Lens driving motor

Abstract

To provide an OIS type lens driving motor with improved reliability in consideration of miniaturization and simplification.SOLUTION: A lens driving motor comprises: a mover that includes a bobbin for fixing a lens, and magnets disposed on the bobbin; a stator that includes a first coil and a second coil arranged so as to correspond to the respective magnets, a housing having an upper side surface with an open center and a support with an outside surface on which the first coil is disposed, a base supporting the housing and having a through hole formed in its center so as to correspond to the lens, and a substrate disposed on the upper side surface of the base and applying power to the second coil; and a hall sensor disposed at a position facing the magnets so as to sense a phase of the mover.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] An embodiment of the present invention relates to a lens drive motor with an improved structure. [Background technology]

[0002] As various mobile terminals have become widespread and wireless Internet services have become commercially available, As the number of mobile terminals increases, consumer needs regarding mobile terminals are also diversifying. Therefore, various kinds of add-on devices are installed in the portable terminals.

[0003] Among them, you can take photos or videos of the subject, save the image data, and then use it as needed. A typical example that can edit and transfer the image according to the needs is the camera module.

[0004] In recent years, notebook computers, camera phones, PDAs, smart phones, toys, etc. In any wide variety of multimedia fields, including surveillance cameras and video tape recorders, There is an increasing demand for small camera modules for use in image input devices such as information terminals.

[0005] The camera module includes a lens drive motor, and such lens drive motor is It can also focus and correct camera shake, and the existing lens drive motor Additional information for configuring OIS (Optical Image Stabilization) The internal structure of the lens drive motor is relatively complex due to the inclusion of additional components. The assembly line for such a lens drive motor becomes complicated.

[0006] In addition, such structural complexity limits the miniaturization of the lens drive motor and reduces product reliability. and may cause limitations in reducing product costs. Summary of the Invention [Problem to be solved by the invention]

[0007] The embodiment is an OIS type lens driver that is compact, simple, and has improved reliability. The present invention aims to provide a motor. [Means for solving the problem]

[0008] A lens drive motor according to an embodiment of the present invention includes a movable element including a magnet portion; a stator including a first coil portion and a second coil portion arranged to face the coil portion; The stator includes a housing that movably accommodates the movable element therein, and the housing a base for supporting the first coil portion and the second coil portion, the first coil portion and the second coil portion being disposed on one side of the base; and a substrate that supplies power to the coil portion.

[0009] The first coil portion is located in the housing, and the second coil portion is located in the substrate. Can be located.

[0010] A hoist is disposed at a position facing the magnet portion and serves to sense the phase of the mover. The sensor unit may further include a sensor portion.

[0011] The second coil portion is disposed on the upper side of the substrate, and the Hall sensor portion is disposed on the lower side of the substrate. The base is disposed on a surface, and the base includes a hall sensor receiving groove in which the hall sensor portion is received. It is possible to do so.

[0012] The Hall sensor unit includes two Hall sensors arranged on two adjacent sides of the substrate. The sensor may include a sensor.

[0013] The substrate is a flexible printed circuit board (FPCB). rd), and the substrate is formed by bending at least one side and receiving power supply from an external device. The base includes a terminal portion for receiving the terminal, and the base has a terminating portion on one side of which the terminal portion is seated. It may include a terminal groove.

[0014] The substrate has a first terminal portion electrically connected to the first coil portion and a second terminal portion electrically connected to the second coil portion. and a second terminal portion electrically connected to the coil portion.

[0015] The second coil section is made up of four FPs (Fine Pattern) that are individually powered. n) a coil.

[0016] The movable member further includes a bobbin having the magnet portion and accommodating a lens portion therein. an upper spring that connects an upper surface of the housing and an upper surface of the bobbin; and a lower spring connecting a lower surface of the spring and a lower surface of the bobbin. do.

[0017] The upper and lower springs have an outer portion coupled to the housing and a bobbin. and a connecting portion connecting the outer portion and the inner portion. do.

[0018] The upper surface of the housing is recessed in an area where the connecting portion overlaps. A step portion may be provided.

[0019] The bobbin has a protruding fixing piece on an upper side thereof, and the inner portion is It may include a folding portion that is folded so as to surround the outer surface and both side surfaces of the fixed piece.

[0020] Each of the upper and lower springs may be an integrally formed leaf spring. do.

[0021] The movable member further includes a bobbin having the magnet portion and accommodating a lens portion therein. The bobbin includes a rotation prevention portion protruding from an outer circumferential surface thereof, and the housing includes the The anti-rotation portion may be located apart from an outer peripheral surface of the bobbin.

[0022] A lens drive motor according to another embodiment of the present invention includes a bobbin for fixing a lens unit; a magnet portion disposed on a bobbin; and a mover including the magnet portion; A first coil portion and a second coil portion are arranged, and a top surface having an opening in the center and the A housing including a support portion on an outer surface of which the first coil portion is disposed, and a support portion supporting the housing. a base having a through hole formed in the center thereof corresponding to the lens portion; A fixed coil including a substrate disposed on a side and applying power to the first coil portion and the second coil portion. It may contain a constant;

[0023] A hoist is disposed at a position facing the magnet portion and serves to sense the phase of the mover. The sensor unit may further include a sensor portion.

[0024] The magnet portion includes four magnets arranged at equal intervals on the outer surface of the bobbin. The bobbin has magnet grooves formed on its outer circumferential surface, into which the magnets are attached. It can be done. Effect of the Invention

[0025] According to the embodiment of the present invention, the housing is fixed and only the bobbin is driven in all directions. Therefore, the internal structure of the lens drive motor or the camera motor is simplified, miniaturized, and highly reliable. It is possible to embody the Joule. [Brief description of the drawings]

[0026] [Figure 1] FIG. 2 is an exploded perspective view of the lens drive motor according to the embodiment of the present invention. [Diagram 2] FIG. 2 is a view showing a lens drive motor according to an embodiment of the present invention with a cover can removed. [Diagram 3] 1 is a side cross-sectional view of a lens drive motor according to an embodiment of the present invention. [Figure 4] 1 is a top view showing a state in which a housing and a bobbin of a lens drive motor according to an embodiment of the present invention are joined together; [Diagram 5] 4 is a perspective view showing a coupled state between a base and a second coil portion of the lens drive motor according to the embodiment of the present invention. FIG. [Figure 6] 6 is a perspective view showing a state in which the substrate and the second coil portion in FIG. 5 are coupled together. FIG. [Figure 7] 2A to 2C are diagrams illustrating a magnet portion, a Hall sensor portion, a substrate, and a base according to an embodiment of the present invention. [Figure 8] FIG. 4 is a top side view of the elastic unit according to the embodiment of the present invention. [Figure 9] 5 is a graph showing a schematic diagram of a displacement according to a change in a current applied to a first coil unit of the lens drive motor according to the embodiment of the present invention. [Figure 10] 5A and 5B are diagrams illustrating a movement path of a lens drive motor according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] Unless otherwise defined, all terms in this specification are defined according to their general meaning as understood by those of ordinary skill in the art. If a term is used in this specification, it is assumed that the term has the same general meaning as that term. In case of conflict with taste, the definitions used herein shall govern.

[0029] However, the invention described below is only intended to illustrate the embodiments of the present invention. The above definitions are not intended to limit the scope of the present invention, and are the same throughout the specification. The reference numbers used indicate identical components.

[0030] The lens drive motor according to the embodiment will be described in detail below with reference to the drawings. That is correct.

[0031] FIG. 1 is an exploded perspective view of a lens drive motor according to an embodiment of the present invention, and FIG. FIG. 3 is a view of the lens drive motor according to the embodiment with the cover can removed. FIG. 4 is a side cross-sectional view of the lens drive motor according to the embodiment of the present invention. FIG. 5 is a top view showing a state in which a housing and a bobbin are joined together, and FIG. 11 is a perspective view showing a state in which a first terminal portion 341a and a second coil portion of the lens driving motor are connected to each other. 6 is a perspective view showing a state where the substrate and the second coil portion of FIG. 5 are joined together, and FIG. FIG. 8 shows the magnet unit, the Hall sensor unit, the substrate, and the base according to the embodiment. FIG. 9 is a top side view of an elastic unit according to an embodiment of the invention; FIG. 5 is a graph showing a displacement according to a change in current applied to a first coil of a driving motor; FIG. 10 is a diagram showing a movement path of a lens drive motor according to an embodiment of the present invention.

[0032] Referring to FIG. 1, the lens drive motor according to the embodiment is roughly comprised of a mover 200 and a fixed element. The embodiment further includes a cover can 100 and an elastic unit 400. and further includes a Hall sensor unit 500. In the embodiment, the z-axis is the optical axis direction. The x-axis is perpendicular to the z-axis, and the y-axis is perpendicular to the z-axis and x-axis. do.

[0033] 1 and 3, the cover can 100 includes a movable element 200 and a stator 202, which will be described later. 300, and an opening is formed on the upper surface through which a lens portion (not shown) described later is exposed. The lower surface is open and closed by a base 350, which will be described later. It is possible to create the appearance of a rotating motor.

[0034] As shown in the figure, the cover can 100 has an opening on the upper side and an open lower side. The cover can 100 may be formed in a rectangular parallelepiped shape. In short, the shape of the cover can 100 can be a square shape when viewed from above. The shape may be an octagonal shape, but is not limited thereto.

[0035] The cover can 100 has an inner surface that is in close contact with the side surface and / or the top surface of a base 350, which will be described later. The base 350 is attached to the bottom surface of the device, and the bottom surface is entirely or partially closed by the base 350, and the device is protected from external impacts. It protects the components inside the housing while also preventing the penetration of external contaminants.

[0036] Although not shown, the cover can 100 may further include a fastening piece (not shown). This can be formed on the lower end of at least one surface. The fastening groove (not shown) into which the fastening piece is inserted is formed on the side of the lens driving mode. Therefore, the sealing and fastening functions of the connector can be more firmly realized.

[0037] In addition, the cover can 100 protects the lens drive from external radio wave interference generated by mobile phones, etc. The cover can 1 also functions to protect the components of the motor. 00 may be made of metal, but may also be made of injection molding or insert molding using metal materials. It can be made of a variety of materials.

[0038] The mover 200 includes a bobbin 210 and a magnet portion 220 .

[0039] 1 to 4, the bobbin 210 has an outer peripheral surface 210a on which the respective ma A magnet groove 211 in which a magnet is mounted is formed. It can be formed to correspond to the shape of the magnet, or the magnet can be attached. In some cases, a seating area may be formed.

[0040] Although not shown, the upper and / or lower surfaces of the bobbin 210 are provided with a The upper spring 410 and / or the base 350 are arranged so that the bobbin 210 can be supported on the upper side of the base 350. Alternatively, fastening protrusions (not shown) are formed to fasten with the inner portions 412a and 422a of the lower spring 420. The shape of the fastening projections may be circular, angular, or a combination thereof.

[0041] Referring to FIG. 4, the bobbin 210 has at least one or more On the other hand, the rotation prevention portion 213 is formed by protruding four In the embodiment, the AF drive and / or the OIS drive can be formed by one bobbin. Since the bobbin 210 is embodied with only 10 movements, a rotation prevention portion 213 can be formed on the bobbin 210. This is what we should do.

[0042] In other words, when the bobbin 210 moves along the x-axis and y-axis, the outer circumferential surface 210 a and the rotation prevention portion 213, together with the inner peripheral surface of the housing 310, serve to absorb the shock of the bobbin 210. At the same time, the rotation angle of the bobbin 210 can be limited. For example, the impact on the x and y axes is The rotation prevention portion 213 and the inner surface of the housing 310 come into contact with each other to reduce the amount of rotation with respect to the x and y axes. The impact in the angular direction is generated when the outer peripheral surface 210a of the bobbin 210 and the inner surface of the housing 310 come into contact with each other. The shock to the rotation is absorbed by the opening of the rotation prevention portion 213 on the outer circumferential surface 210a of the bobbin 210. The starting portion and the inner surface of the housing 310 can come into contact and be relaxed.

[0043] Also, referring to FIG. 4, the shock protection for the x-axis and / or y-axis is provided by the bobbin and the housing. The straight part D of the bobbin can be used, and the effect on the diagonal part is The rounded part R of the ring can be used to prevent impact with the rotating part. To prevent impact, a stopper S located between the straight section and the round section can be used.

[0044] In addition, at least two fixing pieces are formed on the upper or lower surface of the bobbin 210. The fixing pieces 212 are formed, and the upper spring 410 or the lower spring 412 described later is attached to these fixing pieces 212. The folded portions 412aa, 422aa of the inner portions 412a, 422a of the 20th embodiment are arranged. These fixing pieces 212 may also be formed on the lower surface of the bobbin 210. The bent portions 412aa and 422aa are connected to the bobbin 210 and the upper spring 410 or the lower The assembly of the spring 420 can be easily guided and a firm fixation can be realized. do.

[0045] 1 and 3, the magnet portion 220 is disposed on the bobbin 210. The bobbin 210 includes four magnets arranged at equal intervals on its outer surface. The magnets are attached to the outer surface of the bobbin 210 by adhesive or are attached to the bobbin 210 by a wire. The magnet 210 can be inserted into the magnet groove 211 and fixed therein. In the latter case, the adhesive is applied to the magnet It can also be applied to the net groove 211 or the bottom and / or sides of the magnet to fix it in place. Cut.

[0046] As shown in the figure, the magnet portion 220 is attached to the outer surface of the bobbin 210. However, the coils are mounted at equal intervals at the four corners of the bobbin 210 to reduce the internal volume. It is possible to achieve efficient use.

[0047] The shape of the magnet may be a prismatic shape such as a triangular prism, a quadrangular prism, or a trapezoidal prism. The magnet may have a curved shape. It can also be machined to have a curved surface.

[0048] In one embodiment, each of the magnets has a north pole and a south pole magnetized in a horizontal direction. The structural shape of such a magnet and the first coil described later may be used. The first coil portion 320 and the second coil portion 330 interact according to Fleming's left hand rule, The bobbin 210 can be moved. Specifically, the magnet The first coil portion 320 is magnetized to a south pole and the second coil portion 310 is magnetized to a north pole. In this case, the first coil unit 320 is turned on in the direction of the arrow A. The bobbin 210 fixed to the magnet is moved in the z-axis direction, and the second coil portion 3 30, when power is applied, moves the bobbin 210 fixed to the magnet along the x-axis and / or or the y-axis.

[0049] The stator 300 includes a first coil portion 320, a second coil portion 330, and a housing 31. 0, and base 350.

[0050] Referring to FIG. 1 to FIG. 3, the first coil unit 320 and the second coil unit 330 are They are disposed so as to correspond to the magnet portions 220, respectively.

[0051] Specifically, the first coil unit 320 faces the outer surface of the magnet unit 220. The coils are arranged so that they are wound directly on the housing 310 (described later) or pre-wound on the housing 310. Such a first coil unit 320 is arranged in an AF (Automatic Focusing) mode. The coil may be a focusing coil, and is supplied with power from a substrate 340, which will be described later. , the bobbin 210 is rotated by the interaction with the magnet portion 220 disposed on the bobbin 210. can be moved in the direction of the optical axis.

[0052] The first coil portion 320 is disposed on the outer surface of a support portion 312 of a housing 310, which will be described later. and fixed by a guide rib 312b formed on the lower end of the support portion 312. The first coil portion 320 is wound around the support portion 312 and is a pre-wound second coil. One coil portion 320 may be attached to the support portion 312 .

[0053] Alternatively, four individual first coils may be arranged at 90° intervals on the outer surface of the housing 310. The first coil portion 320 may be arranged such that one end and the other end of the wound coil are It is electrically connected to a first terminal portion 344 on a substrate 340 described later, and power is applied to it. Methods using conductive materials, including adhesives such as epoxies and soldering, are It may be used for electrical connection between the first coil portion 320 and the first terminal portion 344 .

[0054] 1 and 4 to 6, the second coil unit 330 is The lower surface of the portion 220 can be disposed on a substrate 340, which will be described later. The second coil section 330 is arranged on a substrate. The second coil section may be a magneto-stabilization coil. 330 may be provided on each side of the substrate 340, in which case the power supply is individually connected. The second coil section 330 may have four second coils to which a voltage is applied. The second coil can be formed with a P (Fine Pattern) coil. The one end and the other end are electrically connected to a second terminal portion 343 formed on a substrate 340, which will be described later. and power can be applied to the Methods using conductive materials, including adhesives, may be used to make the electrical connections.

[0055] 1 to 4, the housing 310 has an upper surface 311 with an opening in the center. , and the first coil portion 320 is disposed on the outer surface. and a support portion 312 on which the support is placed.

[0056] Specifically, the upper spring 410 is fastened to the upper surface 311 of the housing 310. and / or a fusion protrusion 311b to which the upper spring 410 is fixed. These coupling protrusions 311a are formed on the outside when the upper spring 410, which will be described later, is disposed. The position of the connecting protrusion 311a can be easily guided. A space can be secured in which the bobbin can move in the optical axis direction. However, it is possible to secure a space for the movable member to move in a direction away from the base, which will be described later. The upper surface of the coupling protrusion 311 a can contact the inner surface of the cover can 100 .

[0057] The fusion protrusion 311b is engaged with a fusion groove or a fusion hole of the upper spring 410, which will be described later. Then, heat is applied to fuse the upper spring 410, so that the upper spring 410 can be firmly arranged. The coupling protrusions 311a and / or fusion protrusions 311b are shown together on the upper surface 311. However, only one of them may be formed on the upper surface 311 of the housing 310. In this case, Space that fixes the upper spring and the housing while allowing the upper spring to move upwards In addition, the lower surface of the housing 310 is also formed with the lower surface of the housing 310, which will be described later. It can also be fastened in the same manner as the side spring 420.

[0058] The housing 310 has an upper surface 311 to which the outer portions 411a and 421a are connected. In this way, a step portion 311c is formed on the upper surface 311, which is recessed in the optical axis direction. When the bobbin 210 moves in the −Z direction, which is the downward direction from the optical axis, the step portion 311c The inner parts 412a, 422a and the connecting parts 413a, 422b of the upper spring 410 move together. In other words, the lower direction is the direction in which the bobbin is It may be in a direction approaching the base. Also, the base 340 may be in a direction similar to this. The recessed portion 353 will be described later.

[0059] The inner surface of the housing 310 is shaped to correspond to the outer surface of the bobbin 210. The inner surface of the housing is formed to be spaced apart from the outer surface of the bobbin by a predetermined distance. That is, the inner surface of the first coil portion 320 fixed to the housing 310 is , and is spaced apart from the outer surface of the magnet part fixed to the bobbin by a certain distance. The inner surface of the housing 310 is in contact with the outer circumferential surface 210a of the bobbin 210 and the anti-rotation portion 213. The bobbin 21 is formed to correspond to the shape of the bobbin 21, including the direction of rotation. It has the advantage of providing shock protection in all directions.

[0060] The support parts 312 of the housing 310 are provided at the lower corners of the upper surface 311. The support portion is formed by injection molding or the like, and can be integrally formed. 312 is a corresponding surface 312a that is spaced a certain distance from a fixing protrusion 351 of a base 350 described later. In this case, the first coil portion 320 is disposed on the support portion and has an octagonal shape. The portion having the shape or disposed on the corresponding surface has a curved shape, and the side surface of the housing Additionally, the portions disposed on both supports may have a shape having a straight line shape.

[0061] In addition, the first coil portion 320 is disposed at the lower end of the support portion 312 of the housing 310. A guide rib 312b is formed to support the first coil and to firmly support the winding or mounting of the first coil. It can be fixed.

[0062] Since the housing 310 is fixed even when the OIS is in operation, the cover can 100 as a single part. Since no separation space is required between the housing 310, the volume of the product can be significantly reduced. can.

[0063] 1, 5 and 6, the substrate 340 is disposed on the upper side of a base 350, which will be described later. The first coil unit 330 is disposed on the first surface of the substrate 310 so that power can be applied to the second coil unit 330. Power can also be applied to coil portion 320.

[0064] Specifically, the upper surface of the substrate 340 is a first terminal for applying power from the outside. The terminal portion 341a and / or the second terminal portion 341b are bent downward. The second coil unit 330 and the second coil unit 340 are connected to each other by applying power from another power supply board 340 or from the outside. The power may be applied to the first coil unit 320 and / or the second coil unit 320. The Hall sensor unit 500 is mounted on the surface, and the first terminal unit 341a and / or Or, it is electrically connected to the second terminal portion 341b.

[0065] The first terminal portion 341a and the second terminal portion 341b are connected to a Hall sensor. The two Hall sensors of the sub-unit 500 are formed on the sides of the substrate other than the side on which the Hall sensors are to be disposed. This is desirable in terms of efficient space saving, but is not limited to this.

[0066] The substrate 340 has an FPCB ( This will be realized on a Flexible Printed Circuit Board (FPCB). can.

[0067] In addition, the substrate 340 is made of a small material so that it can be easily fixed to the base 350 described later. At least one fastening hole 342 or fastening groove is formed, and the base 350 described later is , the fastening hole 342 or the fastening groove is formed with a fastening protrusion 352 corresponding thereto. The shape of the bolt, or the fastening groove and fastening protrusion may be circular or rectangular. , may have a rectangular shape, and the number may be at least two or more, and the positions may be It can be placed in a corner.

[0068] In addition, the substrate 340 is a substrate in which each coil of the second coil unit 330 is electrically The second terminal portion 343 that can be electrically connected to the coil of the first coil portion 320 is electrically connected to the second terminal portion 343. The first terminal portion 344 is formed on the upper surface of the substrate 300. The first terminal portion 344 may be formed on the upper surface of the substrate 340. The second terminal portion 343 is provided with a plurality of terminals 341 and 342 so as to be electrically connected to the respective second coils. In other words, the coil has one end and the other end, and the above-mentioned solders The ring part can form a pair of two soldering points. Also, inside the board When two of the four second coils are electrically connected, The pins are paired so that two soldering points can be paired.

[0069] 1 to 3 and 5, the base 350 supports the mover 200. The base 3 is spaced apart from the bottom surface of the bobbin 210 at a predetermined distance. 50 supports the housing 310 and is spaced at a predetermined distance from the lower surface of the bobbin 210 at the center. A recessed portion 353 is formed so that the recessed portion 353 can be positioned apart from the other portions. In the center of the recess 3, a through hole corresponding to the lens portion is formed. 353 can secure a space for the bobbin to move downward, or can be designed In accordance with the above, if there is a space in which the bobbin can move downward even without the recess, The recessed portion may not be a required component.

[0070] In addition, one side of the base 350 is a first terminal portion 341a on which the first terminal portion 341a is seated. The first terminal groove 354 and the second terminal groove 354 in which the second terminal portion 341b is seated. Null grooves (not shown) are formed in the terminal grooves, and these terminal grooves are The first terminal groove 354 and / or the second terminal groove 355 may be formed according to the number of the terminals. Alternatively, the second terminal groove is formed so that the terminal portion 341 of the substrate does not protrude outward. If there are two terminal portions 341, the depth of the terminal groove 354 may be the same as that of the terminal portion 341. Terminal grooves 354 are formed on two sides of the base. In this case, two terminal grooves 35 4 are formed on opposite sides of each other.

[0071] In addition, the base 350 protrudes from each of the upper corners to be attached to the inside of the cover can 100. A fixing protrusion 351 is formed to contact the outer surface of the housing 310. The protrusions 351 guide the cover can 100 and / or the housing 310 to be easily fastened. At the same time, it can be firmly fixed after fastening. If it is in contact with the outer surface of the housing, When the fixing protrusion is formed so as to be fixed to the contact surface, the fixing protrusion is located at a position spaced a certain distance from the contact surface. The housing is provided with a first coil portion so that the outer surface of the housing and the first coil portion do not interfere with each other. It can be.

[0072] In addition, the base 350 is connected to the fastening hole 342 and / or fastening groove of the substrate 340. A corresponding fastening protrusion 352 is formed on the upper surface of the base plate 340, and a hole is formed on the lower surface of the base plate 340. The hall sensor receiving grooves 355 each capable of receiving a sensor portion 500 are formed.

[0073] Although not shown, the base 350 has a fastening piece of the cover can 100 inserted therein. Such a fastening groove is formed in a shape corresponding to the length of the fastening piece. The cover can includes the fastening piece formed locally on the outer surface of the base 350 or the fastening piece. The outer surface of the base 350 is formed so that a predetermined portion of the lower end of the It is possible.

[0074] The base 350 also serves as a sensor holder for protecting an image sensor (not shown) which will be described later. In this case, the base 350 may be provided with a lower protruding portion along the side of the base 350. The base 350 is provided with a filter 360. This may also be done.

[0075] 1 to 3 and 8, the elastic unit 400 includes an upper spring 410 and Only the bobbin 210, not the housing 310, includes the lower spring 420 and the AF drive and / or Alternatively, the side springs do not need to be provided since they move when the OIS is driven.

[0076] The upper spring 410 and the lower spring 420 are located at the respective sides of the housing 310. For production efficiency, however, a single plate is generally used. It may be made of a leaf spring that is bent and cut into shape.

[0077] Therefore, the upper spring 410 is in contact with the upper surface 311 of the housing 310 and the bobbin 2 10, and the lower spring 420 is fixed at one end and the other end to the upper surface of the housing 10. One end and the other end are fixed to the lower surface of ring 310 and the lower surface of bobbin 210, respectively.

[0078] Here, the upper spring 410 is disposed on the upper surface 311 of the housing 310 and The coupling protrusion 311a and the corresponding coupling groove 411aa and / or the fusion protrusion 311b ... the corresponding coupling groove 411aa and the corresponding coupling groove 411aa and the corresponding coupling groove 411aa and the corresponding coupling protrusion 311b and the corresponding coupling groove 411aa and the corresponding coupling The outer portion 411a is formed with a fusion groove 411bb corresponding to the outer portion 411a, and the outer portion 411b is fixed to the upper surface of the bobbin 210. and a connecting portion 412b connecting the outer portion 411a and the inner portion 412a. The inner portion 412a corresponds to the shape of the upper surface of the bobbin 210. The outer portion 411a is formed in a substantially circular shape so as to be supported by the shape of the housing 310. It has a substantially rectangular shape.

[0079] That is, the upper spring 410 is in contact with the upper surface of the housing 310 and the upper surface of the bobbin 210. 3, the bobbin 210 is supported by the step portion 311c of the housing 310. The recess 353 of the base 350 has a structural shape that is substantially parallel to the z-axis of the bobbin 210. The upper spring 410 provides a restoring force not only when the upper spring 410 moves upward but also when the lower spring 410 moves downward. The portion 413a is bent so as to have the same elastic force with respect to the x-axis and / or the y-axis. This allows for omnidirectional drive of the bobbin 210 without the need for side springs. Here, all directions of the bobbin include the vertical direction (z-axis direction) and / or the horizontal direction ( The upper spring 410 and the lower spring 420 are arranged in the x-axis horizontal direction and / or the y-axis vertical direction. The side springs 420 are each formed from a single leaf spring and have the same thickness.

[0080] In addition, the first coil portion 320 can be directly soldered to the substrate 340. Therefore, the upper spring 410 or the lower spring 420 is electrically connected to the first coil portion 320. Since there is no need to connect to the spring, it can be realized with a single plate spring, simplifying assembly. , enhanced durability, reduced production costs, etc. Therefore, the lower spring 420 is also The first coil may be formed the same as the upper spring 410. The outer portion of the lower spring may be electrically connected to the substrate. stomach.

[0081] That is, the lower spring 420 is disposed on the lower surface of the housing 310, and the coupling The coupling groove 421aa corresponds to the protrusion 311a, or the fusion protrusion 311b corresponds to the fusion protrusion 311b. The outer portion 421a in which the groove 421bb is formed and the inner portion 421b fixed to the upper surface of the bobbin 210 a side portion 422a, a connecting portion 423a connecting the outer portion 421a and the inner portion 422a; The inner portion 422a is substantially circular so as to correspond to the shape of the lower surface of the bobbin 210. The outer portion 421a is substantially rectangular so as to be supported by the shape of the housing 310. It consists of shape.

[0082] The lower spring 420 is in contact with the lower surface of the housing 310 and the lower surface of the bobbin 210. The bobbin 210 is supported by the step portion 311c of the housing 310. Due to the structural shape of the recessed portion 353 of the housing 310, the z-axis of the bobbin 210 is The lower spring can provide a restoring force not only when the spring moves upward but also when the spring moves downward. The connecting portion 423a of 420 is oriented so as to have the same elastic force in the x-axis and / or y-axis. This allows the bobbin 210 to be bonded in all directions without the need for side springs. Here, all directions of the bobbin include the vertical direction (z-axis direction) and / or means the horizontal direction (horizontal direction on the x-axis and / or vertical direction on the y-axis).

[0083] The Hall sensor unit 500 detects the movement of the magnet unit 220, It is provided to sense the position of the mover and precisely control the lens drive motor.

[0084] The hall sensor unit 500 is aligned with the center of the magnet unit 200. Since the displacement of the x-axis and the y-axis must be sensed, the Hall sensor unit 500 is The substrate 340 includes two Hall sensors disposed on adjacent sides of the corners of the substrate 340. The base 350 has a hall sensor receiving groove 3 for receiving each of the hall sensors. 55 is formed. The embodiment includes two Hall sensors, but may include three, four or more. It is also possible.

[0085] In addition, the Hall sensor unit 500 is arranged so that the second coil is closer to the magnet unit 220 than the magnet unit 220. The strength of the magnetic field generated by the magnet is determined by the coil. Considering that the strength of the electromagnetic field formed is several hundred times greater, the movement of the magnet part 220 In sensing, the effect of the second coil section 330 is not taken into consideration.

[0086] Meanwhile, the adhesive described in the embodiment is embodied as a thermosetting epoxy or a UV epoxy. They can be cured by heat or UV exposure. However, heat-curable epoxies can be When used, it is cured by moving it to an oven or by applying heat directly. When using epoxy, the adhesive is hardened by applying UV (ultraviolet) light.

[0087] The adhesive may be an epoxy that can be cured by both heat and UV (ultraviolet) light. It can be cured by either heat or UV (ultraviolet light). The adhesive is not limited to the epoxy, and may be any adhesive that can be cured by bonding. Either material can be used as an alternative, as long as it is compatible with the material.

[0088] The lens drive motor according to the embodiment of the present invention having such a configuration has a lens unit fixed. Only the bobbin 210 that is supported can be driven and moved in all directions of the x, y, and z axes.

[0089] Referring to FIG. 3, the bobbin 210 of the embodiment only moves up and down in the z-axis direction. That is, in the embodiment of the present invention, the bobbin 210 can be moved horizontally. The bobbin can be moved vertically and / or horizontally from a reference position, The lower end of the 210 is disposed at a predetermined distance from the base 350. has a recess 353 to ensure the separation distance.

[0090] Specifically, the movement of the bobbin 210 in the embodiment is caused by a drive signal being individually applied to each second coil. When the voltage is applied, a predetermined portion of the lower end of the bobbin 210 rises and faces the optical axis. Since the part to be treated is lowered, a spatial margin is required below the reference position. Therefore, a vertical and / or a vertical direction is formed between the lower end of the bobbin 210 and the base 350. The key is to provide space that allows horizontal movement.

[0091] Such horizontal movement of the bobbin is controlled as follows.

[0092] Table 1 shows the table when the four second coils are driven independently. Coil 1 and Coil 3 shown in Table 1 below are arranged facing each other on the x-axis. The second coil, Coil 2 and Coil 4, are arranged opposite each other on the y-axis. Coil 2.

[0093] [Table 1]

[0094] In Table 1 above, the variables marked with 0 and 1 represent the on and off states of the applied control signals. but more precisely it can be understood as the difference in input voltage of the applied control signal. The strength of the control signal is set in various ways to control the degree of horizontal movement. It is also possible.

[0095] Referring to FIG. 9, the voltages applied to the second coils can be individually controlled as shown in Table 1. This makes it possible to control the movement for blur correction in the horizontal direction. It is also possible to control horizontal and vertical movements simultaneously. For example, in the above table, If the translation output is -Y, +X, -X, it will move to any position along the -Y axis. While the first coil can be independently powered to the second coil to raise or lower the voltage. When a current is applied to the first coil in the positive direction, the bobbin moves upward and current is applied to the first coil. When the current is applied in the opposite direction, the bobbin moves downward. The position of the movement of the actuator is changed.

[0096] In addition, in the above table, when the output of the movement part is +X, +Y, as shown in Figure 9, It can move horizontally in the line direction.

[0097] In the embodiment, in order to simultaneously drive AF and OIS, This can be achieved by adjusting the applied level of the power supply.

[0098] On the other hand, the coils of the second coil section 330 may be controlled in pairs, as described below. This is shown in Table 2.

[0099] [Table 2]

[0100] The explanation of Table 2 is the same as that of Table 1, and as in Table 2, If you control it with a pair of wheels, you can further increase the driving power. There is.

[0101] In such an embodiment, the lens drive motor may be moved vertically and / or horizontally. The distance is the distance between X1 and X2 shown in FIG. distance between the bobbin 210 and the housing 310), and / or the separation distance between Z1 and Z2 (the distance between the bobbin 210 and the housing 310) The distance between the electrodes is limited to about 50 μm to 200 μm. The vertical travel distance can be about 50 μm to 400 μm. In this way, the distance can be realized.

[0102] In addition, in the embodiment, as described above, the recessed portion 353 is formed in the housing 310, When the OIS is driven, vertical and / or horizontal movement space can be secured.

[0103] Specifically, referring to FIG. 3, in the embodiment, during AF driving, the z-axis is the upper direction. It can be moved not only in the Z1 direction but also in the Z2 direction. Thus, one embodiment for AF drive in both directions can be understood. In this state, in a normal state where no power is applied to the first coil unit 320, the user In most cases, the current and / or voltage is measured at a distance between 50cm and 1m, which is the distance at which the subject is photographed. The wear value of the bobbin 210 in the upward direction can be designed to be minimized. It is important to design Z1 to be greater than the moving distance Z2 of the bobbin 210 in the downward direction in order to achieve efficient For the use of the power supply, it is preferable, but not limited to, the following. The current values ​​or displacements shown are only examples. The weight of the components can be designed differently depending on the environment.

[0104] On the other hand, the lens drive motor according to the embodiment can be attached to a camera module. Such a camera module is suitable for use in mobile phones or laptops, mobile phones with cameras, etc. Various multimedia fields such as talk, PDA, smart toys, etc., It can be installed in image input devices such as surveillance cameras and video tape recorders. can.

[0105] In short, when the lens driving motor according to the embodiment is provided in a camera module, The camera module includes a lens unit, a filter, a printed circuit board, and an image sensor, which are not shown in the figure. The sensor may further include an image sensor.

[0106] A lens unit (not shown) is coupled to the bobbin to be assembled into a camera module. The lens portion may be a lens barrel, but is not limited thereto. The lens may include any holder structure that can accommodate the lens. An example in which the lens barrel is used will be described.

[0107] The lens portion is provided on the upper side of the base 350, and the filter 360 is Or, it is arranged at a position corresponding to the image sensor described later. One or more lenses (not shown) are provided.

[0108] The bobbin 210 is coupled to the lens portion to fix the lens portion. The method of connecting the lens part and the bobbin 210 is as shown in the figure. It is also possible to use a thread coupling method in which the inner peripheral surface and the outer peripheral surface 210a of the lens portion are formed on the same. However, it can also be joined by a threadless method using adhesive. Even with the joining method, adhesive can be used after the threads are tightened to make the attachment even more solid. can.

[0109] The filter 360 is attached to a through hole formed in the center of the base 350. It is possible to use an infrared ray filter or blue light. The filter 360 is made of, for example, a film material or a glass material. The cover glass may be made of a glass material, and may be a flat plate-shaped cover glass for protecting the imaging surface. The optical filter 360 may be provided with an infrared blocking coating material. In addition to the base 350, a separate sensor holder is located below the base 350. You may do so.

[0110] On the other hand, when the filter 360 is provided on the outside of the lens, the filter 360 The lens surface is coated to block infrared rays without the need for a separate structure. Of course, it is also possible to do so.

[0111] The printed circuit board (not shown) has an image sensor (not shown) mounted in the center of the upper surface. Various elements (not shown) for driving the camera module are mounted on the board. There are.

[0112] The image sensor (not shown) is a lens unit that includes one or more lenses (not shown). (not shown) and a center portion of the upper surface of the printed circuit board so that the center portion can be positioned along the optical axis. Such an image sensor can detect an object incident through a lens. The optical signal is converted into an electrical signal.

[0113] As described above, the lens drive motor and / or the camera module according to the embodiment of the present invention The bobbin can move in both tilting and height directions, making the structure The structure is simplified, miniaturization is possible, product costs are reduced, and the efficiency of the applied power is improved. There are advantages to be gained.

[0114] Based on the above description, a person skilled in the art can easily understand the present invention in various ways without departing from the technical concept of the present invention. It is understood that various changes and modifications are possible, and the scope of the present invention will be understood by those skilled in the art. The scope of the present invention is not limited to the above, but is defined by the claims and their equivalents. It should be. [Explanation of symbols]

[0115] 100 Cover Cans 200 mover 210 Bobbin 211 Magnet Hall 212 Fixed piece 220 Magnet section 300 stator 310 Housing 311 Top side 312 Support part 320 First coil section 330 Second coil section 340 Substrate 350 Base 360 Filter 400 Elastic Units 410 Upper spring 420 Lower spring 500 Hall sensor part

Claims

1. base; a bobbin disposed on said base; a first coil and magnet for moving the bobbin through electromagnetic interaction; The first coil is connected to the bobbin and is connected to the base at an initial position where no current is applied to the first coil. an elastic unit for spacing the bobbin from the a cover can including a top plate disposed on the bobbin and a side plate coupled to the base; 、 When a unidirectional current is supplied to the first coil in the initial position, the bobbin is When a current is supplied in the other direction, it moves in the second direction away from the base. Move, The length of a first stroke of the bobbin in the first direction is equal to the length of a first stroke of the bobbin in the second direction. The lens drive motor has a stroke length shorter than the second stroke length.

2. The elastic unit includes an upper spring connected to the upper surface of the bobbin and a lower spring connected to the lower surface of the bobbin.

2. The lens drive motor according to claim 1, further comprising a lower spring coupled thereto.

3. The bobbin includes a fixing piece formed on an upper surface of the bobbin to protrude therefrom, the upper spring includes an inner portion secured to the top surface of the bobbin; The inner portion of the upper spring has a fold formed by partially recessing an inner surface of the inner portion. Including the bent portion, The fixing piece is disposed at the bent portion of the inner portion of the upper spring.

3. The lens drive motor according to claim 2 .

4. a housing disposed over the base; the bobbin is disposed within the base; The housing includes a fastening protrusion formed on an upper surface of the housing, the upper spring includes an outer portion secured to the top surface of the housing; The outer portion of the upper spring includes a coupling groove into which the fastening protrusion is inserted.

4. The lens drive motor according to claim 3.

5. The housing is formed on the upper surface of the housing so as to protrude therefrom and is spaced apart from the fastening protrusion. Including fusion protrusions, The outer portion of the upper spring includes a fusion hole coupled to the fusion protrusion. The lens drive motor according to claim 4 .

6. The fusion protrusion is fastened to the fusion hole of the upper spring and fused to the upper spring by heat.

6. The lens drive motor according to claim 5, wherein the side spring is fixed.

7. The housing has a step portion formed on the upper surface of the housing by being recessed in the optical axis direction. Including, the upper spring includes a connecting portion connecting the inner portion and the outer portion, At least a part of the connecting portion of the upper spring is disposed on the stepped portion of the housing. The step portion is arranged to overlap with the optical axis direction. Item 7. The lens drive motor according to any one of items 4 to 6.

8. The first stroke length is the separation distance between the bottom surface of the bobbin and the top surface of the base. and the second stroke length is the distance between the top surface of the bobbin and the inner surface of the top plate of the cover can.

8. The lens drive device according to claim 1, wherein the distance is motor.

9. The one-way current and the other-way current supplied to the first coil have opposite polarities.

9. The lens drive motor according to claim 1, wherein the lens drive motor is a motor having a diameter of 100 mm or less.

10. 2. The method of claim 1, wherein the base limits movement of the bobbin in the first direction.

10. A lens drive motor according to any one of 1 to 9.

11. The cover can limits movement of the bobbin in the second direction. Item 11. A lens drive motor according to any one of items 1 to 10.

12. The cover can is disposed to surround the bobbin, the first coil, and the magnet. The lens driving motor according to any one of claims 1 to 11, 。

13. A substrate disposed on an upper surface of the base; and a second coil disposed on the substrate and facing the magnet; the first coil receives power and moves the bobbin in the optical axis direction; the second coil receives power and moves the bobbin in a direction perpendicular to the optical axis direction; The magnet includes four magnets arranged at regular intervals on the outer surface of the bobbin. 、 The second coils are arranged so as to face the lower surface of one of the four magnets. and four second coils arranged on the first coil and receiving a power supply individually; The board is a flexible printed circuit board (FPCB) with an opening in the center. it Board), The substrate is bent at least on one side to form a terminal portion for receiving power from an external source. Including, The base is formed on an outer surface of the base, and the terminal portion is seated on the terminal. Including a groove, The substrate has a first terminal portion electrically connected to the first coil and a second terminal portion electrically connected to the second coil. a second terminal portion connected to the first terminal portion, The first terminal portion and the second terminal portion are formed on an upper surface of the substrate.

13. A lens drive motor according to any one of claims 1 to 12.

14. Printed circuit board; an image sensor disposed on the printed circuit board; 14. The lens driving device according to claim 1, wherein the lens driving device is disposed on the printed circuit board. and The camera further comprises a lens coupled to the bobbin of the lens driving device. Module.

15. A mobile terminal comprising the camera module of claim 14.

16. base; a bobbin disposed on said base; a first coil and magnet for moving the bobbin through electromagnetic interaction; The first coil is connected to the bobbin and is connected to the base at an initial position where no current is applied to the first coil. an upper spring separating the bobbin from the a cover can including a top plate disposed on the bobbin and a side plate coupled to the base; 、 When a current in the reverse direction to that of the first coil is supplied to the bobbin at the initial position, the bobbin is When a positive current is applied, the electrode moves downward and approaches the top plate of the cover can. Move upwards, The distance of movement of the bobbin in the upward direction is greater than the distance of movement of the bobbin in the downward direction. The lens drive motor is characterized by its large size.

17. a housing disposed over the base; the bobbin is disposed within the base; The housing includes a fastening protrusion formed on an upper surface of the housing, the upper spring includes an outer portion secured to the top surface of the housing; The outer portion of the upper spring includes a coupling groove into which the fastening protrusion is inserted.

17. The lens drive motor according to claim 16.

18. The housing is formed on the upper surface of the housing so as to protrude therefrom and is spaced apart from the fastening protrusion. Including fusion protrusions, The outer portion of the upper spring includes a fusion hole coupled to the fusion protrusion. The lens drive motor according to claim 17 .

19. The fusion protrusion is fastened to the fusion hole of the upper spring and fused to the upper spring by heat. The lens drive motor according to claim 18, wherein the side spring is fixed.

20. The bobbin includes a fixing piece formed on an upper surface of the bobbin to protrude therefrom, the upper spring includes an inner portion secured to the top surface of the bobbin; The inner portion of the upper spring has a fold formed by partially recessing an inner surface of the inner portion. Including the bent portion, The fixing piece is disposed at the bent portion of the inner portion of the upper spring.

20. The lens drive motor according to claim 16,

21. base; a bobbin disposed on said base; a first coil and a magnet that move the bobbin through electromagnetic interaction; and The first coil is connected to the bobbin and is connected to the base at an initial position where no current is applied to the first coil. a lens driving motor including an elastic unit for separating the bobbin from the lens driving motor.

Images