Abstract:
Disclosed herein are a printed circuit board and a method of manufacturing the same, which can achieve reliable heat resistance because heat radiation characteristics are improved, and processing costs of which are reduced because processing times are shortened.

Description:
CROSS REFERENCE TO RELATED APPLICATION 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2006-0060803, filed Jun. 30, 2006, entitled “Printed Circuit Board and Fabricating Method of the Same”, which is hereby incorporated by reference in its entirety into this application. 
       BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to a printed circuit board and a method of manufacturing the same, and, more particularly, to a printed circuit board and a method of manufacturing the same, which can secure reliability for heat resistance by improving heat radiation characteristics, and can reduce processing costs by shortening processing times. 
         [0004]    2. Description of the Related Art 
         [0005]    As portable electronic goods become miniaturized, space for mounting semiconductors therein is decreasing, and the electronic products are becoming more multi-functional. Accordingly, a semiconductor package must be light, thin, short and small to increase the mounting efficiency of semiconductors per unit volume of space. 
         [0006]    As such, in order to allow the package to be light, thin short and small, a method of decreasing the thicknesses of parts and the printed circuit board, or of installing parts normally mounted on the surface of the printed circuit board in the interior of the printed circuit board, rather than on the surface thereof, is required. Thus, various methods of manufacturing a printed circuit board so as to embed chips therein have been researched. 
         [0007]    Thus, methods of mounting chips in a printed circuit board, as disclosed in Korean Unexamined Patent Publication No. 2006-5840 and United States Unexamined Patent Publication No. 2005-0255303, have been developed in the form of forming a space in a printed circuit board and then embedding parts into the space. 
         [0008]    However, when chips are mounted in a printed circuit board using these technologies, there is a problem in that processing times and processing costs are increased because holes must be additionally formed in an insulating material, and then interconnections are formed through a plating process for inter-layer connection. 
         [0009]    Further, these conventional methods of embedding chips in a printed circuit board have a problem in that, when parts having thicknesses different from each other are embedded in a printed circuit board, the precision of the portion connected with each of the parts is decreased. 
       SUMMARY OF THE INVENTION 
       [0010]    Accordingly, the present invention has been made in order to solve the above problems, and an object of the present invention is to provide a printed circuit board and a method of manufacturing the same, which can reduce processing costs by shortening processing times. 
         [0011]    Another object of the present invention is to provide a printed circuit board and a method of manufacturing the same, which can increase the precision of the portion connected with each part embedded in a printed circuit board without regard to the thickness of the parts mounted therein. 
         [0012]    A further object of the present invention is to provide a printed circuit board and a method of manufacturing the same, which has an improved heat radiation effect by increasing heat radiation characteristics in horizontal and vertical directions. 
         [0013]    A still further object of the present invention is to provide a printed circuit board and a method of manufacturing the same, which can decrease a phenomenon of signal interference between parts by shielding the parts embedded in a printed circuit board. 
         [0014]    In order to accomplish the above objects, according to an aspect of the present invention, a printed circuit board includes a first insulation layer; a plurality of interlayer connection members, which are conductors, formed on the first insulation layer; a second insulation layer layered on the first insulation layer to have the same thickness as the connection member; a third insulation layer layered on the second insulation layer; circuit patterns formed on the first insulation layer and the third insulation layer, respectively; and a plurality of blind via holes formed in the first insulation layer and the third insulation layer to electrically connect the circuit patterns with the connection members. 
         [0015]    According to another aspect of the present invention, a printed circuit board includes a first insulation layer; a plurality of interlayer connection members, which are conductors, formed on the first insulation layer; a second insulation layer layered on the first insulation layer and having a thickness enough to be capable of filling spaces between the connection members; a third insulation layer layered on the second insulation layer; circuit patterns formed on the first insulation layer and the third insulation layer, respectively; and a plurality of blind via holes formed in the first insulation layer and the third insulation layer to electrically connect the circuit patterns with the connection members. 
         [0016]    According to a further aspect of the present invention, a method of manufacturing a printed circuit board includes the steps of (a) providing a copper clad laminate, in which copper foil is layered on first and second surfaces of a first insulation layer; (b) forming a plurality of interlayer connection members, which are conductors, by selectively removing the copper foil layered on the first surface of the first insulation layer; (c) layering a second insulation layer and an RCC, one surface of which is coated with a copper foil, on the first insulation layer; (d) forming blind via holes in an outermost copper foil and the first insulation layer, and another outermost copper foil and the second insulation layer; and (e) forming circuit patterns by patterning the outermost copper foil. 
         [0017]    According to a still further aspect of the present invention, a method of manufacturing a printed circuit board includes the steps of (a) providing a copper clad laminate in which copper foil is layered on first and second surfaces of a first insulation layer; (b) forming a plurality of interlayer connection members, which are conductors, by selectively removing the copper foil layered on the first surface of the first insulation layer; (c) layering a second insulation layer on the first insulation layer; (d) layering a third insulation layer and an RCC, one surface of which is coated with copper foil, on the second insulation layer; (e) forming blind via holes in the first insulation layer and the third insulation layer; and (f) forming circuit patterns by patterning the outermost copper foil. 
     
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0018]      FIG. 1  is a sectional view showing a printed circuit board according to a first embodiment of the present invention; 
           [0019]      FIG. 2  is a sectional view showing a printed circuit board according to a second embodiment of the present invention; 
           [0020]      FIG. 3  is a sectional view showing a printed circuit board according to a third embodiment of the present invention; 
           [0021]      FIGS. 4A to 4E  are process sectional views showing a method of manufacturing the printed circuit board shown in  FIG. 3 ; 
           [0022]      FIG. 5  is a sectional view showing a printed circuit board according to a fourth embodiment of the present invention; 
           [0023]      FIG. 6  is a sectional view showing a printed circuit board according to a fifth embodiment of the present invention; 
           [0024]      FIG. 7  is a sectional view showing a printed circuit board according to a sixth embodiment of the present invention; and 
           [0025]      FIGS. 8A to 8D  are process sectional views showing a method of manufacturing the printed circuit board shown in  FIG. 7 . 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0026]    Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. 
         [0027]    Reference now should be made to the drawings, in which the same reference numerals are used throughout the different drawings to designate the same or similar components. 
         [0028]      FIG. 1  is a sectional view showing a printed circuit board according to a first embodiment of the present invention. 
         [0029]    Referring to  FIG. 1 , a printed circuit board according to a first embodiment of the present invention includes a substrate  10  including a first insulation layer  2 , a first circuit pattern  4   a  layered on the lower portion of the first insulation layer  2 , and a plurality of interlayer connection members  6   a  and heat radiation layers  6  formed on the upper portion of the first insulation layer  2 ; a second insulation layer  12  layered on the first insulation layer  2 ; a third insulation layer  14  layered on the upper portions of the second insulation layer  12 , the connection members  6   a  and the heat radiation layers  6 ; and a second circuit pattern  4   b  formed on the third insulation layer  14 . In this case, the same materials or different materials are used as the first insulation layer  2 , the second insulation layer  12  and the third insulation layer  14 . 
         [0030]    In the printed circuit board according to a first embodiment of the present invention, a plurality of blind via holes  16  is formed in the first insulation layer  2  and the third insulation layer  14  to electrically connect the plurality of connection members  6   a  and the heat radiation layers  6  to the first circuit pattern  4   a  and the second circuit pattern  4   b.    
         [0031]    The substrate  10  includes a first insulation layer  2 , a first circuit pattern  4   a  formed on the lower portion of the first insulation layer  2 , and connection members  6   a  and heat radiation layers  6  formed on the upper portion of the first insulation layer  2 . 
         [0032]    The connection members  6   a  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , and are thus used as inner via holes for the interlayer connection of the second insulation layer  12 , that is, for the electrical connection of the upper portion and lower portion thereof. Each of the connection members  6   a  is thicker than a first copper foil  4   a  and is formed in the general shape of a cylinder, thereby serving to discharge heat generated in the printed circuit board in a vertical direction. In this case, each of the connection members  6   a  may be formed in the shape of a polygon such as a triangle or a rectangle, rather than in the shape of a cylinder. 
         [0033]    The heat radiation layers  6  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , so as to be thicker than the first copper foil  4   a , and thus serve to discharge heat generated in the printed circuit board in a vertical or horizontal direction. In order to discharge the heat, the heat radiation layers  6  are electrically connected to the first circuit pattern  4   a  and the second circuit pattern  4   b  through the blind via holes  16 . 
         [0034]    These heat radiation layers  6  are formed between the interlayer connection member  6   a  so that widths of upper surface and lower surfaces thereof are greater than those of the upper surface and lower surface of the connection member  6   a.    
         [0035]    In this case, the connection member  6   a  and the heat radiation layers  6  have greater thicknesses than the first insulation layer  2  and the third insulation layer  14 . 
         [0036]      FIG. 2  is a sectional view showing a printed circuit board according to a second embodiment of the present invention. 
         [0037]    Here, the same reference numerals are used in the second embodiment of the present invention to designate components the same as, or similar to, those of the first embodiment of the present invention. 
         [0038]    Referring to  FIG. 2 , a printed circuit board according to a second embodiment of the present invention includes a substrate  10  including a first insulation layer  2 , a first circuit pattern  4   a  layered on the lower portion of the first insulation layer  2 , and a plurality of interlayer connection members  6   a  formed on the upper portion of the first insulation layer  2 ; a second insulation layer  12  layered on the first insulation layer  2 ; a third insulation layer  14  layered on the upper portions of the second insulation layer  12  and the connection members  6   a ; and a second circuit pattern  4   b  formed on the third insulation layer  14 . Here, the same materials or different materials are used as the first insulation layer  2 , the second insulation layer  12  and the third insulation layer  14 . 
         [0039]    In the printed circuit board according to a second embodiment of the present invention, a plurality of blind via holes  16  is formed in the first insulation layer  2  and the third insulation layer  14  to electrically connect the plurality of connection members  6   a  and the parts  22  to the first circuit pattern  4   a  and the second circuit pattern  4   b.    
         [0040]    The substrate  10  includes a first insulation layer  2 , a first circuit pattern  4   a  formed on the lower portion of the first insulation layer  2 , and connection members  6   a  formed on the upper portion of the first insulation layer  2 . 
         [0041]    The connection members  6   a  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , and are thus used as inner via holes for the interlayer connection of the second insulation layer  12 , that is, for the electrical connection of the upper portion and lower portion thereof. 
         [0042]    Further, the connection members  6   a  serve as a shielding film for blocking a signal interference phenomenon between the parts embedded in the printed circuit board. 
         [0043]    These connection members  6   a  have thicknesses the same as or greater than those of the parts  22  embedded in the printed circuit board and are formed in the general shape of a cylinder, thereby serving to discharge heat generated in the printed circuit board in a vertical direction. In this case, the connection members  6   a , enclosing the parts  22  embedded in the printed circuit board, may be formed in the shape of a polygon, such as a triangle or a rectangle, rather than in the shape of cylinder. 
         [0044]    The parts  22  are any one, or two or more, of a bare IC chip, a passive part, a part having a module packed therein, and a module substrate having various components packed therein. 
         [0045]    In this case, the parts  22  have the same or different thicknesses from each other when different kinds of parts are embedded in the printed circuit board. 
         [0046]    These parts  22  are mounted between the interlayer connection members  6   a.    
         [0047]      FIG. 3  is a sectional view showing a printed circuit board according to a third embodiment of the present invention. 
         [0048]    Here, the same reference numerals are used in the third embodiment of the present invention to designate components that are the same as or similar to those of the first embodiment of the present invention. 
         [0049]    Referring to  FIG. 3 , a printed circuit board according to a third embodiment of the present invention includes a substrate  10  including a first insulation layer  2 , a first circuit pattern  4   a  layered on the lower portion of the first insulation layer  2 , and a plurality of interlayer connection members  6   a  and heat radiation layers  6  formed on the upper portion of the first insulation layer  2 ; a second insulation layer  12  layered on the first insulation layer  2 ; parts  22  mounted in the second insulation layer  12 ; a third insulation layer  14  layered on the upper portions of the second insulation layer  12 , the connection members  6   a  and the heat radiation layers  6 ; and a second circuit pattern  4   b  formed on the third insulation layer  14 . Here, the same materials or different materials are used as the first insulation layer  2 , the second insulation layer  12  and the third insulation layer  14 . 
         [0050]    In the printed circuit board according to a third embodiment of the present invention, a plurality of blind via holes  16  is formed in the first insulation layer  2  and the third insulation layer  14  to electrically connect the plurality of connection members  6   a , the heat radiation layers  6  and the parts  22  to the first circuit pattern  4   a  and the second circuit pattern  4   b.    
         [0051]    The substrate  10  includes a first insulation layer  2 , a first circuit pattern  4   a  formed on the lower portion of the first insulation layer  2 , and connection members  6   a  and a heat radiation layer  6  formed on the upper portion of the first insulation layer  2 . 
         [0052]    The connection members  6   a  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , and are thus used as inner via holes for the interlayer connection of the second insulation layer  12 , that is, for the electrical connection of the upper portion and lower portion thereof. 
         [0053]    These connection members  6   a  are formed in the general shape of a cylinder, thereby serving to discharge heat generated in the printed circuit board in a vertical direction. In this case, the connection members  6   a  may be formed in the shape of a polygon, such as a triangle or a rectangle, rather than in the shape of cylinder. 
         [0054]    The heat radiation layers  6  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , and thus serve to discharge heat generated in the printed circuit board in a vertical or horizontal direction. In order to discharge the heat, the heat radiation layers  6  are electrically connected to the first circuit pattern  4   a  and the second circuit pattern  4   b  through the blind via holes  16 . 
         [0055]    These heat radiation layers  6  are formed between the interlayer connection members  6   a  such that widths of upper and lower surfaces thereof are greater than those of the upper surface and lower surface of the connection member  6   a.    
         [0056]    Here, the connection members  6   a  serve as a shielding film for blocking a signal interference phenomenon between the parts embedded in the printed circuit board. 
         [0057]    These connection members  6   a  and heat radiation layers  6  have thicknesses the same as or greater than those of the parts  22  embedded in the printed circuit board. 
         [0058]    The parts  22  are any one, or two or more, of a bare IC chip, a passive part, a part having a module packed therein, and a module substrate having various components packed therein. 
         [0059]    In this case, the parts  22  have the same or different thicknesses from each other when different kinds of parts are embedded in the printed circuit board. 
         [0060]    These parts  22  are mounted between the interlayer connection members  6   a.    
         [0061]    As described above, in the printed circuit board according to the embodiment of the present invention, the heat radiation effect in a vertical direction can be improved because the connection members  6   a  formed of cylindrical conductors are used as inner via holes. 
         [0062]    Further, in the printed circuit board according to the embodiment of the present invention, the heat radiation effect in vertical and horizontal directions can be improved because heat radiation layers  6  having large areas are formed in the printed circuit board. 
         [0063]    Further, in the printed circuit board according to the embodiment of the present invention, a signal interference phenomenon between the parts embedded in the printed circuit board can be reduced because the connection members  6   a  and heat radiation layers  6  shield the parts mounted in the printed circuit board. 
         [0064]    Further, in the printed circuit board according to the embodiment of the present invention, the shielding effect can be improved because a signal interference effect in the printed circuit board is reduced by connecting the connection members  6   a  and heat radiation layers  6  to the external ground through the blind via holes  16  formed in the lower portion of the first insulation layer  2  when the parts are mounted in the printed circuit board. 
         [0065]      FIGS. 4A to 4E  are process sectional views showing the method of manufacturing the printed circuit board shown in  FIG. 3 . 
         [0066]    First, as shown in  FIG. 4A , a substrate  10 , which is a copper clad laminate in which a first copper foil  4   a  and a second copper foil  6 , each of which has a different thickness, are attached on a first surface and a second surface of a first insulation layer  2 , is provided. In this case, the second copper foil  6 , as shown in  FIGS. 2 and 3 , is as thick as or thicker than parts to be embedded in the printed circuit board when the parts are embedded therein, and the second copper foil  6 , as shown in  FIG. 1 , is thicker than the first copper foil  4   a  when the parts are not embedded therein. 
         [0067]    Next, as shown in  FIG. 4B , connection members  6   a , heat radiation layers  6  and/or part mounting regions  20  are formed by selectively removing the second copper foil  6  using an etching solution. In this case, the connection members  6   a  are used as inner via holes. Further, the heat radiation layers  6  and/or the part mounting regions  20  are formed between the interlayer connection members  6   a.    
         [0068]    When the second copper foil  6  is selectively removed at the time of the etching process thereof, the connection members  6   a  are necessarily formed, but any one of the heat radiation layers  6  and the part mounting regions  20  need not be formed. 
         [0069]    That is, the part mounting regions  20 , as shown in  FIG. 1 , need not be formed when the parts are not embedded in the printed circuit board, and the heat radiation layers  6 , as shown in  FIG. 2 , need not be formed when a plurality of parts  22  is embedded in the printed circuit board. 
         [0070]    However, when the parts  22  are embedded in the printed circuit board, it is preferred that both the part mounting regions  20  and the heat radiation layers  6 , as shown in  FIG. 3 , be formed. 
         [0071]    When only the connection members  6   a  and the heat radiation layers  6 , as shown in  FIG. 1 , are formed by selectively removing the second copper foil  6 , a second insulation layer  12  is placed on a first insulation layer  2 , and then the second insulation layer  12  is layered on the first insulation layer  2  by applying heat and pressure thereto using a press. In this case, the second insulation layer  12  is formed to have the same thickness as the connection members  6   a  and the heat radiation layers  6 . Further, the heat radiation layers  6  are formed between the interlayer connection members  6   a  such that widths of the upper surface and lower surface thereof are greater than those of the upper surface and lower surface of the connection members  6   a.    
         [0072]    However, when only the connection members  6   a  and the part mounting regions  20 , as shown in  FIG. 2 , are formed by selectively removing the second copper foil  6 , parts  22  are mounted in the part mounting regions  20 , and then a second insulation layer  12  is placed on a first insulation layer  2 , and then the second insulation layer  12  is layered on the first insulation layer  2  by applying heat and pressure thereto using a press. In this case, the second insulation layer  12  is formed to have the same thickness as the connection members  6   a.    
         [0073]    Further, when the connection members  6   a , the heat radiation layers  6  and the part mounting regions  20 , as shown in  FIG. 3 , are formed by selectively removing the second copper foil  6 , a part  22  is mounted in the part mounting regions  20 , a second insulation layer  12  is placed on a first insulation layer  2 , and then the second insulation layer  12  is layered on the first insulation layer  2  by applying heat and pressure thereto using a press. In this case, the second insulation layer  12  is formed to have the same thickness as the connection members  6   a  and the heat radiation layers  6 . Further, the heat radiation layers  6  are formed such that widths of the upper surface and lower surface thereof are greater than those of the upper surface and lower surface of the connection members  6   a.    
         [0074]    After the second insulation layer  12  is deposited on the first insulation layer  2 , if residue from the second insulation layer  12  consequently remains on the connection members  6   a  and the heat radiation layers  6 , the upper portion of the substrate, that is, the upper portions of the second insulation layer  12 , the connection members  6   a  and the heat radiation layers  6 , is abraded using an abrader. Accordingly, the residue from the second insulation layer  12  remaining on the upper portions of the connection members  6   a  and the heat radiation layers  6  is removed. 
         [0075]    Then, as shown in  FIG. 4D , a Resin Coated Copper foil (RCC), including a third insulation layer  14  and a third copper foil  4   b , is deposited on the second insulation layer  2  by applying heat and pressure thereto using a press. Here, the third insulation layer  14  may be deposited on the second insulation layer  12 , and then the third copper foil  4   b  may be deposited on the second insulation layer  12 . 
         [0076]    After the third copper foil  4   b  is deposited on the second insulation layer  12 , blind via holes  16  are formed using a laser to connect the first copper foil  4   a  and the third copper foil  4   b  with the connection members  6   a  and the heat radiation layers  6 . 
         [0077]    After the blind via holes  16  are formed, as shown in  FIG. 4E , conductivity is imparted to the blind via holes  16  through an electroless plating process, and then circuit patterns  4   a  and  4   b  are formed through an image forming process. 
         [0078]    As described above, in the method of manufacturing a printed circuit board according to the embodiment of the present invention, various parts having different sizes and thicknesses, such as a bare IC chip, a passive part, a part having a module packed therein, and a module substrate having various components packed therein, can be embedded in the printed circuit board, and the precision connection with each of the parts can be also increased, because the second copper foil  6 , which is as thick as or thicker than each of the parts embedded in the printed circuit board, is selectively removed, the parts are mounted in the portions from which the second copper foil  6  was removed, the second insulation layer  12  is deposited on the parts, and then the via holes are formed, and thus the terminals of the parts are connected to the circuit patterns through the via holes. 
         [0079]    Further, in the method of manufacturing a printed circuit board according to the embodiment of the present invention, the connection members  6   a  formed by selectively removing the second copper foil  6  are used as inner via holes, so that an electroless plating process and an electrolytic plating process, which are performed to provide conductivity for the inner via holes, which pass through the second insulation layer  12 , need not be performed, thereby decreasing processing times and processing costs. 
         [0080]    Further, in the method of manufacturing a printed circuit board according to the embodiment of the present invention, the connection members  6   a , which are cylindrical conductors, are used as inner via holes, so that heat radiation effect in a vertical direction can be improved. Further, the heat radiation layers having large widths are formed in a substrate, so that heat in the substrate is discharged in both vertical and horizontal directions, thereby increasing the heat radiation effect. 
         [0081]    Further, in the method of manufacturing a printed circuit board according to the embodiment of the present invention, a signal interference phenomenon between the parts embedded in the printed circuit board can be reduced, because the parts embedded therein are shielded by the connection members  6   a  and the heat radiation layers  6 . 
         [0082]      FIG. 5  is a sectional view showing a printed circuit board according to a fourth embodiment of the present invention. 
         [0083]    Here, the same reference numerals are used in the fourth embodiment of the present invention to designate components the same as, or similar to, those of the first embodiment of the present invention. 
         [0084]    Referring to  FIG. 5 , a printed circuit board according to a fourth embodiment of the present invention includes a substrate  10  including a first insulation layer  2 , a first circuit pattern  4   a  layered on the lower portion of the first insulation layer  2 , and a plurality of interlayer connection members  6   a  and heat radiation layers  6  formed on the upper portion of the first insulation layer  2 ; a second insulation layer  12  layered on the first insulation layer  2 , the connection members  6   a  and the heat radiation layers  6 ; and a second circuit pattern  4   b  formed on the second insulation layer  12 . In this case, the same materials or different materials are used as the first insulation layer  2  and the second insulation layer  12 . 
         [0085]    In the printed circuit board according to a fourth embodiment of the present invention, a plurality of blind via holes  16  is formed in the first insulation layer  2  and the second insulation layer  12  to electrically connect the plurality of connection members  6   a  and the heat radiation layers  6  to the first circuit pattern  4   a  and the second circuit pattern  4   b.    
         [0086]    The substrate  10  includes a first insulation layer  2 , a first circuit pattern  4   a  formed on the lower portion of the first insulation layer  2 , and connection members  6   a  and heat radiation layers  6  formed on the upper portion of the first insulation layer  2 . 
         [0087]    The connection members  6   a  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , and are thus used as inner via holes for the interlayer connection of the second insulation layer  12 , that is, for the electrical connection of the upper portion and lower portion thereof. Each of the connection members  6   a  is thicker than a first copper foil  4   a  and is formed in the general shape of a cylinder, thereby serving to discharge heat generated in the printed circuit board in a vertical direction. In this case, each of the connection members  6   a  may be formed in the shape of a polygon, such as a triangle or a rectangle, rather than in the shape of a cylinder. 
         [0088]    The heat radiation layers  6  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , to be thicker than the first copper foil  4   a , and thus serves to discharge heat generated in the printed circuit board in a vertical or horizontal direction. 
         [0089]    These heat radiation layers  6  are formed between the interlayer connection members  6   a  such that widths of the upper surface and lower surface thereof are greater than those of the upper surface and lower surface of the connection member  6   a.    
         [0090]      FIG. 6  is a sectional view showing a printed circuit board according to a fifth embodiment of the present invention. 
         [0091]    Here, the same reference numerals are used in the fifth embodiment of the present invention to designate components that are the same as, or similar to, those of the first embodiment of the present invention. 
         [0092]    Referring to  FIG. 6 , a printed circuit board according to a fifth embodiment of the present invention includes a substrate  10  including a first insulation layer  2 , a first circuit pattern  4   a  layered on the lower portion of the first insulation layer  2 , and a plurality of interlayer connection members  6   a  formed on the upper portion of the first insulation layer  2 ; a second insulation layer  12  layered on the first insulation layer  2  and the connection members  6   a ; parts  22  mounted in the second insulation layer  12 ; and a second circuit pattern  4   b  formed on the second insulation layer  12 . Here, the same materials or different materials are used as the first insulation layer  2  and the second insulation layer  12 . 
         [0093]    In the printed circuit board according to a fifth embodiment of the present invention, a plurality of blind via holes  16  is formed in the first insulation layer  2  and the second insulation layer  12  to electrically connect the plurality of connection members  6   a  and the parts  22  to the first circuit pattern  4   a  and the second circuit pattern  4   b.    
         [0094]    The substrate  10  includes a first insulation layer  2 , a first circuit pattern  4   a  formed on the lower portion of the first insulation layer  2 , and connection members  6   a  formed on the upper portion of the first insulation layer  2 . 
         [0095]    The connection members  6   a  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , and are thus used as inner via holes for the interlayer connection of the second insulation layer  12 , that is, for the electrical connection between the upper portion and lower portion thereof. 
         [0096]    Further, the connection members  6   a  serve as a shielding film for blocking a signal interference phenomenon between the parts embedded in the printed circuit board. 
         [0097]    These connection members  6   a  are as thick as or thicker than the parts  22  embedded in the printed circuit board and are formed in the general shape of a cylinder, thereby serving to discharge heat generated in the printed circuit board in a vertical direction. In this case, the connection members  6   a , enclosing the parts  22  embedded in the printed circuit board, may be formed in the shape of a polygon, such as a triangle or a rectangle, rather than in the shape of cylinder. 
         [0098]    The parts  22  are any one, or two or more, of a bare IC chip, a passive part, a part having a module packed therein, and a module substrate having various components packed therein. 
         [0099]    In this case, the parts  22  have the same or different thicknesses from each other when different kinds of parts are embedded in the printed circuit board. 
         [0100]    These parts  22  are mounted between the interlayer connection members  6   a.    
         [0101]      FIG. 7  is a sectional view showing a printed circuit board according to a sixth embodiment of the present invention. 
         [0102]    Here, the same reference numerals are used in the sixth embodiment of the present invention to designate components the same as, or similar to, those of the first embodiment of the present invention. 
         [0103]    Referring to  FIG. 7 , a printed circuit board according to a sixth embodiment of the present invention includes a substrate  10  including a first insulation layer  2 , a first circuit pattern  4   a  layered on the lower portion of the first insulation layer  2 , and a plurality of interlayer connection members  6   a  and heat radiation layers  6  formed on the upper portion of the first insulation layer  2 ; a second insulation layer  12  layered on the first insulation layer  2 , the connection members  6   a  and the heat radiation layers  6 ; parts  22  mounted in the second insulation layer  12 ; and a second circuit pattern  4   b  formed on the second insulation layer  12 . In this case, the same materials or different materials are used as the first insulation layer  2  and the second insulation layer  12 . 
         [0104]    In the printed circuit board according to a sixth embodiment of the present invention, a plurality of blind via holes  16  is formed in the first insulation layer  2  and the second insulation layer  12  to electrically connect the plurality of connection members  6   a , the heat radiation layers  6  and the parts  22  to the first circuit pattern  4   a  and the second circuit pattern  4   b.    
         [0105]    The substrate  10  includes a first insulation layer  2 , a first circuit pattern  4   a  formed on the lower portion of the first insulation layer  2 , and connection members  6   a  and a heat radiation layer  6  formed on the upper portion of the first insulation layer  2 . 
         [0106]    The connection members  6   a  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , and are thus used as inner via holes for the interlayer connection of the second insulation layer  12 , that is, for the electrical connection of the upper portion and lower portion thereof. 
         [0107]    These connection members  6   a  are formed in the general shape of a cylinder, thereby serving to discharge heat generated in the printed circuit board in a vertical direction. In this case, the connection members  6   a  may be formed in the shape of a polygon, such as a triangle or a rectangle, rather than in the shape of cylinder. 
         [0108]    The heat radiation layers  6  are formed on the upper portion of the first insulation layer  2 , that is, in the inner portion of the second insulation layer  12 , and thus serve to discharge heat generated in the printed circuit board in a vertical or horizontal direction. 
         [0109]    These heat radiation layers  6  are formed between the interlayer connection members  6   a  such that widths of the upper surface and lower surface thereof are greater than those of the upper surface and lower surface of the connection member  6   a.    
         [0110]    Here, the connection members  6   a  and the heat radiation layers  6  serve as a shielding film for blocking a signal interference phenomenon between the parts embedded in the printed circuit board. 
         [0111]    These connection members  6   a  and heat radiation layers  6  are as thick as or thicker than the parts  22  embedded in the printed circuit board. 
         [0112]    The parts  22  are any one, or two or more, of a bare IC chip, a passive part, a part having a module packed therein, and a module substrate having various components packed therein. 
         [0113]    In this case, the thicknesses of the parts  22  are the same as or different from each other when different kinds of parts are embedded in the printed circuit board. 
         [0114]    These parts  22  are mounted between the interlayer connection members  6   a.    
         [0115]    As described above, in the printed circuit board according to the embodiment of the present invention, a heat radiation effect in a vertical direction can be improved because the connection members  6   a  formed of cylindrical conductors are used as inner via holes. 
         [0116]    Further, in the printed circuit board according to the embodiment of the present invention, a heat radiation effect in vertical and horizontal directions can be improved because heat radiation layers  6  having large areas are in the printed circuit board. 
         [0117]    Further, in the printed circuit board according to the embodiment of the present invention, the signal interference phenomenon between the parts embedded in the printed circuit board can be reduced because the connection members  6   a  and heat radiation layers  6  shield the parts embedded in the printed circuit board. 
         [0118]    Further, in the printed circuit board according to the embodiment of the present invention, the shielding effect can be improved because the signal interference effect in the printed circuit board is reduced by connecting the connection members  6   a  and heat radiation layers  6  to the external ground through the blind via holes  16  formed on the lower portion of the first insulation layer  2  when the parts are embedded in the printed circuit board. 
         [0119]      FIGS. 8A to 8D  are process sectional views showing a method of manufacturing the printed circuit board shown in  FIG. 7 . 
         [0120]    First, as shown in  FIG. 8A , a substrate  10 , which is a copper clad laminate in which a first copper foil  4   a  and a second copper foil  6 , each of which has a different thickness, are attached on a first surface and a second surface of a first insulation layer  2 , is provided. In this case, the second copper foil  6 , as shown in  FIGS. 6 and 7 , is as thick as or thicker than parts to be embedded in the printed circuit board when the parts are mounted therein, and the second copper foil  6 , as shown in  FIG. 5 , is thicker than the first copper foil  4   a  when no parts are embedded therein. 
         [0121]    Next, as shown in  FIG. 8B , connection members  6   a , heat radiation layers  6  and part mounting regions  20  are formed by selectively removing the second copper foil  6  using an etching solution. In this case, the connection members  6   a  are used as inner via holes. 
         [0122]    When the second copper foil  6  is selectively removed at the time of the etching process thereof, the connection members  6   a  are necessarily formed, but any one of the heat radiation layers  6  and the part mounting regions  20  need not be formed. 
         [0123]    That is, the part mounting regions  20 , as shown in  FIG. 5 , need not be formed when no parts are embedded in the printed circuit board, and the heat radiation layers  6 , as shown in  FIG. 6 , need not be formed when a plurality of parts  22  is embedded in the printed circuit board. 
         [0124]    However, when the parts  22  are embedded in the printed circuit board, it is preferred that both the part mounting regions  20  and the heat radiation layers  6 , as shown in  FIG. 7 , be formed. 
         [0125]    When only the connection members  6   a  and the heat radiation layers  6 , as shown in  FIG. 5 , are formed by selectively removing the second copper foil  6 , an RCC including a second insulation layer  12  and a third copper foil  4   b  is placed on the connection members  6   a  and the heat radiation layers  6 , and then is layered thereon by applying heat and pressure thereto using a press. 
         [0126]    In this case, the second insulation layer  12  and the third copper foil  4   b  may be separately layered. 
         [0127]    That is, the second insulation layer  12  may be layered on the connection members  6   a  and the heat radiation layers  6 , and then the third copper foil  4   b  may be layered on the second insulation layer  12 . 
         [0128]    In this case, the second insulation layer  12  is formed to be thicker than the connection members  6   a  and the heat radiation layers  6 . Further, the heat radiation layers  6  are formed such that widths of the upper surfaces and lower surfaces thereof are greater than those of the upper surfaces and lower surfaces of the connection members  6   a.    
         [0129]    However, when only the connection members  6   a  and the part mounting regions  20 , as shown in  FIG. 6 , are formed by selectively removing the second copper foil  6 , parts  22  are mounted in the part mounting regions  20 , and then an RCC including a second insulation layer  12  and a third copper foil  4   b  is placed on the connection members  6   a  and the heat radiation layers  6  and then is layered thereon by applying heat and pressure thereto using a press. 
         [0130]    In this case, the second insulation layer  12  and the third copper foil  4   b  may be separately layered. 
         [0131]    That is, the second insulation layer  12  may be layered on the connection members  6   a  and the heat radiation layers  6 , and then the third copper foil  4   b  may be layered on the second insulation layer  12 . 
         [0132]    In this case, the second insulation layer  12  is formed to a thickness such that it is capable of filling spaces between the connection members  6   a  and the heat radiation layers  6 . Further, the heat radiation layers  6  are formed such that widths of the upper surface and lower surface thereof are greater than those of the upper surface and lower surface of the connection members  6   a.    
         [0133]    Further, when the connection members  6   a , the heat radiation layers  6  and the part mounting regions  20 , as shown in  FIG. 7 , are formed by selectively removing the second copper foil  6 , as shown in  FIG. 8C , an RCC including a second insulation layer  12  and a third copper foil  4   b , is placed on the connection members  6   a , the heat radiation layers  6  and the parts, and then is layered thereon by applying heat and pressure thereto using a press. 
         [0134]    In this case, the second insulation layer  12  and the third copper foil  4   b  may be separately layered. 
         [0135]    That is, the second insulation layer  12  may be layered on the connection members  6   a  and the heat radiation layers  6 , and then the third copper foil  4   b  may be layered on the second insulation layer  12 . 
         [0136]    In this case, the second insulation layer  12  is formed to a thickness such that it is capable of filling spaces between the connection members  6   a  and the heat radiation layers  6 . Further, the heat radiation layers  6  are formed such that widths of the upper surface and lower surface thereof are greater than those of the upper surface and lower surface of the connection members  6   a.    
         [0137]    After the third copper foil  4   b  is deposited on the second insulation layer  12 , as shown in  FIG. 8D , blind via holes  16  are formed using a laser to connect the first copper foil  4   a  and the third copper foil  4   b  with the connection members  6   a  and the heat radiation layers  6 , and then a copper plating layer is formed in the blind via holes  16 . 
         [0138]    Then, circuit patterns  4   a  and  4   b  are formed through an image forming process. 
         [0139]    As described above, in the method of manufacturing a printed circuit board according to the embodiment of the present invention, various parts having different sizes and thicknesses, such as a bare IC chip, a passive part, a part having a module packed therein, and a module substrate having various components packed therein, can be embedded in the printed circuit board, and the precision of the portion connected with each of the parts can be also increased, because the second copper foil  6  which is as thick as or thicker than each of the parts embedded in the printed circuit board, is selectively removed, the parts are mounted in the portions from which the second copper foil  6  was removed, the second insulation layer  12  is deposited on the parts, and then the via holes are formed, and thus terminals of the parts are connected to the circuit patterns through the via holes. 
         [0140]    Further, in the method of manufacturing a printed circuit board according to the embodiment of the present invention, the connection members  6   a  formed by selectively removing the second copper foil  6  are used as inner via holes, so that an electroless plating process and an electrolytic plating process, which are performed to provide conductivity for the inner via holes passing through the second insulation layer  12 , are not performed, thereby decreasing processing times and processing costs. 
         [0141]    Further, in the method of manufacturing a printed circuit board according to the embodiment of the present invention, the connection members  6   a , which are cylindrical conductors, are used as inner via holes, so that a heat radiation effect in a vertical direction can be improved. Further, the heat radiation layers having large widths are formed in a substrate, so that the heat in the substrate is discharged in vertical and horizontal directions, thereby increasing the heat radiation effect. 
         [0142]    Further, in the method of manufacturing a printed circuit board according to the embodiment of the present invention, a signal interference phenomenon between the parts embedded in the printed circuit board can be reduced, because the parts mounted therein are shielded by the connection members  6   a  and the heat radiation layers  6 . 
         [0143]    AS described above, in the present invention, processing times and processing costs can be reduced, because connection members that use inner via holes are formed by selectively removing a copper foil, and thus the process of forming the inner via holes is not performed. 
         [0144]    Further, in the present invention, various parts having different sizes and thickness, such as a bare IC chip, a passive part, a part having a module packed therein, and a module substrate having various components packed therein, can be embedded in a printed circuit board, and the precision of the connection with each of the parts can be also increased, because the parts are mounted in the portions from which the copper foil was removed, an insulation layer is deposited on the parts, and then via holes are formed, and thus terminals of the parts are connected to circuit patterns. 
         [0145]    Further, in the present invention, inner via holes are formed of cylindrical conductors, so that the heat radiation effect in a vertical direction can be improved. Further, heat radiation layers having large areas are formed in a printed circuit board, so that the heat radiation effect in vertical and horizontal directions can be improved, thereby securing reliability for heat resistance. 
         [0146]    Further, in the present invention, a signal interference phenomenon between parts embedded in a printed circuit board can be reduced, because the parts embedded therein are shielded by connection members and heat radiation layers. 
         [0147]    As described above, although the present invention has been disclosed for illustrative purposes with reference to the preferred embodiments, 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.