Abstract:
An electronic device includes a first housing with a first air inlet and outlet, a heat dissipation assembly, and a filter structure between the first housing and the heat dissipation assembly. The heat dissipation assembly defines a second air inlet and outlet. The first air inlet, the second air inlet, the second air outlet and the first air outlet communicate with each other. The heat dissipation assembly draws air across itself from the two air inlets, and expels the air from the two air outlets. The filter structure covers the second air inlet and defines a plurality of very small holes which function to filter dust out from the incoming air.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present disclosure relates to an electronic device, and particularly to an electronic device having a heat dissipation assembly. 
         [0003]    2. Description of Related Art 
         [0004]    A heat dissipation assembly is a major component of a laptop. The heat dissipation assembly takes heat from the heat generating components, such as CPU, for cooling the heat generating components. The heat dissipation assembly is fixed in a housing with an air inlet and an air outlet. Air enters into the housing through the air inlet, and then comes out from the air outlet, such that the heat generated by the heat generating component can be dissipated. However, dust can enter into the housing with the air from the atmosphere, and the heat dissipation assembly in the housing will be dirty because of the dust. The performance of the heat dissipation assembly will be affected as the dust accumulates. 
         [0005]    Therefore, there is room for improvement within the art. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    Many aspects of the embodiments 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 present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
           [0007]      FIG. 1  is a partial isometric view of an electronic device. 
           [0008]      FIG. 2  is an exploded view of the electronic device in  FIG. 1 , the electronic device including a first housing, a heat dissipation assembly, and a filter structure inserted between the first housing and the heat dissipation assembly. 
           [0009]      FIG. 3  is an isometric view of the first housing of  FIG. 2  viewed from another aspect. 
           [0010]      FIG. 4  is an isometric view of the heat dissipation assembly in  FIG. 2 . 
           [0011]      FIG. 5  is an isometric view of the filter structure in  FIG. 2 . 
           [0012]      FIG. 6  is an exploded view of the filter structure of  FIG. 5  viewed from another aspect. 
           [0013]      FIG. 7  is a cross-sectional view of the electronic device taken along line VII-VII in  FIG. 1 . 
           [0014]      FIG. 8  is a cross-sectional view of the electronic device taken along line VIII-VIII in  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION 
       [0015]      FIGS. 1-3  show an electronic device  100  of an embodiment. The electronic device  100  includes a first housing  10  allowing air to enter and exit the first housing  10 , a heat dissipation assembly  20  fixed in the first housing  10 , and a filter structure  30  detachably inserted between the first housing  10  and the heat dissipation assembly  20 . The heat dissipation assembly  20  attaches to a surface of a heat-generating component, for instance, a CPU (not shown), and dissipates the heat generated by the heat-generating component. The filter structure  30  prevents dust from entering into the heat dissipation assembly  20  with the air. In the embodiment, the electronic device  100  is a laptop. 
         [0016]    The first housing  10  includes a main plate  11 , and a side wall  12  extending from the edge of the main plate  11 . The main plate  11  includes an outer surface  111 , an inner surface  112  opposite to the outer surface  111 , and a first air inlet  113 . The first air inlet  113  defines a number of through holes for allowing air to enter into the first housing  10 . The side wall  12  defines a first air outlet  121  for allowing air to exit from the first housing  10 . 
         [0017]    A first resilience member  13 , a second resilience member  14 , and two rails  15  extend from the inner surface  112 . The two rails  15  symmetrically extend from the inner surface  112  and are adjacent to the first air outlet  121 . The two rails  15  are separated from each other. Each rail  15  includes a horizontal portion  151  and a vertical portion  152  perpendicularly extending from the horizontal portion  151 . The first resilience member  13  and the second resilience member  15  are arched and extend from the inner surface  112 . The first resilience member  13  and the second resilience member  14  are separated along lengths of the two rails  15 . The first resilience member  13  is adjacent to the first air outlet  121 . The second resilience member  14  is distanced from the first air outlet  121 . 
         [0018]    Referring to  FIGS. 4 and 7 , the heat dissipation assembly  20  is fixed on the inner surface  112  of the first housing  10  by screws. A gap  40  is formed between the first housing  10  and the heat dissipation assembly  20 . The heat dissipation assembly  20  includes a second housing  21 , a fan  22  fixed in the second housing  21 , two heat pipes  23 , and a number of heat fins  24  facing the fan  22 . The second housing  21  includes an upper plate  211 , a bottom plate  212  facing the upper plate  211 , and a side wall  213  connected between the upper plate  211  and the bottom plate  212 . The upper plate  211 , the bottom plate  212  and the side wall  213  combine together to form a second air outlet  215 . The bottom plate  212  defines a second air inlet  214  communicating with the second air outlet  215 . An end of the heat pipe  23  is attached to heat generating components (not shown) of the electronic device  100 , while the other end is inserted into the inside of the number of heat fins  24 . The two heat pipes  23  absorb heat from the heat generating components and transfer the heat to the heat fins  24 . The fan  22  runs to introduce the air into the second housing  21  through the second air inlet  214  and discharge the air through the second air outlet  215 , thus the air flow through the heat fins  24  takes away the heat from the heat fins  24 . 
         [0019]    Referring to  FIGS. 5 and 6 , the filter structure  30  is inserted into the gap  40  to be located between the first housing  10  and the heat dissipation assembly  20  through the first air outlet  121 . The filter structure  30  includes a filter screen  31  and an operating member  32  fixed on the filter screen  31 . The filter screen  31  and the operating member  32  are made of plastic material, or metal, or ceramic. 
         [0020]    The filter screen  31  includes an upper surface  311 , a bottom surface  312  opposite to the upper surface  311 , a number of circular vent holes  313 , a flange  314  extending from the edge of the filter screen  31 , a supporting piece  315  formed on the flange  314 , and several fixing columns  316  located on the bottom surface  312 . The vent holes  313  correspond to the second air inlet  214 . All of the vent holes  313  are through holes which are arranged on the respective peripheries of a number of concentric circles. The vent holes are dimensioned and arranged to filter out dust from the air to prevent the dust from entering the heat dissipation assembly  20 . The flange  314  prevents the filter screen  31  from being deformed. The supporting piece  315  corresponds to the second resilience member  14 . The supporting piece  315  includes a first portion  3151  extending obliquely from the flange  314 , and a second portion  3152  extending from the end of the first portion  3151  and facing the bottom surface  312 . The several fixing columns  316  fasten the operating member  32  on the filter screen  31 . In the embodiment, the thickness of the filter screen  31  is from 0.2 mm to 0.4 mm. The diameters of all of the vent holes  313  are equal to or less than 1 mm. In other embodiments, the vent holes  313  may be, but are not limited to, shapes such as triangular or square. 
         [0021]    The operating member  32  includes a fixing portion  321  and an operating portion  322  integrated with the fixing portion  321 . The fixing portion  321  includes a projection  3211  corresponding to the first resilience member  13 , and several fixing holes  3212  corresponding to the several fixing columns  316 . The fixing portion  321  is fixed on the bottom surface  312  of the filter screen  31 . The operating portion  322  defines a concave portion  3221  and a number of grooves  3222 . The concave portion  3221  is defined in the bottom side of the operating portion  322 , thus it is easy for user to remove the filter structure  30  from the gap  40 . The grooves  3222  are defined in the top side of the operating portion  322  facing the first air outlet  121 . When the filter structure  30  is inserted into the gap  40 , the grooves  3222  communicate with the first air outlet  121 , to allow air to exit from the first housing  10 . 
         [0022]    Referring to  FIGS. 7 and 8 , when the filter structure  30  is assembled to the first housing  10 , firstly, the filter structure  30  is inserted into the gap  40  through the first air outlet  121 , and the bottom surface  312  faces the inner surface  112 . Next, the fixing portion  321  slides on the two rails  15  until the operating portion  322  is resisted by the side wall  12 . At this point, the projection  3211  resists against the first resilience member  13 , so as to prevent the filter structure  30  moving out from the gap  40 , due to gravity or vibration in operation. The supporting piece  315  resists the second resilience member  14 , so that the filter screen  31  is tightly held to cover the second air inlet  214  when the heat dissipation assembly  20  is attached, and the vent holes  313  communicate with the second air inlet  214  for the free flow of air. 
         [0023]    When the filter structure  30  is removed from the first housing  10 , the filter structure  30  is pulled out by applying a force to the operating portion  322 , thus the filter structure  30  can be removed. 
         [0024]    As described above, the diameters of the vent holes  313  are small enough to prevent household dust from entering into the second housing  21 . Thus the performance of the heat dissipation assembly  20  will not be affected over time, or as quickly affected. Moreover, the filter screen  30  can be removed from the gap  40 , for cleaning and clearing off any dust which has accumulated on the outside of the filter screen  31 , without disassembling the electronic device  100 . 
         [0025]    Even though relevant information and the advantages of the present embodiments have been set forth in the foregoing description, together with details of the functions of the present embodiments, the disclosure is illustrative only; and changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.