Abstract:
An exemplary electronic device includes a cover, a motherboard and a driving module both disposed at an inner side of the cover, an electronic component fixed on the motherboard, and a fan duct mounted on the motherboard and covering the electronic component. The driving module has a rotating shaft for supportively driving an optical disk rotating. The fan duct guides hot air therein toward the driving module.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The disclosure relates to electronic devices, and particularly to an electronic device facilitating heat dissipation. 
         [0003]    2. Description of Related Art 
         [0004]    Nowadays, with the development of electronics technology, an electronic device such as a Digital Video Disc (DVD) player is devised to be much thinner and smaller than before, yet hold many more electronic modules. However, the electronic modules generate a large amount of heat during operation. The interior space of the electronic device is very limited, and the electronic modules occupy much of that space, which results in heat generated by the electronic modules accumulating rather than being dissipated in time. 
         [0005]    What is needed, therefore, is an electronic device which can overcome the limitations described. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    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, like reference numerals designate corresponding parts throughout the several views. 
           [0007]      FIG. 1  is an isometric, assembled view of an electronic device in accordance with one embodiment of the disclosure. 
           [0008]      FIG. 2  is similar to  FIG. 1 , but with a top cover of the electronic device omitted. 
           [0009]      FIG. 3  is an exploded view of the electronic device of  FIG. 1 . 
           [0010]      FIG. 4  is an inverted, enlarged view of a fan duct of the electronic device of  FIG. 3 . 
           [0011]      FIG. 5  is an inverted view of the electronic device of  FIG. 1 . 
           [0012]      FIG. 6  is an isometric, inverted view of a top cover of the electronic device of  FIG. 1 . 
           [0013]      FIG. 7  is similar to  FIG. 1 , but showing an optical disk engaged on the electronic device. 
       
    
    
     DETAILED DESCRIPTION 
       [0014]    Referring to  FIGS. 1-3 , an electronic device in accordance with an embodiment of the disclosure includes a bottom cover  10 , a motherboard  20 , a driving module  30 , an electronic component  40 , a fan duct  50 , and a top cover  70 . The top cover  70  and the bottom cover  10  are assembled together and receive the motherboard  20 , the driving module  30 , the electronic component  40 , and the fan duct  50  therein. The electronic component  40  is arranged on a top side of the motherboard  20 . The fan duct  50  covers the electronic component  40  and is aligned with the driving module  30 . In this embodiment, the electronic device is a DVD player. 
         [0015]    The electronic component  40  generates heat during operation, and is disposed at an end of the motherboard  20  near the driving module  30 . A plurality of connectors  41  are disposed at another end of the motherboard  20  away from the driving module  30 . 
         [0016]    Also referring to  FIG. 4 , the fan duct  50  is integrally formed as a single piece and made of plastic. The fan duct  50  includes a body  52  parallel to the motherboard  20 , and two side walls  54  perpendicularly and downwardly extending from two opposite sides of the body  52  toward the motherboard  20 . The electronic component  40  is received in the fan duct  50 . The body  52  defines a plurality of parallel elongated through holes  520  in an end thereof near the driving module  30 , corresponding to the electronic component  40 . That is, in the illustrated embodiment, the through holes  520  are in the form of through slots. A plurality of receiving portions  522  are formed at another end of the body  52  away from the driving module  30 . The receiving portions  522  receive the connectors  41  therein for preventing the connectors  41  from moving when subjected to external force. 
         [0017]    Also referring to  FIG. 5 , the bottom cover  10  defines a plurality of elongated ventilation holes  100  in a side thereof for cooling air from the ambient environment to flow therethrough. That is, in the illustrated embodiment, the ventilation holes  100  are in the form of through slots. The driving module  30  extends from a side of the bottom cover  10  away from the ventilation holes  100 , to a middle of the bottom cover  10 . The driving module  30  has a rotating shaft  31 , which is located near the middle of the bottom cover  10 . The electronic component  40  is located between the rotating shaft  31  and the ventilation holes  100  of the bottom cover  10 . The electronic component  40 , the rotating shaft  31 , and the ventilation holes  100  are substantially aligned along a same longitudinal axis of the bottom cover  10 . 
         [0018]    Also referring to  FIG. 6 , a circular concave portion  700  is inwardly formed at a middle of the top cover  70 . The central axis of the concave portion  700  coincides with the rotating shaft  31  of the driving module  30 . The concave portion  700  includes a circular bottom wall  701  parallel to the top cover  70 , and a side wall  702  connecting an outer edge of the bottom wall  701  with the top cover  70 . The bottom wall  701  of the concave portion  700  defines a cutout  703 , corresponding to the rotating shaft  31  of the driving module  30 . The rotating shaft  31  extends through the cutout  703  of the concave portion  700 , and a top end of the rotating shaft  31  is coplanar with a top face of the top cover  70 . A plurality of elongated through holes  705  are defined in a side of the bottom wall  701  opposite to the cutout  703 . That is, in the illustrated embodiment, the through holes  705  are in the form of through slots. The through holes  705  extend radially and are located over the through holes  520  of the fan duct  50 . An air outlet  706  (shown in  FIGS. 1 and 3 ) is defined in the side wall  702  of the concave portion  700 . The top cover  70  forms an airflow pipe  708  corresponding to the air outlet  706  of the concave portion  700 . The airflow pipe  708  extends from the air outlet  706  along a tangent direction of the concave portion  700  and communicates with an outer side of the top cover  70 . 
         [0019]    Also referring to  FIG. 7 , in use, an optical disk  60  is mounted on the rotating shaft  31 , and received in the concave portion  700 . The electronic component  40  on the motherboard  20  generates heat during operation and heats the air in the fan duct  50 . The air pressure below the concave portion  700  is smaller than the air pressure above the concave portion  700  due to the rotating of the optical disk  60 . Thus the heated air in the fan duct  50  flows through the through holes  520  of the fan duct  50 , and through the through holes  705  and the cutout  703  of the concave portion  700  and rotates following the rotating of the optical disk  60 . When the heated air reaches the air outlet  706  of the concave portion  700 , the heated air flows into and through the airflow pipe  708  to the outer side of the top cover  70 . Cooling air in the ambient environment can flow through the ventilation holes  100  of the bottom cover  10  simultaneously to compensate the air pressure inside the fan duct  50 . The electronic component  40  is thus cooled efficiently by the rotating of the optical disk  60  in such a manner 
         [0020]    It is believed that the disclosure and its 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.