Abstract:
A fastening structure for a shield can is capable of ensuring easy attachment/detachment of the shield can and prevents deformation caused by excessive impact when the shield can is attached and detached by improving the fastening structure for a shield can fixed to a printed circuit board. The fastening structure for a shield can provided to shield a printed circuit board on which electronic components are mounted and the electronic components from electromagnetic waves includes a frame provided with a fixing part allowing the frame to be fixed to the printed circuit board, a shield cover provided to surround an outer side of the frame, fastening parts provided at the shield cover and the frame, respectively, such that the shield cover and the frame are attached/detached to/from each other. The fastening parts and the fixing part are disposed without overlapping each other.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims the benefit of Korean Patent Application No. 10-2014-0020826, filed on Feb. 21, 2014 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. 
       BACKGROUND 
       [0002]    1. Field 
         [0003]    Embodiments of the disclosure relate to a fastening structure for a shield can for shielding electromagnetic waves generated from components or parts mounted on a printed circuit board of various electronic units. 
         [0004]    2. Description of the Related Art 
         [0005]    In general, electronic devices or communication devices may be equipped with various types of contents or components, and a printed circuit board may be provided to electrically connect the contents or components. When such an electronic device or communication device is used, harmful electric waves may be generated from various electronic function groups mounted on the printed circuit board. 
         [0006]    There exists an electromagnetic compatibility (EMC) test to examine whether electromagnetic waves, which is one of the kinds of electric waves which is regulated to determine or ascertain its potential for harmfulness (e.g., to humans), are suitable for an external environment. The EMC has two issues to which it is directed. 
         [0007]    Generally, the two issues are divided into analyzing electromagnetic interference (EMI) and analyzing electromagnetic susceptibility (EMS), such that electromagnetic waves are strictly regulated for its harmfulness to humans. 
         [0008]    According to such strict regulation according to the EMC test, various units (devices) or methods have been suggested to prevent electromagnetic waves. 
         [0009]    For example, in order to shield electromagnetic waves generated from various devices on a printed circuit board used for a mobile terminal, a method of coating paint through an EMI spray or a vacuum deposition, or a method of mounting a shield can on a printed circuit board have been suggested. 
         [0010]    The above methods may be used in a combined manner, but the shield can generally used in most applications. In particular, various methods of mounting a shield can on a printed circuit board have been provided and classified into a mechanical coupling method, a clip type coupling method and a frame type coupling method. 
       SUMMARY 
       [0011]    Therefore, it is an aspect of the disclosure to provide a fastening structure for a shield can, capable of ensuring easy attachment/detachment of the shield can by improving the fastening structure for a shield can fixed to a printed circuit board. 
         [0012]    It is another aspect of the disclosure to provide a fastening structure for a shield can, capable of achieving slimness by minimizing the height of a shield can. 
         [0013]    It is another aspect of the disclosure to provide a fastening structure for a shield can, capable of improving shielding characteristics. 
         [0014]    It is another aspect of the disclosure to provide a fastening structure for a shield can, capable of preventing deformation caused by excessive impact when a shield can is attached and detached. 
         [0015]    Additional aspects of the disclosure will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the disclosure. 
         [0016]    In accordance with an aspect of the disclosure, a fastening structure for a shield can may be provided to shield a printed circuit board on which electronic components are mounted and the electronic components from electromagnetic waves. The fastening structure may include: a frame provided with a fixing part allowing the frame to be fixed to the printed circuit board, a shield cover provided to surround an outer side of the frame, and fastening parts provided at the shield cover and the frame, respectively, such that the shield cover and the frame are attached/detached to/from each other. The fastening parts and the fixing part may be disposed without overlapping each other. 
         [0017]    The fastening parts may include: a first fastening part provided on the frame, and a second fastening part provided on the shield cover while corresponding to the first fastening part. 
         [0018]    The frame may include an upper surface, and a frame lateral side part bent downward from an edge of the upper surface, wherein the fixing part may be formed at a lower end of the frame lateral side part. 
         [0019]    The first fastening part and the fixing part may be alternately disposed at the frame lateral side part. 
         [0020]    The first fastening part may have a height which is smaller than a height of the fixing part at the frame lateral side part. 
         [0021]    The fixing part may include at least one of a soldering fastening, a bonding fastening, a clip fastening and a screw fastening. 
         [0022]    The first fastening part may include a fastening groove that is depressed from the frame lateral side part. 
         [0023]    The fastening groove may include at least one of a circle, a semicircle, and an ellipse. 
         [0024]    The fastening groove may include a slit part formed by slitting at least one portion of a lower end of the fastening groove. 
         [0025]    The shield cover may include: a shield cover surface, and a shield cover lateral side part bent downward from an edge of the shied cover surface, wherein a plurality of slots may be formed by slitting the shield cover lateral side part downward. 
         [0026]    The second fastening part may include a fastening protrusion formed at the shield cover lateral side part in a shape corresponding to the fastening groove. 
         [0027]    The second fastening part may have a height which is larger than a height of the shield cover lateral side part. 
         [0028]    The second fastening part may have a height equal to or smaller than a height of the fixing part. 
         [0029]    In accordance with an aspect of the disclosure, a fastening structure for a shield can may be provided to shield a printed circuit board on which electronic components are mounted and the electronic components from electromagnetic waves. The fastening structure may include: a frame provided with a fixing part allowing the frame to be fixed to the printed circuit board, a shield cover provided at the shield can to surround an outer side of the frame, and fastening parts provided at the shield cover and the frame, respectively, such that the shield cover and the frame are attached/detached to/from each other. The fastening part and the fixing part may be disposed without overlapping each other, and the fastening parts may have a height equal to or smaller than a height of the fixing part. 
         [0030]    The fasting parts may include a first fastening part provided on a lateral side of the frame, and a second fastening part provided on the shield cover while corresponding to the first fastening part. 
         [0031]    The first fastening part may have a height smaller than a height of the fixing part at the frame. 
         [0032]    The first fastening part may include a fastening groove that is depressed from the lateral side of the frame. 
         [0033]    The fastening groove may include at least one of a circle, a semicircle, and an ellipse. 
         [0034]    The fastening groove may include a slit part formed by slitting at least one portion of a lower end of the fastening groove. 
         [0035]    The second fastening part may include a fastening protrusion formed in a shape corresponding to the fastening groove. 
         [0036]    In accordance with an aspect of the disclosure, a printed circuit board may include at least one electronic component mounted on the printed circuit board and a shield can disposed to cover at least a portion of the at least one electronic component to shield electromagnetic waves generated by the at least one electronic component. The shield can may include a frame including a fixing part to fix the frame to the printed circuit board, a shield cover disposed to surround an outer side of the frame, and fastening parts disposed at the shield cover and the frame, respectively, such that the shield cover and the frame are attachable to each other and detachable from each other. The fastening parts may have a height which is equal to or smaller than a height of the fixing part. 
         [0037]    The frame may include an upper surface, a frame lateral side part bent downward from an edge of the upper surface, and a plurality of fixing parts are disposed at intervals along a lower portion of the frame lateral side part. The shield cover may include a shield cover surface, a shield cover lateral side part bent downward from an edge of the shield cover surface, and a plurality of slots formed by slitting the shield cover lateral side part downward. 
         [0038]    The fastening parts may include a plurality of first fastening parts disposed at intervals along the lower portion of the frame lateral side part, and between adjacent fixing parts, and a plurality of second fastening parts disposed at intervals along the shield cover lateral side part to correspond to the plurality of first fastening parts. 
         [0039]    The plurality of first fastening parts may include grooves which protrude toward an inside of the frame, and the plurality of second fastening parts may include protrusions which protrude outward from an inside of the shield cover lateral side part to be fastened to the corresponding grooves. 
         [0040]    The height of the fixing parts may be greater than a height of the shield cover lateral side part. 
         [0041]    As described above, the shield can may be easily attached and detached, and deformation caused by excessive shock when a shield can is attached and detached may be prevented by improving the fastening structure of the shield can fixed to the printed circuit board. 
         [0042]    Slimness is achieved by minimizing the height of the shield can. 
         [0043]    Electromagnetic waves shielding characteristics are improved. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0044]    These and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
           [0045]      FIG. 1  is a perspective view schematically illustrating a printed circuit board on which a shield can is mounted in accordance with an embodiment of the disclosure. 
           [0046]      FIG. 2  is an exploded perspective view illustrating a shield can mounted on a printed circuit board in accordance with an embodiment of the disclosure. 
           [0047]      FIG. 3  is an exploded perspective view illustrating a fastening structure for a shield can in accordance with the embodiment of the disclosure. 
           [0048]      FIG. 4  is a schematic view illustrating a frame of a fastening structure for a shield can in accordance with an embodiment of the disclosure. 
           [0049]      FIG. 5  is a schematic view illustrating a shield cover in accordance with an embodiment of the disclosure. 
           [0050]      FIG. 6  is a side view illustrating a frame coupled to a shield cover in accordance with an embodiment of the disclosure. 
           [0051]      FIG. 7  is a cross sectional view taken along line A-A′ of  FIG. 6   
       
    
    
     DETAILED DESCRIPTION 
       [0052]    Reference will now be made in detail to the embodiments of the disclosure, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. 
         [0053]      FIG. 1  is a perspective view schematically illustrating a printed circuit board on which a shield can is mounted in accordance with an embodiment of the disclosure,  FIG. 2  is an exploded perspective view illustrating a shield can mounted on a printed circuit board in accordance with an embodiment of the disclosure, and  FIG. 3  is an exploded perspective view illustrating a fastening structure for a shield can in accordance with the embodiment of the disclosure. 
         [0054]    Referring to  FIGS. 1 to 3 , various electronic components (electronic function groups)  3 , such as a semiconductor device, may be mounted on a printed circuit board  1 , and a shield can  2  may be provided at an outer side of the electronic components  3  to cover an outer side of the electronic components  3  to shield electromagnetic interference generated from the electronic components  3 . 
         [0055]    The shield can  2  may include a frame  10  fixed to the printed circuit board  1 , and a shield cover  20  configured to surround an outer side of the frame  10 . 
         [0056]    Through a shield can fastening structure with respect to the frame  10 , the shield cover  20  may be provided so as to be attached/detached to/from the printed circuit board  1 . 
         [0057]    The shield can  2  may be provided to cover an upper surface of the electronic components  3  mounted on the printed circuit board  1 , and may be formed of a conductive material to shield noise. 
         [0058]    The frame  10  and the shield cover  20  may be provided with fastening parts  50 , respectively, for mutual attachment/detachment. 
         [0059]    The fastening parts  50  may include a first fastening part  30  provided at a lateral side of the frame  10 , and a second fastening part  40  provided on the shield cover  20 . 
         [0060]    The second fastening part  40  may be formed at a position corresponding to a position of the first fastening part  30 . 
         [0061]    The frame  10  may include a fixing part  13  allowing the frame  10  to be fixed to the printed circuit board  1 . 
         [0062]    The fixing part  13  may include a plurality of fixing parts  13  being spaced apart from each other by a predetermined interval at a lower end of the lateral side of the frame  10 . Although the fixing part  13  may be implemented through soldering, the disclosure is not limited thereto and may be implemented in various methods as long as the fixing part is able to fix the frame to the printed circuit board. For example, the fixing part  13  may enable the frame  10  to be fixed to the printed circuit board  1 , by for example, bonding, clip or screw fastening, and the like. For example, generally a fastening member may include a screw, a bolt, a pin, a clip, a rivet, an anchor, an adhesive, and the like. The plurality of fixing parts may be spaced apart from each other by a regular interval such that the plurality of fixing parts may be spaced apart from one another by a equal distance. The plurality of fixing parts may be spaced apart from each other by irregular intervals such that at least some of the plurality of fixing parts may be spaced apart from one another by different distances. A width of each of the fixing parts on one or more sides of the frame may be the same as one another, or may be different from one another. Likewise, a width of each of the first fastening parts on one or more sides of the frame may be the same as one another, or may be different from one another. 
         [0063]    The fastening parts  50  provided on the frame  10  and the shield cover  20  may be disposed without overlapping with the fixing part  13  of the frame  10 , to prevent the frame  10  from interfering with the shield cover  20  at the time of fastening for attachment/detachment of the frame  10  and the shield cover  20  and at the time of fixing the shield can to the printed circuit board  10 . 
         [0064]    Although the fastening parts  50  configured to fasten the shield cover  20  and the frame  10  to each other are illustrated as being formed to include a total of eight fastening parts  50  at one side of the shield can  2  having a square shape, the disclosure is not limited thereto. For example, the fastening parts may be provided in various sizes and number depending on the size and shape of the shield can. For example, there may be less than eight fastening parts or more than eight fastening parts. The number of fastening parts (as well as the size of the shield can) may be determined by the size of the printed circuit board, by the number of electrical components to be shielded, etc. The width of the fastening parts may also determine how many fastening parts may be arranged on any one side of the frame and/or shield cover. The shield can and/or frame may have a square shape, rectangular shape, circular shape, oval shape, or generally any polygonal or geometric shape, which may be used to cover a portion or all of the electrical components on the printed circuit board. There may be a plurality of shield cans and corresponding frames arranged or disposed on the printed circuit board to cover a plurality of groups of electrical components. 
         [0065]      FIG. 4  is a schematic view illustrating a frame of a fastening structure for a shield can in accordance with an embodiment of the disclosure,  FIG. 5  is a schematic view illustrating a shield cover in accordance with an embodiment of the disclosure  FIG. 6  is a side view illustrating a frame coupled to a shield cover in accordance with an embodiment of the disclosure, and  FIG. 7  is a cross sectional view taken along line A-A′ of  FIG. 6 . 
         [0066]    Referring to  FIGS. 4 to 7 , the frame  10  fixed to the printed circuit board  1  may be disposed at an outside of the electronic components  3  such that the shield can  2  surrounds the outer side of the electronic components  3 . 
         [0067]    The frame  10  may include an upper surface  11 , frame lateral side parts  12  bent downward from edges of the upper surface  11 , and a plurality of first fastening parts  30  formed at the frame lateral side part  12 . 
         [0068]    The first fastening part  30  may include a fastening groove  31  formed at the frame lateral side part  12 . The fastening groove  31  may protrude toward inside of the frame  10 . 
         [0069]    The fastening groove  31  may be provided in the shape of at least one of a circle, a semicircle, and an ellipse. However, the disclosure is not so limited, and the fastening groove may be shaped differently, for example, in a square shape, rectangular shape, etc. 
         [0070]    The fastening groove  31  may include a slit part  32  that is formed by slitting at least one portion of a lower end of the fastening groove  31 . The slit part  32  may be formed at the lower end of the fastening groove  31 , and the fastening groove  31  may have a height h 1  which is smaller than a height h 2  of the fixing part  13  of the frame  10  due to the slit part  32 . 
         [0071]    The shield cover  20  may include a shield cover surface  20   a , shield cover lateral side parts  21  bent downward from edges of the shield cover surface  20   a , a plurality of slots  22  disposed between the shield cover lateral side parts  21  while being spaced apart from each other, and a second fastening part  40  formed in the middle or central portion of the shield cover lateral side part  21 . 
         [0072]    The slot  22  may be formed by vertically slitting the shield cover lateral side part  21  from a lower end of the shield cover lateral side part  21  to a periphery of the shield can  2 , and may include a plurality of slots  22  being spaced apart from each other by a predetermined interval. The plurality of slots may be spaced apart from each other by a regular interval such that the plurality of slots may be spaced apart from one another by a equal distance. The plurality of slots may be spaced apart from each other by irregular intervals such that at least some of the plurality of slots may be spaced apart from one another by different distances. Likewise, a width of each of the shield cover later side parts on one or more sides of the shield cover may be the same as one another, or may be different from one another. Likewise, a width of each of the second fastening parts on one or more sides of the shield cover may be the same as one another, or may be different from one another. 
         [0073]    The second fastening part  40  may be formed at a position corresponding to the first fastening part  30  of the frame  10 . 
         [0074]    The second fastening part  40  may include a fastening protrusion  41  protruding inward from the shield cover lateral side part  21  (i.e., protruding inward toward the frame by protruding outward from an inside or interior surface of the shield cover lateral side part  21  as shown in  FIG. 6  and  FIG. 7 , for example) so as to correspond to the first fastening part  30 . 
         [0075]    Accordingly, the fastening protrusion  41  may be provided in the form of at least one of a circle, a semicircle, and an ellipse so as to correspond to the fastening groove  31 . However, the disclosure is not so limited, and the fastening protrusion may be shaped differently, for example, in a square shape, rectangular shape, etc., so as to correspond to a shape of the fastening groove. 
         [0076]    Meanwhile, the second fastening part  40  may have a height h 3  which is larger than a height h 4  of the shield cover lateral side part  21 , and which is equal to or smaller than the height h 2  of the fixing part  13  of the frame  10 . 
         [0077]    As described above, the height h 3  of the second fastening part  40  of the shield cover  20  may be formed to be smaller than the height h 2  of the fixing part  13  of the frame  10 , and to be larger than the height h 4  of the shield cover lateral side part  21  of the shield cover  20 , so that the overall height of the shield can  2  mounted on the printed circuit board  1  is reduced, thereby achieving slimness. 
         [0078]    Meanwhile, as the fastening protrusion  41  of the shield cover  20  is inserted into the fastening groove  31  of the frame  10 , the frame  10  is fastened to the shield cover  20 . 
         [0079]    For example, since the first fastening part  30  is provided with the slit part  32  formed at the lower portion of the fastening groove  31 , the fastening protrusion  41  of the second fastening part  40  may be easily separated from the fastening groove  31 . 
         [0080]    When the frame  10  is coupled to the shield cover  20 , the height h 4  of the shield cover lateral side part  21  of the shield cover  20  and the height h 1  of the fastening groove  31  may be provided at the same level. Also, when the frame  10  is coupled to the shield cover  20 , the height h 3  of the second fastening part  40  of the shield cover  20  and the height h 2  of the fixing part  13  of the frame  10  may be provided at the same or substantially the same level. Accordingly, when the shield can is bonded (or fixed, coupled, adhered to, etc.) to the printed circuit board  1 , a gap or space between the shield cover  20  and the printed circuit board  1  may be minimized. 
         [0081]    As shown in  FIG. 4 , a first fastening part  30  may include a fastening groove and slit part, and as shown in  FIG. 5 , a second fastening part  40  may include a fastening protrusion which is disposed so as to correspond to the fastening groove and slit part of the first fastening part  30 . Fastening grooves and slit parts may be arranged or disposed on every first fastening part or only on some of the first fastening parts (e.g., every other first fastening part). Likewise, fastening protrusions may be arranged or disposed on every second fastening part or only on some of the second fastening parts (e.g., every other second fastening part). 
         [0082]    Although embodiments of the disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents.