KR102641905B1 - Lens driving unit and camera module including the same - Google Patents

Abstract

The embodiment includes a base, a circuit board disposed on the base, a bobbin disposed on the circuit board and moving in the optical axis direction, and an adhesive joining the circuit board and the base, and the circuit board is disposed on the outer surface of the base. It includes a terminal surface, and the base includes a second recessed groove formed on the bottom of the base for injecting adhesive, and the second recessed groove is formed adjacent to the outer surface of the base where the terminal surface of the circuit board is coupled. .

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 simply provides background information on the embodiments and does not constitute prior art.

Recently, the development of IT products such as mobile phones, smartphones, tablet PCs, and laptops with built-in ultra-small digital cameras is actively underway.

In the case of camera modules mounted on small electronic products such as smartphones, each part that makes up the camera module is manufactured separately and assembled to complete the camera module.

When assembling a camera module, if foreign substances enter the lens driving device constituting the camera module, the foreign substances may cause malfunction of the lens driving device and deterioration of the image quality of captured images. Additionally, the assembly of the lens drive device and camera module must be done firmly.

For the above reasons, the lens driving device uses adhesive to firmly join each part, and at the same time, a bonding operation is performed to fill the gaps where each part touches each other and seal it to prevent foreign substances from entering the inside. You can.

This bonding operation must be able to achieve the above-mentioned purpose, and at the same time, it needs to be carried out quickly and efficiently.

Accordingly, the purpose of the embodiment is to provide a lens driving device and a camera module including the same, which have a structure that can quickly and efficiently perform a bonding operation to firmly combine each component and seal the gap.

The technical problems to be achieved by the embodiment are not limited to the technical problems mentioned above, and other technical problems not mentioned can 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 circuit board disposed on the base; a bobbin disposed on the circuit board and moving in the optical axis direction; and an adhesive that couples the circuit board and the base, wherein the circuit board includes a terminal surface disposed on an outer surface of the base, and the base is formed on the bottom of the base for injecting the adhesive. It includes a second recessed groove, and 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 has a square outer shape, and the second recessed groove may be formed in a side portion of the bottom of the base.

A support groove in which the terminal surface of the circuit board is disposed may be formed on 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 may include a cover member accommodating at least a portion of the bobbin and the circuit board.

A gap may be formed between the terminal face, the base, and the side plate of the cover member, and the second recessed groove may be closed on the inside and open on the outside 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 groove toward an edge of the base.

The base has a square shape, the second recessed groove includes four second recessed grooves formed on four sides of the bottom of the base, and the base has a corner of the base from the second recessed groove. 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 groove toward an edge of the base. The second recessed groove may be formed to be inclined so that the depth increases from the inside of the base to the side of the base.

The lens driving device includes a housing disposed on the circuit board and accommodating the bobbin; A magnet disposed in the housing; and a first coil disposed on the bobbin and moving the bobbin in the optical axis direction by interacting with the magnet.

The lens driving device includes an upper elastic member coupled to the upper part of the bobbin and the upper part of the housing; a second coil that moves the housing by interacting 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 the 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 the optical axis direction; a cover member including an upper plate and a side plate connected to the upper plate, and accommodating at least a portion of the bobbin and the circuit board; and an adhesive that joins the terminal face of the circuit board, the base, and the side plate of the cover member, wherein a support groove in which the terminal face of the circuit board is disposed is formed on the outer surface of the base, The base includes a second recessed groove formed in a bottom surface of the base opposite the upper 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; Lens driving device according to an embodiment; and an image sensor.

In the embodiment, the bonding operation is performed by injecting adhesive through the first recessed groove, so that the gap at the area where the cross sections of the terminal face, cover member, and base meet each other is completely sealed, and the terminal face, cover member, and base are sufficiently connected to each other. It has the effect of creating cohesion.

In addition, by performing the bonding work on the back side of the terminal face rather than the front side where the terminal is formed, the bonding work between the terminal face, the base, and the cover member is facilitated, and complete sealing can be achieved through the bonding work.

In addition, each depression formed on the bottom of the base has an inclined structure whose depth increases from the inside to the outside, so the adhesive flowing into each depression flows more smoothly and flows into the gap, allowing the bonding work to be completed quickly. There is an effect.

Figure 1 is an exploded perspective view showing a lens driving device according to an embodiment.
Figure 2 is a perspective view schematically showing a lens driving device according to an embodiment.
Figure 3 is a diagram showing part A of Figure 2.
Figure 4 is a diagram for explaining a bonding operation for combining a lens driving device according to an embodiment.
Figure 5 is a bottom view showing a base according to one embodiment.
Figure 6 is a bottom view showing a base according to another embodiment.
Figure 7 is a bottom view showing a base according to another embodiment.
Figure 8 is a bottom view showing a base according to another embodiment.
Figure 9 is a bottom view showing a base according to another embodiment.
Figure 10 is a diagram showing the second recessed groove.
Figure 11 is a schematic diagram showing the side of the second recessed groove.

Hereinafter, the embodiment will be described in detail with reference to the attached drawings. Since the embodiments can be subject to various changes and have various forms, specific embodiments will be illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiment to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical 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”, “second”, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. Additionally, terms specifically defined in consideration of the configuration and operation of the embodiment are only for explaining the embodiment and do not limit the scope of the embodiment.

In the description of the embodiment, in the case where each element is described as being formed "on or under", ) includes two elements that are in direct contact with each other or one or more other elements that are formed (indirectly) between the two elements. Additionally, when expressed as “up” or “on or under,” it can include not only the upward direction but also the downward direction based on one element.

In addition, relational terms such as "top/top/top" and "bottom/bottom/bottom" 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.

Additionally, a rectangular coordinate system (x, y, z) can be used in the drawing. In the drawing, the x-axis and y-axis refer to planes perpendicular to the optical axis. For convenience, the optical axis direction (z-axis direction) can be referred to as the first direction, the x-axis direction can be referred to as the second direction, and the y-axis direction can be referred to as the third direction. .

Figure 1 is an exploded perspective view showing a lens driving device according to an embodiment.

An image stabilization device applied to small camera modules of mobile devices such as smartphones or tablet PCs is used to prevent the outline of the captured image from being formed clearly due to vibration caused by the user's hand shaking when shooting still images. It means a configured device. Additionally, the auto focusing device is a device that automatically focuses the image of the subject onto the image sensor (not shown). Such hand shake correction devices and auto focusing devices can be configured in various ways. In the embodiment, an optical module composed of a plurality of lenses is moved in a first direction or moved against a plane perpendicular to the first direction to prevent hand shake. Compensation operations and/or auto-focusing operations may be performed.

As shown in FIG. 1, the lens driving device according to the embodiment may include a movable part 100. At this time, the movable part 100 may perform the functions of auto-focusing and camera shake correction of the lens. 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 its outer peripheral surface, and is subject to electromagnetic interaction between the first magnet 130 and the first coil 120. It can be installed in the internal space of the housing 140 to be movable back and forth in the first direction. 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 move in the first direction to perform an auto-focusing function.

The bobbin 110 may include a lens barrel (not shown) in which at least one lens is installed. The lens barrel can 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 together. However, this is not limited, and the lens barrel may be directly fixed to the inside of the bobbin 110 using a method other than screwing, without forming a thread on the inner peripheral surface of the bobbin 110. Alternatively, it is also possible for the one or more lenses to be formed integrally with the bobbin 110 without a lens barrel.

The lens coupled to the lens barrel may be composed of one piece, 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 amount of one-way current can be adjusted to increase or decrease the moving distance in one direction from the initial position.

A plurality of upper and lower support protrusions may be formed to protrude on the upper and lower surfaces of the bobbin 110. The upper support protrusion may be provided in a cylindrical or prismatic shape, and may couple and secure the upper elastic member 150. The lower support protrusion may be provided in a cylindrical or prismatic shape like the above-mentioned upper support protrusion, and may couple and secure the lower elastic member 160.

At this time, 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 supporting protrusions and the holes can be fixedly coupled to each other by an adhesive member such as heat fusion or epoxy.

The housing 140 has the shape of a hollow pillar supporting the first magnet 130 and may be formed in a substantially square shape. The first magnet 130 and the support member 220 may be combined and disposed on the side portion of the housing 140.

Additionally, as described above, a bobbin that is supported by the housing 140 and moves in the first direction may be disposed on the inner peripheral surface of the housing 140. In an embodiment, the first magnet 130 may be placed at a corner of the housing 140, and a support member 220 may be placed on the side.

The upper elastic member 150 and the lower elastic member 160 may elastically support the upward and/or downward motion 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 as two separate pieces. Through this two-part structure, each divided part of the upper elastic member 150 can receive currents of different polarities or different power sources. Additionally, as a modified example, the lower elastic member 160 may be configured as a two-part structure, and the upper elastic member 150 may be configured as an integrated structure.

Meanwhile, the upper elastic member 150, lower elastic member 160, bobbin 110, and housing 140 may be assembled through heat fusion and/or bonding using an adhesive, etc. At this time, the fixing work can be completed by heat fusion fixation according to the assembly sequence and then bonding using an adhesive.

The base 210 is disposed below the bobbin 110 and can be provided in a substantially square shape, on which the printed circuit board 250 is seated, and the lower side of the support member 220 can be fixed. Additionally, a support member 220 seating groove 214 into which the support member 220 can be inserted may be formed concavely on the upper surface of the base 210. Adhesive may be applied to the seating groove 214 of the support member 220 to fix the support member 220 so that it does not move.

A support groove of a corresponding size may be formed on the 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 to be concave inward at a certain depth from the outer peripheral surface of the base 210, so that the portion where the terminal surface 253 is formed can be prevented from protruding outward or the amount of protrusion can be adjusted.

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

Since the support members 220 according to the embodiment are each disposed on the outer surface of the square of the housing 140, a total of four support members 220 can be installed symmetrically. However, this is not limited, and it is possible to consist of 8 pieces, 2 for each straight side. Additionally, the support member 220 may be electrically connected to the upper elastic member 150, or may be electrically connected to the straight surface of the upper elastic member 150.

Additionally, 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 can be electrically connected through conductive adhesive, soldering, etc. Accordingly, the upper elastic member 150 can apply current to the first coil 120 through the electrically connected support member 220.

Meanwhile, in Figure 1, the plate-shaped support member 220 is shown as an example, but 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 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 and y-axis directions as well as the x-axis and y-axis directions. That is, from the driving aspect of the embodiment, the housing may move parallel to the x-axis and y-axis, but may also move slightly inclined to the x-axis and y-axis when moved while supported by a support member.

Additionally, the first magnet 130 needs to be installed at a location corresponding to the second coil 230.

The second coil 230 may be arranged 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 below the first magnet 130 at a certain distance apart.

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

In the case of the embodiment, a circuit pattern in the shape of the second coil 230 may be formed on the circuit member 231, and additionally, a separate second coil may be disposed on the circuit member 231, but the present invention is not limited to this, and the circuit Instead of 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, it is also possible to configure the second coil 230 by winding a wire in a donut shape, or by forming the second coil 230 in the form of an FP coil and electrically connecting it 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 on the upper side of the base 210. However, this is not limited, and the second coil 230 may be placed in close contact with the base 210, or may be placed at a certain distance apart, and may be formed on a separate board and attached to the printed circuit board 250. Laminated connections are also possible.

The printed circuit board 250 is coupled to the upper surface of the base 210, and as shown in FIG. 1, a hole or groove is formed at a corresponding position so that the seating groove 214 of the support member 220 is 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 is shown with two bent terminal surfaces 253 formed thereon. A plurality of terminals 251 are disposed on the terminal surface 253, and external power can be applied to supply current to the first coil 120 and the second coil 230. The number of terminals formed on the terminal surface 253 may increase or decrease depending on the types of components that require control. Additionally, the printed circuit board 250 may be provided with one or three or more terminal surfaces 253.

The cover member 300 may be provided in a substantially box shape, accommodates the movable part 100, the second coil 230, a portion of the printed circuit board 250, etc., and can be combined with the base 210. there is. The cover member 300 protects the movable part 100, the second coil 230, the printed circuit board 250, etc. accommodated therein from damage, and in particular, the first magnet 130 accommodated therein. , leakage of electromagnetic fields generated by the first coil 120, second coil 230, etc. to the outside can be limited and the electromagnetic fields can be focused.

Figure 2 is a perspective view schematically showing a lens driving device according to an embodiment. Figure 3 is a diagram showing part A of Figure 2.

In the embodiment, the lens driving device has 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, as shown in FIGS. 2 and 3. A groove (g1) may be provided.

At this time, the printed circuit board 250 may have at least one terminal surface 253 that is bent, and the first recessed groove g1 may be formed on both upper sides of the terminal surface 253. Additionally, concave portions 253a forming 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 formed by allowing the adhesive to flow into the gap where the printed circuit board 250, the cover member 300, and the base 210 are in contact with each other, thereby forming the gap. It is a structure formed to fill.

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. Additionally, 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 at the area where the printed circuit board 250, cover member 300, and base 210 are in contact is located in the area facing the side of the protrusion, so when the adhesive flows into the first recessed groove g1, the protrusion This is because it flows down toward the cross section and easily penetrates into the gap, making bonding with adhesive easy.

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

Meanwhile, the adhesive used in the above bonding operation may be made of a polymer-based material such as epoxy. When the viscosity of the adhesive is low, the bonding work to fill the gap can be easily performed because the fluidity is high, but the bonding strength may be weakened. On the other hand, in the case of an adhesive with high viscosity, the bonding force is strong, but the fluidity is low, so it may not be easy to proceed with the bonding operation to fill the gap.

Therefore, it may be necessary to proceed with the bonding operation using an adhesive with an appropriate viscosity, taking into account the ease of operation, the bonding strength between the printed circuit board 250, the cover member 300, and the base 210 after the bonding operation. You can.

The width (w) measured along the longitudinal direction of the terminal surface 253 of the first recessed groove (g1) is such that the needle of the adhesive injector that performs the bonding operation can easily be inserted into the first recessed groove (g1). It can be selected by considering whether it can fit into the groove, the ease of forming the first recessed groove g1, the ease of bonding work, etc.

Considering this, it is appropriate for the first depressed groove g1 to be 0.1 mm or more, preferably 0.3 mm or more, and more preferably 0.1 mm to 0.6 mm.

Figure 4 is a diagram for explaining a bonding operation for combining a lens driving device according to an embodiment.

The bonding operation of joining 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 equipped with a needle.

For example, as shown in FIG. 4, the needle of the adhesive injector from which the liquid adhesive is released 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 are injected. A process of bonding the first gap (G1) at the contact portion and the second gap (G2) at the portion where the terminal surface 253, the cover member 300, and the base 210 are in contact with an adhesive may be performed.

As shown in FIG. 4, in the lens driving device provided with the first recessed groove g1 of the embodiment, when bonding work is performed by moving the needle from left to right as above, the first gap G1 is easily moved. Bonding work can be done easily.

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

First, place a needle in the first recessed groove (g1) located in the second gap (G2) on the left side in the drawing and sufficiently inject adhesive into the first recessed groove (g1). The injected adhesive flows into the first recessed groove g1, and the second recessed adhesive is formed at the area 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, the bonding between the terminal surface 253, the cover member 300, and the base 210 has sufficient bonding force, and the second gap G2 Gap G2 can be completely sealed. After the bonding operation on the second gap G2 is completed, the sealing operation on the first gap G1 may be performed.

Next, a bonding operation is performed to fill the first gap (G1) while moving the needle located in the first depressed 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 moving speed of the needle is appropriately adjusted, sufficient bonding force is obtained between the terminal surface 253 and the cover member 300 and the first gap (G1) is formed. can be completely sealed.

Next, place the needle in the first recessed groove (g1) located in the second gap (G2) on the right side in the drawing and proceed with the same bonding operation as performed in the second gap (G2) on the left side in the above drawing. do.

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

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

Figure 5 is a bottom view showing the base 210 according to one embodiment. The base 210 of one embodiment includes the base 210 and the cover member 300 or the printed circuit board 250 on the bottom of the base 210 at a portion that is coupled to the cover member 300 or the printed circuit board 250. A second recessed groove (g2) into 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 by bending 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 the second recessed groove (g2) may be provided at the area where the cover member 300 and the base 210 are joined. there is.

It is necessary to perform bonding work to block the inflow of foreign substances from the outside into the lens driving device. Meanwhile, in the case of a bonding operation in which the gap at the area where the terminal face 253, the base 210, and the cover member 300 are joined to each other is sealed with an adhesive, the work is not easy, especially due to the terminals of the terminal face 253.

That is, when bonding work is performed on the front surface of the terminal surface 253 where the terminals are formed, adhesive may be attached to the terminals. In the case of terminals covered with adhesive, contact failure or malfunction due to poor contact may occur during performance testing of the lens driving device or actual use of the lens driving device after completing the assembly work of the lens driving device including the bonding work.

In addition, when bonding work is performed on the front surface of the terminal surface 253 where the terminal is formed, the needle for applying the adhesive must be moved to the area where the terminal surface 253, the base 210, and the cover member 300 are joined to each other. Since there are many interfering protruding or depressed structures, the bonding operation may not be performed smoothly, and the needle may be damaged or bent during the bonding operation.

Therefore, the embodiment facilitates the bonding process between the terminal surface 253, the base 210, and the cover member 300 by performing the bonding process on the back side, rather than the front side, where the terminals of the terminal surface 253 are formed. It is effective in achieving complete sealing through bonding work.

Meanwhile, the base 210 is formed in a square shape, and the second recessed groove g2 may be provided on each side of the square shape. Additionally, a portion where the cover member 300 or the terminal surface 253 of the printed circuit board 250 is coupled to the base 210 may be provided on each side of the rectangular shape.

The second recessed groove (g2) is formed adjacent to the gap at the area where the terminal surface 253, base 210, and cover member 300 come into contact with each other, and is closed on the inside and open on the outside to communicate with the gap. It can be.

Accordingly, the adhesive is injected into the second recessed groove g2 and then flows into the gap located in the open portion of the second recessed groove g2 to fill the gap, thereby completing the bonding operation. If a sufficient and appropriate amount of adhesive is injected into the second recessed groove g2, the gap can be completely filled and sealed.

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

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

The point application bonding operation in which adhesive is injected into the third recessed groove (g3) is less likely to cause damage to the needle compared to the linear application bonding operation in which the needle is placed at the initial bonding site and the needle is moved along a linear gap. It has the effect of significantly reducing warping.

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

At this time, the fourth recessed groove (g4) may be provided in plurality in areas symmetrical to each other with respect to the center of each side of the base 210 and an imaginary center line passing through the center of the base 210. In Figure 7, a pair of symmetrical fourth recessed grooves g4 are shown, but the present invention is not limited thereto.

That is, the fourth recessed groove g4 may be provided in numbers of four or more in symmetrical areas. In addition, each of the symmetrical fourth recessed grooves g4 is located in a symmetrical area, but their shapes do not need to be symmetrical to each other.

Like the third recessed groove (g3), the fourth recessed groove (g4) may be formed additionally in the second recessed groove (g2), and when adhesive is injected into the fourth recessed groove (g4) during the 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 above, the bonding operation using the point application method in which adhesive is injected into the fourth recessed groove g4 has the effect of significantly reducing damage and bending of the needle compared to the bonding operation using the linear application method described above.

Figure 8 is a bottom view showing the base 210 according to another embodiment. As shown in FIG. 8, the fourth recessed groove (g4) is formed at the edge of the base 210, and the second recessed grooves (g2) adjacent to each other with the edge of the base 210 interposed are the fourth recessed grooves (g4). They can be connected to each other by a recessed groove (g4).

Accordingly, the second recessed grooves g2 formed on the bottom of the base 210 may be connected to each other through the fourth recessed groove g4. In this case, the adhesive flowing into the fourth recessed groove (g4) flows into the second recessed grooves (g2) adjacent to each other with the edge of the base 210 in between, and passes through the second recessed grooves (g2) to the base. It may flow into each of the adjacent gaps with the edge of 210 in between.

Figure 9 is a bottom view showing the base 210 according to another embodiment. As shown in FIG. 9, the second recessed groove g2 includes a third recessed groove g3 recessed toward the center of the base 210 and a fourth recessed groove recessed toward the edge of the base 210. A recessed groove (g4) is formed, and a plurality of fourth recessed grooves (g4) may be provided in symmetrical areas.

In this case, a bonding operation using a point application method in which adhesive is injected into the third recessed groove (g3) and/or the fourth recessed groove (g4) can be performed. Meanwhile, similar to the embodiment described in FIG. 8, a fourth recessed groove (g4) is formed at the edge of the base 210, and second recessed grooves (g2) adjacent to each other with the edge of the base 210 in between are formed. It may also be provided to be connected to each other by the fourth recessed groove (g4).

Figure 10 is a diagram showing the second recessed groove g2. Figure 11 is a schematic diagram showing the 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) extends from the inside of the base 210 to the outside of the base 210, that is, the base 210. ) may be provided at an angle so that the depth becomes deeper as each side of the square shape increases.

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

That is, as shown in FIG. 11, the longest depth L2 of the second recessed groove g2 is formed to be larger than the shortest depth L1 of the fourth recessed groove g4. During the bonding operation, the top of the side surface f5 of the second recessed groove g2 including the fourth recessed groove g4 is disposed horizontal or close to the horizontal, and thus the side surface f5 of the second recessed groove g2 is The lower end maintains the slope, and therefore the bottom of the second recessed groove g2 also maintains the slope.

Therefore, the adhesive p flowing into the fourth recessed groove g4 flows smoothly along the bottom of the inclined second recessed groove g2 and flows into the gap that is the bonding area, thereby filling and sealing the gap.

Meanwhile, 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 formed from the inside to the outside of the base 210 as described above. It can be provided with an inclined structure so that the depth increases as it goes further.

Since each of the recessed grooves formed on the bottom of the base 210 has an inclined structure whose depth increases from the inside to the outside, the adhesive (p) flowing into each recessed groove flows more smoothly and flows into the gap, thereby facilitating the bonding operation. It has the effect of being able to be completed quickly.

Meanwhile, the lens driving device according to the above-described embodiment can be used in various fields, for example, camera modules. For example, camera modules 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 the bottom surface of the camera module from the portion where the image sensor is mounted.

Additionally, 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 an image stabilization function may be installed in the optical system. The actuator module that performs the auto-focusing function can be configured in various ways, and voice coil unit motors are commonly used. The lens driving device according to the above-described embodiment may function as an actuator module that performs both an auto-focusing function and an image stabilization function.

Additionally, the camera module may further include an infrared blocking filter (not shown). The infrared cut-off filter serves to block light in the infrared range from entering the image sensor. In this case, in the base 210 illustrated in FIG. 2, an infrared cut-off filter may be installed at a position corresponding to the image sensor and may be combined with a holder member (not shown). Additionally, 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 form the terminal integrally using surface electrodes, etc. Meanwhile, the base 210 may function as a sensor holder that protects the image sensor. In this case, a protrusion may be formed in the downward direction along the side of the base 210. However, this is not an essential configuration, and although not shown, a separate sensor holder may be placed at the bottom of the base 210 to perform its role.

Although only a few examples 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 can be combined in various forms unless they are incompatible technologies, and through this, can be implemented as a new embodiment.

210: base
210a: Outer surface of the base
250: printed circuit board
253: terminal side
253a: recess
300: Cover member
f1: page 1
f2: side 2
f3: page 3
f5: Side of the second recessed groove
G1: 1st gap
G2: 2nd gap
g1: first depression groove
g2: Second depressed groove
g3: Third depression 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 the optical axis direction; and
Including an adhesive that joins the circuit board and the base,
The circuit board includes a terminal surface disposed on an outer surface of the base,
The base is,
a second recessed groove formed on a side of the bottom of the base and adjacent to the outer surface of the base where the terminal surface is coupled to inject the adhesive; and
A lens driving device comprising a third recessed groove extending from the second recessed groove toward the center of the base. According to paragraph 1,
The base has a square shape,
The terminal surface is bent toward the outer surface of the base and includes a plurality of terminals. According to paragraph 1,
A lens driving device in which a support groove in which the terminal surface of the circuit board is disposed is formed on an outer surface of the base. According to paragraph 1,
A lens driving device comprising an upper plate and a side plate connected to the upper plate, and a cover member accommodating at least a portion of the bobbin and the circuit board. According to paragraph 4,
A gap is formed between the terminal face, the base, and the side plate of the cover member,
A lens driving device in which the second recessed groove is closed on the inside and open on the outside to communicate with the gap. According to clause 5,
A lens driving device wherein a portion of the adhesive injected into the second recessed groove is disposed in the gap. According to paragraph 1,
The base is a lens driving device including a fourth recessed groove extending from the second recessed groove toward an edge of the base. According to paragraph 1,
The base has a square shape,
The second recessed groove includes four second recessed grooves formed on four sides of the bottom surface of the base,
The base is a lens driving device including a fourth recessed groove extending from the second recessed groove toward a corner of the base and connecting the four second recessed grooves to each other. According to paragraph 1,
The second recessed groove is formed to be inclined so as to increase in depth from the inside of the base to the side portion of the bottom surface of the base. According to paragraph 1,
a housing disposed on the circuit board and accommodating the bobbin;
A magnet disposed in the housing; and
A lens driving device including a first coil disposed on the bobbin and moving the bobbin in the optical axis direction by interacting with the magnet. According to clause 10,
an upper elastic member coupled to the upper part of the bobbin and the upper part of the housing;
a second coil that moves the housing by interacting with the magnet; and
A lens driving device including a support member electrically connected to the upper elastic member and the circuit board. According to clause 11,
The second coil is a lens driving device electrically connected to the circuit board. Base;
a circuit board disposed on the base;
a bobbin disposed on the circuit board and moving in the optical axis direction; and
Including an adhesive that joins the circuit board and the base,
The circuit board includes a terminal surface disposed on an outer surface of the base,
The base is,
a second recessed groove formed on a side of the bottom of the base and adjacent to the outer surface of the base where the terminal surface is coupled to inject the adhesive; and
A lens driving device including a fourth recessed groove extending from the second recessed groove toward a corner of the base. Base;
a circuit board disposed on the base;
a bobbin disposed on the circuit board and moving in the optical axis direction; and
Including an adhesive that joins 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 of the base for injecting the adhesive,
The second recessed groove is formed adjacent to the outer surface of the base to which the terminal surface is coupled,
The base has a square shape, and the second recessed groove includes four second recessed grooves formed on four sides of the bottom surface of the base,
The base is a lens driving device including a fourth recessed groove extending from the second recessed groove toward a corner of the base and connecting the four second recessed grooves to each other. Base;
a circuit board disposed on the base;
a bobbin disposed on the circuit board and moving in the optical axis direction; and
Including an adhesive that joins 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 a side of the bottom of the base adjacent to the outer surface of the base to which the terminal surface is coupled to inject the adhesive,
The second recessed groove is formed to be inclined so as to increase in depth from the inside of the base to the side portion of the bottom surface of the base. lens;
A lens driving device according to any one of claims 1 to 15; and
A camera module containing an image sensor.