Patent Publication Number: US-11665421-B2

Title: Camera module having image sensor located between first and second circuit boards

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 17/081,424, filed Oct. 27, 2020, which is a continuation of U.S. application Ser. No. 16/097,184, filed Oct. 26, 2018, now U.S. Pat. No. 10,848,657, issued Nov. 24, 2020, which is the National Phase of PCT International Application No. PCT/KR2017/004573, filed on Apr. 28, 2017, which claims priority under 35 U.S.C. 119(a) to Patent Application No. 10-2016-0052784, filed in the Republic of Korea on Apr. 29, 2016, Patent Application No. 10-2016-0060304, filed in the Republic of Korea on May 17, 2016 and Patent Application No. 10-2017-0009288, filed in the Republic of Korea on Jan. 19, 2017, all of which are hereby expressly incorporated by reference into the present application. 
    
    
     TECHNICAL FIELD 
     Embodiments relate to a camera module and a portable device including the same. 
     This disclosure relates to an image sensor package and a camera device including the same. More particularly, this disclosure relates to an image sensor package capable of simplifying a process and minimizing a thickness thereof, and a camera device including the same. 
     BACKGROUND ART 
     The content described in this part merely provides background information related to embodiments and does not constitute the related art. 
     A mobile phone or a smart phone, equipped with a camera module which functions to photograph a subject and to store a still image or a moving image of the subject, has been developed. Generally, the camera module may include a lens, an image sensor module, and a lens moving device, which adjusts the distance between the lens and the image sensor module. 
     The lens moving device may perform auto-focusing to adjust the focal length of the lens by adjusting the distance between an image sensor and the lens. 
     In addition, the camera module may shake minutely due to, for example, shaking of the user&#39;s hand while photographing a subject. In order to correct distortion of a still image or a moving image due to the shaking of the user&#39;s hand, a lens moving device, to which an optical image stabilizer (OIS) function is added, has been developed. 
     Meanwhile, with the miniaturization of the camera module, it has become possible to install the camera module in various electronic devices as well as mobile devices. Recently, as a mobile device capable of improving a communication environment thereof and performing video communication becomes popular, the development of a front camera module having a high-resolution image sensor capable of supporting high-definition video communication has been demanded. 
     Typically, the front camera module is located in the bezel portion of a mobile device. However, the front camera module having a high-resolution image sensor is larger than a conventional front camera module having a low-resolution image sensor. Thus, when the front camera module having a high-resolution image sensor is installed in order to realize high-definition video communication, the size of a bezel in the mobile device increases and it is difficult to miniaturize the device and to reduce the size of the bezel. 
     Technical Object 
     Embodiments relate to a camera module having a slim overall structure and a portable device including the same. 
     The technical objects acquired by the embodiments are not limited to the technical objects mentioned above, and other unmentioned technical objects will be clearly understood by those skilled in the art, to which the embodiments belong, from the following description. 
     Embodiments provide a camera module capable of reducing the size thereof and preventing optical tilt. 
     This disclosure provides an image sensor package capable of simplifying a manufacturing process and reducing the overall thickness thereof and a camera device including the same. 
     The technical objects acquired by this disclosure are not limited to the technical objects mentioned above, and other unmentioned technical objects will be clearly understood by those skilled in the art, to which this disclosure belongs, from the following description. 
     Technical Solution 
     According to one embodiment, a camera module includes: a lens moving device including a base provided at an underside thereof; a first holder coupled to the base and provided with a filter; an image sensor coupled to an underside of the first holder; and 
     a second holder coupled to the first holder and configured to surround the image sensor, wherein the first holder and the second holder are coupled and electrically connected to each other by a conductive adhesive. 
     The lens moving device may include a bobbin provided so as to move in a first direction; a first coil provided on an outer circumferential surface of the bobbin; a housing inside which the bobbin is provided; a first magnet coupled to the housing; an upper elastic member provided at an upper side of the bobbin to support the bobbin; a lower elastic member provided at a lower side of the bobbin to support the bobbin; the base disposed below the bobbin; and a printed circuit board seated on the base. 
     The conductive adhesive may be provided as an anisotropic conductive film (ACF). 
     The first holder and the image sensor may be coupled and electrically connected to each other through a flip chip process. 
     The first holder and the image sensor may be coupled and electrically connected to each other by a conductive adhesive. 
     According to the embodiment, the camera module may further include a reinforcement member coupled to a lower surface of the second holder. 
     The image sensor may be formed with a printed terminal unit, which is adhered to the conductive adhesive and is coupled and electrically connected to the first holder. 
     The second holder may include a connection board for electrical connection with an external device. 
     The filter may be an infrared-blocking filter or a blue filter. 
     The second holder may be formed with a hollow region and the image sensor may be accommodated in the hollow region. 
     According to the embodiment, the camera module may further include a reinforcement member disposed below the second holder. 
     The lens moving device may further include: a support member disposed on a side surface of the housing to support movement of the housing in a second direction and/or a third direction; and a second coil disposed so as to be opposite the first magnet. 
     According to another embodiment, a camera module includes: a lens barrel provided with at least one lens; a bobbin configured to accommodate the lens barrel therein; a cover member configured to accommodate the bobbin therein; a first holder disposed below the bobbin and provided with a filter; an image sensor coupled to an underside of the first holder and provided with a sensing unit, which is disposed so as to be opposite the filter in a first direction; and a second holder coupled to the first h older and configured to surround the image sensor, wherein the first holder and the second holder are coupled and electrically connected to each other by a conductive adhesive, and wherein the image sensor is accommodated in a hollow region formed in the second holder, and a reinforcement member is provided on a lower surface of the second holder so as to close the hollow region. 
     According to still another embodiment, a camera module includes: a lens moving device including a base at an underside thereof; a first holder coupled to the base and provided with a filter; an image sensor coupled to an underside of the first holder and provided with a sensing unit, which is disposed so as to be opposite the filter in a first direction; and a second holder coupled to the first holder and configured to surround the image sensor, wherein the first holder and the second holder are coupled and electrically connected to each other by a conductive adhesive, and wherein the image sensor is accommodated in a hollow region formed in the second holder, and a reinforcement member is provided on a lower surface of the second holder so as to close the hollow region. 
     According to an embodiment, a portable device includes a display module including a plurality of pixels, a color of which is varied by an electric signal; the camera module configured to convert an image introduced through a lens into an electric signal; and a controller configured to control an operation of the display module and the camera module. 
     A camera module according to an embodiment includes: a first printed circuit board; first adhesive members disposed on the first printed circuit board so as to be spaced apart from each other; a second printed circuit board adhered at a lower edge thereof to the first adhesive member; an image sensor coupled to a lower portion of the second printed circuit board and disposed between the first adhesive members; a filter disposed on the second printed circuit board; and a housing disposed on an upper edge of the second printed circuit board. 
     For example, the centerline of the lower cross section of the housing may be disposed in an area in which it coincides with the centerline of the first adhesive member in a vertical direction. 
     For example, the first adhesive member may be a solder ball. 
     For example, a second adhesive member may be disposed between the upper surface of the second printed circuit board and the lower cross section of the housing. 
     For example, the second adhesive member may include at least one of thermosetting epoxy or UV curing epoxy. 
     For example, the second printed circuit board may be formed with a groove, into which the lower end of the housing is inserted. 
     For example, a protrusion may be formed on the upper outer side of the second printed circuit board so as to abut the outer lower end of the housing. 
     For example, the image sensor may be flip-chip bonded to the second printed circuit board. 
     For example, an infrared-blocking layer may be disposed on the surface of the filter. 
     For example, the camera module may further include a lens holder coupled inside the housing and having at least one lens disposed therein. 
     For example, the camera module may further include a passive element disposed on the edge of the first printed circuit board. 
     An image sensor package according to an embodiment of the disclosure includes: an image sensor configured to generate image data; a rigid flexible printed circuit board (RFPCB) directly connected to the image sensor and disposed on the image sensor; a filter configured to block a specific wavelength band of light and disposed on the RFPCB; and a reinforcement member disposed between the RFPCB and the filter. 
     In some embodiments, the RFPCB may further include a connector electrically connected to the RFPCB and serving to transmit the image data to an external host controller, the RFPCB may include an FPCB, which is exposed to the outside between an area connected to the image sensor and an area connected to the connector, and the reinforcement member may be bonded to the RFPCB in the area excluding the FPCB exposed to the outside. 
     In some embodiments, the reinforcement member may be formed of aluminum. 
     In some embodiments, the thickness of the RFPCB may range from 0.15 mm to 0.25 mm, and the thickness of the reinforcement member may range from 0.05 mm to 0.15 mm. 
     In some embodiments, the image sensor and the RFPCB may be electrically connected through a flip chip process. 
     In some embodiments, an area of the RFPCB, which corresponds to an active area of the image sensor, may be removed. 
     In some embodiments, the image sensor package may further include a protective cap attached to the RFPCB so as to surround the image sensor. 
     A camera device according to an embodiment of the disclosure includes: the image sensor package; and a host controller configured to generate a control signal for controlling the image sensor. 
     The aspects of this disclosure are merely some of exemplary embodiments disclosed here, and various embodiments, in which the technical features of this disclosure are reflected, will be derived and understood based on the detailed description of this disclosure, which will be set forth below, by those skilled in the art. 
     Advantageous Effects 
     In the embodiment, unlike an SMT process, when the respective holders are coupled and electrically connected to each other using the ACF, since no separate wire or solder is used, it is possible to reduce the space occupied by wiring and solder, and thus, to reduce the overall length of the camera module in the first direction. 
     In addition, when using the ACF, since heating only to the melting temperature of an adhesive resin, which is much lower than the melting temperature of a solder, is sufficient, excessive heat is not applied to individual holders, and thus, it is possible to significantly reduce the occurrence of thermal damage to the individual holders. 
     In addition, due to the structure in which the image sensor is accommodated in the hollow region, a separate space in which the image sensor is disposed is unnecessary in the camera module, and thus, it is possible to reduce the overall length of the camera module. Accordingly, the camera module may have a slim structure as a whole. 
     The camera module according to the embodiment may be reduced in size and may realize a high-resolution image. 
     Effects of the device according to the disclosure will be described as follows. 
     With the image sensor package and the camera device including the same according to the embodiment of the present invention, it is possible to reduce the sum of thicknesses of the image sensor package and the lens assembly, and consequently, to increase the margin of design in the vertical direction of the lens assembly. 
     In addition, it is possible to increase the margin of design for other modules, which may be disposed under the image sensor, and at the same time, to reduce the overall thickness of the camera device, which may contribute to miniaturization. 
     In addition, the process required for electrical connection from the image sensor to the PCB substrate requires only one flip chip process, which can simplify the entire process. 
     The effects acquired by this disclosure are not limited to the effects mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art, to which this disclosure belongs, from the following description. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view illustrating a camera module according to an embodiment. 
         FIG.  2    is an exploded perspective view illustrating a lens moving device according to the embodiment. 
         FIG.  3    is a perspective view illustrating a base, a first holder, and a second holder according to the embodiment. 
         FIG.  4    is a schematic side cross-sectional view of a camera module according to the embodiment. 
         FIG.  5    is a schematic plan view of an image sensor according to the embodiment. 
         FIG.  6    is a schematic plan view of a second holder, a connection board, and a reinforcement member according to the embodiment. 
         FIG.  7    is a perspective view illustrating a portable device according to an embodiment. 
         FIG.  8    is a view illustrating the configuration of the portable device illustrated in  FIG.  7   . 
         FIGS.  9   a  and  9   b    are cross-sectional views illustrating a camera module according to a first embodiment. 
         FIG.  10    is a cross-sectional view illustrating a camera module according to a second embodiment. 
         FIG.  11    is a cross-sectional view illustrating a camera module according to a third embodiment. 
         FIG.  12    is an explanatory view of an example of a camera device according to an embodiment of this disclosure. 
         FIG.  13    is a view illustrating one embodiment of an image sensor package illustrated in  FIG.  12   . 
         FIG.  14    is a view illustrating another embodiment of the image sensor package illustrated in  FIG.  12   . 
         FIG.  15    is a top view of the image sensor package illustrated in  FIG.  13    or  FIG.  14   . 
         FIG.  16    is a view illustrating an image sensor package according to a comparative example of this disclosure. 
     
    
    
     BEST MODE 
     A camera module according to an embodiment of the present invention includes: a lens moving device including a base; a printed circuit board (PCB) including an upper surface, an outer side of which is coupled to the base and an inner side of which is coupled to a filter; an image sensor coupled to an inner side of a lower surface of the PCB; and a flexible printed circuit board (FPCB) coupled to an outer side of the lower surface of the PCB and configured to surround the image sensor, wherein the PCB and FPCB may be coupled and electrically connected to each other by a conductive adhesive. 
     MODE FOR INVENTION 
     Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. The embodiments may be modified in various ways and may take various other forms, and specific embodiments will be illustrated in the drawings and described in detail herein. However, this has no intention to limit the embodiments to the specific forms disclosed herein, and it should be understood that all modifications, equivalents, and substitutions may be devised within the spirit and scope of the embodiments. 
     Although terms such as, for example, “first” and “second” may be used to describe various elements, the elements should not be limited by the terms. These terms are merely used to distinguish the same or similar elements from each other. In addition, the terms particularly defined taking into consideration the configurations and functions of the embodiments are merely given to describe the embodiments and should not be intended to limit the scope of the embodiments. 
     In the description of the embodiments, it will be understood that, when an element is referred to as being formed “on” or “under” another element, it can be directly “on” or “under” the other element or be indirectly formed with intervening elements therebetween. It will also be understood that “on” or “under” the element may be described relative to the drawings. 
     In addition, relative terms such as, for example, “on/upper/above” and “beneath/lower/below”, used in the following description may be used to distinguish any one substance or element with another substance or element without requiring or containing any physical or logical relationship or sequence between these substances or elements. 
     In addition, in the drawings, the orthogonal coordinate system (x, y, z) may be used. In the drawings, the x-axis and the y-axis define a plane orthogonal to the optical axis. For convenience, the optical-axis direction (the z-axis direction) may be referred to as a “first direction”, the x-axis direction may be referred to as a “second direction”, and the y-axis direction may be referred to as a “third direction”. 
       FIG.  1    is a perspective view illustrating a camera module according to an embodiment, and  FIG.  2    is an exploded perspective view illustrating a lens moving device  100  according to the embodiment. 
     An optical image stabilizer, which is applied to a small-sized camera module of a portable device, such as a smart phone or a tablet PC, refers to a device that is configured so as to prevent the outline of a photographed image from being indistinctly formed due to vibrations caused by shaking of the user&#39;s hand while photographing a still image. 
     In addition, an auto-focusing device is a device that automatically focuses the image of a subject on an image sensor  500 . The optical image stabilizer and the auto-focusing device may be configured in various ways. In the embodiment, an optical module including a plurality of lenses may be moved in a first direction, or may be moved in a direction perpendicular to the first direction, so as to perform an optical image stabilization operation and/or an auto-focusing operation. 
     As illustrated in  FIG.  1   , the camera module according to the embodiment may include the lens moving device  100 , a first holder  400 , and a second holder  600 . 
     The lens moving device  100  may include a base  210 , which is disposed thereunder and is adhered to the first holder  400 . As described above, the lens moving device  100  may perform an optical image stabilization operation and/or an auto-focusing operation by moving the optical module composed of the plurality of lenses. The specific structure of the lens moving device  100  will be described below with reference to  FIG.  2   . 
     The first holder  400  may be coupled to the base  210 , and a filter  410  may be mounted on the first holder. In addition, the image sensor  500  may be coupled to the underside of the first holder  400 . The image sensor  500  will be described below in detail with reference to  FIG.  4   , for example. The second holder  600  may be disposed below the first holder  400 . Meanwhile, the first holder, the image sensor, and the second holder may be provided as circuit boards. 
     The second holder  600  may include various driving drivers for driving the lens moving device  100  and circuits for receiving current, receiving electric signals from external devices, or transmitting electric signals to the external devices. Of course, in the case of a camera module which does not have an auto-focusing function or an optical image stabilization function and does not require a separate lens moving device, the second holder  600  may not include a driver. 
     In addition, the second holder  600  may be provided with a connection board  610  for electrical connection between the second holder  600  and an external device such as, for example, a power supply, a display device, or a storage device. 
     The first holder  400  and the second holder  600  will be described below in detail with reference to  FIG.  3    and the following drawings. 
     As illustrated in  FIG.  2   , the lens moving device  100  according to the embodiment may include a movable unit and a fixed unit. Here, the movable unit may perform the auto focusing function of a lens. The movable unit may include a bobbin  110  and a first coil  120 . The fixed unit may include a first magnet  130 , a housing  140 , an upper elastic member  150 , and a lower elastic member  160 . 
     The bobbin  110  may be provided so as to move in the first direction inside the housing  140 , may be provided on the outer circumferential surface thereof with the first coil  120 , which is disposed inside the first magnet  130 , and may be provided in the inner space of the housing  140  so as to be reciprocally movable in the first direction by electromagnetic interaction between the first magnet  130  and the first coil  120 . The first coil  120  may be provided on the outer circumferential surface of the bobbin  110  so as to enable electromagnetic interaction with the first magnet  130 . 
     In addition, the bobbin  110  may be elastically supported by the upper and lower elastic members  150  and  160 , and may perform an auto-focusing function by moving in the first direction. 
     The bobbin  110  may include a lens barrel (not illustrated) in which at least one lens is provided. The lens barrel may be coupled inside the bobbin  110  in various ways. 
     For example, the lens barrel may be coupled to the bobbin  110  using an adhesive or the like. In addition, the lens barrel may be coupled to the bobbin  110  through screwing. Alternatively, one or more lenses may be integrally formed with the bobbin  110  without a lens barrel. 
     Only one lens may be coupled to the lens barrel, or two or more lenses may be configured so as to form an optical system. 
     The auto-focusing function may be controlled according to the direction of current, and the auto-focusing function may be realized by moving the bobbin  110  in the first direction. For example, when forward current is applied, the bobbin  110  may move upwards from the initial position thereof, and when reverse current is applied, the bobbin  110  may move downwards from the initial position thereof. Alternatively, the amount of unidirectional current may be adjusted to increase or decrease the distance of movement from the initial position in a given direction. 
     The upper and lower surfaces of the bobbin  110  may be formed with a plurality of upper support protrusions and lower support protrusions. The upper support protrusions may be provided in a cylindrical shape or in a prismatic shape, and may serve to couple and fix the upper elastic member  150 . The lower support protrusions may be provided in a cylindrical shape or in a prismatic shape, and may serve to couple and fix the lower elastic member  160 . 
     Here, the upper elastic member  150  may be formed with through-holes corresponding to the upper support protrusions, and the lower elastic member  160  may be formed with through-holes corresponding to the lower support protrusions. The respective support protrusions and the through-holes may be fixedly coupled to each other using an adhesive member, such as epoxy, or by thermal bonding. 
     The housing  140  may take the form of a hollow column to support the first magnet  130 , and may have a substantially rectangular shape. The first magnet  130  may be coupled to and disposed on the side surface portion of the housing  140 . In addition, as described above, the bobbin  110 , which is guided by the upper and lower elastic members  150  and  160  so as to move in the first direction, may be disposed inside the housing  140 . 
     The upper elastic member  150  may be provided at the upper side of the bobbin  110  and the lower elastic member  160  may be provided at the lower side of the bobbin  110 . The upper elastic member  150  and the lower elastic member  160  may be coupled to the housing  140  and the bobbin  110 , and the upper elastic member  150  and the lower elastic member  160  may elastically support the upward movement and/or the downward movement of the bobbin  110  in the first direction. The upper elastic member  150  and the lower elastic member  160  may be provided as leaf springs. 
     As illustrated in  FIG.  2   , the upper elastic member  150  may be provided as a plurality of parts separated from each other. Through such a multi-split structure, the respective split parts of the upper elastic member  150  may receive current having different polarities or different voltages. In addition, the lower elastic member  160  may have a multi-split structure and may be electrically connected to the upper elastic member  150 . 
     Meanwhile, the upper elastic member  150 , the lower elastic member  160 , the bobbin  110 , and the housing  140  may be assembled through thermal bonding and/or bonding using an adhesive or the like. 
     The base  210  may be disposed below the bobbin  110  and may be provided in a substantially rectangular shape, and a printed circuit board  250  may be disposed or seated on the base. 
     A surface of the base  210 , which faces a portion of the printed circuit board  250  in which a terminal surface  253  is formed, may be formed with a support groove having a size corresponding to the terminal surface. The support groove may be recessed inward to a predetermined depth from the outer circumferential surface of the base  210  so as to prevent the portion, on which the terminal surface  253  is formed, from protruding outwards or to adjust the extent to which the portion protrudes. 
     A support member  220  may be disposed on the side surface of the housing  140  so as to be spaced apart from the housing  140 . The support member may be coupled at the upper end thereof to the upper elastic member  150  and at the lower end thereof to the base  210 , the printed circuit board  250 , or a circuit member  231 . The support member may support the bobbin  110  and the housing  140  so as to be movable in the second direction and/or the third direction perpendicular to the first direction, and may also be electrically connected to the first coil  120 . 
     According to the embodiment, a total of four support members  220  may be symmetrically provided since they are respectively disposed on the outer surfaces of the respective corners of the housing  140 . In addition, the support member  220  may be electrically connected to the upper elastic member  150 . That is, for example, the support member  220  may be electrically connected to a portion of the upper elastic member  150  in which a through-hole is formed. 
     In addition, since the support member  220  is formed separately from the upper elastic member  150 , the support member  220  and the upper elastic member  150  may be electrically connected to each other using a conductive adhesive material, a solder, or the like. Accordingly, the upper elastic member  150  may apply electric current to the first coil  120  through the support member  220 , which is electrically connected thereto. 
     The support member  220  may be connected to the printed circuit board  250  through through-holes formed in the circuit member  231  and the printed circuit board  250 . Alternatively, the support member  220  may be electrically soldered to a corresponding portion of the circuit member  231  without forming through-holes in the circuit member  231  and/or the printed circuit board  250 . 
     Meanwhile, in  FIG.  2   , the linear support member  220  is illustrated as one embodiment, but the disclosure is not limited thereto. That is, the support member  220  may be provided as a plate-shaped member or the like. 
     A second coil  230  may perform optical image stabilization by moving the housing  140  in the second direction and/or in the third direction through electromagnetic interaction with the first magnet  130 . 
     Here, the second and third directions may include directions substantially close to the x-axis direction (or the first direction) and the y-axis direction (or the second direction) as well as the x-axis and y-axis directions. In other words, the housing  140  may move in directions parallel to the x-axis and the y-axis when viewed in terms of driving in the embodiment, but may also move in directions slightly oblique to the x-axis and the y-axis when moving while being supported by the support member  220 . 
     Therefore, the first magnet  130  may need to be provided at a position corresponding to the second coil  230 . 
     The second coil  230  may be disposed so as to be opposite the first magnet  130  fixed to the housing  140 . In an embodiment, the second coil  230  may be disposed outside the first magnet  130 . Alternatively, the second coil  230  may be spaced apart downwards from the first magnet  130  by a predetermined distance. 
     According to the embodiment, a total of four second coils  230  may be provided on four side portions of the circuit member  231 , but the disclosure is not limited thereto. Only two second coils including, for example, one second coil on a second side in the second direction and one second coil on a third side in the third direction may be provided, or more than four second coils may be provided. 
     Alternatively, a total of six second coils may be provided such that one second coil is provided on a first side in the second direction, two second coils are provided on the second side in the second direction, one second coil is provided on the third side in the third direction, and two second coils are provided on a fourth side in the third direction. Alternatively, in this case, the first side and the fourth side may be next to each other, and the second side and the third side may be next to each other. 
     In the embodiment, a circuit pattern may be formed on the circuit member  231  to have the shape of the second coil  230 , or a separate second coil may be disposed on the top of the circuit member  231 , but the disclosure is not limited thereto. A circuit pattern may be formed directly on the top of the circuit member  231  to have the shape of the second coil  230 . 
     Alternatively, the second coil  230  may be configured by winding a wire in a doughnut shape, or the second coil  230  may be formed to have an FP coil shape and be electrically connected to the printed circuit board  250 . 
     The circuit member  231  including the second coil  230  may be provided or disposed on the upper surface of the printed circuit board  250 , which is disposed at the upper side of the base  210 . However, the disclosure is not limited thereto. The second coil  230  may be disposed in close contact with the base  210 , may be spaced apart from the base  210  by a predetermined distance, or may be formed on a separate board so that the board is stacked on and connected to the printed circuit board  250 . 
     The printed circuit board  250  may be electrically connected to at least one of the upper elastic member  150  or the lower elastic member  160  and may be coupled to the upper surface of the base  210 . As illustrated in  FIG.  2   , the printed circuit board may be formed with a through-hole, into which the support member  220  is inserted, at a position that corresponds to an end of the support member  220 . Alternatively, the printed circuit board may be electrically connected and/or bonded to the support member without forming a through-hole. 
     A terminal  251  may be disposed or formed on the printed circuit board  250 . In addition, the terminal  251  may be disposed on the bent terminal surface  253 . A plurality of terminals  251  may be disposed on the terminal surface  253 , and may supply current to the first coil  120  and/or the second coil  230  when receiving an external voltage. The number of terminals formed on the terminal surface  253  may be increased or decreased based on the type of constituent elements that need to be controlled. In addition, the printed circuit board  250  may include one terminal surface  253  or two or more terminal surfaces. 
     A cover member  300  may be provided in a substantially box shape, may accommodate, for example, the movable unit, the second coil  230 , and a portion of the printed circuit board  250  therein, and may be coupled to the base  210 . The cover member  300  may protect, for example, the movable unit, the second coil  230 , and the printed circuit board  250 , which are accommodated therein, so as to prevent damage thereto. In addition, the cover member may limit outward leakage of an electromagnetic field, which is created by, for example, the first magnet  130 , the first coil  120 , and the second coil  230  therein, thereby enabling the electromagnetic field to be focused. 
     The embodiment of the camera module having the auto-focusing function and the optical image stabilization function has been described above. 
     On the other hand, according to another embodiment, the camera module may include a lens moving device, which has an auto-focusing function but does not have an optical image stabilization function. In this case, for example, the lens moving device may be obtained by removing the support member  220 , the second coil  230 , and the circuit member including the second coil  230  from the lens moving device illustrated in  FIG.  2   . 
     According to still another embodiment of the present invention, the camera module may be provided in a structure having no auto-focusing and optical image stabilization functions. In this case, for example, the camera module may include the lens barrel, the bobbin  110 , which accommodates the lens barrel therein, and the cover member  300 , which accommodates the bobbin therein. 
       FIG.  3    is a perspective view illustrating the base  210 , the first holder  400 , and the second holder  600  according to an embodiment. 
     The filter  410  may be mounted in the first holder  400 . The filter  410  may be mounted in the first holder  400  at a position at which it faces the lens barrel and the image sensor  500  in the first direction. The filter  410  may filter light within a specific wavelength range of incident light directed through the lens barrel, and the light, which has passed through the filter  410 , may be incident on a sensing unit  510  provided in the image sensor  500 . 
     The first holder  400  may be a printed circuit board (PCB) for transmitting a voltage, a control signal, an image signal, or the like, but the scope of the disclosure is not limited thereto. Here, the filter  410  may be, for example, an infrared filter that prevents infrared light from being incident on the image sensor  500 . In another embodiment, the filter  410  may be a blue filter. The blue filter may be formed on the surface thereof with a coating layer for blocking ultraviolet light, and may advantageously effectively prevent ghost and flare phenomena, which occur in an image formed on the sensing unit  510 , unlike a general infrared filter. 
     The second holder  600  may be formed of a flexible material or a hard material. However, in order to allow the connection board  610 , which is electrically connected to the second holder  600 , to be easily connected to external devices and the camera module, the second holder may be formed of a flexible material that is easily changed in position. 
     The second holder  600  may be a flexible printed circuit board (FPCB), which transmits a voltage, a control signal, an image signal or the like and is easily deformed according to design specifications, but the scope of the disclosure is not limited thereto. 
       FIG.  4    is a schematic side cross-sectional view of a camera module according to the embodiment.  FIG.  5    is a schematic plan view of the image sensor  500  according to the embodiment.  FIG.  6    is a schematic plan view of the second holder  600 , the connection board  610 , and a reinforcement member  650  according to the embodiment. 
     As illustrated in  FIG.  4   , the camera module may further include the image sensor  500 . The image sensor  500  may be coupled to the underside of the first holder  400 , and the sensing unit  510  may be mounted on the image sensor. Here, the sensing unit  510  of the image sensor  500  may be disposed in the first direction so as to be opposite the filter  410 . The sensing unit  510  is a region on which light, which has passed through the filter  410 , is incident to form an image. 
     As illustrated in  FIG.  4   , the filter  410  may be coupled to the inner side of the upper surface of the first holder  400 , and the base  210  may be coupled to the outer side of the upper surface of the first holder. The image sensor  500  may be coupled to the inner side of the lower surface of the first holder  400 , and the second holder  600  may be coupled to the outer side of the lower surface of the first holder  400 . Here, the inner side and the outer side may be defined on the basis of the center of the incident surface of the light, which has passed through the filter  410 . The filter  410  may be attached and coupled to the upper surface of the first holder  400  by an adhesive such as epoxy, for example. 
     The light, which has passed through the filter  410 , may be incident on the sensing unit  510 . Thus, as illustrated in  FIG.  4   , a through-hole may be formed in the first holder  400  so that light may pass therethrough in a region in which the filter  410  and the sensing unit  510  are opposite each other. 
     Meanwhile, the first holder  400  and the image sensor  500  may be coupled and electrically connected to each other. As illustrated in  FIG.  4   , the first holder  400  and the image sensor  500  may be coupled and electrically connected to each other by a second coupling portion T 2 . 
     The coupling and electrical connection between the first holder  400  and the image sensor  500  may be realized through, for example, a flip chip process. That is, the second coupling portion T 2  may be formed through a flip chip process. 
     The flip chip process may be performed by, for example, spraying a conductive material onto the first holder  400  and/or the image sensor  500  to attach the first holder  400  and the image sensor  500  to each other. The first holder  400  and the image sensor  500  may be coupled and electrically connected to each other via fusion of the conductive material. 
     The flip chip process has a simpler structure, and more particularly, a thinner coupling region than a surface mount technology (SMT) process, which is commonly used for the coupling and electrical connection of a board. Therefore, the flip chip process may reduce the overall length of the camera module in the first direction. 
     Meanwhile, in another embodiment, the coupling and electrical connection between the first holder  400  and the image sensor  500  may be realized using a conductive adhesive. That is, in  FIG.  4   , the second coupling portion T 2 , which couples and electrically interconnects the first holder  400  and the second holder  600 , may be formed of a conductive adhesive. 
     The conductive adhesive may be, for example, an anisotropic conductive film (ACF). Such a conductive adhesive will be described in detail with relation to the coupling structure of the first holder  400  and the second holder  600 . 
     The first holder  400  and the second holder  600  may be coupled and electrically connected to each other using a conductive adhesive. That is, in  FIG.  4   , a first coupling portion T 1 , which couples and electrically interconnects the first holder  400  and the second holder  600 , may be formed of a conductive adhesive. 
     The conductive adhesive may be, for example, an anisotropic conductive film (ACF). The ACF is entirely in the form of a film, and may be made by mixing conductive particles, for example, gold (Au) or nickel (Ni) particles with an adhesive resin. 
     The first holder  400  and the second holder  600  are coupled to each other by disposing the ACF on a coupling portion of the first holder  400  and the second holder  600  and pressing and heating the ACF, and may be electrically connected to each other by the conductive particles. 
     When the first holder  400  and the second holder  600  are coupled and electrically connected to each other by the SMT process, a wire and a solder may be used. Therefore, in the case of the SMT process, the space occupied by the wire and the solder is required, so that the overall length of the camera module in the first direction may be increased. 
     In addition, in the SMT process, the process of melting and curing the solder may be repeated, and to this end, excessive heat may be applied to the respective holders. Therefore, thermal damage to the holders, which are provided in a board shape, may occur. 
     However, since the ACF does not use separate wire or solder, the space occupied by the wire and the solder may be eliminated, and thus the overall length of the camera module in the first direction may be reduced. 
     In addition, in the case of using the ACF, since heating only to the melting temperature of the adhesive resin, which is much lower than the melting temperature of the solder, is sufficient, excessive heat is not applied to individual holders, and thus, it is possible to significantly reduce the occurrence of thermal damage to the individual holders. 
     In an embodiment, the camera module may further include the reinforcement member  650 . The reinforcement member  650  may be disposed below the second holder  600  and may be coupled to the lower surface of the second holder  600 , for example. As illustrated in  FIG.  6   , the reinforcement member  650  may be provided in a plate shape, for example, and may be formed of a material including stainless steel, for example. 
     The second holder  600  may be formed with a hollow region VC for accommodating therein the image sensor  500 , and foreign substances may be introduced into the camera module due to the hollow region VC. 
     Therefore, the reinforcement member  650  may function to close the hollow region VC so as to prevent foreign substances from being introduced into the camera module. The reinforcement member  650  may be adhered to the lower surface of the second holder  600  using an adhesive such as, for example, epoxy in order to effectively seal the hollow region VC. 
     As illustrated in  FIG.  5   , the image sensor  500  may include a printed terminal unit  550 . The conductive adhesive may be adhered to the printed terminal unit  550  so that the printed terminal unit  550  may be coupled and electrically connected to the first holder  400 . 
     That is, the second coupling portion T 2  may be coupled to the printed terminal unit  550 . Here, the sensing unit  510  may be electrically connected to the first holder  400  via the printed terminal unit  550 . 
     Meanwhile, the second holder  600  may be coupled to the first holder  400  and may surround the image sensor  500 . As illustrated in  FIG.  4   , the second holder  600  may be formed with the hollow region VC, and the image sensor  500  may be accommodated in the hollow region VC. 
     Since the image sensor  500  is accommodated in the hollow region VC, the camera module does not require a separate space in which the image sensor  500  is disposed, and thus, the overall length of the camera module in the first direction may be reduced. Accordingly, the camera module may have a slim overall structure. 
       FIG.  7    is a perspective view illustrating a portable device according to an embodiment.  FIG.  8    is a view illustrating the configuration of the portable device illustrated in  FIG.  7   . 
     Referring to  FIGS.  7  and  8   , the portable device  200 A (hereinafter referred to as a “device”) may include a body  850 , a wireless communication unit  710 , an A/V input unit  720 , a sensing unit  740 , an input/output unit  750 , a memory  760 , an interface unit  770 , a controller  780 , and a power supply unit  790 . 
     The body  850  illustrated in  FIG.  7    has a bar shape, but is not limited thereto. The body may have any of various structures such as a slide type, a folder type, a swing type, or a swivel type, in which two or more sub-bodies are coupled so as to be movable relative to each other. 
     The body  850  may include a case (e.g., a casing, a housing, or a cover) forming the external appearance thereof. For example, the body  850  may be divided into a front case  851  and a rear case  852 . Various electronic components of the device may be mounted in the space formed between the front case  851  and the rear case  852 . 
     The wireless communication unit  710  may include one or more modules, which enable wireless communication between the device  200 A and a wireless communication system or between the device  200 A and the network in which the device  200 A is located. For example, the wireless communication unit  710  may include a broadcast receiving module  711 , a mobile communication module  712 , a wireless Internet module  713 , a near field communication module  714 , and a location information module  715 . 
     The audio/video (A/V) input unit  720  serves to input an audio signal or a video signal, and may include a camera  721  and a microphone  722 . 
     The camera  721  may be the camera including the lens moving device  100  according to the embodiment illustrated in  FIG.  2   . 
     The sensing unit  740  may sense the current state of the device  200 A, such as the opening/closing state of the device  200 A, the position of the device  200 A, the presence or absence of a user touch, the orientation of the device  200 A, and the acceleration/deceleration of the device  200 A, and may generate a sensing signal for controlling the operation of the device  200 A. For example, when the device  200 A is in the form of a slide phone, the sensing unit may sense whether the slide phone is opened or closed. In addition, the sensing unit functions to sense whether or not the power supply unit  790  supplies a voltage, or whether or not the interface unit  770  is connected to an external device. 
     The input/output unit  750  serves to generate input or output related to a visual sense, auditory sense, tactile sense, or the like. The input/output unit  750  may generate input data for controlling the operation of the device  200 A, and may also display information processed in the device  200 A. 
     The input/output unit  750  may include a keypad unit  730 , a display module  751 , a sound output module  752 , and a touchscreen panel  753 . The keypad unit  730  may generate input data in response to input made on a keypad. 
     The display module  751  may include a plurality of pixels, the color of which is varied in response to an electric signal. For example, the display module  751  may include at least one selected from among a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, and a three-dimensional display (3D display). 
     The sound output module  752  may output audio data received from the wireless communication unit  710  in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, a broadcast reception mode, or the like, or may output audio data stored in the memory  760 . 
     The touchscreen panel  753  may convert a change in capacitance caused by a user&#39;s touch on a specific area of a touchscreen into an electric input signal. 
     The memory  760  may store a program for processing and controlling the controller  780 , and may temporarily store input/output data (e.g., a telephone directory, messages, audio, still images, photographs, and moving images). For example, the memory  760  may store an image photographed by the camera  721 , for example, a photograph or a moving image. 
     The interface unit  770  serves as a connection path for an external device connected to the device  200 A. The interface unit  770  receives data from the external device, or receives a voltage and transmits the voltage to each component in the device  200 A, or allows data in the device  200 A to be transmitted to the external device. For example, the interface unit  770  may include a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port for connecting a device equipped with an identification module, an audio input/output (I/O) port, a video input/output (I/P) port, an earphone port, and the like. 
     The controller  780  may control the overall operation of the device  200 A. For example, the controller  780  may perform related control and processing for voice call, data communication, video call, and the like. The controller  780  may include a panel controller  144  of the touchscreen panel drive unit illustrated in  FIG.  1    or may perform the function of the panel controller  144 . 
     The controller  780  may include a multimedia module  781  for multimedia playback. The multimedia module  781  may be provided in the controller  180 , or may be provided separately from the controller  780 . 
     The controller  780  perform a pattern recognition process for recognizing handwriting input or drawing input performed on the touchscreen as characters and images, respectively. 
     The power supply unit  790  may supply external power or internal power according to the control of the controller  780 , and may supply the voltage required for the operation of the respective components. 
       FIGS.  9   a  and  9   b    are cross-sectional views illustrating a camera module according to a first embodiment,  FIG.  10    is a cross-sectional view illustrating a camera module according to a second embodiment, and  FIG.  11    is a cross-sectional view illustrating a camera module according to a third embodiment. 
     Referring to  FIGS.  9   a    to  11 , the camera module  1100 A,  1100 B or  1100 C according to the present embodiment may include a first printed circuit board  1110 , first adhesive members  1120 , a second printed circuit board  1130 , an image sensor  1140 , a filter  1150 , and a housing  1160 . 
     The first printed circuit board  1110  may be a rigid-flex printed circuit board (R-FPCB), a PCB, a ceramic board, or the like. 
     The first adhesive members  1120  may be disposed on the first printed circuit board  1110 , and the first adhesive members  1120  may be spaced apart from each other by a predetermined distance. Here, the spaced distance may be greater than the width of the image sensor  1140  in order to secure the space in which the image sensor  1140 , which will be described below, may be disposed. 
     The second printed circuit board  1130  may be disposed on the first adhesive members  1120 , and the second printed circuit board  1130  may be disposed so that the lower edge of the second printed circuit board  1130  may be adhered to the first adhesive members  1120 . 
     The image sensor  1140  may be coupled to the lower portion of the second printed circuit board  1130  so as to be disposed between the first adhesive members  1120 . 
     The image sensor  1140  serves to collect the incident light and generate an image signal. A semiconductor device used in the image sensor  1140  may be a Charged Coupled Device (CCD) or a CMOS image sensor, and may be a semiconductor device that captures an image of a person or an object using a photoelectric conversion element and a charge coupled device and outputs an electric signal. 
     The image sensor  1140  may be mounted on the first printed circuit board  1110  through a CSP process, as illustrated in  FIGS.  9   a    to  11 . 
     The CSP process refers to a package that includes an area not greater than 1.2 times that of a die or that has a solder ball pitch of 0.8 mm. The image sensor  1140  may take the form of a package, and may have a modular structure along with a filter  1150 , a metal wiring pattern (not illustrated) formed on the filter  1150 , and a passivation layer (not illustrated) for protecting the wiring pattern (not illustrated). 
     The image sensor  1140  may be coupled to the lower portion of the second printed circuit board  1130 . The image sensor  1140  may be spaced apart upwards from the first printed circuit board  1110 , and a space may be formed between the image sensor  1140  and the first printed circuit board  1110 . 
     The filter  1150  may be disposed on the top of the second printed circuit board  1130 . 
     The filter  1150  may be made of a glass material, and may be provided as a glass substrate. 
     In a conventional camera module, a housing is disposed on the edge of a first printed circuit board so as to surround a passive element disposed on the edge of the first printed circuit board. When the housing is disposed on the first printed circuit board, a reduction in the size of the camera module is limited. 
     In the present embodiment, the housing  1160  may be disposed on the upper edge of the second printed circuit board  1130 . 
     Here, the center line C of the lower end surface of the housing  1160  may be disposed in an area in which the center line coincides with the center line C′ of the first adhesive member  1120  in the vertical direction. 
     Since the housing  1160 , to which a lens holder  1180  is fastened, is disposed on the second printed circuit board  1130  on which the image sensor  1140  is mounted, it is possible to prevent optical tilt, thereby realizing a high-resolution image. 
     The first adhesive member  1120  may include solder balls. When the height of the solder balls is too low, the space in which the image sensor  1140  is to be disposed may be too narrow. Conversely, when the height of the solder balls is too high, the overall height of the camera module  1100 A,  1100 B or  1100 C may be increased when the housing  1160  is disposed on the second printed circuit board  1130 , which is adhered on the solder balls. 
     Therefore, the height of the first adhesive members  1120  may be determined such that the minimum height of the camera module is maintained while securing the space in which the image sensor  1140  may be disposed. 
     A second adhesive member  1170  may be disposed between the upper surface of the second printed circuit board  1130  and the lower surface of the housing  1160 . The second adhesive member  1170  may include at least one of thermosetting epoxy or UV curing epoxy. 
     Referring to  FIG.  10   , the second printed circuit board  1130  may be formed with a groove  1132 , into which the lower end of the housing  1160  is inserted. 
     The second adhesive member  1170  may be disposed on the inner side surface and the bottom surface of the groove  1132  to adhere and fix the lower end of the housing  1160  to the groove  1132 . 
     Since the lower end of the housing  1160  is inserted into and coupled to the groove  1132 , the height of the housing  1160  may be reduced by the depth to which the lower end of the housing  1160  is inserted into the groove  1132 . 
     As illustrated in  FIG.  11   , a protrusion  1134  may be formed on the exterior of the upper portion of the second printed circuit board  1130  so as to abut the outer lower end of the housing  1160 . 
     The height of the protrusion  1134  may be greater than the thickness of the second adhesive member  1170  in order to prevent the second adhesive member  1170  from leaking out of the second printed circuit board  1130 . 
     As illustrated in  FIGS.  9   a    to  11 , the image sensor  1140  may be flip-chip bonded to the second printed circuit board  1130 . 
     When the image sensor  1140  is mounted on the second printed circuit board  1130  through the flip chip process, the second printed circuit board  1130  may be a multilayered ceramic board. 
     The flip chip process is a process in which an electrode pattern or an inner lead is formed with a protrusion using an energizing member such as a solder ball so as to realize electric connection when a chip such as the image sensor  1140  is mounted on the second printed circuit board  1130 . 
     Accordingly, it is possible to reduce the connection space compared with conventional wire bonding. In particular, flip chip bumping is also generally referred to as under bump metallurgy (UBM). Since it is difficult to directly form a solder or an Au bump on an AL or Cu electrode of a semiconductor chip, in order to ensure easy adhesion and to prevent diffusion to the chip, a multilayered metal layer formed between the electrode and the bump may be composed of three layers including a bonding layer, a diffusion preventing layer, and a wettable layer. The flip chip connection process is known technology, and thus, an additional description thereof is omitted. 
     As illustrated in  FIG.  9   a   , an infrared-blocking layer  1125  may be disposed on the surface of the filter  1150 . However, the disclosure is not limited thereto, and the infrared-blocking layer may be disposed on the bottom surface of the filter  1150 , as illustrated in  FIG.  9   b   , or may be formed in the middle of the filter  1150 . In addition, the infrared-blocking layer  1125  may be attached to the filter  1150  to have the form of a film or may be formed through coating. In addition, the infrared-blocking layer may also be an antiglare (AR) coating. 
     The infrared-blocking layer  1125  may optimize the range of light that the image sensor  1140  may sense. That is, when the image sensor  1140  senses near-infrared light (˜1150 nm), other than visible light (400-700 nm), which is visible to the human eye, the image sensor  1140  may fail to capture only an image corresponding to the visible light and the voltage level of a pixel signal, which is the base of the image, may be saturated. Accordingly, the infrared-blocking layer  1125  may filter incoming optical signals and provide the filtered optical signals to the image sensor  1140 . 
     The infrared-blocking layer  1125  may be manufactured by various methods. For example, the infrared-blocking layer  1125  may be manufactured through vacuum thin film deposition. Manufacture may be performed, for example, by alternately depositing (e.g., 30 to 40 layers of) two materials having different indices of refraction (e.g., TiO2/SiO2 or Nb2O5/SiO2) on a glass substrate. Thus, the infrared-blocking layer  1125  manufactured by this method may transmit visible light and reflect near-infrared light. That is, the infrared-blocking layer  1125 , which reflects the incoming infrared light, may be formed by stacking a plurality of layers. The infrared-blocking layer  1125  may be designed such that adjacent layers among these layers have different indices of refraction so as to extinguish the infrared light reflected from the respective layers via destructive interference. For example, there are infrared-blocking materials including high refractive index materials such as TiO2, ZrO2, Ta2O6 and Nb2O5, and low refractive index materials such as iO2 and MgF2, and an infrared-blocking layer may be generated by stacking these materials in multiple layers. 
     The infrared-blocking layer  1125  may block near-infrared light by absorbing the near-infrared light. In the case of the infrared-blocking layer  1125 , the light introduced from the lateral side may be efficiently filtered. Examples of an infrared-absorbing material may include blue glass in which a pigment such as copper ions is dispersed. Alternatively, the infrared-blocking layer  1125  may be formed by combining a reflector that reflects infrared light and an absorber that absorbs infrared light. 
     When the infrared-blocking layer  1125  is disposed on the filter  1150 , the filter  1150  may serve as an infrared-blocking filter even if a separate infrared-blocking filter is provided in the camera module. When the infrared-blocking layer  1125  is formed on the filter  1150 , the camera module may be decreased in size since it is not necessary to provide a separate infrared-blocking filter. 
     The camera module  1100 A,  1100 B or  1100 C according to the embodiment may further include a lens holder  1180  coupled inside the housing  1160 . Then, at least one lens  1182  may be disposed in the lens holder  1180 . 
     The lens holder  1180  may be screwed to the housing  1160 . However, the disclosure is not limited thereto, and the housing  1160  may be integrally formed with the lens holder  1180 . 
     A thread  1181  may be formed on the outer circumferential surface of the lens holder  1180 , and at least one lens  1182  may be disposed inside the lens holder. Then, the thread  1181  is screwed into a female thread  1161  formed in the inner circumferential surface of the housing  1160  so that the focus between the lens  1182  and the image sensor  1140  may be adjusted. A camera module having an optical system formed in this manner is called a focusing-type camera module. 
     Meanwhile, although not illustrated, the housing  1160  may be integrally formed with the lens holder  1180 . That is, when injection molding the housing  1160 , the lens holder  1180  may be insert-injected therein, and a plurality of lenses  1182  may be directly fastened inside the lens holder  1180 . A camera module having an optical system formed in this manner is called a focusing-free-type camera module. 
     The camera module according to the embodiment may further include a passive element  1190  disposed on the first printed circuit board  1110 . 
     The passive element  1190  may be disposed on the edge of the first printed circuit board  1110  and may serve as a noise remover or a controller for image data processing of the image sensor  1140 . 
     In addition, the passive element  1190  may be formed on the first printed circuit board  1110  via surface mount technology (SMT). 
     As described above, in the camera module according to the embodiment, since the housing, which has conventionally been disposed on the outermost portion of the first printed circuit board, is disposed on the second printed circuit board inside the first printed circuit board, it is possible to minimize the size of the camera module. In addition, since the housing, to which the lens holder is fastened, is disposed on the second printed circuit board on which the image sensor is mounted, it is possible to prevent optical tilt, thereby realizing a high-resolution image. 
     The first printed circuit board  1110 , the second printed circuit board  1130 , the first adhesive members  1120 , the filter  1150 , and the housing  1160  described in  FIGS.  9   a    to  11  may respectively correspond to the second holder  600 , the first holder  400 , the conductive adhesive, the filter  410 , and the base  210  described with reference to  FIGS.  1  to  8   . 
       FIG.  12    is an explanatory view of an example of a camera device  2010  according to an embodiment of this disclosure. 
     Referring to  FIG.  12   , the camera device  2010  may be implemented as a device including a camera module or a device having a camera function, such as a mobile phone, a smart phone, a tablet PC, or a notebook computer including a camera module. The camera module may include an image sensor package. The camera device  2010  may include a lens assembly  2050 , an image sensor package  2100 , and a host controller  2150 . The camera module may be the image sensor package  2100  itself, or may include the lens assembly  2050  and the image sensor package  2100 . 
     The lens assembly  2050  may receive optical signals introduced from outside the camera device  2010  and transmit the optical signals to the image sensor package  2100 . The lens assembly  2050  refracts the optical signals with a field of view and a focal distance depending on the specifications required for the camera device  2010  and transmits the refracted optical signals to the image sensor package  2100 . 
     The lens assembly  2050  may include at least one lens, or may form an optical system by aligning two or more lenses about the central axis thereof. In addition, the lens assembly  2050  may adjust the focal distance under the control of the host controller  2150  in order to provide the focal distance required by the host controller  2150 . 
     To this end, the lens assembly  2050  may adjust the focal distance by varying the position of at least one lens using a voice coil motor (VCM). Alternatively, the lens assembly  2050  may include a liquid lens composed of a conductive liquid and a non-conductive liquid, which are not mixed with each other and form an interface, and may adjust the focal distance by controlling the interface between the conductive liquid and the non-conductive liquid using a driving voltage. 
     The image sensor package  2100  may include an image sensor. The image sensor converts an optical signal, which has passed through the lens assembly  2050 , into an electric signal using each of a plurality of pixels and then generates a digital signal corresponding to the optical signal via analog-digital conversion of the converted electric signal. The plurality of pixels may be arranged in a matrix, and each of the plurality of pixels may include a photoelectric conversion element (e.g., a photodiode) and at least one transistor for sequentially outputting the voltage level of the photoelectric conversion element. The image sensor may output the digital signal corresponding to the optical signal in units of frames or pixels. In some embodiments, the image sensor may include an image signal processor (ISP) for processing and outputting the digital signal. 
     In addition to the image sensor, the image sensor package  2100  may include a component for protecting the image sensor, a component for electrical connection with the host controller  2150 , and a component for coupling the image sensor to the lens assembly  2050 . A more detailed configuration will be described with reference to  FIG.  13   . 
     The host controller  2150  may receive the digital signal (i.e., image data) corresponding to the optical signal from the image sensor package  2100  and may generate a control signal for controlling the operation of the image sensor. In some embodiments, the host controller  2150  may generate a control signal for controlling the VCM or a liquid lens of the lens assembly  2050 . 
     The host controller  2150  may be implemented as a central processing unit (CPU), an application processor (AP), or the like, but the scope of the disclosure is not limited thereto. 
       FIG.  13    is a view illustrating one embodiment of an image sensor package illustrated in  FIG.  12   . 
     Referring to  FIG.  13   , the image sensor package  2200  includes a rigid flexible printed circuit board (RFPCB)  2020 , a flexible printed circuit board (FPCB)  2021  included in the RFPCB  2020 , a circuit element  2022 , a reinforcement member  2023 , an image sensor  2024 , a glass  2025 , a connector  2026 , and outer walls  2027 . 
     The RFPCB  2020  may be a PCB in which a rigid PCB overlaps and is joined to a section of the FPCB  2021  which is a flexible PCB. The RFPCB  2020  may be implemented so as to be very thin, and the rigid PCB and the flexible PCB may be electrically connected to each other. 
     As illustrated in  FIG.  13   , a section of the RFPCB  2021  (a section located between the right outer wall  2027  and the connector  2026 ) may be exposed to the outside, and the exposed section may be bent and mounted as needed as needed when mounted on the camera device  2010 . 
     The RFPCB  2020  may be electrically connected to the image sensor  2024 , and may also be connected to the connector  2026  so as to be electrically connected to an external control circuit (e.g., the host controller  2150  in  FIG.  12   ). 
     A portion of the RFPCB  2020  (a section corresponding to the central portion of the image sensor  2024 ) may be removed through a punching process or a routing process. A portion of the RFPCB  2020  may be removed in order to allow optical signals to pass through the lens assembly  2050  and the glass  2025  without loss to thereby reach the image sensor  2024 . 
     In some embodiments, the RFPCB  2020  may include s circuit (e.g., an ISP) for processing image data output from the image sensor  2024 . 
     The circuit element  2022  may be a passive element (e.g., a capacitor or a resistor) or an active element (e.g., an OPAMP) for constituting a circuit when the RFPCB  2020  includes a separate circuit. The element may be shaped so as to protrude from the PCB. 
     The reinforcement member  2023  serves to reinforce the strength of the RFPCB  2020  in order to prevent deformation thereof. The reinforcement member may be disposed on the top of the RFPCB  2020  except for a position corresponding to the circuit element  2022 . The reinforcement member  2023  may be formed of aluminum having high thermal conductivity and high strength, and the exterior of the aluminum may be coated with a black coating material having high light absorptance in order to lower the reflectance of optical signals. The reinforcement member  2023  may be bonded to the RFPCB  2020  through a bonding process, but the scope of the disclosure is not limited thereto. 
     The image sensor  2024  may refer to the image sensor described in  FIG.  12   . The image sensor  2024  may be electrically connected to the RFPCB  2020  through a flip chip process in a first area AREA 1 . Although only one left area is designated as the first area AREA 1  in  FIG.  13   , the area on the opposite right side about the image sensor  2024  also corresponds to the first area AREA 1 . 
     The flip chip process refers to a process of forming a bump on a chip without wire bonding and then bringing the bump into contact with a mounting board so as to connect the chip to a circuit of the mounting board. Here, the chip may be the image sensor  2024 , and the mounting board may be the RFPCB  2020 . 
     The glass  2025  may be formed of a glass having high transparency and may have a predetermined curvature in order to guide optical signals to an area in which an active area of the image sensor  2024 , that is, pixels, is located. An infrared-ray (IR) film may be attached to the top of the glass  2025  to block infrared rays. In addition, the glass  2025  may be a filter that restricts or passes a certain wavelength of external light. For example, the glass  2025  may be an IR-cut filter. The glass  2025  may be bonded to the reinforcement member  2023  through a bonding process. The glass  2025  may be directly bonded to the RFPCB  2020  in some cases, but the RFPCB  2020  may be relatively more elastic than the reinforcement member  2023 , and therefore may be deteriorated in adhesive force with the glass  2025  when bending, twisting or the like thereof occurs. The reinforcement member  2023  may be disposed on the RFPCB  2020  and the glass may be disposed on the reinforcement member  2023  in order to compensate for deterioration in the adhesive force, for example. 
     The connector  2026  may include at least one terminal, which electrically connects RFPCB  2020  to an external control circuit (e.g., the host controller  2150  in  FIG.  12   ). 
     The outer walls  2027  may serve to protect the circuit element  2022 , the glass  2025 , and the like from other external modules, and may be bonded to the reinforcement member  2023  through a bonding process. The outer walls  2027  may be attached to and fixed to the lens assembly  2050 . 
     The RFPCB  2020  may have a first thickness T 1  (within a range from about 0.15 mm to about 0.25 mm) and a combination of the RFPCB  2020  and the reinforcement member  2023  may have a second thickness T 2  (within a range from about 0.2 mm to about 0.4 mm) 
     In the image sensor package  2200  according to the embodiment of the present invention, since the sum of the thicknesses of the RFPCB  2020  and the reinforcement member  2023  above the image sensor  2024  (in the direction in which optical signals are introduced) is merely the second thickness, the sum of the thicknesses of the image sensor package  2200  and the lens assembly  2050  may be reduced, which may increase the margin of design in the vertical direction of the lens assembly  2050 . Due to the increase in the margin of design, the lens assembly  2050  may increase the number of lenses and the distance to which the lenses may be moved by the VCM, which may enhance the performance of the camera device. 
     In addition, it is possible to increase the margin of design for any other module which may be disposed below the image sensor  2025  (in the direction opposite the direction in which the optical signals are introduced) and to reduce the thickness of the entire camera device  2010 , which may contribute to the miniaturization of the camera device  2010 . 
     In addition, a process required for electrical connection from the image sensor  2024  to the RFPCB  2021  requires only one flip chip process, which may simplify the entire process. 
     According to another embodiment, the reinforcement member  2023  may not be included in the structure of the image sensor package  2200  in  FIG.  13   , in which case the overall thickness of the image sensor package  2200  may be further reduced. 
     In  FIG.  13   , the image sensor  2024  has a form of being exposed downwards. When other components in the camera device  2010  are disposed below the image sensor package  2200 , a protective cap (not illustrated) may be attached so as to surround the image sensor  2024  in order to prevent impacts from being applied to the image sensor  2024 . 
     The protective cap (not illustrated) may have a greater area and height than the image sensor  2024  and may be shaped so as to have one open surface. The protective cap may be attached to the RFPCB  2020  through a bonding process so as to surround the image sensor  2024 . The protective cap (not illustrated) may be realized as a plastic workpiece having high thermal conductivity and high strength, but the scope of the disclosure is not limited thereto. 
       FIG.  14    is a view illustrating another embodiment of the image sensor package illustrated in  FIG.  12   . 
     Referring to  FIG.  14   , an image sensor package  2300  may include the FPCB  2021 , the circuit element  2022 , the reinforcement member  2023 , the image sensor  2024 , the glass  2025 , the connector  2026 , and the outer walls  2027 . 
     That is, the image sensor package  2300  may have a structure in which only the FPCB  2021 , but not the RFPCB  2020 , is included, unlike the image sensor package  2200  of  FIG.  13   . 
     Thus, a flip chip process of connecting the image sensor  2024  to the FPCB  2021  may be performed on the FPCB  2021  in a second area AREA 2 . However, since the flip chip process may require a certain level of strength or more, the flip chip process may be performed after the FPCB  2021  and the reinforcement member  2023  are attached to each other. 
     As a result, the FPCB  2021  may have a third thickness T 3  (of about 0.05 mm), and a combination of the FPCB  2021  and the reinforcement member  2023  may have a fourth thickness T 4  (within a range from about 0.1 to about 0.2 mm). Thereby, the overall thickness of the image sensor package  2300  may be further reduced. 
     Here, in order to increase the strength of the FPCB  2021 , the reinforcement member illustrated in  FIG.  14    may be thicker than the reinforcement member illustrated in  FIG.  13   . 
     For convenience of description, the description related to  FIG.  14    is focused on differences from  FIG.  13   , and the image sensor package  2300  may have substantially the same structure, material, and function as the image sensor package  2200  except for these differences. 
       FIG.  15    is a top view of the image sensor package illustrated in  FIG.  13    or  FIG.  14   . 
     Referring to  FIG.  15   , an upper surface  2400  of the image sensor package  2200  or the image sensor package  2300 , which is viewed from above, includes the reinforcement member  2023  disposed on the top of the FPCB  2021 . An area of the RFPCB  2020  or the FPCB  2021 , which corresponds to an active area ACT of the image sensor  2024  in which a plurality of pixels is located, may be removed to enable transmission of optical signals. 
     The reinforcement member  2023  may not be provided, and the circuit element  2022  may be disposed on a portion of the RFPCB  2020  or the FPCB  2021 , and the position of the circuit element  2022  and the number of circuit elements are not limited to those illustrated in  FIG.  15   . 
     In addition, another portion (central portion) of the RFPCB  2020  or the FPCB  2021  is exposed without being attached to the reinforcement member  2023  so as to be bent according to the internal design specifications of the camera device  2010 . 
     The left area about the exposed FPCB  2021 , in which the image sensor  2024  is disposed, may be referred to as a first sub-package, the area corresponding to the exposed FPCB  2021  may be referred to as a second sub-package, and the right area about the exposed FPCB  2021 , in which the connector  2026  is disposed may be referred to as a third sub-package. 
       FIG.  16    is a view illustrating an image sensor package according to a comparative example of this disclosure. 
     Referring to  FIG.  16   , the image sensor package  2500  has a function similar to that of the image sensor package  2100  illustrated in  FIG.  12   , but has a structure different from that of the image sensor package illustrated in  FIG.  13    or  FIG.  14   . 
     More specifically, the image sensor  2024  may be electrically connected to a third area AREA 3  via a ceramic PCB  2050  through a flip chip process. 
     The ceramic PCB  2050  is a PCB formed of a ceramic material and has a sufficient strength to perform a flip chip process. However, tool costs may increase due to shrinkage/expansion during processing, and mass-production may be difficult due to an array-type process. 
     In addition, due to the characteristics of the ceramic material, a high firing temperature (about 1300° C.) is required, and it is impossible for the ceramic PCB  2050  to directly insert an FPCB thereinto, like an RFPCB. 
     Therefore, after the ceramic PCB  2050  and the image sensor  2024  are connected to each other, the ceramic PCB  2050  is electrically connected to the FPCB  2021  via a fourth area AREA 4  through an anisotropic conducting film (ACF) so that two PCBs are stacked. The ACF process refers to a process of inserting an ACF film between two PCBs and applying heat to bond the two PCBs. 
     The reinforcement member  2023  may be attached to the lower portion of the FPCB  2021  to increase the strength of the FPCB. In order to satisfy the limitation of a design, the connector  2026  may be attached to the lower portion of the FPCB  2021  and the reinforcement member  2023  may be attached to the upper portion of the FPCB  2021  so as to be opposite the connector  2026 . 
     Here, the ceramic PCB  2050  needs to have a fifth thickness (of about 0.6 mm) or more in order to prevent cracks during shrinkage and expansion in the process. 
     In some embodiments, a cavity PCB structure may be used in order to prevent the overall thickness of the image sensor package  2500  from increasing. The cavity PCB structure refers to a structure in which the overall thickness may be reduced while the number of stacked PCBs is maintained. This corresponds to the structure in which the image sensor  2024  is included in the form of a packet inside the ceramic PCB  2050  through a process of etching the ceramic PCB  2050  in an area of a fifth area AREA 5  in which the image sensor  2024  and the ceramic PCB  2050  overlap each other. 
     The overall thickness of the image sensor package  2500  must be increased due to the influence of the ceramic PCB  2050 , and the thickness must be additionally increased since a separate FPCB  2021  needs to be used. 
     In addition, when the cavity structure is used in order to minimize an increase in the thickness of the image sensor package  2500 , an additional etching process is required, and an ACF process for connection between the ceramic PCB  2050  and the FPCB  2021  is additionally required, which increases costs. 
     The RFPCB  2020 , the image sensor  2024 , and the glass  2025  described in  FIGS.  12  to  16    may respectively correspond to the first holder  400 , the image sensor  500 , and the filter  410  described with reference to  FIGS.  1  to  8   . In addition, needless to say, the embodiment described with reference to  FIGS.  12  to  16    may further include the second holder  600  when it includes the technical features of the embodiment described with reference to  FIGS.  1  to  8   . 
     The camera module according to an embodiment of the present invention may include all of a first feature, which is a technical feature of the embodiment described with reference to  FIGS.  1  to  8   , a second feature, which is a technical feature of the embodiment described with reference to  FIGS.  9   a    to  11 , and a third feature, which is a technical feature of the embodiment described with reference to  FIGS.  12  to  16   . 
     For example, the camera module may include all of a feature (an exemplary first feature) in that a first holder and a second holder are coupled and electrically connected to each other by a conductive adhesive and the second holder surrounds an image sensor coupled to the lower portion of the first holder, a feature (an exemplary second feature) in that a housing is disposed on a second printed circuit board, which is adhered at the lower edge thereof to a first adhesive member, which is disposed so as to be spaced apart from a first printed circuit board, and a feature (an exemplary third feature) in that an RFPCB is disposed above an image sensor and is electrically connected to the image sensor. 
     In a camera module according to another embodiment of the present invention, any one of the first to third features may be omitted as needed. 
     In other words, the camera module according to the embodiment of the present invention may include any one of the first to third features, or may include a technical feature obtained by combining at least two of the first to third features. 
     Although only several embodiments have been described above, various other embodiments are possible. The technical ideas of the embodiments described above may be combined into various forms unless they are incompatible techniques, and thereby new embodiments may be realized. 
     The above described features, configurations, effects, and the like are included in at least one of the embodiments, and should not be limited to only one embodiment. In addition, the features, configurations, effects, and the like as illustrated in each embodiment may be implemented with regard to other embodiments as they are combined with one another or modified by those skilled in the art. Thus, content related to these combinations and modifications should be construed as including in the scope and spirit of the embodiments as disclosed in the accompanying claims. 
     INDUSTRIAL APPLICABILITY 
     Embodiments may be applied to a camera module including an image sensor for photographing a subject and a portable device including the same.