KR20160052880A - Camera module - Google Patents

Abstract

A camera module of the present invention includes: a lens bobbin unit in which a lens is placed; a moving unit which is installed form the lens bobbin unit to be movable in the optical axial direction of the lens in the case of AF driving control; a fixing unit which is installed for the moving unit to be movable in the horizontal direction vertical to the optical axis in the case of OIS driving control; an OIS suspension which elastically supports the moving unit in the horizontal direction; an AF suspension which elastically supports the lens bobbin unit in the axial direction; and a sensing unit which measures the displacement of the lens bobbin unit. The sensing unit measures the relative displacement of a first member and a second member and outputs the relative displacement as a feedback signal for the AF driving control.

Description

Camera module {CAMERA MODULE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera module for photographing a subject, and more particularly to a camera module having an auto-focus adjusting means and an optical image stabilizing means.

A camera module having an auto focusing function that automatically adjusts the focus of a subject when shooting a subject is widely applied to mobile devices such as a mobile phone or a tablet PC as well as a general digital camera.

Recently, a camera module employing a camera shake prevention means has been introduced not only in the auto focus (AF) function but also in the camera. The anti-shake means can be largely classified into an electronic type and an optical type. An electronic image stabilizer (EIS) is an image processing method of an image signal outputted from an image sensor. Optical Image Stabilizer (OIS) is a system that mechanically adjusts the position and angle of an image sensor or lens optical system.

Since the camera module with OIS device is complicated in structure and bulky, it needs to overcome many technical difficulties to be adopted for mobile devices.

Korean Patent Application Publication No. 2007-0065195 discloses a device for compensating for phase shift, but it is structurally difficult to miniaturize for a mobile device such as a smart phone.

Korean Patent Publication No. 2007-0065195

The present invention relates to a camera module that implements an AF (Auto Focusing) function and an OIS (Optical Image Stabilizer) function and is optimized for a mobile device with a small thickness or volume.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

The camera module of the present invention includes a lens bobbin to which a lens is mounted; A moving unit in which the lens bobbin portion is provided so as to be movable in an optical axis direction of the lens during AF drive control; A fixing unit in which the moving unit is installed to be movable in a horizontal direction perpendicular to the optical axis during OIS driving control; An OIS suspension for elastically supporting the moving unit in the horizontal direction; An AF suspension for elastically supporting the lens bobbin portion in the optical axis direction; And a sensing unit for measuring a displacement of the lens bobbin portion, wherein the sensing unit measures a relative displacement between the first member and the second member, and outputs the relative displacement as a feedback signal for the AF drive control have.

The camera module of the present invention includes a lens bobbin to which a lens is mounted; A moving unit in which the lens bobbin portion is provided so as to be movable in an optical axis direction of the lens during AF drive control; A fixing unit in which the moving unit is installed to be movable in a horizontal direction perpendicular to the optical axis during OIS driving control; An OIS suspension for elastically supporting the moving unit in the horizontal direction; An AF suspension for elastically supporting the lens bobbin portion in the optical axis direction; And an AF coil and an AF permanent magnet provided respectively in the lens bobbin portion and the moving unit to move the lens bobbin portion in the optical axis direction, the AF coil and the AF permanent magnet being mounted on the moving unit and the fixing unit, respectively, OIS coil and OIS permanent magnet installed; Wherein an AF sensor provided on the lens bobbin portion and a sensor corresponding portion facing the AF sensor are provided by measuring the displacement of the lens bobbin portion, and the sensor corresponding portion includes the AF permanent magnet or the OIS permanent magnet . ≪ / RTI >

The camera module of the present invention includes a lens bobbin to which a lens is mounted; A moving unit in which the lens bobbin portion is provided so as to be movable in an optical axis direction of the lens during AF drive control; A fixing unit in which the moving unit is installed to be movable in a horizontal direction perpendicular to the optical axis during OIS driving control; An OIS permanent magnet and an OIS coil for driving the moving unit in the horizontal direction; An AF permanent magnet and an AF coil for driving the lens bobbin in the optical axis direction; Wherein an OIS sensor is provided for measuring the horizontal displacement of the moving unit and facing the OIS permanent magnet or the AF permanent magnet, and an AF sensor for measuring the displacement of the lens bobbin in the optical axis direction is provided in the OIS sensor And a sensor corresponding part facing the AF sensor may be provided separately from the OIS permanent magnet or the AF permanent magnet.

The camera module of the present invention is optimized for a mobile device, which corresponds to a lens shift method, and optically corrects image deterioration as well as electronic correction. Therefore, even when the camera is shaken when the exposure time is prolonged, high-quality shooting can be performed without deterioration of the image. In addition, high-quality shooting can be performed even in a low-illuminance environment.

The camera module of the present invention can perform feedback control of AF and OIS by using an AF sensor unit and an OIS sensor unit.

At this time, by using the relative displacement between the first member and the second member as a feedback signal for AF drive control, high-precision AF drive can be realized. In addition, productivity can be improved and miniaturization can be achieved.

1 is a schematic view showing a camera module according to the present invention.
2 is a schematic view showing a state where a case is removed from the camera module of the present invention.
3 is a schematic view showing a fixing unit constituting a camera module of the present invention.
4 is a schematic view showing a lens bobbin part constituting a camera module of the present invention.
5 is a schematic view showing another camera module of the present invention.
6 is a schematic view showing a camera module in which a first member and a second member are provided in a mobile unit;
7 is a schematic view showing another camera module in which the first member and the second member are provided in the mobile unit;
8 is a schematic view showing another camera module of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

1 is a schematic view showing a camera module according to the present invention.

The camera module of the present invention may include a lens bob 330, a moving unit 300, a fixing unit 400, an OIS suspension 110, an AF suspension 310, and a sensing unit.

In order to realize both an auto focusing function (AF) and an optical image stabilizer (OIS) function in which the focus of the lens is automatically adjusted during photographing of a subject, the camera module includes a fixing unit 400 and a moving unit (300) may be included.

One side of an optical axis on which light is incident is referred to as a first side, and the other side of an optical axis through which light is emitted in the direction of an image sensor (not shown) is defined as a second side. In addition, a first axis, a second axis and a third axis which define an xyz orthogonal coordinate system are defined. The optical axis or the first axis corresponds to the z axis, the second axis perpendicular to the optical axis corresponds to the x axis, and the third axis perpendicular to the optical axis corresponds to the y axis.

In the present invention, 'horizontal direction' refers to an x-axis direction or a y-axis direction which is a direction perpendicular to an optical axis. This is extended to define a horizontal direction, which is not perpendicular to the optical axis, but which is directed to the side radial direction of the optical axis, but is also inclined to the optical axis.

If camera shake occurs during camera shooting, it is difficult to shoot an accurate image. There are camera tilting method and lens shift method as means for optically correcting the camera shake.

In the camera tilting method, the camera module including the lens is tilted together with the image sensor so that a virtual axis connecting the subject and the center of the camera module is aligned with the optical axis on which the actual light is incident. However, the camera tilting method has a disadvantage that the bulky and bulky power consumption for tilting driving becomes large. The camera tilting method is simplified so that the image sensor is kept in a still state and the lens is moved in the horizontal direction with respect to the optical axis.

The camera module of the present invention is optimized for a mobile device, and corresponds to a lens shift method. Although a detailed description is omitted, an electronic correction (EIS) is possible, and optical degradation of an image is corrected. Therefore, even when the exposure time is long and the camera is shaken, high-quality shooting can be performed without deterioration of the image. In addition, high-quality shooting can be performed even in a low-illuminance environment.

In the present invention, the lens must be able to move in the optical axis direction in order to perform the auto focus (AF) function. On the other hand, in order to perform optical correction (OIS), the lens must be able to move in the horizontal direction perpendicular to the optical axis. The camera module of the present invention can independently perform the AF function and the OIS function.

The fixing unit 400 may include a body 410 having a substrate 490 facing the image sensor, and a case (not shown).

The main body 410 faces the image sensor disposed on a mobile device or the like, and can form an appearance of the camera module. In addition, the main body 410 provides an assembly base when a camera module is assembled to an external device such as a mobile device, and can support a load or an external force. The case corresponds to a cover that covers the main body 410.

It is possible to define the mobile unit 300, which is an element to be moved with respect to the main body 410 which is a fixed element. The moving unit 300 may include a housing 390, a lens bobbin 330, and an AF actuator.

In one embodiment, a lens bobbin 330, to which a lens (not shown) is mounted during AF drive control, may be mounted on the mobile unit 300 so as to be movable in the optical axis direction. The movable unit 300 can move in the horizontal direction perpendicular to the optical axis with respect to the fixing unit 400 during OIS drive control.

As a result, the lens bobbin 330 can move in the horizontal direction as well as in the optical axis direction. The optical axis direction driving force of the lens bobbin portion 330 is provided by the AF actuator, and the horizontal direction driving force can be provided by the OIS actuator.

In auto focusing, the lens bobbin portion 330 can move in the optical axis direction with respect to the housing 390. The driving force in the optical axis direction of the lens bobbin portion 330 is generated by the AF actuator, and the AF actuator may be independent of whether or not the OIS actuator operates.

The housing 390 may be positioned between the lens bob 330 and the body 410. The lens bobbin portion 330 is located inside the housing 390. Even if the lens bobbin portion 330 is moved in the direction of the optical axis by the AF drive control when the housing 390 is moved in the horizontal direction by the OIS drive control, the lens bobbin portion 330, together with the housing 390, 390). ≪ / RTI >

The housing 390 can be moved in the horizontal direction with respect to the main body 410 at the time of optical image stabilization. The horizontal driving force of the housing 390 is generated by the OIS actuator, and can be independent of whether the AF actuator is operated or not.

The housing 390 may be provided with an AF coil 350 and an AF permanent magnet constituting an AF actuator. Further, either the OIS coil constituting the OIS actuator or the OIS permanent magnet may be provided.

The AF actuators 350, 340a, and 340b may include an AF permanent magnet and an AF coil 350. [ The AF permanent magnet and the AF coil 350 may face each other and may be installed in the housing 390 and the lens bob 330, respectively. For example, an AF permanent magnet may be mounted on the housing 390, and an AF coil 350 may be mounted on the lens bobbin 330. Conversely, the AF coil 350 may be provided in the housing 390, and the AF permanent magnet may be provided in the lens bobbin 330. The AF actuator generates an electromagnetic force for driving the lens bobbin portion 330 in the optical axis direction. The AF actuator can generate the driving force in the optical axis direction of the lens bobbin portion 330 with respect to the movable unit 300 during the auto focusing operation.

The OIS actuators 450a, 450b, 340a, and 340b may include an OIS permanent magnet and OIS coils 450a and 450b. The OIS permanent magnet and the OIS coil can face each other and can be installed in the movable unit 300 and the fixed unit 400, respectively. For example, an OIS permanent magnet may be mounted on the housing 390, and an OIS coil may be mounted on the substrate 490 or the body 410. On the contrary, the OIS coil may be installed in the housing 390, and the OIS permanent magnet may be installed in the main body 410. The OIS actuator generates an electromagnetic force for driving the housing 390 in the horizontal direction. The OIS actuator generates the horizontal driving force of the mobile unit 300 relative to the fixing unit 400 when optical image stabilization is performed.

The AF permanent magnet of the AF actuator and the OIS permanent magnet of the OIS actuator may be provided separately or may be a common permanent magnet fixed to the inside of the housing 390. [ The embodiment which is a common permanent magnet can avoid the distortion of the electromagnetic force due to the interference of the magnetic force and can save the installation space as compared with the embodiment in which the AF permanent magnet of the AF actuator and the OIS permanent magnet of the OIS actuator are provided separately The inertia of the housing 390, which is a moving part, can be reduced, and the power consumption of the actuator can be reduced.

The common permanent magnet may include a pair of first permanent magnets 340a facing each other in the second axial direction and a pair of second permanent magnets 340b facing each other in the third axial direction.

The side surface of the permanent magnet may face the AF coil 350 in a radial direction along the outer periphery or the outer periphery of the lens bob 330. [ The upper surface or the rear surface of the permanent magnet may face the OIS coils 450a and 450b along the optical axis direction.

The OIS coil includes a pair of first OIS coils 450a facing a pair of first permanent magnets 340a and a pair of second OIS coils 450b facing the second permanent magnets 340b can do. The plurality of OIS coils may be a pattern formed on the substrate 490. Therefore, the thickness of the coil can be reduced and the number of assembling steps can be reduced.

Since the lens bobbin 330 needs to be movably installed on the optical axis in the housing 390, the lens bobbin 330 can be elastically supported in the direction of the optical axis, Is required. The AF suspension 310 may be provided as means for elastically supporting the lens bobbin portion 330 in the optical axis direction. In some cases, the AF suspensions 310 may be provided at a plurality of different positions in the optical axis direction. If a plurality of AF suspensions 310 are provided in the direction of the optical axis, skew of the lens bobbin portion 330 can be prevented.

In one embodiment, the AF suspension 310 is made of a metal plate having elasticity, and a part of the metal plate can be cut to facilitate elastic deformation in the optical axis direction. It is preferable that the AF suspension 310 is provided in such a shape as to allow elastic deformation in the first axial direction but inhibit movement of the lens bob 330 along the second and third axial directions. This is to match the optical center of the lens bob 330 with the optical center of the initially set camera module with respect to AF drive displacement, self-deflection or vibration / impact displacement. For example, the AF suspension 310 may be formed in a plate shape extending in the horizontal direction of the optical axis or a linear shape extending in the horizontal direction.

Meanwhile, since the housing 390 must be movable relative to the main body 410, a means for supporting the housing 390 in a horizontal direction with respect to the main body 410 is needed. Also, the weight of the housing 390 should be supported. Here, 'self weight' can be various forms such as a vector of an optical axis direction, a vector of a horizontal direction, a vector of an optical axis and a component of a horizontal direction according to the posture of the camera module. In this embodiment, the OIS suspension 110 may be provided.

The OIS suspension 110 can support the movable unit 300 in a horizontal direction so as to be movable relative to the fixed unit 400.

In one embodiment, the OIS suspension 110 may include a wire spring extending along the optical axis. The OIS suspension 110 can be configured to be able to be wheeled by a shearing force without being stretched or contracted in the direction of the optical axis.

The OIS suspension 110 preferably restrains the moving unit 300 to a fixed position in the optical axis direction with respect to the fixing unit 400. [ To this end, one end of the OIS suspension 110 may be fixed to the mobile unit 300 and the other end of the OIS suspension 110 may be fixed to the fixed unit 400. According to this embodiment, the OIS driving and the AF driving can be independently controlled without mutual influence. Also, it is possible to support the self weight of the mobile unit 300 and to prevent skewing of the mobile unit 300 with respect to the optical axis. In addition, the OIS suspension 110 can secure the self-weight support and the shock / vibration response force of the moving part while permitting the OIS drive displacement of the mobile unit 300.

In one embodiment, the OIS suspension 110 may be provided in plurality along the outer or outer periphery of the mobile unit 300. If the mobile unit 300 has a polygonal shape such as a quadrangle in a plan view, the OIS suspension 110 may be disposed at the corner of the polygon. It is preferable that the lengths of the plurality of OIS suspensions 110 are the same. According to this, skew of the lens bobbin 330 can be prevented even if horizontal displacement of the mobile unit 300 occurs due to the OIS driving.

One end of the OIS suspension 110 may be installed in the AF suspension 310 that supports the lens bobbin 330 in the moving unit 300 so as to be movable in the optical axis direction.

The other end of the OIS suspension 110, which is fixed at one end to the moving unit 300, may be fixed to the fixing unit 400.

The moving unit 300 may be provided with a member requiring electric power such as the AF coil 350. [ According to the camera module of the present invention, the OIS suspension 110 may exist as an element contacting both the fixing unit 400 and the mobile unit 300 installed in the external device. Therefore, if the power required by the mobile unit 300 is supplied from an external device such as a mobile device through the fixed unit 400, the conveyance path through which the OIS suspension 110 provides the corresponding power to the mobile unit 300 .

The fixing unit 400 may be provided with a substrate 490 on which a pattern for providing power is formed. The other end of the OIS suspension 110 may be fixed to the substrate 490.

The OIS suspension 110 should be formed so as not to be stretched along the optical axis direction but elastically deformed in the horizontal direction. In addition, since the OIS suspension 110 is required to be installed in a small space so as to be elastically deformable in the horizontal direction, a wire shape having sufficient elasticity is suitable. To this end, the OIS suspension 110 may have a Young's modulus of 90000 to 150000 N / mm < 2 >. On the other hand, the OIS suspension 110 may have a reaction force of 19 to 27 mN. The OIS suspension 110 preferably has a diameter of 0.030 mm or more and a wire shape of 0.130 mm or less. Therefore, since the installation space is very narrow, it has a diameter smaller than 100 microns, which is the diameter of the hair, and has sufficient elasticity in the horizontal direction and can eliminate the deformation in the vertical direction.

The OIS suspension 110 may include at least one of copper (Cu), tin (Sn), phosphorous (P), beryllium (Be), and nickel (Ni). In order to prevent the OIS suspension 110 from being oxidized, the OIS suspension 110 may be coated with at least one of tin, silver, gold, and copper.

At this time, if the diameter of the OIS suspension 110 is 0.080 mm or more, the thickness of the coating may be 0.5 탆 or more within a range satisfying the set Young's modulus. If the diameter of the OIS suspension 110 is less than 0.080 mm, the thickness of the coating may be 0.3 탆 or more within a range satisfying the set Young's modulus.

In order to precisely control the displacement of the lens bobbin 330 with respect to the movable unit 300 or the displacement of the movable unit 300 with respect to the fixed unit 400 during the OIS drive control in the AF drive control, , 230, 240 may be used.

The sensing unit can measure the displacement of the lens bobbin portion 330. At this time, the sensing unit may include sensors of various configurations capable of measuring the displacement of the lens bob 330.

In one embodiment, the sensing unit can measure the relative displacement of the first member and the second member, instead of directly measuring the movement of the lens, the housing 390, and the like provided in the lens bob 330. [ The upper relative displacement can be output as a feedback signal for AF drive control or OIS drive control. The feedback signal output from the sensing unit may be used for feedback control during the OIS driving of the mobile unit 300 moving together with the lens bob 330 during the AF operation of the lens bob 330. [

The first member and the second member may be respectively installed on two elements moving relative to each other in the camera module. The lens bobbin 330 and the mobile unit 300 may be relatively moving elements in the camera module. Alternatively, the moving unit 300 and the fixing unit 400 may be other elements that move relative to each other. For example, when the first member is fixed to the lens bobbin 330 and the second member is fixed to the moving unit 300, the sensing unit can detect the relative displacement of the lens bob 330 and the moving unit 300 It is possible to obtain the optical axis displacement of the lens bobbin 330 corresponding to the optical axis, that is, the AF displacement. Therefore, in this case, the sensing unit can output an AF feedback signal necessary for AF drive control. As another example, when the first member is fixedly mounted to the movable unit 300 and the second member is fixedly attached to the fixed unit 400, the sensing unit corresponds to the relative displacement of the movable unit 300 and the fixed unit 400 I.e., the OIS displacement, of the lens bob 330. [ Therefore, in this case, the sensing unit can output an OIS feedback signal necessary for OIS drive control.

The sensing unit may be formed separately from the first member and the second member, or may be integrally formed with the first member or the second member. For example, a case where the first member and the second member are formed integrally with the sensing unit is disclosed in the drawings.

1, the sensing unit may include an OIS sensor 210 for outputting an OIS feedback signal, and permanent magnets 340a and 340b. At this time, the permanent magnets 340a and 340b are elements that generate an output signal of the OIS sensor 210, and may be elements that react with the AF coil or the OIS coil during AF driving or OIS driving. Elements such as the permanent magnets 340a and 340b which cause the output signal of the OIS sensor 210 are referred to as a sensor correspondence unit 240. [ The sensor correspondence unit 240 may be provided separately from the AF actuator and the OIS actuator, unlike in FIG.

In one embodiment, the OIS sensor 210 may include an Hall sensor, and the sensor counterpart 240 may include a permanent magnet that changes the output signal of the hall sensor. Since the OIS sensor 210 is for measuring the horizontal displacement of the lens bob 330 or the moving unit 300, the OIS sensor 210 and the permanent magnets are disposed at different positions along the optical axis direction Can be installed. The OIS sensor 210 is installed on the substrate 490 or the body 410 positioned below the case or the permanent magnet disposed on the upper side of the permanent magnet. The OIS sensor 210 is installed in the lens bobbin 330 or the moving unit 300, . That is, the OIS sensor 210 constitutes one of the first member and the second member, and the sensor corresponding portion 240 can constitute the other of the first member and the second member.

The sensing unit for generating the AF feedback signal may include an AF sensor 230 for outputting an AF feedback signal and a sensor counterpart 240 for generating an output signal of the OIS sensor 210. Hereinafter, this will be described in detail. Although the following description is based on the AF sensor 230, it is reminded that the contents of the AF sensor 230 may also be applied to the OIS sensor 210.

2 is a schematic view showing a state in which a case is removed from the camera module of the present invention.

The first member and the second member may include a sensor corresponding portion 240 and an AF sensor 230 facing each other. The AF sensor 230 can output a relative displacement with respect to the sensor counterpart 240 as an electric signal, and the electric signal at this time can be used as a feedback signal for OIS drive control or AF drive control. The sensor counterpart 240 may be an element that can cause the output of the AF sensor 230 to change.

In one embodiment, the AF sensor 230 may include a Hall sensor, wherein the sensor counterpart 240 may include a permanent magnet that applies a magnetic field to the Hall sensor. If the AF sensor 230 is a laser range finder, the sensor counterpart 240 may include a reflector that reflects the laser.

The AF sensor 230 may be fixed to the fixed unit 400 to generate an AF feedback signal. Corresponding to this, the sensor corresponding portion 240 is provided in the lens bob 330 and can be moved in the direction of the optical axis together with the lens bob 330 in the AF drive control.

When the lens bobbin portion 330 moves along the optical axis direction during AF driving, the sensor corresponding portion 240 moves, and the output of the AF sensor 230 may fluctuate as the sensor corresponding portion 240 moves. The output of the AF sensor 230 fluctuating in this manner may indicate the displacement of the lens bobbin 330 in the optical axis direction.

3 is a schematic view showing a fixing unit 400 constituting a camera module according to the present invention.

The fixing unit 400 may be provided with OIS coils 450a and 450b for moving the moving unit 300 in the horizontal direction during the OIS driving control. The AF sensor 230 provided on the fixing unit 400 together with the OIS coil can output a signal interfered by the magnetic field of the OIS coil. In order to avoid the interference of the OIS coil, it is preferable that the AF sensor 230 is disposed at a place where the interference of the OIS coil is weak.

The OIS coils may be arranged in plural in the fixing unit 400. [ At this time, the magnetic field of each OIS coil can be offset from each other between the adjacent OIS coils. Therefore, it is preferable that the AF coils 350 are disposed between adjacent OIS coils.

The AF sensor 230 may be adjacent to a vertex of the facing surface (first surface) facing the moving unit 300 in the fixing unit 400. In this case, The OIS coil for moving the mobile unit 300 in the horizontal direction in the OIS drive control can be disposed near the side of the first surface.

OIS permanent magnets 340a and 340b for moving the movable unit 300 in the horizontal direction in the OIS drive control corresponding to the OIS coil may be provided. The OIS permanent magnets may be arranged in plural in the moving unit 300 so as to correspond to the OIS coil. At this time, the sensor support unit 240 may be disposed between adjacent OIS permanent magnets. Accordingly, the phenomenon that the magnetic field applied to the AF sensor 230 in the sensor corresponding portion 240 is interfered with by the OIS permanent magnet can be reduced.

According to the above configuration, the OIS permanent magnet generating the horizontal driving force of the moving unit 300 or the AF permanent magnet generating the optical axis driving force of the lens bob 330 can be disposed in the moving unit 300.

The OIS permanent magnets or AF permanent magnets are arranged in plural along the outer periphery of the lens bobbin portion 330 and can be respectively disposed on the sides of the movable unit 300. The sensor corresponding part 240 may be disposed at a corner of the mobile unit 300. [ Preferably, the OIS permanent magnet and the AF permanent magnet are integrally formed. According to this, the first permanent magnet 340a and the second permanent magnet 340b described above will also function as the AF permanent magnet and the OIS permanent magnet.

In addition, a damping unit 480 including an elastic material may be provided on a surface of the fixing unit 400 that faces the moving unit 300. The damping unit 480 can absorb an impact due to a collision between the fixed unit 400 and the movable unit 300. According to the damping unit 480, damage to the lens bobbin 330, the moving unit 300, the fixing unit 400, and the OIS suspension 110 due to the collision can be prevented. Particularly, when the damping unit 480 is disposed adjacent to the AF sensor 230, a collision with the AF sensor 230 during the approach of the fixed unit 400 and the movable unit 300 is prevented, The AF sensor 230 can be protected.

4 is a schematic view showing a lens bobbin part 330 constituting the camera module of the present invention.

The AF coil 350 for generating the optical axis driving force or the AF driving force of the lens bobbin 330 may be wound around the lens bobbin 330. [ At this time, in order to minimize the interference by the AF coil 350, the sensor correspondence portion 240 may be disposed outside the AF coil 350.

A guide portion 360 for fixing the sensor corresponding portion 240 may be provided at a corner of the lens bobbin portion 330. The guide portion 360 may have various configurations for fixing the sensor corresponding portion 240.

In one embodiment, the guide unit 360 may include a first guide 361 and a second guide 362 provided at different positions in the optical axis direction.

At this time, the sensor support portion 240 may extend along the optical axis direction from the first guide 361 toward the second guide 362. [ The sensor support portion 240 can be held in the guides 361 and 362.

When the sensor corresponding portion 240 includes a permanent magnet, it is preferable that the permanent magnet is polarized in the horizontal direction in order to strengthen the magnetic field applied to the AF sensor 230 portion. For example, in FIG. 4, the lower surface of the sensor corresponding portion 240 may be an N pole and the upper surface may be an S pole, or vice versa.

The first guide 361 and the second guide 362 may have a shape protruding radially from the circular shape when the AF coil 350 is wound in a circular shape along the outer periphery of the lens bob 330. [ According to this, the sensor corresponding portion 240 can be disposed between the guides 361 and 362 in a state in which mechanical interference and magnetic field interference with the AF coil 350 are dispensed with.

An embodiment has been described in which the AF sensor 230 is provided in the fixing unit 400 and the sensor corresponding portion 240 is provided in the lens bob 330. [ The positions of the AF sensor 230 and the sensor response unit 240 may be variously changed according to business policies and the like.

5 is a schematic view showing another camera module of the present invention.

2, the sensor counterpart 240 may be fixed to the fixing unit 400 in place of the AF sensor 230. Referring to FIG. The AF sensor 230 is installed in the lens bobbin 330 and can be moved in the direction of the optical axis together with the lens bobbin 330 during AF drive control. According to such a configuration, the distance between the AF sensor 230 and the sensor corresponding portion 240 can be changed according to the movement of the AF sensor 230 as in the embodiment of FIG.

5, the output signal (AF feedback signal) of the AF sensor 230 or the driving power of the AF sensor 230 needs to flow through the AF suspension 310 or the OIS suspension 110 . For this purpose, the AF suspension 310 or the OIS suspension 110 preferably includes a conductive material.

Fig. 6 is a schematic view showing a camera module in which the first member and the second member are provided in the mobile unit 300. Fig.

In Fig. 6, the first member and the second member are both provided in the mobile unit 300. In Fig.

In one embodiment, the AF sensor 230 is fixed to the mobile unit 300 and may be located at a predetermined position in the optical axis direction during the AF drive control. That is, the AF sensor 230 may have the same position in the first axis direction.

The sensor corresponding portion 240 corresponding to the AF sensor 230 is installed in the lens bobbin portion 330 and can be moved in the optical axis direction together with the lens bobbin portion 330 in the AF drive control.

According to such a configuration, since the output of the AF sensor 230 is changed in accordance with the movement of the sensor corresponding portion 240, the AF feedback signal can be obtained.

According to the comparative example in which one of the first member and the second member is disposed in the fixed unit 400 and the other is disposed in the movable unit 300, not only during the AF drive control but also during the OIS drive control, The output signal of the amplifier 230 can be varied. This problem does not occur when the AF sensor 230 is a laser distance meter, but such a problem may occur when the AF sensor 230 is a hall sensor. This is because the output value of the hall sensor fluctuates not only when the relative displacement occurs along the direction from the AF sensor 230 to the sensor corresponding portion 240 but also when the relative displacement occurs along the direction perpendicular to the upward direction to be.

Both the first member and the second member can be installed in the mobile unit 300 to avoid such a problem. In this case, even if the AF sensor 230 includes a hall sensor, an accurate AF feedback signal can be generated in the AF sensor 230 without any problem.

However, according to this configuration, a line through which the driving power of the AF sensor 230 and the feedback signal are communicated needs to be provided in the OIS suspension 110 and the AF suspension 310 as in Fig.

Fig. 7 is a schematic view showing another camera module in which the first member and the second member are provided in the mobile unit 300. Fig.

Referring to FIG. 7, the sensor corresponding part 240 is fixed to the moving unit 300, and may be located at a predetermined position in the direction of the optical axis during AF drive control.

The AF sensor 230 is provided in the lens bobbin 330 in correspondence with the sensor counterpart 240 and can be moved along the optical axis direction together with the lens bobbin 330 in the AF drive control.

7, an accurate AF feedback signal can be output from the AF sensor 230 despite the horizontal movement of the lens bob 330, similar to the embodiment of FIG.

When the movable unit 300 is provided with the first permanent magnet 340a or the second permanent magnet 340b for driving the optical axis of the lens bob 330, the AF coil 350, which reacts with each permanent magnet, And may be provided in the hollow portion 330. Therefore, the lens bobbin 330 may be provided with wiring for the AF coil 350, which is electrically connected to the OIS suspension 110 and the AF suspension 310.

7, when the AF sensor 230 is provided in the lens bobbin 330, the wirings provided in the lens bobbin portion 330 are not required to be provided in the moving unit 300, . Of course, the wiring connected to the AF sensor 230 in the lens bob 330 may be separated from the AF coil 350. [

2 to 7, the AF sensor 230 for measuring the displacement of the lens bob 330 in the optical axis direction is provided separately from the OIS sensor 210. [ In addition, the sensor counterpart 240 facing the AF sensor 230 may be provided separately from the OIS permanent magnet or the AF permanent magnet. According to this configuration, not only the OIS drive displacement of the lens bobbin portion 330, but also the AF drive displacement can be accurately measured independently of each other. In addition, by separating the sensor corresponding portion 240 from the OIS permanent magnet or the AF permanent magnet, it is possible to accurately measure the OIS drive displacement or the AF drive displacement even if a problem occurs in the OIS permanent magnet or the AF permanent magnet.

Of course, if the reliability of the AF permanent magnet or the OIS permanent magnet fixed to the mobile unit 300 is ensured, the sensor corresponding portion 240 may be replaced with each permanent magnet.

8 is a schematic view showing another camera module of the present invention.

8, by measuring the displacement of the lens bob 330, the AF sensor 230 installed in the lens bob 330 and the sensor counterpart 240 facing the AF sensor 230 .

At this time, the sensor responding unit 240 may include an AF permanent magnet or an OIS permanent magnet.

Referring to FIG. 8, a first permanent magnet 340a or a second permanent magnet 340b commonly used as the AF permanent magnet and the OIS permanent magnet functions as the sensor corresponding portion 240. [

According to this configuration, it is possible to measure the displacement in the optical axis direction of the lens bobbin portion 330 within a range in which the reliability of the first permanent magnet 340a or the second permanent magnet 340b is ensured.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

110 ... OIS Suspension 210 ... OIS sensor
230 ... AF sensor 240 ... sensor correspondence part
300 ... Mobile unit 310 ... AF suspension
330 ... lens bobbin portion 340a ... first permanent magnet
340b ... second permanent magnet 350 ... AF coil
360 ... guide portion 361 ... first guide
362 ... second guide 390 ... housing
400 ... fixing unit 410 ... body
450a ... First OIS coil 450b ... Second OIS coil
490 ... substrate

Claims (15)

A lens bobbin to which the lens is mounted;
A moving unit in which the lens bobbin portion is provided so as to be movable in an optical axis direction of the lens during AF drive control;
A fixing unit in which the moving unit is installed to be movable in a horizontal direction perpendicular to the optical axis during OIS driving control;
An OIS suspension for elastically supporting the moving unit in the horizontal direction;
An AF suspension for elastically supporting the lens bobbin portion in the optical axis direction; And
And a sensing unit for measuring a displacement of the lens bobbin portion,
Wherein the sensing unit measures a relative displacement between the first member and the second member, and outputs the relative displacement as a feedback signal for the AF drive control.
The method according to claim 1,
Wherein the first member and the second member include a sensor corresponding portion and an AF sensor facing each other,
Wherein the AF sensor is fixed to the fixing unit,
Wherein the sensor corresponding portion is provided in the lens bobbin portion and is moved in the optical axis direction together with the lens bobbin portion during the AF drive control,
And the output of the AF sensor varies in accordance with the movement of the sensor corresponding portion.
3. The method of claim 2,
An OIS coil for moving the movable unit in the horizontal direction during the OIS drive control is provided,
Wherein the OIS coils are disposed in a plurality of the fixing units,
Wherein the AF sensor is disposed between adjacent OIS coils.
3. The method of claim 2,
Wherein the AF sensor is adjacent to a vertex of a first surface facing the moving unit in the fixed unit,
An OIS coil for moving the movable unit in the horizontal direction during the OIS drive control is provided,
Wherein the OIS coil is disposed on a side of the first surface.
3. The method of claim 2,
An OIS permanent magnet for moving the movable unit in the horizontal direction during the OIS drive control is provided,
Wherein the OIS permanent magnets are disposed in a plurality of the moving units,
Wherein the sensor corresponding portion is disposed between adjacent OIS permanent magnets.
3. The method of claim 2,
An OIS permanent magnet generating a driving force of the movable unit or an AF permanent magnet generating a driving force of the lens bobbin portion,
Wherein the OIS permanent magnet or the AF permanent magnet are arranged in plural along the outer periphery of the lens bobbin part,
Wherein the sensor corresponding portion is disposed at a corner of the mobile unit.
3. The method of claim 2,
An AF coil for generating a driving force of the lens bobbin portion is wound around the outer periphery of the lens bobbin portion,
And the sensor corresponding portion is disposed outside the AF coil.
3. The method of claim 2,
And a guide portion for fixing the sensor corresponding portion is provided at a corner of the lens bobbin portion.
3. The method of claim 2,
A first guide and a second guide provided at different positions in the optical axis direction are provided in the lens bobbin portion,
And the sensor corresponding portion extends along the optical axis direction from the first guide toward the second guide.
The method according to claim 1,
Wherein the first member and the second member include a sensor corresponding portion and an AF sensor facing each other,
The sensor corresponding portion is fixed to the fixing unit,
Wherein the AF sensor is provided in the lens bobbin portion and is moved in the optical axis direction together with the lens bobbin portion in the AF drive control,
Wherein the distance between the AF sensor and the sensor corresponding part is changed according to movement of the AF sensor.
11. The method of claim 10,
Wherein the driving power of the AF sensor or the feedback signal flows through the AF suspension or the OIS suspension.
The method according to claim 1,
Wherein the first member and the second member include a sensor corresponding portion and an AF sensor facing each other,
Wherein the AF sensor is fixed to the moving unit and is located at a predetermined position in the optical axis direction during the AF drive control,
Wherein the sensor corresponding portion is provided in the lens bobbin portion and is moved in the optical axis direction together with the lens bobbin portion during the AF drive control,
And the output of the AF sensor varies in accordance with the movement of the sensor corresponding portion.
The method according to claim 1,
Wherein the first member and the second member include a sensor corresponding portion and an AF sensor facing each other,
Wherein the sensor corresponding portion is fixed to the moving unit and is located at a predetermined position in the optical axis direction during the AF drive control,
Wherein the AF sensor is disposed in the lens bobbin portion and is moved in the optical axis direction together with the lens bobbin portion in the AF drive control,
Wherein the distance between the AF sensor and the sensor corresponding part is changed according to movement of the AF sensor.
A lens bobbin to which the lens is mounted;
A moving unit in which the lens bobbin portion is provided so as to be movable in an optical axis direction of the lens during AF drive control;
A fixing unit in which the moving unit is installed to be movable in a horizontal direction perpendicular to the optical axis during OIS driving control;
An OIS suspension for elastically supporting the moving unit in the horizontal direction;
An AF suspension for elastically supporting the lens bobbin portion in the optical axis direction;
An AF coil and an AF permanent magnet provided respectively in the lens bobbin portion and the moving unit to move the lens bobbin portion in the optical axis direction;
An OIS coil and an OIS permanent magnet respectively installed in the moving unit and the fixing unit to move the moving unit in the horizontal direction; / RTI >
Wherein an AF sensor provided at the lens bobbin portion and a sensor corresponding portion facing the AF sensor are provided by measuring a displacement of the lens bobbin portion,
Wherein the sensor corresponding portion includes the AF permanent magnet or the OIS permanent magnet.
A lens bobbin to which the lens is mounted;
A moving unit in which the lens bobbin portion is provided so as to be movable in an optical axis direction of the lens during AF drive control;
A fixing unit in which the moving unit is installed to be movable in a horizontal direction perpendicular to the optical axis during OIS driving control;
An OIS permanent magnet and an OIS coil for driving the moving unit in the horizontal direction;
An AF permanent magnet and an AF coil for driving the lens bobbin in the optical axis direction; / RTI >
An OIS sensor is provided which faces the OIS permanent magnet or the AF permanent magnet and measures the horizontal displacement of the moving unit,
An AF sensor for measuring the displacement of the lens bobbin in the optical axis direction is provided separately from the OIS sensor,
Wherein the sensor corresponding part facing the AF sensor is provided separately from the OIS permanent magnet or the AF permanent magnet.

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