KR20230006430A - Lens driving unit and camera module including the same - Google Patents

Abstract

An embodiment comprises: a base; a printed circuit board including a board arranged on top of the base, a terminal surface bent from a side surface of the board, and a plurality of terminals formed on the terminal surface; a housing arranged on top of the printed circuit board; a bobbin arranged inside the housing; a magnet arranged in the housing; a first coil arranged on the bobbin; an upper-side elastic member combined with an upper part of the bobbin and an upper part of the housing; a second coil facing the magnet in the direction of an optical axis; and a supporting member combined with the upper-side elastic member and supporting the housing. The base includes: an escape part formed by recessing the corner of the base and overlapping with the supporting member in the direction of the optical axis; and a first groove recessed from a first area of the lower surface of the base in contact with the escape part. Therefore, provided are a lens driving unit and a camera module including the same, wherein defects in assembly can be reduced during a bonding processing using adhesive.

Description

Lens driving unit and camera module including the same {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 contents described in this part simply provide background information on the embodiments and do not constitute prior art.

In recent years, the development of IT products such as mobile phones, smart phones, tablet PCs, and laptops with built-in micro digital cameras has been actively conducted.

In the case of an IT product in which a conventional subminiature digital camera is built-in, a lens driving device having an auto focusing device that aligns the focal length of the lens by adjusting the distance between the lens and an image sensor that converts external light into a digital image or a digital image. is built in.

The lens driving device and the camera module including the same may include a plurality of parts that are assembled by being bonded with an adhesive. Therefore, since assembly defects may occur during the bonding process using an adhesive, improvement is required.

Accordingly, the embodiment relates to a lens driving device capable of reducing assembly failure during an adhesive process and a camera module including the same.

The technical problem to be achieved by the embodiment is not limited to the technical problem mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

A lens driving device according to an embodiment includes a base; a printed circuit board including a substrate disposed on the base, a terminal surface bent from a side surface of the substrate, and a plurality of terminals formed on the terminal surface; a housing disposed on the printed circuit board; a bobbin disposed within the housing; a magnet disposed in the housing; a first coil disposed on the bobbin; an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing; a second coil facing the magnet in the optical axis direction; and a support member coupled to the upper elastic member and supporting the housing, wherein the base is formed by recessing a corner of the base and overlaps with the support member in an optical axis direction; and a first groove recessed from a first region of a lower surface of the base in contact with the relief portion.

The first groove may surround at least a portion of the relief portion. The base may include an extension portion protruding from a lower surface of the base and a second groove recessed from a second region of the lower surface of the base and surrounding the extension portion. The first groove and the second groove may be connected to each other. The terminal surface may be adhered to the extension part. The extension part may be disposed spaced apart from the relief part.

The base may include a hollow, and the terminal surface may be disposed on each of two side surfaces of the substrate positioned opposite to each other based on the hollow of the base.

The base includes a first relief formed at a first corner of the base and a second relief formed at a second corner of the base, and the extension is positioned between the first relief and the second relief. can do.

The magnet may include four magnets disposed on sides of the housing, and the second coil may include four coils facing the four magnets in the optical axis direction.

The bobbin may be movable in the optical axis direction by an interaction between the magnet and the first coil. The housing may be movable in a direction perpendicular to the optical axis direction by an interaction between the magnet and the second coil.

The support member may be electrically connected to the printed circuit board and may be disposed at corners of the housing, and the second coil may include a circuit member disposed on the substrate and a coil formed on the circuit member. can

The lens driving device may include an adhesive disposed between the printed circuit board and the base. A second depression into which a portion of the adhesive is introduced may be formed on an upper surface of the base.

The lens driving device may include an adhesive disposed between the terminal surface and the extension portion of the base.

A lens driving device according to another embodiment includes a base; a printed circuit board including a substrate disposed on the base, a terminal surface bent from a side surface of the substrate, and a plurality of terminals formed on the terminal surface; a housing disposed on the printed circuit board; a bobbin disposed within the housing; a magnet disposed in the housing; a first coil disposed on the bobbin; an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing; a second coil facing the magnet in the optical axis direction; and a support member engaged with the upper elastic member and supporting the housing, wherein the base is formed by recessing a corner of the base and overlaps with the support member in the optical axis direction, protruding from the lower surface of the base. It may include an extension part, and a first recessed part recessed from the lower surface of the base, and the first recessed part may be formed to contact the relief part and the extension part.

The extension part is disposed spaced apart from the relief part, and the first depression part includes a first groove surrounding at least a part of the relief part and a second groove surrounding at least a part of the extension part, and the first groove and the second groove can be connected to each other.

In an embodiment, since the excess adhesive can be accommodated in the first recessed portion provided on the lower side of the base, it is possible to prevent the adhesive from forming a protrusion on the lower surface of the base.

In addition, since the excess adhesive can be accommodated in the second recess provided on the upper side of the base, it is possible to prevent the adhesive from forming protrusions on the upper surface of the base.

In addition, since the formation of the protruding portion can be suppressed to maintain the flatness of the adhesive portion of the lower surface of the base with other components, height deviation during assembly of the lens driving device and the camera module can be eliminated or reduced.

In addition, by reducing or eliminating the height deviation, it is possible to eliminate or reduce the occurrence of defects when assembling the lens driving device and the camera module.

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 an exploded perspective view illustrating a part of a lens driving device according to an exemplary embodiment.
Figure 4 is a bottom perspective view of Figure 3;
5 is a bottom perspective view illustrating a part of a lens driving device according to an exemplary embodiment.
Figure 6 is a side view of Figure 5;
FIG. 7 is an enlarged view of portion A of FIG. 6 .
8 is a plan view of a base according to one embodiment.
9 is a bottom view of a base according to one embodiment.
10 is a bottom view of a base according to another embodiment.

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

Terms such as "first" and "second" may be used to describe various components, but the components should not be limited by the terms. These terms are only used 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 "upper (above)" or "lower (on or under)" of each element, on or under (on or under) ) includes both elements formed by directly contacting each other or by indirectly placing one or more other elements between the two elements. In addition, when expressed as “up (up)” or “down (down) (on or under)”, it may include the meaning of not only the upward direction but also the downward direction based on one element.

In addition, relational terms such as "upper/upper/upper" and "lower/lower/lower" used below 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 entity or element.

In addition, an orthogonal coordinate system (x, y, z) can be used in the drawing. In the drawing, the x-axis and the y-axis mean axes perpendicular to the optical axis, and for convenience, the optical axis direction (z-axis direction) may be referred to as a first direction, an x-axis direction as a second direction, and a y-axis direction 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 a captured image from being formed clearly due to vibration caused by the user's hand shake when capturing a still image. means a configured device.

In addition, the auto focusing device is a device that automatically focuses an image of a subject on an image sensor (not shown) surface. Such an image stabilization device and an auto-focusing device can be configured in various ways. In the case of an embodiment, an optical module composed of a plurality of lenses is moved in a first direction or moved on a plane perpendicular to the first direction to prevent such hand shake. A correction operation and/or an auto focusing operation may be performed.

As shown in FIGS. 1 and 2 , the lens driving device according to the embodiment may include a movable part. At this time, the movable unit may perform functions of auto focusing of the lens and hand shake correction. The movable unit may include the bobbin 110, the first coil 120, the first magnet 130, the housing 140, the upper elastic member 150, and the lower elastic member 160.

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

In addition, the bobbin 110 is elastically supported by the upper and lower elastic members 150 and 160 and moves in a 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 can be coupled to the inside of the bobbin 110 in various ways.

For example, a female screw thread may be formed on an inner circumferential surface of the bobbin 110 and a male screw thread corresponding to the screw thread may be formed on an outer circumferential surface of the lens barrel, and the lens barrel may be coupled to the bobbin 110 by screwing of the female screw thread. However, this 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 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 composed of one sheet, or two or more lenses may 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 an initial position, and when a reverse current is applied, the bobbin 110 may move downward from an initial position. Alternatively, the moving distance in one direction from the initial position may be increased or decreased by adjusting the amount of one-way current.

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 shape or a prismatic shape like the upper support protrusion described above, 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 hole may be fixedly coupled by thermal fusion or an adhesive member such as epoxy.

The housing 140 may have a hollow pillar 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 coupled to each other and disposed on the side surface of the housing 140 . In addition, as described above, the bobbin 110 guided by the elastic members 150 and 160 and moving in the first direction may be disposed inside the housing 140 .

The upper elastic member 150 and the lower elastic member 160 are coupled to the housing 140 and the bobbin 110, and the upper elastic member 150 and the lower elastic member 160 are the first part of the bobbin 110. upward and/or downward motion in the direction can be supported elastically. 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 a plurality separated from each other. Through this multi-division structure, each divided part of the upper elastic member 150 may receive currents of different polarities or different power sources. In addition, the lower elastic member 160 may also have a multi-division structure and be electrically connected to the upper elastic member 150 .

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.

The base 210 is disposed under the bobbin 110, may be provided in a substantially rectangular shape, and the printed circuit board 250 may be disposed or seated thereon.

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

The support member 220 is disposed on the side of the housing 140 and spaced apart from the housing 140, the upper side is coupled to the upper elastic member 150, and the lower side is the base 210, the printed circuit board 250 or the circuit It is coupled to the member 231 and supports the bobbin 110 and the housing 140 so as to be movable in a second direction and/or a third direction perpendicular to the first direction, and also the first coil (120) and can be electrically connected.

Since each support member 220 according to the embodiment is disposed on an outer surface of a corner of the housing 140, at least four may be installed symmetrically with each other. On the other hand, as shown in Figure 2, when the support member 220 is disposed in a pair on the outer edge of the corner of the housing 140, a total of eight may be installed symmetrically with each other.

Also, the support member 220 may be electrically connected to the upper elastic member 150 . That is, for example, the support member 220 may be electrically connected to a portion of the upper elastic member 150 where the through hole is formed.

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 through a conductive adhesive or soldering. Accordingly, the upper elastic member 150 may apply current to the first coil 120 through the electrically connected support member 220 .

The support member 220 may be connected to the printed circuit board 250 through a through hole formed in the circuit member 231 and the printed circuit board 250 . Alternatively, the support member 220 may be electrically soldered to a corresponding portion of the circuit member 231 without forming a through hole in the circuit member 231 and/or the printed circuit board 250 .

Meanwhile, in FIG. 2 , the linear support member 220 is illustrated as an embodiment, but is not limited thereto. That is, the support member 220 may be provided in the form of a plate-shaped member or the like.

The second coil 230 may perform hand shake 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 (or first direction) and y-axis (or second direction) 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 parallel to the x-axis and y-axis, but may also move slightly inclined to the x-axis and y-axis when moving while being supported by the support member 220 there is.

Therefore, 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 one embodiment, the second coil 230 may be disposed outside the first magnet 130 . Alternatively, the second coil 230 may be installed on the lower side of the first magnet 130 at a predetermined distance apart.

According to the embodiment, a total of four second coils 230 may be installed on the four sides of the circuit member 231, but is not limited thereto, one for the second direction and one for the third direction. It is possible that only two such as dogs are installed, and four or more may be installed.

Alternatively, 1 on the 1st side for the 2nd direction, 2 on the 2nd side for the 2nd direction, 1 on the 3rd side for the 3rd direction, and 2 on the 4th side for the 3rd direction, for a total of 6 It could be. Alternatively, in this case, the first side and the fourth side may be adjacent to each other, and the second side and the third side may be adjacent to each other.

In the embodiment, a circuit pattern may be formed on the circuit member 231 in the shape of the second coil 230, or a separate second coil may be disposed on the circuit member 231, but is not limited thereto, and the circuit pattern is not limited thereto. A circuit pattern may be formed directly on the member 231 in the shape of the second coil 230 .

Alternatively, it is also possible to configure the second coil 230 by winding a wire in a donut shape or to form the second coil 230 in an FP coil shape and electrically connect it to the printed circuit board 250.

The circuit member 231 including the second coil 230 may be installed or disposed on the upper surface of the printed circuit board 250 disposed above the base 210 . However, it is not limited thereto, and the second coil 230 may be disposed in close contact with the base 210 or may be disposed apart from each other by a certain distance, and may be formed on a separate substrate to attach the substrate to the printed circuit board 250. Stacked connections are also possible.

The printed circuit board 250 is electrically connected to at least one of the upper elastic member 150 and the lower elastic member 160 and coupled to the upper surface of the base 210, and as shown in FIG. 2, the A through hole into which the support member 220 is inserted may be formed at a position corresponding to an end of the support member 220 . Alternatively, it may be electrically connected and/or bonded to the support member without forming a through hole.

A terminal 251 may be disposed or formed on the printed circuit board 250 , and the terminal 251 may be disposed on the bent terminal surface 253 . A plurality of terminals 251 are disposed on the terminal surface 253 to receive external power and supply current to the first coil 120 and/or the second coil 230 . 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. Also, the printed circuit board 250 may include one or more terminal surfaces 253 .

The cover member 300 may be provided in a substantially box shape, accommodate the movable part, the second coil 230, and a part of the printed circuit board 250, and may be combined with the base 210. The cover member 300 can protect the movable part, the second coil 230, the printed circuit board 250, etc. accommodated therein from being damaged, and additionally, the first magnet 130 accommodated therein. ), the electromagnetic field generated by the first coil 120, the second coil 230, etc. may be restricted from leaking to the outside so that the electromagnetic field can be focused.

3 is an exploded perspective view illustrating a part of a lens driving device according to an exemplary embodiment. Figure 4 is a bottom perspective view of Figure 3; 5 is a bottom perspective view illustrating a part of a lens driving device according to an exemplary embodiment. Figure 6 is a side view of Figure 5; FIG. 7 is an enlarged view of portion A of FIG. 6 .

In an embodiment, the circuit member 231 on which the second coil 230 is formed may be coupled or fixed to the printed circuit board 250 by, for example, an adhesive or soldering, and the second coil 230 It is electrically connected to the printed circuit board 250 and can receive current from the printed circuit board 250 .

The second coil 230 receives current from the printed circuit board 250 and moves the housing 140 in the second and/or third directions through electromagnetic interaction with the first magnet 130. It is possible to perform image stabilization of the lens driving device by moving it.

The printed circuit board 250 may be bonded or fixed to the base 210 disposed on the lower side by being adhered by, for example, an adhesive. At this time, an adhesive may be applied to the lower surface of the printed circuit board 250 and the inner surface of the terminal surface 253 .

As shown in FIGS. 3 and 4 , the terminal surface 253 may be formed bent on the side surface of the printed circuit board 250, and the number may be 1 to 4 in an embodiment. In one embodiment, when the printed circuit board 250 is formed of a flexible material, when the terminal surface 253 is integrally formed on the printed circuit board 250 and adhered to the base 210, the terminal surface 253 ) can be bent to adhere to the corresponding portion of the base 210.

The base 210 may be coated with an adhesive on a portion corresponding to the lower surface of the printed circuit board 250 and the inner surface of the terminal surface 253 . Of course, when bonding the printed board and the base 210, the adhesive may be applied to only one of the base 210 and the printed circuit board 250, or the adhesive may be applied to both the base 210 and the printed circuit board 250. may be

The base 210 may be formed with a bent portion 212 corresponding thereto for adhesion to the inner surface of the terminal surface 253 of the printed circuit board 250 . That is, the bent portion 212 may be formed at a portion of the base 210 corresponding to the terminal surface 253 and adhered to the terminal surface 253 .

Specifically, as shown in FIG. 7, the inner surface of the terminal surface 253 and the outer surface of the bent portion 212 are disposed to face each other, and an adhesive portion P is formed therebetween. The terminal surface 253 and the bent portion 212 may be bonded to each other by interposing an adhesive in the bonding portion P.

Therefore, as described above, a plurality of the terminal surfaces 253 are provided on the printed circuit board 250, and accordingly, the number of the bent portions 212 corresponds to the number of the terminal surfaces 253. It may be provided in a position corresponding to.

As shown in FIGS. 3 and 4 , for example, the printed circuit board 250 has a rectangular shape when viewed in the first direction, and the terminal surface 253 is one part of the printed circuit board 250. It can be formed by bending from the sides.

Accordingly, the base 210 is formed to have a rectangular shape when viewed in the first direction corresponding to the terminal surface 253, and the bent portion 212 extends from the side of the base 210 to form a bend. It can be.

Meanwhile, an escape part 213 may be formed on the base 210, and the escape part 213 may be formed by recessing the corner of the base 210. In the embodiment, since the escape parts 213 are formed at each corner of the base 210, a total of four escape parts 213 may be formed on the base 210.

The relief skin 213 may be formed to be spaced apart from the front and rear ends of the bent portion 212 in the longitudinal direction, and the portion where the relief skin 213 and the bent portion 212 are spaced apart will be described below. A first depression 211 may be formed.

The relief portion 213 may be formed to observe a state in which the support member 220 is soldered to the circuit member 231 and/or the printed circuit board 250 . In particular, when a through hole is formed in the circuit member 231 and the printed circuit board 250, and the lower end of the support member 220 is inserted into the through hole, the support member 220 is formed on the lower surface of the printed circuit board 250. ) is inserted, it is possible to determine whether or not it is defective by observing the soldering state.

In addition, although described in detail below, the first recessed portion 211 may be formed to surround at least a portion of the relief portion 213, for example.

On the other hand, in the case of a structure in which through-holes are not formed in the circuit member 231 and/or the printed circuit board 250 and the support member 220 is electrically soldered to a corresponding portion of the circuit member 231, the escape Part 213 may not be formed.

When the relief portion 213 is not formed, the first recessed portion 211 may be formed at a corner portion of the base 210 on the lower surface of the base 210 , for example.

When the adhesive is insufficiently applied to the bonding portion P between the base 210 and the printed circuit board 250, a gap may occur between the base 210 and the printed circuit board 250.

In particular, when the adhesive is insufficiently applied between the terminal surface 253 and the bent portion 212, a gap may occur between the terminal surface 253 and the bent portion 212, and due to the occurrence of such a gap, the terminal surface 253 may be spaced apart from the bent portion 212 and placed in an undesirable position. In this case, it may cause assembly failure and product failure.

Therefore, it is appropriate that an adhesive is sufficiently applied to the bonding portion P between the base 210 and the printed circuit board 250 . On the other hand, when the adhesive is excessively applied to the bonding portion P, the following problems may occur.

If the adhesive is excessively applied to the bonding portion P, the excess adhesive may flow into the lower side of the base 210 and be cured. The adhesive introduced into the lower side of the base 210 and cured may form a protrusion.

Therefore, a filter (not shown) disposed below the base 210 and coupled to the base 210 and a holder (not shown) on which the filter is mounted are not adhered as designed due to the protrusion, and the adhesive portion ( A gap may be formed in P), and a height deviation may occur locally in the overall height of the camera module including the lens driving device.

Such a height deviation may cause defects in the lens driving device and the camera module. On the other hand, even when the adhesive is sufficiently applied to the bonding portion P, defects due to the height deviation may occur, so a structure capable of preventing this problem needs to be formed in the base 210.

To this end, in the embodiment, a first recessed part 211 may be provided on the lower surface of the base 210, and a second recessed part 214 may be provided on the upper surface of the base 210. The first recessed portion 211 and the second recessed portion 214 will be described in detail below.

The first recessed portion 211 may be formed on a lower surface of the base 210 at a portion where the terminal surface 253 of the printed circuit board 250 is bonded. The first recessed portion 211 may serve to contain the excess adhesive and suppress the formation of the protrusion caused by the adhesive flowing into the lower surface of the base 210 and curing.

In particular, the first recessed portion 211 is applied to the lower surface of the printed circuit board 250 and/or the upper surface of the base 210, the terminal surface 253, and/or the bent portion 212. Since the applied adhesive serves to prevent the formation of protrusions on the lower surface of the base 210 by flowing into the lower surface of the base 210, it is appropriate to form around the bent part 212.

Since the adhesive has surface tension in a liquid state, the flow path of the adhesive flowing out from the terminal surface 253 and/or the bent portion 212 is changed by the surface tension at the bottom of the side surface of the base 210, so that the base 210 ), and the first recessed portion 211 may accommodate the introduced adhesive.

4 and 5, since the first recessed portion 211 is recessed on the lower surface of the base 210, even if the adhesive introduced into the first recessed portion 211 is cured, the lower surface of the base 210 do not form protrusions on Therefore, the lower surface of the base 210 can maintain flatness.

Therefore, the first recessed portion 211 can prevent or reduce product defects of the lens driving device and the camera module due to the protruding portion formed by the adhesive. A detailed structure of the first recessed portion 211 will be described below with reference to FIGS. 9 and 10 .

8 is a plan view of base 210 according to one embodiment. As shown in FIG. 8 , the base 210 may have a second recessed portion 214 on an upper surface thereof.

The second recessed portion 214 is a portion through which excess adhesive for bonding the printed circuit board 250 and the base 210 is introduced. Therefore, among the adhesives applied to the lower surface of the printed circuit board 250 and/or the upper surface of the base 210, excess adhesive may be accommodated.

Accordingly, the second concave portion 214 can reduce a height deviation in which the printed circuit board 250 locally differs in height with respect to the base 210 in the first direction due to excessive adhesive. In addition, it is possible to reduce the occurrence of defects in the lens driving device and the camera module due to such a height deviation.

In addition, excess adhesive flows out to the outside of the base 210 and the printed circuit board 250 and is cured to prevent the formation of protrusions, thereby reducing the occurrence of product defects due to these protrusions.

In addition, it is possible to reduce the flow of excess adhesive along the bent portion 212 and/or the terminal surface 253 to the lower surface of the base 210 . In addition, excess adhesive flows down the outside of the terminal surface 253 and is applied and cured to the terminal 251 formed on the terminal surface 253 to reduce product defects.

As shown in FIG. 8 , the base 210 may have a circular hollow S, and the second concave portion 214 is formed, for example, along the circumferential surface of the hollow S. It could be.

In addition, as shown in FIG. 8, a plurality of second recessed parts 214 are provided, and each second recessed part 214 is disposed at regular intervals along the circumferential surface of the hollow S. may be On the other hand, although not shown, the second recessed portion 214 may be formed in a donut shape surrounding the hollow (S).

Also, although not shown, the second recessed portion 214 may be formed in various shapes at various positions on the upper surface of the base 210 . For example, the second recessed portion 214 may be formed along each side of the upper surface of the base 210 .

In addition, when the relief portion 213 is not formed on the base 210, it may be formed on a corner portion of the base 210. In addition, when viewed in the first direction, the second recessed portion 214 may be provided in various shapes such as a closed curve, a polygon, a circle, and the like.

9 is a bottom view of base 210 according to one embodiment. As shown in FIG. 9 , the first recessed portion 211 may be formed to surround at least a portion of the bent portion 212 . Since the excess adhesive flows into the lower surface of the base 210 by surface tension at the point where the bent part 212 starts, it may be appropriate to form it so as to surround a part of the bent part 212 .

Specifically, for example, the first recessed portion 211 may be formed to surround at least a portion of the front and rear ends of the bent portion 212 . Formation of the first recessed portion 211 may be appropriate because the excess adhesive mainly flows into the lower surface of the base 210 from the starting point of the bent portion 212 at the front and rear ends of the bent portion 212. there is.

Also, for example, a portion of the first recessed portion 211 may be formed in the longitudinal direction of the bent portion 212 and the rest may be formed along the relief portion 213 . In this case, the first recessed portion 211 may be formed to surround at least a portion of the relief portion 213 .

The first recessed part 211 formed in this structure sufficiently accommodates the excess adhesive flowing into the first recessed part 211 at the starting point of the bent part 212 at the front and rear ends of the bent part 212. space can be provided.

That is, a portion of the adhesive flowing into the lower surface of the base 210 flows into the first recessed portion 211 formed along the relief portion 213, and the remaining portion is formed in the longitudinal direction of the bent portion 212 It may flow into the first recessed portion 211 .

The adhesive may be cured by flowing along the first concave portion 211 by surface tension, and thus the protruding portion is not formed on the lower surface of the base 210, and other parts such as the holder on the lower surface of the base 210 It is possible to maintain the flatness of the parts and parts to be bonded.

10 is a bottom view of a base 210 according to another embodiment. As shown in FIG. 10, the first recessed portion 211 may be discontinuously formed in plurality in the longitudinal direction of the bent portion 212, and may be formed to surround the front and rear ends of the bent portion 212. can

That is, the first recessed portion 211 may not be formed at the center of the bent portion 212 but may be formed to surround the front and rear ends of the bent portion 212 . This structure can prevent bending of the bent portion 212 .

In other words, when the thickness of the base 210 at the portion where the bent portion 212 is formed becomes thin due to the formation of the first recessed portion 211, the bent portion 212 is bent in the lateral direction, that is, bending may occur

Therefore, when the first recessed part 211 is formed only at the front and rear ends of the bent part 212, the central part can firmly fix the bent part 212, so that the side of the bent part 212 There is an effect of preventing or reducing directional bending.

In addition, the first recessed portion 211 may have various shapes and numbers and may be provided at various positions on the lower surface of the base 210 . However, as shown in FIGS. 9 and 10 , it is appropriate that the first recessed portion 211 is provided in a form surrounding the front and rear ends of the bent portion 212 .

As described above, the adhesive flowing into the lower surface of the base 210 from the terminal surface 253 and the bent portion 212 mainly protrudes from the front and rear ends of the bent portion 212. This is because it can flow to the lower surface of the base 210.

In addition, for easy formation, the first recessed portion 211 may be formed so that one side is closed and the other side is open when viewed in the second or third direction, and the other open side ends at the side of the base 210. there is.

On the other hand, although not shown, the first recessed portion 211 may be provided with a step in order to more reliably prevent the adhesive from flowing into the lower surface of the base 210 .

This level difference is because even when the adhesive overflows the first end of the first recessed portion 211, the second end can block the adhesive from flowing into the adhesive portion on the lower surface of the base 210. Of course, the level difference may be provided with a third or higher level.

In the embodiment, since excess adhesive may be accommodated in the first recessed portion 211 provided on the lower side of the base 210, it is possible to prevent the adhesive from forming protrusions on the lower surface of the base 210.

In addition, since excess adhesive can be accommodated in the second recessed portion 214 provided on the upper side of the base 210, it is possible to prevent the adhesive from forming protrusions on the upper surface of the base 210.

In addition, since the formation of the protruding portion can be suppressed to maintain the flatness of the bonding portion of the lower surface of the base 210 with other components, height deviation during assembly of the lens driving device and the camera module can be eliminated or reduced.

In addition, by reducing or eliminating the height deviation, it is possible to eliminate or reduce the occurrence of defects when assembling the lens driving device and the camera module.

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

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

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

Also, the optical system may include at least one lens that transmits an image to the image sensor. At this time, an actuator module capable of performing an auto focusing function and a hand shake compensation function may be installed in the optical system. The actuator module performing the auto focusing function may be configured in various ways, and a voice coil unit motor is generally used. The lens driving device according to the above-described embodiment may serve as an actuator module that performs both an auto-focusing function and a hand-shake correction function.

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 base 210 may support the lower side of the holder member.

A separate terminal member may be installed on the base 210 to conduct electricity with the printed circuit board 250, or the terminal may be integrally formed 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 downward along a side surface of the base 210 . However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed below 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 through this, may be implemented in a new embodiment.

110: bobbin
120: first coil
130: first magnet
140: housing
210: base
211: first depression
212: bend
213: escape
214: second depression
220: support member
230: second coil
231: circuit member
250: printed circuit board

Claims (20)

Base;
a printed circuit board including a substrate disposed on the base, a terminal surface bent from a side surface of the substrate, and a plurality of terminals formed on the terminal surface;
a housing disposed on the printed circuit board;
a bobbin disposed within the housing;
a magnet disposed in the housing;
a first coil disposed on the bobbin;
an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing;
a second coil facing the magnet in the optical axis direction; and
A support member engaged with the upper elastic member and supporting the housing;
The base is
a relief portion formed by recessing a corner of the base and overlapping the support member in an optical axis direction; and a first groove recessed from a first region of a lower surface of the base in contact with the relief portion. According to claim 1,
The first groove surrounds at least a portion of the relief portion. According to claim 1,
The base includes an extension portion protruding from a lower surface of the base and a second groove recessed from a second region of the lower surface of the base and surrounding the extension portion. According to claim 3,
The lens driving device wherein the first groove and the second groove are connected to each other. According to claim 3,
The terminal surface is bonded to the extension portion of the side surface portion. According to claim 1,
The extension part is disposed spaced apart from the escape part. According to claim 1,
The base includes a hollow,
The terminal surface is disposed on each of two side surfaces of the substrate positioned opposite to each other with respect to the hollow of the base. According to claim 3,
The base includes a first relief formed at a first corner of the base and a second relief formed at a second corner of the base,
The extension part is located between the first escape part and the second escape part. According to claim 1,
wherein the magnet includes four magnets disposed on sides of the housing, and the second coil includes four coils opposing the four magnets in the optical axis direction. According to claim 1,
The bobbin is movable in the optical axis direction by interaction between the magnet and the first coil. According to claim 1,
The lens driving device of claim 1 , wherein the housing is movable in a direction perpendicular to the optical axis direction by an interaction between the magnet and the second coil. According to claim 1,
The support member is disposed at corners of the housing and is electrically connected to the printed circuit board. According to claim 1,
The second coil includes a circuit member disposed on the substrate and a coil formed on the circuit member. According to claim 1,
A lens driving device comprising an adhesive disposed between the printed circuit board and the base. According to claim 1,
A second concave portion into which a portion of the adhesive is introduced is formed on the upper surface of the base. According to claim 1,
A lens driving device comprising an adhesive disposed between the terminal surface and the extension portion of the base. Base;
a printed circuit board including a substrate disposed on the base, a terminal surface bent from a side surface of the substrate, and a plurality of terminals formed on the terminal surface;
a housing disposed on the printed circuit board;
a bobbin disposed within the housing;
a magnet disposed in the housing;
a first coil disposed on the bobbin;
an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing;
a second coil facing the magnet in the optical axis direction; and
A support member engaged with the upper elastic member and supporting the housing;
The base is
A corner of the base is formed by being depressed and includes an escape portion overlapping the support member in the optical axis direction, an extension portion protruding from the lower surface of the base, and a first depression portion that is depressed from the lower surface of the base,
The first concave portion is formed to contact the relief portion and the extension portion. According to claim 17,
The extension is disposed spaced apart from the relief,
The first recessed portion includes a first groove surrounding at least a portion of the relief portion and a second groove surrounding at least a portion of the extension portion, the first groove and the second groove being connected to each other. According to claim 17,
A lens driving device comprising an adhesive disposed between the terminal surface and the extension portion of the base. Base;
a printed circuit board including a substrate disposed on the base, a terminal surface bent from a side surface of the substrate, and a plurality of terminals formed on the terminal surface;
a housing disposed on the printed circuit board;
a bobbin disposed within the housing;
a magnet disposed in the housing;
a first coil disposed on the bobbin; and
A lens driving device including an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing.

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