KR102617335B1 - Lens moving unit and camera module including the same - Google Patents

Abstract

The present invention provides a lens unit including at least one lens, a lens driving unit that drives the lens unit to move in a first direction and second and third directions orthogonal to the first direction, and a space in which the lens driving unit is accommodated. It includes a holder providing a holder, an image sensor that converts light incident from the lens unit into an electrical signal, and a substrate portion on which the image sensor is disposed, wherein the holder further includes a holder step portion, and the substrate portion and the holder step portion are at least It relates to a lens driving device characterized by surface contact on two or more surfaces.

Description

Lens moving unit and camera module including the same}

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

Since it is difficult to apply the voice coil motor (VCM) technology used in existing general camera modules to camera modules for ultra-small size and low power consumption, related research has been actively conducted.

In the case of camera modules mounted on small electronic products such as smartphones, the camera module may frequently receive shock during use, and the camera module may slightly shake due to the user's hand tremors during filming. In consideration of this, there has recently been a demand for the development of technology for additionally installing a camera module to prevent shaking.

In general, a lens driving device and a camera module including the same are provided with a cover member having a predetermined height on the upper surface of the substrate, and a bobbin that is movable in a predetermined direction and includes a plurality of lenses is provided inside the cover member. You can.

Recently, various studies are being conducted to miniaturize camera modules. More specifically, research is being actively conducted to reduce the height of camera modules.

The height of the camera module must be greater than a certain length to include a plurality of lenses, a cover member to accommodate the bobbin, and a plurality of stacked lenses arranged inside the bobbin to accommodate the above-mentioned bobbin and cover member. It is determined by the height of the substrate that transmits the collected light to the control unit.

In order to lower the height of the camera module, the thickness of the substrate can be made thinner than before.

When the substrate portion is provided with a predetermined thickness or less, the support structure of the substrate portion becomes unstable, causing a tilting problem of the cover member and bobbin placed on top of the substrate portion, thereby deteriorating the quality of the camera module.

In addition, when the substrate was provided with a predetermined thickness or less, warpage occurred in the substrate, causing a problem in which the resolution of the camera module deteriorated.

A lens driving device and a camera module including the same according to an embodiment have a problem of providing a lens driving device and a camera module including the same, which have a height lower than that of a conventional lens driving device and a camera module including the same. do.

In addition, in the lens driving device and the camera module including the same according to the embodiment, when the substrate portion is provided with a thickness below a predetermined thickness in order to lower the height of the lens driving device and the camera module including the same, the support structure of the substrate portion becomes unstable and the substrate The problem to be solved is to provide a lens driving device and a camera module including the same that improve the quality of the camera module by preventing the problem of the cover member and bobbin disposed on the upper part of the camera being tilted.

In addition, the lens driving device and the camera module including the same according to the embodiment include a lens driving device that improves the resolution of the camera module by preventing bending of the substrate when the substrate is provided with a predetermined thickness or less. The problem to be solved is to provide a camera module that

In order to solve the above-described problem, a lens driving device according to an embodiment includes a lens unit including at least one lens, the lens unit being movable in a first direction and in second and third directions orthogonal to the first direction. It includes a lens driving unit that drives the lens driving unit, a holder that provides a space for accommodating the lens driving unit, an image sensor that converts light incident from the lens unit into an electrical signal, and a substrate unit on which the image sensor is placed, wherein the holder has a holder step portion. Further comprising: providing a lens driving device characterized in that the substrate portion and the holder step portion are in surface contact on at least two surfaces.

In addition, the substrate unit is a lens driving device including a first substrate portion, a second substrate portion disposed on the upper surface of the first substrate portion and on which the image sensor is mounted, and a third substrate portion disposed on the lower surface of the first substrate portion. is provided as a means of solving the problem.

In addition, the first substrate portion is provided with a length longer than the second substrate portion, and the holder step portion is provided to make surface contact with the upper surface of the first substrate portion as a means of solving the problem.

In addition, as a means of solving the problem, the holder step portion provides a lens driving device provided to make surface contact with one side of the second substrate portion.

In addition, the first substrate unit provides a lens driving device that is a flexible printed circuit board as a means of solving the problem.

In addition, the second substrate portion includes a first substrate layer, a second substrate layer disposed on a lower surface of the first substrate layer, and a third substrate layer disposed on a lower surface of the second substrate layer, and the holder step. The purpose of solving the problem is to provide a lens driving device provided to make surface contact with at least one of the first substrate layer, the second substrate layer, and the third substrate layer.

In addition, the second substrate unit provides a lens driving device including a first substrate layer in surface contact with the inner surface of the holder step portion and a second substrate layer in surface contact with the outer side of the holder step portion. Do it as

In addition, the first substrate layer and the second substrate layer provide a lens driving device provided at the same latitude of the substrate portion as a means of solving the problem.

In addition, the first substrate layer and the second substrate layer provide a lens driving device including a chamfering portion as a means of solving the problem.

In addition, a bobbin with at least one lens installed on the inside and a first coil installed on the outer peripheral surface, a cover member providing a receiving space for accommodating the bobbin, and a first coil disposed around the bobbin to face the first coil. A magnet, a housing supporting the first magnet, and upper and lower elastic members coupled to the bobbin and the housing, the bobbin being parallel to the optical axis by the interaction of the first magnet and the first coil. a first lens driving unit moving in a direction, a base disposed at a predetermined distance from the first lens driving unit, and supporting the housing to be movable in second and third directions perpendicular to the first direction with respect to the base. Including a plurality of support members, a second coil disposed opposite to the first magnet, and a circuit board disposed on one surface of the base by an adhesive member, by interaction of the first magnet and the second coil. It includes a second lens driving unit that moves the housing in the second and third directions, an image sensor, and a substrate portion disposed on a lower surface of the holder, wherein the holder is positioned at a predetermined height in a direction parallel to the first direction. A solution to the problem is to provide a lens driving device that includes a holder step portion provided to protrude, and wherein the substrate portion includes a holder groove that provides a space for accommodating the holder step portion.

In addition, the holder groove provides a lens driving device including a chamfering portion as a means of solving the problem.

In addition, providing a lens driving device in which the chamfering portion has a curved surface with a convex shape is provided as a means of solving the problem.

In addition, a means of solving the problem is to provide a camera module including a lens driving device and a printed circuit board on which the image sensor is mounted.

The effect of the invention is to provide a lens driving device and a camera module including the same according to an embodiment, which have a height lower than that of a conventional lens driving device and a camera module including the same. .

In addition, in the lens driving device and the camera module including the same according to the embodiment, when the substrate portion is provided with a thickness below a predetermined thickness in order to lower the height of the lens driving device and the camera module including the same, the support structure of the substrate portion becomes unstable and the substrate The effect of the invention is to provide a lens driving device and a camera module including the same that improve the quality of the camera module by preventing the problem of tilting of the cover member and bobbin disposed on the upper part of the unit.

In addition, the lens driving device and the camera module including the same according to the embodiment include a lens driving device that improves the resolution of the camera module by preventing bending of the substrate when the substrate is provided with a predetermined thickness or less. The effect of the invention is to provide a camera module that does the following.

Figure 1 is an exploded perspective view schematically showing a camera module according to an embodiment.
Figures 2(a) and 2(b) show the assembled lens barrel assembly, sensor base, and substrate according to one embodiment.
Figure 3 is a perspective view schematically showing a lens driving device according to an embodiment.
Figure 4 is an exploded perspective view showing a lens driving device according to an embodiment.
Figure 5 shows a base, a printed circuit board, and a second coil according to one embodiment.
FIG. 6 illustrates a second coil, a circuit board, and a base of a lens driving device according to an embodiment.
Figure 7 shows a bobbin including a printed circuit board, a cover member, an image sensor, and a lens barrel according to an embodiment.
Figure 8 shows the coupling relationship between the cover member and the printed circuit board by enlarging A shown in Figure 7.
Figure 9 is another embodiment showing various coupling relationships between the cover member and the printed circuit board according to the embodiment.

Hereinafter, the present invention will be described with reference to embodiments to specifically explain the present invention, and will be described in detail with reference to the accompanying drawings to aid understanding of the invention. However, the embodiments according to the present invention may be modified into various other forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. Embodiments of the present invention are provided to more completely explain the present invention to those with average knowledge in the art.

In the description of the embodiment according to the present invention, in the case where each element is described as being formed "on or under", the (on or under) includes both that two elements are in direct contact with each other or that one or more other elements 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 “first” and “second,” “upper/upper/above” and “lower/lower/bottom” used below refer to any physical or logical relationship or relationship between such entities or elements. It may be used solely to distinguish one entity or element from another, without necessarily requiring or implying order.

In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Additionally, the size of each component does not entirely reflect the actual size.

Hereinafter, a lens driving device according to an embodiment will be described as follows with reference to the attached drawings. For convenience of explanation, the lens driving device according to the embodiment is described using a Cartesian coordinate system (x, y, z), but it can also be described using another coordinate system, and the embodiment is not limited thereto. In each drawing, the x-axis and y-axis refer to directions perpendicular to the z-axis, which is the optical axis direction. The z-axis direction, which is the optical axis direction, is called the 'first direction', the x-axis direction is called the 'second direction', and the y The axial direction may be referred to as the 'third direction'.

An 'image stabilization device' applied to small camera modules of mobile devices such as smartphones or tablet PCs is a device that prevents the outline of the captured image from being clearly formed due to vibration caused by the user's hand shaking when shooting still images. It may refer to a device configured to do so.

Additionally, an 'autofocusing device' is a device that automatically focuses an image of a subject onto the image sensor surface. Such image stabilization devices and auto-focusing devices can be configured in various ways. The lens driving device according to the embodiment moves the optical module composed of at least one lens in a first direction parallel to the optical axis, or moves the optical module composed of at least one lens in a first direction parallel to the optical axis. An image stabilization operation and/or an auto-focusing operation may be performed by moving about a surface formed by the second and third directions perpendicular to the .

Figure 1 is an exploded perspective view schematically showing a camera module according to an embodiment.

Referring to FIG. 1, the camera module according to the embodiment provides a bobbin 110 including a lens barrel on which a plurality of lenses are stacked, a receiving space for accommodating the bobbin 110, and a space to accommodate the bobbin 110. A holder 300 is provided, a sensor base 400 is provided on the lower surface of the holder 300 and supports the lower surface of the holder 300, and is disposed on one surface of the sensor base 400 and is incident on the bobbin 110. An image sensor 500 that converts light into an electrical signal, a substrate section that provides a space where the image sensor 500 is placed, and is equipped to transmit and convert the electrical signal converted by the image sensor 500 to a control unit (not shown). It may include (600).

The sensor base 400 may be provided between the lower surface of the holder 300 and the upper surface of the substrate portion 600.

More specifically, the sensor base 400 may be attached to the lower surface of the holder 300 so that the sensor base 400 and the holder 300 are coupled, and the sensor base 400 and the holder 300 are coupled. It can be assembled to be seated on the upper surface of the substrate portion 600 in the assembled state.

However, this shows one embodiment and the user can create the sensor base 400 and directly connect the holder 300 and the substrate 600 as needed, and this does not limit the scope of the present invention. .

The sensor base 400 may be provided to further include a filter unit 410 at the center.

The sensor base 400 may be optically provided in a hollow shape. This is to allow the lens barrel to collect light from the outside and transmit the light to the image sensor 500 through the sensor base 400.

That is, the light collected from the outside by the lens barrel is provided to pass through the center of the sensor base 400. At this time, the filter unit 410 is placed in the center of the sensor base 400 to distinguish only the light in the required wavelength range and use the image sensor ( 500).

The filter unit 410 in one embodiment may be an infrared cut off filter.

An infrared cut-off filter refers to the external light collected by the lens barrel containing an infrared region in a wavelength band that cannot be seen by humans. The image sensor 500 recognizes this infrared region as light, distorting it into colors different from reality. It is a member that blocks light in the infrared wavelength range to prevent this.

However, the filter unit 410 of the embodiment may be provided as a filter that blocks wavelengths other than those in the infrared region, if necessary, and does not limit the scope of the present invention.

The substrate unit 600 receives signals received from the substrate base 610, which provides a surface on which the bobbin 110, holder 300, sensor base 400, and image sensor 500 are placed. The connector portion 650 is transmitted to the control unit (not shown) and one end is provided to be electrically connected to the substrate base 610, and the other end is provided to be electrically connected to the connector portion 650 to generate the generated energy in the substrate base 610. It may include a connection board 630 provided to transmit electrical signals to the connector part 650.

The connection board 630 may be provided as a flexible printed circuit board (FPCB).

When the connection board 630 is provided as a flexible board, unlike existing printed circuit boards, it is provided so that it can bend freely, which has the effect of using limited space more efficiently.

However, this is a description of one embodiment, and depending on the user's needs, the connection board 630 may be provided as a general printed circuit board rather than a flexible board, and does not limit the scope of the present invention.

Figures 2(a) and 2(b) show the assembled lens barrel assembly, sensor base, and substrate according to one embodiment.

2(a) and 2(b), a sensor base 400, an image sensor (not shown), and a bobbin 110 are accommodated on the upper surface of the substrate base 610 of the substrate unit 600. The holders 300 may be provided to be stacked sequentially.

The substrate base 610 may include a plurality of terminal portions 611 that electrically connect the substrate 600 and the image sensor 500 to at least one surface where the substrate base 610 and the holder 300 are in contact. .

The terminal portion 611 includes a first terminal portion 6111 provided along the first surface of the lower surface of the holder 300, and a second terminal portion provided along the second surface facing the first surface of the lower surface of the holder 300 ( 6113).

In addition, epoxy 700 is applied to the third surface adjacent to the first surface of the lower surface of the holder 300 where the first terminal portion 6111 is disposed and the fourth surface facing the third surface of the lower surface of the holder 300. It can be included.

That is, the epoxy 700 can be placed on the lower surface of the holder 300 where the terminal part 611 is not provided. This is because the volume increases when the epoxy 700 is placed on the top of the terminal part 611, so to prevent this. It is for this purpose.

However, the epoxy 700 and the terminal 611 can be placed in different positions depending on the user's needs. The image sensor 500 and the substrate 600 are electrically connected through the terminal 611, and the epoxy 700 It is sufficient as long as the holder 300 and the sensor base 400 are provided to be physically coupled through ) and does not limit the scope of the present invention.

FIG. 3 shows a schematic perspective view of a lens driving device according to an embodiment, and FIG. 4 shows an exploded perspective view of the lens driving device illustrated in FIG. 3.

Referring to FIG. 3 , a lens driving device according to an embodiment may include a first lens driving unit (not shown), a second lens driving unit (not shown), and a cover member 300. Here, the first lens driving unit 100 may function as the auto-focusing device described above, and the second lens driving unit 200 may perform the role of the image stabilization device described above.

The cover member 300 may be provided in a substantially box shape and may surround the first and second lens driving units (not shown).

As shown in FIG. 4, the lens driving device according to the embodiment may include a movable part. At this time, the movable part may perform the functions of auto-focusing and image stabilization of the lens. The movable part may include a bobbin 110, a first coil 120, a first magnet 130, a housing 140, an upper elastic member 150, and a lower elastic member 160.

The bobbin 110 is provided with a first coil 120 disposed inside the first magnet 130 on 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.

The upper elastic member 150 may be provided on the upper side of the bobbin 110, and the lower elastic member 160 may be provided on the lower side of the bobbin 110. 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 110 that is guided by elastic members 150 and 160 and moves in the first direction may be disposed inside the housing 140. In an embodiment, the first magnet 130 may be 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. 2, 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, 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 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 FIG. 4, 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 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.

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 second coil 230 may be disposed above the base 210 and below the housing 140. At this time, 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. 4, 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 having 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. 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 holder 300 may be provided in a substantially box shape, accommodate the above-described movable part, the second coil 230, a portion of the printed circuit board 250, etc., and may be coupled to the base 210. The holder 300 protects the movable part, the second coil 230, the printed circuit board 250, etc. accommodated therein from damage, and in particular, the first magnet 130 and the first coil accommodated therein. (120), leakage of the electromagnetic field generated by the second coil 230, etc. to the outside can be limited and the electromagnetic field can be focused.

Figure 5 is an exploded perspective view showing the base 210, the printed circuit board 250, and the second coil 230 according to one embodiment. The lens driving device may further include a position detection sensor (240).

The position sensor 240 is disposed at the center of the second coil 230 and can detect the movement of the housing 140. At this time, the position sensor 240 can basically detect movement of the housing 140 in the first direction, and in some cases, may be provided to detect movement of the housing 140 in the second and third directions. .

The position sensor 240 may be provided as a Hall sensor, or any other sensor that can detect changes in magnetic force can be used. As shown in FIG. 5, a total of two position sensors 240 may be installed at the corners of the base 210 disposed on the lower side of the printed circuit board 250, and the mounted position sensors 240 ) can be inserted and placed into the position sensor seating groove 215 formed on the base 210. The lower surface of the printed circuit board 240 may be opposite to the surface on which the second coil 230 is disposed.

Meanwhile, the position sensor 240 may be disposed at a certain distance apart from the lower side of the second coil 230 with the printed circuit board 250 in between. That is, the position sensor 240 is not directly connected to the second coil 230, and based on the printed circuit board 250, the second coil 230 is located on the upper surface and the position sensor is located on the lower surface ( 240) can be installed.

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 and an image sensor (not shown) combined with the bobbin 110. At this time, the lens barrel 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. 3, 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.

In addition, an adhesive member 211 for adhering the printed circuit board 250 to the base 210 may be further included.

The adhesive member 211 may be provided on one side of the base 210, and as shown in the drawing, may be provided at a position where one side of the base 210 and one side of the printed circuit board 250 are in surface contact. You can.

In this embodiment, the adhesive member 211 is shown as being provided on one side of the base 210, but the adhesive member 211 may be further provided on a side opposite to the surface provided with the adhesive member 211.

The adhesive member 211 shown in this embodiment shows one embodiment, and it is sufficient to simply adhere the printed circuit board 250 to the base 210, and the location and number of adhesive members 211 are provided. There is no limitation on the scope of the present invention.

The base 210 may further include a step portion in the seating groove 214 of the spring unit (not shown).

In order to bond the base 210 and the printed circuit board 250 to each other, an adhesive member 211 may be provided on one side of the base 210. If the amount of the adhesive member 211 is small, the base 210 and the printed circuit board 250 may be attached to each other. The adhesive strength of the circuit board 250 may decrease, which may cause the printed circuit board 250 to lift from the base 210. If the amount of the adhesive member 211 is large, the adhesive member 211 may be attached to the seating groove 214. ) invades, making it difficult to accurately couple the spring unit (not shown) to the attachment groove 214.

Therefore, by further providing a step portion in the seating groove 214 of the base 210, it is possible to prevent the adhesive member 211 from invading the seating groove 214.

The stepped portion is formed by at least one side portion 2143 forming the side of the stepped portion, a lower surface portion 2142 forming the lower surface of the stepped portion, and the side portion 2143 and the lower surface portion 2142 to accommodate the adhesive member 211. It may include a step space 2141.

The cross section of the lower surface portion 2142 of the step space 2141 may be provided in a planar shape.

Additionally, the cross section of the lower surface portion 2142 of the step space 2141 may be provided in a convex shape toward a first direction perpendicular to the lower surface portion 2142.

Since the cross section of the lower surface portion 2142 of the step space 2141 is provided in a convex shape toward the first direction perpendicular to the lower surface portion 2142, the adhesive members 211 are gathered toward both sides of the lower surface portion 2142. There is an effect of more effectively preventing the adhesive member 211 from flowing into the seating groove 214.

Additionally, the cross section of the lower surface portion 2142 of the step space 2141 may be provided in a concave shape toward a first direction perpendicular to the lower surface portion 2142.

Since the cross section of the lower surface portion 2142 of the step space 2141 is provided in a concave shape toward the first direction perpendicular to the lower surface portion 2142, the adhesive members 211 are gathered toward the center of the lower surface portion 2142. There is an effect of more effectively preventing the adhesive member 211 from flowing into the seating groove 214.

Additionally, the cross section of the lower surface portion 2142 of the step space 2141 may be provided in a sinusoidal shape.

Since the cross section of the lower surface portion 2142 of the step space 2141 is provided in a sinusoidal shape, the adhesive member 211 is gathered in a plurality of concave portions formed in the lower surface portion 2142, thereby forming the adhesive member 211. There is an effect of more effectively preventing the inflow into the seating groove 214.

Additionally, in this embodiment, one step portion is shown, but a plurality of step portions may be provided.

Since a plurality of step portions are provided, a space is created to accommodate the adhesive member 211 in double or triple or more layers, which can more effectively prevent the adhesive member 211 from flowing into the seating groove 214. It works.

The lower surface portion 2142 may further include a plurality of protruding members 2144.

A plurality of protruding members 2144 may be provided to protrude upward from the lower surface portion 2142 at a predetermined height.

By providing a plurality of protruding members 2144 on the lower surface portion 2142, the resistance to the flow of the adhesive member 211 introduced into the step portion is increased, so the adhesive member 211 introduced into the step portion is a seating groove ( 214) can be prevented more efficiently.

In the drawing, the plurality of protruding members 2144 are shown to be provided in a hemispherical shape, but this is only an example, and the protruding members 2144 may be provided in a cone shape or a polygonal shape.

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.

FIG. 6 illustrates a second coil, a circuit board, and a base of a lens driving device according to an embodiment.

Meanwhile, referring to FIG. 6 , the second coil 230 may include a fifth through hole 230a penetrating a corner portion of the circuit member 231. The support member 220 may be connected to the circuit board 250 through the fifth through hole 230a. Alternatively, when the second coil 230 is in the form of an FP coil, an Optical Image Stabilizer (OIS) coil 232 may be formed or disposed in a partial area of the FP coil. Additionally, the fifth through hole 230a may not be formed in a portion of the second coil 230 where the fifth through hole 230a is formed, and the support member 220 may be electrically soldered to this portion.

Figure 7 shows a bobbin including a printed circuit board, a cover member, an image sensor, and a lens barrel according to an embodiment, and Figure 8 shows the coupling relationship between the cover member and the printed circuit board by enlarging A shown in Figure 7. It is shown.

Referring to FIGS. 7 and 8, the lens driving device according to the embodiment includes a bobbin 110 accommodating a plurality of lenses that collect external light, a holder 300 providing a space for accommodating the bobbin 110, and A substrate portion 600 provided to support the holder 300, a cover base 400 provided inside the holder 300, and a plurality of devices disposed on one side of the substrate portion 600 and accommodated inside the bobbin 110. It may include an image sensor 500 that changes light collected by the lens into an electrical signal.

The holder 300 may be provided as a member that serves as a holder for accommodating the bobbin 110, or may be formed integrally with the bobbin 110 and provided as an actuator (not shown).

As shown in the drawing, the holder 300 may include a holder step portion 300A to accommodate the cover base 400 and the image sensor 500 therein.

However, in this embodiment, for convenience of explanation, the case where the holder 300 is provided as a separate member to accommodate the bobbin 110 will be described.

The substrate portion 600 includes a first substrate portion 600-1, a second substrate portion 600-2 disposed on the upper surface of the first substrate portion 600-1, and the first substrate portion 600. It may include a third substrate portion 600-3 disposed on the lower surface of -1).

The first substrate portion 600-1, the second substrate portion 600-2, and the third substrate portion 600-3 may include a plurality of layers, and the first substrate portion 600-1 ), at least one of the second substrate portion 600-2 and the third substrate portion 600-3 may be a flexible printed circuit board (FPCB). The second substrate portion 600-2 A first substrate layer 6001 disposed on the uppermost surface of the second substrate portion 600-2, and a second substrate disposed on the lower surface of the first substrate layer 6001 to support the first substrate layer 6001. It may include a third substrate layer 6003 disposed on the lower surface of the layer 6002 and the second substrate layer 6002 to support the first substrate layer 6001 and the second substrate layer 6002. .

The first substrate portion 600-1 is disposed on the lower surface of the third substrate layer 6003 and can support the first substrate layer 6001, the second substrate layer 6002, and the third substrate layer 6003. there is.

The first substrate layer 6001 of the embodiment may be provided with SR (Solder Resist).

Since the first substrate layer 6001 is provided with SR, chemical damage to the second substrate layer 6002 due to oxidation in contact with air can be prevented, and physical damage to the second substrate layer 6002 due to external shock can be prevented. there is.

The second substrate layer 6002 of the embodiment may be provided to form a circuit pattern of the substrate portion 600.

The second substrate layer 6002 may be made of copper.

The third substrate layer 6003 of the embodiment may include an adhesive material that provides adhesion to each layer.

The overall height of the lens driving device and the camera module is determined according to the thickness of the second substrate portion 600-2 including the bobbin 110, the holder 300, and a plurality of substrate layers.

More specifically, the first substrate layer 6001 may be provided to have a first thickness (Δd1), the second substrate layer 6002 may be provided to have a second thickness (Δd2), and the third substrate layer 6002 may be provided to have a second thickness (Δd2). The substrate layer 6003 may be provided to have a third thickness (Δd3).

Additionally, the height of the lens driving unit excluding the substrate layer may be set to the first lens driving unit height (H0).

In order to change the overall height of the lens driving unit of the embodiment while maintaining the height of the bobbin 110 and the holder 300 constant, one of the plurality of substrate layers 6001, 6002, and 6003 constituting the substrate portion 600 Parts can be removed (cutting).

The lower surface of the conventional holder step portion 300A is provided to be in surface contact with the upper surface of the first substrate layer 6001, so that the total height of the lens driving device is equal to the first lens driving unit height H0 and the first thickness Δd1. , the second lens driving height (H3) is provided by combining the second thickness (Δd2) and the third thickness (Δd3).

However, like the lens driving unit of the embodiment, the first substrate layer 6001 is removed so that the lower surface of the holder 300 is not the upper surface of the first substrate layer 6001 but the upper surface of the second substrate layer 6002. If provided for surface contact, the overall height of the lens driving unit in the embodiment may be provided as the third lens driving height (H2), which is the first lens driving unit height (H0) plus the second thickness (Δd2) and the third thickness (Δd3). there is.

That is, by removing the first substrate layer 6001, the height is reduced by the first thickness Δd1 compared to the overall height of the conventional lens driving unit.

The lens driving unit of the embodiment may be equipped to remove not only the first substrate layer 6001, but also both the first substrate layer 6001 and the second substrate layer 6002.

For example, if the first substrate layer 6001 and the second substrate layer 6002 are removed, the lower surface of the holder step portion 300A may be provided to make surface contact with the upper surface of the third substrate layer 6003, As a result, the overall height of the lens driving unit of the embodiment may be provided as the fourth lens driving height (H1), which is the sum of the first lens driving unit height (H0) and the third thickness (Δd3).

In this case, removing the first substrate layer 6001 has the effect of reducing the height by the first thickness (Δd1) and the second thickness (Δd2) compared to the overall height of the conventional lens driving unit.

In other words, by selectively removing a plurality of substrate layers stacked on the substrate portion 600, the overall height of the lens driving unit is reduced by the thickness of the removed substrate layer.

However, this is only an example for convenience of explanation. If necessary, the user is not limited to the above-described embodiment and may remove the plurality of substrate layers stacked on the substrate portion 600 to reduce the overall height of the lens driving unit. It may be reduced, and the scope of rights of the present invention is not limited thereto.

Figure 9 is another embodiment showing various coupling relationships between the cover member and the printed circuit board according to the embodiment.

A lens driving unit of an embodiment will be described with reference to FIG. 9 .

Since it basically has the same configuration as shown in FIGS. 7 and 8, overlapping descriptions will be omitted.

Unlike the lens drive unit shown in FIGS. 7 and 8 in which the overall height of the lens drive unit is reduced by removing a portion of the second substrate portion 600-2 supporting one side of the holder step portion 300A, in the embodiment. The lens driving unit may include a groove formed in the second substrate portion 600-2 to support both sides of the holder 300.

In other words, the substrate portion 600 may be provided with a holder groove (not shown) that provides a space to accommodate a portion of the holder step portion 300A.

Since a part of the holder step portion 300A formed on the second substrate portion 600-2 is provided to be accommodated in the above-described holder groove (not shown), a portion of the holder step portion 300A is formed in the second substrate portion 600-2. -2) There is an effect of improving structural stability by being supported by both sides of the holder groove (not shown) formed on the top.

As described above, the second substrate portion 600-2 may include a plurality of substrate layers, including a first substrate layer 6001, a second substrate layer 6002, and a third substrate layer as shown in the figure. A holder groove (not shown) may be formed on both 6003, but is not limited to this and may be formed only on the first substrate layer 6001 depending on the user's needs, and on the first substrate layer 6001 and the second substrate. It can be formed in the layer 6002, and this does not limit the scope of the present invention.

The second substrate portion 600-2 of the embodiment may include a chamfering portion 600C on at least one side of the holder groove (not shown) that provides a space capable of accommodating a portion of the holder stepped portion 300A. there is.

Chamfering means that the bevel cut on one side of the product is partially cut without extending to the other side.

The chamfering portion 600C may be provided in the first substrate layer 6001.

Since the first substrate layer 6001 is provided with the chamfering portion 600C, when a part of the holder step portion 300A is inserted into the recess (not shown) formed in the substrate portion 600, the chamfering portion 600C It can be assembled more easily and can prevent the substrate portion 600 and the holder 300 from being damaged due to friction with the corner portion that exists when there is no chamfering portion (600C) in the first substrate layer (6001). It works.

In this embodiment, it is shown that the chamfering portion 600C is provided on the first substrate layer 6001 of the substrate portion 600, but if necessary, the chamfering portion 600C may be used not only on the first substrate layer 6001 but also on the substrate portion ( 600) may also be provided on other substrate layers, and this does not limit the scope of the present invention.

Although the above description focuses on examples, this is only an example and does not limit the present invention, and those skilled in the art will understand that the examples are as follows without departing from the essential characteristics of the present example. You will see that various variations and applications are possible. For example, each component specifically shown in the examples can be modified and implemented. And these variations and differences in application should be construed as being included in the scope of the present invention as defined in the appended claims.

100: first lens driving unit 200: second lens driving unit
110: bobbin 120: first coil
130: first magnet 140: housing
147: coupling protrusion 150: upper elastic member
160: lower elastic member 180: second magnet
182: Metal for magnetic field compensation 210: Base
214: Support member seating groove 215: Second detection sensor seating groove
220: plurality of support member pairs 214: seating groove
2143: side portion 2142: lower side portion
2141: Step space 2144: Protruding member
211: Adhesive member 400: Cover base
500: image sensor 600: substrate part
700: Epoxy 800: Dust trap part
410: filter part 430: inclined part
450: Epoxy receiving part 470: Dust trap receiving part
480: upper protruding rib 490: lower protruding rib

Claims (14)

A lens unit including at least one lens;
a lens driving unit that drives the lens unit to move in a first direction and in second and third directions perpendicular to the first direction;
A holder providing a space to accommodate the lens driving unit;
an image sensor that converts light incident from the lens unit into an electrical signal; and
It includes a substrate portion on which the image sensor is placed,
The holder further includes a holder step portion, and the substrate portion and the holder step portion are in surface contact on at least two surfaces.
The substrate part,
First substrate section;
a second substrate portion disposed on the upper surface of the first substrate portion and on which the image sensor is mounted;
A third substrate portion disposed on the lower surface of the first substrate portion,
The second substrate unit,
A first substrate layer in surface contact with the inner surface of the holder step portion;
It includes a second substrate layer in surface contact with the outer surface of the holder step portion,
The first substrate layer and the second substrate layer are provided on the same horizontal line of the second substrate portion with the holder step portion interposed therebetween. delete According to paragraph 1,
A lens driving device wherein the first substrate portion is longer than the second substrate portion, and the holder step portion is provided to make surface contact with the upper surface of the first substrate portion. According to paragraph 3,
A lens driving device wherein the holder step portion is provided to make surface contact with one side of the second substrate portion. According to paragraph 3,
A lens driving device wherein the first substrate portion is a flexible printed circuit board. delete delete delete According to paragraph 1,
The first substrate layer and the second substrate layer include a chamfering portion. delete delete delete delete According to paragraph 1,
The first substrate layer is made of SR (solder resist),
The second substrate layer is made of copper on which a circuit pattern is formed,
A third substrate layer disposed on a lower surface of the second substrate layer and supporting the first and second substrate layers is provided as an adhesive member.

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