I' shown in FIG. 1 and viewed in the positive x-axis direction.
FIG. 10 is an enlarged cross-sectional view of part 'A' shown in FIG. 9 .
11 is a partial perspective view of the lower left part of the resultant cut along the line II-II' shown in FIG. 1 .
12 is a schematic perspective view of a lens driving device according to another exemplary embodiment in which a lens is mounted.
13 is a plan perspective view showing an embodiment of the bobbin shown in FIG. 2 .
14 is a bottom perspective view of the bobbin shown in FIG. 2 according to an embodiment.
15 is an exploded perspective view of a bobbin, a first coil, a displacement sensing unit, and a sensing magnet according to an exemplary embodiment.
16 is a schematic bottom perspective view of a bobbin, a first coil, first and second driving magnets, a displacement sensing unit, and a sensing magnet according to an exemplary 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 may be noted that the reference numbers indicated for the configuration 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 may be omitted. In addition, certain features presented in the drawings are enlarged, reduced, or simplified for ease of explanation, and the drawings and components thereof are not necessarily drawn to scale. However, those skilled in the art will readily appreciate these details.

Hereinafter, the embodiment illustrated in FIGS. 1 to 16 will be described using a Cartesian coordinate system (x, y, z), but the embodiment is not limited thereto. That is, it goes without saying that the embodiment can be described using another coordinate system. In each drawing, the x-axis and the y-axis mean a plane perpendicular to the optical axis. For convenience, the z-axis direction as the optical axis direction may be referred to as the first direction, the x-axis direction may be referred to as the second direction, and the y-axis direction may be referred to as the third direction. .

1 is a schematic perspective view of a lens driving device 100A according to an embodiment, FIG. 2 is a schematic exploded perspective view of the lens driving device 100A illustrated in FIG. 1 according to an embodiment, and FIG. 3 is 1 shows a schematic perspective view of the lens driving device 100A from which the cover can 102a is removed according to an embodiment.

The lens driving device 100A according to the embodiment is a device that adjusts a distance between a lens (not shown) and an image sensor (not shown) in a camera module so that the image sensor is positioned at a focal length of the lens. That is, the lens driving device 100A is a device that performs an auto-focusing function.

1 to 3 , the lens driving device 100A according to the embodiment includes a cover can 102a, a bobbin 110, a first coil 120, a driving magnet 130, and a housing member. 140 , an upper elastic member 150 , a lower elastic member 160 , a first circuit board 170 , a displacement detecting unit 180 , a sensing magnet 182 , and a base 190a may be included. .

The cover can 102a may be in the form of a box as a whole, and may be configured to be mounted, seated, contacted, fixed, temporarily fixed, supported, coupled, or disposed on the upper portion of the base 190a. The cover can (102a) is mounted, seated, contacted, fixed, temporarily fixed, supported, combined, or disposed on the base (190a) in the receiving space formed by the bobbin 110, the first coil 120, and the driving magnet 130 ), the housing member 140 , the upper elastic member 150 , the lower elastic member 160 , the first circuit board 170 , the displacement detecting unit 180 , and the sensing magnet 182 may be accommodated therein.

The cover can 102a may include an opening 101 on its upper surface through which a lens (not shown) coupled to the bobbin 110 may be exposed to external light. In addition, a window made of a light-transmitting material may be provided in the opening 101 to prevent foreign substances such as dust or moisture from penetrating into the camera module.

The cover can 102a may include a first groove portion 104 formed in a lower portion, and the base 190a may include a second groove portion 192 formed in an upper portion thereof. At this time, as will be described later, when the cover can 102a is mounted, seated, contacted, fixed, temporarily fixed, supported, coupled, or disposed on the base 190a, the portion in contact with the first groove portion 104 (that is, A second groove 192 may be formed in a position corresponding to the first groove 104 . A concave portion having a predetermined area may be formed by contacting, disposing, or combining the first groove portion 104 and the second groove portion 192 . An adhesive member having a viscosity, for example, epoxy may be injected into the groove and applied thereto. That is, the adhesive member applied to the groove fills a gap between the surfaces facing each other of the cover can 102a and the base 190a through the groove, so that the cover can 102a is mounted on the base 190a. , can be seated, contacted, fixed, temporarily fixed, supported, coupled, or disposed while sealing between the cover can 102a and the base 190a, and the cover can 102a is mounted on the base 190a, The sides may be closed or coupled while seated, contacted, fixed, temporarily fixed, supported, coupled, or disposed.

In addition, the cover can 102a may further include a third groove portion 106 . Here, the third groove portion 106 is formed on a surface corresponding to the terminal surface of the first circuit board 170 so that the plurality of terminals 171 formed on the terminal surface and the cover can 102a do not interfere with each other. The third groove portion 106 may be concavely formed on the entire surface facing the terminal surface of the first circuit board 170, and an adhesive member is applied to the inside of the third groove portion 106 to cover the can 102a and the cover can 102a. The base 190a and the first circuit board 170 may be sealed or coupled.

The first groove portion 104 and the third groove portion 106 are formed in the cover can 102a, and the second groove portion 192 is formed in the base 190a, but the embodiment is not limited thereto. That is, according to another embodiment, the first to third grooves 104 , 192 , and 106 may be formed only on the base 190a or only on the cover can 102a.

In addition, the material of the above-described cover can 102a may include metal, but the embodiment is not limited to the material of the cover can 102a. In addition, the cover can may be formed of a magnetic material.

The base 190a may be provided in a rectangular shape as a whole, and may include a stepped portion protruding outward with a predetermined thickness to surround the lower edge of the base 190a. The stepped portion may be in the form of a continuous band or some intermittent band in the middle. The predetermined thickness of the stepped portion is the same as the side thickness of the cover can 102a, and when the cover can 102a is mounted, seated, contacted, fixed, temporarily fixed, supported, coupled, or disposed on the base 190a, the cover can The side of the step 102a may be mounted, seated, contacted, coupled, fixed, supported, or disposed on the upper or side surface of the stepped portion. For this reason, the cover can 102a coupled to the upper side of the stepped portion may be guided by the stepped portion, and an end of the cover can 102a may be coupled to make surface contact with the stepped portion. Here, the end of the cover can 102a may include a bottom surface or a side surface. In this case, the stepped portion and the end of the cover can 102a may be adhesively fixed or bonded or sealed by an adhesive or the like.

In the stepped portion, a second groove portion 192 may be formed at a position corresponding to the first groove portion 104 of the cover can 102a. As described above, the second groove portion 192 may be combined with the first groove portion 104 of the cover can 102a to form a groove portion, and may form a space in which the adhesive member is filled.

Like the cover can 102a, the base 190a may include an opening near the center. The opening may be formed at a position corresponding to the position of the image sensor disposed in the camera module.

In addition, the base 190a may include four guide members 194 protruding at right angles to a predetermined height in the upper direction from the four corners. The guide member 194 may have a polygonal prism shape. The guide member 194 may be mounted, inserted, seated, contacted, coupled, fixed, supported, or disposed in a lower guide groove 148 of the housing member 140 to be described later. In this way, due to the guide member 194 and the lower guide groove 148, when the housing member 140 is mounted, seated, contacted, coupled, fixed, supported, or disposed on the upper portion of the base 190a, the base 190a ), the position of the coupling of the housing member 140 may be guided, and the coupling area may be widened, and the housing member 140 may be coupled due to vibration or the like during the operation process of the lens driving device 100A. During the process, it can be prevented from being deviated from the reference position to be mounted due to the operator's mistake.

4 is a schematic plan perspective view of a housing member 140 according to an embodiment, FIG. 5 is a schematic bottom perspective view of the housing member 140 according to an embodiment, and FIG. 6 is a driving unit according to an embodiment. A schematic exploded perspective view of the magnet 130 , the housing member 140 , the first circuit board 170 , and the displacement sensing unit 180 is shown, and FIG. 7 is a plan perspective view of the upper elastic member 150 , FIG. 8 shows a plan perspective view of the lower elastic member 160 .

4 to 6 , the housing member 140 may have an overall hollow column shape (eg, a hollow quadrangular column shape as illustrated). The housing member 140 has a shape to support at least two or more driving magnets 130 and the first circuit board 170 , and the bobbin 110 therein has a first direction z with respect to the housing member 140 . The bobbin 110 may be accommodated so as to be movable in the axial direction.

The housing member 140 may include four flat sides 141 . The side surface 141 of the housing member 140 may have an area corresponding to or larger than that of the driving magnet 130 .

As shown in FIG. 6 , a driving magnet 130 is mounted, inserted, seated, contacted, coupled, fixed, supported, or A through hole (or groove) 141a for a magnet that may be disposed may be formed. The through-hole 141a for the magnet may have a size and/or a shape corresponding to the driving magnet 130 , and may also have a shape capable of guiding the driving magnet 130 . One of the driving magnets 130 (hereinafter, 'first driving magnet 131') and the other one (hereinafter, 'second driving The magnets 132') may be mounted, inserted, seated, contacted, coupled, fixed, supported, or disposed, respectively. In the case of the embodiment, only two driving magnets 130 are shown, but the embodiment is not limited thereto. That is, of course, four driving magnets 130 may be disposed.

The type of the driving magnet 130 described above can be broadly divided into ferrite, alnico, rare earth magnet, etc. can be classified. The embodiment is not limited to the type of the driving magnet 130 .

In addition, a displacement sensing unit 180 to be described later is mounted, inserted, seated, contacted, combined, on one side or other surfaces other than the first both sides perpendicular to the first both sides among the four side surfaces 141 of the housing member 140 , A through hole 141b or a groove (not shown) for a sensor to be fixed, supported, or disposed may be formed. The sensor through-hole 141b may have a size and shape corresponding to a displacement sensing unit 180 to be described later, and may be formed to be spaced apart from the first and second magnet through-holes 141a and 141a' by a predetermined distance. The sensor through-hole 141b may be formed in a side surface on which the first circuit board 170 is mounted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed among the side surfaces 141 of the housing member 140 . have.

In addition, on one side of the housing member 140, at least one or more mounting protrusions 149 for enabling the first circuit board 170 to be mounted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed. can be provided.

The mounting protrusion 149 may be mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed in the mounting through-hole 173 formed in the first circuit board 170 . At this time, the mounting through-hole 173 and the mounting protrusion 149 may be contacted or coupled in a shape fitting method or an interference fitting method, but these 173 and 149 are the first circuit board 170 in the housing. Mounting, seating, contact, coupling, fixing, temporarily fixing, supporting, or disposed on the member 140 may be a simple guide.

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

Although not shown, through-holes for the third and fourth magnets may be additionally disposed on the second side surfaces of the housing member 140 that are perpendicular to the first side surfaces.

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 first both sides of the housing member 140 It may have a lateral length. On the other hand, the third through-hole for the magnet and the fourth through-hole for the magnet have the same size and the same shape as each other, and have a lateral length than the first through-hole (141a) for the magnet and the through-hole (141a') for the second magnet. can be made small. This is to secure a space for the sensor through-hole 141b since the sensor through-hole 141b must be formed on the second both side surfaces where the third or fourth through-hole for the magnet is formed.

The first driving magnet 131 and the second driving magnet 132 have the same size and shape as each other, and having substantially the same lateral length over the entire lateral length of the first both sides of the housing member 140 is described above. It's like a bar. And, the third and fourth driving magnets (not shown) that can be mounted, inserted, seated, contacted, combined, fixed, temporarily fixed, supported, or disposed in the through-holes (not shown) for the third and fourth magnets, respectively. ) may have the same size and the same shape as each other, and may be formed to have a smaller lateral length than the first driving magnet 131 and the second driving magnet 132 .

Here, like the first and second magnet through-holes 141a and 141a ′, the third and fourth magnet through-holes may be symmetrically disposed on a straight line with respect to the center of the housing member 140 . That is, the third and fourth driving magnets (not shown) may be symmetrically disposed on a straight line with respect to the center or the center of the housing member 140 .

If the first and second driving magnets 131 and 132 or the third and fourth driving magnets are disposed to face each other while being biased to one side regardless of the center of the housing member 140, the bobbin 110 Since electromagnetic force acts on one side of the first coil 120 to be biased, there may be a possibility that the bobbin 110 is tilted. In other words, similarly to the first and second driving magnets 131 and 132 , by disposing the third and fourth driving magnets symmetrically on a straight line with respect to the center of the housing member 140 , the bobbin 110 . And it is possible to apply an unbiased electromagnetic force to the first coil 120 , so that the bobbin 110 moves in the first direction can be easily and accurately guided.

Hereinafter, for convenience of description, it is assumed that the lens driving device 100A according to the embodiment has only the first and second driving magnets 131 and 132 , but even when further including the third and fourth driving magnets, the following The description of can be applied.

A plurality of first stoppers 143 may protrude from the upper surface of the housing member 140 . The first stopper 143 is to prevent collision between the cover can 102a and the housing member 140 body, and when an external shock occurs, the upper surface of the housing member 140 is on the upper inner surface of the cover can 102a. Direct collisions can be avoided. In addition, the first stopper 143 may also serve to guide the installation position of the upper elastic member 150 . For example, referring to FIGS. 3 and 7 , a guide groove 155 having a shape corresponding to a position corresponding to that of the first stopper 143 in the upper elastic member 150 may be formed.

In addition, a plurality of upper frame support protrusions 144 in which the outer frame 152 of the upper elastic member 150 is inserted, seated, contacted, fixed, temporarily fixed, coupled, supported, or disposed on the upper side of the housing member 140 . may be formed to protrude. A first through hole (or groove) 152a 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 . The upper frame support protrusion 144 may be fixed by adhesive or fusion after being inserted, seated, contacted, fixed, temporarily fixed, combined, supported, or disposed in the first through hole 152a, and the fusion is thermal fusion or ultrasonic fusion. and the like.

In addition, 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 member 140 . The lower frame support protrusion 147 may be formed at four lower corners of the housing member 140 , respectively. Meanwhile, referring to FIG. 8 , the outer frame 162 of the lower elastic member 160 at a position corresponding to the lower frame support protrusion 147 is mounted, inserted, seated, contacted, coupled to the lower frame support protrusion 147 . , fixed, temporarily fixed, supported, or a fastening portion 162a that may be disposed may be formed, which may be fixed with an adhesive or fusion bonding, and the fusion may include thermal fusion or ultrasonic fusion bonding.

In addition, the housing member 140 may be a yoke housing member capable of performing a yoke function. In the yoke housing member structure, the structure may be formed to be spaced apart from the inner surface of the upper elastic member 140 and the upper surface of the yoke. This is to prevent the movement of the bobbin 110 in the upward direction and interference with the yoke.

Alternatively, the yoke (not shown) itself may serve as the housing member 140 . In this case, the yoke may be coupled to the base 190a, and the upper elastic member 150 may be disposed under the yoke or inside the yoke.

According to another embodiment, a separate cover may be further disposed on the upper portion of the yoke. In this case, the upper elastic member 150 may be disposed above the yoke or between the yoke and the cover, and the upper elastic member 150 may be coupled to the cover or the yoke.

Meanwhile, the driving magnets 130: 131 and 132 may be fixed to the magnet through-holes 141a and 141a' with an adhesive, but the present invention 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 (not shown) may be formed on the inner surface of the housing member 140 instead of the through-holes 141a and 141a ′ for the first and second magnets, unlike shown in the drawings. In addition, the magnet seating portion may have a size and shape corresponding to the size and shape of the driving magnet 130 .

The driving magnet 130 may be installed at a position facing the first coil 120 located on the outer peripheral surface of the bobbin 110 . In addition, the driving magnet 130 may be configured separately as shown, or may be configured as a single body as shown. In one embodiment, the driving magnet 130 may be disposed such that the surface facing the first coil 120 of the bobbin 110 is the N pole and the outer surface is the 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. That is, the driving magnet 130 is a positively polarized magnet, and is composed of a first magnet (not shown) and a second magnet (not shown) disposed to face each other with a non-magnetic barrier rib interposed therebetween in a plane perpendicular to the optical axis. can Here, the non-magnetic barrier rib may be air or a non-magnetic material. The first and second magnets may be disposed to have opposite polarities, but embodiments are not limited thereto and may have various shapes.

The first and second driving magnets 131 and 132 are configured in a rectangular parallelepiped shape having a predetermined width, and are seated in the first and second through-holes 141a and 141a' for the first and second driving magnets, respectively. A wide surface or a partial surface of the magnets 131 and 132 may form a part of a side surface (outer surface or inner surface) of the housing member 140 . In addition, the first and second driving magnets 131 and 132 may be disposed on the side surface of the housing member 140 and at the same time disposed or coupled to the inner surface of the yoke as described above. It may be coupled or fixed to the side. In this case, the driving magnets 131 and 132 facing each other may be installed parallel to each other. In addition, the opposite surfaces of the driving magnet 130 and the first 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 second coil 120 of the bobbin 110 may be flat, and the other may be configured as a curved surface, depending on the design. Alternatively, the first coil 120 of the bobbin 110 and the opposite surfaces of the driving magnet 130 may all have curved surfaces, in this case, the first coil 120 of the bobbin 110 and the driving magnet 130 ) may be formed to have the same curvature of opposite surfaces.

In addition, as described above, one side of the housing member 140 is provided with a through-hole 141b or a groove for the sensor, and the displacement sensing unit 180 is mounted, inserted, and installed in the through-hole 141b or groove for the sensor. Seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed, and the displacement sensing unit 180 may be electrically coupled to one surface of the first circuit board 170 by soldering or soldering. In other words, the first circuit board 170 is mounted, inserted, seated, contacted, coupled to the outer surface of one side provided with the sensor through-hole 141b or groove among the four side surfaces 141 of the housing member 140 . , fixed, temporarily fixed, supported, or disposed.

The displacement detecting unit 180 may sense/determine a first displacement value of the bobbin 110 in the first direction together with a sensing magnet 182 to be described later. To this end, the displacement detecting unit 180 and the sensor through hole 141b or groove may be disposed at a position corresponding to the sensing magnet 182 . As shown, the sensing magnet 182 may be divided into upper and lower two in order to increase the strength of the magnetic field, but the embodiment is not limited thereto.

The displacement detecting unit 180 may be a sensor detecting a change in magnetic force emitted from the sensing magnet 182 of the bobbin 110 . For example, the displacement sensor 180 may be a Hall sensor, but the embodiment is not limited thereto. According to another embodiment, any sensor capable of detecting a change in magnetic force other than a Hall sensor may be used as the displacement detecting unit 180, and any sensor capable of detecting a position other than magnetic force is possible, yes For example, a method using a photoreflector or the like is also possible. When the displacement sensing unit 180 is implemented as a Hall sensor, calibration of the actuator driving distance may be additionally performed based on the Hall voltage difference with respect to the change in the magnet flux (ie, magnetic flux density) detected by the Hall sensor. . For example, when the displacement sensor 180 is implemented as a Hall sensor, the Hall sensor 180 may have a plurality of pins. For example, the plurality of pins may include first and second pins. The first pin may include pins 1-1 and 1-2 respectively connected to voltage and ground, and the second pin may include pins 2-1 and 2-2 outputting the sensed result. can Here, the sensed result output through the 2-1 and 2-2 pins may be in the form of a current, but the embodiment is not limited to the form of a signal. The first circuit board 170 is connected to the Hall sensor 180 to supply power to the 1-1 and 1-2 pins and to receive signals from the 2-1 and 2-2 pins.

The first circuit board 170 may be mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed on one side of the housing member 140 . In this case, the installation position of the first circuit board 170 may be guided by the mounting protrusion 149 formed on one side of the housing member 140 as described above. One or a plurality of mounting protrusions 149 may be formed, and when two or more are formed, it may be easier to guide the arrangement position of the first circuit board 170 .

In addition, the first circuit board 170 is provided with a plurality of terminals 171 , and may supply current required by the first coil 120 and the displacement sensor 180 of the bobbin 110 by receiving external power. . The number of terminals 171 formed on the first circuit board 170 may increase or decrease according to the types of components that need to be controlled. For example, the plurality of terminals 171 of the first circuit board 170 may include power terminals 171b and 171c receiving external power and I ² C communication terminals 171d and 171e. Here, the power terminal 171b may be a terminal connected to the supply voltage, and the power terminal 171c may be a terminal connected to the ground.

Also, referring to FIGS. 3 and 6 , at least one pin 172 may be provided on the first circuit board 170 . As shown, there may be four pins 172, but the number of pins 172 may be more or less than four. For example, the four pins 172 may be a test pin, a hole pin, a VCM+ pin, and a VCM- pin, but the embodiment is not limited to the type of these pins. Here, the test pin may be a pin used to evaluate the performance of the lens driving apparatuses 100A and 100B. The Hall pin may be a pin used to retrieve data output from the displacement sensor 180 . The VCM+ pin and the VCM- pin may be pins used to evaluate the performance of the lens driving devices 100A and 100B in a state where feedback is not received from the displacement sensor 180 .

According to an embodiment, the first circuit board 170 may be formed of an FPCB. The first circuit board 170 may include a controller (not shown) that readjusts the amount of current applied to the first coil 120 based on the first displacement value sensed by the displacement sensor 180 . For example, the controller may receive signals from pins 2-1 and 2-2 of the Hall sensor 180 . The controller may be mounted on the first circuit board 170 . Alternatively, according to another embodiment, the control unit may not be mounted on the first circuit board 170 but may be mounted on a separate board. Here, the other separate board may be a second circuit board (not shown) on which an image sensor (not shown) is mounted in the camera module, or may be a separate board.

In the above example, it has been described that the lens driving apparatus 100A includes the displacement detection unit 180 , but in some cases, the displacement detection unit 180 may be omitted.

In addition, in the above example, the first circuit board 170 has been described as being mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed on the outer surface of the housing member 140 , but in the embodiment is not limited thereto. That is, according to another exemplary embodiment, when the lens driving device 100A does not include the displacement detecting unit 180 , the first circuit board 170 is formed of the housing member 140 instead of the outer surface of the housing member 140 . It may be located below.

Meanwhile, in order to shield electromagnetic interference (EMI), the cover can 102a may be electrically connected to the second circuit board on which the image sensor is mounted. Here, the EMI may include electromagnetic noise that may be generated by the first coil 120 or a Hall sensor implementing the displacement detecting unit 180 . Since each part of the lens driving device 100A may malfunction or be damaged due to the EMI, the cover can 102a may be electrically connected to the second circuit board in order to shield it. In this way, when the cover can 102a and the second circuit board are electrically connected, the cover can 102a and the second circuit board are grounded, so that EMI can be shielded.

According to an embodiment, the cover can 102a may be a yoke cover can capable of performing a yoke function. In addition, the cover can 102a may be formed of a sus material, a magnetic material, or a metal material, but is not limited thereto, and any material having electrical conductivity may be used.

According to another embodiment, although not shown, the lens driving device 100A may further include a z-cover. The cover may be wrapped by the cover can 102a and fixedly support the bobbin 110 . The driving magnet 130 may be mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed on the inside of the cover. In this case, the cover may be electrically connected to the second circuit board instead of the cover can 102a or together with the cover can 102a to shield EMI.

Also, according to an embodiment, the cover can 102a or the cover may be electrically connected to the second circuit board using the first circuit board 170 . To this end, referring to FIG. 3 , the plurality of terminals 171 of the first circuit board 170 may further include an EMI shielding terminal 171a. The EMI shielding terminal 171a serves to electrically connect the cover can 102a and the second circuit board.

9 is a cross-sectional view taken along the line I-I shown in FIG. 1 and viewed in the positive (+) x-axis direction, and FIG. 10 is an enlarged cross-sectional view of part 'A' shown in FIG. and FIG. 11 is a partial perspective view of the lower left part of the resultant cut along the line II-II' shown in FIG. 1 . Here, reference numeral 171a-4 denotes a body of the first circuit board 170 .

9 to 11 , the EMI shielding terminal 171a may include an upper terminal part 171a-1 and a lower terminal part 171a-2. The upper terminal part 171a - 1 may be electrically connected to the cover can 102a or the cover (not shown). For example, referring to FIG. 10 , the inner surface 102a-1 of the cover can 102a or the inner surface of the cover (not shown) are the outer surface of the upper terminal part 171a-1 and solder, conductive epoxy, or It may be electrically connected by welding or the like. For example, in order to facilitate a process such as soldering, referring to FIG. 10 , the distance (g) between the inner surface 102a-1 of the cover can 102a and the outer surface of the upper terminal part 171a-1 may be 0.15 mm or less, but the embodiment is not limited to a specific value of this distance g.

In this case, the lower terminal part 171a - 2 may be electrically connected to the second circuit board and the upper terminal part 171a - 1 . In this case, the lower terminal part 171a - 2 may be electrically connected to the second circuit board by solder, conductive epoxy, or welding.

In addition, according to an embodiment, the terminal 171a for EMI shielding may further include an intermediate terminal part 171a - 3 . The middle terminal part 171a-3 is disposed between the upper terminal part 171a-1 and the lower terminal part 171a-2, and serves to electrically connect the upper and lower terminal parts 171a-1 and 171a-2. As shown, the upper, middle, and lower terminal portions 171a-1, 171a-2, and 171a-3 may be integrally formed or may be formed separately.

For example, the EMI shielding terminal 171a may be gold-plated to be electrically connected to the second circuit board, but the embodiment is not limited to the material of the EMI shielding terminal 171a.

12 is a schematic perspective view of a lens driving device 100B according to another embodiment in which a lens L is mounted.

The appearance of the cover can 102b and the base 190b shown in FIG. 12 is different from the lens driving device 100A shown in FIG. 1 , and the lens driving device 100A shown in FIG. 1 is a displacement detecting unit 180 . On the other hand, the lens driving device 100B shown in FIG. 12 does not include the displacement sensor 180 . Except for these differences, the internal configuration of the lens driving apparatus 100B illustrated in FIG. 12 may be the same as that of the lens driving apparatus 100A illustrated in FIGS. 1 to 11 . The VCM terminal 109 shown in FIG. 12 may correspond to a terminal for supplying a current to the first coil 120 in the lens driving apparatus 100A shown in FIG. 1 .

Hereinafter, only parts of the lens driving device 100B shown in FIG. 12 different from the lens driving device 100A shown in FIGS. 1 to 11 will be described for convenience of description, but the embodiment is not limited thereto.

According to another embodiment, the cover can 102a and the second circuit board may be electrically connected to each other in different ways without using the EMI shielding terminal 171a of the first circuit board 170 . To this end, referring to FIG. 12 , the cover can 102b may include at least one can protrusion 108 , and the base 190b may include a protrusion groove 190b - 1 . The at least one can protrusion 108 may protrude in a first direction (ie, -z direction) parallel to the optical axis to be electrically connected to the second circuit board. In this case, as illustrated in FIG. 12 , a plurality of can protrusions 108 may be provided, one on each side, but the embodiment is not limited to the number of can protrusions 108 . Although not shown, the at least one can protrusion 108 and the second circuit board may be electrically connected to each other by solder, conductive epoxy, or welding.

The can protrusion 108 may be inserted, penetrated, disposed, or fitted into the protruding groove 190b-1 formed in the base 190b.

According to another embodiment, the cover can (102a, 102b) or the cover (not shown) is electrically connected to the second circuit board by the first circuit board 170 as shown in FIGS. 1 to 11, As shown in FIG. 12 , it may be electrically connected to the second circuit board by the can protrusion 108 .

13 is a plan perspective view showing the bobbin 110 shown in FIG. 2 according to an embodiment, and FIG. 14 is a bottom perspective view showing the bobbin 110 shown in FIG. 2 according to an embodiment.

4 and 5, 7 and 8, and 13 and 14, the upper elastic member 150 and the lower elastic member 160 are raised and / or lowered in the optical axis direction of the bobbin 110. It can be supported flexibly. The upper elastic member 150 and the lower elastic member 160 may be provided as a leaf spring, but the embodiment is not limited to the respective shapes of the upper and lower elastic members 150 and 160 .

The upper elastic member 150 includes an inner frame 151 coupled to the bobbin 110 , an outer frame 152 coupled to the housing member 140 , and a connector connecting the inner frame 151 and the outer frame 152 . (153) may be included.

In addition, the lower elastic member 160 connects the inner frame 161 coupled to the bobbin 110 and the outer frame 162 coupled to the housing member 140 , and the inner frame 161 and the outer frame 162 . It may include a connection part 163 to

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 ascending and/or descending operation in the first direction, which is the optical axis direction, through a change in the position of the connection parts 153 and 163 and micro-deformation.

According to an embodiment, as shown in FIG. 7 , the upper elastic member 150 includes a plurality of first through-holes 152a in the outer frame 152 , and a plurality of second through-holes in the inner frame 151 . (151a) may be included.

The first through hole 152a is coupled to the upper frame support protrusion 144 formed on the upper surface of the housing member 140 , and the second through hole 151a is the upper support protrusion 113 formed on the upper surface of the bobbin 110 . can be combined with The upper support protrusion 113 will be described in detail later. That is, the outer frame 152 is mounted, seated, contacted, fixed, temporarily fixed, supported, disposed, or coupled to the housing member 140 through the first through hole 152a, and the inner frame 151 has the second through hole. It may be mounted, seated, contacted, fixed, temporarily fixed, supported, disposed, or coupled to the bobbin 110 through (151a).

The connection part 153 of the upper elastic member 150 connects the inner frame 151 and the outer frame 152 so that the inner frame 151 is elastically deformable within a predetermined range with respect to the outer frame 152 in the first direction. can

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 first coil 120 of the bobbin 110 and the first circuit board 170 . It may include at least one or more.

Referring to FIG. 8 , the lower elastic member 160 includes a plurality of fastening portions 162a in the outer frame 162 , and a plurality of third through holes (or grooves) 161a in the inner frame 161 . may include

As described above, the fastening portion 162a may be mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed on the lower surface of the housing member 140, and the third through hole 161a is The lower support protrusion 114 formed on the lower surface of the bobbin 110 shown in FIG. 14 may be in contact, coupled, fixed, or temporarily fixed. That is, the outer frame 162 may be mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed on the housing member 140 through the fastening portion 162a, and the inner frame 161 is It may be mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed on the bobbin 110 through the third through hole 161a.

The connecting portion 163 of the lower elastic member 160 connects the inner frame 161 and the outer frame 162 so that the inner frame 161 is elastically deformable within a predetermined range with respect to the outer frame 162 in the first direction. can

The lower elastic member 160 may include a first lower elastic member 160a and a second lower elastic member 160b separated from each other. Through this two-part structure, the first lower elastic member 160a and the second lower elastic member 160b of the lower elastic member 160 may receive power of different polarities or different currents. That is, after the inner frame 161 and the outer frame 162 are coupled to the bobbin 110 and the housing member 140 , respectively, the inner frame corresponding to both ends of the first coil 120 disposed on the bobbin 110 . By providing a solder part at the position of the frame 161, a conductive connection such as soldering may be performed in the solder part to receive power of different polarities or different currents. In addition, the first lower elastic member 160a is electrically connected to one of both ends of the first coil 120 , and the other one of the both ends of the first coil 120 and the second lower elastic member 160b are connected to each other. It may be electrically connected to receive current and/or voltage from the outside. To this end, at least one of the inner frame 161 and the outer frame 162 of the lower elastic member 160 is electrically connected to at least one of the first coil 120 or the first circuit board 170 of the bobbin 110 . It may include at least one terminal unit connected to the Both ends of the first coil 120 may be disposed opposite to each other with respect to the bobbin 110 , or may be disposed adjacent to the same side.

Meanwhile, the upper elastic member 150 and the lower elastic member 160 , the bobbin 110 and the housing member 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 heat fusion.

As another embodiment, the upper elastic member 150 may be configured in a two-part structure as illustrated in FIG. 8 , and the lower elastic member 160 may be configured in an integrated structure as illustrated in FIG. 7 .

15 is an exploded perspective view of the bobbin 110, the first coil 120, the displacement sensing unit 180, and the sensing magnet 182 according to an embodiment, and FIG. 16 is the bobbin 110 according to the embodiment. ), the first coil 120 , the first and second driving magnets 131 and 132 , the displacement sensing unit 180 , and a schematic bottom perspective view of the sensing magnet 182 .

The bobbin 110 may be installed in the inner space of the housing member 140 to be reciprocally movable in the optical axis direction. The first coil 120 is installed on the outer circumferential surface of the bobbin 110 to electromagnetically interact with the driving magnet 130 of the housing member 140 to reciprocate the bobbin 110 in the first direction.

In addition, the bobbin 110 is elastically (or elastically) by the upper elastic member 150 and the lower elastic member 160 so that the bobbin 110 moves in the first direction, which is the optical axis direction, to perform the auto-focusing function. ) can be supported.

Although not shown in the bobbin 110, at least one lens may be mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed therein. For example, the bobbin 110 may include an installed lens barrel (not shown). The lens barrel is a component of a camera module to be described later and may not be an essential component of the lens driving device. 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 the 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 screwing, without forming a screw thread on the inner circumferential surface of the bobbin 110 .

Alternatively, 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 respectively protrude from the upper and lower surfaces of the bobbin 110 . The upper support protrusion 113 may be provided in a cylindrical or prismatic shape, as shown in FIG. 13 , and couple, fix, and temporarily fix the inner frame 151 and the bobbin 110 of the upper elastic member 150 . , contact, or support. According to an embodiment, the second through hole 151a may be formed at a position corresponding to the upper support protrusion 113 of the inner frame 151 of the upper elastic member 150 . In this case, the upper support protrusion 113 and the second through hole 151a 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 113 may be provided. In this case, the distance between each of the upper support protrusions 113 may be appropriately arranged within a range that can avoid interference with surrounding components. That is, each of the upper support protrusions 113 may be arranged at regular intervals symmetrically with respect to the center of the bobbin 110 , and their intervals are not constant, but on a specific virtual line passing through the center of the bobbin 110 . It may be formed to be symmetrical with respect to

As shown in FIG. 14 , the lower support protrusion 114 may be provided in a cylindrical or prismatic shape like the upper support protrusion 113 , and the inner frame 161 and the bobbin 110 of the lower elastic member 160 . may be coupled, fixed, temporarily fixed, contacted, or supported. According to an embodiment, a third through hole 161a may be formed at 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 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. 14 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 .

And, on the upper and lower surfaces of the bobbin 110 , the upper escape groove 112 and the lower side are located at positions corresponding to the connection part 153 of the upper elastic member 150 and the connection part 163 of the lower elastic member 160 . Evacuation grooves 118 may be formed, respectively.

Since the upper escape groove 112 and the lower escape groove 118 are provided, spatial interference between the connection parts 153 and 163 and the bobbin 110 when the bobbin 110 moves in the first direction with respect to the housing member 140 This can be removed to make it easier to elastically deform the connection parts 153 and 163 . In addition, the location of the upper escape groove 112 may be disposed at the corner of the housing member 140 as illustrated in FIG. 13 , but may also be disposed on the side according to the shape and/or position of the connection part of the elastic member.

In addition, on the outer peripheral surface of the bobbin 110, a seating groove 116 for a coil in which the first coil 120 is mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed may be provided, Examples are not limited thereto. That is, according to another embodiment, the first coil 120 is directly mounted on the outer peripheral surface of the bobbin 110, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or instead of being disposed, the bobbin 110 . A coil ring (not shown) having the same shape as the outer circumferential shape of the bobbin 110 is mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed adjacent to the outer circumferential surface of the bobbin 110, the first coil 120 ) may be mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed on the coil ring.

The first coil 120 is to be provided as a ring-shaped coil block mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed on the outer peripheral surface of the bobbin 110 or the seating groove 116 for the coil. However, the present invention is not limited thereto, and the first coil 120 may be directly wound on the outer circumferential surface of the bobbin 110 or the coil seating groove 116 . When the pre-wound first coil 120 is mounted, inserted, or disposed, it may be mounted, inserted, or disposed from the upper or lower portion of the bobbin 110 .

According to an embodiment, the first coil 120 may be formed in an approximately octagonal shape as shown in FIG. 15 . This is a shape corresponding to the shape of the outer peripheral surface of the bobbin 110, and the bobbin 110 may also have an octagonal shape. In addition, at least four surfaces of the first coil 120 may be provided in a straight line, and a corner portion connecting these surfaces may be implemented as a round or a straight line. In this case, the portion formed in a straight line may be a surface corresponding to the driving magnet 130 . Also, a surface of the driving magnet 130 corresponding to the first coil 120 may have the same curvature as that of the first coil 120 . That is, if the first coil 120 is a straight line, the corresponding driving magnet 130 may have a straight line, and if the first coil 120 is curved, the corresponding driving magnet 130 may have a curved surface. , and may also have the same curvature. Also, even if the first coil 120 is curved, the corresponding driving magnet 130 may have a straight surface, or vice versa.

The first coil 120 is for performing an autofocus function by moving the bobbin 110 in the optical axis direction. When a current is supplied, it can electromagnetically interact with the driving magnet 130 to form an electromagnetic force. As described above, the electromagnetic force may move the bobbin 110 .

On the other hand, the first coil 120 may be configured to correspond to the driving magnet 130 . As shown, the driving magnet 130 is configured as a single body and the entire surface facing the first coil 120 . When is provided to have the same polarity, the surface corresponding to the first coil 120 and the driving magnet 130 may also be configured to have 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 so that the surface facing the first coil 120 is divided into two or more, the first coil 120 It is also possible to be divided into a number corresponding to the divided driving magnet 130 .

Meanwhile, the lens driving apparatuses 100A and 100B may further include a sensing magnet 182 . The sensing magnet 182 may be mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported, or disposed on the bobbin 110 . For this reason, the sensing magnet 182 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 182 may be integrally configured with the bobbin 110 , and may be disposed such that an upper direction of the bobbin 110 is an N pole and a lower direction of the bobbin 110 is an S pole. However, the present invention is not limited thereto, and the reverse configuration is also possible.

In addition, the sensing magnet 182 may be divided into two in a plane perpendicular to the optical axis. 13 to 16 , the bobbin 110 may further include a receiving groove 117 for accommodating the sensing magnet 182 on the outer peripheral surface of the bobbin 110 .

The receiving 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 may be formed on one side of the bobbin 110 so that at least a portion of the receiving groove 117 is located inside the first coil 120 .

In addition, at least a portion 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 182 can be accommodated in the bobbin 110, and thereby a separate sensing magnet 182 for the sensing magnet 182 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 may be disposed at a position corresponding to the position of the displacement sensing unit 180 of the housing member 140 (or a position facing the position sensing sensor 180 ). For this reason, the displacement detecting unit 180 and the sensing magnet 182 may be aligned on the same axis.

The distance d between the sensing magnet 182 and the displacement detection unit 180 can be minimized as the thickness of the first coil 120 and the separation distance between the first coil 120 and the displacement detection unit 180 . Therefore, the magnetic force detection accuracy of the displacement sensor 180 can be improved.

More specifically, as illustrated in FIGS. 13 to 16 , the receiving groove 117 has an inner surface on which one surface of the sensing magnet 182 is supported, and a predetermined depth more inside than the inner surface so that an adhesive can be injected. It may include an adhesive groove 117b concave with the .

The inner surface is one surface positioned in the inner direction toward the center of the bobbin 110, and when the sensing magnet 182 has a rectangular parallelepiped shape, the wide surface of the sensing magnet 182 is in contact or is seated.

The bonding groove 117b may be a groove formed so that a portion of the inner surface thereof is more deeply concave in the inner direction toward the center of the bobbin 110 . The adhesive groove 117b may be formed up to the inner surface of the bobbin 110 on which one surface of the sensing magnet 182 is mounted, inserted, seated, contacted, coupled, fixed, temporarily fixed, supported or disposed.

As another embodiment, the receiving groove 117 has an outer peripheral surface (ie, a coil seating groove 116 ) on which the second coil 120 is provided from an inner surface on which one surface (ie, a wide surface) of the sensing magnet 182 is supported. ) surface) may be less than or equal to the thickness of the sensing magnet 182 . For this reason, the sensing magnet 182 may be fixed in the receiving groove 117 by the inner pressing force of the first coil 120 due to the winding of the first coil 120 . In this case, it may not be necessary to use an adhesive.

As an additional embodiment, although not shown in the drawings, the bobbin 110 is positioned symmetrically with the receiving groove 117 with respect to 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 further include an additional accommodating groove 117 formed on the outer circumferential surface of 110 , and a weight balancing member accommodated in the additional accommodating groove 117 .

According to an embodiment, the sensing magnet 182 may be omitted. In this case, the driving magnet 130 may be used instead of the sensing magnet 182 .

As described above, by using the result detected by the displacement detecting unit 180, the embodiment feeds back the amount of displacement in the optical axis direction of the lens to readjust the position of the lens in the optical axis direction, thereby shortening the focus alignment time of the lens. can

In addition, the embodiment can minimize the gap between the sensing magnet 182 provided on the bobbin 110, which is a moving body, and the displacement sensor 180, which is provided on the housing member 140, which is a fixed body, thereby reducing the lens Since the amount of displacement in the optical axis direction can be detected more accurately, the lens can be more accurately positioned at the focal length of the lens.

In addition, in the embodiment, the sensing magnet 182 is mounted, seated, contacted, fixed, temporarily fixed, coupled, supported, or disposed in the bobbin 110 , and the displacement detecting unit 180 is installed inside the housing member 140 . By mounting, seating, contacting, fixing, temporarily fixing, combining, supporting, or disposing on the camera module, space efficiency of the camera module (particularly, bobbin) is improved because a separate space for mounting the displacement sensing unit 180 is not required. can do it

On the other hand, the lens driving apparatus 100A, 100B according to the above-described embodiment may be used in various fields, for example, a camera module. For example, the camera module may be applied to a mobile device such as a mobile phone.

The camera module of the embodiment includes a lens mounted, inserted, seated, contacted, coupled, fixed, supported or disposed in the above-described lens driving device 100A, 100B, and the lens driving device 100A, 100B, and an image sensor on the lower side (not shown), a second circuit board (not shown) (or a main circuit board) on which the image sensor is disposed, and an optical system. In this case, the camera module according to the embodiment may further include a lens barrel coupled to the bobbin 110 .

The lens barrel may be the same as described above, and the second circuit board may form a bottom surface of the camera module from a portion on which the image sensor is mounted. In addition, the optical system may include at least one or more lenses that transmit an image to the image sensor.

In addition, the camera module may further include a camera module controller (not shown). In this case, the first displacement value calculated based on the current change value detected by the displacement sensor 180 may be compared with the focal length of the lens according to the distance between the subject and the lens. Thereafter, the camera module control unit readjusts the amount of current applied to the first 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 . It can be moved by the second displacement amount in the first direction. In addition, according to the first direction movement of the displacement sensing unit 180 fixedly coupled to the fixed housing member 140, the sensing magnet 182 fixedly coupled to the moving bobbin 110, in the sensing magnet 182 By detecting the change in the emitted magnetic force, the current position or the first displacement amount of the bobbin 110 can be calculated or determined in a separate driver IC or camera module control unit based on the current change amount output based on the detected magnetic force change amount There is. The current position or the first displacement amount of the bobbin 110 calculated or determined by the displacement detection unit in this way is transmitted to the control unit of the first circuit board 170, and the control unit recrystallizes the position of the bobbin 110 for auto-focusing. The amount of current applied to the first coil 120 can be adjusted.

Meanwhile, an actuator module capable of performing an auto-focusing function and an image stabilization function may be installed in the optical system. The actuator module performing the auto-focusing function may be configured in various ways, and a voice coil unit motor is generally used. The lens driving apparatuses 100A and 100B according to the above-described embodiment may correspond to an actuator module that performs an auto-focusing function. However, the embodiment is not limited to the actuator module performing the auto-focusing function, and may also be applied to the actuator module performing both the auto-focusing function and the hand-shake correction function.

Although not shown, a second coil (not shown), a support member (not shown), and a plurality of sensing units (not shown) may be added to the lens driving devices 100A and 100B that perform the above-described auto-focusing function. In this case, the lens driving apparatuses 100A and 100B may perform an auto-focusing function as well as a hand-shake correction function. Here, the second coil is disposed so that the bottom surface of the driving magnet 130 directly faces the second coil, and each of the plurality of sensing units may be implemented as, for example, a Hall sensor, and each of the plurality of sensing units and the second coil The two coils and the driving magnet may be disposed on the same axis. Accordingly, the second coil may perform handshake correction by moving the housing member 140 in the second and/or third directions through interaction with the driving magnet 130 .

In this case, a support member may be disposed on the upper surfaces of the bases 190a and 190b to elastically (or elastically) support the horizontal operation of the housing member 140 moving in a direction perpendicular to the first direction.

In addition, the camera module may further include an infrared cut filter (not shown). The infrared cut filter serves to block light in the infrared region from being incident on the image sensor. In this case, in the bases 190a and 190b illustrated in FIG. 2 or FIG. 12 , an infrared cut filter may be installed at a position corresponding to the image sensor, and may be coupled to a holder member (not shown). In addition, the bases 190a and 190b may support the lower side of the holder member.

A separate terminal member may be installed in the bases 190a and 190b to conduct electricity with the second circuit board, and the terminals may be integrally formed using a surface electrode or the like. Meanwhile, the bases 190a and 190b may function as a sensor holder to protect the image sensor, and in this case, protrusions may be formed in a downward direction along the side surfaces of the bases 190a and 190b. However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed under the bases 190a and 190b to perform its role.

In the above, the embodiment has been mainly described, but this is only an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are not exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

100A, 100B: lens drive unit 102a, 102b: cover can
104: first groove 106: third groove
108: can protrusion 110: bobbin
112: upper escape groove 118: lower escape groove
113: upper support protrusion 114: lower support protrusion
116: seating groove for coil 117: receiving groove
117b: adhesive groove 120: first coil
130, 131, 132: magnet for driving 140: housing member
141: side of housing member 141a, 141a': through hole for magnet
141b: through hole for sensor 143: first stopper
144: upper frame supporting projection 147: lower frame supporting projection
148: lower guide groove
149: mounting projection 150: upper elastic member
151, 161: inner frame 151a: second through hole
152, 162: outer frame 153, 163: connection part
152a: first through hole 155: guide groove
160, 160a, 160b: lower elastic member 161a: third through hole
162a: fastening unit 170: first circuit board
171: Terminal 171a of the first circuit board: EMI shielding terminal
171a-1: upper terminal portion 171a-2: lower terminal portion
171a-3: middle terminal portion 171b, 171c: power terminal
171d, 171e: I ² C communication terminal 172: Various pins
173: mounting through hole 180: displacement sensing unit
182: sensing magnet 190a, 190b: base
190b-1: protruding groove 192: second groove
194: no guide

Claims (21)

housing member;
a bobbin disposed inside the housing member;
a coil disposed on the outer surface of the bobbin;
a driving magnet disposed on the housing member to face the coil and including a first driving magnet and a second driving magnet facing the first driving magnet;
a cover can comprising an upper surface, four side surfaces extending from the upper surface, and a groove formed in a first side surface of the four side surfaces;
a base fixed to the cover can;
a first circuit board disposed on a side surface of the base corresponding to the groove portion of the cover can to supply a current to the coil;
a displacement sensing unit configured to sense the displacement of the bobbin in the optical axis and coupled to the first circuit board; and
and a sensing magnet disposed at a position corresponding to the displacement sensing unit and coupled to the bobbin,
The first circuit board includes a plurality of terminals including a ground terminal connected to the ground,
The ground terminal electrically connects the cover can to the ground,
the ground terminal is disposed on a terminal surface of the first circuit board opposite to the first side surface of the cover can;
the first circuit board is disposed on a side surface of the housing member;
In a horizontal direction perpendicular to the side surface of the housing member, the first circuit board is positioned between the cover can and the side surface of the housing member;
The cover can is electrically connected to the second circuit board on which the image sensor is mounted by the ground terminal,
The ground terminal of the first circuit board is
an upper terminal part electrically connected to the cover can; and
and a lower terminal part electrically connected to the second circuit board and the upper terminal part
lens drive. delete According to claim 1,
A height of a side surface of the base corresponding to the groove portion of the cover can is greater than a height of the other side surface of the base. delete The method according to claim 1, wherein the upper terminal part is connected to the cover can by soldering, conductive epoxy, or welding;
The lower terminal part is connected to the second circuit board by soldering, conductive epoxy, or welding. The lens driving device according to claim 1, wherein the driving magnet is fixed to the housing member by an adhesive. The lens driving apparatus of claim 1 , wherein the first circuit board disposed on the side surface of the base is further exposed to the outside through the groove portion of the cover can. delete delete delete According to claim 1,
The bobbin includes a receiving groove formed inside,
The sensing magnet is a lens driving device accommodated in the receiving groove. The lens driving device according to claim 11, wherein the bobbin further includes an additional groove facing the receiving groove. The method of claim 1 , wherein the first circuit board comprises:
a communication terminal for receiving a signal; and
A lens driving device further comprising a power terminal receiving power. The lens driving device according to claim 12, further comprising a weight balancing member disposed in the additional groove. housing member;
lens;
a bobbin on which the lens is mounted and disposed inside the housing member;
a coil disposed on the outer surface of the bobbin;
a driving magnet disposed on the housing member to face the coil and including a first driving magnet and a second driving magnet facing the first driving magnet;
a cover can comprising an upper surface, four side surfaces extending from the upper surface, and a groove formed in a first side surface of the four side surfaces;
a base coupled to the cover can;
a first circuit board disposed on a side surface of the base corresponding to the groove portion of the cover can and supplying current to the coil;
and a displacement sensing unit electrically coupled to the first circuit board to detect the displacement of the bobbin in the optical axis of the lens by detecting the degree of variation of the driving magnet,
The first circuit board includes a plurality of terminals including a ground terminal,
The ground terminal electrically connects the cover can to the ground,
the ground terminal is disposed on a terminal surface opposite to the first side surface of the cover can;
the first circuit board is disposed on a side surface of the housing member;
In a horizontal direction perpendicular to the side surface of the housing member, the first circuit board is positioned between the cover can and the side surface of the housing member;
The cover can is electrically connected to the second circuit board on which the image sensor is mounted by the ground terminal,
The ground terminal of the first circuit board is
an upper terminal part electrically connected to the cover can; and
and a lower terminal part electrically connected to the second circuit board and the upper terminal part
lens drive. 16. The method of claim 15,
The lens driving device further comprising a sensing magnet disposed at a position corresponding to the displacement sensing unit and coupled to the bobbin. delete 16. The method of claim 15,
A height of a side surface of the base disposed on the first circuit board is greater than a height of the other side surface of the base. The lens driving device according to claim 15, wherein the upper terminal part is soldered, conductive epoxy, or welded to the cover can, and the lower terminal part is soldered, conductive epoxy, or welded to the ground. delete delete

Images