KR20220162534A - Lens barrel and camera module including the same - Google Patents

Abstract

A camera module disclosed in an embodiment of the invention may include: a first lens barrel having an accommodation part with an open upper portion and at least one lens; a second lens barrel disposed in the accommodating part of the first lens barrel and having at least one lens; a plurality of ball bearings disposed between a bottom part of the first lens barrel and a bottom of the second lens barrel; and first and second driving units disposed on both sides between the bottom part of the first lens barrel and the bottom of the second lens barrel. The first and second driving units may move the second lens barrel in an optical axis direction along the ball bearings.

Description

A lens barrel and a camera module including the same {LENS BARREL AND CAMERA MODULE INCLUDING THE SAME}

An embodiment of the invention relates to a lens barrel and a camera module including the same.

The camera module performs a function of capturing a subject and storing it as an image or video, and is installed in various devices such as mobile terminals such as mobile phones, laptops, drones, and vehicles.

In general, the above-described device is equipped with a subminiature camera module, and the camera module can perform an autofocus (AF) function of aligning the focal length of a lens by automatically adjusting a distance between an image sensor and a lens. In addition, the camera module 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, the camera module employs an image stabilization (IS) technology to correct or prevent image stabilization due to camera movement caused by an unstable fixing device or a user's movement.

Such image stabilization (IS) technology includes an optical image stabilizer (OIS) technology and an image stabilizer technology using an image sensor. Here, 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 corrects motion in a mechanical and electronic way. Recently, OIS technology is being adopted more. The camera module may include a reflective member and a driving unit capable of changing a path of light to implement the OIS function. In detail, the camera module may change the path of light by controlling the position of the reflective member with a driving force applied from the driving unit. As such a driving unit, the position of the reflective member may be controlled by using a driving unit of a voice coil motor (VCM) type including a coil, a magnet, and the like.

Meanwhile, an actuator may be used in the camera module to provide an auto focus or zooming function. For example, the actuator may include a magnet, a coil, a ball bearing, and the like, and may control the position of the lens using a driving force formed by electromagnetic force. However, friction torque is generated when the lens is moved by the mechanical movement of the actuator, and problems such as reduction in driving force, increase in power consumption, and deterioration in control characteristics have occurred due to such friction torque.

Embodiments of the invention seek to provide a novel camera lens barrel.

An embodiment of the present invention is to provide a camera module in which one of a plurality of lens barrels is accommodated inside the other one and is movable in the direction of an optical axis.

An embodiment of the present invention is to provide a camera module capable of providing an auto focus function for subjects located at various distances.

An embodiment of the present invention is to provide a camera module capable of effectively controlling vibrations caused by hand shaking.

Embodiments of the invention are intended to provide a compact camera module.

An embodiment of the invention is to provide a camera module having an auto focus (AF) function.

An embodiment of the present invention is to provide a camera module capable of preventing problems such as decentering, tilting, and friction occurring when any one of a plurality of lens barrels is moved.

A camera module according to an embodiment of the present invention includes a first lens barrel having a housing portion with an open top and at least one lens; a second lens barrel disposed in the accommodating part of the first lens barrel and having at least one lens; a plurality of ball bearings disposed between a bottom of the first lens barrel and a bottom of the second lens barrel; and first and second driving units disposed on both sides between a bottom of the first lens barrel and a bottom of the second lens barrel, wherein the first and second driving units drive the second lens barrel through the ball bearings. can be moved along the optical axis.

According to an embodiment of the invention, the first lens barrel includes a first holder having the at least one lens; a first side surface disposed on one side of the storage unit and a second side surface disposed on the other side of the storage unit; a rear portion covering sensor-side ends of the first and second side portions and having a penetration hole therein; and a bottom portion that is a bottom of the accommodating portion, wherein the second lens barrel is disposed on the bottom portion of the first lens barrel and disposed inside the first and second side surfaces and the rear portion.

According to an embodiment of the invention, the second lens barrel includes a second holder having the at least one lens; and a first side portion extending from one side of the second holder toward the sensor side. and a second side portion extending from the other side of the second holder toward the sensor side, and the first side portion and the second side portion may have the same length in an optical axis direction.

According to an embodiment of the present invention, the plurality of ball bearings include first and second ball bearings disposed on both sides of the lower portion of the first holder, and third and fourth balls disposed at sensor-side ends of the first and second side parts, respectively. Bearings may be included.

According to an embodiment of the present invention, the bottom of the first lens barrel includes first and second guide grooves disposed on both sides of the center of the accommodating unit; and third and fourth guide grooves disposed inside the first and second side parts adjacent to the rear surface, and the first to fourth ball bearings may be disposed in the first to fourth guide grooves, respectively.

According to an embodiment of the present invention, the first holder of the second lens barrel has a first guide portion having a concave groove at a lower portion opposite to a portion of the first guide groove, and a flat portion opposite to a portion of the second guide groove. A second guide part having one surface, the first side part of the second lens barrel having a third guide part opposite to the third guide groove at an end of the sensor side and having a flat lower surface, and the second side part having a sensor side. It may include a fourth guide portion at a side end opposite to the fourth guide groove and having a flat lower surface.

According to an embodiment of the present invention, the third guide part is stepped at a height lower than the upper surface of the first side part, the fourth guide part is stepped lower than the upper surface of the second side part, and the sensor side of the third and fourth guide parts Stop protrusions may be disposed on the surface, respectively.

According to an embodiment of the present invention, the first driving unit may include a first coil disposed on one side of the bottom of the first lens barrel; a first magnet disposed on one side of the bottom of the second lens barrel; and a first yoke disposed under the first coil, wherein the second drive unit includes a second coil disposed on the other side of the bottom of the first lens barrel; a second magnet disposed on the other side of the bottom of the second lens barrel; and a second yoke disposed under the second coil.

A camera module according to an embodiment of the present invention includes a first lens barrel having a first holder having at least one lens and a storage unit with an open top; a second lens barrel disposed in the accommodating part of the first lens barrel and having a second holder holding at least one lens; a plurality of ball bearings disposed between the first lens barrel and the second lens barrel; a driving member moving the second lens barrel in an optical axis direction along the plurality of ball bearings; and an inner cover covering the accommodating portion of the first lens barrel and having a plurality of pressing protrusions therein protruding toward the second lens barrel.

According to an embodiment of the invention, the driving member may include a first driving unit and a second driving unit disposed on one side and the other side of the accommodating unit.

According to an embodiment of the present invention, the first lens barrel includes first and second side parts disposed on both sides of the second lens barrel, a rear part disposed on a sensor side, and a bottom part disposed on a bottom of the second lens barrel. The first holder, the first and second side parts, the rear part, and the bottom part may be integrally formed.

According to an embodiment of the invention, the first and second guide grooves arranged parallel to the optical axis with a first interval at the bottom of the housing unit; and third and fourth guide grooves having a second interval greater than the first interval and disposed parallel to the optical axis, wherein the lengths of the third and fourth guide grooves are lengths of the first and second guide grooves in the optical axis direction. smaller, and the ball bearings may be respectively disposed in the first to fourth guide grooves.

According to an embodiment of the present invention, the number of contact points of the ball bearings disposed in the first guide groove is greater than the number of contact points of the ball bearings disposed in the second guide groove, and the number of contact points of the ball bearings disposed in the third and fourth guide grooves The number of contact points may be the same as each other.

According to an embodiment of the present invention, the first lens barrel protrudes toward the object and includes a first protrusion having a flat top and bottom, and the at least one lens disposed in the first protrusion may have a non-circular shape. have.

A camera module according to an embodiment of the present invention includes a lens module having a plurality of lens barrels; and a reflection module, wherein the lens module performs an auto focusing or zoom function by moving any one of the plurality of lens modules, and the reflection module performs an Optical Image Stabilizer (OIS) function. and the lens module may have the first and second lens barrels.

The camera module according to the embodiment may have improved optical characteristics, a first lens barrel having a fixed lens group and a second lens barrel having a movable lens group may be easily coupled, and assembly between the first and second lens barrels may be performed. gap can be given. The lens module includes yokes corresponding to each of the plurality of magnets, and the second lens barrel can be stably moved by an attractive force between the magnets and the yokes, and lens distortion can be suppressed. In addition, by disposing ball bearings between the bottom of the storage part of the first lens barrel and the bottom of the second lens barrel, it is possible to prevent the ball bearings from moving in the X, Y, and Z directions. Accordingly, the lens module can increase the degree of freedom in terms of size and shape of the first lens barrel, reduce the dispersion of defects, and have improved efficiency.

In addition, the camera module according to the embodiment can effectively control the alignment characteristics of the second lens barrel and the distance from the other lens barrel. Accordingly, the lens module may have improved image quality and resolving power, and may effectively focus on a subject when photographing a subject located at various distances, such as infinity or a short distance (eg, about 30 mm).

In addition, the camera module according to the embodiment can be provided more compactly because it can shoot a subject at a fixed TTL value without increasing the overall length of the optical system when photographing a subject located at infinity or a short distance (about 30 mm). have.

In addition, the camera module according to the embodiment may prevent or minimize lens decentering or tilting during an auto focus (AF) operation. Accordingly, the embodiment can improve align characteristics between a plurality of lens groups, prevent a change in angle of view or occurrence of out-of-focus, and thereby have improved image quality and resolution.

In addition, the camera module according to the embodiment includes a driving unit for controlling the position of the prism, and the position of the prism can be precisely controlled by the driving unit. Accordingly, the embodiment can provide an improved OIS function by effectively controlling vibration caused by hand shaking.

1 is an exploded perspective view of a camera module according to an embodiment of the present invention.
2 is a perspective view of a partial combination of the camera module of FIG. 1;
3 is an AA-side cross-sectional view of the camera module of FIG. 2 .
4 is a BB-side cross-sectional view of the camera module of FIG. 2 .
5 is a perspective view of the first lens barrel of FIG. 1;
FIG. 6 is a combined perspective view of first and second lens barrels of FIG. 1 .
7 is a perspective view of the second lens barrel of FIG. 1;
FIG. 8 is a perspective view showing a bottom side of the second lens barrel of FIG. 7 .
FIG. 9 is a perspective view showing the bottom of the first lens barrel of FIG. 6 .
10 is a side cross-sectional view showing a coupling structure of first and second ball bearings in FIG. 6 .
11 is a side cross-sectional view showing a coupling structure of third and fourth ball bearings in FIG. 6 .
FIG. 12 is a partial side cross-sectional view of a cover coupled to the first lens barrel of FIG. 6 .
13 is a graph illustrating movement of a second lens barrel when the number of ball bearings under the moving lens barrel is two according to a comparative example.
14 is a graph illustrating movement of a second lens barrel according to an embodiment of the present invention.
15 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied.
16 is a perspective view of a vehicle to which a camera module according to an embodiment is applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in a variety of different forms, and if it is within the scope of the technical idea of the present invention, one or more of the components among the embodiments can be selectively selected. can be used by combining and substituting. In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, can be generally understood by those of ordinary skill in the art to which the present invention belongs. It can be interpreted as meaning, and commonly used terms, such as terms defined in a dictionary, can be interpreted in consideration of contextual meanings of related technologies.

Also, terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when described as "at least one (or more than one) of A and (and) B and C", A, B, and C are combined. may include one or more of all possible combinations. Also, terms such as first, second, A, B, (a), and (b) may be used to describe components of an embodiment of the present invention. These terms are only used to distinguish the component from other components, and the term is not limited to the nature, order, or order of the corresponding component. And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected to, combined with, or connected to the other component, but also with the component. It may also include the case of being 'connected', 'combined', or 'connected' due to another component between the other components.

In addition, when it is described as being formed or disposed on the "top (above) or bottom (bottom)" of each component, the top (top) or bottom (bottom) is not only a case where two components are in direct contact with each other, but also one A case in which another component above is formed or disposed between two components is also included. In addition, when expressed as "up (up) or down (down)", it may include the meaning of not only the upward direction but also the downward direction based on one component.

In addition, prior to the description of the embodiment of the invention, the first direction may mean the X-axis direction shown in the drawing, and the second direction may be a direction different from the first direction. For example, the second direction may refer to a Y-axis direction shown in the drawing as a direction perpendicular to the first direction. Further, the third direction may refer to the Z-axis direction shown in the figure, and the third direction may be a direction different from the first and second directions. For example, the third direction may be a direction perpendicular to the first and second directions.

In addition, the X-axis direction, which is the first direction in the X-axis, Y-axis, and Z-axis directions shown in the drawing, may mean an optical axis direction or a direction parallel thereto.

1 is an exploded perspective view of a camera module according to an embodiment of the present invention, FIG. 2 is a partially combined perspective view of the camera module of FIG. 1, FIG. 3 is a cross-sectional view of the camera module of FIG. 2 from the A-A side, and FIG. A B-B side cross-sectional view of the camera module, FIG. 5 is a perspective view of the first lens barrel in FIG. 1, FIG. 6 is a combined perspective view of the first and second lens barrels in FIG. 1, and FIG. 7 is a perspective view of the second lens barrel in FIG. FIG. 8 is a perspective view showing the bottom side of the second lens barrel in FIG. 7, FIG. 9 is a perspective view showing the bottom side of the first lens barrel in FIG. 6, and FIG. 10 is a perspective view showing the first and second ball bearings in FIG. FIG. 11 is a side cross-sectional view showing the coupling structure of the third and fourth ball bearings in FIG. 6, and FIG. 12 is a partial side cross-sectional view of the cover coupled to the first lens barrel of FIG. 6. .

1 to 12 , a camera module 10 according to an embodiment of the present invention may include a plurality of modules. For example, the camera module 10 may include a lens module 1000 , a reflection module 2000 and a sensor module 550 . The lens module 1000 may be disposed between the reflection module 2000 and the sensor module 550 .

The camera module 10 may include a cover 500 covering and protecting the lens module 1000 , the reflection module 2000 , and the sensor module 550 . At least one side surface of the cover 500 may be opened, for example, a bottom surface may be opened so that the lens module 1000 and the reflection module 2000 may be accommodated therein. The sensor module 550 may be accommodated inside the cover 500 .

The cover 500 may be formed of a metal material or a non-metal material, may function as a shield can, and may be an outer cover. The cover 500 may include a first opening 501 opening a portion, eg, an upper portion, of the reflective module 2000, and light may be incident through the first opening 501. Here, the upper part of the reflective module 2000 may be at least one side of the device having the camera module 10, for example, the front or rear surface. The cover 500 may include a second opening 503 exposing at least a portion of the sensor module 550 . The cover 500 may cover the top of the reflective module 2000, and the sensor module 1000 may be covered with another cover.

<Reflection module (2000)>

The reflection module 2000 may change a path of light incident on the camera module 10 . The reflection module 2000 may be an Optical Image Stabilizer (OIS) actuator. In this case, light incident on the camera module 10 from the outside may be incident on the reflection module 2000 first. In addition, the light incident on the reflective module 2000 may be incident on the lens module 1000 by changing a light path. Subsequently, the light passing through the lens module 1000 may be incident on the image sensor 280 . The reflective module 2000 may be removed, but is not limited thereto.

2 to 5, the reflective module 2000 includes a case 2200, a moving holder 2430 inside the case 2200, a reflective member 2410, a plurality of driving units 2330, 2340, and 2350, It may include a driving support part 2360 and a flow guide part 2600 .

The case 2200 may include an accommodation space therein. For example, the case 2200 may include a space to accommodate the reflective member 2410 and the moving holder 2430 . The case 2200 may have a shape in which at least one side surface or top surface and one side surface are open. The case 2200 may include a rigid material. For example, the case 2200 may include a material having predetermined reliability, such as resin, metal, or ceramic, and may support components disposed therein.

The moving holder 2430 may support the reflective member 2410 within the case 2200 . The moving holder 2430 may have an open area in the direction of the optical axis X and an open top, and may include an inclined bottom surface in the open area. The inclined bottom surface may be inclined at an angle in the range of 40 degrees to 50 degrees, for example, 45 degrees. The reflective member 2410 may be inserted into and attached to the inclined bottom surface and fixed.

The moving holder 2430 is movably accommodated in the inner space of the case 2200 and, for example, rotates in the second direction (Y axis) and the third direction (Z axis) within the case 2200. can possibly be accepted. Here, the second direction (Y axis) and the third direction (Z axis) may mean axes perpendicular to the first direction (X axis), and the second direction (Y axis) and the third direction (Z axis) ) may be mutually perpendicular axes. The first direction X is an optical axis direction, and the third direction Z may be a thickness direction or a vertical direction of the camera module 10 .

The reflective member 2410 may have a mirror or prism shape, and in the case of a prism shape, an incident surface exposed to the outside or facing an object, an exit surface exposed in an optical axis direction, and a bottom surface of the moving holder 2430. It includes a reflective surface, and may reflect incident light to the exit surface.

The plurality of driving units 2330 , 2340 , and 2350 may be respectively disposed on at least three side surfaces between the case 2200 and the moving holder 2430 . The plurality of driving units 2330 , 2340 , and 2350 may generate driving force so that the moving holder 2430 can rotate in at least two axes. The plurality of driving parts 2330 , 2340 , 2350 include a bottom area of the case 2200 and the moving holder 2430 , a first side area of the case 2200 and the moving holder 2430 , and the case ( 2200) and the second side area of the moving holder 2430, respectively. The first side area and the second side area may be opposite to each other.

The plurality of driving parts 2330, 2340, and 2350 include a plurality of coils C1, C2, and C3 and a plurality of magnets M1, M2, and M3, and the plurality of coils C1, C2, and C3 are case The plurality of magnets M1, M2, and M3 may be respectively disposed on the moving holder 2430 facing each of the plurality of coils C1, C2, and C3. Each of the plurality of driving units 2330, 2340, and 2350 includes a plurality of hall sensors H1, H2, and H3 disposed inside each coil C1, C2, and C3 and a rear surface of each magnet M1, M2, and M3. It may include a plurality of yokes (Y1, Y2, Y3) disposed on. The Hall sensors H1, H2, and H3 may be position sensors.

The plurality of coils C1 , C2 , and C3 are disposed on a connecting substrate and may be electrically connected to each other. The connecting board may include a circuit board having a wiring pattern that can be electrically connected, such as a rigid printed circuit board (Rigid PCB), a flexible printed circuit board (Flexible PCB), a rigid flexible printed circuit board (Rigid Flexible PCB). The plurality of yokes Y1 , Y2 , and Y3 may provide a magnetic flux shielding function for each magnet M1 , M2 , and M3 disposed in a corresponding region.

When power is selectively applied to the plurality of coils C1, C2, and C3 of the plurality of driving units 2330, 2340, and 2350, there is a gap between each magnet M1, M2, and M3 and the coils C1, C2, and C3. The moving holder 2430 equipped with the plurality of magnets M1 , M2 , and M3 may be rotated in the second direction Y and the third direction Z by electromagnetic influence. Here, the plurality of magnets M1 , M2 , and M3 are mounted on the moving holder 2430 , and the plurality of coils C1 , C2 , and C3 are mounted on the connection board of the case 2200 . The moving holder 2430 may be driven in a closed loop control method in which the position of the moving holder 2430 is sensed and fed back by the hall sensors H1, H2, and H3.

Here, a member supporting rotation of the moving holder 2430 between the case 2200 and the moving holder 2430 is located on the outside of the moving holder 2430, that is, on the opposite side of the emitting surface of the reflecting member 2410. can be placed. The member may include a rotation plate 2600 having a plurality of convex portions 2611 and 2612 arranged in different axial directions, support portions 2500 and 2550, and a driving support portion 2360. Here, among the support parts 2500 and 2550, the first support part 2500 is provided on the case 2200 or the moving holder 2430, and the second support part 2550 is provided on the moving holder 2430 or the case 2200. It can be.

The moving holder 2430 has a first convex portion 2611 aligned along the third direction (Z axis) to smoothly rotate in the second direction (Y axis) and the third direction (Z axis). The case 2200 is supported by second convex portions 1162 aligned along two directions (Y axis). Two of the convex portions 2611 and 2612 may be disposed spaced apart from each other along the respective axes (Y, Z) directions, and the driving units 2330, 2340, and 2350 operate in the second direction (Y axis) and the third direction. The rotational motion of the moving holder 2430 may be guided based on the direction (Z-axis). Each of the convex portions 2611 and 2612 may have a hemispherical shape or a circular column shape. The first and second convex parts 2611 and 2612 may be coupled to the first and second concave parts R1 and R2 disposed outside the moving holder 2430 and inside the second support part 2550 . The first concave portions R1 of the moving holder 2430 in which the first convex portion 2611 is disposed may have different shapes, one of which may be a hemispherical shape and the other a polygonal shape. The second concave portion R2 of the second support portion 2550 in which the second convex portion 2611 is disposed may have a different shape, one of which may be a hemispherical or bull shape, and the other may be a polygonal shape. The convex portions 2611 and 2612 may be separately coupled by ball bearings or may be integrally formed in a spherical, hemispherical, or rounded protrusion shape.

The outer side of the second support part 2550 and the inner side of the first support part 2500 may overlap with the rotation plate 2600 in the optical axis direction, and the driving support part 2360 having a magnet M4 and a yoke Y4 can be provided. The magnet M4 and the yoke Y4 of the driving support part 2360 may exert a pulling force (ie, attractive force) on each other. For example, the magnet M4 may be a pulling magnet provided in the moving holder 2430, and the yoke Y4 may be a pulling yoke provided in the case 2200. Conversely, the magnet may be provided in the case 2200 and the yoke may be provided in the moving holder 2430.

The reflection module 2000 according to an embodiment of the present invention includes a plurality of coils C1, C2, and C3 and a plurality of magnets M1, M2, and M3, and VCM (Voice Coil Motor) driving units 2330 and 2340, 2350) may be included. In addition, an embodiment of the present invention may implement an optical image stabilizer (OIS) by controlling the movement path of the incident light with the second axis (Y) and/or the third axis (Z). In this case, the reflective module 2000 may have improved optical characteristics by minimizing the occurrence of decentering and tilting phenomena when implementing OIS.

<Lens module 1000>

2 to 5 , the lens module 1000 may include an auto focus (AF) actuator. In addition, the lens module 1000 may include auto focus (AF) and zoom actuators. The lens module 1000 provides an auto focus (AF) function by moving any one lens barrel or at least one lens in the optical axis direction according to a control signal from a controller, or provides an auto focus (AF) and zoom function. can provide. The lens module 1000 may include two or more lens barrels. At least one of the two or more lens barrels is fixed, and at least the other one is movable. Each of the plurality of lens barrels 100 and 200 may include at least one lens 11 and 21 .

The plurality of lens barrels 100 and 200 may include a first lens barrel 100 and a second lens barrel 200 accommodated inside the first lens barrel 100 . One of the first lens barrel 100 and the second lens barrel 200 may be fixed, and the other may be movably coupled. For example, the first lens barrel 100 may be fixed, and the second lens barrel 200 may be movably coupled in the direction of the optical axis X.

The first lens barrel 100 may be disposed between the reflective module 2000 and the second lens barrel 200 . The second lens barrel 200 may be disposed between the first lens barrel 100 and the image sensor 551 of the sensor module 550 . As another example, when a sub-reflective member (not shown) is further disposed on the sensor side of the second lens barrel 200, the second lens barrel 200 is disposed between the first lens barrel 100 and the sub-reflective member. can be placed in As another example, when three or more lens barrels are disposed, one or two lens barrels may be fixed while the other may be moved.

2 to 6 , the first lens barrel 100 may include a first holder 110 having an accommodating part 190 and at least one lens 11 therein. The first holder 110 may include a first protrusion 102 protruding toward the reflective module 2000 and a plurality of side parts 111 , 121 , 131 , and 141 . The first protrusion 102 faces the emission surface of the reflective member 2410, and at least a portion thereof may be disposed inside the reflective module 200.

As shown in FIGS. 5 and 9 , the first protrusion 102 disposed on the front side of the first holder 110 may have flat portions F1 and F2 with flat tops and/or bottoms. The flat portions F1 and F2 may have a non-circular shape in which upper and/or lower portions of the inner lens 11 are cut. Here, the upper and lower portions of the first protrusion 102 may be flat portions in the Z-axis direction orthogonal to the optical axis. The flat portions F1 and F2 may reduce the height of the lens module 1000 or the thickness of the camera module 10 .

The first holder 110 includes a protruding area 104 extending toward the receiving part 190 on the same plane as the first flat part F1, and the protruding area 104 has a lens therein. can be placed. Stepped first seating portions 101 having a lower height may be included on both sides of the protruding region 104 . The first protrusion 102 and the protrusion area 104 of the first holder 110 may be integrally formed.

The first holder 110 includes a first side part 111 on one side of the accommodating part 190 with an open top, a second side part 121 on the other side, a bottom part 131 and a rear part 141. can do. The front portion of the first lens barrel 100 may be an object-side area of the accommodating portion 190 .

The first side part 111 and the second side part 121 may face each other at both sides of the accommodating part 190 where the second lens barrel 200 is disposed. The bottom part 131 is the bottom of the accommodating part 190 and faces the lower surface of the second lens barrel 200, and the rear part 141 has a penetration hole 145 therein, and the first and second lens barrels 141 It may be connected to sensor-side ends of the side parts 111 and 121 .

The rear part 141 may be a third side part supporting the object side between the first and second side parts 111 and 121 . The upper side of the rear part 141 may include second seating parts 103 stepped lower than the upper surface of the rear part 141 . The second seating parts 103 may be aligned with each of the first seating parts 101 in an optical axis direction, and may be provided at the same height as the first seating parts 101 .

The rear part 141 is a part adjacent to the sensor module 550 in the first holder 110 and has a transmission hole 145 therein, and an optical filter 559 is coupled to the transmission hole 145. can The optical filter 559 may include at least one of optical filters such as an infrared filter. The optical filter 559 may pass light of a set wavelength band and filter light of a different wavelength band. When the optical filter 559 includes an infrared filter, radiant heat emitted from external light may be blocked from being transferred to the image sensor. In addition, the optical filter 559 may transmit visible light and reflect infrared light.

The first holder 110 may be integrally formed with the first and second side parts 111 and 121 , the bottom part 131 and the rear part 141 . The first holder 110 may be formed of a resin material such as plastic, and during injection molding, the receiving part 190, the first and second side parts 111 and 121, the bottom part 131, and the rear part 141 are formed together. can do.

5 and 6, the first side part 111 of the first holder 110 extends from the front part toward the rear part 141, and may be provided as a closed structure or a frame without an open structure. . The second side part 121 extends from the front part toward the rear part 141, and may be provided as a frame without a closed structure or an open structure. The first and second side parts 111 and 121 may be parallel to each other. The depth of the bottom part 131 of the first holder 110 is a depth at which the second lens barrel 200 does not protrude.

A driving member 150 may be disposed in at least one area among areas between the first lens barrel 100 and the second lens barrel 200 . The area between the first lens barrel 100 and the second lens barrel 200 includes a boundary area within the first side portion 111, a boundary area within the second side portion 121, and a bottom portion ( 131) may be disposed in at least one area or at least two areas among boundary areas. The driving member 150 according to an embodiment of the present invention may be disposed in a bottom area between the first lens barrel 100 and the second lens barrel 200 . One or more driving members 150 may be disposed in a boundary area between the bottom of the first lens barrel 100 and the bottom of the second lens barrel 200 . The driving member 150 may be disposed on one side and the other side of a boundary area between the bottom of the first lens barrel 100 and the bottom of the second lens barrel 200 . For example, the driving member 150 includes a first driving unit 150A disposed on one side between the bottom of the first lens barrel 100 and the bottom of the second lens barrel 200 and a second driving unit disposed on the other side. (150B) may be included. The first and second driving units 150A and 150B may be disposed on both sides of the optical axis.

The first driving unit 150A may include a first coil 51, a first magnet 61 and a first yoke 53, which may overlap in the third direction (Z). The second driving unit 150B may include a second coil 52, a second magnet 61, and a second yoke 54, which may overlap in the third direction (Z).

5 and 6, the second lens barrel 200 is moved along the ball bearings B1, B2, B3, and B4 in the direction of the optical axis X by the first and second driving units 150A and 150B. It can be. The ball bearings B1, B2, B3, and B4 include guide grooves G1, G2, G3, and G4 disposed in regions that do not overlap with the first and second coils 51 and 52 in the third direction Z. can be moved along At least one ball bearing B1 , B2 , B3 , B4 may be disposed in each of the guide grooves G1 , G2 , G3 , and G4 . The ball bearings B1, B2, B3, and B4 are first to fourth ball bearings B1, B2, B3, and B4 disposed in the first to fourth guide grooves G1, G2, G3, and G4, respectively. can be distinguished. The guide grooves G1 , G2 , G3 , and G4 are formed as grooves or rails with a concave bottom of the bottom part 131 , and may be disposed in different areas.

The guide grooves G1 and G2 include the first and second guide grooves G1 and G2 disposed on both sides of the center of the bottom part 131 of the first holder 110 in the direction of the optical axis, and the first holder 110 It may include third and fourth guide grooves G3 and G4 disposed inside the first and second side parts 111 and 121 of ). The third and fourth guide grooves G3 and G4 are disposed closer to the sensor side or the rear part 141 than the first and second guide grooves G1 and G2, and are disposed further outside with respect to the optical axis X. It can be. The length L1 of the first and second guide grooves G1 and G2 is an optical axis movement distance, and may be greater than the length L2 of the third and fourth guide grooves G3 and G4, for example, twice or more. have.

At least a portion of the first and second guide grooves G1 and G2 may be disposed between the first and second coils 51 and 52 . The third and fourth guide grooves G3 and G4 may overlap the first and second coils 51 and 52 in an optical axis direction. The first to fourth guide grooves (G1, G2, G3, G4) may not overlap each other in the direction of the optical axis (X). The first and second guide grooves G1 and G2 may be symmetrical to each other with respect to the optical axis X, and the third and fourth guide grooves G3 and G4 may be symmetrical to each other with respect to the optical axis X.

The first and second guide grooves G1 and G2 may be parallel to the optical axis X at both sides of the bottom, and the third and fourth guide grooves G3 and G4 may be parallel to the optical axis X at both sides of the bottom rear surface. . 11, the second distance D2 between the third and fourth guide grooves G3 and G4 may be greater than the first distance D1 between the first and second guide grooves G1 and G2. . The second distance D2 between the third and fourth ball bearings B3 and B4 may be greater than the first distance D1 between the first and second ball bearings B1 and B2.

The first and second guide grooves G1 and G2 may have a cone shape, a triangular shape, or a hemispherical shape, and may be formed in the same shape or symmetrical to each other. The third and fourth guide grooves G3 and G4 may have a cone shape, a triangular shape, or a hemispherical shape, and may be formed in the same shape or symmetrical to each other.

The bottom part 131 of the first holder 110 has a first storage hole 133 on one side where the first coil 51 is disposed and a second storage hole on the other side where the second coil 52 is disposed. (134). One side and the other side of the bottom part 131 are areas opposite to each other with respect to the optical axis. The first and second accommodating holes 133 and 134 are holes penetrating the bottom part 131 and may be at least larger than the external sizes of the first and second coils 51 and 52 .

As shown in FIGS. 1, 5, and 9, when looking at the bottom portion 131 of the first holder 110, the first sub substrate 561 and the first yoke ( 53) is disposed, and a second sub substrate 562 and a second yoke 54 are disposed at the bottom of the second accommodating hole 134. The first sub substrate 561 and the second sub substrate 562 extend from the sub substrate 560 and may be electrically connected to the first and second coils 51 and 52 . When the first sub substrate 561 and the second sub substrate 562 are flexible substrates, a reinforcing material may be further disposed on the lower surface. The sub-board 560 may include a circuit board having a wiring pattern that can be electrically connected, such as a rigid printed circuit board (Rigid PCB), a flexible printed circuit board (Flexible PCB), and a rigid flexible printed circuit board (Rigid Flexible PCB). can

The first sub substrate 561 is disposed between the first coil 51 and the first yoke 53, and the second sub substrate 562 is disposed between the second coil 52 and the second yoke. (54). The first and second yokes 53 and 54 may be disposed in parallel and may be exposed at the bottom of the second lens barrel 200 . A hall sensor 56 may be disposed inside the first sub substrate 561 and the first coil 51 . The hall sensor 56 may be a detection sensor for alignment.

1 to 3 , the sensing module 550 includes a main board 552 and an extension board 554 extending from one end of the main board 552 in the direction of an optical axis (X). A connector board (not shown) may be coupled to one area of 554 . A sub board 560 may be connected to a lower part of the extension board 554 . The sub board 560 may include a driver that supplies or controls power to the driving member 150 .

The sensing module 550 includes an image sensor 551 disposed inside the main substrate 552, and the image sensor 551 includes the lenses 11 and 21 of the first and second lens barrels 100 and 200. ) and the optical axis direction. The image sensor 551 may include a Charge Coupled Device (CCD) or Complementary Metal Oxide Semiconductor (CMOS). The image sensor 551 may electrically convert incident light into a signal.

A reinforcing material for reinforcing rigidity may be disposed outside the main substrate 552 . The sensor module 550 may include a sensor base 558 disposed on an inner circumference of the main substrate 552 and a cover glass 556 inside the sensor base 558 . The sensor base 558 protects the periphery of the image sensor 551 and may face the rear part 141 of the first lens barrel 110 . The cover glass 556 is disposed between the optical filter 559 and the image sensor 551, protects an upper portion of the image sensor 551, and can prevent a decrease in reliability of the image sensor 551.

The main board 552 may include a circuit board having wiring patterns that can be electrically connected, such as a rigid printed circuit board (Rigid PCB), a flexible printed circuit board (Flexible PCB), and a rigid flexible printed circuit board (Rigid Flexible PCB). can

Referring to FIGS. 1 , 2 , 4 , and 7 to 12 , the second lens barrel 200 may include a second holder 210 having at least one lens 21 . The second lens barrel 200 may be accommodated in the accommodating part 190 of the first lens barrel 100 . The second lens barrel 200 is disposed on the bottom part 131 and disposed inside the first side part 111, the second side part 121, and the rear part 141 of the first holder 110. It can be.

The first holder 210 includes a first guide part 203 and a second guide part 205 spaced apart from each other at the bottom, and the first guide part 203 is the first guide groove G1. It is opposed to a part, and the second guide part 205 may be opposed to a part of the second guide groove G2. The first guide part 203 has a concave groove extending in the optical axis direction, and the concave groove may have a cone shape, a triangular shape, or a hemispherical shape. The second guide part 205 may be provided as a flat surface. The first and second guide parts 203 and 205 may be disposed on the outer lower portion of the circle formed by the lens 21 of the first holder 210 . The first guide part 203 and the second guide part 205 may have an asymmetrical shape.

The first ball bearing B1 is disposed between the groove of the first guide part 203 and the first guide groove G1, and may come into contact with the surrounding structures 203 and G1 at least four points. The second ball bearing B2 is disposed between the lower surface of the second guide part 205 and the second guide groove G2, and may come into contact with the surrounding structures 205 and G2 at least three points. The first and second ball bearings B1 and B2 may move in the optical axis direction along the second lens barrel 200 .

The second holder 210 may include a first side part 212 and a second side part 214 extending in the direction of the optical axis (X), and the first side part 212 is based on the inner lens 21. , and protrudes from the front portion of the first holder 110 toward the rear portion, and the second side portion 214 may protrude from the front portion of the first holder 110 toward the rear portion. The first side portion 212 and the second side portion 214 may extend to the same length, and may have symmetrical shapes with respect to the central axis of the second holder 210 .

The first side part 212 may include a third guide part 213 at the sensor-side end, and the second side part 214 may have a fourth guide part 215 at the sensor-side end. The lower surfaces of the third guide part 213 and the fourth guide part 215 may be lower and flatter than the lower surfaces of the first and second side parts 212 and 214 .

The third ball bearing B3 is disposed between the third guide part 213 and the third guide groove G3, and may come into contact with at least three points of the surrounding structures 213 and G3. The fourth ball bearing B4 is disposed between the fourth guide part 214 and the fourth guide groove G4, and may contact at least three points of the surrounding structures 214 and G4. The third and fourth ball bearings B3 and B4 may move in the optical axis direction along the second lens barrel 200 together with the first and second ball bearings B1 and B2 .

The third guide part 213 may be connected to the first stepped part ST1 which is stepped from the end of the first side part 212 toward the floor. The fourth guide part 215 may be connected to the first stepped part ST2 which is stepped from the end of the second side part 214 to the floor. A first stop protrusion P1 may protrude toward the sensor side of the third guide part 213 on the sensor side. A second stop protrusion P2 may protrude toward the sensor side of the fourth guide part 215 on the sensor side. The first and second stop protrusions P1 and P2 may function as stoppers when the second lens barrel 200 moves in the optical axis direction.

The first magnet 61 may be coupled to a lower portion of the first side portion 212 , and the second magnet 62 may be coupled to a lower portion of the second side portion 214 . The first side portion 212 has a plurality of first catching protrusions 261 , 262 , 263 protruding from the lower circumference and a first stepped portion ST1 , and the first magnet 61 has a plurality of first catching protrusions 261 , 262 , 263 . ) and the first stepped portion ST1, and may be bonded to the lower surface of the first side portion 212 with an adhesive. The second side portion 214 has a plurality of second catching protrusions 271 , 272 , 273 protruding from the lower circumference and a second stepped portion ST2 , and the second magnet 62 has a plurality of second catching protrusions 271 , 272 , 273 ) and the second stepped portion ST2, and may be bonded to the lower surface of the second side portion 214 with an adhesive.

When the second lens barrel 200 is stored in the accommodating part 190 of the first lens barrel 100, the first magnet 61 faces the first coil 51, and the second magnet (62) may be opposed to the second coil (52). As another example, the first and second coils 51 and 52 are coupled to the first lens barrel 100 as stators, but may be coupled to the second lens barrel 200 as movers, and the first and second magnets Reference numerals 61 and 62 are coupled to the second lens barrel 200 as movers, but may be coupled to the first lens barrel 100 as stators.

The first lens barrel 100 is formed by the electromagnetic force generated between the first coil 51 and the first magnet 61 and the electromagnetic force generated between the second coil 52 and the second magnet 62. The second lens barrel 200 may be moved in the direction of the optical axis (X) within the lens. In this case, the first stop protrusion P1 and the second stop protrusion P2 may limit and protect the moving distance of the second holder 210 when the second holder 210 moves in the optical axis direction.

The driving member 150 may move the second holder 210 in the direction of the optical axis X within the first holder 110 . The lens module 1000 automatically adjusts the distance between the image sensor 551 and the lenses 11 and 21 by controlling the driving member 150 to align the focal lengths of the lenses 11 and 21. autofocus, AF) function can be performed. In addition, the lens module 1000 controls the driving member 150 to increase or decrease the magnification of a distant subject through a zoom lens to zoom up or zoom out. ) can perform a zooming function.

The magnetization method of each of the first and second magnets 61 and 62 may be a method in which different poles are magnetized in the vertical direction or/and in the forward and backward directions. For example, N poles and S poles of each of the first and second magnets 61 and 62 may be arranged to face the first and second coils 51 and 52 . Accordingly, N poles and S poles of the first and second magnets 61 and 62 correspond to regions in which current flows in the third direction (z-axis direction) perpendicular to the ground in the first and second coils 51 and 52. Poles can be arranged individually. Here, magnetic force is applied in the opposite direction to the second direction (y-axis) from the N pole of the first and second driving units 150A and 150B (the direction of the magnetic force may be a positive direction or a negative direction of the illustrated direction ), when current flows in the third direction (z-axis) in the first and second coils 51 and 52 corresponding to the N pole, an electromagnetic force acts in the first direction (x-axis direction) according to Fleming's left-hand rule can In addition, magnetic force is applied in the second direction (y-axis direction) from the S pole of the first and second driving units 150A and 150B, and the first and second coils 51 and 52 corresponding to the S pole When a current flows in a vertical third direction (z-axis direction), electromagnetic force may act in a first direction (x-axis direction) according to Fleming's left-hand rule.

At this time, since the first and second coils 51 and 52 are in a fixed state in the first and second driving units 150A and 150B, the second holder in which the first and second magnets 61 and 62 are disposed ( 210) may move toward the object side or the sensor side (front/back) in the optical axis direction (x-axis, first direction) by the electromagnetic force according to the current direction. Accordingly, the lens module 2000 can prevent or minimize the occurrence of a decenter or tilt phenomenon of the lens during an auto focusing (AF) operation. Accordingly, the embodiment of the present invention can improve the align characteristics between the lenses, thereby preventing the angle of view from changing or out of focus, and thereby having improved image quality and resolving power.

Here, the attractive force between the first magnet 51 and the first yoke 53 and the attractive force between the second magnet 52 and the second yoke 54 is the second lens barrel 200 or the second lens barrel 200. The body 210 pulls the second lens barrel 200 toward the bottom. Accordingly, the first to fourth ball bearings B1 , B2 , B3 , and B4 may be moved in a state of being in contact with the surrounding structures by downward attraction. The first and second yokes 53 and 54 may be a pulling magnetic material.

Here, since the first and second yokes 53 and 54 are disposed at the bottom of the second lens barrel 200, the area of the first and second yokes 53 and 54 can be further increased, driving stability. can increase In addition, occurrence of left/right deviation in the optical axis direction can be suppressed by the first and second driving units 150A and 150B. In addition, since guide grooves G1 to G4 are formed in the bottom part 141 of the first holder 110, measurement of dimensions and management of tolerances may be convenient.

Accordingly, the ball bearings (B1, B2, B3, and B4) are disposed on the bottom of the lens module 1000 and move along the guide grooves (G1, G2, G3, and G4) in the form of rails, thereby preventing a problem of separation. can do. In addition, by coupling the first and second lens barrels 100 and 200 and the driving member 150 in the vertical direction, assemblability can be improved and tilt generation of the moving second lens barrel 200 can be suppressed. Accordingly, degradation of performance of the camera module 10 may be prevented.

The inner cover 400 will be described with reference to FIGS. 1, 2 and 12.

The inner cover 400 may cover an upper portion of the accommodating part 190 of the first lens barrel 100 . The inner cover 400 may include first seating protrusions 401 on both sides of the object side and second seating protrusions 403 on both sides of the sensor side. Each of the first seating protrusions 401 is seated on the first seating portion 101 of the first holder 110, and each of the second seating protrusions 403 is seated on the second seating portion 103. ) can be seated in each. Accordingly, the upper surface of the inner cover 400 and the upper surface of the first holder 110 may be provided as the same horizontal surface. As shown in FIG. 5 , both sides of the first holder 110 have concave empty spaces 135 to reduce the weight of the module.

The inner cover 400 may include a plurality of pressing protrusions 411 and 412 . The plurality of pressing protrusions 411 and 412 protrude toward the bottom of the first lens barrel 100 and press the upper surfaces of the first and second side parts 212 and 214 of the second lens barrel 200 . Accordingly, the inner cover 400 can prevent the second lens barrel 200 from moving upward or from being separated. The distance between the plurality of pressing protrusions 411 and 412 may be greater than the first distance D1 between the first and second guide grooves G1 and G2, or the third and fourth guide grooves G3 and G4. It may be equal to or greater than the second interval D2 between them. Outsides of the plurality of pressing protrusions 411 and 412 may face the first and second side surface portions 111 and 121 .

13 and 14 are diagrams for explaining a driving unit of a lens module according to comparative examples and embodiments. In the graphs (b) of FIGS. 13 and 14, the X-axis represents the movement time (s) of the second lens barrel 200, and the Y-axis represents the movement length (mm) per hour.

The comparative example of FIG. 13 is a case in which the second lens barrel is driven using only two guide grooves and two ball bearings, for example, first and second guide grooves and first and second ball bearings. This is the case of having first to fourth guide grooves and first to fourth ball bearings. As shown in FIG. 13 , when the second lens barrel is driven by using two ball bearings, the center of gravity is biased towards the object, so that the second lens barrel cannot be normally driven. As shown in FIG. 14 , when the second lens barrel is driven with four ball bearings and four guide grooves, the tilt value is significantly reduced compared to the comparative example, and the second lens barrel can be driven stably. In addition, during the reciprocating movement of the second lens barrel, a phase difference of 0.1 μm or less may be maintained, and normal optical performance may be provided within a critical range of a Z-axis tilt value (eg, about 0.03 μm).

15 is a perspective view of a mobile terminal to which a camera module disclosed in an embodiment of the present invention is applied.

Referring to FIG. 15 , a mobile terminal 3000 according to an embodiment may include a camera module 10 provided on a rear surface. The camera module 10 may include an image capturing function. In addition, the camera module 10 may include at least one of an auto focus function, a zoom function, and an OIS function.

The camera module 10 may process a still image or video frame obtained by an image sensor in a shooting mode or a video call mode. The processed image frame may be displayed on a display unit (not shown) of the mobile terminal 3000 and may be stored in a memory (not shown). In addition, although not shown in the drawing, the camera module may be further disposed on the front side of the mobile terminal 3000 .

The camera module 10 may include a first camera module 10A and a second camera module 10B. At this time, at least one of the first camera module 10A and the second camera module 10B may include a camera module including the lens module 1000 and the reflection module 2000 described above. Accordingly, the camera module may provide an OIS function together with an auto focus (AF) function. In particular, in the camera module 10, the first lens barrel 100 is disposed at a fixed position, and the second lens barrel 200 is movable in the optical axis direction within the first lens barrel 100. Provided, the total length (TTL) of the optical system may be constant. Accordingly, the camera module can be compactly provided when photographing a subject located at infinity or a short distance (about 30 mm) without increasing the overall length of the camera module, for example, the optical system.

In addition, the mobile terminal 3000 may further include an auto focus device 3010. The auto-focus device 3010 may include an auto-focus function using a laser. The auto-focus device 3010 may be mainly used in a condition in which an auto-focus function using an image of the camera module 10 is degraded, for example, a proximity of 10 m or less or a dark environment. The autofocus device 3010 may include a light emitting unit including a vertical cavity surface emitting laser (VCSEL) semiconductor device and a light receiving unit such as a photodiode that converts light energy into electrical energy.

In addition, the mobile terminal 3000 may further include a flash module 3030. The flash module 3030 may include a light emitting element emitting light therein. The flash module 3030 may be operated by a camera operation of a mobile terminal or a user's control.

16 is a perspective view of a vehicle to which a camera module disclosed in an embodiment of the present invention is applied. For example, FIG. 16 is an external view of a vehicle equipped with a vehicle driving assistance device to which the camera module 10 disclosed in the embodiment of the present invention is applied.

Referring to FIG. 16 , a vehicle 4000 according to an embodiment may include wheels 4210 and 4230 rotating by a power source and a camera module 4100 . The camera module 4100 may be disposed toward at least one of the front, rear, side, top, and bottom directions of the vehicle to process a still image or video frame. In this case, the camera module 4100 may include the lens module 1000 and the reflection module 2000 described above. Accordingly, the camera module may provide an OIS function together with an AF or zoom function.

The camera module 4100 may be disposed in the vehicle 4000 to provide various information. For example, the camera module 4100 may capture a front image or surrounding image of the vehicle 4000 and obtain image information through a camera sensor. The camera module 4100 may use the obtained image information to determine a lane unidentified situation and provide information on a virtual lane when the lane is not identified.

In addition, the camera module 4100 may acquire a front image of the vehicle 4000, and a processor (not shown) may provide image information by analyzing an object included in the front image.

In addition, when the image captured by the camera module 4100 includes objects such as median strips, curbs, and roadside trees corresponding to lanes, adjacent vehicles, driving obstacles, and indirect road markings, the processor detects these objects and provides image information can provide. At this time, the processor may acquire distance information to the object detected through the camera module 4100 to further supplement image information. The image information may be information about an object photographed in an image.

Features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, and effects illustrated in each embodiment can be combined or modified with respect to other embodiments by those skilled in the art in the field to which the embodiments belong. Therefore, contents related to these combinations and variations should be construed as being included in the scope of the present invention.

In addition, although the above has been described with a focus on the embodiments, these are only examples and do not limit the present invention, and those skilled in the art to which the present invention belongs can exemplify the above to the extent that does not deviate from the essential characteristics of the present embodiment. It will be seen that various variations and applications that have not been made are possible. For example, each component specifically shown in the embodiment can be modified and implemented. And 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.

10: camera module 51,52: first coil
61,62: first magnet 53,54: first yoke
1000: lens module 2000: reflection module
100: first lens barrel 200: second lens barrel
150: driving member 150A: first driving unit
150B: second driving unit 551: image sensor

Claims (16)

a first lens barrel having an open upper portion and at least one lens;
a second lens barrel disposed in the accommodating part of the first lens barrel and having at least one lens;
a plurality of ball bearings disposed between a bottom of the first lens barrel and a bottom of the second lens barrel; and
first and second driving units disposed on both sides between a bottom of the first lens barrel and a bottom of the second lens barrel;
wherein the first and second driving units move the second lens barrel in an optical axis direction along the ball bearings. According to claim 1,
The first lens barrel includes a first holder having the at least one lens; a first side surface disposed on one side of the storage unit and a second side surface disposed on the other side of the storage unit; a rear portion covering sensor-side ends of the first and second side portions and having a penetration hole therein; And a bottom portion that is the bottom of the storage portion,
The second lens barrel is disposed on the bottom of the first lens barrel, and is disposed inside the first and second side parts and the rear part. According to claim 2,
The second lens barrel includes a second holder having the at least one lens; and a first side portion extending from one side of the second holder toward the sensor side. And a second side portion extending from the other side of the second holder toward the sensor side,
The camera module of claim 1 , wherein the first side portion and the second side portion have the same length in an optical axis direction. According to claim 3,
The plurality of ball bearings include first and second ball bearings disposed on both sides of the lower portion of the first holder, and third and fourth ball bearings disposed at sensor-side ends of the first and second side parts, respectively. . According to claim 3,
first and second guide grooves disposed on both sides of the center of the accommodating part at the bottom of the first lens barrel; And third and fourth guide grooves disposed inside the first and second side parts adjacent to the rear part,
The first to fourth ball bearings are disposed in the first to fourth guide grooves, respectively. According to claim 5,
At the bottom of the first holder of the second lens barrel, a first guide part having a concave groove facing a part of the first guide groove, and a second guide part having a flat surface facing a part of the second guide groove including wealth,
The first side portion of the second lens barrel has a third guide portion at an end portion on the sensor side opposite to the third guide groove and having a flat lower surface, and the second side portion faces the fourth guide groove at the end portion on the sensor side. A camera module including a fourth guide unit having a flat lower surface. According to claim 6,
The third guide part is stepped at a height lower than the upper surface of the first side part,
The fourth guide part is stepped lower than the upper surface of the second side part,
A camera module wherein stop protrusions are disposed on the sensor-side surfaces of the third and fourth guide units, respectively. According to any one of claims 1 to 7,
The first driving unit may include a first coil disposed on one side of the bottom of the first lens barrel; a first magnet disposed on one side of the bottom of the second lens barrel; And a first yoke disposed under the first coil,
The second driving unit includes a second coil disposed on the other side of the bottom of the first lens barrel; a second magnet disposed on the other side of the bottom of the second lens barrel; and a second yoke disposed under the second coil. a first lens barrel having a first holder having at least one lens and a receiving part having an open top;
a second lens barrel disposed in the accommodating part of the first lens barrel and having a second holder holding at least one lens;
a plurality of ball bearings disposed between the first lens barrel and the second lens barrel;
a driving member moving the second lens barrel in an optical axis direction along the plurality of ball bearings; and
and an inner cover covering the receiving portion of the first lens barrel and having a plurality of pressing protrusions therein protruding toward the second lens barrel. According to claim 9,
The driving member includes a first driving unit and a second driving unit disposed on one side and the other side of the housing unit, the camera module. According to claim 9,
The first lens barrel includes first and second side parts disposed on both sides of the second lens barrel, a rear part disposed on a sensor side, and a bottom part disposed on a bottom of the second lens barrel;
The first holder, the first and second side parts, the rear part, and the bottom part are integrally formed, the camera module. According to any one of claims 9 to 11,
first and second guide grooves arranged parallel to the optical axis at a first interval at the bottom of the housing unit; and third and fourth guide grooves having a second distance greater than the first distance and disposed parallel to the optical axis;
Lengths of the third and fourth guide grooves are smaller than lengths of the first and second guide grooves in the optical axis direction;
The camera module wherein the ball bearings are respectively disposed in the first to fourth guide grooves. According to claim 12,
The number of contact points of the ball bearing disposed in the first guide groove is greater than the number of contact points of the ball bearing disposed in the second guide groove,
The number of contact points of the ball bearings disposed in the third and fourth guide grooves is the same as each other. According to claim 9,
The top surface of the inner cover is the same plane as the top surface of the first lens barrel, the camera module. According to claim 1 or 9,
The first lens barrel includes a first protrusion protruding toward the object and at least one of a top and bottom of which is flat;
The camera module of claim 1 , wherein the at least one lens disposed within the first protrusion is non-circular. a lens module having a plurality of lens barrels; and
including a reflective module;
The lens module performs an auto focusing or zoom function by moving any one of the plurality of lens barrels,
The reflection module performs an Optical Image Stabilizer (OIS) function,
The lens module is a camera module having the first and second lens barrels according to claim 1 or 9.

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