KR20220123616A - Motor for actuating lens - Google Patents

Abstract

An embodiment of the present invention provides a lens drive motor, which comprises: a mover including a bobbin for fixing a lens unit and a magnet unit disposed on the bobbin; and a stator including a first coil unit disposed to correspond to an outer surface of the magnet uni, a second coil unit disposed to correspond to a lower surface of the magnet unit, a housing including an upper surface with an open center and a support unit disposed on an outer surface of the first coil unit, a base supporting the housing and having a through hole corresponding to the lens unit formed in the center thereof, and a substrate disposed on an upper surface of the base to apply power to the second coil unit. Accordingly, it is possible to implement the lens drive motor or a camera module having simplified internal configuration, miniaturization, and improved reliability.

Description

Lens drive motor {MOTOR FOR ACTUATING LENS}

An embodiment of the present invention relates to a lens driving motor having an improved structure.

As various types of portable terminals are widely distributed and wireless Internet services are commercialized, consumer demands related to portable terminals are also diversifying. Accordingly, various types of additional devices are being installed in portable terminals.

Among them, a camera module is a representative example that can take a photo or video of a subject, store the image data, and edit and transmit it as needed.

In recent years, the demand for compact camera modules is increasing for use in various multimedia fields such as notebook personal computers, camera phones, PDA's, smart phones, toys, etc., and for image input devices such as information terminals of surveillance cameras and video tape recorders. .

The camera module includes a lens driving motor, which can perform auto-focusing or hand shake correction, and the existing lens driving motor includes additional components for OIS (Optical Image Stabilization) configuration, so the lens The internal structure of the driving motor is relatively complicated, and the assembly movement of the lens driving motor may be complicated.

In addition, such structural complexity may limit the miniaturization of the lens driving motor, and may cause limitations in product reliability and product cost reduction.

An embodiment is to provide an OIS type lens driving motor with improved reliability in consideration of miniaturization and simplification.

Embodiments include a bobbin for fixing a lens unit, and a movable member including a magnet unit disposed on the bobbin; and a first coil portion disposed to correspond to an outer surface of the magnet portion, a second coil portion disposed to correspond to a lower surface of the magnet portion, an upper surface having an open center, and the first coil portion disposed on an outer surface A housing including a support part, a base supporting the housing and having a through hole corresponding to the lens part formed in the center thereof, and a substrate disposed on an upper side of the base to apply power to the second coil part It provides a lens driving motor comprising a stator.

Here, the magnet part may include four magnets arranged at equal intervals on the outer surface of the bobbin, and the bobbin may have a magnet groove in which the magnets are mounted on the outer peripheral surface.

Here, on one side of the substrate, a terminal part receiving power from the outside is bent downward, and a terminal groove in which the terminal part is seated may be formed on one side of the base.

Here, the substrate may be implemented as a flexible printed circuit board (FPCB).

Here, at least one fastening hole may be formed in the substrate, and a fastening protrusion corresponding to the fastening hole may be formed in the base.

Here, the substrate may have a second terminal part to which each coil of the second coil part is electrically connected, and a first terminal part to which a coil of the first coil part can be electrically connected to an upper surface thereof.

Here, the second coil unit may be provided as a fine pattern (FP) coil to which four coils are individually applied with power.

Here, an upper spring having one end and the other end fixed to the upper surface of the housing and the upper surface of the bobbin, respectively, and a lower spring having one end and the other end fixed to the lower surface of the housing and the lower surface of the bobbin, respectively. .

Here, a coupling protrusion to which the upper spring is fastened or a fusion protrusion to which the upper spring is fixed is formed on the upper surface of the housing, and the upper spring is disposed on the upper side of the housing and a coupling groove corresponding to the coupling protrusion or the fusion splicing It may include an outer portion in which a fusion groove corresponding to the protrusion is formed, an inner portion fixed to an upper surface of the bobbin, and a connection portion connecting the outer portion and the inner portion.

Here, the upper surface of the housing may be formed with a stepped portion concave in the optical axis direction from the upper surface to which the outer portion is coupled.

Here, at least two fixing pieces formed on the upper surface of the bobbin may be formed, and the inner portion may be formed with a bent portion bent outwardly so as to be in contact with the side and outer surfaces of the fixing piece.

Here, the upper spring and the lower spring are each formed of a single leaf spring, and may have the same thickness.

Here, the bobbin may have at least two anti-rotation portions protruding from an outer circumferential surface thereof, and the housing may have an inner surface formed to be spaced apart from the outer circumferential surface of the bobbin by a predetermined distance from the anti-rotation portion.

On the other hand, the embodiment is a movable member including a bobbin for fixing the lens unit, and a magnet unit disposed on the bobbin; and a first coil part and a second coil part respectively disposed to correspond to the magnet part, and a stator supporting the movable member and having a base spaced apart from a lower surface of the bobbin by a predetermined distance in the center thereof; a lens driving motor comprising a; may also provide

Here, the magnet part may include four magnets arranged at equal intervals on the outer surface of the bobbin, and the bobbin may have a magnet groove in which the magnets are mounted on the outer peripheral surface.

Here, on one side of the substrate, a terminal part receiving power from the outside is bent downward, and a terminal groove in which the terminal part is seated may be formed on one side of the base.

Here, at least one fastening hole may be formed in the substrate, and a fastening protrusion corresponding to the fastening hole may be formed in the base.

Here, the substrate may have a second terminal part to which each coil of the second coil part is electrically connected, and a first terminal part to which a coil of the first coil part can be electrically connected to an upper surface thereof.

Here, the second coil unit may be provided as a fine pattern (FP) coil to which four coils are individually applied with power.

Here, an upper spring having one end and the other end fixed to the upper surface of the housing and the upper surface of the bobbin, respectively, and a lower spring having one end and the other end fixed to the lower surface of the housing and the lower surface of the bobbin, respectively. .

Here, the upper surface of the housing may be formed with a stepped portion recessed in the optical axis direction from the upper surface to which the upper spring is coupled.

Here, the upper spring and the lower spring are each formed of a single leaf spring, and may have the same elastic force with respect to the x-axis perpendicular to the optical axis z-axis and the z-axis and the y-axis perpendicular to the x-axis.

Here, the bobbin may have at least two anti-rotation portions protruding from an outer circumferential surface thereof, and the housing may have an inner surface formed to be spaced apart from the outer circumferential surface of the bobbin by a predetermined distance from the anti-rotation portion.

According to the embodiment of the present invention, since the housing is fixed and only the bobbin is driven in all directions, it is possible to implement a lens driving motor or a camera module with improved internal configuration, miniaturization, and reliability.

1 is an exploded perspective view of a lens driving motor according to an embodiment of the present invention;
Figure 2 is a view of removing the cover can from the lens driving motor according to the embodiment of the present invention.
3 is a side cross-sectional view of a lens driving motor according to an embodiment of the present invention;
4 is a view showing a coupling state of a housing and a bobbin of a lens driving motor according to an embodiment of the present invention from an upper side.
5 is a perspective view illustrating a coupling state of a base and a second coil unit of a lens driving motor according to an embodiment of the present invention;
6 is a perspective view illustrating a coupling state between the substrate of FIG. 5 and a second coil unit;
7 is a top side view of an elastic unit according to an embodiment of the present invention.
8 is a graph schematically illustrating displacement according to a change in current applied to a first coil unit of a lens driving motor according to an embodiment of the present invention.
9 is a view showing a movement path of a lens driving motor according to an embodiment of the present invention.

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

Unless otherwise specified, all terms herein have the same general meaning as understood by those skilled in the art, and if a term used in this specification conflicts with the general meaning of the term, the definition used herein shall govern.

However, the invention to be described below is only for explaining the embodiments of the present invention, not for limiting the scope of the present invention, and the same reference numbers used throughout the specification indicate the same components.

Hereinafter, the lens driving motor of the embodiment will be described in detail with reference to the drawings.

1 is an exploded perspective view of a lens driving motor according to an embodiment of the present invention, FIG. 2 is a view with a cover can removed from the lens driving motor according to an embodiment of the present invention, and FIG. 3 is a lens driving motor according to an embodiment of the present invention 4 is a view showing the coupling state between the housing and the bobbin of the lens driving motor according to the embodiment of the present invention from the upper side, and FIG. 5 is the base and the second nose of the lens driving motor according to the embodiment of the present invention. A perspective view showing a partially coupled state, FIG. 6 is a perspective view showing a coupled state of the substrate and the second coil unit of FIG. 5, FIG. 7 is a top side view of an elastic unit according to an embodiment of the present invention, and FIG. 8 is the present invention is a graph schematically illustrating displacement according to a change in current applied to the first coil unit of the lens driving motor according to an embodiment of the present invention, and FIG. 9 is a view showing a movement path of the lens driving motor according to an embodiment of the present invention .

Referring to FIG. 1 , the lens driving motor according to the embodiment may largely include a mover 200 and a stator 300 . Also, the embodiment may further include a cover can 100 and/or an elastic unit 400 . In an embodiment, the z-axis means an optical axis direction, the x-axis means a direction perpendicular to the z-axis, and the y-axis means a direction perpendicular to the z-axis and the x-axis.

1 and 3 , the cover can 100 accommodates a movable member 200 and a stator 300 to be described later, and an opening through which a lens unit (not shown) to be described later is exposed is formed on the upper surface thereof, , the lower side may be opened and closed by the base 350 to be described later, thereby forming the exterior of the lens driving motor. The cover can 100 may be a cover. The elastic unit 400 may be an elastic member.

As shown, the cover can 100 may be formed in the shape of a rectangular parallelepiped in which an opening is formed on an upper side and a lower side is opened, but the shape of the cover can 100 may be formed in various ways. In other words, the shape of the cover can 100 may be a quadrangular shape or an octagonal shape when viewed from the top, but is not limited thereto.

The cover can 100 has an inner surface in close contact with the side and/or upper surface of the base 350, which will be described later, so that all or part of the lower surface thereof may be closed by the base 350, and the internal configuration from external impact It may have a function of preventing the penetration of external contaminants while protecting the elements.

In addition, although not shown, the cover can 100 may additionally include a fastening piece (not shown), which may be formed at the lower end of at least one surface. On the other hand, a fastening groove (not shown) into which the fastening piece is inserted is further formed on the side of the base 350 to implement a more robust sealing function and fastening function of the lens driving motor.

In addition, the cover can 100 may also perform a function of protecting the components of the lens driving motor from external interference generated by a mobile phone or the like. Therefore, the cover can 100 may be formed of a metal material, but may also be formed of various materials such as an injection molding product or an insert injection molding using a metal material.

The mover 200 may include a bobbin 210 and a magnet unit 220 .

1 to 4 , the bobbin 210 may have a magnet groove 211 in which each of the magnets is mounted is formed on the outer peripheral surface 210a, and the magnet groove 211 corresponds to the shape of the magnet. It may be formed to be, or a seating portion on which a magnet can be seated may be formed.

In addition, although not shown, an upper spring 410 and/or a lower spring (410) and/or a lower spring ( A fastening protrusion (not shown) to be fastened to the inner portions 412a and 422a of the 420 may be formed. The shape of the fastening protrusion may be circular, prismatic, or a combination thereof.

In addition, referring to FIG. 4 , the bobbin 210 may have at least one anti-rotation part 213 protruding from the outer circumferential surface 210a. is formed In the embodiment, since the AF driving and/or OIS driving is implemented only by the movement of the bobbin 210 , the rotation preventing part 213 may be formed in the bobbin 210 .

That is, when the bobbin 210 moves with respect to the x-axis and the y-axis, the outer peripheral surface 210a and the rotation preventing part 213 of the bobbin 210 and the inner peripheral surface of the housing 310 absorb the impact of the bobbin 210 together with the inner peripheral surface of the housing 310 . It is possible to limit the rotation angle of the bobbin 210 while relaxing. For example, the impact of the x and y axes is mitigated by contacting the rotation preventing part 213 and the inner surface of the housing 310, and the impact in the diagonal direction on the x and y axes is the outer peripheral surface 210a of the bobbin 210 and The inner surface of the housing 310 is in contact and is relieved, and the impact on rotation can be alleviated by contacting the inner surface of the housing 310 with the start of the anti-rotation part 213 on the outer peripheral surface 210a of the bobbin 210. will be.

In addition, referring to FIG. 4 , the shock prevention on the x-axis and/or the y-axis can use the straight part (D) of the bobbin and the housing, and the shock on the diagonal part is the round part (R) of the bobbin and the housing. It can be used, and the stopper (S) located between the straight part and the round part can be used to prevent impact on the rotation part.

In addition, at least two fixing pieces 212 may be formed on the upper or lower surface of the bobbin 210 , and the upper spring 410 or the lower spring 420 to be described later on the fixing piece 212 . Bent portions 412aa and 422aa of the inner portions 412a and 422a may be disposed. The fixing piece 212 may also be formed on the lower side of the bobbin 210, and the fixing piece 212 and the bent portions 412aa and 422aa are the bobbin 210 and the upper spring 410 or the lower spring ( 420) can easily guide the assembly, and make it possible to implement a solid fixation.

1 and 3 , the magnet unit 220 may be disposed on the bobbin 210 , and may include four magnets disposed at equal intervals on the outer surface of the bobbin 210 . Each of these magnets may be fixed to the outer surface of the bobbin 210 with an adhesive, or may be inserted or disposed in the magnet groove 211 of the bobbin 210 and fixed. In the latter case, the adhesive is applied to the magnet groove 211 ) or it can be fixed by applying it to the lower and/or side of the magnet.

In addition, the magnet unit 220 may be disposed on the outer surface of the bobbin 210 as shown, but is mounted at equal intervals on the four corners of the bobbin 210 to promote efficient use of the internal volume. can

The shape of the magnet may be a prismatic shape such as a triangular prism shape, a quadrangular prism shape, or a trapezoidal prism shape, and may include some curves in the prismatic shape. In addition, the magnet may be processed so that the edge has a part curved surface during processing.

In an embodiment, each of the magnets may be a magnet having an N pole and an S pole magnetized in a horizontal direction. The bobbin 210 can be moved by interacting with Ming's left hand rule. Specifically, the magnet may be magnetized to the N pole in the direction of the bobbin 210 and the S pole in the direction of the first coil unit 320 , and vice versa. In this case, the first coil unit 320 receives power to move the bobbin 210 fixed to the magnet in the z-axis direction, and the second coil unit 330 receives power and is fixed to the magnet. The finished bobbin 210 may be moved along the x-axis and/or the y-axis.

The stator 300 may include a first coil unit 320 , a second coil unit 330 , a housing 310 , and a base 350 .

1 to 3 , the first coil unit 320 and the second coil unit 330 are respectively disposed to correspond to the magnet unit 220 .

Specifically, the first coil unit 320 is disposed to face the outer surface of the magnet unit 220 , and may be directly wound on the housing 310 to be described later or a coil wound in advance may be mounted thereon. The first coil unit 320 may be an auto-focusing (AF) coil unit, which receives current from a substrate 340 to be described later and interacts with the magnet unit 220 disposed on the bobbin 210 to interact with the bobbin. 210 may be moved in the optical axis direction.

The first coil part 320 may be disposed on the outer surface of the support part 312 of the housing 310 to be described later, and be guided and fixed by a guide rib 312b formed at the lower end of the support part 312 . can The first coil unit 320 may be wound on the support unit 312 , and a pre-wound first coil unit 320 may be mounted on the support unit 312 .

Alternatively, four individual first coils may be arranged at intervals of 90° on the outer surface of the housing 310 . One end and the other end of the wound coil of the first coil unit 320 may be electrically connected to a first terminal unit 344 on a substrate 340 to be described later to receive power. The electrical connection method between the first coil unit 320 and the first terminal unit 344 may be any method using a conductive material, and may be an adhesive such as epoxy or soldering.

1 and 4 to 6 , the second coil unit 330 may be disposed on a substrate 340 to be described later to correspond to the lower surface of the magnet unit 220 . The second coil unit 330 may be an optical image stabilization (OIS) coil disposed on a substrate. In addition, the second coil unit 330 may be separately provided on each side of the substrate 340 , and in this case, may be four second coils individually supplied with power. Also, the second coil unit 330 may be formed of a fine pattern (FP) coil. In addition, one end and the other end of the second coil may be electrically connected to a second terminal unit 343 formed on a substrate 340 to be described later to receive power. The electrical connection method may be any method using a conductive material, and may be an adhesive such as epoxy or soldering.

1 to 4 , the housing 310 has an upper side surface 311 with an open center, and is formed at a corner of the upper side surface 311 so that the first coil unit 320 is disposed on the outer surface. It may include a support 312 that can be.

Specifically, on the upper surface 311 of the housing 310, a coupling protrusion 311a to which the upper spring 410 is fastened and/or a fusion protrusion 311b to which the upper spring 410 is fixed may be formed. have. The coupling protrusion 311a can easily guide the arrangement of the outer part 411a when the upper spring 410 to be described later is disposed. In addition, the coupling protrusion 311a can secure a space for moving the bobbin in the optical axis direction, that is, it can secure a space for the bobbin to move in a direction away from the base to be described later, and, The upper surface of the coupling protrusion 311a may be in contact with the inner surface of the cover can 100 .

The fusion protrusion 311b is fastened with a fusion groove or fusion hole of the upper spring 410 to be described later, and is fused by applying heat to firmly arrange the upper spring 410 . Although these coupling protrusions 311a and/or fusion protrusions 311b are shown together on the upper side surface 311, only one of them may be formed on the upper side surface 311 of the housing 310, in this case, the upper spring and It is also possible to secure a space for the upper spring to move in the upper direction while fixing the housing. In addition, it may be formed on the lower surface of the housing 310 to be fastened in the same manner as the lower spring 420 to be described later.

In addition, a stepped portion 311c recessed in the optical axis direction from the upper surface 311 to which the outer portion 411a is coupled may be formed on the upper surface 311 of the housing 310 . 2 and 4, the stepped portion 311c of the housing 310 is positioned at a position corresponding to the connection portion 413a of the upper spring 410 in the optical axis direction from the upper surface 311 of the housing 310. It can be formed by being depressed. In this case, the upper surface 311 may be an upper surface. The stepped portion 311c has a structural shape in consideration of the inner portion 412a and the connection portion 413a of the upper spring 410 that move together when the bobbin 210 moves in the -Z direction, which is a downward direction from the optical axis. That is, the step portion 311c may be formed so that the connection portion 413a of the upper spring 410 does not interfere with the upper surface 311 of the housing 310 when the bobbin 210 moves downward in the optical axis direction. have. The downward direction may be a direction in which the bobbin approaches a base, which will be described later. In addition, the recessed portion 353 of the base 350 for a similar function will be described later.

In addition, the inner surface of the housing 310 may be formed in a shape corresponding to the outer surface of the bobbin 210, and the inner surface of the housing may be formed to be spaced apart from the outer surface of the bobbin by a predetermined distance. have. That is, the inner surface of the first coil unit 320 fixed to the housing 310 is spaced apart from the outer surface of the magnet unit fixed to the bobbin by a predetermined distance. In addition, the inner surface of the housing 310 may be formed to correspond to the shape of the outer peripheral surface 210a and the rotation preventing part 213 of the bobbin 210, and such a structural shape is the bobbin 210 including the rotation direction. It can have an advantage in the anti-impact mitigation in all directions.

In addition, the support part 312 of the housing 310 is formed at the lower edge of the upper surface 311, respectively, and may be integrally formed by injection molding or the like. Here, the support part 312 may have a corresponding surface 312a spaced apart from the fixing protrusion 351 of the base 350 to be described later by a predetermined distance. In this case, the first coil part 320 may be disposed on the support part and may have an octagonal shape, or a portion disposed on the corresponding surface may have a curved shape and disposed on the support parts on both sides of the housing. The portion to be formed may have a shape having a linear shape.

In addition, a guide rib 312b for supporting the first coil part 320 is formed at the lower end of the support part 312 of the housing 310 to securely fix the winding or mounting of the first coil. .

Since the housing 310 is fixed even when the OIS is driven, it may be implemented as an integral or a single component with the cover can 100 . That is, the space between the cover can 100 and the housing 310 is unnecessary, so that the volume of the product can be significantly reduced.

1, 5 and 6, the substrate 340 is disposed on the upper side of the base 350 to be described later to apply power to the second coil unit 330, the first coil Power may also be applied to the part 320 . Specifically, on one side of the substrate 340, a terminal part 341 receiving power from the outside is bent downward, and receiving power from another power board 340 or from the outside, the second coil part ( 330 ) and/or power may be applied to the first coil unit 320 . The substrate 340 may be implemented as a flexible printed circuit board (FPCB) having an open center corresponding to the lens unit and the z-axis.

In addition, at least one fastening hole 342 or fastening groove is formed in the substrate 340 to be easily fixed to the base 350 to be described later, and the base 350 to be described later is provided with the fastening hole 342 or fastening groove. A fastening protrusion 352 corresponding to the groove may be formed. The shape of the fastening hole or the fastening groove and the fastening protrusion may be circular or prismatic, and if prismatic, may have a quadrangular shape, and the number may have at least two or more, and the position may be disposed at a corner.

In addition, the substrate 340 includes a second terminal part 343 to which respective coils of the second coil part 330 may be electrically connected, and a coil to which the coils of the first coil part 320 may be electrically connected. The first terminal part 344 may be formed on the upper surface. Either one of the second terminal part 343 or the first terminal part 344 may be formed on the upper surface of the substrate 340 , and the second terminal part 343 includes a plurality of the second terminal parts 343 to be electrically connected to each second coil. dog can be formed. That is, since the coil has one end and the other end, two soldering points may form a pair of each soldering part. In addition, when two of the four second coils are electrically connected inside the substrate, the two second coils may be paired to form a pair of two soldering points.

1 to 3 and 5 , the base 350 supports the mover 200 and may be spaced apart from the lower surface of the bobbin 210 by a predetermined distance in the center thereof. Specifically, the base 350 supports the housing 310, and a recess 353 recessed downward to be positioned spaced apart from the lower surface of the bobbin 210 by a predetermined distance is formed in the center. , a through hole corresponding to the lens part may be formed in the center of the recess part 353 . That is, the recess 353 may secure a space in which the bobbin can move in the downward direction, or if there is a space in which the bobbin can move in the downward direction without the recess according to design, the recess 353 Wealth may not be an essential component.

In addition, a terminal groove 354 in which the terminal part 341 is seated may be formed on one side of the base 350 , and this terminal groove 354 is formed in the terminal part 341 of the substrate 340 . It may be formed correspondingly according to the number. The terminal groove 354 may be the depth of the terminal groove 354 so that the terminal portion 341 of the board does not protrude outward. A terminal groove 354 may be formed. In this case, the two terminal grooves 354 may be formed on opposite sides of each other.

In addition, the base 350 may be formed with fixing protrusions 351 protruding from the upper corners, respectively, contacting the inner surface of the cover can 100 or the outer surface of the housing 310 , and these fixing protrusions 351 . makes it possible to easily guide the fastening of the cover can 100 and/or the housing 310 and to achieve a firm fixation after fastening. If the fixing protrusion is formed to be in contact with the outer surface of the housing, the first coil unit is disposed at a position spaced apart from the contact surface by a predetermined distance, so that the outer surface of the housing and the first coil unit do not interfere. .

In addition, the base 350 may have a fastening protrusion 352 corresponding to the fastening hole 342 or the fastening groove of the substrate 340 formed on the upper side thereof.

In addition, although not shown, the base 350 may have a fastening groove into which the fastening piece of the cover can 100 is inserted. The fastening groove is formed locally on the outer surface of the base 350 in a shape corresponding to the length of the fastening piece, or the base 350 so that a predetermined portion of the lower end of the cover can 100 including the fastening piece can be inserted. ) may be formed entirely on the outer surface.

In addition, the base 350 may perform a sensor holder function to protect an image sensor (not shown) to be described later, and in this case, a protrusion may be formed in a downward direction along the side surface of the base 350 . In addition, the base 350 may be provided with a seating portion for seating the filter 360 .

1 to 3 and 7, the elastic unit 400 includes an upper spring 410 and a lower spring 420, and only the bobbin 210, not the housing 310, is AF driven and/or Because it moves when the OIS is driven, the side spring may not be provided.

The upper spring 410 and the lower spring 420 may be formed of separate springs disposed on each side of the housing 310, but for the efficiency of production, a single sheet material is bent and cut. It may be formed of a spring.

Accordingly, one end and the other end of the upper spring 410 are fixed to the upper surface 311 of the housing 310 and the upper surface of the bobbin 210, respectively, and the lower spring 420 is the housing 310. One end and the other end may be fixed to the lower side and the lower side of the bobbin 210 , respectively.

Here, the upper spring 410 is disposed on the upper surface 311 of the housing 310, and a coupling groove 411aa corresponding to the coupling protrusion 311a and/or a fusion groove corresponding to the fusion protrusion 311b. It may include an outer portion 411a in which 411bb is formed, an inner portion 412a fixed to the upper surface of the bobbin 210, and a connection portion 413a connecting the outer portion 411a and the inner portion 412a. have. The inner portion 412a has a substantially circular shape to correspond to the shape of the upper surface of the bobbin 210 , and the outer portion 411a has a substantially rectangular shape to be supported by the shape of the housing 310 .

That is, the upper spring 410 is fastened to the upper surface of the housing 310 and the upper surface of the bobbin 210 to support the bobbin 210, and the step portion 311c of the housing 310 and the base ( Due to the structural shape of the recess 353 of the 350 , the bobbin 210 provides a restoring force when moving upward as well as moving downwards based on the z-axis of the bobbin 210 . In addition, the connection portion 413a of the upper spring 410 may be bent to have the same elastic force with respect to the x-axis and/or the y-axis, which is due to the omnidirectional driving of the bobbin 210 without the need for a side spring. . Here, the forward direction of the bobbin may mean a vertical direction (z-axis direction) and/or a horizontal direction (x-axis horizontal direction and/or y-axis vertical direction). In addition, each of the upper spring 410 and the lower spring 420 may be formed of a single leaf spring and may have the same thickness.

In addition, since the first coil unit 320 has a structure that can be directly soldered to the substrate 340 , the upper spring 410 or the lower spring 420 is in electrical communication with the first coil unit 320 . Since it does not need to be, it can be implemented as a single plate spring, so there are advantages such as simplification of assembly, strengthening of durability, and reduction of product cost. Accordingly, the lower spring 420 may be formed in the same manner as the upper spring 410 . Alternatively, the first coil may be electrically connected to an outer portion of the lower spring, and an outer portion of the lower spring may be electrically connected to the substrate.

That is, the lower spring 420 is disposed on the lower surface of the housing 310 and has a coupling groove 421a corresponding to the coupling protrusion 311a and/or a fusion groove 421bb corresponding to the fusion protrusion 311b. ) may include an outer portion 421a formed, an inner portion 422a fixed to the upper surface of the bobbin 210 , and a connection portion 423a connecting the outer portion 421a and the inner portion 422a. The inner portion 422a may have a substantially circular shape to correspond to the shape of the lower surface of the bobbin 210 , and the outer portion 421a may have a substantially rectangular shape to be supported by the shape of the housing 310 .

In addition, the lower spring 420 is fastened to the lower surface of the housing 310 and the lower surface of the bobbin 210 to support the bobbin 210, and the step portion 311c of the housing 310 and the housing ( Due to the structural shape of the recessed portion 353 of the 310 , it is possible to provide a restoring force when the bobbin 210 moves downwardly as well as upwardly based on the z-axis of the bobbin 210 . In addition, the connection portion 423a of the lower spring 420 may be bent to have the same elastic force with respect to the x-axis and/or the y-axis, which is due to the omnidirectional driving of the bobbin 210 without the need for a side spring. . Here, the forward direction of the bobbin may mean a vertical direction (z-axis direction) and/or a horizontal direction (x-axis horizontal direction and/or y-axis vertical direction).

On the other hand, the adhesive described in the embodiment may be implemented as a thermosetting epoxy or UV epoxy, it is cured by exposure to heat or UV. However, if a thermosetting epoxy is used, it is cured by moving it to an oven or by applying direct heat, and when using a UV (ultraviolet) epoxy, it is a method of curing by applying UV (ultraviolet light) to the adhesive.

In addition, the adhesive may be an epoxy in which thermal curing and UV (ultraviolet) curing can be mixed, and both thermal curing and UV (ultraviolet) curing are possible, so it may be an epoxy that can be cured by selecting any one of them, and UV After curing, it may be an epoxy that can be secondary cured with heat. The adhesive is not limited to the epoxy, and any material that can be adhered to may be substituted.

In the lens driving motor according to the embodiment of the present invention including such a configuration, only the bobbin 210 to which the lens unit is fixed may be driven and moved in all directions of the x, y, and z axes.

Referring to FIG. 3 , the bobbin 210 of the embodiment may be moved in the horizontal direction as well as upward and downward movements in the z-axis direction. That is, in the embodiment of the present invention, since the bobbin 210 can be moved vertically and/or horizontally from the reference position, the lower end of the bobbin 210 can be disposed to be spaced apart from the base 350 by a predetermined distance. Also, the base 350 may have a recess 353 to secure a separation distance.

Specifically, in the movement of the bobbin 210 in the embodiment, when a driving signal is individually applied to each second coil, a predetermined portion on the lower end side of the bobbin 210 rises, and a portion opposite to the optical axis descends. Therefore, a spatial margin below the reference position is required. Accordingly, a movable space in the vertical and/or horizontal direction of the bobbin is provided between the lower end of the bobbin 210 and the base 350 .

The control of the movement of the bobbin in the horizontal direction is as follows.

Table 1 shows a table when each of the four second coils is independently driven. Here, Coil 1 and Coil 3 described in Table 1 below are second coils disposed to face each other on the x-axis, and Coil 2 and Coil 4 are second coils disposed to face each other on the y-axis.

Coil 4 Coil 3 Coil 2 Coil 1 Output 0 0 0 0 O degree 0 0 0 One +X 0 0 One 0 +Y 0 0 One One +X, +Y 0 One 0 0 -X 0 One 0 One O degree(+X, -X) 0 One One 0 -X, +Y 0 One One One +X, -X, +Y One 0 0 0 -Y One 0 0 One +X, -Y One 0 One 0 O degree(+Y, -Y) One 0 One One +X, +Y, -Y One One 0 0 -X, -Y One One 0 One +X, -X, -Y One One One 0 -X, +Y, -Y One One One One O degree(+X, -X, +Y, -Y)

Variables indicated by 0 and 1 in Table 1 are indicated as on and off of the applied control signal, but more precisely, it can be understood as the difference in the input voltage of the applied control signal, and to control the degree of the horizontal movement distance In order to do this, the strength of the control signal may be set in various ways. Referring to FIG. 9, as shown in Table 1, by individually controlling the voltage applied to the second coil, movement for the shake correction in the horizontal direction can be controlled. be able to In addition, horizontal movement and vertical movement can be controlled simultaneously. For example, if the output of the moving unit in the table above is -Y, +X, -X, it moves at any position in the -Y axis direction and moves independently may rise or fall by applying power to the first coil. That is, when a current is applied to the first coil in a forward direction, the bobbin moves in an upward direction, and when a current direction is applied to the first coil in a reverse direction, the bobbin moves in a downward direction. The moving position of the bobbin is changed according to the amount of current of the first coil. In addition, if the output of the moving unit is +X , +Y, in the table above, it may be horizontally moved in the diagonal direction as shown in FIG. 9 .

In an embodiment, in order to simultaneously drive the AF and drive the OIS, it may be possible to adjust the application level of power to each coil.

Meanwhile, the coils of the second coil unit 330 may be controlled as a pair, which is shown in Table 2 below.

Coil 1 + 3 Coil 2 + 4 Output 0 0 0 degree 0 + +Y 0 - -Y + 0 +X - 0 -X + + +X, +Y - + -X, +Y - - -X, -Y + - +X, -Y

The description of Table 2 is the same as that of Table 1, and as shown in Table 2, if two opposing coils are controlled as a pair, the driving power can be further increased. The moving distance in the vertical and/or horizontal direction is the separation distance of X1 and X2 (distance between the bobbin 210 and the housing 310) and/or the separation distance of Z1 (bobbin 210 and the cover) shown in FIG. The distance between the top plate of the can 100) and the separation distance of Z2 (the distance between the bobbin 210 and the base 350) are limited, and the separation distance can be implemented to have a horizontal movement distance of about 50um to 200um, In addition, the separation distance can be implemented to have a vertical movement distance of about 50 μm to 400 μm. As shown in FIG. 3 , the maximum movement distance Z2 in the downward direction of the bobbin 210 is the upper direction of the bobbin 210 . It may be shorter than the maximum moving distance Z1 to In this case, the maximum moving distance Z1 in the upward direction of the bobbin 210 may be the first stroke length of the bobbin 210 , and the maximum moving distance Z2 in the downward direction of the bobbin 210 is the bobbin 210 . ) of the second stroke length. The first stroke length of the bobbin 210 may be a distance from the initial position until the bobbin 210 comes into contact with the upper plate of the cover can 100 . The second stroke length of the bobbin 210 may be a distance from the initial position until the bobbin 210 contacts the base 350 .

In addition, in the embodiment, as described above, by forming the recess 353 in the housing 310, it is possible to secure a movement space in the vertical and/or horizontal direction when the OIS is driven.

Specifically, referring to FIG. 3 , the embodiment may not only move in the Z1 direction, which is the upper direction, but also the Z2 direction, which is the lower direction, based on the z-axis when the AF is driven. Referring to FIG. 8 , an embodiment for bidirectional AF driving can be identified. In this embodiment, in a normal state in which power is not applied to the first coil unit 320, the consumption value of current and/or voltage is minimized in the vicinity of 50 cm to 1 m, which is the distance at which the user most photograph the subject. can be designed It may be desirable for the efficient use of power to be designed so that the moving distance Z1 of the bobbin 210 in the upper direction is greater than the moving distance Z2 of the bobbin 210 in the lower direction, but is not limited thereto. Here, the current value or displacement shown in FIG. 8 is only an example, and may be designed differently according to the weight and environment of each component. As shown in FIG. 8 , when the bobbin 210 moves 60um downward and is disposed at an infinite focus position, the bobbin 210 may be spaced apart from the base 350 to have a distance of 40um. As shown in FIG. 8 , the first stroke length, which is the maximum moving distance Z1 of the bobbin 210 in the upward direction, is longer than the distance until the bobbin 210 moves from the initial position to the macro focus position. can 8 , the distance from the initial position of the bobbin 210 to the infinite focus position may be shorter than the distance from the initial position of the bobbin 210 to the macro focus position. As shown in FIG. 8 , the amount of current consumed to move the bobbin 210 from the initial position to the infinity focus position may be less than the amount of current consumed to move the bobbin 210 to the macro focus position. Also, the distance from the initial position to the infinity focus position may be shorter than the distance from the initial position to the macro focus position.

On the other hand, the lens driving motor according to the embodiment may be mounted on a camera module, and such a camera module is a mobile phone or a notebook personal computer, a camera phone, PDA, smart, various multimedia fields such as toys, and furthermore, a surveillance camera. It may be provided in an image input device such as an information terminal of a video tape recorder.

In other words, when the lens driving motor according to the embodiment is provided in the camera module, the camera module is not shown, but may further include a lens unit, a printed circuit board, an image sensor, and the like.

A lens unit (not shown) may be coupled to the bobbin to be assembled into a camera module, and the lens unit may be a lens barrel, but is not limited thereto, and any holder structure capable of supporting a lens may be included. In the embodiment, a case in which the lens unit is a lens barrel will be described as an example.

The lens unit is installed on the upper side of the base 350 and is disposed at a position corresponding to the filter 360 or an image sensor to be described later. One or more lenses (not shown) are provided in the lens unit.

The bobbin 210 is coupled to the lens unit to fix the lens unit, and in the coupling method of the lens unit and the bobbin 210, a screw thread is applied to the inner circumferential surface of the bobbin 210 and the outer circumferential surface 210a of the lens unit as shown. It is also possible to use a threaded coupling method to form each, but may be coupled by a non-threaded method using an adhesive. Of course, even in the screw thread coupling method, it is possible to achieve a more robust mounting between each other by using an adhesive after the screw thread fastening.

The filter 360 may be mounted in a through hole formed in the center of the base 350, and an infrared filter or a blue filter may be provided. In addition, the filter 360 may be formed of, for example, a film material or a glass material, and an infrared blocking coating material may be disposed on the optical filter 360 of a flat plate shape such as a cover glass for protecting an imaging surface or a cover glass. have. In addition, a separate sensor holder may be positioned under the base 350 in addition to the base 350 .

On the other hand, in the case where the filter 360 is installed on the outside of the lens, of course, it is possible to block infrared rays by coating the lens surface without separately configuring the filter 360 .

The printed circuit board (not shown) has an image sensor (not shown) mounted on the center of the upper side, and various elements (not shown) for driving the camera module may be mounted.

The image sensor (not shown) may be mounted on the central portion of the upper surface of the printed circuit board so as to be positioned along the optical axis direction with one or more lenses (not shown) accommodated in the lens unit. Such an image sensor converts an optical signal of an object incident through a lens into an electrical signal.

As described above, since the lens driving motor and/or camera module according to the embodiment of the present invention can implement movement of the bobbin in the vertical and/or horizontal direction, the structure is simplified, miniaturization is possible, and product cost is achieved. is reduced, and the efficiency of the applied power can be improved.

Above, those skilled in the art from the above description will know that various changes and modifications are possible without departing from the technical spirit of the present invention, the technical scope of the present invention is not limited to the contents described in the embodiments, but claims It should be determined by the scope and its equivalent scope.

100: cover can 200: mover
210: bobbin 211: magnet hole
212: fixed piece 220: magnet unit
300: stator 310: housing
311: upper side 312: support
320: first coil unit 330: second coil unit
340: substrate 350: base
360: filter 400: elastic unit
410: upper spring 420: lower spring

Claims (20)

a cover including an upper plate and a side plate extending from the upper plate;
a bobbin disposed within the cover;
a base disposed under the bobbin and coupled to the side plate of the cover;
a magnet and a first coil disposed in the cover and configured to move the bobbin in an optical axis direction; and
and a second coil disposed on the base and facing the magnet,
The bobbin is spaced apart from the upper plate and the base of the cover at an initial position where no current is applied to the first coil,
When a one-way driving current is supplied to the first coil from the initial position, the bobbin moves to a macro focus position in an upward direction approaching the top plate of the cover, and when a driving current in the other direction is supplied to the first coil moving to an infinite focus position in a downward direction approaching the base,
The amount of current consumed to move the bobbin from the initial position to the infinity focus position is less than the amount of current consumed to move the bobbin to the macro focus position;
a substrate disposed on the base;
The substrate is bent and includes a terminal unit receiving power from the outside,
The base is formed on an outer surface of the base and includes a groove in which at least a portion of the terminal part is disposed. According to claim 1,
The bobbin is spaced apart from the upper plate of the cover at the macro focus position,
The bobbin is a lens driving motor spaced apart from the base at the infinity focus position. According to claim 1,
The bobbin moves in the first stroke length in the upward direction and moves in the second stroke length in the downward direction,
The length of the second stroke of the bobbin is shorter than the length of the first stroke of the bobbin. 4. The method of claim 3,
The length of the first stroke of the bobbin is a distance from the initial position until the bobbin contacts the upper plate of the cover,
The length of the second stroke of the bobbin is a distance from the initial position until the bobbin contacts the base. 4. The method of claim 3,
The length of the first stroke of the bobbin is longer than a distance until the bobbin moves from the initial position to the macro focus position. According to claim 1,
the second coil is disposed on the substrate;
The substrate includes a first terminal portion electrically connected to the first coil and a second terminal portion electrically connected to the second coil;
The first terminal part and the second terminal part are disposed on the upper surface of the substrate. 7. The method of claim 6,
The base includes a fastening protrusion formed in a corner area of the upper surface of the base,
The substrate includes a fastening hole coupled to the fastening protrusion,
The substrate includes a first corner area, a second corner area disposed diagonally opposite to the first corner area, a third corner area, and a fourth corner area disposed diagonally opposite the third corner area. including,
The fastening hole of the substrate is disposed in each of the first corner region and the second corner region of the substrate,
The first terminal portion is a lens driving motor disposed in each of the third corner region and the fourth corner region of the substrate. 7. The method of claim 6,
The magnet includes four magnets,
and the second coil includes four second coils corresponding to the four magnets. 7. The method of claim 6,
The board includes a flexible printed circuit board (FPCB),
The second coil is a lens driving motor formed as a FP (Fine Pattern) coil on the substrate. According to claim 1,
a housing disposed between the cover and the bobbin; and
and an elastic member connecting the bobbin and the housing. 11. The method of claim 10,
The magnet is disposed on the bobbin,
The first coil is disposed in the housing,
The elastic member includes an upper spring connecting the bobbin and the housing, and a lower spring connecting the bobbin and the housing and disposed below the upper spring,
wherein the bobbin is formed on an outer surface of the bobbin and includes a magnet groove in which the magnet is disposed. 11. The method of claim 10,
The elastic member includes an upper spring connecting the bobbin and the housing, and a lower spring connecting the bobbin and the housing and disposed below the upper spring,
The upper spring includes an inner portion coupled to the bobbin, an outer portion disposed on the upper surface of the housing, and a connection portion connecting the inner portion and the outer portion,
The housing includes a groove formed in a position corresponding to the connection portion of the upper spring on the upper surface of the housing,
A lens driving motor in which a step portion is formed by the upper surface of the housing and the groove. 12. The method of claim 11,
The bobbin includes a rotation preventing portion formed on the outer surface of the bobbin,
The rotation preventing portion of the bobbin is a lens driving motor disposed to be caught on the housing when the bobbin rotates. printed circuit board;
an image sensor disposed on the printed circuit board;
The lens driving motor of claim 1 disposed on the printed circuit board; and
and a lens coupled to the bobbin of the lens driving motor and disposed at a position corresponding to the image sensor. A mobile terminal comprising the camera module of claim 14 . a cover including an upper plate and a side plate extending from the upper plate;
a bobbin disposed within the cover;
a base disposed under the bobbin and coupled to the side plate of the cover;
a magnet and a first coil disposed in the cover and configured to move the bobbin in an optical axis direction; and
and a second coil disposed on the base and facing the magnet,
The bobbin is spaced apart from the upper plate and the base of the cover at an initial position where no current is applied to the first coil;
When a one-way driving current is supplied to the first coil from the initial position, the bobbin moves to a macro focus position in an upward direction approaching the top plate of the cover, and when a driving current in the other direction is supplied to the first coil moving to an infinite focus position in a downward direction approaching the base,
The distance from the initial position to the infinity focus position is shorter than the distance from the initial position to the macro focus position,
a substrate disposed on the base;
The substrate is bent and includes a terminal unit receiving power from the outside,
The base is formed on an outer surface of the base and includes a groove in which at least a portion of the terminal part is disposed. 17. The method of claim 16,
the second coil is disposed on the substrate;
The substrate includes a first terminal portion electrically connected to the first coil and a second terminal portion electrically connected to the second coil;
The first terminal part and the second terminal part are disposed on the upper surface of the substrate. 18. The method of claim 17,
The base includes a fastening protrusion formed in a corner area of the upper surface of the base,
The substrate includes a fastening hole coupled to the fastening protrusion,
The substrate includes a first corner area, a second corner area disposed diagonally opposite to the first corner area, a third corner area, and a fourth corner area disposed diagonally opposite the third corner area. including,
The fastening hole of the substrate is disposed in each of the first corner region and the second corner region of the substrate,
The first terminal portion is a lens driving motor disposed in each of the third corner region and the fourth corner region of the substrate. 17. The method of claim 16,
The bobbin is spaced apart from the upper plate of the cover at the macro focus position,
The bobbin is a lens driving motor spaced apart from the base at the infinity focus position. a cover including an upper plate and a side plate extending from the upper plate;
a bobbin disposed within the cover;
a base disposed under the bobbin and coupled to the side plate of the cover;
a magnet and a first coil disposed in the cover and configured to move the bobbin in an optical axis direction; and
and a second coil disposed on the base and facing the magnet.

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