KR20230019254A - Lens moving unit and camera module including the same - Google Patents

Abstract

The present invention relates to a lens driving device and a camera module. The lens driving device comprises: a bobbin having at least one lens installed therein and having a first coil installed on an outer circumference surface; a first magnet arranged around the bobbin to face the first coil; a housing for supporting the first magnet; a first lens driving unit including upper and lower elastic members, which are combined with the bobbin and the housing, and moving the bobbin in a first direction parallel to an optical axis using interaction between the first magnet and the first coil; a base arranged with a certain gap from the first lens driving unit; a plurality of supporting members for supporting the housing to be able to move in a second and a third direction perpendicular to the first direction with respect to the base; a second coil arranged to face the first magnet; a second lens driving unit including a circuit board arranged by a bonding member on one surface of the base, and moving the housing in the second and the third direction using interaction between the first magnet and the second coil; a sensor holder arranged on one surface of the base to support the base; and epoxy applied between the sensor holder and the base to prevent the base from sagging. Therefore, the quality of the camera module is further improved.

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 technology of a voice coil motor (VCM) used in a conventional camera module to a camera module for ultra-small size and low power consumption, related research has been actively conducted.

In the case of a camera module mounted on a small electronic product such as a smartphone, the camera module may be frequently shocked during use, and the camera module may be slightly shaken due to a user's hand shaking during shooting. In view of this point, there has recently been a demand for the development of a technology for additionally installing an anti-shake means in a camera module.

Camera modules are generally assembled such that a lens barrel assembly provided to stack a plurality of lenses is seated on an upper surface of a printed circuit board (PCB).

In the case of the existing camera module, the alignment of the lens barrel assembly assembled on the printed circuit board and the printed circuit board did not have a significant effect, but recently the size of the camera module has been reduced and higher quality is realized. As it is a trend, alignment has a great influence on the quality of camera modules.

When the sagging of both sides of the lens barrel assembly is not uniform, the lens barrel assembly and the printed circuit board are out of focus, which deteriorates the quality of the camera module.

(Patent Document 1) KR 10-2015-0066819 A

A lens driving device and a camera module including the same according to an embodiment prevent an out-of-focus problem between the lens barrel assembly and the printed circuit board when the sagging of both sides of the lens barrel assembly is not uniform, thereby further improving the quality of the camera module It is a task to be solved to provide a lens driving device and a camera module including the same.

A lens driving device according to an embodiment includes a bobbin in which at least one lens is installed on an inner side and a first coil is installed on an outer circumferential surface; a first magnet disposed around the bobbin to face the first coil; a housing supporting the first magnet; and a first lens driving unit including upper and lower elastic members coupled to the bobbin and the housing to move the bobbin in a first direction parallel to an optical axis by an interaction between the first magnet and the first coil; a base spaced apart from the first lens driving unit by a predetermined distance; a plurality of support members movably supporting the housing in second and third directions perpendicular to the first direction with respect to the base; a second coil disposed to face the first magnet; and a circuit board disposed on one surface of the base by an adhesive member, and a second lens driving unit configured to move the housing in the second and third directions by an interaction between the first magnet and the second coil. ; a sensor holder disposed on one surface of the base to support the base; and an epoxy applied between the sensor holder and the base to support the base.

In addition, the sensor holder may include an inclined portion disposed on an outer surface of the sensor holder; To provide a lens driving device including a; epoxy accommodating part disposed on one surface of the sensor holder to accommodate the epoxy as a means for solving the problem.

In addition, as a means of solving the problem, providing a lens driving device provided to be spaced apart from the base by a predetermined interval is the inclined portion and the epoxy accommodating portion.

In addition, the epoxy, the first epoxy applied between the epoxy receiving portion and the base; To provide a lens driving device comprising a; and a second epoxy applied between the inclined portion and the base.

In addition, as a means for solving the problem, providing a lens driving device in which the first epoxy and the second epoxy are provided as the same member is provided.

In addition, as a solution to the problem, providing a lens driving device in which the first epoxy and the second epoxy are provided as different members is provided.

In addition, as a solution to the problem, one surface of the epoxy receiving portion is to provide a lens driving device having a concave shape toward the bottom.

In addition, as a means of solving the problem, one surface of the epoxy receiving unit provides a lens driving device including at least one level difference.

In addition, as a solution to the problem, the epoxy accommodating unit provides a lens driving device including a plurality of protruding accommodating units protruding upward at a predetermined height from one surface of the epoxy accommodating unit.

In addition, as a means to solve the problem, the epoxy accommodating unit provides a lens driving device including a plurality of concave accommodating units provided to sink to a predetermined height on one surface of the epoxy accommodating unit.

In addition, as a means for solving the problem, one surface of the inclined portion is to provide a lens driving device having a concave shape or including at least one level difference.

In addition, as a means to solve the problem, it is to provide a lens driving device including a plurality of protrusion-receiving parts or concave-receiving parts provided so that the inclined part protrudes or sinks at a predetermined height toward the upper part of the inclined part.

In addition, at least one lens is installed on the inner side of the bobbin and the first coil is installed on the outer circumferential surface; a first magnet disposed around the bobbin to face the first coil; a housing supporting the first magnet; and a first lens driving unit including upper and lower elastic members coupled to the bobbin and the housing to move the bobbin in a first direction parallel to an optical axis by an interaction between the first magnet and the first coil; a base spaced apart from the first lens driving unit by a predetermined distance; a plurality of support members movably supporting the housing in second and third directions perpendicular to the first direction with respect to the base; a second coil disposed to face the first magnet; and a circuit board disposed on one surface of the base by an adhesive member, and a second lens driving unit configured to move the housing in the second and third directions by an interaction between the first magnet and the second coil. ; a sensor holder disposed on one surface of the base to support the base; Epoxy applied between the sensor holder and the base to prevent the base from sagging; image sensor; And to provide a camera module comprising a; printed circuit board on which the image sensor is mounted as a means of solving the problem.

In addition, the sensor holder may include an inclined portion disposed on an outer surface of the sensor holder; As a means of solving the problem, providing a camera module including a; epoxy accommodating part disposed on one surface of the sensor holder to accommodate the epoxy.

In addition, the epoxy, the first epoxy applied between the epoxy receiving portion and the base; And a second epoxy applied between the inclined portion and the base; to provide a camera module comprising a means for solving the problem.

In addition, as a means to solve the problem, the epoxy accommodating unit includes a plurality of protruding accommodating units or concave accommodating units provided so as to protrude a predetermined height toward the upper portion of the inclined portion or sink to a predetermined height.

In addition, as a means of solving the problem, one surface of the epoxy receiving part is to provide a camera module including a concave shape or at least one step.

In addition, as a means for solving the problem, the inclined part includes a plurality of protruding accommodating parts or concave accommodating parts provided so as to protrude or sink to a predetermined height toward the upper part of the inclined part.

In addition, one surface of the inclined portion is a concave shape or a solution to the problem is to provide a camera module including at least one step difference.

In addition, as a means of solving the problem, providing a camera module in which the first epoxy and the second epoxy are provided as members different from each other.

A lens driving device and a camera module including the same according to an embodiment prevent an out-of-focus problem between the lens barrel assembly and the printed circuit board when the sagging of both sides of the lens barrel assembly is not uniform, thereby further improving the quality of the camera module It is an effect of the invention to provide a lens driving device and a camera module including the same.

1 is an exploded perspective view schematically illustrating a camera module according to an exemplary embodiment.
2(a) and 2(b) show an assembled state of a lens barrel assembly, a sensor holder, and a substrate unit according to an exemplary embodiment.
FIG. 3(a) shows a camera module according to an embodiment before including the second epoxy, and FIG. 3(b) shows the camera module according to an embodiment after including the second epoxy.
4 illustrates a sensor holder of a lens driving device according to an exemplary embodiment.
5(a) to 5(d) illustrate various embodiments of an epoxy accommodating part of a sensor holder of a lens driving device according to an exemplary embodiment.
6 is a perspective view schematically illustrating a lens driving device according to an exemplary embodiment.
7 is an exploded perspective view illustrating a lens driving device according to an exemplary embodiment.
8 illustrates a base, a printed circuit board, and a second coil according to an embodiment.
9 illustrates a second coil, a circuit board, and a base of a lens driving device according to an exemplary embodiment.

Hereinafter, examples will be described in order to explain the present invention in detail, and will be described in detail with reference to the accompanying drawings to help understanding of the present invention. However, embodiments according to the present invention can be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

In the description of the embodiment according to the present invention, in the case of being described as being formed on the "upper (above)" or "under (on or under)" of each element, the upper (upper) or lower (lower) (on or under) includes both elements formed by directly contacting each other or by placing one or more other elements between the two elements (indirectly). In addition, when expressed as “up (up)” or “down (down) (on or under)”, it may include the meaning of not only the upward direction but also the downward direction based on one element.

In addition, relational terms such as "first" and "second", "upper/upper/upper" and "lower/lower/lower" used below refer to any physical or logical relationship or It may be used only to distinguish one entity or element from another, without necessarily requiring or implying an order.

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

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

An 'image stabilization device' applied to a small camera module of a mobile device such as a smartphone or tablet PC prevents the outline of the captured image from being formed clearly due to vibration caused by the user's hand shake when capturing a still image. It may refer to a device configured to

Also, an 'auto focusing device' is a device that automatically focuses an image of a subject on an image sensor surface. Such an image stabilization device and auto focusing device may be configured in various ways. A lens driving device according to an embodiment moves an optical module composed of at least one lens in a first direction parallel to an optical axis, or in a first direction. The image stabilization operation and/or the auto focusing operation may be performed by moving with respect to the plane formed by the second and third directions perpendicular to the .

Hereinafter, the printed circuit board 250 may be referred to as a 'substrate'. Hereinafter, the seating groove 215 may be referred to as a 'home'. Hereinafter, the support groove 255 may be referred to as a 'groove'. Alternatively, in order to distinguish the seating groove 215 and the support groove 255 from each other and to distinguish them from the first groove 2145, the second groove 2146, and the third groove 2147, one of them is referred to as a 'fourth groove'. One may be referred to as a 'home' and the other may be referred to as a 'fifth home'.

1 is an exploded perspective view schematically illustrating a camera module according to an exemplary embodiment.

Referring to FIG. 1 , the camera module according to the embodiment provides a bobbin 110 including a lens barrel in which a plurality of lenses are stacked, and an accommodation space accommodating the bobbin 110 to accommodate the bobbin 110. The cover member 300 provided, the sensor holder 400 provided on the lower surface of the cover member 300 and supporting the lower surface of the cover member 300, and the bobbin 110 disposed on one side of the sensor holder 400 It provides an image sensor 500 that converts light incident on it into an electrical signal, a space in which the image sensor 500 is disposed, and is provided to transmit and convert the electrical signal converted by the image sensor 500 to a controller (not shown). It may include a substrate portion 600 to be.

The sensor holder 400 may be provided between the lower surface of the cover member 300 and the upper surface of the substrate unit 600 .

More specifically, the sensor holder 400 may be attached to the lower surface of the cover member 300 so that the sensor holder 400 and the cover member 300 are coupled, and the sensor holder 400 and the cover member 300 ) may be assembled to be seated on the upper surface of the substrate unit 600 in a coupled state.

However, this shows one embodiment and the user can generate the sensor holder 400 as needed and directly couple the cover member 300 and the substrate 600, which does not limit the scope of the present invention. No.

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

The sensor holder 400 may have an optically hollow shape, so that the lens barrel collects light from the outside and transmits the light to the image sensor 500 through the sensor holder 400 .

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

The filter unit 410 of one embodiment may be an infrared cut off filter (IR Cut Off Filter).

The infrared cut-off filter means that the external light collected by the lens barrel includes an infrared region of a wavelength range that cannot be seen by humans. In order to prevent this, it is a member that blocks light in the wavelength range of the infrared region.

However, the filter unit 410 of the embodiment may be provided as a filter that blocks other wavelength bands in addition to the infrared range as needed, and the scope of the present invention is not limited.

The substrate unit 600 includes a substrate base 610 providing one surface on which the bobbin 110, the cover member 300, the sensor holder 400, and the image sensor 500 are disposed, and signals received from the substrate base 610. The connector unit 650 and one end provided to be electrically connected to the substrate base 610 and the other end provided to be electrically connected to the connector unit 650 to transmit the control unit (not shown) to the substrate base 610 It may include a connection board 630 provided to transfer the electrical signal to the connector unit 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 a conventional printed circuit board, since it is provided to be freely bent, there is an effect of using a limited space more efficiently.

However, this is an example, and the connection board 630 may be provided as a general printed circuit board rather than a flexible board according to the user's needs, and the scope of the present invention is not limited.

2(a) and 2(b) show an assembled state of a lens barrel assembly, a sensor holder, and a substrate unit according to an exemplary embodiment.

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

The substrate base 610 may include a plurality of terminal units 611 electrically connecting the substrate unit 600 and the image sensor 500 to at least one surface where the substrate base 610 and the cover member 300 come into contact. there is.

The terminal unit 611 includes a first terminal unit 6111 provided along the first surface of the lower surface of the cover member 300 and a second terminal unit 6111 provided along the second surface facing the first surface of the lower surface of the cover member 300. A terminal unit 6113 may be included.

In addition, the third surface adjacent to the first surface of the lower surface of the cover member 300 on which the first terminal unit 6111 is disposed and the fourth surface facing the third surface of the lower surface of the cover member 300 have epoxy 700 ) may be included.

That is, the epoxy 700 may be disposed on the lower surface of the cover member 300 where the terminal unit 611 is not provided, which prevents this from being bulky when the epoxy 700 is disposed on the terminal unit 611 is to do

However, the epoxy 700 and the terminal unit 611 may be disposed in different positions according to the user's needs, and the image sensor 500 and the substrate unit 600 are electrically connected through the terminal unit 611, and the epoxy unit 700 As long as the cover member 300 and the sensor holder 400 are physically coupled through ), the scope of the present invention is not limited.

FIG. 3(a) shows a camera module according to an embodiment before including the second epoxy, and FIG. 3(b) shows the camera module according to an embodiment after including the second epoxy.

Referring to Figures 3 (a) and 3 (b), the camera module of the embodiment is a cover member 300 forming the exterior, a base disposed on one side of the cover member 300 to support the cover member 300 ( 210), a sensor holder 400 providing a space in which the base 210 is seated, and a first portion disposed between the sensor holder 400 and the base 210 to adhere the base 210 to the sensor holder 400. It is disposed on one side of the epoxy 710 and the sensor holder 400, provides a space where the image sensor 500 (FIG. 2) is placed, and transmits and converts the electrical signal converted from the image sensor 500 to a controller (not shown). It may include a substrate portion 600 provided to do so.

The base 210 may include a base rib 216 provided to protrude from an outer circumferential surface to support the cover member 300 .

In more detail, the base rib 216 supports the first rib 2161 provided to protrude toward the outside of the base 210 so as to support the left side of the cover member 300 and the right side of the cover member 300. A second rib 2163 provided to protrude toward the outside of the base 210 may be included.

However, this shows only one embodiment, and the shape of the base rib 216 can be modified according to the needs of the user, and the base rib 216 is sufficient as long as it is provided to support the cover member 300, and the above-described embodiment The scope of the present invention is not limited by

Although the base rib 216 shown in FIG. 3 (a) is provided to support the cover member 300, the base rib 216 is moved in a direction parallel to the direction of gravity due to the load of the cover member 300 or an impact applied from the outside. A problem arises with

Due to sagging of the base rib 216, the quality of the focus camera module is deteriorated.

In order to solve this problem, the camera module shown in FIG. 3(b) will be described below.

Since the basic structure of the camera module shown in FIG. 3(b) is the same as that of the camera module shown in FIG. 3(a), the same parts will be omitted and only differences will be described.

The first epoxy 710 is disposed between the base 210 and the sensor holder 400. In FIG. 3 (a), the first epoxy 710 is between the base rib 216 and the sensor holder 400. Due to the disposition, a phenomenon in which the base rib 216 is drooped due to the load of the cover member 300 or an external shock applied thereto occurs.

Therefore, in order to prevent this, the camera module of this embodiment may include a second epoxy 730 between the sensor holder 400 and the base rib 216 .

The first epoxy 710 and the second epoxy 730 may be provided as the same member.

In addition, the first epoxy 710 and the second epoxy 730 may be provided as different members.

Since the second epoxy 730 is disposed between the sensor holder 400 and the base rib 216, the base rib 216 is not sagged by the load of the cover member 300 or an external force applied to the cover member 300. has the effect of preventing the phenomenon.

4 illustrates a sensor holder of a lens driving device according to an exemplary embodiment.

Referring to FIG. 4, the sensor holder 400 of the embodiment includes inclined portions 431 and 433 disposed on the outer surface of the sensor holder 400 and disposed on one surface of the sensor holder 400 to accommodate the epoxy 700. The epoxy accommodating parts 451 and 453, the dust trap accommodating parts 471 and 473 disposed on one surface of the sensor holder 400 and spaced apart from the epoxy accommodating parts 451 and 453 by a predetermined distance in the inner radial direction, from the outside Upper protruding ribs 481 and 483 provided to protrude a predetermined height toward the top of the sensor holder 400 and the substrate portion 600 (FIG. 3) in order to prevent incoming foreign substances from penetrating toward the center of the sensor holder 400 ) may include lower protruding ribs 491 and 493 provided to protrude to a predetermined height toward the bottom of the sensor holder 400 in order to fix the sensor holder 400 to the sensor holder 400 .

The inclined portions 431 and 433 have an effect of increasing the efficiency of curing the epoxy 700 disposed between the sensor holder 400 and the cover member 300 .

More specifically, the epoxy 700 is placed between the sensor holder 400 and the cover member 300 to bond the sensor holder 400 and the cover member 300, and the epoxy 700 is primarily cured. Primary curing is performed using UV (Ultra Violet), and secondarily, heat is applied to harden the epoxy 700 so that the sensor holder 400 and the cover member 300 are more firmly bonded.

At this time, UV should be irradiated toward the epoxy 700 in the primary curing, but due to the inclined portions 431 and 433 provided on the outer surface of the sensor holder 400, the UV is irradiated toward the epoxy 700 more efficiently. This has the effect of accelerating the curing of the epoxy 700.

The dust trap accommodating portions 471 and 473 serve to prevent foreign substances such as dust from penetrating into the central portion of the sensor holder 400 where the lens barrel assembly is coupled to the sensor holder 400 .

More specifically, the dust trap accommodating parts 471 and 473 may be provided to be recessed at a predetermined height on the upper surface of the sensor holder 400 .

In addition, a dust trap (not shown) having an adhesive ability may be disposed on the lower surfaces of the dust trap accommodating portions 471 and 473 .

That is, when a foreign substance introduced from the outside moves in a direction parallel to gravity by its own weight, it has an effect of preventing penetration into the center of the sensor holder 400 by sticking to a dust trap (not shown) having adhesive ability. .

However, the shape and position of the dust trap accommodating parts 471 and 473 can be changed as needed, and it is sufficient to prevent foreign substances from entering the sensor holder 400 from penetrating into the center of the sensor holder 400. Do not limit the scope.

The epoxy receiving parts 451 and 453 will be described in detail with reference to FIGS. 5 (a) to (d) below.

5(a) to (d) illustrate various embodiments of an epoxy accommodating part of a sensor holder of a lens driving device according to an exemplary embodiment.

5(a) to (d), the epoxy accommodating parts 451 and 453 of the sensor holder 400 of the lens driving device according to the embodiment have a shape for more efficiently accommodating the first epoxy 710. can have

As shown in Figure 5 (a), the epoxy receiving portion 450 may be provided in a concave shape toward the lower direction.

In the process of applying the epoxy 700 to the epoxy accommodating portion 450, when an appropriate amount or more of the epoxy 700 is applied, it is provided in a concave shape toward the lower direction, thereby expanding the space in which the epoxy 700 is accommodated and moving to the surroundings. There is an effect of preventing the overflow of the epoxy 700.

Referring to FIG. 5 (b), the epoxy accommodating part 450 may be provided to have a step. Since the epoxy accommodating portion 450 has a step difference, when an appropriate amount or more of the epoxy 700 is applied, the space in which the epoxy 700 is accommodated is widened to prevent the epoxy 700 from overflowing to the surroundings.

However, the level difference of the epoxy accommodating part 450 shown in FIG. 5 (b) may be provided as one as shown, but may include a plurality of levels if necessary, and is not limited to the above-described embodiment, and this is also It is not intended to limit the scope of the present invention.

Referring to FIG. 5(c) , the epoxy accommodating portion 450 may include a plurality of protruding accommodating portions 455 protruding at a predetermined height toward an upper portion of the epoxy accommodating portion 450 .

The shape of the cross section of the protruding receiving portion 455 may be a semicircular shape or a triangular shape as shown in FIG. 5(c), and may be provided in other shapes as needed.

Since the plurality of protruding accommodating portions 455 are provided in the epoxy accommodating portion 450, the contact surface area between the epoxy 700 applied to the epoxy accommodating portion 450 and the protruding accommodating portion 455 is increased, thereby increasing the epoxy 700 There is an effect that the bond between the epoxy receiving portion 450 and the stronger.

Referring to FIG. 5(d) , the epoxy accommodating portion 450 may include a plurality of concave accommodating portions 457 concavely provided on the upper surface of the epoxy accommodating portion 450 .

The shape of the cross section of the concave receiving portion 457 may be a semicircular shape or a triangular shape as shown in FIG. 5(c), or other shapes may be provided as necessary.

Since the epoxy accommodating portion 450 is provided with a plurality of concave accommodating portions 457, the contact surface area between the epoxy 700 applied to the epoxy accommodating portion 450 and the concave accommodating portion 457 is increased, thereby increasing the epoxy 700. There is a feature that the bond between the epoxy receiving portion 450 is more robust.

5(a) to 5(b) show various embodiments of the shape of the epoxy accommodating portions 451 and 453, but this is not limited to the epoxy accommodating portions 451 and 453, and the inclined portions 431 and 433 ) It may also be provided in the same shape as the above-described epoxy receiving parts (451, 453).

6 shows a schematic perspective view of a lens driving device according to an embodiment, and FIG. 7 shows an exploded perspective view of the lens driving device illustrated in FIG. 6 .

Referring to FIG. 6 , the lens driving device according to the 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 serve as the aforementioned auto focusing device, and the second lens driving unit 200 may serve as the aforementioned image stabilization device.

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

As shown in FIG. 7 , the lens driving device according to the embodiment may include a movable part. At this time, the movable unit may perform functions of auto focusing of the lens and hand shake correction. The movable unit may include the bobbin 110, the first coil 120, the first magnet 130, the housing 140, the upper elastic member 150, and the lower elastic member 160.

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

In addition, the bobbin 110 is elastically supported by the upper and lower elastic members 150 and 160 and moves in a first direction to perform an auto focusing function.

The bobbin 110 may include a lens barrel (not shown) in which at least one lens is installed. The lens barrel may be coupled to the inside of the bobbin 110 in various ways.

For example, a female screw thread may be formed on an inner circumferential surface of the bobbin 110 and a male screw thread corresponding to the screw thread may be formed on an outer circumferential surface of the lens barrel, and the lens barrel may be coupled to the bobbin 110 by screwing of the female screw thread. However, this is not limited thereto, and the lens barrel may be directly fixed to the inside of the bobbin 110 by a method other than screw coupling without forming a thread on the inner circumferential surface of the bobbin 110 . Alternatively, the one or more lenses may be integrally formed with the bobbin 110 without a lens barrel.

The lens coupled to the lens barrel may be composed of one sheet, or two or more lenses may form an optical system.

The auto focusing function is controlled according to the direction of the current, and the auto focusing function may be implemented by moving the bobbin 110 in the first direction. For example, when a forward current is applied, the bobbin 110 may move upward from an initial position, and when a reverse current is applied, the bobbin 110 may move downward from an initial position. Alternatively, the moving distance in one direction from the initial position may be increased or decreased by adjusting the amount of one-way current.

A plurality of upper support protrusions and lower support protrusions may protrude from the upper and lower surfaces of the bobbin 110 . The upper support protrusion may be provided in a cylindrical shape or a prismatic shape, and may couple and fix the upper elastic member 150 . The lower support protrusion may be provided in a cylindrical shape or a prismatic shape like the upper support protrusion described above, and may couple and fix the lower elastic member 160 .

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. In this case, a through hole corresponding to the upper support protrusion may be formed in the upper elastic member 150 , and a through hole corresponding to the lower support protrusion may be formed in the lower elastic member 160 . Each of the support protrusions and the through hole may be fixedly coupled by thermal fusion or an adhesive member such as epoxy.

The housing 140 may have a hollow pillar shape supporting the first magnet 130 and may be formed in a substantially rectangular shape. The first magnet 130 and the support member 220 may be coupled to each other and disposed on the side surface of the housing 140 .

In addition, as described above, the bobbin 110 guided by the elastic members 150 and 160 and moving in the first direction may be disposed inside the housing 140 . In the embodiment, the first magnet 130 may be disposed at a corner of the housing 140, and the support member 220 may be disposed at a side surface of the housing 140.

The upper elastic member 150 and the lower elastic member 160 may elastically support the upward and/or downward movement 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 in two pieces separated from each other. Through this two-part structure, the divided parts of the upper elastic member 150 may receive currents of different polarities or different power sources. Also, as a modified embodiment, the lower elastic member 160 may have a two-part structure and the upper elastic member 150 may have an integral structure.

Meanwhile, the upper elastic member 150, the lower elastic member 160, the bobbin 110, and the housing 140 may be assembled through thermal fusion and/or bonding using an adhesive. At this time, for example, the fixing operation may be completed by bonding using an adhesive after heat fusion fixation.

The base 210 is disposed below the bobbin 110 and may be provided in a substantially rectangular shape, the printed circuit board 250 may be seated, and the lower side of the support member 220 may be fixed. In addition, 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 . An adhesive is applied to the seating groove 214 of the support member 220 to fix the support member 220 so as not to move.

As shown in FIG. 9 , a support groove 255 having a corresponding size may be formed on a surface of the base 210 facing the portion where the terminal surface 253 of the printed circuit board 250 is formed. The support groove 255 is formed concave inward by a predetermined depth from the outer circumferential surface of the base 210, so that the portion where the terminal surface 253 is formed does not protrude outward or the amount of protrusion can be adjusted.

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

Since each of the support members 220 according to the embodiment is disposed on the rectangular outer surface of the housing 140, a total of four may be installed symmetrically with each other. However, it is not limited to this, and it is also possible to consist of eight, two for each straight plane. Also, the support member 220 may be electrically connected to the upper elastic member 150 or electrically connected to a straight surface of the upper elastic member 150 .

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

Meanwhile, in FIG. 7, the plate-shaped support member 220 is illustrated as an embodiment, but 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, when viewed from the driving side of the embodiment, the housing 140 may move parallel to the x-axis and y-axis, but may also move slightly inclined to the x-axis and y-axis when moving while being supported by the support member 220 there is.

In addition, the first magnet 130 needs to be installed at a position corresponding to the second coil 230.

The second coil 230 may be disposed to face the first magnet 130 fixed to the housing 140 . In one embodiment, the second coil 230 may be disposed outside the first magnet 130 . Alternatively, the second coil 230 may be installed at a lower side of the first magnet 130 at a predetermined distance.

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

In the case of the embodiment, a circuit pattern is formed on the circuit member 231 in the shape of the second coil 230, and an additional second coil may be disposed above the circuit member 231, but is not limited thereto, and the circuit pattern is not limited thereto. Without forming a circuit pattern in the shape of the second coil 230 on the member 231 , only a separate second coil 230 may be disposed above the circuit member 231 .

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

The 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 above the base 210 .

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

The printed circuit board 250 is coupled to the upper surface of the base 210, and as shown in FIG. 7, a through hole or groove is formed at a corresponding position so that the support member 220 seating groove 214 can be exposed. can be formed

A bent terminal surface 253 on which the terminal 251 is installed may be formed on the printed circuit board 250 . In the embodiment, a printed circuit board 250 having two bent terminal faces 253 is shown. A plurality of terminals 251 are disposed on the terminal surface 253 to receive external power and supply current to the first coil 120 and the second coil. The number of terminals formed on the terminal surface 253 may be increased or decreased according to the types of components that need to be controlled. Also, the printed circuit board 250 may include one or more than three terminal surfaces 253 .

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

8 is an exploded perspective view illustrating a base 210, a printed circuit board 250, and a second coil 230 according to an exemplary embodiment. The lens driving device may further include a position 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 the movement of the housing 140 in the first direction, and in some cases may be provided to detect the movement of the housing 140 in the second and third directions. .

The position sensor 240 may be provided with a hall sensor or the like, and any other sensor capable of detecting a change in magnetic force may be used. As shown in FIG. 8, a total of two position sensors 240 may be installed at the corners of the base 210 disposed below the printed circuit board 250, and the mounted position sensors 240 ) may be inserted into the position sensor seating groove 215 formed in the base 210. A lower surface of the printed circuit board 240 may be an opposite surface to the surface on which the second coil 230 is disposed.

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

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

The camera module according to the embodiment may include a lens barrel coupled to the bobbin 110 and an image sensor (not shown). In this case, the lens barrel may include at least one lens that transmits an image to the image sensor.

In addition, the camera module may further include an infrared cut filter (not shown). The infrared cut filter serves to block light in the infrared region from being incident on the image sensor.

In this case, in the base 210 illustrated in FIG. 6 , an infrared cut filter may be installed at a position corresponding to the image sensor and may be coupled to a holder member (not shown). Also, 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, or the terminal may be integrally formed using a surface electrode or the like.

In addition, an adhesive member 211 for bonding 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, one side of the base 210 and one side of the printed circuit board 250 may be provided at a position in surface contact. can

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

The adhesive member 211 shown in this embodiment shows an embodiment, and it is sufficient to simply adhere the printed circuit board 250 to the base 210, and the position and number of the adhesive members 211 are provided. The scope of the present invention is not limited.

The base 210 may further include a stepped portion in the groove 214 in which the spring unit (not shown) is seated.

In order to mutually adhere the base 210 and the printed circuit board 250, 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 printing The adhesive force of the circuit board 250 is lowered and the printed circuit board 250 may be lifted from the base 210, and if the amount of the adhesive member 211 is large, the adhesive member 211 is attached to the seating groove 214. ) is invaded, and it is difficult to accurately couple the spring unit (not shown) to the attachment groove 214.

Therefore, by further providing a stepped 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 surface portion 2143 forming the side surface 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. A stepped space 2141 may be included. As shown in FIG. 8 , the stepped space 2141 may be formed by a first groove 2145 formed on a side surface of the base 210 . In addition, an additional stepped space may be formed by the second groove 2146 formed in the first groove 2145 . The second groove 2146 may be more depressed than the first groove 2145 based on the side of the base 210 . The base 210 may include a third groove 2147 concavely formed on the upper surface of the base 210 and connected to the second groove 2146 . The support member 220 may be disposed in the third groove 2147 and fixed by an adhesive. Here, the third groove 2147 may correspond to the seating groove 214 in which the support member 220 is seated.

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

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

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

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

Since the cross section of the lower surface portion 2142 of the stepped space 2141 is provided in a concave shape toward the first direction perpendicular to the lower surface portion 2142, the adhesive member 211 gathers toward the center of the lower surface portion 2142 There is an effect that can more effectively prevent the adhesive member 211 from flowing into the seating groove 214 .

In addition, the cross section of the lower surface portion 2142 of the stepped space 2141 may be provided in a sinusoidal shape.

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

In addition, in the present embodiment, although it is shown that one stepped portion is provided, a plurality of stepped portions may be provided.

Since a plurality of stepped portions are provided, a space capable of accommodating the adhesive member 211 in double or triple layers is created, thereby preventing the adhesive member 211 from entering the seating groove 214 more effectively. 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.

Since the lower surface portion 2142 is provided with a plurality of protruding members 2144, the adhesive member 211 introduced into the stepped portion increases resistance to flow, so that the adhesive member 211 introduced into the stepped portion is seated in the groove ( 214) can be prevented more efficiently.

In the drawings, the plurality of protruding members 2144 are shown to be provided in a hemispherical shape, but this is only an exemplary embodiment, and the protruding members 2144 may be provided in a conical shape or a polygonal shape.

Meanwhile, the base 210 may function as a sensor holder to protect the image sensor, and in this case, a protrusion may be formed downward along a side surface of the base 210 . However, this is not an essential configuration, and although not shown, a separate sensor holder may be disposed below the base 210 to perform its role.

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

Meanwhile, referring to FIG. 9 , the second coil 230 may include a fifth through hole 230a passing through 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 region of the FP coil. In addition, the fifth through hole 230a is not formed in the 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.

Although the above has been described with reference to the embodiments, these are merely examples and do not limit the present invention, and those skilled in the art to which the present invention belongs will not deviate from the essential characteristics of the present embodiment. It will be appreciated that various variations and applications are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And the differences related to these modifications and applications 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: a plurality of support member pairs 214: seating groove
2143: side part 2142: lower surface part
2141: stepped space 2144: protruding member
211: adhesive member 400: cover base
500: image sensor 600: substrate
700: Epoxy 800: Dust trap part
410: filter part 430: inclined part
450: epoxy accommodating part 470: dust trap accommodating part
480: upper protruding rib 490: lower protruding rib

Claims (20)

Base;
a housing disposed on the base;
a bobbin disposed within the housing;
a first coil disposed on the bobbin;
a magnet disposed in the housing; and
And a second coil disposed on the base,
A first step space is formed by a first groove formed on a side surface of the base,
A second stepped space is formed by a second groove formed in the first groove of the base,
The second groove is recessed more than the first groove based on the side surface of the base. According to claim 1,
A lens driving device including an adhesive disposed in the first stepped space. According to claim 1,
It is disposed on the base and includes a cover member including a side plate,
The first step space is formed between the base and the side plate of the cover member in a direction perpendicular to an optical axis. According to claim 1,
A substrate disposed on the base and including the second coil,
The substrate includes a body portion disposed on an upper surface of the base and a terminal portion disposed on the side surface of the base and including terminals,
The side surface of the base includes a first side and a second side disposed opposite to each other, and a third side and a fourth side disposed opposite to each other,
The terminal unit includes a first terminal unit disposed on the first side surface of the base and a second terminal unit disposed on the second side surface of the base. According to claim 4,
The first step space is formed on at least one of the third side surface and the fourth side surface of the base. According to claim 4,
The base includes a fourth groove concavely formed on the first side and the second side of the base,
The lens driving device of claim 1 , wherein the terminal portion of the board is disposed in the fourth groove of the base. According to claim 4,
The first groove and the second groove are recessed from one surface connecting the first to fourth sides of the base,
The first groove is recessed more than the second groove based on the one surface of the base. According to claim 1,
a substrate disposed on the base and including the second coil; and
A sensor disposed on the substrate and sensing the magnet;
The base includes a fifth groove formed on an upper surface of the base,
The sensor is disposed in the fifth groove of the base. According to claim 8,
The first step space is spaced apart from the fifth groove of the base. According to claim 2,
The base includes a third groove concavely formed on an upper surface of the base and connected to the second groove,
The third groove is recessed more than the second groove based on the side surface of the base. According to claim 10,
an upper elastic member connecting an upper portion of the housing and an upper portion of the bobbin; and
And a lower elastic member connecting the lower part of the housing and the lower part of the bobbin,
The upper elastic member is a lens driving device electrically connected to the first coil. According to claim 11,
a substrate disposed on the base and including the second coil; and
A lens driving device comprising a support member electrically connecting the substrate and the upper elastic member. According to claim 12,
The lens driving device wherein the support member is formed of a wire. According to claim 12,
A lens driving device wherein a portion of the support member is fixed to the base by the adhesive. Base;
a cover member coupled to the base and including a side plate;
a housing disposed within the cover member;
a bobbin disposed within the housing;
a first coil disposed on the bobbin;
a magnet disposed in the housing; and
And a second coil disposed on the base,
A first step space and a second step space are formed between the base and the side plate of the cover member in a direction perpendicular to the optical axis,
The second stepped space is connected to the first stepped space,
A depth of the second stepped space from the side plate of the cover member is greater than a depth of the first stepped space from the side plate of the cover member. According to claim 15,
A lens driving device including an adhesive disposed in the first stepped space. According to claim 15,
A substrate disposed on the base and including the second coil,
The substrate includes a body portion disposed on an upper surface of the base and a terminal portion disposed on a side surface of the base and including terminals,
The side surface of the base includes a first side and a second side disposed opposite to each other, and a third side and a fourth side disposed opposite to each other,
The terminal unit includes a first terminal unit disposed on the first side surface of the base and a second terminal unit disposed on the second side surface of the base. printed circuit board;
an image sensor disposed on the printed circuit board;
The lens driving device according to any one of claims 1 to 17 disposed on the printed circuit board; and
A camera module including a lens disposed in the lens driving device. A mobile device comprising the camera module of claim 18. Base;
a housing disposed on the base;
a bobbin disposed within the housing;
a first coil disposed on the bobbin;
a magnet disposed in the housing; and
A lens driving device including a second coil disposed on the base.

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