KR20220108955A - Lens Actuator and Camera module including the same - Google Patents

Abstract

An embodiment of the present invention relates to a lens driving device and a camera module including the same. According to the embodiment of the present invention, a lens driving device includes: a bobbin on which a lens is disposed; a first housing in which the bobbin is disposed; and a first guide member disposed between the bobbin and the first housing. The first housing may have a first guide groove in which the first guide member is disposed, and the first guide groove may have an asymmetrical shape. Therefore, when an impact is applied to the camera module, the technical problem of separation of components of the lens driving device is solved.

Description

Lens actuator and camera module including the same

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

The camera module captures a subject and stores it as an image or video, and is installed in mobile terminals such as cell phones, laptops, drones, and vehicles.

On the other hand, portable devices such as smartphones, tablet PCs, and laptops have built-in micro camera modules, and these camera modules automatically adjust the distance between the image sensor and the lens to align the focal length of the lens (autofocus, AF). function can be performed.

In addition, recent camera modules may perform a zooming function of zooming up or zooming out by increasing or decreasing the magnification of a distant subject through a zoom lens.

In addition, recent camera modules employ image stabilization (IS) technology to correct or prevent image stabilization caused by unstable fixing devices, user movement, or camera movement caused by vibration or shock. have.

Such image stabilization (IS) technology includes an optical image stabilizer (OIS) technology and an image stabilization prevention technology using an image sensor.

OIS technology is a technology that corrects motion by changing the path of light, and image stabilization technology using an image sensor is a technology that compensates movement by mechanical and electronic methods, and OIS technology is being adopted more and more.

On the other hand, a camera module is applied to a vehicle, and it is a product for transmitting images around the vehicle or inside the vehicle to the display, and can be used for a driving assistance system or parking assistance.

In addition, the vehicle camera module detects lanes and vehicles around the vehicle and collects and transmits related data, thereby enabling the ECU to warn or control the vehicle.

On the other hand, in order to obtain the best optical characteristics by using a plurality of zoom lens groups in the camera module, the alignment between the plurality of lens groups and the alignment between the plurality of lens groups and the image sensor must be well matched. However, when the center of the spherical surface between lens groups deviates from the optical axis, tilt, which is a phenomenon of lens inclination, or when the central axis of the lens group and the image sensor are not aligned, the angle of view changes or defocus occurs. This will adversely affect picture quality or resolution.

On the other hand, in the prior art, when an impact is applied to the camera module, a technical problem in which components of the camera module are separated may occur. For example, when a cell phone equipped with a camera module is dropped or in an environment with severe vibration such as a vehicle, when each component of the camera module, for example, a barrel, a housing, a magnet, etc. is detached, not only mechanical reliability but also thrust, It can cause big problems such as precision and control.

On the other hand, as described above, the camera module can be applied to a vehicle along with a radar and used in an advanced driver assistance system (ADAS), which is not only for the convenience of the driver, but also for the safety or life of the driver or pedestrian. can have a big impact.

When the camera module is applied to the advanced driver assistance system (ADAS) of a vehicle, OIS technology is more important due to the vibration of the vehicle, and the precision of OIS data can be directly related to the safety or life of drivers or pedestrians.

In addition, when implementing AF or Zoom, a plurality of lens assemblies are driven by electromagnetic force between magnets and coils, but there is a problem in that magnetic field interference occurs between magnets mounted on each lens assembly. Due to magnetic field interference between these magnets, AF or zoom operation is not properly performed, so there is a problem in that thrust is lowered. Also, there is a problem of causing a decent or tilt phenomenon due to magnetic field interference between magnets.

If there is an issue in the precision of camera control or the thrust is lowered due to such magnetic field interference, or if a decent or tilt phenomenon is caused, it may directly affect the safety or life of a user, a driver or a pedestrian.

Meanwhile, in the related camera module technology, a spring structure is applied to the existing AF structure. However, such a spring structure is vulnerable to high-frequency vibration, has high driving resistance due to the rigidity of the spring, and has technical problems in that dynamic tilt occurs.

On the other hand, the content described in the item merely provides background information and does not constitute the prior art.

One of the technical problems of the embodiment is to provide a lens driving device capable of solving the technical problem that components of the lens driving device are separated when an impact is applied to the camera module, and a camera module including the same.

In addition, the embodiment provides a lens driving device capable of solving technical problems in which a high-frequency vibration is generated according to a spring structure in the AF structure of the camera module, a driving resistance is increased, and a dynamic tilt occurs, and a camera module including the same is intended to provide

In addition, one of the technical problems of the embodiment is to provide a lens driving device capable of preventing magnetic field interference between magnets when implementing AF or OIS, and a camera module including the same.

The technical problems of the embodiments are not limited to those described in this item, and include those that can be grasped from the entire description of the invention.

The lens driving apparatus according to the embodiment may include a bobbin in which a lens is disposed, a first housing in which the bobbin is disposed, and a first guide member disposed between the bobbin and the first housing. The first housing may have a first guide groove in which the first guide member is disposed, and the first guide groove may have an asymmetrical shape.

The bobbin may include a second guide groove in which the first guide member is disposed.

The second guide groove may have a shape corresponding to an outer circumferential surface of the first guide member.

The first guide groove may include a first guide surface and a second guide surface that can be in contact with the first guide member.

An angle formed by the first guide surface and the second guide surface may be an acute angle.

Embodiments may include a second housing accommodating the first housing.

The first housing may include a first outer surface facing the second housing.

The second housing may include a second inner surface facing the first housing.

The first outer surface and the second inner surface may include a curved surface in which a central portion is convex outwardly than an upper portion and a lower portion.

The embodiment may include a second guide member disposed between the first outer surface and the second inner surface.

The embodiment may include a first magnet disposed in the first housing, and the first guide member may be in close contact with the first guide groove by a magnetic force of the first magnet.

The first guide member and the second guide member may have different shapes.

The first guide member may have a cylindrical shape, and the second guide member may have a ball shape.

Also, the lens driving apparatus according to the embodiment may include a bobbin on which a lens is disposed, a first housing on which the bobbin is disposed, and a plurality of first guide members disposed between the bobbin and the first housing.

At least one of the plurality of first guide members may be a magnetic material and at least another may be a non-magnetic material.

Among the plurality of first guide members, a first guide member disposed on one side of the bobbin may be a magnetic material, and a first guide member disposed on the other side of the bobbin may be made of a non-magnetic material.

The first housing may have a plurality of first guide grooves in which the first guide member is disposed, and the bobbin may include a plurality of second guide grooves in which the first guide member is disposed.

The first guide member may be in contact with the first guide groove.

Also, the lens driving device according to the embodiment may include a bobbin on which a lens is disposed, a first housing on which the bobbin is disposed, and a first guide member disposed between the bobbin and the first housing.

The first housing has a first guide groove in which the first guide member is disposed, and when the first guide groove is in contact with the first guide member, an angle between two tangent lines in contact with the first guide member is 90° may be smaller than

The first guide groove may have a first guide surface and a second guide surface that can contact the first guide member.

An angle formed by the first guide surface and the second guide surface may be an acute angle.

The bobbin may include a second guide groove in which the first guide member is disposed.

The second guide groove may have a shape corresponding to an outer circumferential surface of the first guide member.

The bobbin may include a bobbin frame in which the second guide groove is formed and a first recess inward from the outermost portion of the bobbin frame.

The first housing may include a first guide protrusion protruding from the first housing frame toward the bobbin.

The first guide protrusion may be disposed on a first recess of the bobbin.

The first guide protrusion may be disposed lower than an outermost portion of the bobbin frame.

The first guide protrusion of the first housing may overlap the bobbin in a circumferential direction.

Also, the lens driving device according to the embodiment may include a bobbin on which a lens is disposed, a first housing on which the bobbin is disposed, and a first guide member disposed between the bobbin and the first housing.

The bobbin has a second guide groove in which the first guide member is disposed, the first housing has a first guide groove in which the first guide member is disposed, and a first guide protrusion forming the first guide groove and may have a step formed on the bobbin to correspond to .

The step of the bobbin may include a first recess formed inward from the outermost portion of the bobbin frame in which the second guide groove is formed.

The first guide protrusion may be disposed on the first recess of the bobbin.

The camera module according to the embodiment may include any one of the above lens driving devices.

According to the lens driving device and the camera module including the same according to the embodiment, when an impact is applied to the camera module, it is possible to solve the technical problem that the components of the lens driving device are separated.

For example, according to the embodiment, the first guide groove GH1 may be provided in the first housing 300 , and the second guide groove GH2 may be provided in the bobbin 200 .

In the embodiment, the first guide member 220 for driving the AF of the lens is disposed between the first guide groove GH1 and the second guide groove GH2, and the first guide groove GH1 and the second guide groove GH2. 2 The guide groove (GH2) may function as a guide rail.

In this case, the first guide member 220 may be disposed. The first guide groove GH1 may have an asymmetric shape.

For example, the second guide groove GH2 may have a shape corresponding to the outer peripheral surface of the first guide member 220 . For example, the second guide groove GH2 may have a curved shape corresponding to the outer peripheral surface of the first guide member 220 .

In addition, the first guide groove GH1 may include a first guide surface 311 and a second guide surface 312 that can contact the first guide member 220 . The first guide surface 311 and the second guide surface 312 may be flat.

In an embodiment, the angle Θ formed by the first guide surface 311 and the second guide surface 312 may be an acute angle.

According to the embodiment, the first guide groove GH1 in which the first guide member 220 is disposed has an asymmetric shape, thereby preventing the first guide member 220 from being separated even when an impact occurs. Friction has the technical effect of providing a movement path for the lens to move.

In addition, in the embodiment, the angle Θ formed by the first guide surface 311 and the second guide surface 312 may be an acute angle. There is a technical effect that can prevent departure.

In addition, in the embodiment, the bobbin 200 may include the bobbin frame 212 in which the second guide groove GH2 is formed and the first recess R1 inward from the outermost 214 of the bobbin frame. The first housing 300 may include a first guide protrusion 315 protruding from the first housing frame 310 toward the bobbin 200 , and the first guide protrusion 315 may include the bobbin 200 . ) may be disposed on the first recess R1. The first guide protrusion 315 may be disposed lower than the outermost 214 of the bobbin 200 . Through this, the separation of the first guide member 220 can be effectively prevented.

In addition, the lens driving device and the camera module including the same according to the embodiment prevent the detachment of the first guide member 220 when implementing AF, zooming or OIS, so that the AF and OIS implementation for the lens become precise, so that the lens de-center ( It has a technical effect of remarkably improving image quality and resolution by solving the problem of decenter) or tilting, so that the alignment between a plurality of lens groups is well aligned, preventing changes in the angle of view or defocusing.

In addition, according to the embodiment, it is possible to solve the problem of high-frequency vibration generation according to the spring structure in the AF structure, the increase in driving resistance, and the technical problem in which the dynamic tilt occurs.

For example, according to the embodiment, it is possible to provide a structure that allows the lens to move with minimal friction and tilt by removing a spring vulnerable to high-frequency vibration from the AF structure and applying a guide shaft.

For example, in the embodiment, among the plurality of first guide members 220 , the 1-1 guide member 220A disposed on one side of the bobbin 200 is a magnetic material, and is disposed on the other side of the bobbin 200 . The 1-2 guide member 220B may be a non-magnetic material.

The 1-1 guide member 220A is a magnetic material and may move up and down in a point contact state with the first housing 300 by the attraction of a magnet.

According to the embodiment, as the first guide member 220 for AF driving is disposed between the first guide groove GH1 and the second guide groove GH2, there is no vibration due to high frequency by removing the spring structure compared to the prior art. Since there is no spring structure, driving resistance is low, power consumption is lowered, and there is a technical effect with less dynamic tilt compared to the guide bearing structure.

In addition, according to the embodiment, there is a technical effect of preventing magnetic field interference between magnets when implementing AF or OIS.

For example, in the prior art, there is a problem in that the AF driving or the OIS driving is not properly performed due to magnetic field interference between the magnet for driving the AF and the magnet for driving the OIS, so that the thrust is lowered. Also, there is a problem of causing a decent or tilt phenomenon due to magnetic field interference between magnets.

According to the embodiment, there is a technical effect of providing a lens driving device capable of preventing magnetic field interference between magnets by different arrangement positions of a magnet for driving OIS and a magnet for driving AF, and a camera module including the same.

The technical effects of the embodiments are not limited to those described in this item, and include those that can be understood from the entire description of the invention.

1A is a perspective view of a camera module according to an embodiment;
1B is a detailed perspective view of a camera module according to the embodiment shown in FIG. 1A;
FIG. 2A is a perspective view of a lens driving device in the camera module according to the embodiment shown in FIG. 1; FIG.
2B is an exploded view of a lens driving device in the camera module according to the embodiment shown in FIG. 2A;
3A is a plan view of the lens driving device according to the embodiment shown in FIG. 2A;
Fig. 3B is a cross-sectional view taken along line A1-A2 of the lens driving device according to the embodiment shown in Fig. 3A;
4 is a perspective view of a lens driving device according to the embodiment shown in FIG. 2A;
Fig. 5 is a side cross-sectional view of the lens driving device according to the embodiment shown in Fig. 4 taken along line B1-B2 perpendicular to the z-axis.
4 is a perspective view of a lens driving device in the camera module according to the embodiment shown in FIG. 1 ;
5 is a side cross-sectional view taken along the line B1-B2 of the lens driving device in the camera module according to the embodiment shown in FIG.
FIG. 6A is an enlarged view of a first area in a cross-sectional side view of the lens driving device according to the embodiment shown in FIG. 5;
Fig. 6B is a first detail view of Fig. 6A, Fig. 6C is a second detail view of Fig. 6A, and Fig. 6D is a third detail view of Fig. 6A.
FIG. 7 is an enlarged view of a second area P2 in the lens driving device according to the embodiment shown in FIG. 5 .
8 is a side cross-sectional view of the lens driving device according to the embodiment shown in FIG. 5;
9 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied;
10 is a perspective view of a vehicle to which a camera module according to an embodiment is applied;

Hereinafter, an embodiment will be described in detail with reference to the accompanying drawings. Since the embodiment can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the embodiment to a specific disclosed form, and should be understood to include all modifications, equivalents, and substitutions included in the spirit and scope of the embodiment.

Terms such as “first” and “second” may be used to describe various elements, but the elements should not be limited by the terms. These terms are used for the purpose of distinguishing one component from another. In addition, terms specifically defined in consideration of the configuration and operation of the embodiment are only for describing the embodiment, and do not limit the scope of the embodiment.

In the description of the embodiment, in the case where it is described as being formed in "up (up)" or "below (on or under)" of each element, on (on or under) ) includes both elements in which two elements are in direct contact with each other or one or more other elements are disposed between the two elements indirectly. In addition, when expressed as "up (up)" or "down (on or under)", it may include not only the upward direction but also the meaning of the downward direction based on one element.

Also, as used hereinafter, relational terms such as "upper/upper/above" and "lower/lower/below" etc. do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It may be used to distinguish one entity or element from another entity or element.

(Example)

Hereinafter, specific features of the camera module according to the embodiment will be described in detail with reference to the drawings.

1A is a perspective view of a camera module 1000 according to an embodiment, and FIG. 1B is a detailed perspective view of the camera module 1000 according to the embodiment shown in FIG. 1A .

In the direction of the x-y-z axis shown in FIG. 1A , the z-axis means an optical axis direction or a direction parallel thereto, the xy-plane represents the ground perpendicular to the z-axis, and the x-axis is perpendicular to the z-axis in the paper (xy plane). direction, and the y-axis may mean a direction perpendicular to the x-axis on the ground.

The camera module 1000 according to the embodiment may be a module tilting method in which the lens 100 and the image sensor (not shown) move integrally to realize OIS. Meanwhile, when the AF is driven, only the lens 100 moves while the image sensor is fixed to change the distance to the image sensor.

Referring to FIG. 1A , the camera module 1000 according to the embodiment includes a circuit board 50 , a bobbin 200 disposed on the circuit board 50 and a lens 100 disposed therein, and the bobbin 200 . ) may include a first housing 300 in which is disposed and a second housing 400 in which the first housing 300 is disposed.

A plurality of the second housing 400 may be disposed outside the first housing 300 . For example, four second housings 400 may be disposed at the outer corners of the first housing 300 , but the present invention is not limited thereto.

The circuit board 50 may be a PCB, flexible printed circuit boards (FPCBs), or rigid flexible printed circuit boards (RFPCBs).

Next, referring to FIG. 1B , the embodiment may include a plurality of coil substrates 52 electrically connected to the circuit board 50 and disposed in the second housing 400 . A second coil unit CL2 and a third coil unit CL3 may be disposed on the coil substrate 52 .

For example, the coil substrate 52 may be disposed in each of the four second housings 400 , and a second coil unit CL2 and a third coil unit CL3 are disposed in each coil substrate 52 , respectively. may be, but is not limited thereto.

Also, in the embodiment, the second magnet part MN2 may be disposed in the second housing 400 . For example, the second magnet part MN2 may be disposed in each of the four second housings 400 .

According to the embodiment, OIS driving may be possible by electromagnetic force between the second magnet part MN2 and the second coil part CL2.

Also, according to an embodiment, the first magnet part MN1 may be disposed in the area of the first housing 300 corresponding to the third coil part CL3 (refer to FIG. 2B ). According to the embodiment, OIS driving may be possible by electromagnetic force between the first magnet part MN1 and the third coil part CL3. The first magnet part MN1 may also function as an AF driving function as will be described later. For example, a part of the first magnet part MN1 may contribute to OIS driving, and another part of the first magnet part MN1 may contribute to AF driving (refer to the description of FIG. 3B below). .

Next, FIG. 2A is a perspective view of the lens driving device 1010 in the camera module according to the embodiment shown in FIG. 1 , and FIG. 2B is an exploded view of the lens driving device 1010 in the camera module according to the embodiment shown in FIG. 2A . to be.

2A and 2B , the lens driving device 1010 according to the embodiment includes a bobbin 200 on which a lens 100 is disposed, a first housing 300 on which the bobbin 200 is disposed, and the bobbin. A first guide member 220 disposed between the 200 and the first housing 300 may be included.

Also, referring to FIG. 2B , the lens driving apparatus 1010 according to the embodiment may include a first coil unit CL1 disposed around the bobbin 200 .

In addition, in the lens driving device 1010 according to the embodiment, the first housing 300 includes an outer frame 310 disposed around the outer periphery of the bobbin 200 and a protrusion 320 protruding from the outer frame 310 . can do. The protrusion 320 may be provided in plurality.

For example, four protrusions 320 may protrude in the direction of the second housing 400 , but the present invention is not limited thereto.

In addition, the lens driving device 1010 according to the embodiment includes a first magnet part MN1 disposed on the outer frame 310 and a second magnet part MN2 disposed on the protrusion 320 of the outer frame 310 . can do.

In an embodiment, the AF may be driven by the interaction between a part of the first magnet part MN1 and the first coil part CL1 .

In addition, OIS driving may be possible by the interaction between the second magnet part MN2 and the second coil part CL2 .

In addition, OIS driving may be possible by interaction between another part of the first magnet part MN1 and the third coil part CL3 (refer to the description of FIG. 3B ).

Next, FIG. 3A is a plan view of the lens driving device 1010 according to the embodiment shown in FIG. 2A , and FIG. 3B is a cross-sectional view taken along line A1-A2 of the lens driving device 1010 according to the embodiment shown in FIG. 3A . to be.

As shown in FIG. 3B , AF driving is possible by the interaction between the first magnet part MN1 and the first coil part CL1 disposed on the bobbin 200 , and the lens according to the movement of the bobbin 200 . (100) may be moved up and down in the optical axis direction.

In this case, the first magnet part MN1 may include a positively-polarized magnet.

For example, the first magnet part MN1 may include a 1-1 magnet MN1a and a 1-2 magnet MN1b. The 1-1 magnet MN1a may correspond to the first coil part CL1.

In the embodiment, AF may be driven as long as the vertical width and length of the 1-1 magnet MN1a, but the present invention is not limited thereto. The first-second magnet MN1b may contribute to driving the OIS by interaction with the third coil unit CL3.

Next, FIG. 4 is a perspective view of the lens driving device 1010 according to the embodiment shown in FIG. 2A , and FIG. 5 is a lens driving device 1010 according to the embodiment shown in FIG. 4 perpendicular to the z-axis B1-B2. It is a side cross-sectional view along a line.

Referring to FIG. 5 , the lens driving device 1010 according to the embodiment includes a bobbin 200 on which a lens 100 is disposed, a first housing 300 on which the bobbin 200 is disposed, and the bobbin 200 . and a first guide member 220 disposed between the first housing 300 .

The first guide member 220 may be disposed in plurality. For example, four first guide members 220 disposed between the bobbin 200 and the first housing 300 may be included, but the present invention is not limited thereto.

The first guide member 220 may have a shaft shape, but is not limited thereto.

Next, FIG. 6A is an enlarged view of the first region P1 in a cross-sectional side view of the lens driving device 1010 according to the embodiment shown in FIG. 5 , FIG. 6B is a first detailed view of FIG. 6A , and FIG. 6C is It is a second detailed view of FIG. 6A , and FIG. 6D is a third detailed view of FIG. 6A .

For example, FIG. 6B is a first detailed view in which the first guide member 220 is omitted from an enlarged view of the first region P1 in a sectional side view of the lens driving device 1010 according to the embodiment shown in FIG. 6A . 6C is a second detailed view in which the first guide member 220 is omitted from the enlarged view of the first region P1 in the cross-sectional side view of the lens driving device 1010 according to the embodiment shown in FIG. 6A .

First, referring to FIG. 6A , in the embodiment, the first housing 300 may include a first guide groove GH1 in which the first guide member 220 is disposed. The first guide groove GH1 may have an asymmetric shape.

Also, the bobbin 200 may include a second guide groove GH2 in which the first guide member 220 is disposed. The second guide groove GH2 may have a shape corresponding to the outer peripheral surface of the first guide member 220 . For example, the second guide groove GH2 may have a curved shape corresponding to the outer peripheral surface of the first guide member 220 .

Specifically, referring to FIG. 6B , the first housing 300 includes a housing frame 310 , and the first guide groove GH1 may be formed inside the first housing frame 310 .

The first guide groove GH1 has a first guide surface 311 and a second guide surface 312 that can be in contact with the first guide member 220, and the first guide surface 311 and The angle Θ formed by the second guide surface 312 may be an acute angle.

In addition, the first guide groove GH1 may include a first guide surface 311 and a second guide surface 312 that can contact the first guide member 220 . The first guide surface 311 and the second guide surface 312 may be flat.

According to the lens driving device and the camera module including the same according to the embodiment, it is possible to solve the technical problem that the lens driving device is separated when an impact is applied to the camera module.

For example, in the embodiment, the first guide member 220 for driving the AF of the lens is disposed between the first guide groove GH1 and the second guide groove GH2, and the first guide groove GH1 ) and the second guide groove GH2 may function as a guide rail.

According to the embodiment, the first guide groove GH1 in which the first guide member 220 is disposed has an asymmetric shape, thereby preventing the first guide member 220 from being separated even when an impact occurs. Friction has the technical effect of providing a movement path for the lens to move.

In addition, in the embodiment, the angle Θ formed by the first guide surface 311 and the second guide surface 312 may be an acute angle. There is a technical effect that can prevent departure.

Specifically, referring to FIG. 6C , a first line L1 extending from the first guide surface 311 in the first guide groove GH1 and a second line L2 extending from the second guide surface 312 . ), the angle Θ formed by the first guide surface 311 and the second guide surface 312 may be an acute angle.

The first line L1 and the second line L2 may be one of tangent lines to the first guide member 220 .

According to the embodiment, by controlling the angle formed between the first guide surface 311 and the second guide surface 312 in the first guide groove GH1 of the first housing 300 to an acute angle, the impact to the camera module is When applied, it is possible to solve the technical problem that the first guide member 220 is separated.

Next, referring to FIG. 6D , the bobbin 200 includes a bobbin frame 212 in which the second guide groove GH2 is formed and a first recess R1 inwardly from the outermost 214 of the bobbin frame. can

The first housing 300 may include a first guide protrusion 315 protruding from the first housing frame 310 toward the bobbin 200 , and the first guide protrusion 315 may include the bobbin 200 . ) may be disposed on the first recess R1.

The first guide protrusion 315 may be disposed lower than the outermost 214 of the bobbin 200 . Through this, the separation of the first guide member 220 can be effectively prevented.

For example, the first guide protrusion 315 of the first housing 300 protrudes in the direction of the bobbin 200 , and is disposed to protrude up to the first recess R1 of the bobbin 200 . Even in such a situation, the first guide sub-barrier 220 is not separated and can be firmly positioned in the first guide groove GH1 and the second guide groove GH2, and reliability can be improved by preventing the AF module from being separated by impact. .

Next, FIG. 7 is an enlarged view of the second area P2 in the lens driving device according to the embodiment shown in FIG. 5 .

According to the embodiment, the first distance D1 between the edges of the adjacent first guide groove GH1 is greater than the second distance D2 between both ends of the first guide protrusion 315 of the first housing 300 . can

The first distance D1 may be a distance from the upper end of the first upper guide member 220a1 disposed on the upper side of the first guide member 220 to the lower end of the first lower guide member 220b disposed at the lower side. have.

Also, the second distance D2 may be a distance between the first guide protrusion 315 on one side and the first guide protrusion 315 on the other side in the adjacent first guide groove GH1 .

According to the embodiment, the first distance D1 between the edges of the adjacent first guide groove GH1 is the second distance D2 between both ends of the first guide protrusion 315 of the first guide groove GH1 adjacent to each other. By designing larger, there is a technical effect that can contribute to reliability by preventing the separation of the first guide member 220 even in a situation such as an impact.

In addition, the lens driving device and the camera module including the same according to the embodiment prevent the detachment of the first guide member 220 when implementing AF, zooming or OIS, so that the AF and OIS implementation for the lens become precise, so that the lens de-center ( It has a technical effect of remarkably improving image quality and resolution by solving the problem of decenter) or tilting, so that the alignment between a plurality of lens groups is well aligned, preventing changes in the angle of view or defocusing.

Also, referring to FIG. 7 , the bobbin 200 according to the embodiment may include the second recess R2 in a region corresponding to the first magnet MN1 disposed in the first housing 300 . The second recess R2 may be disposed between adjacent second guide grooves GH2 .

Also, the second recess R2 may be disposed between the adjacent first guide grooves GH1 .

Accordingly, the second recess R2 may be disposed between the adjacent first guide members 220 .

According to the embodiment, as the second recess R2 is disposed in the bobbin 200 , the electromagnetic force between the first magnet MN1 and the first coil unit CL1 may be improved, and the weight of the bobbin 200 may be reduced. driving force may be improved accordingly.

(Second embodiment)

Next, FIG. 8 is a side cross-sectional view of the lens driving device according to the embodiment shown in FIG. 5 .

The lens driving device 1010 according to the embodiment may include a first guide member 220 composed of a magnetic material and a non-magnetic material.

For example, at least one of the plurality of first guide members 220 may be a magnetic material and at least the other may be a non-magnetic material.

Among the plurality of first guide members 220 , a first-first guide member 220A disposed on one side of the bobbin 200 may be a magnetic material, and a first-second guide member 220A disposed on the other side of the bobbin 200 . The guide member 220B may be a non-magnetic material.

For example, the first-first guide member 220A may include a first-first magnetic shaft 220a1 and a first-second magnetic shaft 220a2. The 1-2 th guide member 220B may include a 2-1 th non-magnetic shaft 220b1 and a 2-2 th non-magnetic shaft 220b2.

The 1-1 guide member 220A may contact the first guide groove GH1 of the first housing 300 by attractive force between magnetic bodies.

The 1-2 guide member 220B may have a predetermined gap, for example, 0.03 mm for the purpose of reducing mechanical tolerance and frictional force, but is not limited thereto.

According to the embodiment, it is possible to solve the problem of high-frequency vibration generation according to the spring structure in the AF structure, the increase in driving resistance, and the technical problem in which the dynamic tilt occurs.

For example, according to the embodiment, it is possible to provide a structure that allows the lens to move with minimal friction and tilt by removing a spring vulnerable to high-frequency vibration from the AF structure and applying a guide shaft.

For example, in the embodiment, among the plurality of first guide members 220 , the 1-1 guide member 220A disposed on one side of the bobbin 200 is a magnetic material, and is disposed on the other side of the bobbin 200 . The 1-2 guide member 220B may be a non-magnetic material.

The 1-1 guide member 220A is a magnetic material and may move up and down in a point contact state with the first housing 300 by the attractive force of a magnet.

According to the embodiment, as the first guide member 220 for AF driving is disposed between the first guide groove GH1 and the second guide groove GH2, there is no vibration due to high frequency by removing the spring structure compared to the prior art. Since there is no spring structure, driving resistance is low, power consumption is lowered, and there is a technical effect of less dynamic tilt compared to the guide bearing structure.

Also, according to the embodiment, there is a technical effect of preventing magnetic field interference between magnets when implementing AF or OIS. For example, in the prior art, there is a problem in that the AF driving or OIS driving is not properly performed due to magnetic field interference between the magnet for driving the AF and the magnet for driving the OIS, so that thrust is lowered. Also, there is a problem of causing a decent or tilt phenomenon due to magnetic field interference between magnets.

According to the embodiment, a lens driving device capable of preventing magnetic field interference between magnets by changing the arrangement positions of the second magnet part MN2 for driving OIS and the first magnet part MN1 for driving AF, and a camera including the same There is a technical effect that can provide a module.

Referring briefly to FIG. 1B , the embodiment may include a second housing 400 accommodating the first housing 300 . The first housing 300 includes a first housing outer surface (not shown) facing the second housing 400 , and the second housing 400 includes a first housing 300 facing the first housing 300 . 2 may include an inner surface (not shown) of the housing.

The outer surface of the first housing and the inner surface of the second housing may include curved surfaces having central portions convex outwardly than upper and lower portions. In an embodiment, OIS may be implemented through a curved surface.

In addition, the embodiment may include a second guide member (not shown) disposed between the outer surface of the first housing and the inner surface of the second housing.

In an embodiment, the first guide member 220 and the second guide member may have different shapes. For example, the first guide member 220 may have a cylindrical shape, and the second guide member may have a ball shape. The second guide member may be a bearing, but is not limited thereto.

Next, FIG. 9 is a mobile terminal 1500 to which a camera module according to an embodiment is applied.

As shown in FIG. 9 , the mobile terminal 1500 of the embodiment may include a camera module 1000 , a flash module 1530 , and an autofocus device 1510 provided on the rear side. The mobile terminal 1500 of the embodiment may further include a second camera module 1100 .

The camera module 1000 may include an image capturing function and an auto focus function. For example, the camera module 1000 may include an auto-focus function using an image.

The camera module 1000 processes an image frame of a still image or a moving image obtained by an image sensor in a shooting mode or a video call mode. The processed image frame may be displayed on a predetermined display unit and stored in a memory. A camera (not shown) may also be disposed on the front of the mobile terminal body.

For example, the camera module 1000 may include a first camera module and a second camera module, and OIS may be implemented together with an AF or zoom function by the first camera module.

The flash module 1530 may include a light emitting device emitting light therein. The flash module 1530 may be operated by a camera operation of a mobile terminal or a user's control.

The autofocus device 1510 may include one of the packages of the surface light emitting laser device as a light emitting part.

The auto focus device 1510 may include an auto focus function using a laser. The autofocus device 1510 may be mainly used in a condition in which the autofocus function using the image of the camera module 1000 is deteriorated, for example, in proximity of 10 m or less or in a dark environment. The autofocus device 1510 may include a light emitting unit including a vertical cavity surface emitting laser (VCSEL) semiconductor device and a light receiving unit that converts light energy such as a photodiode into electrical energy.

Next, FIG. 10 is a perspective view of a vehicle 700 to which a camera module according to an embodiment is applied.

For example, FIG. 10 is an external view of a vehicle including a vehicle driving assistance device to which the camera module 1000 according to the embodiment is applied.

Referring to FIG. 10 , the vehicle 700 according to the embodiment may include wheels 13FL and 13FR that rotate by a power source and a predetermined sensor. The sensor may be the camera sensor 2000, but is not limited thereto.

The camera 2000 may be a camera sensor to which the camera module 1000 according to the embodiment is applied.

The vehicle 700 of the embodiment may acquire image information through a camera sensor 2000 that captures a front image or a surrounding image, and determines a lane unidentified situation using the image information and generates a virtual lane when unidentified can do.

For example, the camera sensor 2000 may acquire a front image by photographing the front of the vehicle 700 , and a processor (not shown) may obtain image information by analyzing an object included in the front image.

For example, when an object such as a median, curb, or street tree corresponding to a lane, an adjacent vehicle, a driving obstacle, and an indirect road mark is captured in the image captured by the camera sensor 2000, the processor detects the object to be included in the video information.

In this case, the processor may further supplement the image information by acquiring distance information from the object detected through the camera sensor 2000 . The image information may be information about an object photographed in an image.

The camera sensor 2000 may include an image sensor and an image processing module. The camera sensor 2000 may process a still image or a moving image obtained by an image sensor (eg, CMOS or CCD). The image processing module may process a still image or a moving image obtained through the image sensor, extract necessary information, and transmit the extracted information to the processor.

In this case, the camera sensor 2000 may include a stereo camera to improve the measurement accuracy of the object and further secure information such as the distance between the vehicle 700 and the object, but is not limited thereto.

The vehicle 700 of an embodiment may provide an advanced driver assistance system (ADAS).

For example, advanced driver assistance systems (ADAS) include Autonomous Emergency Braking (AEB), which slows or stops by itself without the driver stepping on the brake in the event of a collision, and adjusts the driving direction in case of lane departure. Lane Keep Assist System (LKAS), Advanced Smart Cruise Control (ASCC), which maintains a distance from the vehicle in front while driving at a preset speed, and There are Active Blind Spot Detection (ABSD) and Around View Monitor (AVM) that visually shows the surroundings of the vehicle.

In this advanced driver assistance system (ADAS), the camera module functions as a core part together with radar, and the proportion of the camera module application is gradually increasing.

For example, in the case of an automatic emergency braking system (AEB), a front camera sensor and a radar sensor can detect a vehicle or pedestrian in front and automatically provide emergency braking when the driver does not control the vehicle. Alternatively, in the case of the Driving Steering Assist System (LKAS), the camera sensor detects whether the driver leaves the lane without manipulation, such as direction indication, and automatically steers the steering wheel to maintain the lane. In addition, in the case of an Around View Monitoring System (AVM), it is possible to visually show the surroundings of the vehicle through camera sensors placed on all sides of the vehicle.

Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment, and are not necessarily limited to only one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the embodiments.

In the above, the embodiment has been mainly described, but this is only an example and not limiting the embodiment, and those of ordinary skill in the art to which the embodiment belongs may have several examples not illustrated above in the range that does not depart from the essential characteristics of the embodiment. It can be seen that the transformation and application of branches are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the embodiments set forth in the appended claims.

Claims (24)

a bobbin on which the lens is disposed;
a first housing in which the bobbin is disposed; and
a first guide member disposed between the bobbin and the first housing;
The first housing has a first guide groove in which the first guide member is disposed,
The first guide groove has an asymmetric shape. The method of claim 1,
The bobbin is a lens driving device having a second guide groove in which the first guide member is disposed. 3. The method of claim 2,
The second guide groove has a shape corresponding to the outer peripheral surface of the first guide member,
The first guide groove has a first guide surface and a second guide surface that can be in contact with the first guide member,
An angle formed by the first guide surface and the second guide surface is an acute angle. The method of claim 1,
a second housing accommodating the first housing;
the first housing comprises a first outer surface facing the second housing;
the second housing includes a second inner surface facing the first housing;
The first outer surface and the second inner surface may include a curved surface in which a central portion is convex outwardly than an upper portion and a lower portion thereof. 5. The method of claim 4,
and a second guide member disposed between the first outer surface and the second inner surface. The method of claim 1,
A first magnet disposed in the first housing,
A lens driving device in which the first guide member is in close contact with the first guide groove by the magnetic force of the first magnet. 6. The method of claim 5,
The first guide member and the second guide member have different shapes. 8. The method of claim 7,
The first guide member has a cylindrical shape, and the second guide member has a ball shape. a bobbin on which the lens is disposed;
a first housing in which the bobbin is disposed; and
A plurality of first guide members disposed between the bobbin and the first housing,
At least one of the plurality of first guide members is a magnetic material and at least the other is a non-magnetic material. 10. The method of claim 9,
A first guide member disposed on one side of the bobbin among the plurality of first guide members is a magnetic material, and the first guide member disposed on the other side of the bobbin is a non-magnetic material. 10. The method of claim 9,
The first housing has a plurality of first guide grooves in which the first guide member is disposed,
The bobbin is a lens driving device having a plurality of second guide grooves in which the first guide member is disposed. 11. The method of claim 10,
The first guide member is a lens driving device in contact with the first guide groove. a bobbin on which the lens is disposed;
a first housing in which the bobbin is disposed; and
a first guide member disposed between the bobbin and the first housing;
The first housing has a first guide groove in which the first guide member is disposed,
When the first guide groove is in contact with the first guide member, an angle between two tangent lines in contact with the first guide member is less than 90°. 14. The method of claim 13,
The first guide groove has a first guide surface and a second guide surface that can be in contact with the first guide member,
An angle formed by the first guide surface and the second guide surface is an acute angle. 14. The method of claim 13,
The bobbin has a second guide groove in which the first guide member is disposed,
The second guide groove has a shape corresponding to an outer circumferential surface of the first guide member. 16. The method of claim 15,
wherein the bobbin includes a bobbin frame in which the second guide groove is formed and a first recess inwardly from an outermost part of the bobbin frame. 17. The method of claim 16,
The first housing includes a first guide protrusion protruding from the first housing frame toward the bobbin. 18. The method of claim 17,
and the first guide protrusion is disposed on a first recess of the bobbin. 18. The method of claim 17,
The first guide protrusion is arranged to be lower than the outermost part of the bobbin frame. 18. The method of claim 17,
The first guide protrusion of the first housing overlaps the bobbin in a circumferential direction. a bobbin on which the lens is disposed;
a first housing in which the bobbin is disposed; and
a first guide member disposed between the bobbin and the first housing;
The bobbin has a second guide groove in which the first guide member is disposed,
The first housing has a first guide groove in which the first guide member is disposed,
A lens driving device having a step difference formed on the bobbin to correspond to a first guide protrusion forming the first guide groove. 22. The method of claim 21,
The step of the bobbin
and a first recess formed inward from the outermost portion of the bobbin frame in which the second guide groove is formed. 23. The method of claim 22,
and the first guide protrusion is disposed on the first recess of the bobbin. 23. A camera module comprising a lens driving device according to any one of claims 1 to 22.

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