KR20220119561A - Lens driving unit and camera module including the same - Google Patents

Abstract

An embodiment of the present invention includes: a base; a circuit board disposed on the base; a bobbin disposed on the circuit board and moving in an axis direction; and an adhesive bonding the circuit board to the base. The circuit board includes a terminal surface disposed on an outer surface of the base. The base includes a second depression groove formed at a lower surface of the base for injecting the adhesive to the base. The second depression groove is formed to be adjacent to the outer surface of the base to which the terminal surface of the circuit board is bonded.

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, each component constituting the camera module is separately manufactured and assembled to complete the camera module.

When a foreign material enters the lens driving device constituting the camera module when assembling the camera module, a malfunction of the lens driving device, deterioration of image quality of a photographed image, etc. may occur due to the introduced foreign material. In addition, the assembly of the lens driving device and the camera module should be made firmly.

For the above reasons, the lens driving device uses an adhesive to firmly bond each part, and at the same time, it fills the gap between the parts in contact with each other, that is, the gap, and seals the inside to prevent foreign substances from entering. can

This bonding operation should be able to achieve the above object, and at the same time, it is necessary to proceed quickly and efficiently.

Accordingly, an object of the embodiment is to provide a lens driving device and a camera module including the same having a structure capable of rapidly and efficiently bonding each component and sealing a gap.

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 circuit board disposed on the base; a bobbin disposed on the circuit board and moving in an optical axis direction; and an adhesive bonding the circuit board and the base, wherein the circuit board includes a terminal surface disposed on an outer surface of the base, wherein the base is formed on a lower surface of the base to inject the adhesive and a second recessed groove, wherein the second recessed groove is formed adjacent to the outer surface of the base to which the terminal surface of the circuit board is coupled.

The base may have a rectangular shape, and the second recessed groove may be formed in a side portion of the bottom surface of the base.

A support groove in which the terminal surface of the circuit board is disposed may be formed in an outer surface of the base.

The lens driving device may include an upper plate and a side plate connected to the upper plate, and a cover member for accommodating at least a portion of the bobbin and the circuit board.

A gap may be formed between the terminal surface, the base, and the side plate of the cover member, and the second recessed groove may have an inner side closed and an outer side open to communicate with the gap. A portion of the adhesive injected into the second recessed groove may be disposed in the gap.

The base may include a third recessed groove extending from the second recessed groove toward the center of the base. The base may include a fourth recessed groove extending from the second recessed recess in a corner direction of the base.

The base has a rectangular shape, and the second recessed groove includes four second recessed recesses formed on four sides of the bottom surface of the base, and the base is a corner of the base from the second recessed recess. It may include a fourth recessed groove extending in the direction and connecting the four second recessed grooves to each other.

The base may include a fourth recessed groove extending from the second recessed recess in a corner direction of the base. The second recessed groove may be inclined so as to increase in depth from the inside of the base toward the side of the base.

The lens driving device may include a housing disposed on the circuit board and accommodating the bobbin; a magnet disposed on the housing; and a first coil disposed on the bobbin and configured to move the bobbin in the optical axis direction by interaction with the magnet.

The lens driving device may include an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing; a second coil for moving the housing by interaction with the magnet; and a support member electrically connected to the upper elastic member and the circuit board. The second coil may be electrically connected to the circuit board.

A lens driving device according to another embodiment includes a base; a circuit board including a body disposed on an upper surface of the base and a terminal surface bent from the body and disposed on an outer surface of the base; a bobbin disposed on the circuit board and moving in an optical axis direction; a cover member including an upper plate and a side plate connected to the upper plate, the cover member accommodating at least a portion of the bobbin and the circuit board; and an adhesive bonding the terminal surface of the circuit board, the base, and the side plate of the cover member, wherein a support groove in which the terminal surface of the circuit board is disposed is formed on the outer surface of the base, The base includes a second recessed groove formed on a bottom surface of the base opposite to the top surface of the base for injecting the adhesive, and the second recessed groove is formed adjacent to the support groove of the base.

A camera module according to an embodiment includes a lens; A lens driving device according to an embodiment; and an image sensor.

In the embodiment, since the bonding operation is performed by injecting the adhesive through the first recessed groove, the gap at the portion where the end surfaces of the terminal surface, the cover member, and the base meet is completely sealed, and the terminal surface, the cover member, and the base are sufficient to each other. It has the effect of having a binding force.

In addition, there is an effect of facilitating the bonding operation between the terminal surface, the base, and the cover member by performing the bonding operation on the rear surface rather than the front surface where the terminals of the terminal surface are formed, and achieving complete sealing through the bonding operation.

In addition, since each recessed groove formed on the bottom of the base has a sloping structure that increases in depth from the inside to the outside, the adhesive flowing into each recessed groove flows more smoothly and flows into the gap, so that the bonding operation can be completed quickly. there is an effect

1 is an exploded perspective view illustrating a lens driving device according to an exemplary embodiment.
2 is a perspective view schematically illustrating a lens driving device according to an exemplary embodiment.
3 is a view showing a portion A of FIG. 2 .
4 is a view for explaining a bonding operation for coupling a lens driving device according to an embodiment.
5 is a bottom view illustrating a base according to an embodiment.
6 is a bottom view showing a base according to another embodiment.
7 is a bottom view showing a base according to another embodiment.
8 is a bottom view showing a base according to another embodiment.
9 is a bottom view showing a base according to another embodiment.
10 is a view showing a second recessed groove.
11 is a schematic view showing a side surface of a second recessed groove.

Hereinafter, an embodiment will be described in detail with reference to the accompanying drawings. Since the embodiment can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiment to a specific disclosed form, and should be understood to include all modifications, equivalents, and substitutions 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 in "up (up)" or "below (on or under)" of each element, on (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 y-axis mean a plane perpendicular to the optical axis. For convenience, the optical-axis direction (z-axis direction) may be referred to as the first direction, the x-axis direction as the second direction, and the y-axis direction as the third direction. .

1 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 by moving it with respect to a plane perpendicular to the first direction. A correction operation and/or an auto-focusing operation may be performed.

1 , the lens driving apparatus according to the embodiment may include a movable part 100 . In this case, the movable unit 100 may perform the functions of auto-focusing the lens and correcting hand shake. The movable part 100 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 is elastically supported by the upper and lower elastic members 150 and 160, and can perform an auto-focusing function by moving in the first direction.

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, the upper elastic member 150 may have a through hole corresponding to the upper support protrusion, and the lower elastic member 160 may have a through hole corresponding to the lower supporting protrusion. 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.

Also, as described above, a bobbin that is supported by the housing 140 and moves in the first direction may be disposed on the inner circumferential surface of the housing 140 . In the 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 the side surface.

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. 1 , the upper elastic member 150 may be provided in two pieces separated from each other. Through this two-division structure, each of the divided portions 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. At this time, according to the assembly sequence, the fixing operation can be finished by bonding using an adhesive after fixing by heat fusion.

The base 210 is disposed under the bobbin 110 and may be provided in 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 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 the 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 support member 220 .

Meanwhile, although the plate-shaped support member 220 is illustrated in FIG. 1 as an embodiment, 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 may move parallel to the x-axis and the y-axis, but may also move slightly inclined to the x-axis and the y-axis when moving while being supported by the support member.

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 the 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 the case of the 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 is not limited thereto, and the circuit 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 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. 1, 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 230 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, and accommodate the above-described movable part 100 , the second coil 230 , a part of the printed circuit board 250 , and the like, and may be coupled to the base 210 . have. The cover member 300 protects the movable part 100, the second coil 230, the printed circuit board 250, etc. accommodated therein from being damaged, and in particular, the first magnet 130 accommodated therein. , the first coil 120 , the second coil 230 , etc. may limit the leakage of the electromagnetic field to the outside so that the electromagnetic field is focused.

2 is a perspective view schematically illustrating a lens driving device according to an exemplary embodiment. 3 is a view showing a portion A of FIG. 2 .

In the embodiment, as shown in FIGS. 2 and 3 , the lens driving device is a first depression formed by being surrounded by a portion of the cross-section of the printed circuit board 250 , the cover member 300 and the base 210 . A groove g1 may be provided.

In this case, the printed circuit board 250 may include at least one bent terminal surface 253 , and the first recessed grooves g1 may be formed on both upper sides of the terminal surface 253 . In addition, concave portions 253a forming a part of the first recessed groove g1 may be formed on both upper sides of the terminal surface 253 .

The first recessed groove g1 is a gap between the printed circuit board 250 , the cover member 300 and the base 210 where the adhesive is introduced, that is, the adhesive permeates into the gap. It is a structure formed to fill the

Accordingly, the first recessed groove g1 includes a first surface f1 formed by one end of the terminal surface 253 , a second surface f2 formed by one end of the cover member 300 , and It may be provided to be surrounded by a third surface f3 formed by one end of the base 210 . In addition, the first recessed groove g1 may be provided such that the front is open and the rear is closed by the outer surface 210a of the base 210 .

As shown in FIG. 3 , the outer surface 210a of the base 210 forming the first recessed groove g1 may have a protrusion formed in the central portion. This is because the gap between the printed circuit board 250 , the cover member 300 and the base 210 is located in a portion facing the side surface of the protrusion, so that when the adhesive flows into the first recessed groove g1 , the protrusion This is because it flows down to the end face and easily permeates into the gap, so that bonding with an adhesive can be easily performed.

The first recessed grooves g1 may be provided as a pair spaced apart from each other by a predetermined distance. This is because the gap between the printed circuit board 250, the cover member 300, and the base 210 is located on both sides of the terminal surface 253 provided on the printed circuit board 250, so bonding the gap In order to do so, the first recessed groove g1 may be provided as a pair.

On the other hand, the adhesive used for the above bonding operation may be, for example, a polymer-based material such as epoxy. When the viscosity of the adhesive is low, since the fluidity is large, the bonding operation to fill the gap may be easily performed, but the bonding force may be weakened. On the other hand, in the case of an adhesive having a high viscosity, the bonding force is strong, but the fluidity is small, so it may not be easy to proceed with the bonding operation to fill the gap.

Therefore, it is necessary to proceed with the bonding operation using an adhesive having an appropriate viscosity in consideration of the easiness of operation and the bonding strength between the printed circuit board 250, the cover member 300 and the base 210 after the bonding operation. can

The width w of the first recessed groove (g1) measured along the longitudinal direction of the terminal surface 253 is the first recessed groove (g1) so that the needle of the adhesive injector performing the bonding operation can easily be used. It can be selected in consideration of whether it can enter into the first recessed groove (g1), the easiness of the forming operation, the easiness of the bonding operation, and the like.

Considering this point, it is appropriate that the first recessed groove (g1) be provided with 0.1 mm or more, preferably 0.3 mm or more, and more preferably 0.1 mm to 0.6 mm.

4 is a view for explaining a bonding operation for coupling a lens driving device according to an embodiment.

The bonding operation of bonding the terminal surface 253, the cover member 300, and the base 210 provided on the printed circuit board 250 with an adhesive may be performed using an application device equipped with an adhesive injector having a needle.

For example, as shown in FIG. 4, the needle of the adhesive injector from which the liquid adhesive comes out is moved in the longitudinal direction of the terminal surface 253, that is, in the left and right directions in the drawing, and the terminal surface 253 and the cover member 300. An operation of bonding the first gap G1 at the abutting portion and the second gap G2 at the contacting portion of the terminal surface 253 , the cover member 300 and the base 210 with an adhesive may be performed.

As shown in Figure 4, in the lens driving device provided with the first recessed groove (g1) of the embodiment, as described above, when the bonding operation is performed while moving the needle from the left to the right, it is easy in the first gap (G1). Bonding work can be done.

In addition, since the first recessed groove g1 is formed in the second gap G2 , the bonding operation may be easily performed even in the second gap G2 region. The specific bonding process is as follows, for example.

First, a needle is placed in the first recessed groove g1 located in the second gap G2 on the left side in the drawing, and the adhesive is sufficiently injected into the first recessed groove g1 . The injected adhesive is introduced into the first recessed groove (g1), and the second portion where the cross-sections of the terminal surface 253, the cover member 300, and the base 210 forming the first recessed groove g1 meet each other. It flows back into the gap G2.

Since a sufficient amount of adhesive flows into the second gap G2 through the first recessed groove g1, bonding between the terminal surface 253, the cover member 300, and the base 210 has sufficient bonding strength, and the second The gap G2 may be completely sealed. After the bonding operation for the second gap G2 is completed, the sealing operation for the first gap G1 may be performed.

Next, a bonding operation of filling the first gap (G1) is performed while moving the needle located in the first recessed groove (g1) to the right in the drawing.

In this case, if a sufficient amount of adhesive is injected into the first gap (G1) and the movement speed of the needle is appropriately adjusted, a sufficient bonding force is obtained between the terminal surface (253) and the cover member (300) and the first gap (G1) can be completely sealed.

Next, the needle is placed in the first recessed groove g1 located in the second gap G2 on the right in the drawing, and the same operation as the bonding operation performed in the second gap G2 on the left in the drawing is performed. do.

Through this operation, as described above, bonding between the terminal surface 253 , the cover member 300 , and the base 210 may have sufficient bonding force, and the second gap G2 may be completely sealed.

In the embodiment, since the bonding operation is performed by injecting an adhesive into the first recessed groove g1, the gap at the portion where the cross-sections of the terminal surface 253, the cover member 300, and the base 210 meet each other is completely sealed and , there is an effect that the terminal surface 253, the cover member 300, and the base 210 can have sufficient bonding force to each other.

5 is a bottom view showing the base 210 according to an embodiment. The base 210 of an embodiment includes the base 210 and the cover member 300 or the printed circuit board 250 in a portion coupled to the cover member 300 or the printed circuit board 250 on the bottom surface. A second recessed groove g2 to which the bonding adhesive is applied may be provided.

At this time, the terminal surface 253 bent on the printed circuit board 250 and the base 210 are bonded to each other, and the second recessed groove g2 is formed between the base 210 and the terminal surface 253 . ) may be provided at the binding site. In addition, the cover member 300 and the base 210 are bonded to each other and coupled, and the second recessed groove g2 may be provided at a portion where the cover member 300 and the base 210 are coupled. have.

In order to block the inflow of foreign substances from the outside into the lens driving device, it is necessary to proceed with the bonding operation. On the other hand, in the case of the bonding operation of sealing the gap at the portion where the terminal surface 253 , the base 210 , and the cover member 300 are coupled to each other with an adhesive, the operation is not easy due to the terminal of the terminal surface 253 .

That is, when the bonding operation is performed on the front surface of the terminal surface 253 on which the terminal is formed, the adhesive may be attached to the terminal. In the case of the terminal coated with adhesive, after the assembly operation of the lens driving device including the bonding operation is completed, poor contact or malfunction due to poor contact may occur during performance testing of the lens driving device or actual use of the lens driving device.

In addition, when the bonding operation is performed on the front surface where the terminal of the terminal surface 253 is formed, the movement of the needle for applying the adhesive to the portion where the terminal surface 253, the base 210, and the cover member 300 are combined with each other is performed. Since there are many interfering protrusion or depression structures, the bonding operation may not be performed smoothly, and the needle may be damaged or bent during the bonding operation.

Accordingly, the embodiment facilitates the bonding operation between the terminal surface 253, the base 210, and the cover member 300 by performing the bonding operation on the rear surface, not the front surface, where the terminals of the terminal surface 253 are formed, There is an effect that can achieve complete sealing through bonding operation.

Meanwhile, the base 210 may have a rectangular shape, and the second recessed groove g2 may be provided at each side portion of the rectangular shape. In addition, a portion where the terminal surface 253 of the cover member 300 or the printed circuit board 250 is coupled to the base 210 may be provided at each side portion of the quadrangle.

The second recessed groove (g2) is formed adjacent to the gap where the terminal surface 253, the base 210, and the cover member 300 contact each other, the inner side is closed and the outer side is provided so as to be open to communicate with the gap can be

Accordingly, the adhesive is injected into the second recessed groove (g2) and again flows into the gap located in the open portion of the second recessed groove (g2) to fill the gap and the bonding operation is completed. When a sufficient and appropriate amount of adhesive is injected into the second recessed groove g2, the gap may be completely filled and sealed.

6 is a bottom view showing the base 210 according to another embodiment. As shown in FIG. 6 , a third recessed groove g3 recessed in the center direction of the base 210 may be formed in the second recessed groove g2 .

The third recessed groove (g3) may be additionally formed in the second recessed groove (g2), and when the adhesive is injected into the third recessed groove (g3) during bonding operation, the adhesive is removed from the third recessed groove (g3). 2 It may flow into the gap through the recessed groove g2 to seal the gap.

The bonding operation of the point application method of injecting the adhesive into the third recessed groove (g3) is compared to the bonding operation of the linear application method in which the needle is placed at the first bonding site and the needle is moved along the linear gap, the needle is damaged, It has the effect of significantly reducing warpage.

7 is a bottom view showing the base 210 according to another embodiment. As shown in FIG. 7 , a fourth recessed groove g4 recessed in a corner direction of the base 210 may be formed in the second recessed groove g2 .

In this case, a plurality of the fourth recessed grooves g4 may be provided in portions symmetrical to each other based on the center of each side of the base 210 and an imaginary center line passing through the center of the base 210 . Although a pair of symmetrical fourth recessed grooves g4 is illustrated in FIG. 7 , the present invention is not limited thereto.

That is, the fourth recessed groove (g4) may be provided in a plurality of four or more symmetrical to each other. In addition, although each of the symmetrical fourth recessed grooves g4 is located at a portion symmetrical to each other, it is not necessary to be provided so as to be symmetrical to the shape thereof.

Like the third recessed groove (g3), the fourth recessed groove (g4) may be additionally formed in the second recessed groove (g2), and when an adhesive is injected into the fourth recessed groove (g4) during bonding operation, the adhesive may flow into the gap from the fourth recessed groove g4 through the second recessed groove g2 to seal the gap.

As described above, the point-coating bonding operation of injecting the adhesive into the fourth recessed groove g4 has the effect of remarkably reducing the breakage and bending of the needle compared to the above-described linear application-type bonding operation.

8 is a bottom view showing the base 210 according to another embodiment. As shown in Figure 8, the fourth recessed groove (g4) is formed in the corner portion of the base 210, the second recessed groove (g2) adjacent to the edge of the base 210 therebetween are the fourth They may be connected to each other by the recessed grooves g4.

Accordingly, the second recessed grooves g2 formed on the bottom surface of the base 210 may be provided to be connected to each other through the fourth recessed grooves g4 . In this case, the adhesive flowing into the fourth recessed groove (g4) flows into the adjacent second recessed grooves (g2) with the edge of the base 210 interposed therebetween, and passes through the second recessed grooves (g2) to the base. They may be introduced into adjacent gaps with the edge of 210 interposed therebetween.

9 is a bottom view showing the base 210 according to another embodiment. 9, in the second recessed groove (g2), the third recessed groove (g3) recessed in the center direction of the base (210) and the fourth recessed in the corner direction of the base (210) A recessed groove g4 is formed, and a plurality of the fourth recessed grooves g4 may be provided in portions symmetrical to each other.

In this case, a point-coating bonding operation of injecting an adhesive into the third recessed groove (g3) and/or the fourth recessed groove (g4) may be performed. On the other hand, similar to the embodiment described with reference to FIG. 8 , a fourth recessed groove g4 is formed in the edge portion of the base 210 , and the adjacent second recessed grooves g2 are formed with the edge of the base 210 interposed therebetween. It may be provided to be connected to each other by the fourth recessed groove (g4).

10 is a view showing the second recessed groove (g2). 11 is a schematic view showing a side surface f5 of the second recessed groove g2.

As shown in FIGS. 10 and 11 , the second recessed groove g2 including the fourth recessed groove g4 is the outside of the base 210 from the inside of the base 210 , that is, the base 210 . ) may be provided to be inclined so that the depth increases toward each side of the rectangle.

Due to this inclined structure, the adhesive p flowing into the fourth recessed groove g4 smoothly flows into the second recessed groove g2 due to the inclination, and passes through the second recessed groove g2 to close the gap, which is the bonding site. Fill bonding work can be completed quickly.

That is, as shown in FIG. 11 , the longest depth L2 of the second recessed groove g2 is greater than the shortest depth L1 of the fourth recessed groove g4 . The upper end of the side surface f5 of the second recessed groove g2 including the fourth recessed groove g4 during the bonding operation is horizontally or close to the horizontal, and thus the side surface f5 of the second recessed groove g2 is The lower end maintains the inclination, and thus the bottom of the second recessed groove g2 also maintains the inclination.

Therefore, the adhesive p flowing into the fourth recessed groove g4 may flow smoothly along the bottom of the inclined second recessed groove g2 and flow into the gap, which is a bonding site, to fill and seal the gap.

On the other hand, the second recessed groove (g2), the third recessed groove (g3), and the fourth recessed groove (g4) of each embodiment shown in FIGS. 5 to 9 are all from the inside to the outside of the base 210 as described above. It may be provided with an inclined structure so that the depth increases toward the .

Since each recessed groove formed on the bottom surface of the base 210 has a sloping structure that increases in depth from the inside to the outside, the adhesive p flowing into each recessed groove flows more smoothly and flows into the gap, so that the bonding operation is performed. It has the effect of being able to complete it quickly.

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 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), a printed circuit board 250 , and an optical system.

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 optical system may include at least one lens that transmits an image to the image sensor. In this case, an actuator module capable of performing an auto-focusing function and a hand-shake correction 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 apparatus 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 , 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.

210: base
210a: the outer surface of the base
250: printed circuit board
253: terminal plane
253a: recess
300: cover member
f1: first side
f2: 2nd side
f3: 3rd side
f5: side of the second recessed groove
G1: first gap
G2: second gap
g1: first recessed groove
g2: second recessed groove
g3: 3rd recessed groove
g4: 4th recessed groove
p: adhesive

Claims (16)

Base;
a circuit board disposed on the base;
a bobbin disposed on the circuit board and moving in an optical axis direction; and
An adhesive bonding the circuit board and the base,
the circuit board includes a terminal surface disposed on an outer surface of the base;
The base includes a second recessed groove formed on the bottom surface of the base to inject the adhesive,
The second recessed groove is formed adjacent to the outer surface of the base to which the terminal surface of the circuit board is coupled. According to claim 1,
The base has a rectangular shape, and the second recessed groove is formed in a side portion of the bottom surface of the base. According to claim 1,
A lens driving device in which a support groove in which the terminal surface of the circuit board is disposed is formed in an outer surface of the base. According to claim 1,
A lens driving apparatus comprising: an upper plate and a side plate connected to the upper plate; and a cover member for accommodating at least a portion of the bobbin and the circuit board. 5. The method of claim 4,
A gap is formed between the terminal surface, the base, and the side plate of the cover member,
The second recessed groove has an inner side closed and an outer side of the second recessed groove open to communicate with the gap. 6. The method of claim 5,
A portion of the adhesive injected into the second recessed groove is disposed in the gap. 3. The method of claim 2,
The base is a lens driving device including a third recessed groove extending from the second recessed groove toward the center of the base. 3. The method of claim 2,
The base is a lens driving device including a fourth recessed groove extending from the second recessed groove in the edge direction of the base. According to claim 1,
The base has a rectangular shape, and the second recessed groove includes four second recessed grooves formed on four sides of the bottom surface of the base,
The base includes a fourth recessed groove extending from the second recessed recess in a corner direction of the base and connecting the four second recessed recesses to each other. 8. The method of claim 7,
The base is a lens driving device including a fourth recessed groove extending from the second recessed groove in the edge direction of the base. 3. The method of claim 2,
The second recessed groove is formed to be inclined from the inside of the base to the side portion of the base to increase in depth. According to claim 1,
a housing disposed on the circuit board and accommodating the bobbin;
a magnet disposed on the housing; and
and a first coil disposed on the bobbin and configured to move the bobbin in the optical axis direction by interaction with the magnet. 13. The method of claim 12,
an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing;
a second coil for moving the housing by interaction with the magnet; and
and a support member electrically connected to the upper elastic member and the circuit board. 14. The method of claim 13,
The second coil is electrically connected to the circuit board. Base;
a circuit board including a body disposed on an upper surface of the base and a terminal surface bent from the body and disposed on an outer surface of the base;
a bobbin disposed on the circuit board and moving in an optical axis direction;
a cover member including an upper plate and a side plate connected to the upper plate, the cover member accommodating at least a portion of the bobbin and the circuit board; and
and an adhesive bonding the terminal surface of the circuit board, the base, and the side plate of the cover member,
A support groove in which the terminal surface of the circuit board is disposed is formed in the outer surface of the base;
The base includes a second recessed groove formed in the lower surface of the base opposite to the upper surface of the base in order to inject the adhesive,
The second recessed groove is a lens driving device formed adjacent to the support groove of the base. lens;
The lens driving device according to any one of claims 1 to 15; and
A camera module containing an image sensor.

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