Patent Publication Number: US-2015077932-A1

Title: Shielding assembly and electronic device

Description:
BACKGROUND 
     1. Technical Field 
     The disclosure generally relates to shielding assemblies, and particularly to shielding assemblies used in electronic devices. 
     2. Description of Related Art 
     Electromagnetic interference (EMI) occurs between neighboring electronic components or circuits due to inductive couplings. To avoid the occurrence of EMI, shielding structures are commonly employed to absorb as much EMI radiation energy as possible for the electronic components or the circuits. Take central processor units (CPU) as an example; to reduce the EMI of the CPU, one way is to embed the CPU into a motherboard and partially shield the CPU with the motherboard. However, in this situation, when CPU frequency is increased, the EMI of the CPU becomes strong and may still interfere other electronic components. Alternatively, an extra shield may be employed to completely cover most portions of the motherboard. However, the extra shield may increase a volume of the electronic device. 
     Therefore, there is room for improvement within the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the disclosure. 
         FIG. 1  is an exploded view of an electronic device including a shielding assembly, according to an exemplary embodiment of the disclosure. 
         FIG. 2  is a partially assembled view of the electronic device shown in  FIG. 1 . 
         FIG. 3  is an assembled view of the electronic device shown in  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a schematic view of an electronic device including a shielding assembly, according to an exemplary embodiment of the disclosure. The electronic device further includes a motherboard  10  and a central processor unit (CPU)  20  positioned on the motherboard  10 . The motherboard  10  includes a first surface  11  and a second surface  12  opposite to the first surface  11 . The first surface  11  and the second surface  12  are coated with an insulating layer which may be formed by epoxy resin. The CPU  20  is positioned on the first surface  11 . 
     The shielding assembly includes a shielding plate  16 , a heat dissipating module  25 , and a shielding frame  30 . The shielding plate  16  is secured to the second surface  12  opposite to the CPU  20  so that the CPU  20  is completely shielded. The shielding frame  30  is positioned on the first surface  11  and surrounds the CPU  20 . The heat dissipating module  25  covers on the shielding frame  30  to form a shielding space. The CPU  20  is received in the shielding space. In other embodiment, the CPU  20  may be other electronic element of the electronic device which needs to be shielded. 
     The heat dissipating module  25  includes a metallic base  251 , a plurality of heat sinks  253  positioned on a surface of the base  251 , and a plurality of fastening assemblies  26  configured to fasten the base  251  to the shielding frame  30 . A first latching hole  254  is defined at each corner of the base  251 . In this embodiment, there are one fastening assembly  26  corresponding to each first latching holes  254 . Each fastening assembly  26  includes a fixing plate  261 , a latching plate  262  hinged to the fixing plate  261 , a latching bolt  263  and an elastic member  269 . A latching block  266  protrudes from an end of the fixing plate  261  facing the latching plate  262 . A through hole  265  is defined in the latching plate  262 . In this embodiment, the through hole  265  is substantially cross-shaped. The latching plate  262  is fixed to the base  251  by the latching bolt  263  via the through hole  265 . The latching block  266  is latched to the shielding frame  33 . The latching bolt  263  includes a head portion  267  and a tail portion  268 . The head portion  267  is substantially a cross-shaped protrusion configured to extend through the through hole  265 , the first latching hole  254  and engage in the shielding frame  30 . The tail portion  268  is a plate configured for a user to conveniently rotating the latching bolt  263 . The elastic member  269  is a spring sleeved around the latching bolt  263  and positioned between the head portion  267  and the tail portion  268 . The elastic member  269  is compressed when the head portion  267  engages in the shielding frame  30  and released when the head portion  267  disengages with the shielding frame  30  to provide elastic force to push out the latching bolt  263  from the corresponding first latching hole  254  and through hole  265 . 
     The shielding frame  30  is metallic and substantially rectangular. The shielding frame  30  includes a bottom wall  31  and a side wall  33  protruding from a peripheral edge of the bottom wall  31 . The bottom wall  31  defines a through slot  311  so that the shielding frame  30  forms a frame structure. Two opposite top walls  331  extend from the side wall  33  and are parallel to the bottom wall  31 . A plurality of second latching holes  332  are defined in the top walls  331  corresponding to the first latching holes  254  and configured for assembling of the heat dissipating module  25  to the shielding frame  30 . A plurality of latching slots  333  are defined in an outer surface of the side wall  31  and configured to engage with the latching blocks  266 . 
     To assemble the shielding assembly to the electronic device, the shielding frame  30  is assembled to the motherboard  10  by fixing the bottom wall  31  on the first surface  11 . The CPU  20  is received in the through slot  311  and surrounded by the shielding frame  30 . The base  251  is position on the top walls  331  with the first latching holes  254  aligning with the second latching holes  332 . The latching plates  262  is positioned on the base  251  with the through holes  265  aligning with the first latching holes  254  and the second latching holes  332 . The latching bolts  263  extend through the through holes  265  and the first latching holes  254  and engage in the second latching holes  332  by rotating the latching bolts  263  so that the heat dissipating module  25  is latched to the shielding frame  30  via the fastening assemblies  26 . The shielding plate  16  is fixed to the second surface  12  corresponding to the shielding frame  30  to completely shield the CPU  20 . 
     To disassemble the shielding assembly from the electronic device, the tail portions  263  are manually rotated to make the head portions  267  disengage from the second latching holes  332  so that the elastic members  269  push the latching bolts  269  out from the first latching holes  254  and the through holes  265 . The heat dissipating module  25  can be detached from the shielding frame  33  without any tools. 
     In other embodiment, the fastening assemblies  26  may be bolts or rivets which directly extend through the first latching holes  254  and the corresponding second latching holes  332  to fasten the base  251  to the shielding frame  30 . 
     In other embodiments, the latching plate  262  can be directly fixed to the fixing plate  261 . 
     The shielding assembly uses the heat dissipating module  25 , the shielding frame  30 , and the shielding plate  16  to corporately and completely shield the CPU  20  that space is saved on the motherboard  10  and also effectively shield the CPU  20  from other electronic elements of the motherboard  10 . 
     It is believed that the exemplary embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the disclosure or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the disclosure.