Abstract:
An enclosure includes a sidewall defining a number of first vents and a shield apparatus installed to the sidewall. The shield apparatus includes a shield plate spaced from the sidewall. A distance between the sidewall and the shield plate is greater than a size of the first vent. The shield plate defines a number of second vents respectively aligning with the first vents.

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to enclosures and, particularly, to an enclosure with a shield apparatus. 
     2. Description of Related Art 
     In an electronic device, such as a server or a computer, electromagnetic interference (EMI) is a common problem during operation of the electronic device. Commonly, a plurality of vents is defined in the enclosure for heat dissipation, and the sizes and placement of the vents are chosen and arranged to help avoid EMI. However, the vents with small sizes are not circulative enough to dissipate the heat of the enclosure, while the vents with large sizes are not shielding enough to avoid EMI. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the present 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, all the views are schematic, and like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is an exploded, isometric view of a first embodiment of an enclosure, wherein the enclosure includes a shield apparatus. 
         FIG. 2  is an assembled, isometric view of  FIG. 1 . 
         FIG. 3  is a cross-sectional view of  FIG. 2 , taken along the line of III-III. 
         FIG. 4  is a graph showing electromagnetic interference shielding effectiveness of a conventional enclosure and the enclosure using the shield apparatus of  FIG. 1 . 
         FIG. 5  is an isometric view of a second embodiment of an enclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The disclosure, including the accompanying drawings, is illustrated by way of examples and not by way of limitation. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at least one. 
     Referring to  FIG. 1  and  FIG. 2 , a first embodiment of an enclosure  100  of an electronic device includes a rectangular sidewall  20  and a shield apparatus  40  located above the sidewall  20 . The sidewall  20  and the shield apparatus  40  are integrally formed and coplanar with each other. 
     The sidewall  20  defines a plurality of first vents  22 , and a plurality of fastening holes  24  below the first vents  22 . The shield apparatus  40  defines a plurality of second vents  44 . A plurality of pieces  46  protrudes out from a top side of the shield apparatus  40  away from the enclosure  100 . Two parallel first bending lines X 1  and X 2  are formed between the first vents  22  and the second vents  44 , and a second bending line X 3  is formed above the second vents  44  and below the pieces  46 . A distance between the first bending lines X 1  and X 2  is greater than the side length of the first vent  22 . In the embodiment, each first vent  22  is square, each second vent  44  is square, a side length of the first vent  22  is equal to a side length of the second vent  44 , and the side length of each first and second vent  22  and  44  is about 4 millimeters (mm) to about 8 mm. 
     In assembly, the shield apparatus  40  is perpendicularly bent along the first and second bending lines X 1 , X 2 , and X 3 , the pieces  46  are respectively latched into the fastening holes  24 , and the second vents  44  are respectively aligned with the first vents  22 . The sidewall  20  and the shield apparatus  40  cooperatively bound a shield space  48 . In the embodiment, the distance between the sidewall  20  and the shield plate  42  is about 10 mm. 
     Referring to  FIG. 3 , when the electronic device operates, heat and electromagnetic radiation are generated by the electronic device. The heat is dissipated out of the enclosure  100  through the second vents  44  and the first vents  22 . Some of the electromagnetic radiation extends through the second vents  44 , and is reflected back by the sidewall  20  for preventing the electromagnetic radiations from leaking out of the enclosure  100 . 
     Referring to  FIG. 4 , a curve A 1  represents electromagnetic interference (EMI) shielding effectiveness of a conventional enclosure, and the size of each vent of the conventional enclosure is 6 mm*6 mm. A curve A 2  represents EMI shielding effectiveness of another conventional enclosure, and the size of each vent of the conventional enclosure is 4 mm*4 mm. A curve A 3  represents EMI shielding effectiveness of the enclosure  100  with the shield apparatus  40  of  FIG. 1 , and the size of each of the first and second vents  22  and  44  is 6 mm*6 mm.  FIG. 4  clearly indicates that the EMI shielding effectiveness of the enclosure  100  with the shield apparatus  40  is better than the EMI shielding effectiveness of the conventional enclosure. 
     Referring to  FIG. 5 , a second embodiment of an enclosure  100   a  is substantially similar to the first embodiment of the enclosure  100 , except that the enclosure  100   a  includes a rectangular sidewall  20   a  and a shield apparatus  40   a . The sidewall  20   a  defines a plurality of first vents  22   a . A plurality of fastening holes  24   a  is defined in the sidewall  20   a , respectively above and below the first vents  22   a . The shield apparatus  40   a  includes a rectangular shield plate  42   a  and two connecting plates  43   a  perpendicularly extending out from top and bottom sides of the shield plate  42   a . The shield plate  42   a  defines a plurality of second vents  44   a . A plurality of pieces  46   a  protrudes out from a side of each connecting plate  43   a  away form the shield plate  42   a , arrayed along a lengthwise direction of the connecting plate  43   a . In assembly, the pieces  46   a  of the shield apparatus  40   a  are latched into the fastening holes  24   a  of the sidewall  20   a  from an inner side of the sidewall  20   a , to allow the second vents  44   a  to respectively align with the first vents  22   a . A distance between the sidewall  20   a  and the shield plate  42   a  is greater than the side length of the first vents  22   a.    
     It is to be understood, however, that even though numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structure and function of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.