Abstract:
A camera lens module according to an embodiment of the present invention is configured to include an autofocus carrier driven by an autofocus driving unit to advance and retreat along an optical axis and having an upper portion open in an optical axis direction; an optical image stabilizer stopper located at the open portion of the autofocus carrier; and an optical image stabilizing carrier configured to accommodate a lens barrier and located between the autofocus carrier and the optical image stabilizer stopper, the optical image stabilizing carrier being driven by an optical image stabilizer driving unit to perform optical image stabilization in a direction perpendicular to the optical axis, wherein a movement of the optical image stabilizing carrier in an optical axis direction is limited by the optical image stabilizer stopper located at the autofocus carrier.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    Field of the Invention 
         [0002]    The present invention relates to a camera lens module mounted on a portable mobile device, and more specifically, to a camera lens module equipped with an optical image stabilizer and an autofocus. 
         [0003]    Background of the Related Art 
         [0004]    A portable terminal such as a latest smart phone (hereinafter, referred to as a ‘mobile’) becomes multi-convergence as music, movies, a TV receiver, games and the like, as well as a simple telephone function, are mounted along with advancement of its technology, and one of factors leading to development of the multi-convergence is a camera lens module. 
         [0005]    The camera lens module mounted on the mobile is changed to a structure equipped with a variety of additional functions such as an autofocus (AF), an optical zoom and the like to catch up with recent changes focusing on high pixel and high functionality in response to user requirements. Particularly, attempts of implementing an optical image stabilizer in a mobile size are progressed from various aspects recently. 
         [0006]    An optical image stabilizer technique is a technique of maintaining optimum resolution of a photographed image by automatically controlling the focus of a correcting lens configuring a camera module to move in a direction corresponding to a hand tremor. An optical image stabilizing actuator for adjusting the focus is mounted on the camera module applied to a mobile, a camcorder or the like to implement the optical image stabilizer technique. 
         [0007]    An optical image stabilizing actuator of a Voice Coil Motor (VCM) type using the interaction between a magnetic field and an electric field is well known. The VCM type actuator generally includes a magnetic circuit configured of a coil and a magnetic material arranged to face each other and performs a correction corresponding to a tremor through plane movement of a mover having a lens installed therein with respect to a stator by using an electromagnetic force generated by the magnetic circuit. 
         [0008]    Generally, a method of applying two pairs of magnetic circuits facing in two axis directions, i.e., four magnetic circuits in total, is employed so that the correction may be performed by moving the mover in the X and Y two axis directions. However, a size of the camera module generally increases and configuration of the device is complicated since a space is needed as much as to apply the four magnetic circuits, and thus it is difficult to achieve miniaturization of a product. 
         [0009]    If the size or the number of parts of the mover is reduced for miniaturization of the module, there is a problem in that preciseness and promptness of the optical image stabilizer are lowered, and, particularly, since the mover is driven beyond a driving range in performing optical image stabilization by using a resultant force of orthogonal forces applied in the X and Y two axis directions or unnecessary rotation occurs when the mover is driven, accuracy of the correction is lowered. 
       SUMMARY OF THE INVENTION 
       [0010]    Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a camera lens module, which can achieve miniaturization of a product through a compact structure and, at the same time, stably and accurately drive and control an optical image stabilizer. 
         [0011]    Another object of the present invention to implement a camera lens module equipped with an optical image stabilizer of high accuracy and preciseness by suppressing movement of a mover exceeding a driving range and unnecessary rotation of the mover in performing optical image stabilization. 
         [0012]    To accomplish the above objects, according to one aspect of the present invention, there is provided a camera lens module including: an autofocus carrier driven by autofocus driving unit to advance and retreat along an optical axis and having an upper portion open in an optical axis direction; an optical image stabilizer stopper located at the open portion of the autofocus carrier; and an optical image stabilizing carrier configured to accommodate a lens barrier and located between the autofocus carrier and the optical image stabilizer stopper, the optical image stabilizing carrier being driven by an optical image stabilizer driving unit to perform optical image stabilization in a direction perpendicular to the optical axis, wherein a movement of the optical image stabilizing carrier in an optical axis direction is limited by the optical image stabilizer stopper located at the autofocus carrier. 
         [0013]    The camera lens module further may include: a base configured to accommodate the autofocus carrier to advance and retreat in the optical axis direction; and an autofocus stopper provided on the base to limit a movement of the autofocus carrier in the optical axis direction. 
         [0014]    In addition, the autofocus driving unit may be located between the optical image stabilizing carrier and the base and the optical image stabilizer driving unit may be located between the optical image stabilizing carrier and the base. 
         [0015]    In addition, the camera lens module further may include: a rolling unit configured to be placed between the autofocus carrier and the optical image stabilizing carrier to support the optical image stabilizing carrier so that the optical image stabilizing carrier moves in a direction vertical to the optical axis. 
         [0016]    The autofocus driving unit may include: an autofocus coil installed at the base; and an autofocus magnet installed at the autofocus carrier to face the autofocus coil. 
         [0017]    In addition, the optical image stabilizer driving unit may include: an autofocus coil installed at the base; and an autofocus magnet installed at the autofocus carrier to face the autofocus coil. 
         [0018]    Further, the autofocus driving unit may include: an coil installed at the base; and an magnet installed at the autofocus carrier to face the coil. 
         [0019]    In addition, the rolling unit may include: two or more supporting pieces respectively provided at a corner of the autofocus carrier in one piece and having a concave accommodating surface formed on a top surface thereof; two or more seating pieces formed on a circumference of the optical image stabilizing carrier in a projected form to be correspondent to the supporting pieces and respectively having a concave accommodating surface formed on a bottom surface thereof; and two or more balls interposed between the supporting piece and the seating piece so that a portion and another portion of the balls are respectively accommodated on the accommodating surfaces of the supporting piece and the seating piece. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]      FIG. 1  is an exploded perspective view showing a camera lens module according to an embodiment of the present invention. 
           [0021]      FIG. 2  is a partially exploded perspective view showing a camera lens module according to an embodiment of the present invention. 
           [0022]      FIG. 3  is a combined perspective view showing a camera lens module according to an embodiment of the present invention. 
           [0023]      FIG. 4  is an incised perspective view showing the camera lens module of  FIG. 3  from the direction of line A-A. 
           [0024]      FIG. 5  is an incised perspective view showing the camera lens module of  FIG. 3  from the direction of line B-B. 
           [0025]      FIG. 6  is a plan view showing a camera lens module without a cover. 
           [0026]      FIG. 7  is a flat cross-sectional view showing the camera lens module of  FIG. 3  from the direction of line C-C. 
           [0027]      FIG. 8  is a perspective view showing a state before combining an optical image stabilizing carrier and an autofocus carrier configuring a camera lens module according to an embodiment of the present invention. 
           [0028]      FIG. 9  is a flat schematic view of a camera lens module according to an embodiment of the present invention, showing an arrangement relation between an autofocus driving unit and an optical image stabilizing drive. 
           [0029]      FIG. 10  is a view showing an operation state related to X-axis direction optical image stabilization of a camera lens module according to an embodiment of the present invention. 
           [0030]      FIG. 11  is a view showing an operation state related to Y-axis direction optical image stabilization of a camera lens module according to an embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0031]    The preferred embodiment of the present invention will be hereafter described in detail, with reference to the accompanying drawings. In describing the present invention, if already known functions or specific descriptions of constitutions related to the present invention may make the spirit of the present invention unclear, detailed descriptions thereof will be omitted. 
         [0032]    For the convenience of explanation, it will be described using a three-axis direction coordinate system, and in describing the figures, the Z-axis is defined as an optical axis direction, the X-axis is defined as an optical image stabilization direction orthogonal to the Z-axis optical axis direction, and the Y-axis is defined as another optical image stabilization direction orthogonal to the X-axis on the same plane. 
         [0033]      FIGS. 1, 2 and 3  are respectively an exploded perspective view, a partially exploded perspective view and a combined perspective view respectively showing a camera lens module according to an embodiment of the present invention, and  FIGS. 4 and 5  are incised perspective views showing the camera lens module of  FIG. 3  from the directions of line A-A and line B-B. In addition,  FIG. 6  is a plan view showing a camera lens module without a cover, and  FIG. 7  is a flat cross-sectional view showing the camera lens module of  FIG. 3  from the direction of line C-C. 
         [0034]    Referring to  FIGS. 1 to 7 , a camera lens module according to an embodiment of the present invention includes a an optical image stabilizing carrier  10  for accommodating a lens barrel  13  and an autofocus carrier  12  for resting the optical image stabilizing carrier  10 . The autofocus carrier  12  having the optical image stabilizing carrier  10  mounted thereon is accommodated in a base  14  to be advanced and retreated along the optical axis direction of a lens, and a cover  11  covers the base  14  which accommodates the carriers  10  and  12  from the top. 
         [0035]    The optical image stabilizing carrier  10  is rested on the autofocus carrier  12  to be movable in the X and Y two axis directions on a plane orthogonal to the optical axis, and a rolling unit  15  is provided between the autofocus carrier  12  and the optical image stabilizing carrier  10  to support stable plane motion orthogonal to the optical axis of the optical image stabilizing carrier  10  with respect to the autofocus carrier  12 , i.e., to support a drive for optical image stabilization. 
         [0036]    When the autofocus carrier  12  on which the optical image stabilizing carrier  10  is rested is seen from the top, it is roughly formed in a shape removing one corner from a rectangular shape having four corners. 
         [0037]    A lens group (not shown) configured of a plurality of lenses is installed in the lens barrel  13 , and a hole (not shown) having a diameter as large as to stably accommodate the lens barrel  13  is provided in the optical image stabilizing carrier  10 . In addition, the base  14  is configured of a bottom unit  140  wrapping the lower surface of the autofocus carrier  12  and side surface units  142  of a rectangular shape wrapping the outer surfaces of the carriers  10  and  12 . 
         [0038]    An opening in which an infrared filter  190  configuring an image sensor module  19  will be placed is formed at the center of the bottom unit  140  of the base  14  wrapping the lower surface of the carrier. In addition, a filter base  192  in which the infrared filter  190  is installed is assembled on the bottom surface of the bottom unit  140  under the opening, and a substrate  196  installed with an image sensor  194  is assembled on the bottom surface of the filter base  192 , and, here, the substrate  196  may be a flexible substrate. 
         [0039]    The optical image stabilizing carrier  10  accommodating the lens barrel  13  is provided in a cylindrical shape, and the base  14  is provided in a hexahedral shape. Accordingly, if the optical image stabilizing carrier  10  is accommodated in the base  14 , four free spaces are generated at the corner areas of the base  14 , and an autofocus driving unit  16  and a shake limiting unit  155  which will be described below are arranged for efficient installation of parts and miniaturization of a product through effective utilization of the free spaces. 
         [0040]    If a portion of the optical image stabilizing carrier  10  provided in a cylindrical shape is cut in the optical axis direction, a good assemblability can be secured since elastic expansion is allowed within a predetermined range although a machining tolerance exists between the outer diameter of the lens barrel  13  and the inner diameter of the optical image stabilizing carrier  10  (e.g., when the outer diameter of the lens barrel is larger than the inner diameter of the optical image stabilizing carrier), and there may be a modification of securing a space for installing parts by removing a portion of the bottom. 
         [0041]    The autofocus driving unit  16  is arranged in a free space of any one of the corner areas among the four free spaces and generates a driving force for moving the autofocus carrier  12  in the optical axis direction, and shake limiting units  155  are arranged in the other three free spaces to prevent deviation of the carriers  10  and  12  in which the lens barrel  13  is installed from the optical axis alignment position when an external shock is applied. 
         [0042]    The autofocus driving unit  16  includes an autofocus coil  160  installed at a corner opposite to a corner where a first side surface  144  and a second side surface  146  of the base  14  in which a portion of the configuration of an optical image stabilizer driving unit  17  described below is installed are orthogonal to each other, a driver  162  arranged on an adjacent lateral side of the coil, and an autofocus magnet  164  installed in a magnet installation unit of the outer surface of the autofocus carrier  12  facing the autofocus coil  160 . 
         [0043]    Since the driver  162  may be provided in a form mounted outside the camera lens module (in a form of a mobile device on which the camera lens module is mounted) in some cases, it can be omitted, and, in this case, an autofocus control sensor for sensing change of position of the autofocus carrier  12  with respect to the base when autofocus is driven may be arranged inside or on an adjacent lateral side of the autofocus coil  160 . 
         [0044]    A pair of optical axis guide devices  18  of a well-known form including a ball B (details thereof are omitted) are arranged on both left and right sides of the autofocus magnet  164  and in the corner areas of the base  14  corresponding thereto to guide optical axis movement of the autofocus carrier  12  with respect to the base  14 , and a back yoke y 3  is arranged on the rear surface of the autofocus magnet  164  to improve driving efficiency by concentrating electromagnetic fields generated by the autofocus coil  160  and a magnet. 
         [0045]    In configuring the optical axis guide device  18 , it is preferable to configure guide surfaces of guide members  180 , which are formed on both side surfaces of the base  14  to be orthogonal to each other with the intervention of an installation unit  147  installed at a corner of the base  14  in which some of the configurations (the autofocus coil) configuring the autofocus driving unit  16  are installed, in an asymmetrical structure (a guide surface on one side has a V-shaped cross section, and a guide surface on the other side has a U-shaped cross section) as shown in  FIG. 7  so that advancing/retreating movement may be smoothly performed in the optical axis direction. 
         [0046]    Since the autofocus coil  160  receives power from a substrate  166  arranged behind thereof and generates an electric field, the autofocus carrier  12  is guided by the pair of guide devices  18  inside the base  14  by a force (Lorentz force) generated from the electric field generated by the autofocus coil  160  and a magnetic field generated by the autofocus magnet  164  and performs steady and stable advancing/retreating movement along the optical axis. 
         [0047]    Hereinafter, the rolling unit which supports stable driving of the autofocus for optical image stabilization is described with reference to  FIG. 8 . 
         [0048]    Referring to  FIG. 8 , the rolling unit  15  includes two or more supporting pieces  128  respectively provided at each corner of the autofocus carrier  12  in one piece and having a concave accommodating surface formed on the top surface, two or more seating pieces  108  formed on the circumference of the optical image stabilizing carrier  10  in a projected form to be correspondent to the supporting pieces  128  and respectively having a concave accommodating surface formed on the bottom surface, and two or more balls B respectively interposed between the supporting piece  128  and the seating piece  108 . 
         [0049]    Specifically, the supporting pieces  128  are formed at both side corners adjacent to the magnet installation unit arranged at one corner of the base  14  in the form of a diagonal line and at a corner opposed in the diagonal direction, and the seating pieces  108  are integrally formed on the circumferential surface of the optical image stabilizing carrier  10  in a form one-to-one corresponding to the supporting pieces  128 . In addition, the ball B is interposed in a form in which a portion and the other portion thereof are respectively accommodated on the accommodating surfaces of the supporting piece  128  and the seating piece  108 . 
         [0050]    The supporting piece  128  and the seating piece  108  are vertically arranged with respect to the optical axis direction after being assembled to form a shake suppressing piece, and two or more concave surface units  148  of a form capable of inserting the shake suppressing piece are respectively provided along the optical axis direction inside the corner of the base  14  corresponding to the shake suppressing piece, and thus the shake suppressing pieces  108  and  128  and the concave surface unit  148  configure the shake limiting unit  155  described above. 
         [0051]    Since autofocus control or optical image stabilization is achieved or excessive shaking or deviation of the carriers  10  and  12  with respect to the base  14  is suppressed by the supporting pieces  128 , the seating pieces  108  and the shake limiting unit  155  configured by the concave surface unit  148  when an inner or outer shock is applied to the camera lens module, shock resistance and reliability can be increased. 
         [0052]    In addition, a mounting unit  102  is assembled to be engaged between the supporting pieces  128  in a form of facing a side surface of each supporting piece  128  projected from the bottom side of the autofocus carrier  12  with a side surface of the mounting unit  102  of the optical image stabilizing carrier  10  described below with the intervention of a predetermined gap, and thus, in the same manner as described above, excessive shaking or deviation of the optical image stabilizing carrier  10  with respect to the autofocus carrier  12  is suppressed when an inner or outer shock is applied. 
         [0053]    The optical image stabilizer driving unit  17  which generates a force for performing a plane motion on the XY plane of the optical image stabilizing carrier  10  with respect to the autofocus carrier  12  is arranged on the other side of the autofocus driving unit  16  so that a proper correction corresponding to a hand tremor may be achieved. Hereinafter, the optical image stabilizer driving unit  17  will be described with reference to  FIG. 9  and previously attached  FIG. 8 . 
         [0054]      FIG. 9  is a view schematically showing an arrangement relation between an autofocus driving unit and an optical image stabilizer driving unit. 
         [0055]    Referring to  FIGS. 8 and 9 , the optical image stabilizer driving unit  17  is configured of coils  170   a  and  170   b  and magnets  172   a  and  172   b  respectively installed on the side surfaces of the base  14  on both sides of a corner opposite, in the diagonal direction, to a corner of the base  14  in which the autofocus coil  160  is installed (referred to as a first side surface  144  and a second side surface  146  for the convenience of explanation) and on the outer surface of the optical image stabilizing carrier  10  facing the side surfaces. 
         [0056]    In addition, the optical image stabilizer driving unit  17  includes yokes  174   a ,  176   a ,  174   b  and  176   b  arranged between the carriers  10  and  12  to be correspondent to the magnets  172   a  and  172   b.    
         [0057]    Specifically, the optical image stabilizer driving unit  17  may be divided into a first optical image stabilizer driving unit  17   a  arranged between the first side surface  144  of the base  14  and the optical image stabilizing carrier  10  to generated a force for moving the optical image stabilizing carrier  10  in the X-axis direction and a second optical image stabilizer driving unit  17   b  arranged between the second side surface  146  of the base  14  orthogonal to the first side surface  144  and the optical image stabilizing carrier  10  to generated a force for moving the optical image stabilizing carrier  10  in the Y-axis direction. 
         [0058]    A proper correction corresponding to a hand tremor is made as the optical image stabilizing carrier  10  performs a plane motion in a direction to which a resultant force is applied on the XY plane of the autofocus carrier  12  by a vector force (the resultant force) of a component of an X-axis direction force generated by the first optical image stabilizer driving unit  17   a  and a Y-axis direction force generated by the second optical image stabilizer driving unit  17   b.    
         [0059]    Specifically, the first optical image stabilizer driving unit  17   a  includes a first coil  170   a  installed on the first side surface  144  of the base  14  and the first magnet  172   a  installed on a mounting surface  102  of the optical image stabilizing carrier  10  facing the first coil  170   a  of the first side surface  144 . In addition, the first optical image stabilizer driving unit  17   a  is provided with first and second yokes  174   a  and  176   a  corresponding to the first magnet  172   a  in a left and right pair and a first position detecting sensor  178   a  for detecting change of position of the first magnet  172   a  with respect to the first coil  170   a.    
         [0060]    The first and second yokes  174   a  and  176   a  are separately installed at one side of the bottom edge of the autofocus carrier  12  to configure an arrangement of a form one-to-one corresponding to each of the areas divided by the optical axis direction central axis line A 1  of the first magnet  172   a . Preferably, the first and second yokes  174   a  and  176   a  are arranged in equal size at positions symmetrical to each other with respect to the axis line A 1 . 
         [0061]    Attractive forces of equal magnitude are applied between the first yoke  174   a  and the first magnet  172   a  and the second yoke  176   a  and the first magnet  172   a  arranged in a symmetrical form with respect to the axis line A 1 , and, accordingly, when the optical image stabilizer is driven, rotation of the optical image stabilizing carrier  10  in one direction on the XY plane is suppressed, and the optical image stabilizing carrier  10  may accurately return to the optical axis center point after the correction. 
         [0062]    That is, since the first and second yokes  174   a  and  176   a , which are installed separately to be correspondent to each of the areas divided by the optical axis direction central axis line of the first magnet  172   a , generate an attractive force between the first and second yokes  174   a  and  176   a  and the first magnet  172   a  when the optical image stabilizing carrier  10  is driven to stabilize an optical image, the optical image stabilizing carrier  10  may perform a stable linear motion without rotation in a direction to which an optical image stabilization driving force is applied. 
         [0063]    The first position detecting sensor  178   a  detects change of position of the first magnet  172   a  with respect to the first coil  170   a . This is a change of magnetic field of the first magnet  172   a , and correction for tremors may be precisely performed by recognizing a position of the optical image stabilizing carrier  10  with respect to the base  14  in real-time and performing a feedback control on the first optical image stabilizer driving unit  17   a  based on the value of the recognized position compared to the initial position. 
         [0064]    The second optical image stabilizer driving unit  17   b  includes a second coil  170   b  installed on the second side surface  146  of the base  14  and the second magnet  172   b  installed on a mounting surface  104  of the optical image stabilizing carrier  10  facing the second coil  170   b  of the second side surface  146 . In addition, the second optical image stabilizer driving unit  17   b  is provided with third and fourth yokes  174   b  and  176   b  corresponding to the second magnet  172   b  in a left and right pair and a second position detecting sensor  178   b  for detecting change of position of the second magnet  172   b  with respect to the second coil  170   b  (refer to  FIG. 11  described below). 
         [0065]    The third and fourth yokes  174   b  and  176   b  are separately installed at the other side of the bottom edge of the autofocus carrier  12  to configure an arrangement of a form one-to-one corresponding to each of the areas divided by the optical axis direction central axis line A 2  of the second magnet  172   b  in the same manner as the first and second yokes  174   a  and  176   a , and, accordingly, when the optical image stabilizer is driven, rotation of the optical image stabilizing carrier  10  in one direction on the XY plane is suppressed, and a restoration force is provided so that the optical image stabilizing carrier  10  may accurately return to the optical axis center point after the correction. 
         [0066]    That is, since the third and fourth yokes  174   b  and  176   b , which are installed separately to be correspondent to each of the areas divided by the optical axis direction central axis line of the second magnet  172   b , generate an attractive force between the third and fourth yokes  174   b  and  176   b  and the second magnet  172   b  when the optical image stabilizing carrier  10  is driven to stabilize an optical image, the optical image stabilizing carrier  10  may perform a stable linear motion without rotation in a direction to which an optical image stabilization driving force is applied. 
         [0067]    The second position detecting sensor  178   b  detects change of position of the second magnet  172   b  with respect to the second coil  170   b . This is a change of magnetic field of the second magnet  172   b , and correction for tremors may be precisely performed by recognizing a position of the optical image stabilizing carrier  10  with respect to the base  14  in real-time and performing a feedback control on the second optical image stabilizer driving unit  17   b  based on the value of the recognized position compared to the initial position. 
         [0068]    Reference numeral  20  refers to an autofocus stopper for preventing Z-axis direction deviation and determining maximum stroke of the carriers  10  and  12  installed with an lens barrel  13  when autofocus is controlled, and reference numeral  22  refers to an optical image stabilizer stopper provided to limit Z-axis movement of the optical image stabilizing carrier  10  when the optical image stabilization is driven. In addition, reference numeral  179  refers to a substrate having a coil installed therein to configure the optical image stabilizer driving unit  17  and supplying power to the coil. 
         [0069]    Although a configuration of providing the autofocus stopper  20  on the top of the base in an assembly type is shown in the figure as an example, the autofocus stopper  20  may be replaced by a step formed on a cover of a position corresponding to the autofocus stopper  20 , and, in this case, it is preferable to attach a damper on the surface of the step so that a shock may be diminished when a carrier is touched. 
         [0070]    In addition, reference symbols y 1 , y 2  and y 4  which are not described refer to back yokes respectively arranged on the rear surfaces of the substrate  166  of the autofocus driving unit  16  and the first and second magnets  172   a  and  172   b  of the first and second optical image stabilizer driving units  17   a  and  17   b  in order to increase driving efficiency when the autofocus and optical image stabilization are driven by concentrating electromagnetic fields. 
         [0071]    Hereinafter, optical image stabilization performed by the optical image stabilizer driving unit of the above configuration is described. 
         [0072]      FIG. 10  is a view showing an operation state related to X-axis direction optical image stabilization of a camera lens module according to an embodiment of the present invention, in which  FIG. 10( a )  is a conceptual view schematically showing the operation principle of the first optical image stabilizer driving unit related to X-axis direction optical image stabilization, and  FIG. 10( b )  is an exploded perspective view of a major portion showing a relation between the first magnet and the first and second yokes when optical image stabilization is performed in the X-axis direction. 
         [0073]    Referring to  FIG. 10( a ) , in a steady state, i.e., when power is not input, the optical image stabilizing carrier  10  maintains an aligned state in which its center exactly corresponds to the optical axis without being skewed to one side with respect to the XY plane on the autofocus carrier  12  owing to the attractive force of the magnetic force generated by the first magnet  172   a  and the second magnet  172   b  toward the first coil  170   a  and second coil  170   b.    
         [0074]    If power is supplied to the first coil  170   a  through the substrate  179  of the optical image stabilizer driving unit  17  in a steady state, a force for advancing and retreating the optical image stabilizing carrier  10  in the X-axis direction is generated by an interaction between the electric field of the first coil  170   a  and the magnetic field of the first magnet  172   a , and this force acts as a force for moving the optical image stabilizing carrier  10  accommodating the lens barrel  13  on the XY plane in correspondence to X-axis direction tremors. 
         [0075]    In the process of correcting X-axis direction tremors, the first position detecting sensor  178   a  recognizes a position of the optical image stabilizing carrier  10  with respect to the base  14  in real-time by detecting change of position of the first magnet  172   a  with respect to the first coil  170   a , and since a feedback control for the first optical image stabilizer driving unit  17   a  is performed based on the value of the recognized position with respect to the initial position, correction for tremors is precisely performed. 
         [0076]    In correcting tremors of the X-axis direction, since the first and second yokes  174   a  and  176   a  are separately installed to configure an arrangement of a form one-to-one corresponding to each of the areas divided by the optical axis direction central axis line of the first magnet  172   a , attractive forces of equal magnitude are applied to the two divided areas as shown in  FIG. 10( b ) , and, accordingly, the optical image stabilizing carrier  10  performs a stable linear motion without rotation. 
         [0077]      FIG. 11  is a view showing an operation state related to Y-axis direction optical image stabilization of a camera lens module according to an embodiment of the present invention, in which  FIG. 11( a )  is a conceptual view schematically showing the operation principle of the second optical image stabilizer driving unit related to Y-axis direction optical image stabilization, and  FIG. 11( b )  is an exploded perspective view of a major portion showing a relation between the second magnet and the third and fourth yokes when optical image stabilization is performed in the Y-axis direction. 
         [0078]    On the contrary to  FIG. 10 , if power is applied to the second coil  170   b  through the substrate  179  of the optical image stabilizer driving unit  17  in a steady state, a force for advancing and retreating the optical image stabilizing carrier  10  in the Y-axis direction is generated by an interaction between the electric field of the second coil  170   b  and the magnetic field of the second magnet  172   b . At this point, this force acts as a force which enables the optical image stabilizing carrier  10  accommodating the lens barrel  13  to counteract Y-axis direction tremors on the XY plane. 
         [0079]    In the same way, in the process of correcting Y-axis direction tremors, the second position detecting sensor  178   b  recognizes a position of the optical image stabilizing carrier  10  with respect to the base  14  in real-time by detecting change of position of the second magnet  172   b  with respect to the second coil  170   b , and since a feedback control for the second optical image stabilizer driving unit  17   b  is performed based on the value of the recognized position with respect to the initial position, correction for tremors is precisely performed. 
         [0080]    Also in correcting tremors of the Y-axis direction, since the third and fourth yokes  174   b  and  176   b  are separately installed to configure an arrangement of a form one-to-one corresponding to each of the areas divided by the optical axis direction central axis line of the second magnet  172   b , attractive forces of equal magnitude are applied to the two divided areas as shown in  FIG. 11( b ) , and, accordingly, the optical image stabilizing carrier  10  performs a stable linear motion without rotation. 
         [0081]    Of course, although it is not shown in detail through the figures, in driving actual optical image stabilization, forces of different magnitudes and directions are simultaneously applied in the X-axis and Y-axis directions by the first optical image stabilizer driving unit  17  and the second optical image stabilizer driving unit  17 , and since the optical image stabilizing carrier  10  moves in a direction of synthesizing the vector components of the X-axis and the Y-axis generated by the first and second optical image stabilizer driving units  17 , the tremors are corrected. 
         [0082]    According to the camera lens module according to an embodiment of the present invention as described above, since the camera lens module has a compact structure added with an autofocus and an optical image stabilizer by efficiently utilizing free spaces (free spaces at the corners) formed between a mover (an optical image stabilizing carrier and an autofocus carrier having a lens barrel mounted thereon) and a stator (a base), both miniaturization and functionality of a product may be satisfied. 
         [0083]    In addition, owing to a plurality of yokes separately arranged in correspondence to optical image stabilizing magnets (the first and second magnets), malfunctions of the mover, such as exceeding a range of optical image stabilization or unnecessary rotation, are suppressed in performing the optical image stabilization, and, accordingly, a highly satisfied camera lens module with high accuracy and preciseness can be provided in performing the optical image stabilization. 
         [0084]    Furthermore, since a configuration of accommodating carriers installed with a lens barrel in a base is constructed, optical axis alignment (active-align) between the lens barrel and the image sensor of the image sensor module assembled in the base is allowed only by adjusting an assembly angle of the image sensor module with respect to the base in the process of assembling a camera lens module, and thus it is advantageous in that a troublesome optical axis alignment process is not separately required. 
         [0085]    Although a configuration of mounting an optical image stabilizing carrier on an autofocus carrier is shown and described as an example, on the contrary, a modification of installing the optical image stabilizing carrier  10  on the base  14  and mounting the autofocus carrier  12  on the optical image stabilizing carrier  10  may also be possible, and, accordingly, such a modification may also be included in the scope of the present invention. 
         [0086]    In the case of such a modification, the rolling unit  15  and the first to fourth yokes  176   a ,  174   a ,  176   b  and  174   b  applied to the embodiment described above may be mounted between the optical image stabilizing carrier  10  and the base  14  to provide a function of driving optical image stabilization and preventing excessive rotation of the optical image stabilizing carrier  10  in the same manner as described above. 
         [0087]    In this case, a penetration hole is formed in the optical image stabilizing carrier  10  of a portion on which the autofocus driving unit is mounted, and the autofocus magnet  164  and the autofocus coil  160  applied to the embodiment may be configured in an arrangement facing each other with the intervention of the penetration hole, and when the penetration hole does not exist, autofocus driving may be implemented by arranging the autofocus driving unit between the optical image stabilizing carrier  10  and the autofocus carrier  12  and applying power to a coil arranged in the optical image stabilizing carrier. 
         [0088]    According the camera lens module according to an embodiment of the present invention, since the camera lens module has a compact structure added with an autofocus and an optical image stabilizer by efficiently utilizing free spaces (free spaces at the corners) formed between a mover (an optical image stabilizing carrier and an autofocus carrier having a lens barrel mounted thereon) and a stator (a base), both miniaturization and functionality of a product may be satisfied. 
         [0089]    In addition, owing to a plurality of yokes separately arranged in correspondence to optical image stabilizing magnets (the first and second magnets), malfunctions of the mover such as exceeding a range of optical image stabilization or unnecessary rotation are suppressed in performing the optical image stabilization, and, accordingly, a highly satisfied camera lens module with high accuracy and preciseness in performing the optical image stabilization can be provided. 
         [0090]    Furthermore, since a configuration of accommodating carriers installed with a lens barrel in a base is constructed, optical axis alignment (active-align) between the lens barrel and the image sensor of the image sensor module assembled in the base is allowed only by adjusting an assembly angle of the image sensor module with respect to the base in the process of assembling a camera lens module, and thus it is advantageous in that a troublesome optical axis alignment process is not separately required. 
         [0091]    The camera lens module of the present invention may be mounted on a portable mobile device. 
         [0092]    While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.