Lens drive 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] Embodiments of the present invention relate to a lens driving motor with an improved structure.

Background Art

[0002] As various portable terminals have become widespread and wireless Internet services have been commercialized, consumer needs related to portable terminals have diversified, and as a result, various types of attachment devices are attached to portable terminals.

[0003] Among them, a typical one is a camera module that can photograph a subject with a photo or moving image, save the image data, and then, as needed, edit and transfer it.

[0004] In recent years, the demand for small camera modules has been increasing for use in various multimedia fields such as notebook computers, mobile phones with cameras, PDAs, smart toys, and further, image input devices such as surveillance cameras and video tape recorders.

[0005] A camera module includes a lens driving motor, and such a lens driving motor can perform autofocusing and shake correction. The existing lens driving motor has additional components for the OIS (Optical Image Stabilization) configuration, so the internal structure of the lens driving motor is relatively complex, and the assembly flow line of such a lens driving motor becomes complicated.

[0006] Also, such structural complexity may limit the miniaturization of the lens driving motor and cause limitations in reducing product reliability and product cost.​ [Overview of the project] [Problems that the invention aims to solve]

[0007] The embodiment is an OIS-type lens drive with improved reliability, taking into consideration miniaturization and simplification. The objective is to provide motors. [Means for solving the problem]

[0008] An example of the present invention is a lens drive motor comprising a movable element including a magnet section, and the magnet A stator including a first coil section and a second coil section arranged to face the coil section, Including, the stator includes a housing that movably accommodates the movable element inside, and the housing A base that supports the coil, and located on one side of the base, the first coil portion and the second It may include a circuit board that supplies power to the coil section.

[0009] The first coil portion is located in the housing, and the second coil portion is located on the substrate. It can be positioned.

[0010] A hose is positioned opposite the magnet section and senses the phase of the movable element. It may further include a light sensor unit.

[0011] The second coil section is located on the upper side of the substrate, and the Hall sensor section is located on the lower side of the substrate. The base is positioned on a surface and includes a Hall sensor housing groove in which the Hall sensor portion is housed. It is possible.

[0012] The Hall sensor section comprises two Hall sensors arranged on two adjacent sides of the substrate. It can include a nsa.

[0013] The substrate is a FPCB (Flexible Printed Circuit Board), and the substrate is formed by bending on at least one side and includes a terminal portion for receiving power supply from the outside. The base may include a terminal groove on one side where the terminal portion is seated. The substrate may include a first terminal portion electrically connected to the first coil portion and a second terminal portion electrically connected to the second coil portion. The second coil portion may include four FP (Fine Pattern) coils to which power is individually applied.

[0014] The mover further includes a bobbin that houses a lens portion inside and is provided with the magnet portion, and may further include an upper spring connecting the upper surface of the housing and the upper surface of the bobbin, and a lower spring connecting the lower surface of the housing and the lower surface of the bobbin. The upper spring and the lower spring may include an outer portion coupled to the housing, an inner portion coupled to the bobbin, and a connecting portion connecting the outer portion and the inner portion.

[0015] The upper surface of the housing may be provided with a stepped portion recessed in a region where the connecting portion overlaps. The upper surface of the bobbin is provided with a protruding fixing piece, and the inner portion may include a bent portion bent to surround the outer surface and both side surfaces of the fixing piece.

[0016] The mover further includes a bobbin that houses a lens portion inside and is provided with the magnet portion, and may further include an upper spring connecting the upper surface of the housing and the upper surface of the bobbin, and a lower spring connecting the lower surface of the housing and the lower surface of the bobbin. The upper spring and the lower spring may include an outer portion coupled to the housing, an inner portion coupled to the bobbin, and a connecting portion connecting the outer portion and the inner portion. The upper surface of the housing may be provided with a stepped portion recessed in a region where the connecting portion overlaps. The upper surface of the bobbin is provided with a protruding fixing piece, and the inner portion may include a bent portion bent to surround the outer surface and both side surfaces of the fixing piece.

[0017] The upper spring and the lower spring may include an outer portion coupled to the housing, an inner portion coupled to the bobbin, and a connecting portion connecting the outer portion and the inner portion. The upper surface of the housing may be provided with a stepped portion recessed in a region where the connecting portion overlaps. The upper surface of the bobbin is provided with a protruding fixing piece, and the inner portion may include a bent portion bent to surround the outer surface and both side surfaces of the fixing piece.

[0018] The upper surface of the housing may be provided with a stepped portion recessed in a region where the connecting portion overlaps. The upper surface of the bobbin is provided with a protruding fixing piece, and the inner portion may include a bent portion bent to surround the outer surface and both side surfaces of the fixing piece.

[0019] The upper surface of the bobbin is provided with a protruding fixing piece, and the inner portion may include a bent portion bent to surround the outer surface and both side surfaces of the fixing piece. The upper surface of the bobbin is provided with a protruding fixing piece, and the inner portion may include a bent portion bent to surround the outer surface and both side surfaces of the fixing piece.

[0020] The upper and lower springs can each be integrally formed leaf springs. ru.

[0021] The movable element further comprises a bobbin that has the magnet part and houses the lens part inside. The bobbin includes a rotation prevention portion protruding from its outer circumferential surface, and the housing is the The outer surface of the bobbin can be positioned at a distance from the anti-rotation part.

[0022] A lens drive motor according to another embodiment of the present invention includes a bobbin for fixing the lens portion, and the A movable element including a magnet portion arranged on a bobbin; corresponding to the magnet portion The first coil section and the second coil section are arranged separately, and the upper surface has an opening in the center and the A housing including a support portion on which a first coil portion is positioned on the outer surface, and a support portion supporting the housing A base is formed in the center, with a through hole corresponding to the lens portion, and the upper part of the base A solid body including a substrate positioned on the side and for applying power to the first coil section and the second coil section. Teishi; can be included.

[0023] A hose is positioned opposite the magnet section and senses the phase of the movable element. It may further include a light sensor unit.

[0024] The magnet section includes four magnets arranged at equal intervals on the outer surface of the bobbin. Furthermore, the bobbin has a magnet groove formed on its outer surface, into which each of the magnets is mounted. It can be done. [Effects of the Invention]

[0025] According to embodiments of the present invention, the housing is fixed and only the bobbin is driven in all directions. Therefore, the internal configuration has been simplified, miniaturized, and the reliability of the lens drive motor or camera motor has been improved. It is possible to materialize Joules. [Brief explanation of the drawing]

[0026] [Figure 1] This is an exploded perspective view of a lens drive motor according to an embodiment of the present invention. [Figure 2] This figure shows the lens drive motor according to an embodiment of the present invention with the cover can removed. [Figure 3] This is a side cross-sectional view of a lens drive motor according to an embodiment of the present invention. [Figure 4] This diagram shows the coupling state between the housing and bobbin of a lens drive motor according to an embodiment of the present invention, viewed from above. [Figure 5] This is a perspective view showing the coupling state between the base and the second coil portion of the lens drive motor according to an embodiment of the present invention. [Figure 6] Figure 5 is a perspective view showing the coupling state between the substrate and the second coil section. [Figure 7] This figure shows a magnet section, a Hall sensor section, a substrate, and a base according to an embodiment of the present invention. [Figure 8] This is an upper side view of an elastic unit according to an embodiment of the present invention. [Figure 9] This graph schematically shows the displacement caused by a change in the current applied to the first coil portion of the lens drive motor according to an embodiment of the present invention. [Figure 10] This figure shows the movement path of the lens drive motor according to an embodiment of the present invention. [Modes for carrying out the invention]

[0027] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0028] Unless otherwise specified, all terms used herein are in the general sense as understood by those skilled in the art. It is identical in meaning to the general meaning of the term, and if the term used herein is identical to the general meaning of the term In case of taste conflict, the definitions used herein shall be followed.

[0029] However, the invention described below is merely for illustrating embodiments of the present invention. This is not intended to limit the scope of the rights of the present invention, and is consistent throughout the entire specification. The reference numbers used indicate identical components.

[0030] The lens drive motor in the embodiment will now be described in detail with reference to the drawings. That's right.

[0031] Figure 1 is an exploded perspective view of a lens drive motor according to an embodiment of the present invention, and Figure 2 is an exploded perspective view of a lens drive motor according to an embodiment of the present invention. Figure 3 shows the lens drive motor with the cover can removed, which is part of an embodiment of the present invention. Figure 4 shows a side cross-sectional view of the lens drive motor according to an embodiment of the present invention. Figure 5 shows the coupling state between the housing and the bobbin from above, and is an embodiment of the present invention. A perspective view showing the coupling state between the first terminal portion 341a and the second coil portion of the drive motor. Figures 1 and 6 are perspective views showing the coupling state between the substrate in Figure 5 and the second coil section, and Figure 7 shows the present invention. Figure 8 shows the magnet section, Hall sensor section, substrate, and base according to this embodiment. Figure 9 is an upper side view of an elastic unit according to an embodiment of the invention, and Figure 9 is a lens according to an embodiment of the present invention. This graph schematically shows the displacement caused by a change in the current applied to the first coil of the drive motor. Figure 10 shows the movement path of a lens drive motor according to an embodiment of the present invention.

[0032] Referring to Figure 1, the lens drive motor according to this embodiment is broadly composed of a movable element 200 and a fixed element. The embodiment also includes a stator 300. It includes, and further includes, a Hall sensor unit 500. In this embodiment, the z-axis is the optical axis. This means that the x-axis is perpendicular to the z-axis, and the y-axis is perpendicular to both the z-axis and the x-axis. do.

[0033] Referring to Figures 1 and 3, the cover can 100 is a movable element 200 and a stator, which will be described later. It accommodates the 300, and an opening is formed on the upper side that exposes the lens section (not shown), which will be described later. The lower side is open and closed by the base 350, which will be described later, thus controlling the lens drive The appearance of a motor can be formed.

[0034] As shown in the figure, the cover can 100 has an opening formed on its upper side and an open lower side. It may be formed in the shape of a rectangular parallelepiped, but the shape of such a cover can 100 can be formed in a variety of ways. It is possible. In short, the shape of the cover can 100 is a quadrangular shape when viewed from above. It may also be octagonal in shape, but is not limited to this.

[0035] The inner surface of the cover can 100 is in close contact with the side and / or top surface of the base 350, which will be described later. The base 350 then closes all or part of the lower surface, protecting the interior from external impacts. It protects the components of the unit while simultaneously preventing the penetration of external contaminants.

[0036] Furthermore, although not shown in the diagram, the cover can 100 also includes fastening pieces (not shown). This can be done, and this can be formed at least on the lower end of one surface. On the other hand, base 35 0 has a fastening groove (not shown) formed on its side into which the fastening piece is inserted, and the lens drive motor This enables the realization of even more robust sealing and fastening functions.

[0037] Furthermore, the cover can 100 protects the lens from external radio wave interference generated by mobile phones, etc. It can also serve the function of protecting the components of the motor. Therefore, the cover can 1 00 may be formed from a metal material, but may be an injection-molded product or an insert injection-molded product using a metal material. It can be formed from a variety of materials.

[0038] The movable element 200 includes a bobbin 210 and a magnet section 220.

[0039] Referring to Figures 1 to 4, the bobbin 210 has the respective markings on its outer peripheral surface 210a. A magnet groove 211 into which a magnet is fitted is formed, and such a magnet groove 211 It can be formed to correspond to the shape of the magnet, or the magnet can be fixed in place. A secure attachment area may also be formed.

[0040] Also, although not shown in the illustration, the upper and / or lower surfaces of the bobbin 210 are as described below. The upper spring 410 and / or the Alternatively, fastening projections (not shown) that fasten to the inner parts 412a and 422a of the lower spring 420 are shaped The fastening projection may be circular, square, or a combination thereof.

[0041] Also, referring to Figure 4, the bobbin 210 has at least one or more on its outer surface 210a. A protruding anti-rotation portion 213 is formed. On the other hand, the anti-rotation portion 213 is, as an example, 4 It can be formed in one. In this embodiment, the AF drive and / or OIS drive are bobbin 2 Since it is realized with only 10 movements, the bobbin 210 can have a rotation prevention part 213 formed on it. That is what it is.

[0042] In other words, when the bobbin 210 moves with respect to the x and y axes, the outer surface 210 of the bobbin 210 a and the anti-rotation part 213, together with the inner circumferential surface of the housing 310, mitigate the impact on 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 anti-rotation part 213 and the inner surface of the housing 310 come into contact, mitigating the rotation and the resistance to the x and y axes. Impact in the angular direction occurs when the outer surface 210a of the bobbin 210 and the inner surface of the housing 310 come into contact. The impact of rotation is mitigated by the opening of the rotation prevention part 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 provide relief.

[0043] Also, referring to Figure 4, impact protection against the x-axis and / or y-axis is provided by the bobbin and howe. The straight section D of the sing can be used, and the influence on the diagonal section is on the bobbin and howe. The rounded part R of the jigging can be utilized, and impact against the rotating part Impact prevention can be achieved by using a stopper S located between the straight section and the rounded section.

[0044] Furthermore, at least two fixing pieces are formed on the upper or lower side of the bobbin 210. 212 is formed, and the upper spring 410 or lower spring 4, which will be described later, is attached to these fixing pieces 212. The folded portions 412aa and 422aa of the inner parts 412a and 422a of 20 are positioned here. These fixing pieces 212 may also be formed on the lower side surface of the bobbin 210, and the fixing pieces 212 and The bent portions 412aa and 422aa are connected to the bobbin 210 and the upper spring 410 or the lower This guides the assembly of spring 420 and ensures a secure fixation. ru.

[0045] Referring to Figures 1 and 3, the magnet portion 220 is arranged on the bobbin 210. The bobbin 210 includes four magnets arranged at equal intervals on its outer surface. Each magnet is fixed to the outer surface of the bobbin 210 with adhesive, or the bobbin It can be inserted into the magnet groove 211 of n210 and fixed in place, and in the latter case, adhesive is used, the magnet It can also be applied to the net groove 211 or the bottom and / or sides of the magnet for fixation. Cut.

[0046] Furthermore, as shown in the figure, the magnet portion 220 is located on the outer surface of the bobbin 210. They may be arranged in a manner, but they are mounted at equal intervals at the four corners of the bobbin 210, and the internal volume is efficiently utilized. It can be used in a suitable manner.

[0047] The shape of the magnet may be a triangular prism, a rectangular prism, a trapezoidal prism, or even a rectangular prism. It can also include some curves in a prismatic shape. Furthermore, the magnet has corners that are one It can also be processed to have a curved surface.

[0048] In this embodiment, each of the magnets is a magnet whose N pole and S pole are magnetized horizontally. It may also be a magnet, and the structural shape of such a magnet and the first coil described later The part 320 and the second coil part 330 interact according to Fleming's left-hand rule, The bobbin 210 can be moved. Specifically, the magnet moves the bobbin The direction of 210 is magnetized to the north pole, and the direction of the first coil portion 320 is magnetized to the south pole, and the opposite magnetization Direction is also possible. In such a case, the first coil section 320 is subjected to power, The bobbin 210 fixed to the magnet is moved in the z-axis direction, and the second coil section 3 30, when power is applied, moves the bobbin 210 fixed to the magnet along the x axis and / or It can be moved along the y-axis.

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

[0050] Referring to Figures 1 to 3, the first coil section 320 and the second coil section 330 are, They are arranged to correspond to the magnet section 220.

[0051] Specifically, the first coil portion 320 faces the outer surface of the magnet portion 220. They are arranged to be wound directly into the housing 310 described later, or pre-wound A coil is attached and positioned. This first coil section 320 is AF (Auto It may also be a Focusing coil, and power is applied from the circuit board 340 described later. , through interaction with the magnet portion 220 arranged on the bobbin 210, the bobbin 210 It can be moved along the optical axis.

[0052] The first coil portion 320 is arranged on the outer surface of the support portion 312 of the housing 310, which will be described later. It is placed and secured by a guide rib 312b formed at the lower end of the support portion 312. Such a first coil section 320 is wound around the support section 312, and the first coil section is pre-wound. The coil portion 320 of 1 may be attached to the support portion 312.

[0053] Alternatively, four individual first coils are arranged on the outer surface of the housing 310 at 90° intervals. They may be placed. One end and the other end of the wound coil of such a first coil section 320 are The first terminal portion 344 on the circuit board 340, which will be described later, is electrically connected and power is applied to it. This is possible. Methods using conductive materials, including bonding by epoxy or soldering, are possible. It may be used for the electrical connection between the first coil section 320 and the first terminal section 344.

[0054] Referring to Figures 1 and 4 to 6, the second coil portion 330 is the magnet It can be placed on the substrate 340, which will be described later, so as to correspond to the lower side surface of part 220. The second coil section 330, such as the one shown, is placed on the substrate as OIS (Optical Image Processing Unit). (ge Stabilization) coil. Also, the second coil part 330 may be provided individually on each side of the substrate 340, in which case a power supply may be provided individually. There may be four second coils to which the current is applied. Also, the second coil section 330 is F It can be formed with a P (Fine Pattern) coil. Also, the second coil One end and the other end are electrically connected to a second terminal portion 343 formed on the substrate 340, which will be described later. It can be connected and powered. By epoxy or soldering, etc. Methods using conductive materials, including adhesives, may be used for electrical connections.

[0055] Referring to Figures 1 to 4, the housing 310 has an upper surface 311 that is open in the center and The first coil portion 320 is formed at the corners of the upper surface 311 and is arranged on the outer surface. It includes a support portion 312 to which it is placed.

[0056] Specifically, the upper spring 410 is fastened to the upper surface 311 of the housing 310. The connecting projection 311a and / or the fused projection 311b to which the upper spring 410 is fixed. These are formed. When the upper spring 410, which will be described later, is positioned, these connecting protrusions 311a are on the outside. The arrangement of part 411a can be easily guided. Also, the connecting projection 311a is This ensures that the bobbin can move in the direction of the optical axis, that is, the bobbin However, it is possible to secure space that allows movement away from the base, as will be described later, and The upper surface of the connecting projection 311a can come into contact with the inner surface of the cover can 100.

[0057] The aforementioned fusion projection 311b is fastened to the fusion groove or fusion hole of the upper spring 410, which will be described later. Then, by applying heat and fusing them together, the upper spring 410 can be firmly positioned. The bonding projections 311a and / or fusion projections 311b are both shown on the upper surface 311. However, only one of them may be formed on the upper surface 311 of the housing 310, in which case, The upper spring and housing are fixed together, while simultaneously providing space for the upper spring to move upwards. It is also possible to secure this. Furthermore, it is formed on the lower side of the housing 310, and the lower It can also be fastened in the same way as the side spring 420.

[0058] Furthermore, the outer portions 411a and 421a are connected to the upper surface 311 of the housing 310. When joined, a stepped portion 311c is formed on the upper surface 311, which is recessed in the optical axis direction. The stepped portion 311c is formed when the bobbin 210 moves in the -Z direction, which is downward from the optical axis. The inner parts 412a, 422a and connecting parts 413a, 42 of the upper spring 410 move together. The structural shape takes 3a into consideration. In other words, in the downward direction, the bobbin is as described later. It may also be in a direction that approaches the base. Also, the base 340 for a similar function The recessed portion 353 will be described later.

[0059] Furthermore, the inner surface of the housing 310 has a shape that corresponds to the outer surface of the bobbin 210. The inner surface of the housing is formed, and the inner surface of the housing is formed at a predetermined distance from the outer surface of the bobbin. This is achieved. In other words, the inner surface of the first coil portion 320 fixed to the housing 310 is The outer surface of the magnet part fixed to the bobbin is separated by a certain distance. The inner surface of the housing 310 is 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, and such a structural shape includes the direction of rotation. It has advantages in mitigating impact in all directions.

[0060] Furthermore, the support portion 312 of the housing 310 is located at the lower corner of the upper surface 311. It is formed and can be integrally formed by injection molding or the like. Here, the support part 312 is a corresponding surface 312a that is separated by a certain distance from the fixing projection 351 of the base 350, which will be described later. In this case, the first coil portion 320 is arranged on the support portion and is octagonal. The portion having a shape, or positioned on the corresponding surface, has a curved shape, and is on the side of the housing. Furthermore, the parts positioned at the support sections on both sides may have a linear shape.

[0061] Furthermore, the lower end of the support portion 312 of the housing 310 is the first coil portion 320 Guide ribs 312b are formed to support the winding or mounting of the first coil. It can be fixed in place.

[0062] Since such a housing 310 is fixed even when the OIS is driven, the cover can It can be realized as an integral part or as a single component with 100. That is, the cover can 100 and This eliminates the need for a separation space between the housing 310 and the product, significantly reducing the product's volume. can.

[0063] Referring to Figures 1, 5, and 6, the substrate 340 is located above the base 350, which will be described later. It is arranged on the surface and can apply power to the second coil section 330, and the first coil Power can also be applied to section 320.

[0064] Specifically, the upper surface of the substrate 340 is a first terminal for applying power from an external source. The terminal portion 341a and / or the second terminal portion 341b are formed by bending downwards. Then, power is applied from another power supply board 340 or from an external source to the second coil section 330 and Power can be applied to the and / or first coil section 320. The lower side of the substrate 340 The Hall sensor portion 500 is mounted on the surface, and the first terminal portion 341a and / Alternatively, it is electrically connected to the second terminal section 341b.

[0065] These first terminal section 341a and second terminal section 341b are connected to the Hallsen The two Hall sensors of section 500 are formed on the edges of the substrate, excluding the edges where they are located. While this is desirable for securing space efficiently, it is not the only option.

[0066] Such a substrate 340 has an FPCB with an opening in the center corresponding to the lens portion and the z-axis. This is embodied in a Flexible Printed Circuit Board. can.

[0067] Furthermore, such a substrate 340 is designed to be easily fixed to the base 350, which will be described later, with a small amount of material. At the very least, one or more fastening holes 342 or fastening grooves are formed, and the base 350, which will be described later, A fastening projection 352 corresponding to the fastening hole 342 or fastening groove is formed. The shape of the groove, fastening groove, and fastening projection may be circular or square, in the case of a square shape. They may have a rectangular shape, and there may be at least two of them, and their positions may be It can be placed in the corner.

[0068] Furthermore, in such a substrate 340, each coil of the second coil section 330 is electrically The second terminal portion 343, which can be connected to the first coil portion 320, is electrically connected to the coil of the first coil portion 320. A first terminal portion 344 that can be connected is formed on the upper side. The first terminal portion 344 may be formed on the upper surface of the substrate 340, The second terminal portion 343 is electrically connected to each of the second coils, This may be formed. In other words, since the coil has one end and the other end, each of the aforementioned solders The ring section can accommodate a pair of soldering points. If two of the four second coils are electrically connected, then two second coils The two soldering points can be paired together.

[0069] Referring to Figures 1 to 3 and Figure 5, the base 350 supports the movable element 200. And, in the center, it is separated by a predetermined distance from the lower surface of the bobbin 210. Specifically, the base 3 50 supports the housing 310 and is separated from the lower surface of the bobbin 210 at a predetermined distance in the center. A recessed portion 353 is formed on the lower side so that it can be positioned at a distance from the other part, and the recessed portion 35 A through hole corresponding to the lens portion is formed in the center of 3. In other words, the recess portion 353 can secure space for the bobbin to move downward, or design Accordingly, if there is space for the bobbin to move downward even without the recess, The recessed portion is not a required component.

[0070] Furthermore, one side of the base 350 is the first terminal portion 341a to which the first terminal portion 341a is attached. The first terminal groove 354 and the second terminal portion 341b to which the second terminal portion 341b is attached Terminal grooves (not shown) are formed, and these terminal grooves are terminals of the substrate 340. The first terminal groove 354 and / Alternatively, the second terminal groove is provided so that the terminal portion 341 of the substrate does not protrude outward. The depth of the terminal groove 354 may be such that if there are two terminal portions 341, the terminal portion 341 is such that Terminal grooves 354 are formed on two sides of the - in this case, two terminal grooves 35 Number 4 is formed on opposite sides.

[0071] Furthermore, the base 350 protrudes from each of its upper corners, and is located inside the cover can 100. A fixing projection 351 is formed that contacts the surface or the outer surface of the housing 310, and such fixing The projection 351 facilitates fastening of the cover can 100 and / or housing 310. At the same time, after fastening, a firm fixation can be achieved. If the outer surface of the housing is in contact with the housing If a fixing projection is formed in such a manner, it will be positioned at a certain distance from the contact surface. It is positioned in the first coil section, so that the outer surface of the housing and the first coil section do not interfere with each other. It can be done.

[0072] Furthermore, the base 350 is connected to the fastening holes 342 and / or fastening grooves of the substrate 340. A corresponding fastening projection 352 is formed on the upper surface, and a hole is located on the lower side of the substrate 340. Each of the sensor units 500 is housed in a Hall sensor housing groove 355.

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

[0074] Furthermore, the base 350 protects the image sensor (not shown), which will be described later. It can perform the function of a holder, in which case it protrudes downward along the side of the base 350. An outward protrusion is formed. Furthermore, the base 350 is provided for positioning the filter 360. It's okay if it's done that way.

[0075] Referring to Figures 1 to 3 and Figure 8, the elastic unit 400 is connected to the upper spring 410. Including the lower spring 420, only the bobbin 210, not the housing 310, is used for AF drive and / Alternatively, since it moves when the OIS is activated, the side springs do not need to be provided.

[0076] The upper spring 410 and the lower spring 420 are located on the respective sides of the housing 310. It may consist of separate springs arranged in a single sheet metal, but for production efficiency, It can be formed from a leaf spring consisting of bent and cut shapes.

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

[0078] Here, the upper spring 410 is positioned on the upper surface 311 of the housing 310, and The corresponding coupling groove 411aa and / or the fusion projection 311b The outer portion 411a, in which the corresponding fusion groove 411bb is formed, and the upper surface of the bobbin 210 are fixed The defined inner portion 412a and the connecting portion 4 that connects the outer portion 411a and the inner portion 412a 13a and the inner portion 412a corresponds to the shape of the upper surface of the bobbin 210. It is roughly circular in shape, and the outer part 411a can be supported in the shape of the housing 310. The sea urchin is roughly square in shape.

[0079] In other words, the upper spring 410 is located on the upper surface of the housing 310 and the upper surface of the bobbin 210. It is fastened to the bobbin 210 and the stepped portion 311c of the housing 310 mentioned above. Furthermore, due to the structural shape of the recess 353 of the base 350, the z-axis of the bobbin 210 is referenced. In addition to upward movement, it also provides a restoring force when moving downward. Furthermore, the connection of the upper spring 410 Part 413a is bent to have the same elastic force with respect to the x-axis and / or y-axis. This allows for the formation of a bobbin 210 that does not require side springs, enabling omnidirectional drive. Here, all directions of the bobbin refer to the vertical direction (z-axis direction) and / or the horizontal direction ( This refers to the horizontal direction of the x-axis and / or the vertical direction of the y-axis. Also, the upper spring 410 and the lower Each side spring 420 is formed from a single leaf spring and has the same thickness.

[0080] Furthermore, the first coil section 320 has a structure that allows it to be directly soldered to the substrate 340. Therefore, the upper spring 410 or the lower spring 420 has electrical contact with the first coil portion 320. Since it does not require communication with other components, it can be implemented with a single plate spring, simplifying assembly. This offers advantages such as enhanced durability and reduced product costs. Therefore, the lower spring 420 is also, The upper spring 410 can be formed identically to the lower spring. Alternatively, the first coil can be formed identically to the lower spring. The outer part of the lower spring is electrically connected to the substrate, and the outer part of the lower spring is electrically connected to the substrate. stomach.

[0081] In other words, the lower spring 420 is positioned on the lower side of the housing 310, and the coupling A coupling groove 421aa corresponding to the projection 311a, or a fusion corresponding to the fusion projection 311b The outer portion 421a has a groove 421bb formed on it, and the inner portion is fixed to the upper surface of the bobbin 210. The side portion 422a and the connecting portion 423a that connects the outer portion 421a and the inner portion 422a, The inner portion 422a is approximately circular in shape to correspond to the shape of the lower surface of the bobbin 210. It is shaped such that the outer part 421a is roughly square so as to be supported by the shape of the housing 310. It consists of shapes.

[0082] Furthermore, the lower spring 420 is located on the lower surface of the housing 310 and the lower surface of the bobbin 210. The bobbin 210 is fastened and supports the stepped portion 311c of the housing 310 and the aforementioned Due to the structural shape of the recess 353 of the housing 310, the z-axis of the bobbin 210 is referenced. In addition to upward movement, a restoring force can be provided during downward movement. Also, the lower spring The connecting portion 423a of 420 is designed to have the same elastic force with respect to the x-axis and / or y-axis. It can be formed by winding, and this is all-around of the bobbin 210 without the need for side springs. This is for driving in the direction. Here, all directions of the bobbin refer to the vertical direction (z-axis direction) and / or This refers to the horizontal direction (horizontal direction of the x-axis and / or vertical direction of the y-axis).

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

[0084] The Hall sensor section 500 is positioned in a straight line with the center of the magnet section 200. Therefore, since it is necessary to sense the displacement of the x and y axes, the Hall sensor unit 500 is The circuit board 340 includes two Hall sensors, each positioned on an adjacent side of the board's corners. The base 350 has a Hall sensor housing groove 3 in which each of the Hall sensors can be housed. 55 is formed. The embodiment includes two Hall sensors, but may include three, four or more. It is also possible.

[0085] Furthermore, such a Hall sensor unit 500 is a second carp than the magnet unit 220. It is provided adjacent to the coil section 330, and the strength of the magnetic field formed by the magnet is controlled by the coil. Considering that the strength of the electromagnetic field being formed is several hundred times greater, the movement of the magnet section 220 In sensing, the influence of the second coil section 330 is not taken into consideration.

[0086] On the other hand, the adhesive described in the embodiment is embodied in thermosetting epoxy or UV epoxy. It can be cured by heat or UV exposure. However, thermosetting epoxy When used, it hardens by moving it to an oven or by applying direct heat, and UV (ultraviolet) When epoxy is used, the adhesive is cured by applying UV (ultraviolet) light.

[0087] Furthermore, the adhesive may be an epoxy that can be used in combination with heat curing and UV (ultraviolet) curing. Both heat curing and UV (ultraviolet) curing are possible, and you can choose one of them. The adhesive may be an epoxy that can be cured by bonding. The adhesive is not limited to epoxy, but is an epoxy that can be bonded by bonding. If the substance is suitable, either can be used as a substitute.

[0088] In the lens drive motor according to the embodiment of the present invention, which includes such a configuration, the lens portion is fixed. Only the bobbin 210 can be driven and moved in all directions along the x, y, and z axes.

[0089] Referring to Figure 3, the bobbin 210 of the embodiment moves only upward and downward in the z-axis direction. It is not fixed and can move horizontally. In other words, in the embodiment of the present invention, the bobbin 210 Because the bobbin can move vertically and / or horizontally from its reference position, The lower end of 210 is positioned at a predetermined distance from the base 350, and the base 350 It has a recess 353 to ensure a separation distance.

[0090] Specifically, the movement of the bobbin 210 in the embodiment is driven by individual drive signals to each second coil. When applied, a predetermined portion on the lower end side of the bobbin 210 rises and faces the optical axis. Because the part will be moving downwards, a spatial margin below the reference position is required. Therefore, vertical and / or The requirement is to provide a space that allows for horizontal movement.

[0091] The horizontal movement of such a bobbin is controlled as follows:

[0092] Table 1 shows the table for when each of the four second coils is driven independently. Coil1 and Coil3, as shown in Table 1 below, are arranged opposite each other on the x-axis. The second coil, Coil2 and Coil4, are arranged opposite each other on the y-axis. It is a coil of 2.

[0093] [Table 1]

[0094] In Table 1 above, the variables shown as 0 and 1 represent the on / off state of the applied control signal. It is displayed as such, but more accurately, it can be understood as the difference in the 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 distance. It is also possible.

[0095] Referring to Figure 9, as shown in Table 1, the voltage applied to the second coil can be controlled individually. This allows for control of movement for horizontal image stabilization. It is also possible to control horizontal and vertical movement simultaneously, for example, in the table above. When the output of the moving part is directed to -Y, +X, and -X, it moves to any position along the -Y axis. However, power can be independently applied to the first coil to raise or lower it. When 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 flow direction is reversed, it moves downwards. Depending on the amount of current in the first coil, Bobi The position of n will be changed.

[0096] Furthermore, in the table above, when the output of the moving part is +X and +Y, as shown in Figure 9, diagonally It can move horizontally in the linear direction.

[0097] In this embodiment, in order to perform AF drive and OIS drive simultaneously, the respective coils This can be done by adjusting the power supply application level.

[0098] On the other hand, the coils of the second coil section 330 may be controlled in pairs, as follows: As shown in Table 2.

[0099] [Table 2]

[0100] The explanation for Table 2 is the same as that for Table 1, and as shown in Table 2, two opposing sides If controlled by a pair of units, it has the advantage of being able to further increase the driving power. There is.

[0101] Vertical and / or horizontal movement of the lens drive motor according to this embodiment The distance is the separation distance between X1 and X2 shown in Figure 3 (between the bobbin 210 and the housing 310). The distance between Z1 and Z2 (the 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 them is limited, and the separation distance is such that the horizontal travel distance is approximately 50 μm to 200 μm. It can realize separation and also have a vertical travel distance of approximately 50 μm to 400 μm. This allows for the realization of separation distance.

[0102] Furthermore, as described above, the embodiment includes forming a recess 353 in the housing 310, When OIS is in operation, space for movement in the vertical and / or horizontal directions can be secured.

[0103] Specifically, referring to Figure 3, the embodiment is such that when AF is driven, the movement is upward with respect to the z-axis. It can be moved not only in the Z1 direction but also in the Z2 direction. See Figure 9. This allows us to grasp one embodiment for AF drive in both directions. In this state, when power is not applied to the first coil section 320, the user can... Current and / or voltage are also detected in the vicinity of 50cm to 1m, which is the distance at which many subjects are photographed. The wear value can be minimized by designing the bobbin 210 to be the upper travel distance. It is efficient to design Z1 to be greater than the downward travel distance Z2 of the bobbin 210. For the use of power, this is preferable, but not limited to this. Here, as shown in Figure 8 The current values ​​or displacements shown are examples only, and each The design can be varied depending on the weight of the components and the environment.

[0104] On the other hand, the lens drive motor according to the embodiment can be attached to a camera module. Such camera modules can be used with mobile phones or laptop computers, or mobile phones with cameras. In the diverse fields of multimedia such as talk, PDA, smart devices, and toys, This can be incorporated into image input devices such as surveillance cameras and video tape recorders. can.

[0105] In short, when the lens drive motor according to the embodiment is provided in the camera module, The camera module, although not shown in the diagram, includes a lens, filter, printed circuit board, and It can further include image sensors and other components.

[0106] The bobbin is then fitted with a lens unit (not shown) to assemble it into a camera module. The lens portion may be a lens barrel, and is not limited to that, and may support the lens. Either holder structure is possible and can be included. The embodiment is the lens Let's take the example of a case where the part is a lens barrel.

[0107] The lens portion is provided on the upper side of the base 350, and the filter 360, Alternatively, it is positioned in a location corresponding to the image sensor described later. Such a lens section is 1 It is equipped with more than one lens (not shown).

[0108] The bobbin 210 is coupled to the lens portion to fix the lens portion, and such The method of connecting the lens part and the bobbin 210 is as shown in the diagram, with the screw threads of the bobbin 210. A screw thread coupling method can also be used, where threads are formed on the inner circumferential surface and the outer circumferential surface 210a of the lens portion, respectively. Yes, but they can also be joined using an adhesive-free threadless method. Even with a joining method, after screw thread fastening, adhesive can be used to further secure the connection between the parts. can.

[0109] The filter 360 is installed in a through-hole formed in the center of the base 350. It can do this, and an infrared ray filter or blue light can be used. A filter is provided. The filter 360 is made of, for example, a film material or a gas It may be formed from lath material, and a flat plate such as a cover glass or cover glass for protecting the imaging surface. An infrared-blocking coating material or the like may be placed on the optical filter 360. 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, if filter 360 is located on the outside of the lens, filter 360 Without the need for a separate component, infrared radiation can be blocked by applying a coating to the lens surface. Of course, it is also possible to do so.

[0111] The aforementioned printed circuit board (not shown) has an image sensor (not shown) located in the center of its upper surface. It is equipped with various elements (not shown) for driving the camera module. Yes, they are.

[0112] The image sensor (not shown) has one or more lenses housed in the lens section (Figure (Not shown) and, in order to be positioned along the optical axis, in the center of the upper surface of the printed circuit board It can be implemented. Such an image sensor captures an object through the lens. It converts optical signals into electrical signals.

[0113] As described above, the lens drive motor and / or camera module according to the embodiment of the present invention The bobbin can implement tilting and movement in the height direction, The design becomes simpler, miniaturization is possible, product costs are reduced, and the efficiency of the applied power supply is improved. There are advantages to improving this.

[0114] Based on the above explanation, a person skilled in the art should be able to modify the invention without departing from the technical concept of the present invention. It has been found that various changes and modifications are possible, and the technical scope of the present invention is as described in the examples. This is not limited to the above, but is determined by the claims and equivalent scope. It should be done. [Explanation of Symbols]

[0115] 100 Cover Cans 200 mover 210 bobbins 211 Magnet Hole 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 circuit boards 350 base 360 Filter 400 elastic units 410 Upper spring 420 Lower spring 500 Hall sensor section

Claims

1. Base; A cover can, positioned on the base, including a top plate and side plates extending from the top plate; A bobbin placed inside the cover can; A housing positioned between the cover can and the bobbin; A magnet placed inside the cover can; A first coil, positioned inside the cover can and facing the magnet, to perform an autofocus function; A second coil positioned on the base and facing the magnet to perform image stabilization; and Includes an upper spring that connects the upper surface of the housing and the upper surface of the bobbin, The upper spring includes an inner portion that is coupled to the upper surface of the bobbin, an outer portion that is coupled to the upper surface of the housing, and a connecting portion that connects the inner portion and the outer portion. The bobbin is separated from the base in the initial position where no current is applied to the first coil. The upward movement distance of the bobbin from the initial position is greater than the downward movement distance of the bobbin from the initial position. The housing includes a stepped portion formed by recessing in the optical axis direction on the upper surface of the housing, At least a portion of the connecting portion of the upper spring is positioned on the stepped portion of the housing and overlaps with the stepped portion of the housing in the optical axis direction. The bobbin includes a rotation prevention portion formed on the outer circumferential surface of the bobbin. A camera module characterized in that the anti-rotation portion of the bobbin comes into contact with the housing when it rotates in at least one direction about the optical axis.

2. The camera module according to claim 1, characterized in that the rotation prevention portion of the bobbin includes a stopper that protrudes from the upper surface of the bobbin out from the inner portion of the upper spring.

3. The base includes a substrate, The substrate includes a main body portion positioned on the upper surface of the base, and a terminal portion that bends downward from the side of the main body portion to receive power from an external source. The camera module according to claim 1, characterized in that the second coil is arranged on the main body portion of the substrate.

4. The side surface of the main body includes a first side surface and a second side surface arranged on opposite sides of each other, and a third side surface and a fourth side surface arranged on opposite sides of each other. The terminal portion includes a first terminal portion that bends from the first side of the main body, The camera module according to claim 3, characterized in that it includes a second terminal portion that bends from the third side of the main body portion.

5. The camera module according to claim 4, characterized in that the first terminal section and the second terminal section form a 90-degree angle.

6. The camera module according to claim 3, characterized in that the base includes a terminal groove formed on the outer surface of the base to which the terminal portion is secured.

7. The camera module according to claim 3, characterized in that the substrate includes a first terminal portion electrically connected to the first coil and a second terminal portion electrically connected to the second coil.

8. The base includes a Hall sensor portion positioned at a location corresponding to the magnet, The second coil is positioned on the upper surface of the substrate. The Hall sensor section is located on the lower surface of the substrate. The camera module according to claim 3, characterized in that the base includes a Hall sensor housing groove formed on the upper surface of the base, in which the Hall sensor portion is arranged.

9. The base includes a substrate, The substrate includes a first terminal section and a second terminal section, The base includes a first terminal groove in which the first terminal portion of the substrate is disposed, and a second terminal groove in which the second terminal portion of the substrate is disposed. The camera module according to claim 1, characterized in that the first terminal groove is located on the opposite side of the second terminal groove.

10. The bobbin includes a straight portion that contacts the housing in the x-axis and y-axis directions perpendicular to the optical axis, and a rounded portion that contacts the housing in the diagonal direction between the x-axis and the y-axis, The camera module according to claim 2, characterized in that the stopper of the bobbin is positioned between the straight portion and the rounded portion.

11. The camera module according to claim 1, characterized in that, when viewed from above, the rotation prevention portion of the bobbin and the stepped portion of the housing overlap each other in the circumferential direction centered on the optical axis.

12. The bobbin is separated from the upper plate of the cover can and the bobbin in the initial position. When a unidirectional current is applied to the first coil, the bobbin moves from the initial position to the macro focus position. The camera module according to claim 1, characterized in that the bobbin moves from the initial position to an infinite focus position when a multidirectional current is applied to the first coil.

13. The upward movement distance of the bobbin is the distance from the initial position to the position where the bobbin contacts the upper plate of the cover can. The camera module according to claim 12, characterized in that the downward movement distance of the bobbin is the distance from the initial position to the position where the bobbin contacts the base.

14. The camera module according to claim 12, characterized in that the current consumed to move the bobbin from the initial position to the macro focus position is greater than the current consumed to move the bobbin from the initial position to the infinity focus position.

15. The bobbin is separated from the upper plate of the cover can at the macro focus position. The camera module according to claim 12, characterized in that the bobbin is separated from the base at the infinity focus position.

16. Printed circuit board; An image sensor arranged on the printed circuit board; and The camera module according to claim 1, characterized in that it includes a lens coupled to the bobbin.

17. base; A cover can, positioned on the base, including a top plate and side plates extending from the top plate; A bobbin placed inside the cover can; A housing positioned between the cover can and the bobbin; A magnet placed inside the cover can; A first coil, positioned inside the cover can and facing the magnet, to perform an autofocus function; A second coil positioned on the base and facing the magnet to perform image stabilization; An upper spring that connects the upper surface of the housing to the upper surface of the bobbin; and The base includes a substrate, The upper spring includes an inner portion that is coupled to the upper surface of the bobbin, an outer portion that is coupled to the upper surface of the housing, and a connecting portion that connects the inner portion and the outer portion. The bobbin is separated from the base in the initial position where no current is applied to the first coil. The upward movement distance of the bobbin from the initial position is greater than the downward movement distance of the bobbin from the initial position. The substrate includes a main body portion positioned on the upper surface of the base, and a terminal portion that bends downward from the side of the main body portion to receive power from an external source. The second coil is arranged on the main body portion of the substrate, The side surface of the main body includes a first side surface and a second side surface arranged on opposite sides of each other, and a third side surface and a fourth side surface arranged on opposite sides of each other. The camera module is characterized in that the terminal portion includes a first terminal portion that bends from the first side of the main body and a second terminal portion that bends from the third side of the main body.

18. A portable terminal device comprising a camera module according to any one of claims 1 to 17.

Images