KR20200012011A - Lens driving equipment and information and technology equipment including the same - Google Patents

Abstract

A camera module is disclosed. According to the present invention, the camera module comprises: a housing; a lens barrel disposed in the housing and receiving a lens assembly including one or more lenses; an elastic member fixed to the housing and the lens barrel; a driving unit for moving the lens barrel relative to the housing; and a sensor unit fixed to the housing.

Description

LENS DRIVING EQUIPMENT AND INFORMATION AND TECHNOLOGY EQUIPMENT INCLUDING THE SAME}

Embodiments relate to a lens driving device, a camera module and an information technology device.

Currently, camera modules are installed in the manufacturing of automobiles and endoscopes, including mobile communication terminals, IT devices (Information Technology Equipment) such as PDAs and MP3 players, and these camera modules are manufactured at 300,000 pixels (VGA level). As development progresses, the development of high-pixel centers and miniaturization and thinning are progressed depending on the mounting target, and various additional functions such as auto focusing (AF) and optical zoom (OPTICAL ZOOM) can be implemented at low cost. .

In addition, the current camera module is equipped with an image sensor module manufactured in a wire bonding method (COB; Chip Of Board), flip chip method (COF; Chip Of Flexible) and chip scale package (CSP) It is mainly manufactured in the form of being connected to the main board through electrical connection means such as a printed circuit board (PCB) or flexible printed circuit board (FPCB).

However, recently, a camera module that can simplify the manufacturing process and reduce the manufacturing cost has been demanded from the user by allowing it to be directly mounted on the main substrate as with a general passive element.

Such a camera module is mainly manufactured in a state in which an image sensor such as a CCD or a CMOS is attached to a substrate by a wire bonding or flip chip method, and condenses an image of an object through the image sensor to memory in and out of the camera module. The data is stored on the image, and the stored data is converted into an electrical signal and displayed as an image on a display medium such as an LCD or a PC monitor in the device.

The conventional camera module includes a housing in which an image sensor for converting an image signal input through a lens into an electrical signal is supported on a bottom surface, a lens group for collecting an image signal of a subject in the image sensor, and the lens group stacked therein. It is constructed by the sequential joining of the barrels.

At this time, the lower part of the housing is electrically coupled to the mounting substrate (FPCB) to which the capacitor and the chip component of the resistor, which is an electrical component for driving the image sensor consisting of CCD or CMOS.

In the conventional camera module configured as described above, an anisotropic conductive film (ACF) is inserted between the substrate and the image sensor in a state where a plurality of circuit components are mounted on the mounting substrate (FPCB), and applied with heat and pressure to conduct electricity. Adhesively fix and attach the infrared cut filter unit on the opposite side.

In addition, as described above in the state in which the barrel and the housing in which the plurality of lens groups are built are temporarily coupled by screwing, the pre-assembled mounting substrate is adhesively fixed to the bottom of the housing by a separate adhesive.

On the other hand, after the adhesive fixing of the mounting board and the housing to which the image sensor is attached and the barrel is coupled, the focus adjustment is performed by setting a subject (resolution chart) at a predetermined distance in front of the barrel. As the vertical feed amount by the rotation of the barrel screwed to the housing is adjusted, the focus is adjusted between the lens group and the image sensor.

Embodiments provide a camera module that effectively prevents camera shake.

Camera module according to one embodiment comprises a housing; A lens barrel disposed within the housing and containing a lens assembly including one or more lenses; An elastic member fixed to the housing and the lens barrel; A drive unit for moving the lens barrel relative to the housing; And a sensor unit fixed to the housing.

The camera module according to the embodiment may compensate for shaking by driving the lens barrel with respect to the housing. That is, the driving unit may compensate for shaking by relatively moving the lens barrel with respect to the housing.

In particular, the camera module according to the embodiment may allow the image formed on the sensor unit to have a negative distortion by the lens assembly. Accordingly, when the shake is corrected by the movement of the lens barrel, it is possible to minimize the error of the outer portion of the image.

1 is a view showing a camera module according to an embodiment.
2 is a view illustrating an optical system including a lens assembly, an infrared cut filter unit, and a sensor unit.
3 is a view illustrating that an image incident on a sensor unit is formed through a lens assembly.
4 is a diagram illustrating distortion of an optical system including a lens assembly, an infrared cut filter unit, and a sensor unit.
FIG. 5 is a diagram illustrating image movement due to camera shake and correction thereof. FIG.
6 is a diagram illustrating a camera module according to another exemplary embodiment.
7 is a diagram illustrating a camera module according to another embodiment.

In the description of the embodiments, each lens, unit, part, hole, protrusion, groove or layer, etc., is on or under the "on" of each lens, unit, part, hole, protrusion, groove or layer, etc. And " under " include both " directly " or " indirectly " through other components. . In addition, the criteria for the top or bottom of each component will be described with reference to the drawings. The size of each component in the drawings may be exaggerated for description, and does not mean a size that is actually applied.

1 is a view showing a camera module according to an embodiment. 2 is a view illustrating an optical system including a lens assembly, an infrared cut filter unit, and a sensor unit. 3 is a view illustrating that an image incident on a sensor unit is formed through a lens assembly. 4 is a diagram illustrating distortion of an optical system including a lens assembly, an infrared cut filter unit, and a sensor unit. FIG. 5 is a diagram illustrating image movement due to camera shake and correction thereof. FIG.

1 to 5, the camera module according to the embodiment includes the lens barrel 100, the lens assembly 200, the first elastic member 310, the second elastic member 320, and the first housing 410. , A second housing 420, an infrared cut filter unit 500, a sensor unit 600, a circuit board 800, and a driving unit 710, 720, 730, and 740.

The lens barrel 100 receives the lens assembly 200. The lens barrel 100 may include a receiving groove for accommodating the lens assembly 200. The receiving groove may have a shape corresponding to the lens assembly 200.

The lens barrel 100 may have a rectangular or cylindrical shape. That is, the outside of the lens barrel 100 may have a rectangular shape or a circular shape.

The lens barrel 100 is connected to the first housing 410. In more detail, the lens barrel 100 is connected to the first housing 410 through the first elastic member 310. That is, the lens barrel 100 may be connected to the first housing 410 so as to be movable by the first elastic member 310.

In addition, the lens barrel 100 may include a light receiving groove opened upwards (object side). The light incident groove exposes the lens assembly 200. An image is incident on the lens assembly 200 through the light incident groove.

The lens assembly 200 is disposed in the lens barrel 100. In more detail, the lens assembly 200 is disposed in the receiving groove. The lens assembly 200 is inserted into the receiving groove. The lens assembly 200 may have a circular outer shape. In more detail, the lens assembly 200 may have a circular shape when viewed from the top side. Alternatively, the lens assembly 200 may have a rectangular shape when viewed from the top side.

The lens assembly 200 includes a plurality of lenses 210, 220, 230, and 240. For example, the lens assembly 200 may include a first lens 210, a second lens 220, a third lens 230, and a fourth lens 240. The third lens 230, the second lens 220, and the first lens 210 may be sequentially stacked.

In addition, a first spacer and a second spacer may be interposed between the lenses 210, 220, 230, and 240. The first spacer and the second spacer may be spaced apart from each other between the lenses 210, 220, 230, and 240.

In the above, the lens assembly 200 has been described as including four lenses, but is not limited thereto. That is, the lens assembly 200 may include one to three lenses or may include five or more lenses.

Referring to FIG. 2, the lens assembly 200, the infrared cut filter 500, and the sensor 600 constitute an optical system.

The first lens 210, the second lens 220, the third lens 230, and the fourth lens 240 are sequentially disposed from an object side to an image side. In order to obtain a subject image, light corresponding to the image information of the subject may include the first lens 210, the second lens 220, the third lens 230, the fourth lens 240, and the infrared cut-off filter unit ( Pass through 500 is incident to the sensor unit 600.

The first lens 210 has a positive refractive power, the second lens 220 has a negative refractive power, and the third lens 230 has a positive power. The fourth lens 240 may have a negative refractive power. In addition, the first lens 210, the second lens 220, the third lens 230, and the fourth lens 240 may be formed of glass or plastic.

The object side surface R1 of the first lens 210 may be convex, and the image side surface R2 of the first lens 210 may be convex, concave, or planar. In addition, the object side surface R1 of the first lens 210 may be aspherical or spherical. Preferably, the first lens 210 is biconvex in the vicinity of the optical axis.

The curvature of the image side surface R2 of the first lens 210 may satisfy Equation 1 below.

Equation 1

0≤R <0.01

In more detail, the curvature of the image side surface R2 of the first lens 210 may satisfy Equation 2 below.

Equation 7

0≤R <0.001

In more detail, the curvature of the image side surface R2 of the first lens 210 may be zero.

That is, the image side surface R2 of the first lens 210 has a very small curvature. The image side surface R2 of the first lens 210 may include a plane. The image side surface R2 of the first lens 210 may be a flat surface or a nearly curved surface. Since the image side surface R2 of the first lens 210 is close to a plane, the tolerance of the compact optical system according to the embodiment may be reduced.

The second lens 220 may have a meniscus shape. The object side surface R3 of the second lens 220 may be concave, and the image side surface R4 of the second lens 220 may be concave. That is, the second lens 220 may have a concave shape. In addition, the object side surface R3 and the image side surface R4 of the second lens 220 may be spherical or aspheric. The second lens 220 preferably has a meniscus shape in which a concave surface faces toward the object side.

The third lens 230 is a convex surface in the vicinity of the optical axis, and has a positive power. The object-side surface of the third lens 230 may be, for example, a concave surface in the vicinity of the optical axis.

The object side surface R5 of the third lens 230 may be concave, and the image side surface R6 of the third lens 230 may be convex. In addition, the object side surface R5 and the image side surface R6 of the third lens 230 may be spherical or aspheric.

The focal length of the third lens 230 may satisfy Equation 2 below.

Equation 2

0.5 <f3 / F <1.0

Here, f3 is the effective focal length of the third lens 230, F is the total focal length of the compact optical system according to the embodiment.

In more detail, the focal length of the third lens 230 may satisfy Equation 4 below.

Equation 4

0.6 <f3 / F <0.9

The fourth lens 240 may have a meniscus shape. The object side surface R7 of the fourth lens 240 may be convex, and the image side surface R8 of the fourth lens 240 may be concave. In addition, the object side surface R7 and the image side surface R8 of the fourth lens 240 may be aspherical.

In addition, the fourth lens 240 is formed to include at least one aspherical inflection point.

In this case, at least one aspherical inflection point may be formed on the object side surface R7 of the fourth lens 240. In addition, one or more aspherical inflection points CP may be formed on the image side surface R8 of the fourth lens 240. The aspherical inflection point formed on the fourth lens 240 may adjust the maximum exit angle of the chief ray incident on the light receiving element 70.

The focal length of the fourth lens 240 may satisfy Equation 3 below.

Equation 3

-10 <f4 / F <-0.5

Here, f4 is the effective focal length of the fourth lens 240, F is the total focal length of the compact optical system according to the embodiment.

In more detail, the focal length of the fourth lens 240 may satisfy Equation 5 below.

Equation 5

-1 <f4 / F <-0.5

When the light receiving element 70 of the upper surface R11 is a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) sensor, there is an angle at which light amount is secured at each pixel. Therefore, the periphery of the screen becomes dark.

Therefore, by forming an aspherical inflection point on the image side surface R8 of the fourth lens 240 to adjust the maximum exit angle of the chief ray, it is possible to prevent the peripheral portion of the screen from darkening.

The optical system may satisfy Equation 6 below.

Equation 6

1 <ttl / F <1.3

Here, ttl is the distance from the object side surface to the image side surface of the first lens 210, F is the total effective focal length.

When the optical system is designed as above, the optical system may have a negative distortion. That is, as shown in FIGS. 3 and 4, the optical system may have a negative distortion.

For example, in the optical system, when the field height is 0F to 1.0F, the distortion of the image of the sensor unit 600 may be 0% to -2%.

In more detail, in the optical system, when the field height is 0.7F to 1.0F, the distortion of the image of the sensor unit 600 may be 0% to -2%.

Unlike this, in the optical system, when the field height is 0F to 1.0F, the distortion of the image of the sensor unit 600 may be -2% to -5%.

In more detail, in the optical system, when the field height is 0.7F to 1.0F, the distortion of the image of the sensor unit 600 may be -2% to -5%.

The first elastic member 310 is disposed in the first housing 410. The first elastic member 310 is fixed to the first housing 410. In addition, the first elastic member 310 is fixed to the barrel 100 of the first lens 210. The first elastic member 310 fixes the lens barrel 100 to the first housing 410 to be movable.

The first elastic member 310 may include a spring or the like. In more detail, the first elastic member 310 may include a plate-shaped spring.

The first housing 410 accommodates the lens barrel 100. The first housing 410 is connected to the lens barrel 100 through the first elastic member 310.

The first housing 410 may be formed of plastic or metal. The first housing 410 may have a rectangular cylindrical shape.

The second housing 420 accommodates the first housing 410. That is, the first housing 410 is disposed in the second housing 420. The first housing 410 and the second housing 420 are connected to each other by the second elastic member 320.

The first housing 410 is fixed to the second housing 420 to be movable by the second elastic member 320. That is, the first housing 410 may be disposed in a floating state and disposed in the second housing 420.

The second housing 420 is fixed to the circuit board 800. The second housing 420 may be fastened to the circuit board 800. The second housing 420 may be formed of metal or plastic.

The second elastic member 320 is connected to the first housing 410 and the second housing 420. The second elastic member 320 fixes the first housing 410 to be movable to the second housing 420. The second elastic member 320 may include a spring or the like. In more detail, the second elastic member 320 may include a plate-shaped spring.

The infrared cut filter 500 is disposed in the second housing 420. The infrared cut filter 500 may be fixed to the circuit board 800 and may be fixed to the second housing 420. The infrared cut filter 500 filters the incident infrared light. The infrared cut filter 500 may block light of excessive long wavelengths flowing into the sensor 600.

The infrared cut filter 500 may be formed by alternately depositing titanium oxide and silicon oxide on the optical glass. In order to block infrared rays, the thickness of the titanium oxide and the silicon oxide may be appropriately adjusted.

The sensor unit 600 is accommodated in the second housing 420. The sensor unit 600 includes a CCD image sensor or a CMOS image sensor. In addition, the sensor unit 600 further includes a circuit board 800 connected to the image sensor. The sensor unit 600 converts an incident image into an electrical signal.

The sensor unit 600 is fixed to the circuit board 800. The sensor unit 600 may be mounted on the circuit board 800. The sensor unit 600 is electrically connected to the circuit board 800.

The size of the imaging area of the sensor unit 600 may be 2.5 mm × 4.0 mm. In addition, the horizontal and vertical sizes of the unit pixels of the sensor unit 600 may be 2 μm or less.

The circuit board 800 may cover the bottom of the second housing 420. The circuit board 800 is coupled to the second housing 420. The circuit board 800 may be a printed circuit board 800 (PCB). The circuit board 800 may be electrically connected to the sensor unit 600. The circuit board 800 may apply a signal for driving the sensor unit 600. In addition, the circuit board 800 may receive a signal from the sensor unit 600.

The sensor unit 600 is mounted on the circuit board 800. In more detail, the sensor unit 600 may be fixed to the circuit board 800. That is, the sensor unit 600 may be fixed to the second housing 420 through the circuit board 800.

In addition, the circuit board 800 may be electrically connected to the driving units 710, 720, 730, and 740. That is, a signal for driving the drivers 710, 720, 730, and 740 may be applied to the drivers 710, 720, 730, and 740 through the circuit board 800.

The driving units 710, 720, 730, and 740 drive the lens barrel 100 with respect to the first housing 410. In addition, the driving units 710, 720, 730, and 740 drive the first housing 410 with respect to the second housing 420.

The driving units 710, 720, 730, and 740 may move the lens barrel 100 and the first housing 410 by a magnetic force. The driving units 710, 720, 730, and 740 may include a first driving unit 710, a second driving unit 720, a third driving unit 730, and a fourth driving unit 740. The driving units 710 and 720 may move the lens barrel 100 relative to the housing 400 by a magnetic force. In this case, the magnetic force may act in a direction inclined with respect to the optical axis OA of the lens assembly 200.

The first driver 710 is attached to the lens barrel 100. The first driver 710 may be fixed to the lens barrel 100. The first driver 710 may be disposed outside the lens barrel 100.

The first driver 710 may include a coil. The first driver 710 may receive a driving signal through the circuit board 800. The first driver 710 may generate a magnetic field by an electrical signal.

The first driver 710 may apply an attractive force or repulsive force to the second driver 720 in a direction inclined with respect to the reference horizontal plane. In this case, the first driver 710 may apply a magnetic force to the second driver 720 at an angle of about + 20 ° to about + 70 ° with respect to the reference horizontal plane. In more detail, the first driver 710 may apply a magnetic force to the second driver 720 at an angle of about + 30 ° to about + 50 ° with respect to the reference horizontal plane R.

The second driver 720 is attached to the first housing 410. In more detail, the second driver 720 may be fixed to the first housing 410. In more detail, the second driver 720 may be fixed inside the first housing 410.

The second driver 720 includes a magnetic material. The second driver 720 may have a plate shape. That is, the second driver 720 may be a plate magnet.

The first driver 710 and the second driver 720 are adjacent to each other. The first driver 710 and the second driver 720 may be spaced at very small intervals. An interval between the first driver 710 and the second driver 720 may be about 50 μm to about 1000 μm. The first driver 710 and the second driver 720 may face each other. Accordingly, a magnetic force may be generated between the first driver 710 and the second driver 720.

The first driver 710 and the second driver 720 relatively move the lens barrel 100 with respect to the first housing 410. In more detail, the first driving unit 710 and the second driving unit 720 may move the lens barrel 100 relative to the first housing 410 in the optical axis direction of the lens assembly 200. Can be.

The third driver 730 is attached to the first housing 410. In more detail, the third driver 730 may be fixed to the first housing 410. In more detail, the third driver 730 may be fixed to the outside of the first housing 410.

The third driver 730 includes a magnetic body. The third driver 730 may have a plate shape. That is, the third driver 730 may be a plate magnet.

The fourth driver 740 is attached to the second housing 420. In more detail, the fourth driver 740 is fixed to the second housing 420. The fourth driver 740 may be disposed inside the second housing 420.

The fourth driver 740 may include a coil. The fourth driver 740 may receive a driving signal through the circuit board 800. The fourth driver 740 may generate a magnetic field by an electrical signal.

The third driver 730 and the fourth driver 740 are adjacent to each other. The third driver 730 and the fourth driver 740 may be spaced apart at very small intervals. An interval between the third driver 730 and the fourth driver 740 may be about 50 μm to about 1000 μm. The third driver 730 and the fourth driver 740 may face each other. Accordingly, a magnetic force may be generated between the third driver 730 and the fourth driver 740.

The third driver 730 and the fourth driver 740 relatively move the first housing 410 with respect to the second housing 420. In more detail, the third driving unit 730 and the fourth driving unit 740 are horizontal to the optical axis of the lens assembly 200 with respect to the second housing 420, and the first housing 410. You can move the opponent.

As a result, the driving units 710, 720, 730, and 740 may relatively move the lens assembly 200 in the horizontal direction with respect to the optical axis and the optical axis with respect to the sensor unit 600.

For example, when the subject is moved in the horizontal direction due to shaking, the first housing 410 may be tilted or horizontally moved by the third driver 730 and the fourth driver 740. . Accordingly, the horizontal relative position between the lens assembly 200 and the sensor unit 600 may be adjusted to each other.

In addition, the focal length between the lens assembly 200 and the sensor unit 600 may be adjusted by the first driver 710 and the second driver 720.

In particular, since the optical system has a negative distortion, the image movement due to the shaking in the horizontal direction is minimized, and the error of the correction can be reduced accordingly.

That is, as shown in Figure 5, the camera module according to this embodiment is shaken, when the image is moved in the sensor unit 600, the driving unit 710, 720, 730, 740 is the lens barrel Move 100 in the opposite direction to the direction of movement of the image. For example, the driving units 710, 720, 730, and 740 reposition the lens barrel 100 by moving the image through the horizontal movement or tilting.

In this case, since the optical system has a negative distortion, an error in the image due to the movement of the lens barrel 100 may be minimized in the outer portion of the image.

That is, since the optical system of the camera module according to the present embodiment has a negative distortion, as the distance from the optical axis, the optical system is moved, it is possible to prevent the distance to move the image increases.

In particular, the camera module according to the present embodiment can minimize the image shake of the outer portion of the imaging area and maximize the shake correction effect.

6 is a diagram illustrating a camera module according to another exemplary embodiment. In this embodiment, reference is made to the camera module described above. That is, the description of the camera module in the foregoing embodiment may be essentially combined with the description of the present embodiment except for the changed part.

Referring to FIG. 6, in the camera module according to the present embodiment, the first housing 410 may be omitted. In addition, the lens barrel 100 may be directly connected to the second housing 420 through the elastic member. In this case, the elastic member may connect the lens barrel 100 and the second housing 420 in a direction inclined with respect to the optical axis of the lens assembly 200.

In addition, a first driving unit 710 is attached to the lens barrel 100. The first driver 710 may include a magnetic material.

In addition, a fourth driver 740 is attached to the inside of the second housing 420. The fourth driver 740 may include a coil.

In addition, a fifth driver 750 is attached to the circuit board 800. In more detail, the fifth driver 750 may be interposed between the first driver 710 and the circuit board 800. The fifth driver 750 may include a coil.

In addition, the fourth driver 740 and the fifth driver 750 may be electrically connected to the circuit board 800.

The lens barrel 100 may be driven in a horizontal direction perpendicular to the optical axis by a magnetic force between the first driver 710 and the fourth driver 740. In addition, the lens barrel 100 may be driven in the optical axis direction by a magnetic force between the first driver 710 and the fifth driver 750.

That is, the lens barrel 100 may be driven in the horizontal direction by the first driver 710 and the fourth driver 740. In addition, the lens barrel 100 may be driven in the optical axis direction by the first driver 710 and the fifth driver 750.

The camera module according to the present embodiment has a simple structure and may perform shake correction and auto focus adjustment.

7 is a diagram illustrating a camera module according to another embodiment. In this embodiment, reference is made to the camera modules described above. That is, the description of the camera modules in the foregoing embodiment may be essentially combined with the description of the present embodiment except for the changed part.

Referring to FIG. 7, in the camera module according to the present exemplary embodiment, the third driver 730 may be omitted, and the fourth driver 740 may be adjacent to the second driver 720. In more detail, the fourth driver 740 may be interposed between the second driver 720 and the circuit board 800.

In an embodiment, the second driver 720 may be a magnet. For example, the magnet may have a plate shape. Accordingly, the magnet may include a lower surface, an upper surface, and side surfaces.

The first driver 710 may include a first coil. In addition, the first coil that is the first driver 710 and the magnet that is the second driver 720 may face each other. Accordingly, the side surfaces of the magnet that is the second driver 720 may include a first side that faces the first coil that is the first driver 719 and a second side that is disposed opposite to the first side, The upper surface of the magnet may overlap the upper wall of the first housing 410 in a vertical direction.

In an embodiment, the fourth driver 740 may include a second coil. In addition, in the embodiment, the first coil, which is the first driver 710, and the second coil, which is the fourth driver 740, may share the magnet, which is the second driver 720, with each other.

Accordingly, in the embodiment, the first coil may face the first side of the magnet in the horizontal direction. The second coil may face the lower surface of the magnet in the vertical direction so that the first coil and the second coil share the magnet.

In an embodiment, the first side surface of the magnet may meet both the bottom surface of the magnet and the top surface of the magnet.

In an embodiment, the second housing 420 may be fixed to the circuit board 800. In addition, the second coil, which is the fourth driver 740, may be interposed between the magnet, which is the second driver 720, and the circuit board 800.

Accordingly, the second coil may be disposed between the magnet and the second housing 420 in the vertical direction, and the second coil may be disposed lower than the bottom surface of the barrel 100.

In an exemplary embodiment, the first driver 710 and the second driver 720 may face each other, and a magnetic force may be generated between the first coil 710 and the magnet that is the second driver 720. Can be generated.

At this time, in the vertical direction, the vertical width of the first side of the magnet may be larger than the vertical width of the region of the first coil disposed in the barrel 100 facing the first side of the magnet. .

In addition, as shown in FIG. 7, the first housing 410 may be driven by a magnetic force between a magnet that is the second driver 720 and a second coil that is the fourth driver 740.

At this time, in the horizontal direction, the horizontal width between the first side of the magnet and the second side of the magnet is the width of the second coil disposed in the second housing 420 facing the lower surface of the magnet. It may be smaller than the horizontal width of the area.

As described above, the horizontal width between the first side and the second side of the magnet that is the second driver 720 is the horizontal width of the area of the second coil that is the fourth driver 740 that faces the bottom of the magnet. It can be smaller than. Accordingly, the horizontal width of the region of the second coil, which is the fourth driver 740, may be larger than the horizontal width between the first side and the second side of the magnet, which is the second driver 720.

For example, the upper surface of the second coil, which is the fourth driver 740, may include a first part, a second part, and a third part disposed in the horizontal direction. In this case, the first portion of the second coil may overlap the side wall of the first housing 410 in the vertical direction. In addition, the second portion of the second coil may overlap the lower surface of the magnet in the vertical direction. In addition, the third portion of the second coil may overlap the upper wall of the first housing 410 in the vertical direction and may not overlap the magnet.

7, in the embodiment, at the initial position of the barrel 100 before the driving signal is applied, the center of the first coil, which is the first driving unit 710 in the vertical direction, is the The second driver 720 may be located lower than the center of the magnet.

Accordingly, the first housing 410 may be relatively moved by the repulsive force or attraction force between the second driver 720 and the fourth driver 740. In more detail, the lens barrel 100 is driven by the repulsive force or attraction force between the first drive unit 710 and the second drive unit 720, and the first housing 410 is the second drive unit 720 and the It may be driven by the magnetic force between the fourth drive unit 740. That is, the first driver 710 and the fourth driver 740 may share the second driver 720 with each other.

Accordingly, the camera module according to the present exemplary embodiment may omit the third driver 730 to reduce the required parts and have a simple structure.

In addition, the features, structures, effects, and the like described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be interpreted that the contents related to such a combination and modification are included in the scope of the present invention.

Although described above with reference to the embodiment is only an example and is not intended to limit the invention, those of ordinary skill in the art to which the present invention does not exemplify the above within the scope not departing from the essential characteristics of this embodiment It will be appreciated that many variations and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

Claims (18)

A housing including a first housing including an upper wall and sidewalls extending from the upper wall, and a second housing spaced below the first housing;
A barrel disposed below the upper wall of the first housing;
A first elastic member connecting the barrel and the first housing;
A first coil disposed outside the barrel;
A magnet disposed on an inner surface of a side wall of the first housing and facing the first coil; And
A second coil disposed between the magnet and the second housing;
The magnet includes a bottom surface, an upper surface, and first and second side surfaces disposed between the lower surface and the upper surface,
The width between the first side of the magnet and the second side of the magnet is opposite to the bottom surface of the magnet in a horizontal direction from the first side of the magnet toward the second side of the magnet. Less than the horizontal width of the region of the second coil,
The length of the vertical width of the first side of the magnet in the lower surface direction from the upper surface of the magnet is greater than the length of the vertical width of the area of the first coil facing the first side of the magnet,
In the vertical direction orthogonal to the horizontal direction, the first coil, the second coil and the magnet overlap the upper wall of the first housing,
Lens drive device. The magnet of claim 1, wherein the area of the first coil facing the first side of the magnet is located between the top surface of the magnet and the bottom surface of the magnet when viewed in the horizontal direction.
The first coil is disposed 50mm to 1000㎛ spaced apart from the magnet. The method of claim 2,
The lower surface of the magnet is located between both ends of the region of the second coil facing the lower surface of the magnet when viewed in a vertical direction orthogonal to the horizontal direction. The method of claim 2,
At the initial position of the barrel, the region of the first coil facing the first side of the magnet is located closer to the bottom surface of the magnet relative to the top surface of the magnet. The method of claim 1,
The second side of the magnet is attached to the inner surface of the side wall of the first housing,
When viewed from an upper direction of the housing, the second coil is disposed in the lens spaced apart inward from the outer surface of the second housing. The method of claim 1,
A portion of the second coil facing the upper wall of the first housing is disposed between the side wall of the first housing and the second housing,
And a portion of the second coil faces a lower surface of the side wall of the first housing in a vertical direction orthogonal to the horizontal direction. The method of claim 6,
In the vertical direction, the second coil further comprises a portion facing and overlapping the lower surface of the magnet. The method of claim 7, wherein
And in the vertical direction, the second coil further comprises a portion overlapping the upper wall of the first housing and not overlapping the magnet. The method of claim 1,
The second coil faces the lower surface of the magnet, and the second coil interacts with the magnet such that the first housing moves relative to the second housing in a horizontal direction relative to the second housing. Moving the magnet,
The upper surface of the second coil is disposed lower than the bottom surface of the barrel, the lens driving device disposed between the magnet and the second housing in a vertical direction orthogonal to the horizontal direction. The method of claim 1,
The magnet interacts with the first coil to move the barrel and the first coil relative to the first housing in a vertical direction perpendicular to the horizontal direction,
The length of the vertical width between the lower surface of the magnet and the upper surface of the magnet is greater than the length of the vertical width of the region of the first coil. The method of claim 1,
The second housing includes an opening provided below the barrel,
The lens driving device through which the light incident from the object passes through the opening of the second housing. The method of claim 1,
The second coil is a lens driving device spaced apart from the magnet 50 ㎛ to 1000 ㎛. The method of claim 1,
Further comprising a second elastic member coupled to the first housing and the second housing,
The magnet has a plate shape,
The first coil is fixed to the outside of the barrel,
The second housing is a lens driving device for supporting the second coil. The method of claim 1,
The first coil and the magnet are used to perform a focusing function in which the barrel and the first coil are moved relative to the upper wall of the first housing in a vertical direction orthogonal to the horizontal direction under a focusing function operation. ,
And the magnet and the second coil are used to perform a shake compensation function in which the first housing and the magnet are relatively moved with respect to the second housing in the horizontal direction under a shake compensation function. The method of claim 1,
In a direction from the first side of the magnet toward the second side of the magnet, the distance between the first side of the magnet and the first coil is in the vertical direction orthogonal to the horizontal direction; Longer than the distance between the lower surface and the second coil,
And the lower surface of the magnet faces the second coil directly. According to claim 1,
And a center of the first coil is positioned lower than a center of the magnet in a vertical direction perpendicular to the horizontal direction at an initial position of the barrel before a driving signal is applied. A housing including a first housing including an upper wall and sidewalls extending from the upper wall, and a second housing spaced below the first housing;
A barrel disposed below the upper wall of the first housing;
A first elastic member connecting the barrel and the first housing;
A first coil disposed outside the barrel;
A magnet disposed on an inner surface of a side wall of the first housing and facing the first coil; And
And a second coil disposed between the magnet and the second housing. An information technology device comprising the lens driving device according to any one of claims 1 to 17.

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