Abstract:
An electronic component-embedded printed circuit board includes: a core substrate having a cavity; an electronic component in the cavity; an inner circuit layer formed on the core substrate; a cooling member provided on the first surface of the core substrate at a position over the cavity; and an outer insulating layer on the core substrate. In one embodiment, the cooling member is covering over a portion of the outer surface of the inner circuit layer, and is adhered to the electronic component and to the outer surface of the inner circuit layer through a conductive material.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a U.S. continuation application filed under 37 CFR 1.53(b) claiming priority benefit of U.S. Ser. No. 12/546,502, filed on Aug. 24, 2009, now allowed, which claims earlier foreign priority benefit to Korean Patent Application No. 10-2009-0042610, filed May 15, 2009, entitled “Printed circuit board with electronic components embedded therein including cThis application is a U.S. continuation application filed under 37 CFR 1.53(b) claiming priority benefit of U.S. Ser. No. 12/546,502, filed on Aug. 24, 2009, now allowed, which claims earlier foreign priority benefit to Korean Patent Application No. 10-2009-0042610, filed May 15, 2009, entitled “Printed circuit board with electronic components embedded therein including cooling member and method for fabricating the same”, the above being incorporated by reference in their entirety into this application. 
     
    
     BACKGROUND 
       [0002]    1. Field 
         [0003]    The present invention relates to an electronic component-embedded printed circuit board comprising a cooling member and a method of manufacturing the same. 
         [0004]    2. Description of Related Art 
         [0005]    Recently, since electronic appliances are being smaller and lighter, the development of a printed circuit board embedded with an electronic component such as a semiconductor device or the like has attracted considerable attention. 
         [0006]    In order to realize an electronic component-embedded printed circuit board, many surface mounting technologies for mounting a semiconductor chip such as an integrated circuit (IC) chip or the like on a printed circuit board are available. Wire bonding, flip chip and the like are examples of such surface mounting technologies. 
         [0007]    Here, in the surface mounting method using wire bonding, an electronic component is bonded on a printed circuit board using an adhesive, and a lead frame of the printed circuit board is connected with metallic terminals (that is, pads) of the electronic component through a metal wire in order to transmit and receive information therebetween, and then the electronic component and the metal wire are molded using a thermosetting or thermoplastic resin. 
         [0008]    Further, in the surface mounting method using a flip chip method, external connection terminals (that is, bumps) of several tens of micrometers to several hundreds of micrometers are formed on an electronic component using gold, solder and other metals, and, in opposition to the surface mounting method using wire bonding, the electronic component formed thereon with bumps is turned over to mount the electronic component on a printed circuit board such that the surface of the electronic component faces the printed circuit board. 
         [0009]    However, in these surface mounting methods, since an electronic component is mounted on the surface of a printed circuit board, the total thickness of the printed circuit board mounted thereon with the electronic component cannot be smaller than the sum of the thickness of the printed circuit board and the thickness of the electronic component, and thus it is difficult to manufacture a highly-densified printed circuit board. Further, in these surface mounting methods, since an electronic component is electrically connected with a printed circuit board through connection terminals (pads or bumps), the connection terminals can be cut and corroded, so that the electrical connection between the electronic component and the printed circuit board fails and a malfunction occurs, thereby deteriorating reliability. 
         [0010]    Therefore, it is required that an electronic component be electrically connected with a printed circuit board by mounting the electronic component inside the printed circuit board, not outside the printed circuit board, and then forming a build-up layer thereon, that the distance between wirings is minimized, and that the reliability problems occurring when the electronic component is connected to the printed circuit board through a surface mounting method using wire bond or flip chip are improved upon. 
         [0011]      FIGS. 1 through 7  are sectional views showing a conventional method of manufacturing an electronic component-embedded printed circuit board in which the electronic component is mounted inside the printed circuit board. The method of manufacturing an electronic component-embedded printed circuit board is described with reference to  FIGS. 1 through 7  as follows. 
         [0012]    First, as shown in  FIG. 1 , a core layer  10 , which is composed of a copper clad laminate (CCL) in which an inner circuit layer  11  and a cavity  12  for mounting an electronic component are formed, is prepared. 
         [0013]    Subsequently, as shown in  FIG. 2 , a tape  13  for supporting the electronic component is adhered to one side of the core layer  10 . 
         [0014]    Subsequently, as shown in  FIG. 3 , the electronic component  14  provided thereon with pads  15  is adhered to the tape  13  in a face-up state such that the electronic component is mounted in the cavity  12 . 
         [0015]    Subsequently, as shown in  FIG. 4 , a first outer insulation layer is formed on the other side of the core layer  10  to which the tape  13  is not adhered and in the space between the electronic component and the cavity  12 , and is then cured. 
         [0016]    Subsequently, as shown in  FIG. 5 , the tape  13  adhering to one side of the core layer  10  is removed. 
         [0017]    Subsequently, as shown in  FIG. 6 , a second outer insulation layer  17  is formed on the one side of the core layer  10  from which the tape was removed. 
         [0018]    Finally, as shown in  FIG. 7 , an outer circuit layer  18  having vias connected with the inner circuit layer  11  or the pads  15  of the electronic component  14  is formed on the first outer insulation layer  16  and the second outer insulation layer  17  to manufacture a conventional electronic component-embedded printed circuit board  20 . 
         [0019]    However, the conventional electronic component-embedded printed circuit board  20  manufactured in this way is problematic in that the heat generated from the electronic component  14  is radiated to the outside through the vias  19  serving as interlayer signal passages, so that it is difficult to radiate the heat generated from the inner and outer circuit layers  11  and  18  and the heat generated from the electronic component  14  due to the long operation time of the electronic component  14  to the outside through only vias  19 , with the result that the lifespan of the electronic component is shortened and the performance of the electronic component-embedded printed circuit board  20  is deteriorated. 
         [0020]    In particular, when the electronic component-embedded printed circuit board  20  shown in  FIG. 7  is provided with a multilayered build-up layer, it is much more difficult to radiate the heat generated from the inner and outer circuit layers  11  and  18  and the electronic component  14  to the outside through only the vias  19 . 
       SUMMARY 
       [0021]    Accordingly, the present invention has been made to solve the above-mentioned problems, and the present invention provides an electronic component-embedded printed circuit board having improved heat radiation performance, which is provided with a cooling member, and a method of manufacturing the same. 
         [0022]    An aspect of the present invention provides an electronic component-embedded printed circuit board, including: a core substrate in which a cavity is formed, and of which inner circuit layers are formed; an electronic component which is mounted in the cavity and is provided on one side thereof with pads; a cooling member which is adhered to the other side of the electronic component through a conductive material and is connected to the inner circuit layers; and outer insulation layers which are formed on both sides of the core substrate to cover the electronic component. 
         [0023]    Here, outer circuit layers connecting with the pads or the inner circuit layers through vias may be formed on the outer insulation layers. 
         [0024]    Further, the electronic component may be formed on the other side thereof with ground pads, and the ground pads may be connected with the cooling member through the conductive material. 
         [0025]    Further, the inner circuit layers connected with the cooling member may serve as ground layers. 
         [0026]    Further, the conductive material may be a conductive paste or a conductive adhesive. 
         [0027]    Another aspect of the present invention provides a method of manufacturing an electronic component-embedded printed circuit board, including: fabricating a core substrate provided with a cavity and inner circuit layers and then adhering a tape to one side of the core substrate; adhering an electronic component provided on one side thereof with pads onto the tape such that the electronic component is mounted in the cavity so as to face-up; forming a first outer insulation layer on the other side of the core substrate including the space between the electronic component and the cavity and then removing the tape; and adhering a cooling member connecting with the inner circuit layers onto the other side of the electronic component using a conductive material and then forming a second outer insulation layer on the other side of the core substrate provided with the cooling member. 
         [0028]    Here, the method may further include: forming outer circuit layers connecting with the inner circuit layers or the pads through vias on the first outer insulation layer and the second outer insulation layer, after the forming of the second outer insulation layer. 
         [0029]    Further, the electronic component may be formed on the other side thereof with ground pads, and the ground pads may be connected with the cooling member through the conductive material. 
         [0030]    Further, the inner circuit layers connected with the cooling member may serve as ground layers. 
         [0031]    Further, the conductive material may be a conductive paste or a conductive adhesive. 
         [0032]    Still another aspect of the present invention provides a method of manufacturing an electronic component-embedded printed circuit board, including: fabricating a core substrate provided with a cavity and inner circuit layers and then adhering a tape to one side of the core substrate; adhering an electronic component provided on one side thereof with pads onto the tape such that the electronic component is mounted in the cavity so as to face-down; adhering a cooling member connecting with the inner circuit layers onto the other side of the electronic component using a conductive material and then forming a first outer insulation layer on one side of the core substrate provided with the cooling member; and removing the tape and then forming a second outer insulation layer on the other side of the core substrate including the space between the electronic component and the cavity. 
         [0033]    Here, the method may further include: forming outer circuit layers connecting with the inner circuit layers or the pads through vias on the first outer insulation layer and the second outer insulation layer, after the forming of the second outer insulation layer. 
         [0034]    Further, the electronic component may be formed on the other side thereof with ground pads, and the ground pads may be connected with the cooling member through the conductive material. 
         [0035]    Further, the inner circuit layers connected with the cooling member may serve as ground layers. 
         [0036]    Further, the conductive material may be a conductive paste or a conductive adhesive. 
         [0037]    Still another aspect of the present invention provides a method of manufacturing an electronic component-embedded printed circuit board, including: fabricating a core substrate provided with a cavity and inner circuit layers and then adhering a cooling member to the inner circuit layer of one side of the core substrate to cover the cavity; placing an electronic component provided on one side thereof with pads onto the cooling member such that the electronic component is mounted in the cavity so as to face-up; and forming outer insulation layers on both sides of the core substrate including the space between the electronic component and the cavity. 
         [0038]    Here, the cooling member may be formed therein with holes in order to prevent a void trap from occurring when the outer insulation layers are formed. 
         [0039]    Various objects, advantages and features of the invention will become apparent from the following description of embodiments with reference to the accompanying drawings. 
         [0040]    The terms and words used in the present specification and claims should not be interpreted as being limited to typical meanings or dictionary definitions, but should be interpreted as having meanings and concepts relevant to the technical scope of the present invention based on the rule according to which an inventor can appropriately define the concept of the term to describe the best method he or she knows for carrying out the invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0041]    The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
           [0042]      FIGS. 1 through 7  are sectional views showing a conventional method of manufacturing an electronic component-embedded printed circuit board; 
           [0043]      FIG. 8  is a sectional view showing an electronic component-embedded printed circuit board comprising a cooling member according to a first embodiment of the present invention; 
           [0044]      FIG. 9  is a sectional view showing an electronic component-embedded printed circuit board comprising a cooling member according to a second embodiment of the present invention; 
           [0045]      FIGS. 10 through 18  are sectional views showing a method of manufacturing an electronic component-embedded printed circuit board comprising a cooling member according to a first embodiment of the present invention; 
           [0046]      FIGS. 19 through 26  are sectional views showing a method of manufacturing an electronic component-embedded printed circuit board comprising a cooling member according to a second embodiment of the present invention; and 
           [0047]      FIGS. 27 through 32  are sectional views showing a method of manufacturing an electronic component-embedded printed circuit board comprising a cooling member according to a third embodiment of the present invention. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0048]    The objects, features and advantages of the present invention will be more clearly understood from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same reference numerals are used to designate the same or similar components, and redundant descriptions thereof are omitted. In the description of the present invention, when it is determined that the detailed description of the related art obscure the gist of the present invention, the description thereof will be omitted. 
         [0049]    Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. 
         [0050]      FIG. 8  is a sectional view showing an electronic component-embedded printed circuit board provided with a cooling member according to a first embodiment of the present invention. Hereinafter, the electronic component-embedded printed circuit board  100   a  provided with a cooling member according to a first embodiment of the present invention will be described with reference to  FIG. 8 . 
         [0051]    As shown in  FIG. 8 , the electronic component-embedded printed circuit board  100   a  according to a first embodiment of the present invention includes a core substrate  112 , an electronic component  116 , a cooling member  124 , and outer insulation layers  120  and  126 . 
         [0052]    The core substrate  112  includes through-holes  108  for forming an interlayer connection between inner circuit layers  110 , a cavity  106  for mounting the electronic component, and inner circuit layers  110 , including circuit patterns and lands, formed on both sides of the core substrate  112 . Here, the inner circuit layers  110  serves as ground layers as well as patterning parts. Further, the inner circuit layers  110  serve to improve the heat radiation performance of the printed circuit board because it is connected to the cooling member  124  adhered to the other side of the electronic component  116 . 
         [0053]    The electronic component  116 , which is a semiconductor device, is provided on one side thereof with pads  118 . 
         [0054]    The cooling member  124  serves to radiate the heat generated by the operation of the electronic compound  116 , and is made of a high-conductivity metal. Here, a heat pipe is used as the cooling member  124 , and the cooling member  124  is adhered to the other side of the electronic compound  116  by a conductive material  122 . In this case, any materials can be employed as the conductive material  122  as long as they enable the cooling member  124  to be adhered and fixed onto the other side of the electronic component and enable the heat generated from the electronic component to be transferred to the cooling member  124 . For example, conductive paste or conductive adhesive can be used as the conductive material. Further, since the cooling member  124  is connected with the inner circuit layer  110 , it serves to accomplish the heat radiation function of the cooling member  124  itself and simultaneously to increase heat radiation efficiency by transferring the heat generated from the electronic component to the inner circuit layer. It is preferred that the cooling member  124  be formed therein with holes in order to prevent the void trap occurring when outer insulation layers are formed. 
         [0055]    The outer insulation layers  120  and  126  are formed on both sides of the core substrate  112 , and support the electronic component. Here, outer circuit layers  130  are formed on the outer insulation layers  120  and  126 , and vias  128  for connecting the inner circuit layers  110  or pads  118  with the outer circuit layers  30  are formed in the outer insulation layers  120  and  126 . 
         [0056]    Meanwhile, in the electronic component-embedded printed circuit board  100   a  according to this embodiment of the present invention, a build-up layer  132  including insulation layers and circuit layers may be formed, a solder resist layer  134  for protecting the circuit layers may be formed on the outermost layer of the build-up layer  132 , and solder balls  136  connecting with external appliances may be provided in the solder resist layer  134 . 
         [0057]      FIG. 9  is a sectional view showing an electronic component-embedded printed circuit board provided with a cooling member according to a second embodiment of the present invention. Hereinafter, the electronic component-embedded printed circuit board  100   b  provided with a cooling member according to a second embodiment of the present invention will be described with reference to  FIG. 9 . 
         [0058]    As shown in  FIG. 9 , the electronic component-embedded printed circuit board  100   b  according to this embodiment of the present invention has the same structure as the electronic component-embedded printed circuit board  100   a  according to the first embodiment of the present invention, except that, among the total pads formed on the electronic component  116 , pads  118  connecting with the printed circuit board are formed on one side of the electronic component  116 , and ground pads  118   a  connecting with ground are formed on the other side of the electronic component  116 . 
         [0059]    That is, the ground pads  118   a  formed on the other side of the electronic component  116  are connected to the cooling member  124  through the conductive material, and are connected to an inner circuit layer  110 , functioning as a ground layer, which is connected to the cooling member  124 . 
         [0060]    According to the above structured electronic component-embedded printed circuit board  100   b , heat radiation performance is improved, vias for connecting the ground pads  118  with the inner circuit layer  110  are not additionally required, and only vias  128  for connecting the pads of the electronic component with the outer circuit layer  130  are required, thereby increasing the densification of the printed circuit board. 
         [0061]      FIGS. 10 through 18  are sectional views showing a method of manufacturing an electronic component-embedded printed circuit board provided with a cooling member according to a first embodiment of the present invention. Hereinafter, this method of manufacturing an electronic component-embedded printed circuit board will be described with reference to  FIGS. 10 to 18  as follows. In this embodiment, the electronic component-embedded printed circuit board shown in  FIG. 8  is manufactured by mounting an electronic component in a printed circuit board so that it faces up. 
         [0062]    First, as shown in  FIG. 10 , a base substrate  101 , which is composed of a copper clad laminate (CCL) in which an insulation layer  102  is coated on both sides thereof with copper foil  104 , is provided. 
         [0063]    Subsequently, as shown in  FIG. 11 , a core substrate  112  is fabricated by forming a cavity  106  and through-holes  108  in the base substrate  101  and then forming inner circuit layers  110  thereon. 
         [0064]    In this case, the through-holes  108  for interlayer connection and the cavity  106  for inserting an electronic component are formed in the base substrate  101  using a computer numerical controlled (CNC) drill or a laser drill (CO 2  laser drill or Nd-YAG laser drill), and a copper plating layer (electroless or electrolytic copper plating layer) is formed on the inner walls of the through-holes  108  and on the copper foil  104  through a plating process. Subsequently, a photoresist is applied on the copper plating layer, a photo mask comes closely thereto, and then patterns are formed on the photoresist through exposure/development using UV. Thereafter, unnecessary copper plating and copper foil are etched and thus removed through a chemical reaction using the patterned photoresist as an etching resist, and then the photoresist is removed, thereby forming the inner circuit layers  110 . 
         [0065]    Subsequently, as shown in  FIG. 12 , a tape  114  for supporting an electronic component is adhered to one side of the core substrate  112 . 
         [0066]    In this case, as the tape  114 , a silicon rubber tape or a polyimide (PI) adhesive tape may be used. An electronic component can be positioned at a desired place using the silicon rubber tape or polyimide (PI) adhesive tape. Further, it is preferred that this tape  114  have heat resistance such that it is not deformed by heating or pressurization in a subsequent process of mounting an electronic component in a printed circuit board and then charging a filler therein and then curing the filler to protect the electronic component or a subsequent process of forming an insulation layer. 
         [0067]    Subsequently, as shown in  FIG. 13 , an electronic component  116  is adhered to the tape  114  formed one side of the core substrate  112  such that the electronic component  116  is mounted in the cavity  106 . 
         [0068]    In this case, the electronic component  116  is adhered to the predetermined position of the tape  114 . The electronic component  116  is mounted so as to face-up such that pads, which are electrically connected with circuit layers and are formed on one side of the electronic component  116 , face upward. Here, ground pads  118   a  (refer to  FIG. 9 ) may be formed on the other side of the electronic component  116 . 
         [0069]    Subsequently, as shown in  FIG. 14 , a first outer insulation layer  120  is formed on the other side of the core substrate  112  to which the tape  114  was not adhered, including the space between the electronic component  116  and the cavity  106 . 
         [0070]    In this case, the first outer insulation layer  120  is formed on the other side of the core substrate  112  including the space between the electronic component  116  and the cavity  106  and the through-holes  108  by pressurizing a semi-cured insulation layer, for example, a prepreg. 
         [0071]    Meanwhile, in this step, an encapsulation process may be previously performed in order to stick the electronic component  116  onto the tape  114  and then fix the electronic component  116 . The encapsulation process is a process of charging a filler (not shown) into the space between the cavity  106  and the electronic component  116  such that the electronic component does not move and can be fixed at a predetermined position. Here, the charging of the filler can be performed through a screen printing method, a mask printing method, a dispensing method or the like, and the filler may be a thermosetting resin, a thermoplastic resin or a complex thereof. 
         [0072]    Subsequently, as shown in  FIG. 15 , the core substrate  112  provided with the first outer insulation layer  120  turns over, and then the tape  114  is removed therefrom, and then a cooling member  124  connecting with the inner circuit layers  110  is adhered to the other side of the electronic component using a conductive material  122 , for example, a conductive adhesive. 
         [0073]    Subsequently, as shown in  FIG. 16 , a second outer insulation layer  126  is formed on the core substrate  112  provided with the cooling member  124 . In this case, since the second outer insulation layer  126  is formed in the same manner as the first outer insulation layer  120 , the detailed description thereof will be omitted. 
         [0074]    Meanwhile, as shown in  FIG. 17 , outer circuit layers  130  connecting with the inner circuit layers  110  and/or pads  118  through vias  128  may be formed on the first outer insulation layer  120  and the second outer insulation layer  126 . In this case, the vias  128  are formed to connect the pads  118 , which are not connected to the inner circuit layers  110 , or the inner circuit layers  110  to the outer circuit layers  130 . These vias  128  are formed using a mechanical drill or a laser drill (CO 2  laser drill or Nd-YAG laser drill) or through a wet etching process. 
         [0075]    Moreover, as shown in  FIG. 18 , a build-up layer  132  including the insulation layers and circuit layers may be formed, a solder resist layer  134  for protecting the circuit layers may be formed on the outermost layer of the build-up layer  132 , and solder balls  136  connecting with external appliances may be provided in the solder resist layer  134 . 
         [0076]      FIGS. 19 to 26  are sectional views showing a method of manufacturing an electronic component-embedded printed circuit board provided with a cooling member according to a second embodiment of the present invention. Hereinafter, this method of manufacturing an electronic component-embedded printed circuit board will be described with reference to  FIGS. 19 to 26  as follows. In this embodiment, unlike the first embodiment, the electronic component-embedded printed circuit board is manufactured by mounting an electronic component in a printed circuit board so that it faces down. Meanwhile, in the description of this embodiment, the same reference numerals are used for those constituents which are the same as or correspond to those of the first embodiment, and the duplicate description thereof will be omitted. 
         [0077]    First, as shown in  FIG. 19 , a base substrate  101 , which is composed of a copper clad laminate (CCL) in which an insulation layer  102  is coated on both sides thereof with copper foil  104 , is provided. 
         [0078]    Subsequently, as shown in  FIG. 20 , a core substrate  112  is fabricated by forming a cavity  106  and through-holes  108  in the base substrate  101  and then forming inner circuit layers  110  thereon. 
         [0079]    Subsequently, as shown in  FIG. 21 , a tape  114  for supporting an electronic component is adhered to one side of the core substrate  112 . 
         [0080]    Subsequently, as shown in  FIG. 22 , an electronic component  116  is mounted in the cavity  106  in a face-down manner such that pads  118  formed on one side of the electronic component  116  are adhered to the tape  114  formed one side of the core substrate  112 . Here, ground pads  118   a  (refer to  FIG. 9 ) may be formed on the other side of the electronic component  116 . 
         [0081]    Subsequently, as shown in  FIG. 23 , a cooling member  124  connecting with the inner circuit layers  110  is adhered to the other side of the electronic component using a conductive material  122 , and a first outer insulation layer  120  is formed on the other side of the core substrate  112  provided with the cooling member  124 . In this case, the first outer insulation layer  120  is formed on the other side of the core substrate  112  and in the through-holes  108 . 
         [0082]    Subsequently, as shown in  FIG. 24 , the core substrate  112  provided with the first outer insulation layer  120  is turned over, and then the tape  114  is removed therefrom, and then a second outer insulation layer  126  is formed on the core substrate  112  and in the space between the electronic component  116  and the cavity  106 . 
         [0083]    Meanwhile, as shown in  FIG. 25 , outer circuit layers  130  connecting with the inner circuit layers  110  and/or pads  118  through vias  128  may be formed on the first outer insulation layer  120  and the second outer insulation layer  126 . 
         [0084]    Moreover, as shown in  FIG. 26 , a build-up layer  132  including the insulation layers and circuit layers may be formed, a solder resist layer  134  for protecting the circuit layers may be formed on the outermost layer of the build-up layer  132 , and solder balls  136  connecting with external appliances may be provided in the solder resist layer  134 . 
         [0085]      FIGS. 27 through 32  are sectional views showing a method of manufacturing an electronic component-embedded printed circuit board provided with a cooling member according to a third embodiment of the present invention. Hereinafter, this method of manufacturing an electronic component-embedded printed circuit board will be described with reference to  FIGS. 27 to 32  as follows. This embodiment relates to an electronic component-embedded printed circuit board in which a cooling member is directly used to fix an electronic component instead of using an additional tape and outer insulation layers are simultaneously formed. Meanwhile, in the description of this embodiment, the same reference numerals are used for those constituents which are the same as or correspond to those of the first embodiment, and the duplicate description thereof will be omitted. 
         [0086]    First, as shown in  FIG. 27 , a core substrate  112  is fabricated by forming a cavity  106  and through-holes  108  in a base substrate  101  and then forming inner circuit layers  110  thereon. 
         [0087]    Subsequently, as shown in  FIG. 28A , a cooling member  124  connecting with the inner circuit layers  110  is adhered to one side of the core substrate  112  using a conductive material  122  to cover the cavity  106 . 
         [0088]    In this case, since the cooling member  124  functions as a support layer, it is not required to additionally use a tape. 
         [0089]    Meanwhile, it is preferred that the cooling member  124  be provided therein with holes  124   a  in order to prevent a void trap from occurring when the outer insulation layers  125  are pressurized (refer to  FIG. 28B ). 
         [0090]    Subsequently, as shown in  FIG. 29 , an electronic component  116  is mounted on the cooling member  124  so as to face-up. 
         [0091]    Subsequently, as shown in  FIG. 30 , outer insulation layers  125  are simultaneously pressurized and laminated on both sides of the core substrate  112  and in the through-holes  108  and the space between the electronic component  116  and the cavity  106 . 
         [0092]    Subsequently, as shown in  FIG. 31 , outer circuit layers  130  connecting with the inner circuit layers  110  and/or pads  118  through vias  128  are formed on the outer insulation layers  125 . 
         [0093]    Moreover, as shown in  FIG. 32 , a build-up layer  132  including the insulation layers and circuit layers may be formed, a solder resist layer  134  for protecting the circuit layers may be formed on the outermost layer of the build-up layer  132 , and solder balls  136  connecting with external appliances may be provided in the solder resist layer  134 . 
         [0094]    As described above, according to the electronic component-embedded printed circuit board of the present invention, since a cooling member is mounted in the printed circuit board in a state in which it is adhered to one side of an electronic component, the heat radiation performance thereof can be improved and the thickness thereof can be decreased. 
         [0095]    Further, according to the electronic component-embedded printed circuit board of the present invention, since a cooling member is connected with inner circuit layers, the heat radiation performance thereof can be further improved 
         [0096]    Further, the present invention provides a method of manufacturing an electronic component-embedded printed circuit board, which can use a conventional process of manufacturing an electronic component-embedded printed circuit board. 
         [0097]    Further, according to the electronic component-embedded printed circuit board of the present invention, a cooling member is adhered to ground pads in a state in which the ground pads are formed on one side of an electronic component, and the cooling member is connected with inner circuit layers serving as ground layers, so that the heat radiation performance of the printed circuit board is improved, an additional structure for connecting the ground pads and the inner circuit layers is not required, and the densification of the printed circuit board can be increased. 
         [0098]    Furthermore, according to the electronic component-embedded printed circuit board of the present invention, since holes are formed in a cooling member, it is possible to prevent a void trap from occurring when the outer insulation layers are formed. 
         [0099]    Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. 
         [0100]    Simple modifications, additions and substitutions of the present invention belong to the scope of the present invention, and the specific scope of the present invention will be clearly defined by the appended claims.