KR102631963B1 - Lens driving apparatus, and camera module and mobile device including the same - Google Patents

Abstract

One embodiment of the lens driving device includes a bobbin moving in a first direction; A first coil installed on the outer peripheral surface of the bobbin; a housing inside which the bobbin is installed; A first magnet coupled to the housing; an upper elastic member provided on an upper side of the bobbin and coupled to the bobbin and the housing; a circuit member including a second coil disposed below the housing to face the first magnet; a printed circuit board disposed below the circuit member and electrically connected to the circuit member; And it may include a plurality of support members connected to the upper elastic member, and an application expansion area that expands the application area of the adhesive may be formed in a portion of the bobbin where the lens barrel is bonded.

Description

Lens driving apparatus, camera module and mobile device including the same}

Embodiments relate to a lens driving device, a camera module including the same, and a portable device.

The content described in this section simply provides background information on the embodiments and does not constitute prior art.

Mobile phones or smartphones equipped with a camera module that captures a subject and saves it as an image or video are being developed. Generally, a camera module may include a lens, an image sensor module, and a lens driving device that adjusts the distance between the lens and the image sensor module.

Portable devices such as mobile phones, smartphones, tablet PCs, and laptops have ultra-small camera modules built into them. The lens driving device can perform auto focusing to align the focal length of the lens by adjusting the gap between the image sensor and the lens.

In addition, while shooting a subject, the camera module may slightly shake due to the user's hand tremor. To correct distortion of images or videos caused by the user's hand movement, a lens with an optical image stabilization (OIS) function is added. A driving device is being developed.

Accordingly, the embodiment relates to a lens driving device having a robust structure resistant to external shock, a camera module including the same, and a portable device.

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.

One embodiment of the lens driving device includes a bobbin moving in a first direction; A first coil installed on the outer peripheral surface of the bobbin; a housing inside which the bobbin is installed; A first magnet coupled to the housing; an upper elastic member provided on an upper side of the bobbin and coupled to the bobbin and the housing; a circuit member including a second coil disposed below the housing to face the first magnet; a printed circuit board disposed below the circuit member and electrically connected to the circuit member; And it may include a plurality of support members connected to the upper elastic member, and an application expansion area that expands the application area of the adhesive may be formed in a portion of the bobbin where the lens barrel is bonded.

The application expansion area may include an inclined surface inclined with respect to a first direction on an upper portion of the inner peripheral surface of the bobbin.

The inclined surface may be arranged to surround the lens barrel on an x-y plane perpendicular to the first direction.

The application expansion area may include a plurality of recessed grooves formed by recessing a portion of the inclined surface.

The plurality of recessed grooves may be symmetrically provided with respect to the center of the bobbin and may have a set spacing between them.

The application expansion area may include a plurality of bosses, some of which are formed to protrude from the inclined surface.

The plurality of bosses may be provided symmetrically with respect to the center of the bobbin and may have a set spacing between them.

The application expansion area may include a step formed on the inclined surface.

The steps may be provided in plural numbers in the width direction of the inclined surface.

One embodiment of the lens driving device may further include a lower elastic member provided below the bobbin and coupled to the bobbin and the housing.

One embodiment of the lens driving device may further include a base disposed below the printed circuit board.

The support member may be disposed at a corner of the housing to elastically support the housing.

The inclined surface may be formed in a ring shape.

Another embodiment of the lens driving device includes a housing; a bobbin accommodated inside the housing and for mounting a lens; A first coil disposed on the outer peripheral surface of the bobbin; a first magnet disposed on a side of the housing to correspond to the first coil; and a base disposed on the lower side of the housing, and an application expansion area that expands the application area of the adhesive may be formed in a portion of the bobbin where the lens is bonded.

One embodiment of the camera module includes a bobbin moving in a first direction; A first coil installed on the outer peripheral surface of the bobbin; a housing inside which the bobbin is installed; A first magnet coupled to the housing; an upper elastic member provided on an upper side of the bobbin and coupled to the bobbin and the housing; a lower elastic member provided below the bobbin and coupled to the bobbin and the housing; a circuit member including a second coil disposed below the housing to face the first magnet; a printed circuit board disposed below the circuit member and electrically connected to the circuit member; a base disposed below the printed circuit board; A plurality of support members connected to the upper elastic member; and a lens barrel coupled to the bobbin, wherein the bobbin has an application expansion area formed at a portion bonded to the lens barrel to expand the application area of the adhesive, and the application expansion area is formed on an upper portion of the inner peripheral surface of the bobbin. It may include an inclined surface inclined with respect to a first direction, and a plurality of recessed grooves, bosses, or steps may be formed on the inclined surface.

Another embodiment of the camera module may include the lens driving device.

One embodiment of a portable device includes a display module including a plurality of pixels whose colors change by electrical signals; The camera module converts an image incident through a lens into an electrical signal; and a control unit that controls operations of the display module and the camera module.

In an embodiment, the application expansion area forms an inclined surface, and the inclined surface can expand the application area of the adhesive on both the bobbin side and the lens barrel side, and the expansion of the application area causes the adhesive to join the bobbin and the lens barrel. Binding strength can be increased.

In addition, the application expansion area includes a recessed groove, a boss, or a step, so that, together with the inclined surface, the application area of the adhesive can be expanded to increase the bonding force of the adhesive that connects the bobbin and the lens barrel.

In addition, by increasing the bonding force of the adhesive, even when the lens driving device receives continuous and continuous shock from the outside, the adhesive maintains the bonding force and is prevented from falling off, thereby preventing the occurrence of malfunction of the lens driving device.

1 is a perspective view schematically showing a lens driving device of one embodiment.
Figure 2a is an exploded perspective view showing a lens driving device of one embodiment.
Figure 2b is an exploded perspective view showing a lens driving device of an embodiment different from Figure 2a.
Figure 3 is a perspective view showing a bobbin in one embodiment.
Figure 4 is a perspective view showing the housing of one embodiment.
Figure 5 is a perspective view of a bobbin for explaining the application expansion area of one embodiment.
Figure 6 is an enlarged view showing part A of Figure 5.
Figure 7 is a plan view showing a lens driving device of one embodiment.
Figure 8 is a cross-sectional view showing a lens driving device of one embodiment.
Figure 9 is an enlarged view showing part B of Figure 8.
Figure 10 is a perspective view of a bobbin for explaining the application expansion area of another embodiment.
Figure 11 is an enlarged view showing part C of Figure 10.
Figure 12 is a perspective view of a bobbin for explaining the application expansion area of another embodiment.
Figure 13 is an enlarged view showing part D of Figure 12.
Figure 14 is a perspective view of a portable device of one embodiment.
FIG. 15 shows a configuration diagram of the portable device shown in FIG. 14.

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.

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 for the purpose of distinguishing one component from another component. 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 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. .

1 is a perspective view schematically showing a lens driving device of one embodiment. Figure 2a is an exploded perspective view showing a lens driving device of one embodiment.

An autofocusing device applied to a small camera module of a mobile device such as a smartphone or tablet PC is a device that automatically focuses an image of a subject onto an image sensor (not shown). Such an auto-focusing device can be configured in various ways, and in the embodiment, an auto-focusing operation can be performed by moving an optical module composed of a plurality of lenses in a first direction.

As shown in FIG. 2A, the lens driving device according to the embodiment may include a movable part and a fixed part. At this time, the movable part may perform the auto-focusing function of the lens. The movable part may include a bobbin 110 and a first coil 120, and the fixed part may include a first magnet 130, a housing 140, an upper elastic member 150, and a lower elastic member 160. there is.

The bobbin 110 is installed to move in the first direction inside the housing 140, and is provided with a first coil 120 disposed inside the first magnet 130 on the outer peripheral surface, and the first magnet ( 130) and the first coil 120 may be installed in the inner space of the housing 140 to move back and forth in the first direction due to electromagnetic interaction between the first coil 120 and the first coil 120. 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 LB (see FIG. 7) in which at least one lens is installed. The lens barrel LB can be coupled to the inside of the bobbin 110 in various ways.

For example, a female thread is formed on the inner peripheral surface of the bobbin 110, and a male thread corresponding to the thread is formed on the outer peripheral surface of the lens barrel LB, and the lens barrel LB is connected to the bobbin by screwing these. 110).

However, this is not limited, and the lens barrel LB 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 the lens barrel LB. However, in the embodiment, a case where the lens barrel LB and the bobbin 110 are coupled with adhesive will be described.

The lens coupled to the lens barrel LB may be composed of 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 and/or amount of 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 be coupled to and fixed to the upper elastic member 150 by guiding the upper elastic member 150.

The lower support protrusion may be provided in a cylindrical or prismatic shape like the above-described upper support protrusion, and may be coupled to and fixed to the lower elastic member 160 by guiding the lower elastic member 160.

The upper elastic member 150 is provided on the upper side of the bobbin 110, and the lower elastic member 160 is provided on the lower side of the bobbin 110, and may be coupled to the bobbin 110 and the housing 140, respectively. At this time, holes and/or grooves corresponding to the upper support protrusions may be formed in the upper elastic member 150, and holes and/or grooves corresponding to the lower support protrusions may be formed in the lower elastic member 160.

Each of the supporting protrusions and the holes and/or grooves may 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, is formed in a substantially square shape, and may be disposed inside the cover member 300. The first magnet 130 may be coupled and disposed on the side surface of the housing 140.

Additionally, as described above, a bobbin 110 that moves in the first direction may be installed inside the housing 140 while being guided by the upper and lower elastic members 150 and 160.

In an embodiment, the first magnet 130 has a rod shape and may be coupled to or placed on the side of the housing 140. In another embodiment, the first magnet 130 may have a trapezoidal shape and may be coupled to or placed at a corner of the housing 140.

Meanwhile, the first magnet 130 may be provided as one or two or more. Additionally, the first magnet may be provided in a multi-layer structure in which a plurality of magnets are arranged in the first direction.

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, for example, leaf springs.

As shown in FIG. 2A, 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, or can serve as a current transmission path.

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, for example, the fixation work can be completed by bonding using an adhesive after heat fusion fixation.

The base 210 is disposed below the bobbin 110 and the printed circuit board 250, and may be provided in a substantially square shape, on which the printed circuit board 250 may be seated. 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. Additionally, the base 210 may be disposed below the housing 140 and coupled to the cover member 300.

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 at a corner of the housing 140, the upper side is coupled and connected to the upper elastic member 150, and the lower side is connected to the base 210, printed circuit board 250, and circuit member 231. It can be coupled to a substrate including, and support the bobbin 110 and the housing 140 so that they can move in a second and/or third direction perpendicular to the first direction, and the first coil It can be electrically connected to (120).

The support member 220 is disposed at a corner of the housing 140 and can elastically support the housing 140. A plurality of support members 220 may be provided. According to the embodiment, a total of four support members 220 may be installed since each is disposed at a corner of the housing 140, that is, at a corner. The support member 200 may be made of an elastically deformable material so that the bobbin 110 and the housing 140 can move in the x-y plane.

Or, in another embodiment, two may be placed at two corners and one may be placed at the other two corners, for a total of six. Or, in some cases, a total of 7 or more may be placed.

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

In addition, since the support member 220 is formed as a separate member from the upper elastic member 150, the support member 220 and the upper elastic member 150 may be electrically connected through a conductive adhesive, soldering, or welding. You can. Accordingly, the upper elastic member 150 can apply current to the first coil 120 through the electrically connected support member 220.

The lower portion of the support member may be inserted into a hole formed in a substrate including the circuit member 231 and the printed circuit board 250, and may be connected to the substrate by soldering. That is, the support member 220 may be electrically connected to the substrate by inserting its lower portion into a hole formed in the circuit member 231 and/or the printed circuit board 250 and soldering it.

Alternatively, no through hole may be formed in the circuit member 231 and/or the printed circuit board 250, and the support member 220 may be electrically soldered to a corresponding portion of the circuit member 231.

Meanwhile, in FIG. 2A, the linear support member 220 is shown as an example, but the present invention is not limited thereto. That is, the support member 220 may be provided in the form of a plate-shaped member, etc.

The second coil 230 moves the housing 140 in the second and/or third directions through electromagnetic interaction with the first magnet 130, and the support member 220 is elastically deformed, causing hand tremors. Correction can be performed.

Here, the second and third directions may include directions substantially close to the x-axis and y-axis as well as the x-axis (or first direction) and y-axis (or second direction) directions. That is, from the driving aspect of the embodiment, the housing 140 may move parallel to the x-axis and y-axis, but may also move slightly inclined to the x-axis and y-axis when moved while supported by the support member 220. there is.

Therefore, 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. Alternatively, the second coil 230 may be disposed below the housing 140 to face the first magnet 130.

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

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

In the case of the embodiment, a circuit pattern may be formed in the shape of the second coil 230 on the circuit member 231, or a separate second coil may be disposed on the circuit member 231, but the present invention is not limited to this, and the circuit A circuit pattern may be formed in the shape of the second coil 230 directly on the 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 or disposed 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 substrate is disposed between the housing 140 and the base 210 and may include a circuit member 231 and a printed circuit board 250. At this time, the circuit member 231 and the printed circuit board 250 may be electrically connected to each other.

The circuit member 231 may include a second coil 230 disposed to face the first magnet 130 and may be disposed on the printed circuit board 250 .

The printed circuit board 250 is disposed below the circuit member 231, is electrically connected to at least one of the upper elastic member 150 and the lower elastic member 160, and is attached to the upper surface of the base 210. It is coupled, and a through hole into which the support member 220 is inserted may be formed at a position corresponding to the end of the support member 220. Alternatively, the through hole may not be formed and may be electrically connected or bonded to the support member.

In another embodiment, when the support member 220 is coupled to the circuit member 231, the corner portion corresponding to the support member 220 of the printed circuit board 250 includes the support member 220 and the circuit member ( 231) A relief portion may be formed to facilitate joining work, such as soldering.

The printed circuit board 250 is coupled to the upper surface of the base 210 and disposed on the lower side of the circuit member 231, and may be electrically connected to the circuit member 231. A terminal surface 253 may be formed on the printed circuit board 250, which is disposed on the side of the base 210 and on which the terminal 251 is installed. 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 to receive current from an external power source and supply current to the first coil 120 and the second coil 230. The number of terminals 251 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 two or more terminal surfaces 253.

The cover member 300 may be provided in the form of a box with corners formed, and may accommodate part or all of the movable part, the second coil 230, and the printed circuit board 250, and be coupled to the base 210. You can. The cover member 300 can protect the movable part, the second coil 230, the printed circuit board 250, etc. accommodated therein from damage.

In addition, the cover member 300 restricts leakage of electromagnetic fields generated by the first magnet 130, first coil 120, second coil 230, etc. accommodated therein to the outside and focuses the electromagnetic fields. You can do it as well.

Figure 2b is an exploded perspective view showing a lens driving device of an embodiment different from Figure 2a. Compared to FIG. 2A, the lens driving device of the embodiment shown in FIG. 2B may not be provided with the support member 230, the second coil 230, and the circuit member 231.

Accordingly, the lens driving device of the embodiment shown in FIG. 2B may only perform the auto-focusing function without performing the camera shake correction function. Since the remaining components except for the support member 230, the second coil 230, and the circuit member 231 have already been described with reference to FIG. 2A, redundant description will be omitted.

Hereinafter, the structures of the bobbin 110 and the housing 140 will be described in more detail with reference to FIGS. 3 and 4. Figure 3 is a perspective view showing the bobbin 110 of one embodiment.

The bobbin 110 may include a first upper support protrusion 113 and a third protrusion 111. The first upper support protrusion 113 is a portion where the through hole formed in the upper elastic member 150 is joined. The first upper support protrusion 113 may be formed in a cylindrical shape or other various shapes, and may guide the upper elastic member 150 to couple the upper elastic member 150 to the bobbin 110.

The third protrusion 111 may be formed to protrude from the upper surface of the bobbin 110. When an external shock occurs, the upper surface of the third protrusion 111 collides with the lower surface of the cover member 300, thereby preventing plastic deformation exceeding the elastic limit of the spring.

When the initial position of the bobbin 110 is set to a position where the bobbin 110 can no longer descend, auto-focusing of the bobbin 110 can be implemented as one-way control. That is, when the amount of current supplied to the first coil 120 increases, the bobbin 110 rises, and when the amount of current supplied decreases, the bobbin 110 gradually lowers and returns to the initial position. It can be implemented.

However, when the initial position of the bobbin 110 is set to have a separation distance that allows the bobbin 110 to descend, auto focusing of the bobbin 110 can be implemented through bidirectional control. That is, the auto-focusing function can be implemented by moving the bobbin 110 upward or downward in the first direction.

For example, when a forward current is applied, the bobbin 110 may move upward, and when a reverse current is applied, the bobbin 110 may move downward.

Figure 4 is a perspective view showing the housing 140 according to one embodiment. The housing 140 supports the magnet 130 and can accommodate the bobbin 110 moving in the first direction inside.

The housing 140 may have an overall hollow pillar shape. For example, the housing 140 may have a polygonal (eg, square or octagonal) or circular hollow shape.

The housing 140 may include a second upper support protrusion 143 and a fourth protrusion 144. The second upper support protrusion 143 is a portion where the through hole formed in the upper elastic member 150 is joined. The second upper support protrusion 143 may be formed in a cylindrical shape or other various shapes, and may guide the upper elastic member 150 to couple the upper elastic member 150 to the housing 140.

The fourth protrusion 144 may be formed to protrude from the upper surface of the housing 140. The fourth protrusion 144 may serve to stop the bodies of the cover member 300 and the housing 140 from each other. That is, when an external shock occurs, the upper surface of the fourth protrusion 144 collides with the lower surface of the cover member 300, thereby preventing the bodies of the cover member 300 and the housing 140 from directly colliding with each other. .

The housing 140 may be provided with a third recessed portion 148 at a position corresponding to the portion where the first width W1 of the bobbin 110 is formed.

The surface of the third recessed portion 148 of the housing 140 facing the bobbin 110 may have a shape that matches the first width W1, which is a portion protruding from the bobbin 110. At this time, the first width W1 of the bobbin 110 shown in FIG. 3 and the second width W2 of the third recessed portion 148 of the housing 140 shown in FIG. 4 may have a certain tolerance. .

By arranging the third recessed portion 148 to conform to the first width W1 of the bobbin 110, rotation of the bobbin 110 with respect to the housing 140 can be suppressed. Accordingly, even if the bobbin 110 receives a force to rotate about the optical axis or an axis parallel to the optical axis, the third recessed portion 148 of the housing 140 can suppress the rotation of the bobbin 110.

Additionally, a second recessed portion 147 may be formed in a corner portion of the housing 140. The support member 220 may penetrate the second recessed portion 147 in the first direction and be connected to the upper elastic member 150.

The second recessed portions 147 may be provided in pairs at each corner of the housing 140. In an embodiment, the support member 220 may be arranged to penetrate one of a pair of second recessed portions 147 provided in one corner of the housing 140.

In another embodiment, the second recessed portion 147 may be formed only one at a corner of the housing 140. For example, referring to FIG. 6, when viewed on paper, the second depression 147 is formed only on the upper left side through which the support member 220 penetrates among the corners of the housing 140, and is not formed on the lower right side. Maybe not.

In another embodiment, a through hole through which the support member 220 penetrates may be formed in the corner portion of the housing 140 instead of the second recessed portion 147. Like the second recessed portion 147, the through holes may be formed in pairs or one by one at the corners of the housing 140.

Meanwhile, the housing 140 may be provided with a lower support protrusion (not shown) on the lower surface of the corner portion of the housing 140 for coupling to the lower elastic member 160. The lower support protrusion may be provided in a shape corresponding to a position corresponding to the upper support protrusion, but is not limited to this.

The housing 140 may be provided with a plurality of third stoppers 149 protruding from each side. The third stopper 149 may serve to prevent the housing 140 from colliding with the cover member 300 when it moves in the second and third directions.

Figure 5 is a perspective view of the bobbin 110 to explain the application expansion area of one embodiment. Figure 6 is an enlarged view showing part A of Figure 5. As shown in FIGS. 5 and 6, in the lens driving device of the embodiment, an application expansion area may be formed on the bobbin 110.

The lens driving device of the embodiment includes a lens barrel (LB), and the lens barrel (LB) can be coupled to the bobbin 110 with an adhesive.

At this time, the application expansion area may serve to expand the application area of the adhesive to the portion of the bobbin 110 that is bonded to the lens barrel LB.

Referring to FIG. 9, which will be described later, the lens barrel LB has a bonding portion BD where adhesive is applied between the upper inner circumference of the bobbin 110 and the corresponding outer circumference of the lens barrel LB, and the The bobbin 110 and the lens barrel LB may be coupled to each other by the bonding portion BD.

After the adhesive that connects the bobbin 110 and the lens barrel (LB) is hardened, it may be separated from the lens barrel (LB) when subjected to external impact.

For example, when the cured adhesive receives external shock, cracks may partially occur in the adhesive. Due to continuous use of the lens driving device, external shock may be continuously and continuously applied to the cured adhesive.

Cracks in the adhesive grow due to continuous and continuous external shock, and eventually, the adhesive may be separated from the adhesive portion of the bobbin 110 and the lens barrel LB due to the cracks.

If the adhesive comes off, the remaining adhesive may flow into each part of the lens driving device and damage the lens driving device.

A bigger problem is that, as the adhesive comes off, the lens barrel LB may become separated from the bobbin 110 and eventually be damaged to the extent that the lens driving device cannot operate.

In order to prevent this problem from occurring, the adhesive needs to have its adhesive strength strengthened so that it does not fall off even after constant external shock.

In the embodiment, in order to strengthen the adhesive strength of the adhesive connecting the bobbin 110 and the lens barrel LB to the bobbin 110, an application expansion area may be formed on the bobbin 110. As described above, the top coat application expansion area can serve to expand the adhesive application area.

When using the same adhesive, the adhesive strength can increase in proportion to the adhesive application area. Accordingly, the application expansion area may be formed as an inclined surface 710, for example.

That is, as shown in FIGS. 5 and 6, the application expansion area may include an inclined surface 710 inclined with respect to the first direction on an upper portion of the inner peripheral surface of the bobbin 110. At this time, the inclined surface 710 may be formed in an overall ring shape along the inner circumference of the bobbin 110.

Additionally, as shown in FIG. 5, the inclined surface 710 may be arranged to surround the lens barrel LB on the x-y plane perpendicular to the first direction.

If there is no inclined surface 710, most of the adhesive is applied to the top of the inner circumference of the bobbin 110, that is, the upper plane 720, and between the inner circumference of the bobbin 110 and the lens barrel LB. Since the gap is very narrow, the adhesive hardly flows into the inner peripheral surface of the bobbin 110 through the gap.

In the end, most of the adhesive is adhered to the upper plane 720 of the bobbin 110, which is a plane perpendicular to each other, and the outer peripheral surface of the lens barrel LB, so the cured adhesive has a weak bonding force with respect to the bobbin 110 and the lens barrel LB. You can.

In the embodiment, when the inclined surface 710 is formed, adhesive is applied to the upper plane 720 and the inclined surface 710 of the bobbin 110 and the lens barrel corresponding to the height of the inclined surface 710 in the first direction. It can also be applied to the outer peripheral surface of (LB).

Therefore, by forming the inclined surface 710 on the bobbin 110, the upper plane 720 of the bobbin 110, the inclined surface 710, and the lens barrel corresponding to the height of the inclined surface 710 in the first direction Since it is applied to the entire outer peripheral surface of (LB), the application area can be significantly increased compared to the case where the inclined surface 710 is not formed.

Due to this increase in application area, the adhesive strength of the adhesive to the bobbin 110 and the lens barrel LB is significantly increased, and the phenomenon of the adhesive falling off due to external shock can be significantly suppressed.

Meanwhile, as shown in FIGS. 5 and 6, the application expansion area may include a plurality of recessed grooves 711 formed by recessing a portion of the inclined surface 710.

At this time, the depressed groove 711 is, for example, partially formed on the inclined surface 710, and the remainder is formed by recessing the upper plane 720 of the bobbin 110, thereby forming the inclined surface 710 and the upper plane ( 720).

When applying adhesive to the upper plane 720 and the inclined surface 710, the adhesive may flow into the recessed groove 711, thereby increasing the application area of the adhesive on the bobbin 110 side. If the application area on the bobbin 110 side increases due to the depressed groove 711, the bonding force of the adhesive on the bobbin 110 side may increase accordingly.

For example, the plurality of recessed grooves 711 may be provided symmetrically with respect to the center of the bobbin 110 and may be provided at a set distance from each other. The size of the recessed grooves 711, the spacing between the recessed grooves 711, etc. can be appropriately selected in consideration of the overall structure and size of the lens driving device, the bonding force required for the adhesive, etc.

Figure 7 is a plan view showing a lens driving device of one embodiment. Figure 8 is a cross-sectional view showing a lens driving device of one embodiment. Figure 9 is an enlarged view showing part B of Figure 8.

Referring to FIG. 7, when the lens barrel LB is inserted into the inner periphery of the bobbin 110, the inclined surface 710, the upper plane 720, and the plurality of recessed grooves 711 are connected to the lens barrel LB. It can be arranged to surround.

The adhesive is applied and cured to the inclined surface 710, the upper plane 720, the plurality of recessed grooves 711, and the outer peripheral surface of the lens barrel LB corresponding to them, thereby forming the lens barrel LB and the bobbin ( 110) can be combined with each other.

As shown in FIG. 9, the adhesive is bonded to the lens barrel (LB) and the bobbin 110 and hardened to form a bonding portion (BD) that couples the lens barrel (LB) and the bobbin 110 to each other. You can.

At this time, the adhesive forming the bonding portion BD may be, for example, an ultraviolet curing adhesive, an epoxy, or a thermosetting adhesive.

One side of the bonding portion BD may be bonded to the inclined surface 710, upper plane 720, and recessed groove 711 on the bobbin 110 side, and the other side may be bonded to the outer peripheral surface of the adhesive.

In particular, because the inclined surface 710 is formed on the bobbin 110, the bonding portion BD can be easily bonded to the outer peripheral surface of the lens barrel LB corresponding to the height of the inclined surface 710 in the first direction. You can.

That is, the inclined surface 710 expands the application area of the adhesive not only on the bobbin 110 but also on the outer circumferential surface of the lens barrel LB, thereby increasing the area of the bonding portion BD formed by the adhesive on the outer circumferential surface of the lens barrel LB. The adhesive area can be expanded.

By increasing the adhesive area of the bonding portion (BD) on the outer peripheral surface of the lens barrel (LB), the bonding force of the bonding portion (BD) to the lens barrel (LB) can be significantly increased.

Figure 10 is a perspective view of the bobbin 110 to explain the application expansion area of another embodiment. Figure 11 is an enlarged view showing part C of Figure 10.

As shown in FIGS. 10 and 11, the application expansion area may include a plurality of bosses 712, some of which protrude from the inclined surface 710.

At this time, the boss 712 is, for example, partially formed on the inclined surface 710 and the rest is formed by collapsing the upper plane 720 of the bobbin 110, thereby forming the inclined surface 710 and the upper plane 720. ) can be formed over a period of time.

Like the recessed groove 711, the boss 712 can increase the application area of the adhesive. That is, when applying the adhesive to the upper plane 720 and the inclined surface 710, the adhesive is applied to the surface of the boss 712, thereby increasing the adhesive application area on the bobbin 110 side.

If the application area on the bobbin 110 side increases due to the boss 712 formed on the adhesive application area of the bobbin 110, the bonding force of the adhesive on the bobbin 110 side may increase accordingly.

Meanwhile, the plurality of bosses 712 may, for example, be provided symmetrically with respect to the center of the bobbin 110 and may be provided at a set distance from each other. The size of the boss 712, the spacing between the bosses 712, etc. can be appropriately selected in consideration of the overall structure and size of the lens driving device, the bonding force required for the adhesive, etc.

Figure 12 is a perspective view of the bobbin 110 to explain the application expansion area of another embodiment. Figure 13 is an enlarged view showing part D of Figure 12.

As shown in FIGS. 12 and 13, the application expansion area may include a step 713 formed on the inclined surface 710. For example, the steps 713 may be provided in plurality in the width direction of the inclined surface 710.

Like the recessed groove 711 or the boss 712, the plurality of steps 713 can increase the application area of the adhesive.

That is, when applying the adhesive to the inclined surface 710 where the step 713 is formed, the adhesive is applied to the vertical and horizontal surfaces of the step 713, thereby increasing the application area of the adhesive on the bobbin 110 side. there is.

As described above, a plurality of steps 713 may be provided in the width direction of the inclined surface 710, and the number and width of the steps 713 are required for the overall structure, size, and adhesive of the lens driving device. It can be appropriately selected considering the binding force, etc.

In an embodiment, the application expansion area forms an inclined surface 710, and the inclined surface 710 can expand the adhesive application area on both the bobbin 110 side and the lens barrel LB side, and the application area is Due to the expansion, the bonding force of the adhesive that joins the bobbin 110 and the lens barrel (LB) can be increased.

In addition, the application expansion area includes a recessed groove 711, a boss 712, or a step 713, thereby expanding the application area of the adhesive along with the inclined surface 710 to the bobbin 110 and the lens barrel (LB). ) can increase the bonding strength of the adhesive that binds them together.

In addition, by increasing the bonding force of the adhesive, even when the lens driving device receives continuous and continuous shock from the outside, the adhesive maintains the bonding force and is prevented from falling off, thereby suppressing the occurrence of malfunction of the lens driving device.

Meanwhile, the lens driving device according to the above-described embodiment can be used in various fields, such as 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 (LB) coupled to the bobbin 110 and an image sensor (not shown). At this time, the lens barrel LB may include at least one lens that transmits an image to the image sensor.

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. 2A, 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 holder member may support the lower side of the base 210.

A separate terminal member may be installed on the base 210 to conduct electricity with the printed circuit board 250, and it is also possible to form the terminal integrally using surface electrodes, etc. Additionally, if the lens driving device includes a separate board, there may be no separate terminal member.

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.

Figure 14 is a perspective view of a portable device 200A of one embodiment. FIG. 15 shows a configuration diagram of the portable device 200A shown in FIG. 14.

14 and 15, the portable device 200A (hereinafter referred to as “device”) includes a body 850, a wireless communication unit 710, an A/V input unit 720, a sensing unit 740, and an input/output unit 720. It may include an output unit 750, a memory unit 760, an interface unit 770, a control unit 780, and a power supply unit 790.

Various electronic components of the device may be built into the space formed between the front case 851 and the rear case 852 of the body 850.

The wireless communication unit 710 may include, for example, a broadcast reception module 711, a mobile communication module 712, a wireless Internet module 713, a short-range communication module 714, and a location information module 715. there is.

The A/V (Audio/Video) input unit 720 is for inputting audio or video signals and may include a camera 721 and a microphone 722.

The camera 721 may be a camera including the lens driving device 100 according to the embodiment.

The sensing unit 740 monitors the current state of the device 200A, such as the open/closed state of the device 200A, the location of the device 200A, presence or absence of user contact, the orientation of the device 200A, acceleration/deceleration of the device 200A, etc. It is possible to detect and generate a sensing signal to control the operation of the device 200A. In addition, it is responsible for sensing functions related to whether the power supply unit 790 supplies power and whether the interface unit 770 is connected to an external device.

The input/output unit 750 is for generating input or output related to vision, hearing, or tactile sensation. The input/output unit 750 may generate input data for controlling the operation of the device 200A and may also display information processed by the device 200A.

The input/output unit 750 may include a key pad unit 730, a display module 751, a sound output module 752, and a touch screen panel 753. The key pad unit 730 can generate input data through key pad input.

The display module 751 may include a plurality of pixels whose colors change according to electrical signals.

The audio output module 752 outputs audio data received from the wireless communication unit 710 in call signal reception, call mode, recording mode, voice recognition mode, or broadcast reception mode, or stored in the memory unit 760. Audio data can be output.

The touch screen panel 753 can convert the change in capacitance that occurs due to the user's touch to a specific area of the touch screen into an electrical input signal.

The memory unit 760 may store programs for processing and control of the control unit 780, input/output data, images captured by the camera 721, etc.

The interface unit 770 receives data from an external device, receives power and transmits it to each component inside the device 200A, or transmits data inside the device 200A to an external device. The controller 780 may control the overall operation of the device 200A. The control unit 780 may include the panel control unit 144 of the touch screen panel driver shown in FIG. 1 or may perform the function of the panel control unit 144.

The control unit 780 may be equipped with a multimedia module 781 for multimedia playback. The control unit 780 can perform pattern recognition processing to recognize handwriting or drawing input on the touch screen as text and images, respectively.

The power supply unit 790 can receive external power or internal power under the control of the control unit 780 and supply power necessary for the operation of each component.

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.

110: bobbin
120: first coil
130: First magnet
140: housing
150: Upper elastic member
160: Lower elastic member
210: base
220: Support member
230: second coil
231: Circuit member
250: printed circuit board

Claims (17)

housing;
a bobbin disposed within the housing;
A first magnet disposed in the housing; and
A first coil is disposed on the outer peripheral surface of the bobbin and moves the bobbin in a direction parallel to the optical axis by interaction with the first magnet,
The bobbin is formed on an inner peripheral surface of the bobbin and includes an inclined surface for placing an adhesive,
The inclined surface is located at the top of the inner peripheral surface of the bobbin,
The bobbin is a lens driving device including a portion where the distance between the inclined surface and the optical axis increases from the lower surface of the bobbin to the upper surface of the bobbin. According to paragraph 1,
an upper elastic member disposed above the bobbin and coupled to the bobbin and the housing;
a circuit member including a second coil disposed on the lower side of the housing to face the first magnet;
a printed circuit board disposed below the circuit member and electrically connected to the circuit member; and
A lens driving device including a support member connected to the upper elastic member. According to paragraph 1,
A lens driving device wherein the inclined surface has a ring shape along the inner peripheral surface of the bobbin. According to paragraph 1,
The bobbin is a lens driving device including a plurality of recessed grooves formed by recessing a portion of the inclined surface of the bobbin. According to paragraph 4,
The plurality of depressed grooves are,
A lens driving device that is symmetrically provided with respect to the center of the bobbin and has a set spacing between them. According to paragraph 1,
The bobbin is a lens driving device including a plurality of bosses protruding from the inclined surface of the bobbin. According to clause 6,
A lens driving device wherein the plurality of bosses are symmetrically arranged with respect to the center of the bobbin and have a set distance from each other. According to paragraph 1,
The bobbin includes a step formed on the inclined surface of the bobbin,
A lens driving device in which a plurality of steps are formed in the width direction of the inclined surface of the bobbin. According to paragraph 2,
a lower elastic member disposed below the bobbin and coupled to the bobbin and the housing; and
A lens driving device including a base disposed below the printed circuit board. housing;
a bobbin disposed within the housing;
a lens barrel disposed inside the bobbin;
A first magnet disposed in the housing;
a first coil disposed on the outer peripheral surface of the bobbin and moving the bobbin in a direction parallel to the optical axis by interaction with the first magnet; and
Includes an adhesive that joins the bobbin and the lens barrel,
The bobbin includes an inclined surface formed on an inner peripheral surface of the bobbin facing an outer peripheral surface of the lens barrel,
The inclined surface is located at the top of the inner peripheral surface of the bobbin,
A camera module wherein a portion of the adhesive is disposed on the inclined surface of the bobbin and the outer peripheral surface of the lens barrel. According to clause 10,
A camera module in which the separation distance between the inclined surface and the optical axis increases in the direction from the lower surface of the bobbin to the upper surface of the bobbin. According to clause 10,
Another part of the adhesive is a camera module disposed on the upper surface of the bobbin in contact with the inclined surface of the bobbin. According to clause 10,
The bobbin includes a recessed groove formed by recessing a portion of the inclined surface,
Another part of the adhesive is a camera module disposed in the recessed groove. According to clause 10,
The bobbin includes a boss protruding from the inclined surface,
Another portion of the adhesive is placed on the surface of the boss. According to clause 10,
The bobbin includes a step formed on the inclined surface,
Another part of the adhesive is a camera module disposed on the step. According to clause 10,
an upper elastic member coupled to the bobbin and the housing;
a second coil disposed on the lower side of the housing to face the first magnet;
a circuit board disposed below the second coil and electrically connected to the second coil; and
A camera module including a support member connected to the upper elastic member. According to clause 10,
The outer peripheral surface of the lens barrel includes a first surface, a second surface located closer to the inner peripheral surface of the bobbin than the first surface, and an inclined surface connecting the first surface and the second surface and extending in a direction perpendicular to the optical axis. It includes a third side that overlaps with
A camera module wherein another portion of the adhesive is disposed on the third side of the lens barrel.

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