Abstract:
Disclosed are a printed circuit board and an electronic component package having the printed circuit board, which includes: a base board; a heat-dissipating pad formed on the based board and having an electronic component installed thereon; and a bridging pad formed on the base board between the heat-dissipating pad and a shield can installed on the base board so as to allow heat generated by the electronic component to be transferred from the heat-dissipating pad to the shield can.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2014-0129313, filed with the Korean Intellectual Property Office on Sep. 26, 2014, the disclosure of which is incorporated herein by reference in its entirety. 
       BACKGROUND 
       [0002]    1. Technical Field 
         [0003]    The present invention relates to a printed circuit board and an electronic component package having the same. 
         [0004]    2. Background Art 
         [0005]    The integrated circuit technology has been continuously improving, and accordingly the chips have become increasingly smaller. Moreover, various electronic devices have been designed in smaller sizes. 
         [0006]    Chips are a heat source and thus generate heat during the operation. There has been an increasing quantity of chips installed in the substrate, resulting in an increase of heat density. Accordingly, without a proper heat dissipation, the heat may adversely affect the chips and cause a malfunction of the chips. 
         [0007]    While vias or the like may be used for dissipating the heat generated by the chips, this may cause an unnecessary discharge of solders through the vias. Moreover, dissipating the heat through the vias is not very efficient. 
         [0008]    The related art of the present invention is disclosed in Korean Patent Publication No. 10-2014-0078547 (laid open on Jun. 25, 2014; CHIP THERMAL DISSIPATION STRUCTURE). 
       SUMMARY 
       [0009]    The present invention provides a printed circuit board and an electronic component package that may discharge heat generated by the electronic component to a shield can. 
         [0010]    An aspect of the present invention provides an electronic component package that may discharge heat generated by an electronic component to a shield can, by forming a bridging pad between a heat-dissipating pad and the shield can. 
         [0011]    The electronic component package may include: a base board; a heat-dissipating pad formed on the base board; an electronic component installed on the heat-dissipating pad; a shield can installed on the base board so as to cover the electronic component; and a bridging pad formed on the base board between the heat-dissipating pad and the shield can so as to allow heat generated by the electronic component to be transferred from the heat-dissipating pad to the shield can. 
         [0012]    One end of the bridging pad may be in contact with the heat-dissipating pad, and the other end thereof may be in contact with an inside surface of the shield can. 
         [0013]    The bridging pad may be formed as a straight line from the heat-dissipating pad toward the shield can. 
         [0014]    The electronic component package may further include a solder resist formed on the base board in such a way that at least a portion of the bridging pad is exposed. 
         [0015]    The electronic component may be installed on the bridging pad. Moreover, a solder for allowing the electronic component to be installed may be formed at the exposed portion of the bridging pad. 
         [0016]    The solder resist may cover a portion of the bridging pad that is adjacent to the shield can, and the solder resist may cover a portion of the bridging pad that is adjacent to the heat-dissipating pad. 
         [0017]    The electronic component package may further include a connection pad formed around the heat-dissipating pad on the base board so as to be connected with the electronic component. 
         [0018]    The bridging pad may be grounded to the shield can. 
         [0019]    Another aspect of the present invention provides a printed circuit board having a bridging pad formed between a heat-dissipating pad and a shield can so as to allow heat generated by an electronic component to be discharged to the shield can. 
         [0020]    The printed circuit board may include: a base board; a heat-dissipating pad formed on the based board and having an electronic component installed thereon; and a bridging pad formed on the base board between the heat-dissipating pad and a shield can installed on the base board so as to allow heat generated by the electronic component to be transferred from the heat-dissipating pad to the shield can. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0021]      FIG. 1  shows an electronic component package in accordance with an embodiment of the present invention. 
           [0022]      FIG. 2  shows an inside of the electronic component package in accordance with an embodiment of the present invention. 
           [0023]      FIG. 3  shows a printed circuit board in accordance with an embodiment of the present invention. 
           [0024]      FIG. 4  shows the printed circuit board and a pad in accordance with an embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0025]    Hereinafter, a printed circuit board and an electronic component package having the same in accordance with the present invention will be described with reference to the accompanying drawings. In describing the present invention with reference to the accompanying drawings, any identical or corresponding elements will be assigned with same reference numerals, and their description will not be provided redundantly. 
         [0026]    Terms such as “first” and “second” may be used in describing various elements, but the above elements shall not be restricted to the above terms. The above terms are used only to distinguish one element from the other. 
         [0027]    When one element is described to be “coupled” to another element, it does not refer to a physical, direct contact between these elements only, but it shall also include the possibility of yet another element being interposed between these elements and each of these elements being in contact with said yet another element. 
         [0028]      FIG. 1  shows an electronic component package in accordance with an embodiment of the present invention.  FIG. 2  shows an inside of the electronic component package in accordance with an embodiment of the present invention.  FIG. 3  shows a printed circuit board in accordance with an embodiment of the present invention.  FIG. 4  shows the printed circuit board and a pad in accordance with an embodiment of the present invention. 
         [0029]    Referring to  FIG. 1  to  FIG. 4 , the printed circuit board in accordance with an embodiment of the present invention may include a base board  110 , a heat-dissipating pad  120 , a connection pad  121 , a bridging pad  140  and a solder resist  150 . 
         [0030]    Moreover, the electronic component package in accordance with an embodiment of the present invention may include an electronic component  10 , the base board  110 , the heat-dissipating pad  120 , the connection pad  121 , a shield can  130 , the bridging pad  140  and the solder resist  150 . 
         [0031]    The electronic component  10  may include components such as an active device and a passive device and may be, for example, an integrated circuit chip. Heat is generated from the electronic component  10  when the electronic component  10  operates. 
         [0032]    The base board  110  is a board including an insulation layer and a circuit  111 . Here, the insulation layer may be an insulation material such as prepreg and may have glass fiber inserted therein, as necessary, for enhancement of rigidity. The circuit  111  is wiring formed on one surface or both surfaces of the insulation layer and may be formed with a metal such as copper. 
         [0033]    The heat-dissipating pad  120  is formed on the base board  110  and functions to dissipate the heat generated by the electronic component  10 . The heat-dissipating pad  120  is formed in an area for installing the electronic component  10 . Specifically, the electronic component  10  is installed on one surface of the heat-dissipating pad  120 . The heat-dissipating pad  120  may have a greater area than other pads in order to increase a heat-dissipating efficiency of the electronic component  10 . 
         [0034]    The connection pad  121  is electrically connected with the circuit  111  and has a chip connected thereto. The connection pad  121  may be arranged around the heat-dissipating pad  120  and formed beneath an area for installing the chip. 
         [0035]    The shield can  130  covers the electronic component  10  to shield electromagnetic waves. As shown in  FIG. 1 , the shield can  130  may have a cuboidal shape and may have a receiving space therein. Received in the receiving space of the shield can  130  is the electronic component  10 . The shield can  130  may be made of a conductive material such as a metal. 
         [0036]    The bridging pad  140  is formed between the heat-dissipating pad  130  and the shield can  130  on the base board  110  so that the heat generated by the electronic component  10  may be transferred from the heat-dissipating pad  120  to the shield can  130 . 
         [0037]    At least a portion of the bridging pad  140  may be covered by the electronic component  10 . That is, the electronic component  10  may be installed on the bridging pad  140 . 
         [0038]    The bridging pad  140  may be formed to be extended from the heat-dissipating pad  120  toward the shield can  130  and may be provided in plurality around the heat-dissipating pad  120 . In other words, the bridging pad  140  may be formed radially about the heat-dissipating pad  120 . 
         [0039]    One end of the bridging pad  140  may be in contact with the heat-dissipating pad  120 , and the other end thereof may be in contact with an inside surface of the shield can  130 . In such a case, the bridging pad  140  may be formed with a shortest distance from the heat-dissipating pad  120  to the shield can  130 . In other words, the bridging pad  140  may be formed as a straight line from the heat-dissipating pad  120  toward the shield can  130 . Accordingly, the heat may be transferred quickly from the heat-dissipating pad  120  to the shield can  130 . 
         [0040]    The bridging pad  140  may be grounded to the shield can  130 . That is, the bridging pad  140  may simultaneously discharge static electricity generated inside the electronic component  10  while dissipating the heat from the electronic component  10 . 
         [0041]    The connection pad  121  may be extended in parallel with the bridging pad  140 . In such a case, the connection pad  121  may be shorter than the bridging pad  140  and may be formed to be separated from the heat-dissipating pad  120  and the shield can  130 . 
         [0042]    The circuit  111 , the connection pad  121  and the bridging pad  140  may be all formed simultaneously. For example, the circuit  111 , the connection pad  121  and the bridging pad  140  may be formed simultaneously through a photolithography process. 
         [0043]    The solder resist  150  covers the circuit  111  in order to protect the circuit  111 . The solder resist  150  does not cover the heat-dissipating pad  120 . In other words, the heat-dissipating pad  120  is exposed. Moreover, the solder resist  150  exposes at least a portion of the bridging pad  140 . Formed where the heat-dissipating pad  120  and the bridging pad  140  are exposed is a solder, by which the chip may be installed. 
         [0044]    That is, the solder resist  150  covers portions of the bridging pad  140  other than a portion where the solder is formed, and this is to prevent the solder from being formed at unnecessary portions other than the area for installing the electronic component  10 . 
         [0045]    In such a case, a portion of the bridging pad  140  that is adjacent to the shield can  130  may be covered by the solder resist  150 . That is, as illustrated in  FIG. 2  and  FIG. 3 , in the electronic component package formed with the solder resist  150 , the bridging pad  140  appears visually as if a middle portion thereof is disconnected from the shield can  130  by the solder resist  150 . 
         [0046]    Moreover, a portion of the bridging pad  140  that is adjacent to the heat-dissipating pad  120  may be covered by the solder resist  150 . Likewise, the bridging pad  140  appears visually as if a middle portion thereof is disconnected from the heat-dissipating pad  120  by the solder resist  150 . 
         [0047]    As described above, with the printed circuit board and the electronic component package including the printed circuit board in accordance with an embodiment of the present invention, the heat generated by the electronic component may be transferred to the shield can by the bridging pad, thereby enabling an efficient dissipation of the heat. 
         [0048]    Although a certain embodiment of the present invention has been described above, it shall be appreciated that there can be a variety of permutations and modifications of the present invention by those who are ordinarily skilled in the art to which the present invention pertains without departing from the technical ideas and scope of the present invention, which shall be defined by the appended claims. It shall be also appreciated that a large number of other embodiments than the above-described embodiment are included in the claims of the present invention.