KR102458713B1 - Lens driving unit and camera module including the same - Google Patents

Abstract

An embodiment includes a base, a housing disposed on the base, a bobbin disposed in the housing, a magnet disposed in the housing, a first coil disposed on the bobbin opposite to the magnet and moving the bobbin in the optical axis direction by interaction with the magnet; and an upper elastic member coupled to the bobbin and the housing, a circuit board disposed on the base, a support member supporting the housing and electrically connecting the upper elastic member and the circuit board, and a portion of the support member and the lower portion of the outer surface of the housing and a damping portion disposed and engaged with a portion of the support member and a lower portion of the outer surface of the housing.

Description

Lens driving unit and camera module including the same}

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

The content described in this section merely provides background information for the embodiment and does not constitute the prior art.

In recent years, the development of IT products such as a mobile phone, a smart phone, a tablet PC, and a notebook equipped with a miniature digital camera has been actively carried out.

In the case of a camera module mounted on a small electronic product such as a smartphone, the camera module may frequently be impacted during use, and the camera module may be slightly shaken according to a user's hand shake while shooting. In consideration of such a point, the development of a technology for additionally installing a hand-shake correction means in a camera module is recently required.

In order to further improve such an image stabilization means, structural improvement of a lens driving device that aligns the optical axis focal length of the lens in the camera module or performs the image stabilization function is required.

In particular, if tilt occurs when the lens driving device performs camera shake correction, it becomes an obstacle to auto-focusing and camera shake correction of the lens driving device, and the quality of a captured image may be deteriorated, so improvement is required.

Accordingly, the embodiment relates to a lens driving device having a structure capable of suppressing occurrence of excessive tilt of some parts when performing handshake correction, and a camera module including the same.

The technical task to be achieved by the embodiment is not limited to the technical task mentioned above, and other technical tasks not mentioned will be clearly understood by those of ordinary skill in the art to which the embodiment belongs from the description below.

A lens driving device according to an embodiment includes a base; a housing disposed on the base; a bobbin disposed within the housing; a magnet disposed on the housing; a first coil disposed on the bobbin to face the magnet and moving the bobbin in an optical axis direction by interaction with the magnet; and an upper elastic member coupled to the bobbin and the housing; a circuit board disposed on the base; a support member supporting the housing and electrically connecting the upper elastic member and the circuit board; and a damping part disposed between a portion of the support member and a lower portion of the outer surface of the housing, and coupled to the portion of the support member and the lower portion of the outer surface of the housing.

The damping part may be disposed at a corner portion of the housing. The damping part may be an epoxy, a thermosetting adhesive, or a photocurable adhesive. The part of the support member coupled to the damping part may be positioned below the upper elastic member.

The support member and the upper elastic member may be electrically connected to each other by a conductive adhesive. The support member may include a coupling portion coupled to the base. The damping part may be positioned higher than the coupling part of the support member. The support member may be in the form of a wire.

The lens driving device may include a second coil disposed to face the magnet and moving the housing by interaction with the magnet. The second coil may include a circuit member disposed on the circuit board and a coil formed on the circuit member. The second coil may be electrically connected to the circuit board.

The circuit board may include an upper surface disposed on the upper surface of the base, a terminal surface bent from the upper surface of the circuit board, and terminals formed on the terminal surface.

The bobbin may include an upper support protrusion formed on an upper surface of the bobbin and a lower support protrusion formed on a lower surface of the bobbin, and the upper elastic member may include a through hole coupled to the upper support protrusion.

A current may be applied to the first coil through the upper elastic member and the supporting member. The lens driving device may include a lower elastic member disposed under the bobbin and coupled to the bobbin and the housing. The portion of the support member coupled to the damping part may be positioned higher than the lower elastic member.

A lens driving device according to another embodiment includes a base; a housing disposed on the base; a bobbin disposed within the housing; a magnet disposed on the housing; a first coil disposed on the bobbin to face the magnet and moving the bobbin in an optical axis direction by interaction with the magnet; and an upper elastic member coupled to the bobbin and the housing; a circuit board disposed on the base; a support member coupled to the upper elastic member by a conductive adhesive; and a part of the support member and a damping part coupled to the housing, wherein the part of the support member coupled to the damping part is disposed closer to the lower surface of the housing than the upper surface of the housing. The lens driving apparatus according to another embodiment may include a second coil disposed on the circuit board to face the magnet and moving the housing by interaction with the magnet.

A lens driving device according to another embodiment includes a base; a housing disposed on the base; a bobbin disposed within the housing; a magnet disposed on the housing; a first coil disposed on the bobbin to face the magnet and moving the bobbin in an optical axis direction by interaction with the magnet; and an upper elastic member coupled to the bobbin and the housing; a circuit board disposed on the base; a support member supporting the housing and electrically connecting the upper elastic member and the circuit board; and a damping part disposed between the support member and the housing.

A camera module according to an embodiment includes a lens barrel; A lens driving device according to any one of the embodiments; and an image sensor.

In an embodiment, the support member may suppress tilt of the housing and the bobbin by having a first fixing part fixed to a lower side of the housing.

In addition, by reducing the length of the central axis of the support member in the first direction by the first fixing part, it is possible to suppress the tilt of the housing and the bobbin.

In addition, there is an effect of improving the tilt defect when the lens driving device performs hand shake correction, and consequently reducing product defects.

In addition, in the embodiment, by using a plate-shaped support member having a structure in which the spring constant can be adjusted, the tilt defect is improved and the distance between each fixed point of the support member is shortened and the spring constant is strengthened by appropriately adjusting the lens. There is an effect that can smoothly perform the image stabilization of the driving device.

1 is a perspective view illustrating a lens driving device according to an exemplary embodiment.
2 is an exploded perspective view illustrating a lens driving device according to an exemplary embodiment.
3 is a front view illustrating a support member according to an exemplary embodiment.
4 is a front view illustrating a part of a lens driving device to which a support member is mounted, according to an exemplary embodiment.
5 is a perspective view illustrating a part of a lens driving device to which a support member is mounted, according to an exemplary embodiment.
6 is a front view illustrating a support member according to another exemplary embodiment.
7 is a front view illustrating a part of a lens driving device to which a support member is mounted according to another exemplary embodiment.
8 is a front view illustrating a part of a lens driving device according to an exemplary embodiment.

Hereinafter, an embodiment will be described in detail with reference to the accompanying drawings. Since the embodiment may have various changes and may have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiment to the specific disclosed form, and it should be understood to include all changes, equivalents, or substitutes included in the spirit and scope of the embodiment. In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

Terms such as “first” and “second” may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. In addition, terms specifically defined in consideration of the configuration and operation of the embodiment are only for describing the embodiment, and do not limit the scope of the embodiment.

In the description of the embodiment, in the case where it is described as being formed on "up (above)" or "below (below)" (on or under) of each element, above (above) or below (on or under) ) includes both elements in which two elements are in direct contact with each other or one or more other elements are disposed between the two elements indirectly. In addition, when expressed as "up (up)" or "down (on or under)", it may include not only the upward direction but also the meaning of the downward direction based on one element.

Also, as used hereinafter, relational terms such as "upper/upper/above" and "lower/lower/below" etc. do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It may be used only to distinguish one entity or element from another.

In addition, a Cartesian coordinate system (x, y, z) may be used in the drawings. In the drawings, the x-axis and the y-axis mean axes perpendicular to the optical axis. For convenience, the optical axis direction (z-axis direction) may be referred to as a first direction, the x-axis direction may be referred to as a second direction, and the y-axis direction may be referred to as a third direction.

1 is a perspective view illustrating a lens driving device according to an exemplary embodiment. 2 is an exploded perspective view illustrating a lens driving device according to an exemplary embodiment.

An image stabilization device applied to a small camera module of a mobile device such as a smartphone or tablet PC is designed to prevent the outline of the captured image from being clearly formed due to the vibration caused by the user's hand shake when shooting still images. means the device is configured. In addition, the auto-focusing device is a device for automatically focusing the image of the subject on the image sensor (not shown) surface.

Such a hand-shake compensating device and an auto-focusing device can be configured in various ways. In the embodiment, the optical module composed of a plurality of lenses is moved in the first direction or is moved in a plane perpendicular to the first direction to achieve such hand-shake. A correction operation and/or an auto-focusing operation may be performed.

As shown in FIG. 2 , the lens driving device according to the embodiment may include a movable part. In this case, the movable unit may perform the functions of auto-focusing the lens and correcting hand shake. The movable part may include a bobbin 110 , a first coil 120 , a first magnet 130 , a housing 140 , an upper elastic member 150 , and a lower elastic member 160 .

The bobbin 110 is provided with a first coil 120 disposed inside the first magnet 130 on an outer circumferential surface, and is used for electromagnetic interaction between the first magnet 130 and the first coil 120 . Thus, it may be installed to be reciprocally movable in the first direction in the inner space of the housing 140 . A first coil 120 may be installed on the outer peripheral surface of the bobbin 110 to enable electromagnetic interaction with the first magnet 130 .

In addition, the bobbin 110 may be elastically supported by upper and lower elastic members 150 and 160 and move in the first direction to perform an auto-focusing function.

The bobbin 110 may include a lens barrel (not shown) in which at least one lens is installed. The lens barrel may be coupled to the inside of the bobbin 110 in various ways.

For example, a female thread may be formed on the inner peripheral surface of the bobbin 110 , and a male thread corresponding to the thread may be formed on the outer peripheral surface of the lens barrel, and the lens barrel may be coupled to the bobbin 110 by screwing them.

However, the present invention is not limited thereto, and the lens barrel may be directly fixed to the inside of the bobbin 110 by a method other than screw coupling without forming a screw thread on the inner circumferential surface of the bobbin 110 . Alternatively, the one or more lenses may be integrally formed with the bobbin 110 without a lens barrel.

The lens coupled to the lens barrel may be configured as one sheet, or two or more lenses may be configured to form an optical system.

The auto-focusing function is controlled according to the direction of the current, and the auto-focusing function may be implemented by moving the bobbin 110 in the first direction. For example, when a forward current is applied, the bobbin 110 may move upward from the initial position, and when a reverse current is applied, the bobbin 110 may move downward from the initial position. Alternatively, the movement distance in one direction from the initial position may be increased or decreased by adjusting the amount of current in one direction.

A plurality of upper support protrusions and lower support protrusions may protrude from the upper and lower surfaces of the bobbin 110 . The upper support protrusion may be provided in a cylindrical shape or a prismatic shape, and may couple and fix the upper elastic member 150 . The lower support protrusion may be provided in a cylindrical or prismatic shape like the upper support protrusion, and may couple and fix the lower elastic member 160 .

In this case, a through hole corresponding to the upper support protrusion may be formed in the upper elastic member 150 , and a through hole corresponding to the lower support protrusion may be formed in the lower elastic member 160 . Each of the support protrusions and the through holes may be fixedly coupled to each other by thermal fusion or an adhesive member such as epoxy.

The housing 140 has a hollow column shape supporting the first magnet 130 , and may be formed in a substantially rectangular shape. The first magnet 130 and the support member 220 may be respectively coupled to the side portion of the housing 140 to be disposed.

In addition, as described above, the bobbin 110 that is guided by the elastic members 150 and 160 and moves in the first direction may be disposed inside the housing 140 . In an embodiment, the first magnet 130 may be disposed on a corner portion of the housing 140 , and the support member 220 may be disposed on a side surface thereof.

The upper elastic member 150 and the lower elastic member 160 may elastically support the ascending and/or descending operation of the bobbin 110 in the first direction. The upper elastic member 150 and the lower elastic member 160 may be provided as leaf springs.

As shown in FIG. 2 , the upper elastic member 150 may be provided in two pieces separated from each other. Through this two-division structure, each divided portion of the upper elastic member 150 may receive currents of different polarities or different power sources. Also, as a modified embodiment, the lower elastic member 160 may have a two-part structure, and the upper elastic member 150 may have an integrated structure.

Meanwhile, the upper elastic member 150 , the lower elastic member 160 , the bobbin 110 , and the housing 140 may be assembled through thermal fusion and/or bonding using an adhesive or the like. In this case, for example, the fixing operation may be finished by bonding using an adhesive after thermal fusion fixing.

The base 210 may be disposed under the bobbin 110 and may have a substantially rectangular shape, the printed circuit board 250 may be seated, and the lower side of the support member 220 may be fixed.

In addition, the support member 220 seating groove 214 into which the lower portion of the support member 220 can be inserted may be concavely formed on the upper surface of the base 210 . An adhesive may be applied to the support member 220 seating groove 214 to fix the support member 220 so that it does not move.

A support groove having a corresponding size may be formed on a surface of the base 210 facing the portion on which the terminal surface 253 is formed of the printed circuit board 250 . The support groove is formed to be concave inward to a predetermined depth from the outer circumferential surface of the base 210 , so that the portion where the terminal surface 253 is formed does not protrude to the outside or the amount of protrusion can be adjusted.

The support member 220 is disposed on the side surface of the housing 140 , the upper side is coupled to the housing 140 , and the lower side is coupled to the base 210 , and the bobbin 110 and the housing 140 are connected to the housing 140 . It may be supported to be movable in a second direction and a third direction perpendicular to the first direction, and may be electrically connected to the first coil 120 .

Since each of the support members 220 according to the embodiment is disposed on the outer surface of the quadrangle of the housing 140 , a total of four may be installed symmetrically to each other. However, the present invention is not limited thereto, and it is also possible to consist of eight pieces, two for each straight surface.

In addition, the support member 220 may be electrically connected to the upper elastic member 150 , or may be electrically connected to a straight surface of the upper elastic member 150 .

In addition, since the support member 220 is formed as a separate member from the upper elastic member 150 , the support member 220 and the upper elastic member 150 may be electrically connected to each other through a conductive adhesive, solder, or the like. Accordingly, the upper elastic member 150 may apply a current to the first coil 120 through the electrically connected supporting member 220 .

The support member 220 of the embodiment may include a first fixing part 221 (refer to FIG. 3 ) for fixing the support member 220 to the housing at a lower side of the housing. In the lens driving device including the first fixing part 221 , tilt of the bobbin 110 and/or the housing 140 may be suppressed when hand shake correction is performed. A specific structure of the support member 220 will be described below with reference to FIG. 3 and the like.

Meanwhile, although the plate-shaped support member 220 is illustrated in FIG. 2 as an example, the present invention is not limited thereto. That is, the support member may be provided in the form of a wire.

The second coil 230 may perform handshake correction by moving the housing 140 in the second and/or third directions through electromagnetic interaction with the first magnet 130 .

Here, the second and third directions may include directions substantially close to the x-axis and y-axis directions as well as the x-axis and y-axis directions. That is, when viewed from the driving side of the embodiment, the housing 140 may move in parallel to the x-axis and the y-axis, but also, when moving while being supported by the support member 220, it may move slightly inclined to the x-axis and the y-axis. have.

In addition, the first magnet 130 needs to be installed at a position corresponding to the second coil 230 .

The second coil 230 may be disposed to face the first magnet 130 fixed to the housing 140 . In an embodiment, the second coil 230 may be disposed outside the first magnet 130 . Alternatively, the second coil 230 may be installed to be spaced apart from the lower side of the first magnet 130 by a predetermined distance.

According to an embodiment, a total of four second coils 230 may be installed at the four corners of the circuit member 231 , but the present invention is not limited thereto, and one for the second direction and one for the third direction. It is also possible that only two such lights are installed, or four or more may be installed.

In an embodiment, a circuit pattern is formed in the shape of the second coil 230 on the circuit member 231 , and an additionally separate second coil may be disposed on the circuit member 231 , but the present invention is not limited thereto. Without forming a circuit pattern in the shape of the second coil 230 on the member 231 , only a separate second coil 230 may be disposed on the circuit member 231 .

Alternatively, the second coil 230 may be formed by winding the wire in a donut shape, or the second coil 230 may be formed in the form of an FP coil and electrically connected to the printed circuit board 250 .

The second coil 230 may be disposed above the base 210 and below the housing 140 . In this case, the circuit member 231 including the second coil 230 may be installed on the upper surface of the printed circuit board 250 disposed above the base 210 .

However, the present invention is not limited thereto, and the second coil 230 may be disposed in close contact with the base 210 , may be disposed spaced apart from the base 210 , and may be formed on a separate substrate to attach the second coil 230 to the printed circuit board 250 . It can also be laminated.

The printed circuit board 250 is coupled to the upper surface of the base 210, and as shown in FIG. 2, a through hole or groove is provided at a position corresponding to the support member 220 so that the seating groove 214 can be exposed. can be formed.

A bent terminal surface 253 on which the terminal 251 is installed may be formed on the printed circuit board 250 . In the embodiment, a printed circuit board 250 on which two bent terminal surfaces 253 are formed is shown.

A plurality of terminals 251 are disposed on the terminal surface 253 to supply current to the first coil 120 and the second coil by receiving external power. The number of terminals formed on the terminal surface 253 may be increased or decreased according to the types of components that need to be controlled. In addition, the printed circuit board 250 may include one or three or more terminal surfaces 253 .

The cover member 300 may be provided in a substantially box shape, accommodate the above-described movable part, the second coil 230 , a part of the printed circuit board 250 , and the like, and may be coupled to the base 210 .

The cover member 300 protects the movable part accommodated therein, the second coil 230, the printed circuit board 250, etc. from being damaged, and in particular, the first magnet 130, the first The electromagnetic field generated by the coil 120 , the second coil 230 , and the like may be restricted from leaking to the outside so that the electromagnetic field may be focused.

3 is a front view illustrating the support member 220 according to an exemplary embodiment. 4 is a front view illustrating a part of the lens driving device to which the support member 220 is mounted, according to an exemplary embodiment. 5 is a perspective view illustrating a part of the lens driving device to which the support member 220 is mounted, according to an exemplary embodiment.

In an embodiment, the support member 220 may be provided in a plate shape, the upper side is coupled to the upper side of the housing 140 , a part is fixed to the lower side of the housing 140 , and the lower side is the base 210 . It may have a structure that binds to

Specifically, the support member 220 may include a first fixing part 221 , a first coupling part 222 , a second coupling part 223 , a first connection part 224 , and an elastically deformable part 225 . can In this case, each component of the support member 220 may be integrally formed.

The first fixing part 221 is a part of the support member 220 fixed to the lower side of the housing 140 , and when the lens driving device performs handshake correction, the bobbin 110 and the housing 140 . It can play a role in suppressing the tilt.

When compensating for hand-shake, the bobbin 110 and the housing 140 not only horizontally move in the second and third directions perpendicular to the first direction, but also perform a tilt motion that is inclined in the first direction during horizontal movement.

When the bobbin 110 and the housing 140 are tilted, it may be an obstacle to auto-focusing and hand-shake correction of the lens driving device, and the quality of a captured image may be deteriorated. Therefore, it is necessary to appropriately suppress the tilt generation.

The size of the tilt is proportional to the distance between the fixed point of the support member 220 to the base 210 and the fixed point of the housing 140 . Specifically, the tilt also increases in proportion to the magnitude of the moment applied to the bobbin 110 and the housing 140, and the moment M may be expressed as follows.

M = F × L

Here, F denotes a force applied to the bobbin 110 and the housing 140, for example, a force applied by an electromagnetic field, and L denotes a point fixed to the base 210 in the support member 220 and the housing (140) means the distance between the fixed points.

Accordingly, as the distance L increases, the moment applied to the bobbin 110 and the housing 140 increases, and when the moment increases, the bobbin 110 and the housing 140 rotate with respect to the point fixed to the base 210 . will increase, and the tilt due to this rotation may also increase.

Therefore, as the distance L is reduced, the moment applied to the bobbin 110 and the housing 140 and the tilt may also be reduced. can be adjusted

Accordingly, the support member 220 includes the first fixing part 221 fixed to the housing 140 between the first coupling part 222 and the second coupling part 223 to reduce the distance L, and , in order to further reduce the distance L, it may be appropriate for the first fixing part 221 to be fixed to the lower side of the housing 140 .

In this case, the distance L may be the distance from the support member 220 to the point fixed to the base 210 , that is, from the second coupling part 223 to the first fixing part 221 . In addition, in order to fix the first fixing part 221 to the lower side of the housing 140 , the support member 220 may have the following structure.

The first fixing part 221 is a portion fixed to the lower side of the side of the housing 140 in the support member 220 , and may be provided at the lower end of the first connection part 224 to be described below. In this case, the first fixing part 221 is integrally coupled with the first connecting part 224 and the elastically deformable part 225 to connect the first connecting part 224 and the elastically deformable part 225 to each other. can

The first fixing part 221 may be bonded to the lower side of the housing 140 with an adhesive to be fixed to the housing 140 . As the adhesive used for bonding, various types of epoxy, thermosetting adhesives, photocurable adhesives and the like may be used.

In addition, the bonding may serve as a damping unit for buffering vibrations generated when the housing 140 and the bobbin 110 operate in the second and third directions.

Meanwhile, although not shown, a damping unit for buffering vibrations of the housing 140 and the bobbin 110 may be provided in various forms other than bonding the first fixing unit 221 to the housing 140 . For example, it is provided on a curved side of the housing 140 , that is, a corner portion, and is provided to contact the base 210 to cushion vibrations of the housing 140 and the bobbin 110 .

In addition, although not shown, if the damping part does not interfere with the operation of the support member 220, it is bonded to the housing 140 at an appropriate portion of the support member 220 so that this bonding serves as a damping part. may be

In the embodiment, a total of four support members 220 are provided, the support members 220 include one first fixing part 221 , and each support member 220 is the center of the housing 140 . may be disposed radially with respect to Accordingly, a total of four first fixing parts 221 may be provided in the lens driving apparatus of the embodiment.

The first coupling part 222 is a portion coupled to the housing 140 on the upper side of the housing 140 . As shown in FIG. 5 , a protrusion opposite to the first coupling part 222 may be formed on the upper side of the housing 140 for coupling with the first coupling part 222 .

The first coupling portion 222 and the protruding portion may be bonded by an adhesive or the like, such that the first coupling portion 222 may be fixed or coupled to the protruding portion of the housing 140 . In this case, various types of adhesives such as epoxy, thermosetting adhesive, and photocurable adhesive may be used.

Since the first coupling part 222 needs to have a surface area for bonding, it is appropriate to be formed in a plate shape having a constant width in the vertical and lateral directions, unlike the first connection part 224 or the elastically deformable part 225 . can

The second coupling portion 223 is a portion coupled to the base 210 . As shown in FIG. 4 , the second coupling part 223 is seated in the support member 220 seating groove 214 formed on the upper surface of the base 210 , and the second coupling part 223 is bonded by an adhesive or the like. The part 223 may be fixed or coupled to the base 210 . Likewise, various types of adhesives such as epoxy, thermosetting adhesive, and photocurable adhesive may be used.

On the other hand, as shown in Figure 4, the second coupling portion 223 is provided in plurality and in order to couple with the elastically deformable portion 225 that is symmetrically disposed, may be provided as a pair symmetrical to each other, each The second coupling portion 223 of the same may be fixed or coupled to the support member 220 seating groove 214 provided as a pair symmetrical to each other, respectively.

The second coupling part 223 is preferably provided in a shape corresponding to the shape of the support member 220 seating groove 214 so that it can be seated in the seating groove 214 of the support member 220 . That is, so that the second coupling part 223 is not easily separated, the support member 220 seating groove 214 may have various vertical widths, and accordingly, the shape of the second coupling part may also be changed to the support member 220 . ) may be formed to correspond to the shape of the seating groove 214 .

The first connection part 224 may be formed to extend from the first coupling part 222 . At this time, one end, that is, the lower end of the first connection part 224 may be coupled to the first fixing part 221 . The first connection part 224 may serve to connect the first coupling part 222 and the first fixing part 221 .

Therefore, the upper end of the first connection part 224 is integrally coupled with the first coupling part 222 , and the lower end of the first connection part 224 is integrally coupled with the first fixing part 221 . can be

Since the first connection part 224 connects the first coupling part 222 and the first fixing part 221 , as shown in FIGS. 3 and 4 , the lateral width is narrow and the vertical length is long in the plate shape. It may be appropriate to be provided in the shape of a bar.

* The elastically deformable part 225 may be formed to extend from the second coupling part 223 . The elastically deformable part 225 is deformed when the bobbin 110 and the housing 140 move in the second or third direction, but has a restoring force to elastically hold the bobbin 110 and the housing 140. can play a supporting role.

The elastic deformation part 225 is a direction in which the housing 140 and the bobbin 110 move when the housing 140 and the bobbin 110 move in the second and third directions perpendicular to the first direction. That is, the support member 220 may be elastically deformed in the lateral direction and in the vertical direction of the support member 220 .

Due to this structure, the housing 140 and the bobbin 110 can move in the second and third directions with almost no change in position in the first direction except for tilt, thereby increasing the accuracy of handshake correction. This uses a structure in which the elastically deformable part 225 can be elastically deformed even in the vertical direction of the support member 220 .

The elastically deformable part 225 is, as shown in FIGS. 3 and 4 , one end integrally coupled to the first fixing part 221 , and the other end integrally coupled to the second coupling part 223 . can In this case, the elastically deformable parts 225 may be provided as a pair symmetrical to each other.

In addition, the elastically deformable part 225 generally extends upwardly from the first fixing part 221 and then extends downwardly to be connected to the second coupling part 223 and has a shape bent at least once in the lateral direction. can

Due to this structure, the elastically deformable part 225 elastically supports the movement of the housing 140 and the bobbin 110 , and at the same time the first fixing part 221 is located on the lower side of the bobbin 110 . allow it to be fixed.

Also, due to this structure, the elastically deformable portion 225 may be elastically deformed in the lateral direction of the support member 220 and in the vertical direction of the support member 220 . Specifically, the elastically deformable part 225 may include a first bent part 225a, a second bent part 225b, and a second connection part 225c.

The first bent portion 225a may protrude upward from the second coupling portion 223 and include at least one bent portion. The first bent portion 225a may be easily elastically deformed in the first direction, the second direction, and the third direction because the vertical and lateral bent portions of the support member 220 are formed.

The second bent part 225b is formed to protrude upward from the first fixing part 221 , and may include at least one bent part. Like the first bent part 225a , the second bent part 225b is easily bent in the first direction, the second direction, and the third direction due to the vertical and lateral bent portions of the support member 220 being formed. It can be elastically deformed.

The number and shape of each bent portion of the first bent portion 225a and the second bent portion 225b are determined by the material of the support member 220 , the spring constant or stiffness required for the support member 220 , and lens driving. It can be appropriately selected in consideration of structural relevance to the device and the like.

The second connecting portion 225c may have a longitudinal direction disposed in the lateral direction of the support member 220, and may serve to connect the upper ends of the first bent portion 225a and the second bent portion 225b to each other. have.

Accordingly, one end of the second connection part 225c may be integrally coupled with the first bent part 225a, and the other end may be integrally coupled with the second bent part 225b.

Meanwhile, the first bent part 225a, the second bent part 225b, and the second connection part 225c may be integrally molded by, for example, injection molding. Meanwhile, as described above, the first fixing part 221 , the first coupling part 222 , the second coupling part 223 , the first connection part 224 and the elastically deformable part ( 225) is also integrally molded by a method such as injection molding, so that the support member 220 may be molded as a whole.

6 is a front view showing the support member 220 according to another embodiment. 7 is a front view illustrating a part of a lens driving device on which a support member 220 is mounted according to another exemplary embodiment.

As shown in FIGS. 6 and 7 , the support member 220 is a pair in which the first coupling part 222 , the first connection part 224 and the first fixing part 221 are symmetrical to each other, respectively. It may be formed in a provided structure.

At this time, since the second coupling part 223 is provided as a pair, the protrusion part, which is a part to which the second coupling part 223 of the housing 140 provided to be opposed thereto, is bonded is also provided in the housing 140 as described above. It may be provided as a pair that is respectively disposed at positions corresponding to the second coupling portions 223 of the pair.

In the embodiment, the support member 220 is provided with a total of four, the support member 220 includes two first fixing parts 221 , and each support member 220 is the center of the housing 140 . may be disposed radially with respect to Accordingly, a total of eight first fixing units 221 may be provided in the lens driving device of the embodiment.

In addition, the first coupling part 222 and the first connection part 224 are disposed outside the support member 220 , and a pair of the first coupling part 222 and the second connection part 225c are disposed between the pair of first coupling parts 222 and the second connection part 225c. of the elastically deformable part 225 may be disposed.

In the embodiment shown in FIGS. 6 and 7 , the first fixing part 221 is provided as a pair spaced apart from each other in the lateral direction of the support member 220 , and thus the housing 140 is provided with one fixing part. ) and the tilt generation of the bobbin 110 can be more effectively suppressed.

In addition, as described above, the bonding for fixing or coupling the first fixing part 221 and the housing 140 may serve as a damping part, and in the embodiments shown in FIGS. 6 and 7 , the bonding is the first fixing part 221 . A pair may be provided on the support member 220 in the same manner as the first fixing part 221 .

Therefore, compared to the case of providing one bonding, in the embodiments shown in FIGS. 6 and 7 , the bonding further reduces vibrations generated during the second and third directions of the housing 140 and the bobbin 110 . can be effectively filled.

8 is a front view illustrating a part of a lens driving device according to an exemplary embodiment. In an embodiment, the first magnet 130 is disposed to face a curved side, that is, a corner of the housing 140 , and the support member 220 is on a flat side, that is, a straight surface of the housing 140 . may be disposed opposite to each other.

In addition, a plurality of the first magnets 130 may be provided, and each of the first magnets 130 may be radially disposed with respect to the center of the housing 140 .

Referring to FIGS. 2 and 8 , in the embodiment, a total of four first magnets 130 may be provided, and may be provided in a trapezoidal shape to face the corners of the housing 140 .

Meanwhile, the support member 220 may be provided in plurality, and each of the support members 220 may be disposed radially with respect to the center of the housing 140 and disposed between the first magnets 130 . .

2 and 8, in the embodiment, the support member 220 is provided with a total of four, and may be formed in a plate shape as a whole. On the other hand, the specific structure of the support member 220 has been disclosed in several embodiments above, but is not limited thereto and may be provided in various shapes that can be derived from the above embodiments.

In the embodiment, since the plate-shaped support member 220 is used, the tilt of the housing 140 and the bobbin 110 can be effectively suppressed by appropriately adjusting the spring constant and reducing the distance L (see FIG. 4 ).

On the other hand, for example, when using the wire-type support member 220, it is necessary to reduce the length of the wire to reduce the distance L. In this case, if the spring constant of the support member 220 increases, it is difficult to reduce the spring constant again. can

Therefore, it may be more appropriate to use the plate-shaped support member 220 rather than the wire-type support member 220 in the lens driving device of the embodiment.

Referring to FIG. 8 , in the embodiment, the first distance h, which is the separation distance in the first direction from the upper surface of the second coil 230 to the lower end of the first fixing part 221 , is the distance of the first magnet 130 . It may be provided to be smaller than the first length (a), which is the length in the first direction.

Preferably, the first distance h may be designed to be about half of the first length a. The range in which the electromagnetic force interacting with the first magnet 130 and the second coil 230 used when the lens driving device performs handshake correction is the first direction length of the first magnet 130, that is, the first length ( a) can be greatly affected.

In addition, since the lens driving device performs auto-focusing at the same time as hand-shake correction, the housing 140 and the bobbin 110 have the first magnet 130 , the first coil 120 , and the second coil 230 to interact with each other electromagnetic force. can be operated by

Accordingly, when the first fixing part 221 is disposed adjacent to the portion where the electromagnetic force interacting with the first magnet 130 , the first coil 120 and the second coil 230 is the strongest, the electromagnetic force is applied. The lowering point and the first direction position of the first fixing part 221 somewhat coincide, compared to the case where the strongest electromagnetic force is applied to the upper or lower side of the first fixing part 221 , the housing 140 and the bobbin 110 ) to reduce the tilt size.

Accordingly, the first distance h, which is the case where the electromagnetic force interacting with the first magnet 130 , the first coil 120 , and the second coil 230 is the strongest, is approximately equal to the first length (a). It may be appropriate to arrange the first fixing part 221 to be about half.

Specifically, it may be appropriate to design the first distance h to be 0.25 to 0.75 times the first length a.

In an embodiment, the support member 220 may suppress tilt of the housing 140 and the bobbin 110 by having the first fixing part 221 fixed to the lower side of the housing 140 .

In addition, the tilt of the housing 140 and the bobbin 110 may be suppressed by reducing the length of the central axis of the support member 220 in the first direction by the first fixing part 221 .

In addition, there is an effect of improving the tilt defect when the lens driving device performs hand shake correction, and consequently reducing product defects.

In addition, in the embodiment, by using the plate-shaped support member 220 having a structure in which the spring constant can be adjusted, the tilt defect is improved and the distance between each fixing point of the support member 220 is shortened so that the spring constant is strong. It has the effect of smoothly correcting the hand shake of the lens driving device by properly adjusting the

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

The camera module according to the embodiment may include a lens barrel coupled to the bobbin 110 , an image sensor (not shown), and a printed circuit board 250 .

The lens barrel is the same as described above, and the printed circuit board 250 may form the bottom surface of the camera module from the portion where the image sensor is mounted.

In addition, the lens barrel may include at least one lens that transmits an image to the image sensor.

In addition, the camera module may further include an infrared cut filter (not shown). The infrared cut filter serves to block light in the infrared region from being incident on the image sensor.

In this case, in the base 210 illustrated in FIG. 2 , an infrared cut filter may be installed at a position corresponding to the image sensor, and may be coupled to a holder member (not shown). In addition, the holder member may support the lower side of the base 210 .

A separate terminal member may be installed on the base 210 to conduct electricity with the printed circuit board 250 , and it is also possible to integrally form the terminal using a surface electrode or the like.

Meanwhile, the base 210 may function as a sensor holder to protect the image sensor, and in this case, a protrusion may be formed in a downward direction along the side surface of the base 210 . However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed under the base 210 to perform its role.

Although only a few have been described as described above in relation to the embodiments, various other forms of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms unless they are incompatible with each other, and may be implemented as a new embodiment through this.

110: bobbin
120: first coil
130: first magnet
140: housing
210: base
214: support member seating groove
220: support member
221: first fixing part
222: first coupling part
223: second coupling part
224: first connection part
225: elastic deformation part
225a: first bent part
225b: second bent part
225c: second connection part
230: second coil

Claims (20)

Base;
a housing disposed on the base;
a bobbin disposed within the housing;
a magnet disposed on the housing;
a first coil disposed on the bobbin to face the magnet and moving the bobbin in an optical axis direction by interaction with the magnet; and
an upper elastic member disposed on the bobbin and coupled to the bobbin and the housing;
a circuit board disposed on the base;
a support member supporting the housing and including one end electrically connected to the upper elastic member and the other end electrically connected to the circuit board; and
and a damping part coupled to a part of the support member and the housing,
The damping part is spaced apart from the one end of the support member,
The damping part is disposed closer to the lowermost surface of the housing than to the upper surface of the housing. According to claim 1,
The damping unit is disposed in a corner region of the housing. According to claim 1,
The damping unit includes at least one of an epoxy, a thermosetting adhesive, and a photocurable adhesive. According to claim 1,
The damping unit is disposed closer to the upper surface of the base than the upper surface of the housing. According to claim 1,
The one end of the support member and the upper elastic member are electrically connected by a conductive adhesive,
The damping unit is spaced apart from the upper elastic member. According to claim 1,
The support member includes a coupling portion coupled to the base. 7. The method of claim 6,
The damping part is positioned higher than the coupling part of the support member. According to claim 1,
The support member is a lens driving device in the form of a wire. According to claim 1,
and a second coil disposed to face the magnet and moving the housing by interaction with the magnet. 10. The method of claim 9,
The second coil is electrically connected to the circuit board. According to claim 1,
The damping part is disposed closer to an upper surface of the circuit board than to the upper surface of the housing. According to claim 1,
The circuit board includes an upper surface disposed on the upper surface of the base, a terminal surface bent from the upper surface of the circuit board, and terminals formed on the terminal surface. According to claim 1,
The bobbin includes an upper support protrusion formed on an upper surface of the bobbin and a lower support protrusion formed on a lower surface of the bobbin,
The upper elastic member includes a through hole coupled to the upper support protrusion. According to claim 1,
A lens driving device in which a current is applied to the first coil through the upper elastic member and the supporting member. According to claim 1,
and a lower elastic member disposed under the bobbin and coupled to the bobbin and the housing. 16. The method of claim 15,
The damping unit is disposed closer to the lower elastic member than to the upper elastic member. Base;
a housing disposed on the base;
a bobbin disposed within the housing;
a magnet disposed on the housing;
a first coil disposed on the bobbin to face the magnet and moving the bobbin in an optical axis direction by interaction with the magnet; and
an upper elastic member disposed on the bobbin and coupled to the bobbin and the housing;
a circuit board disposed on the base;
a support member including one end coupled to the upper elastic member by a conductive adhesive; and
a damping part coupled to a portion of the support member and the housing;
The damping part is spaced apart from the one end of the upper elastic member and the support member,
The damping part is disposed closer to the lowermost surface of the housing than the one end of the support member. 18. The method of claim 17,
and a second coil disposed on the circuit board to face the magnet and moving the housing by interaction with the magnet. Base;
a housing disposed on the base;
a bobbin disposed within the housing;
a magnet disposed on the housing;
a first coil disposed on the bobbin to face the magnet and moving the bobbin in an optical axis direction by interaction with the magnet; and
an upper elastic member disposed on the bobbin and coupled to the bobbin and the housing;
a lower elastic member disposed under the bobbin and coupled to the bobbin and the housing;
a circuit board disposed on the base;
a support member supporting the housing and including one end electrically connected to the upper elastic member and the other end electrically connected to the circuit board; and
a damping part coupled to a portion of the support member and the housing;
The damping part is spaced apart from the one end of the upper elastic member and the support member,
The damping unit is disposed closer to the lower elastic member than to the upper elastic member. lens barrel;
The lens driving device according to any one of claims 1 to 19; and
A camera module containing an image sensor.

Images