Patent Publication Number: US-2015062805-A1

Title: Electronic device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2013-184160, filed on Sep. 5, 2013, the entire contents of which are incorporated herein by reference. 
     FIELD 
     The embodiments discussed herein are related to an electronic device. 
     BACKGROUND 
     Hitherto, an electronic device having a housing that includes a hole and in which water that has been produced inside a device body is discharged to the outside of the device body through the hole is known. 
     In such an electronic device, when a fan is provided to reduce a temperature of a heat-generating electronic component, there may be cases in which water disadvantageously spouts out from the hole due to air blown by the fan. 
     The following is a reference document.
     [Document 1] Japanese Laid-open Patent Publication No. 08-203365.   

     SUMMARY 
     According to an aspect of the invention, an electronic device includes: a fan; a housing configured to houses the fan, the housing including a vent hole configured to introduce outside air, a first air outlet configured to open to a blowing path from the fan, and a second air outlet configured to open at a different position with respect to the blowing path; and an opening and closing member configured to open and close the first air outlet. 
     The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a bottom view of a tablet terminal according to a first embodiment; 
         FIG. 2  is a longitudinal section of the tablet terminal according to the first embodiment taken along the line A-A of  FIG. 1  illustrating a state in which a first air outlet is open and a second air outlet is closed; 
         FIG. 3  is an enlarged view of a main portion schematically illustrating a left lateral surface of the tablet terminal according to the first embodiment; 
         FIG. 4  is a longitudinal section of the tablet terminal according to the first embodiment taken along the line A-A of  FIG. 1  illustrating a state in which the first air outlet is closed and the second air outlet is open; 
         FIG. 5  is a longitudinal section of a tablet terminal according to a second embodiment illustrating a state in which the first air outlet is open and the second air outlet is closed; 
         FIG. 6  is a longitudinal section of the tablet terminal according to the second embodiment illustrating a state in which the first air outlet is closed and a second air outlet is open; 
         FIG. 7  is a longitudinal section of a tablet terminal according to a third embodiment illustrating a state in which the first air outlet is open and the second air outlet is closed; and 
         FIG. 8  is a longitudinal section of the tablet terminal according to the third embodiment illustrating a state in which the first air outlet is closed and the second air outlet is open. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     First Embodiment 
     A first embodiment of the embodiments discussed herein will be described. 
       FIG. 1  illustrates a bottom view illustrating an internal structure of a tablet terminal  10  serving as an example of an electronic device. Note that, in each of the drawings, the width direction of the tablet terminal  10  is indicated by an arrow X, the depth direction by an arrow Y, and the thickness direction (the up-down direction) by an arrow Z. Furthermore, in the following description, the arrangement of each component of the tablet terminal  10  will be described using the terms right side (the left side of  FIG. 1 ), left side (the right side of  FIG. 1 ), front side, rear side, upper side, and lower side. Additionally, the brake line A-A that extends in the X direction across a portion of the tablet terminal  10  on the far side with respect to the middle of the tablet terminal  10  in the Y direction are illustrated in  FIG. 1 . Sections taken along the brake line A-A are illustrated in  FIGS. 2 and 4 . 
     The tablet terminal  10  includes a housing  12  that forms a device body, a fan unit  30  serving as an example of a fan that is housed in the housing  12 , and a first duct member  40  serving as an example of a guide member. The tablet terminal  10  further includes radiation fins  46  serving as an example of a heat conductor, a second duct member  50  serving as an example of an opening and closing member, and a cover member  60  (see  FIG. 2 ). 
     Furthermore, the tablet terminal  10  includes a humidity sensor  70  serving as an example of a humidity detecting unit. Additionally, in the tablet terminal  10 , a touch panel (not shown) for performing input operations and for displaying information is provided on the upper side of the housing  12 . 
     Housing 
     The housing  12  includes sidewalls  13  that are, for example, formed of resin and that are erected in the Z direction so as to be arranged in a rectangular shape in plan view, an upper wall  14  that covers the upper side of the sidewalls  13 , and a bottom wall  15  (see  FIG. 2 ) that covers the lower side of the sidewalls  13 . The sidewalls  13  include a front wall  16  disposed on the front side, a rear wall  17  disposed on the rear side, a right wall  18  disposed on the right side, and a left wall  19  disposed on the left side. 
     Furthermore, a partition wall  22  and a partition wall  24  are provided inside the housing  12 . The partition wall  22  stands erect on the bottom wall  15  (see  FIG. 2 ) and extends from the middle of the rear wall  17  in the X direction and from the inner surface of the rear wall  17  to the middle portion of the housing  12 . The partition wall  24  stands erect on the bottom wall  15  (see  FIG. 2 ) and extends from the inner surface of the left wall  19  and from the middle of the left wall  19  in the Y direction to the middle portion of the housing  12 . Moreover, one end of the partition wall  22  in the Y direction and one end of the partition wall  24  in the X direction are connected to each other. 
     The inside of the housing  12  is partitioned by the partition wall  22  and the partition wall  24  such that the inside of the housing  12  is divided into a waterproof area S 1  and a non-waterproof area S 2  in plan view. In  FIG. 1 , other than the area where the battery  25  and the circuit substrate  26  that are described later are arranged, the waterproof area S 1  is indicated with oblique lines. 
     Waterproof Area 
     The waterproof area S 1  is surrounded by the bottom wall  15  (see  FIG. 2 ), the upper wall  14  (see  FIG. 2 ), the front wall  16 , the right wall  18 , the rear wall  17 , the partition wall  22 , the partition wall  24 , and the left wall  19 . A sealing material (not shown) is attached to the periphery of the waterproof area S 1  such that infiltration of liquid into the waterproof area S 1  from the outside of the housing  12  is restrained. Note that, in the present embodiment, while water is described as an example of a liquid, other liquids may be applied in a similar manner. Furthermore, the waterproof area S 1  is provided with a battery  25  that supplies electric power to each component in the tablet terminal  10  and with the circuit substrate  26  serving as an example of a controller that carries out operation control of each component of the tablet terminal  10 . 
     Circuit Substrate 
     A variety of electronic components are mounted on the circuit substrate  26 . The variety of electronic components include, for example, a central processing unit (CPU)  27  that is in charge of the overall control of the tablet terminal  10 , a chipset (not shown) that controls data transmission and the like of the CPU  27  and the like, and a memory  28  that stores data. Furthermore, the circuit substrate  26  operates on electric power supplied from the battery  25 . Furthermore, an electric signal associated with the operation of the touch panel (not shown) is input to the circuit substrate  26  and an electric signal associated with the display information sent to the touch panel is output from the circuit substrate  26 . 
     A moving image program serving as an example of a program that carries out control that increases the temperature of the CPU  27 , the moving image program displaying moving images on the touch panel, is stored in the memory  28 . Execution of the moving image program by the CPU  27  imposes an operational load on the CPU  27 ; accordingly, the temperature of the CPU  27  is increased compared with the temperature of the CPU  27  when the tablet terminal  10  is booted up. 
     In other words, the circuit substrate  26  operates the CPU  27  when water is to be discharged from the housing  12  (for example, when the circuit substrate  26  receives, from the humidity sensor  70  described later, a command to discharge water) and carries out control of increasing the temperature of the CPU  27  to a temperature higher than the temperature when water is not discharged from the housing  12 . Note that the program for carrying out control of increasing the temperature of the CPU  27  is not limited to the moving image program and a benchmark test program (load program) may be used. 
     The CPU  27  is a component that generates heat when executing signal processing. In order to avert malfunction and the like due to generation of heat, the CPU  27  is preferably cooled during the operation of the tablet terminal  10 . Accordingly, one end of a heat pipe  29  serving as an example of a heat conduction member is in contact with the CPU  27 . 
     Heat Pipe 
     The heat pipe  29  is inserted through a through hole  24 A that is formed in the partition wall  24  and is disposed across the waterproof area S 1  and the non-waterproof area S 2 . Furthermore, the other end of the heat pipe  29  is in contact with the undersurface (lower portion) of the first radiation portion  46 A (see  FIG. 2 ) of the radiation fins  46  described later in the non-waterproof area S 2 . Note that the gap between the heat pipe  29  and the through hole  24 A is filled with a sealing material and a gasket (both not shown). 
     Furthermore, the heat pipe  29  is a hermetic container having a capillary structure with a working fluid filled therein. Moreover, in the heat pipe  29 , the working fluid heated by the radiation of the CPU  27  is evaporated and the vapor is condensed on the low-temperature side where the radiation fins  46  are provided; accordingly, the heat of the CPU  27  is transmitted to the radiation fins  46 . 
     Non-waterproof Area 
     The non-waterproof area S 2  is surrounded by the bottom wall  15  (see  FIG. 2 ), the upper wall  14  (see  FIG. 2 ), the rear wall  17 , the left wall  19 , the partition wall  22 , and the partition wall  24 . A vent hole  17 A that penetrates the rear wall  17  in the Y direction is formed in the rear wall  17  of the non-waterproof area S 2  at a portion near the middle of the rear wall  17  in the X direction. The vent hole  17 A is, for example, formed in a rectangular shape whose longitudinal direction extends in the X direction. The vent hole  17 A has a size large enough to allow the outside air and water to flow into the non-waterproof area S 2  from the outside of the housing  12 . 
     The left wall  19  is disposed so as to face the blowing direction (the X direction) of a blowing path A (indicated by an arrow A with a dot and dash line in  FIG. 2 ) of the fan unit  30  described later. Moreover, a first air outlet  21  that penetrates the left wall  19  of the non-waterproof area S 2  in the X direction is formed in the left wall  19  of the non-waterproof area S 2 . In other words, the first air outlet  21  is open to the blowing path A that extends from the fan unit  30 . 
     The first air outlet  21  has a size that is large enough to allow ventilation to be carried out from the non-waterproof area S 2  to the outside of the housing  12 . Furthermore, the first air outlet  21  includes, for example, a plurality of long holes  21 A (see  FIG. 3 ) that are aligned in the Y direction and that are each elongated in the Z direction and a single through hole  21 B that is formed inside the plurality of long holes  21 A in the X direction and that is in communication with the plurality of long holes  21 A. Moreover, by displacing a top plate  52  of the second duct member  50  described later (see  FIG. 2 ) such that the top plate  52  is accommodated in the through hole  21 B, the plurality of long holes  21 A are closed; accordingly, ventilation in the first air outlet  21  from the non-waterproof area S 2  to the outside of the housing  12  is cut off. 
     As illustrated in  FIG. 2 , the bottom wall  15  is disposed along the XY plane so that the bottom wall  15  faces a direction (as an example, the Z direction) that is different to the blowing direction (the X direction) of the fan unit  30 . Moreover, a second air outlet  15 A that penetrates the bottom wall  15  of the non-waterproof area S 2  in the Z direction is formed in the bottom wall  15  of the non-waterproof area S 2 . 
     The second air outlet  15 A is, for example, a through hole that has a rectangular shape in plan view and that is disposed alongside the first duct member  40  in the Z direction. In other words, the second air outlet  15 A is open at a different position with respect to the blowing path A. Furthermore, the second air outlet  15 A is closed by attaching the cover member  60  described later thereto such that ventilation and discharge of water from the non-waterproof area S 2  to the outside of the housing  12  are cut off. 
     Note that, in the upper surface of the bottom wall  15 , for example, the portion from the lower portion of the partition wall  22  to the second air outlet  15 A is a downward inclined surface  15 B. Furthermore, in the upper surface of the bottom wall  15 , for example, the portion from the second air outlet  15 A to the lower portion of the left wall  19  is a flat surface  15 C extending along the XY plane. 
     Cover Member 
     As illustrated in  FIG. 4 , when seen from the Y direction, the cover member  60  has a sectional shape formed of a rectangular bottom portion  60 A and a support portion  60 B, which is disposed on the upper side of the bottom portion  60 A and that has a right angled triangle shape, integrated together. One end of a wire member  68  serving as an example of a connection member is connected to one end of the bottom portion  60 A in the X direction. Furthermore, the support portion  60 B includes a guided surface  62  extending erect along the YZ plane and an inclined surface  64  that is inclined downwards from the upper end of the guided surface  62  towards the other end of the bottom portion  60 A in the X direction. 
     The cover member  60  closes the second air outlet  15 A when the second duct member  50  described later is in an open position and opens the second air outlet  15 A when the second duct member  50  is in a closed position. In other words, the cover member  60  opens the second air outlet  15 A by being detached from the second air outlet  15 A and closes the second air outlet  15 A by being attached to the second air outlet  15 A. Furthermore, upon opening and closing of the cover member  60 , the wire member  68  opens and closes the first duct member  40 . 
     A plate-shaped guide wall  66  that stands erect along the YZ plane is provided on the upper side of the second air outlet  15 A. The cover member  60  is guided into the second air outlet  15 A as a result of displacing the cover member  60  towards the upper side while the guided surface  62  is in contact with one of the lateral surfaces of the guide wall  66 . Note that by having the undersurface of the guide wall  66  come into contact with the one end of the bottom portion  60 A in the X direction, the peripheral edge of the bottom portion  60 A is fitted to the second air outlet  15 A and the cover member  60  is restricted from entering into the housing  12 . Furthermore, in a state in which the cover member  60  is fitted to the second air outlet  15 A, an undersurface of a bottom plate  41  of the first duct member  40  is in contact with the inclined surface  64  such that the first duct member  40  is supported by the cover member  60 . 
     As illustrated in  FIG. 1 , the fan unit  30 , the first duct member  40 , the radiation fins  46 , the second duct member  50 , and the humidity sensor  70  are housed in the non-waterproof area S 2 . 
     Fan Unit 
     As illustrated in  FIG. 2 , the fan unit  30  is, for example, a sirocco fan and includes a fan cover  32  serving as a body. A rotating shaft  33  whose axial direction extends in the Z direction and that is rotationally driven by a motor (not shown) and a plurality of moving blades  34  formed integrally on the outer periphery of the rotating shaft  33  are provided inside the fan cover  32 . Furthermore, rotation of the rotating shaft  33  and the plurality of moving blades  34  in the fan unit  30  results in air being blown along the blowing path A. 
     The fan cover  32  includes a top plate  32 A disposed on the upper side in the Z direction, a bottom plate  32 B disposed on the lower side in the Z direction, and side plates  32 C. The top plate  32 A is disposed so as to be spaced apart from and parallel to the upper wall  14 . Furthermore, an inlet port (not shown) that penetrates the top plate  32 A in the Z direction and that takes in air is formed in the top plate  32 A. The bottom plate  32 B and the bottom wall  15  are arranged so as to be spaced apart from each other. Furthermore, the bottom plate  32 B is fixed above the bottom wall  15  with brackets (not shown) that are provided on the front side and the rear side of the bottom plate  32 B in the Y direction. 
     Furthermore, a blowing port  32 D that penetrates the fan cover  32  in the X direction and that faces the radiation fins  46  is formed on one end side of the fan cover  32  in the X direction. Accordingly, in the housing  12 , air blown by the fan unit  30  is blown onto the radiation fins  46  such that the CPU  27  (see  FIG. 1 ) is indirectly cooled through the heat pipe  29 . 
     First Duct Member 
     As illustrated in  FIG. 2 , the first duct member  40  is provided between the fan unit  30  and the radiation fins  46 . Furthermore, the first duct member  40  includes the bottom plate  41 , two sidewalls  42  each standing erect in the Z direction on the front side and the rear side of the bottom plate  41  in the Y direction spaced apart from each other, and a top plate  43  that connects the upper sides of two sidewalls  42 . In other words, the first duct member  40  is formed in a tube shape that extends in the X direction. 
     Furthermore, in the first duct member  40 , the area of an opening  40 B that is on the side (the outflow side of the air) that is adjacent to the radiation fins  46  is larger than the opening area of an opening  40 A that is on the side (the inflow side of the air) that is adjacent to the fan unit  30 . Additionally, in the first duct member  40 , the size of the opening on the side that is adjacent to the radiation fins  46  is larger than the size of the external shape of the radiation fins  46 . 
     One end of the bottom plate  41  in the X direction is disposed between the guide wall  66  and the bottom plate  32 B of the fan cover  32 . Furthermore, the other end of the bottom plate  41  in the X direction extends to the vicinity of the lower side of the first radiation portion  46 A of the radiation fins  46  described later. Moreover, while the cover member  60  is attached to the second air outlet  15 A, the bottom plate  41  is disposed in an inclined manner and is supported by the cover member  60 . Accordingly, when water is not discharged from the housing  12 , the first duct member  40  is supported by the cover member  60 . 
     One end of the top plate  43  in the X direction is disposed on the upper side of the top plate  32 A of the fan cover  32 , and the other end of the top plate  43  in the X direction is disposed on the upper side of the first radiation portion  46 A of the radiation fins  46 . In other words, for example, a portion of the first radiation portion  46 A of the radiation fins  46  is accommodated inside the first duct member  40 . 
     Furthermore, pins  44 , whose axial direction extends in the Y direction, are provided in the one end of the top plate  43  in the X direction, each on the front side and rear side of the top plate  43  in the Y direction. The pins  44  are inserted into guide grooves (not shown) that are formed in a pair of side plates such that sliding and rotation of the pins  44  in the X direction along the guide grooves may be performed. In other words, the other end of the first duct member  40  in the X direction may be moved up and down in an arc about the pins  44  at the one end of the first duct member  40  in the X direction. 
     Accordingly, the first duct member  40  covers a portion from the blowing port  32 D of the fan unit  30  to the first radiation portion  46 A of the radiation fins  46 . Accordingly, air blown out from the blowing port  32 D is guided to the radiation fins  46  by the first duct member  40 . 
     Furthermore, the first duct member  40  is disposed so as to be aligned with the second air outlet  15 A in the Z direction. Moreover, in the first duct member  40 , the other end of the wire member  68  is connected to the top plate  43 . With the above, when the cover member  60  is pulled out from the second air outlet  15 A towards the lower side in the Z direction, the top plate  43  is pulled by the wire member  68  and the other end of the first duct member  40  in the X direction is lifted towards the upper side. In other words, when the second air outlet  15 A is open, the first duct member  40  guides the air blown out from the fan unit  30  to the radiation fins  46  and the upper portion of the housing  12 . 
     Radiation Fins 
     As illustrated in  FIG. 2 , the radiation fins  46  are provided between the fan unit  30  and the first air outlet  21 . Furthermore, the radiation fins  46  include the first radiation portion  46 A and a second radiation portion  46 B that has a larger radiation area than that of the first radiation portion  46 A. In the first radiation portion  46 A and the second radiation portion  46 B, a plurality of metal plates is aligned in the Y direction spaced apart from one another. Furthermore, the radiation fins  46  are fixed above the bottom wall  15  with brackets (not shown) provided on the front side and the rear side of the radiation fins  46  in the Y direction. Additionally, the radiation fins  46  release heat of the CPU  27  (see  FIG. 1 ) through the heat pipe  29 . 
     Second Duct Member 
     As illustrated in  FIG. 2 , the second duct member  50  is provided between the radiation fins  46  and the left wall  19 . Furthermore, the second duct member  50  includes the top plate  52  and two sidewalls  54  disposed on the front side and the rear side of the top plate  52  in the Y direction spaced apart from each other. In other words, the second duct member  50  is formed so that a section viewed from the X direction has a C-shape. The external shape of the top plate  52  has a size that fits in the through hole  21 B of the first air outlet  21 . Furthermore, pins  53  (see  FIG. 1 ) that project in the Y direction are provided at the two end surfaces of the top plate  52  in the Y direction. 
     Two plates  56  having the two sidewalls  54  of the second duct member  50  in between in the Y direction are provided in the housing  12  between the radiation fins  46  and the left wall  19 . Guide grooves  58  are formed in the two plates  56 . Furthermore, the pins  53  of the second duct member  50  (see  FIG. 1 ) are inserted into the guide grooves  58 . The pins  53  have an outer diameter that is slightly smaller than the width of the guide grooves  58  and are guided while being in contact with the guide grooves  58 . Furthermore, one end of a columnar lever member  59  (see  FIG. 1 ) is connected to one of the pins  53 . 
     As illustrated in  FIG. 3 , a long hole  19 A that is long in the Z direction is formed beside the first air outlet  21  in the left wall  19 . Moreover, the lever member  59  passes through the long hole  19 A and projects to the outside of the left wall  19 . Accordingly, when the lever member  59  is operated towards the upper side in the Z direction, the second duct member  50  (see  FIG. 2 ) moves to the open position, and when the lever member  59  is operated towards the lower side in the Z direction, the second duct member  50  moves to the closed position. In other words, with the operation of the lever member  59 , the second duct member  50  may open and close the first air outlet  21 . 
     As illustrated in  FIG. 2 , the open position of the second duct member  50  is a position in which one end of the top plate  52  is disposed on the upper side of the second radiation portion  46 B, in which the other end of the top plate  52  covers a portion between the radiation fins  46  and the left wall  19 , and in which the first air outlet  21  is open. 
     As illustrated in  FIG. 4 , the closed position of the second duct member  50  is a position in which the top plate  52  is fitted to the first air outlet  21  (the through hole  21 B), in which the portion between the radiation fins  46  and the left wall  19  is open, and in which the first air outlet  21  is closed. 
     Humidity Sensor 
     As illustrated in  FIG. 2 , the humidity sensor  70  is fixed on the bottom wall  15  at a portion adjacent to the partition wall  22 . Furthermore, the humidity sensor  70  is, for example, an electric humidity sensor that detects the humidity inside the housing  12  by detecting the change in permittivity that changes in accordance with the change in the amount of water contained in a polymeric membrane. Humidity data measured by the humidity sensor  70  is sent to the CPU  27  (see  FIG. 1 ). 
     In the circuit substrate  26  illustrated in  FIG. 1 , the CPU  27  compares an upper limit of the humidity data that is stored in the memory  28  and the humidity data that has been detected by the humidity sensor  70  with each other. Then, when the humidity data detected by the humidity sensor  70  exceeds the upper limit (preset humidity), the CPU  27  determines that water has infiltrated into the non-waterproof area S 2  or that there is excessive water in the non-waterproof area S 2 , and the moving image program described above is executed. In other words, the humidity data that has exceeded the preset humidity serves as a water discharge command. Note that a warning that the humidity data has exceeded the upper limit and a message that the moving image program is being executed are displayed on the touch panel described above (not shown), for example. 
     Functions and effects of the first embodiment will be described next. 
     During Normal Operation 
     As illustrated in  FIG. 2 , during normal operation of the tablet terminal  10  (when water W is not discharged from the housing  12 ), the first air outlet  21  is open, and the second air outlet  15 A is closed by the cover member  60 . In other words, the second air outlet  15 A, being closed by the cover member  60 , may suppress the blown air from leaking therefrom. Furthermore, since the first duct member  40  is supported by the cover member  60 , the position of the first duct member  40  may be stabilized. 
     Next, when the fan unit  30  starts operating, air is blown out from the blowing port  32 D. At this time, in the first duct member  40 , the top plate  43  covers the portion from the fan unit  30  to the radiation fins  46 , and the bottom plate  41  is disposed in an inclined manner. Accordingly, a portion of the air blown out from the fan unit  30  flows towards the radiation fins  46  along the blowing path A and the remaining portion flows towards a portion below the radiation fins  46 . 
     The portion of the air blown out from the fan unit  30  flows through the radiation fins  46  and reduces the temperature of the radiation fins  46 . At this time, since the top plate  52  of the second duct member  50  covers the portion from the radiation fins  46  to the left wall  19 , as illustrated by the arrow A, the air that has flowed through the radiation fins  46  flows towards the first air outlet  21 , passes through the first air outlet  21 , and flows to the outside of the housing  12 . 
     Meanwhile, as illustrated by an arrow B (a broken line), the remaining air blown out from the fan unit  30  flows towards the first air outlet  21  between the radiation fins  46  and the heat pipe  29 , and the bottom wall  15  (the lower portion of the housing  12 ), passes through the first air outlet  21 , and flows to the outside of the housing  12 . Note that during normal operation, the humidity inside the non-waterproof area S 2  detected by the humidity sensor  70  is lower than the preset humidity. 
     During Discharge Operation 
     When water is spilled on the tablet terminal  10  or when the tablet terminal  10  is dropped into a pool of water, for example, and water W infiltrates into the non-waterproof area S 2 , the user slides the lever member  59  illustrated in  FIG. 3  towards the lower side with his/her finger. With the above, as illustrated in  FIG. 4 , the second duct member  50  rotates 90° and moves to the closed position and the top plate  52  closes the first air outlet  21 . Note that a discharge operation period refers to a period when water W that has infiltrated into the housing  12  is discharged to the outside of the housing  12 . 
     Furthermore, the user pulls the cover member  60  towards the lower side in the Z direction and detaches the cover member  60  from the bottom wall  15 . With the above, the second air outlet  15 A becomes open and the wire member  68  is pulled, and the end portion of the first duct member  40  is moved towards the upper side. In other words, the user may open the second air outlet  15 A and move the first duct member  40  with a single operation, that is, by detaching the cover member  60 ; accordingly, the direction of air blown out from the fan unit  30  may be changed with a simple operation. Then, a gap allowing ventilation is formed between the top plate  43  and the radiation fins  46  and the bottom plate  41  is disposed between the radiation fins  46  and the fan unit  30 . 
     Note that, in the tablet terminal  10 , since the first duct member  40  is disposed so as to be aligned with the second air outlet  15 A in the Z direction, compared with the case in which the first duct member  40  is not disposed so as to be aligned with the second air outlet  15 A, the length of the wire member  68  may be short. 
     As illustrated by an arrow C (a dot and dash line), at this time, the air that has been guided by the first duct member  40  to flow from the fan unit  30  to the radiation fins  46  passes through the radiation fins  46  and flows towards the first air outlet  21 ; however, because the first air outlet  21  is closed, the air flows towards the lower side along the top plate  52 . Furthermore, the blown air flows between the bottom wall  15  and the radiation fins  46 , passes through the second air outlet  15 A, and flows to the outside of the housing  12 . Accordingly, the water W that has accumulated on the flat surface  15 C of the bottom wall  15  is swept by the blown air, passes through the second air outlet  15 A, and is discharged to the outside of the housing  12 . 
     Furthermore, as illustrated by an arrow D (a broken line), the air that has been guided by the first duct member  40  to flow from the fan unit  30  along the top plate  43  flows between the radiation fins  46  and the upper wall  14 , and flows to the lower side along the left wall  19  and the top plate  52 . Moreover, the blown air flows between the bottom wall  15  and the radiation fins  46 , passes through the second air outlet  15 A, and flows to the outside of the housing  12 . With the above, in the tablet terminal  10 , water (not shown) adhered to the undersurface of the upper wall  14  (the upper portion of the housing  12 ) is swept by the blown air; accordingly, discharge of water W from the second air outlet  15 A may be facilitated. 
     As above, in the tablet terminal  10 , since the first air outlet  21  that is positioned in the blowing direction of the fan unit  30  is closed by the second duct member  50  during the discharge operation, it will be possible to suppress water W from spouting out from the first air outlet  21  due to the air blown out from the fan unit  30 . Furthermore, in the tablet terminal  10 , discharge of water W from portions of the housing  12  unintended by the user may be restricted since the water W is discharged from the second air outlet  15 A when the user detaches the cover member  60 . Note that even if the user changes (tilts) the position of the tablet terminal  10 , discharge of water W from portions unintended by the user may be restricted since the water W is discharged from the second air outlet  15 A. 
     Furthermore, in the tablet terminal  10 , the CPU  27  (see  FIG. 1 ) executes the moving image program when water W infiltrates into the non-waterproof area S 2  and when the humidity sensor  70  detects a humidity that is equivalent to or higher than the preset humidity. Accordingly, operational load is imposed on the CPU  27  and the temperature of the CPU  27  is increased compared with the temperature of the CPU  27  when the tablet terminal  10  is booted up. Then, the heat of the CPU  27  is transmitted to the radiation fins  46  through the heat pipe  29  and the temperature of the radiation fins  46  increases. 
     Subsequently, with the increase in temperature of the radiation fins  46 , the temperature of the blown air passing through the radiation fins  46  increases as well. Accordingly, the water W (residual water) inside the non-waterproof area S 2  evaporates when it comes into contact with the blown air having a high temperature and, further, is discharged to the outside of the housing  12  from the second air outlet  15 A by the blown air. As described above, in the tablet terminal  10 , since the temperature of the blown air is increased with the increase in temperature of the radiation fins  46  that is associated with the heat generation of the CPU  27 , discharge of water W from the non-waterproof area S 2  of the housing  12  may be facilitated. 
     Furthermore, in the tablet terminal  10 , since the radiation fins  46  are heated, water (not shown) that has adhered to the radiation fins  46  is evaporated and, further, is moved to the second air outlet  15 A with the blown air. With the above, water may be restrained from remaining on the radiation fins  46 ; accordingly, even if the radiation fins  46  include copper or aluminum, corrosion of the radiation fins  46  may be averted. Furthermore, since water may be suppressed from remaining on the radiation fins  46 , adhesion of dust to the radiation fins  46  may be suppressed as well. 
     Furthermore, in the tablet terminal  10 , since the moving image program is executed automatically based on the detection result of the humidity detected by the humidity sensor  70 , discharge of water W from the non-waterproof area S 2  of the housing  12  may be facilitated without the user operating the tablet terminal  10 . 
     Additionally, in the tablet terminal  10 , since the radiation fins  46  are heated using the generated heat (waste heat) of the CPU  27  (see  FIG. 1 ) provided in the waterproof area S 1  (see  FIG. 1 ), a separate component for heating the radiation fins  46  does not have to be provided. Accordingly, a reduction in size of the housing  12  may be achieved and it is possible for the tablet terminal  10  to save energy. Moreover, the number of parts used in the tablet terminal  10  may be reduced. 
     Furthermore, in the tablet terminal  10 , since the heat pipe  29  is in contact with the undersurface of the radiation fins  46 , blockage of the ascending flow of vapor from the radiation fins  46  by the heat pipe  29  may be suppressed. 
     Moreover, in the tablet terminal  10 , since the second air outlet  15 A is formed in the bottom wall  15 , water W inside the non-waterproof area S 2  moves towards the second air outlet  15 A by its own weight. Accordingly, discharge of water W from the non-waterproof area S 2  may be facilitated. Additionally, in the tablet terminal  10 , since the bottom wall  15  is inclined towards the second air outlet  15 A, in other words, since the bottom wall  15  includes the inclined surface  15 B, discharge of water W from the second air outlet  15 A may be facilitated by the weight of the water W. 
     Subsequently, in the tablet terminal  10 , when the discharge of water W from the non-waterproof area S 2  is completed, such as when there is no more water W to be discharged from the second air outlet  15 A, the user attaches the cover member  60  to the second air outlet  15 A. At this time, since the guided surface  62  of the cover member  60  is guided along the lateral surface of the guide wall  66 , the cover member  60  may be readily attached to the second air outlet  15 A. Note that when the cover member  60  is attached to the second air outlet  15 A, the wire member  68  is released from the pulled state; accordingly, the end portion of the first duct member  40  moves towards the lower side. 
     Subsequently, the user operates the touch panel (not shown) and stops the moving image program. Then, the user slides the lever member  59  (see  FIG. 3 ) towards the upper side. Accordingly, the second duct member  50  is moved to the open position and the first air outlet  21  is opened. 
     Second Embodiment 
     A second embodiment of the embodiments discussed herein will be described next. 
     A configuration of a tablet terminal  100  serving as an example of an electronic device according to a second embodiment illustrated in  FIGS. 5 and 6  is changed in the following manner with respect to the tablet terminal  10  (see  FIGS. 1 to 4 ) according to the first embodiment described above. Note that in the second embodiment, configurations similar to those of the first embodiment described above are denoted with the same reference numerals as the first embodiment and descriptions thereof are omitted. 
     As illustrated in  FIG. 5 , the tablet terminal  100  according to the second embodiment is provided with a cut-off cover  110  in place of the cover member  60  (see  FIG. 2 ) of the tablet terminal  10  (see  FIG. 2 ) of the first embodiment. 
     The cut-off cover  110  has an integrated shape formed of a cover portion  112  serving as an example of a cover member and a guide portion  114  serving as an example of the guide member. Furthermore, the cut-off cover  110  may be moved in the Z direction between the fan unit  30  and the radiation fins  46 . Note that the tablet terminal  100  has a configuration similar to that of the tablet terminal  10  (see  FIG. 2 ) of the first embodiment except for the cut-off cover  110 . 
     When seen from the Y direction, the cover portion  112  has a sectional shape formed of a rectangular bottom portion  112 A and an inclined portion  112 B, which is disposed on the upper side of the bottom portion  112 A and that has a right angled triangle shape, integrated together. The bottom portion  112 A has a size that fits in the second air outlet  15 A. The inclined portion  112 B includes a lateral surface  113  extending erect along the YZ plane and an inclined surface  115  that is inclined downwards from the upper end of the lateral surface  113  towards the other end of the bottom portion  112 A in the X direction. In other words, the upper surface of the cover portion  112  and the undersurface of the guide portion  114  are the inclined surface  115  that is inclined with respect to the horizontal direction (as an example, the X direction) of the housing  12 . 
     In a state in which the cover portion  112  closes the second air outlet  15 A, the guide portion  114  is disposed between the fan unit  30  and the radiation fins  46 . Furthermore, the guide portion  114  includes the inclined surface  115  serving as a bottom plate, two sidewalls  116  each standing erect in the Z direction on the front side and the rear side of the inclined surface  115  in the Y direction spaced apart from each other, and a top plate  117  that connects the upper side of the two sidewalls  116 . In other words, the guide portion  114  is formed in a tube shape that extends in the X direction. 
     Furthermore, in the guide portion  114 , the area of the opening that is on the side adjacent to the radiation fins  46  is larger than the opening area of the opening adjacent to the fan unit  30 . Additionally, in the guide portion  114 , the size of the opening on the side adjacent to the radiation fins  46  is larger than the external shape of the radiation fins  46 . 
     In a state in which the cover portion  112  closes the second air outlet  15 A, one end of the top plate  117  in the X direction is disposed adjacent to the top plate  32 A of the fan cover  32  and the other end of the top plate  117  in the X direction is disposed adjacent to the first radiation portion  46 A of the radiation fins  46 . Furthermore, a plate-shaped erect portion  118  that stands erect towards the upper wall  14  of the housing  12  is formed at the end of the top plate  117  that is on the side adjacent to the radiation fins  46 . 
     The height of the erect portion  118  in the Z direction is, for example, higher than the height of the first radiation portion  46 A in the Z direction. Furthermore, in a state in which the cover portion  112  closes the second air outlet  15 A, the erect portion  118  is in contact with the undersurface of the upper wall  14 . Note that a stopper (not shown) that restricts the cut-off cover  110  to move towards the lower side when the erect portion  118  faces the first radiation portion  46 A of the radiation fins  46  is provided in the housing  12 . Furthermore, the top plate  117  and the erect portion  118  of the cut-off cover  110  are configured to remain inside the housing  12 . 
     Functions and effects of the second embodiment will be described next. 
     During Normal Operation 
     As illustrated in  FIG. 5 , during normal operation of the tablet terminal  100 , the first air outlet  21  is open, and the second air outlet  15 A is closed by the cut-off cover  110 . In other words, the second air outlet  15 A, being closed by the cut-off cover  110 , may suppress the blown air from leaking therefrom. 
     Next, when the fan unit  30  starts operating, air is blown out from the blowing port  32 D. At this time, the top plate  117  covers a portion between the fan unit  30  and the radiation fins  46 . Accordingly, a portion of the air blown out from the fan unit  30  flows towards the radiation fins  46  along the top plate  117  and the remaining portion flows along the inclined surface  115  to the portion below the radiation fins  46 . 
     The portion of the air blown out from the fan unit  30  flows through the radiation fins  46  and reduces the temperature of the radiation fins  46 . At this time, since the top plate  52  of the second duct member  50  covers the portion from the radiation fins  46  to the left wall  19 , as illustrated by the arrow A, the air that has flowed through the radiation fins  46  flows towards the first air outlet  21 , passes through the first air outlet  21 , and flows to the outside of the housing  12 . 
     Meanwhile, as illustrated by an arrow F (a broken line), the remaining air blown out from the fan unit  30  flows towards the first air outlet  21  between the radiation fins  46  and the heat pipe  29 , and the bottom wall  15  (the lower portion of the housing  12 ), passes through the first air outlet  21 , and flows to the outside of the housing  12 . Accordingly, when there are water droplets due to dew condensation and the like at the lower portion of the housing  12 , the water droplets are discharged to the outside of the housing  12  by the blown air illustrated by the arrow F. 
     During Discharge Operation 
     When the user slides the lever member  59  (see  FIG. 3 ) with his/her finger towards the lower side in a case in which water W has infiltrated into the non-waterproof area S 2  of the tablet terminal  100 , as illustrated in  FIG. 6 , the first air outlet  21  is closed by the top plate  52  of the second duct member  50 . 
     Furthermore, when the user pulls the cut-off cover  110  towards the lower side in the Z direction until the displacement of the cut-off cover  110  is restricted by the stopper described above (not shown), the erect portion  118  is disposed so as to face the blowing port  32 D and a gap is formed between the top plate  117  and the fan unit  30 . Accordingly, the second air outlet  15 A is opened. 
     The blown air flowing in the X direction from the blowing port  32 D of the fan unit  30  is guided by the erect portion  118  and, as illustrated by an arrow G (a broken line), flows towards the upper side, passes above the radiation fins  46 , and flows to the first air outlet  21 . Here, since the first air outlet  21  is closed, the blown air flows along the top plate  52  towards the lower side. Then, the blown air flows between the bottom wall  15  and the radiation fins  46 , passes through the second air outlet  15 A, and flows to the outside of the housing  12 . Accordingly, the water W that has accumulated on the flat surface  15 C of the bottom wall  15  is swept by the blown air, passes through the second air outlet  15 A, and is discharged to the outside of the housing  12 . 
     Note that, in the tablet terminal  100 , since the blown air is guided to the upper portion of the housing  12  by the erect portion  118 , the water droplets (not shown) that are adhered to the undersurface of the upper wall  14  may be discharged from the second air outlet  15 A. Furthermore, in the tablet terminal  100 , there are cases in which water W adheres to the upper portion of the cut-off cover  110  when the water W that has reached the second air outlet  15 A is discharged to the outside of the housing  12 . Now, since the inclined surface  115  is formed in the cut-off cover  110 , the water W that has adhered to the cut-off cover  110  flows obliquely downwards on the inclined surface  115 . Accordingly, water W may be suppressed from remaining on the cut-off cover  110 . 
     As illustrated by an arrow H (a broken line), the blown air guided along the erect portion  118  and the top plate  117  towards the lower side passes through the second air outlet  15 A and is discharged to the outside of the housing  12 . Furthermore, as illustrated by an arrow I (a solid line), the water W on the inclined surface  15 B of the bottom wall  15  flows obliquely downwards on the inclined surface  15 B by its own weight and is discharged from the second air outlet  15 A. 
     As above, in the tablet terminal  100 , since the first air outlet  21  is closed by the second duct member  50 , it will be possible to suppress water W from spouting out from the first air outlet  21  due to the air blown out from the fan unit  30 . Furthermore, in the tablet terminal  100 , discharge of water W from portions of the housing  12  unintended by the user may be restricted since the water W is discharged from the second air outlet  15 A when the user detaches the cut-off cover  110 . Note that even if the user changes (tilts) the position of the tablet terminal  100 , discharge of water W from portions unintended by the user may be restricted since the water W is discharged from the second air outlet  15 A. 
     Furthermore, in the tablet terminal  100 , the CPU  27  (see  FIG. 1 ) executes the moving image program when water W infiltrates into the non-waterproof area S 2  and when the humidity sensor  70  detects a humidity that is equivalent to or higher than the preset humidity. Accordingly, operational load is imposed on the CPU  27  and the temperature of the CPU  27  becomes higher than the temperature of the CPU  27  when the tablet terminal  100  is booted up. Then, the heat of the CPU  27  is transmitted to the radiation fins  46  through the heat pipe  29  and the temperature of the radiation fins  46  increases. 
     Subsequently, with the increase in temperature of the radiation fins  46 , the temperature of the blown air passing through the radiation fins  46  increases as well. Accordingly, the water W (residual water) inside the non-waterproof area S 2  evaporates when it comes into contact with the blown air having a high temperature and, further, is discharged to the outside of the housing  12  from the second air outlet  15 A by the blown air. As described above, in the tablet terminal  100 , since the temperature of the blown air is increased with the increase in temperature of the radiation fins  46  that is associated with the heat generation of the CPU  27 , discharge of water W from the non-waterproof area S 2  of the housing  12  may be facilitated. 
     Subsequently, in the tablet terminal  100 , when the discharge of water W from the non-waterproof area S 2  is completed, such as when there is no more water W to be discharged from the second air outlet  15 A, as illustrated in  FIG. 5 , the user attaches (fits) the cut-off cover  110  to the second air outlet  15 A. 
     Subsequently, the user operates the touch panel (not shown) and stops the moving image program. Then, the user slides the lever member  59  (see  FIG. 3 ) towards the upper side. Accordingly, the second duct member  50  is moved to the open position and the first air outlet  21  is opened. 
     Third Embodiment 
     A third embodiment of the embodiments discussed herein will be described next. 
     A configuration of a tablet terminal  120  serving as an example of an electronic device according to a third embodiment illustrated in  FIGS. 7 and 8  is changed in the following manner with respect to the tablet terminal  100  (see  FIGS. 5 and 6 ) according to the second embodiment described above. Note that in the third embodiment, configurations similar to those of the first and second embodiments described above are denoted with the same reference numerals as the first and second embodiments and descriptions thereof are omitted. 
     As illustrated in  FIG. 7 , the tablet terminal  120  according to the third embodiment is provided with a roller blind  122  in place of the second duct member  50  (see  FIG. 5 ) of the tablet terminal  100  (see  FIG. 5 ) of the second embodiment. The roller blind  122  includes, for example, a screen material  123 , a winding portion  126  that winds the screen material  123  and that allows the screen material  123  to be pulled out, and two shafts  128  around which the screen material  123  are wound. 
     The screen material  123  is, for example, a wide film material whose width in the Y direction is wider than the width of the first air outlet  21  in the Y direction. Furthermore, the screen material  123  includes a moving portion  124  serving as an example of the opening and closing member and a connection portion  125  serving as an example of the connection member. Moreover, a portion of the moving portion  124  of the screen material  123  is wound around a rotating shaft  129  of the winding portion  126  and the connection portion  125  of the screen material  123  is connected to the cover portion  112  of the cut-off cover  110 . 
     The moving portion  124  includes a ventilation portion  124 A and a non-ventilation portion  124 B. A plurality of through holes  124 C is formed in the ventilation portion  124 A. Note that no through holes are formed in the non-ventilation portion  124 B. The connection portion  125  is, for example, formed continuously with the ventilation portion  124 A. 
     The winding portion  126  is disposed above one end portion of the radiation fins  46  in the X direction such that the longitudinal direction of the winding portion  126  extends in the Y direction. Furthermore, the winding portion  126  includes the rotating shaft  129 , two end portions of which are supported by bearing members (not shown) in a rotatable manner and in which the axial direction extends in the Y direction. As described above, the one end of the screen material  123  is fixed to the rotating shaft  129  with an adhesive. The rotating shaft  129  rotates clockwise in  FIGS. 7 and 8  to wind the screen material  123  around the rotating shaft  129 . 
     When the screen material  123  is pulled out from the winding portion  126 , the rotating shaft  129  rotates counterclockwise in  FIGS. 7 and 8 . Note that the winding portion  126  includes a lock mechanism (not shown) so as to, during normal operation, keep the ventilation portion  124 A oriented so as to face the first air outlet  21  in the X direction and so as to, during the discharge operation, keep the non-ventilation portion  124 B oriented so as to face the first air outlet  21  in the X direction. 
     The two shafts  128  are disposed so as to be spaced apart from the inner surface of the left wall  19  and are disposed so as to be spaced apart from each other in the Z direction. Furthermore, the axial direction of each of the two shafts  128  extends in the Y direction, and when viewed in the X direction, the two shafts  128  are disposed so that the first air outlet  21  is positioned therebetween. Moreover, by winding the screen material  123  around each of the two shafts  128 , the screen material  123  between the two shafts  128  is extended along the YZ plane and is positioned so as to face the first air outlet  21 . 
     As above, in the tablet terminal  120 , when the cut-off cover  110  closes the second air outlet  15 A, the ventilation portion  124 A is arranged so as to face the first air outlet  21 . Furthermore, in the tablet terminal  120 , when the cut-off cover  110  opens the second air outlet  15 A, the non-ventilation portion  124 B is arranged so as to face the first air outlet  21 . 
     Functions and effects of the third embodiment will be described next. 
     During Normal Operation 
     As illustrated in  FIG. 7 , during normal operation, ventilation is allowed in the first air outlet  21  through the through holes  124 C and the second air outlet  15 A is closed by the cut-off cover  110 . 
     Subsequently, when the fan unit  30  starts operating, as illustrated by the arrow A, the blown air that has flowed through the radiation fins  46  flows towards the first air outlet  21 , passes through the through holes  124 C and the first air outlet  21 , and flows to the outside of the housing  12 . 
     Meanwhile, as illustrated by an arrow J (a broken line), the remaining air blown out from the fan unit  30  flows towards the first air outlet  21  between the radiation fins  46  and the heat pipe  29 , and the bottom wall  15 , passes through the through holes  124 C and the first air outlet  21 , and flows to the outside of the housing  12 . Accordingly, when there are water droplets due to dew condensation and the like at the lower portion of the housing  12 , the water droplets are discharged to the outside of the housing  12  by the blown air illustrated by an arrow L. 
     During Discharge Operation 
     As illustrated in  FIG. 8 , when water W infiltrates into the non-waterproof area S 2  of the tablet terminal  120 , the user pulls the cut-off cover  110  towards the lower side in the Z direction until the displacement of the cut-off cover  110  is restricted by the stopper (not shown) described above. Accordingly, the erect portion  118  is disposed so as to face the blowing port  32 D and a gap is formed between the top plate  117  and the fan unit  30 . Furthermore, the second air outlet  15 A becomes open. At this time, while the cut-off cover  110  is displaced to the lower side, the screen material  123  is pulled out from the winding portion  126 . Then, when the displacement of the cut-off cover  110  is restricted, the non-ventilation portion  124 B is disposed so as to face the first air outlet  21  such that the first air outlet  21  is covered. 
     Next, as illustrated by the arrow G, the blown air flowing in the X direction from the blowing port  32 D of the fan unit  30  passes above the radiation fins  46  and flows to the first air outlet  21 . Here, since the first air outlet  21  is closed by the non-ventilation portion  124 B, the blown air flows along the screen material  123  towards the lower side. Then, the blown air flows between the bottom wall  15  and the radiation fins  46 , passes through the second air outlet  15 A, and flows to the outside of the housing  12 . Accordingly, the water W that has accumulated on the flat surface  15 C of the bottom wall  15  is swept by the blown air, passes through the second air outlet  15 A, and is discharged to the outside of the housing  12 . 
     Note that, in the tablet terminal  120 , since the blown air is guided to the upper portion of the housing  12  by the erect portion  118 , the water droplets (not shown) that are adhered to the undersurface of the upper wall  14  may be discharged from the second air outlet  15 A. 
     Meanwhile, as illustrated by the arrow H, the blown air guided along the erect portion  118  and the top plate  117  towards the lower side passes through the second air outlet  15 A and is discharged to the outside of the housing  12 . Furthermore, as illustrated by the arrow I, the water W on the inclined surface  15 B of the bottom wall  15  flows obliquely downwards on the inclined surface  15 B by its own weight and is discharged from the second air outlet  15 A. 
     As above, in the tablet terminal  120 , since the first air outlet  21  is closed by the screen material  123 , it will be possible to suppress water W from spouting out from the first air outlet  21  due to the air blown out from the fan unit  30 . Furthermore, in the tablet terminal  120 , discharge of water W from portions of the housing  12  unintended by the user may be restricted since the water W is discharged from the second air outlet  15 A when the user detaches the cut-off cover  110 . Note that even if the user changes (tilts) the position of the tablet terminal  120 , discharge of water W from portions unintended by the user may be restricted since the water W is discharged from the second air outlet  15 A. 
     Furthermore, in the tablet terminal  120 , the CPU  27  (see  FIG. 1 ) executes the moving image program when water W infiltrates into the non-waterproof area S 2  and when the humidity sensor  70  detects a humidity that is equivalent to or higher than the preset humidity. Then, the heat of the CPU  27  is transmitted to the radiation fins  46  through the heat pipe  29  and the temperature of the radiation fins  46  increases. 
     Subsequently, with the increase in temperature of the radiation fins  46 , the temperature of the blown air passing through the radiation fins  46  increases as well. Accordingly, the water W (residual water) inside the non-waterproof area S 2  evaporates when it comes into contact with the blown air having a high temperature and, further, is discharged to the outside of the housing  12  from the second air outlet  15 A by the blown air. As described above, in the tablet terminal  120 , since the temperature of the blown air is increased with the increase in temperature of the radiation fins  46  that is associated with the heat generation of the CPU  27 , discharge of water W from the non-waterproof area S 2  of the housing  12  may be facilitated. 
     Subsequently, in the tablet terminal  120 , when the discharge of water W from the non-waterproof area S 2  is completed, such as when there is no more water W to be discharged from the second air outlet  15 A, as illustrated in  FIG. 7 , the user attaches the cut-off cover  110  to the second air outlet  15 A. At this time, the screen material  123  is wound by the winding portion  126  such that the ventilation portion  124 A is disposed so as to face the first air outlet  21 . Subsequently, the user operates the touch panel (not shown) and stops the moving image program. 
     As described above, in the tablet terminal  120 , since the screen material  123  is connected to the cut-off cover  110 , the second air outlet  15 A may be opened and the screen material  123  may be displaced by a single operation of moving the cut-off cover  110  towards the lower side. 
     Furthermore, in the tablet terminal  120 , since it is only sufficient to connect the screen material  123  that forms the ventilation portion  124 A and the non-ventilation portion  124 B to the cut-off cover  110 , opening and closing of the first air outlet  21  may be carried out with a simple configuration. 
     Modifications of the embodiments will be described next. In the first, second, and third embodiments described above, the tablet terminals have been described as examples of the electronic device; however, the electronic device may be any other electronic device such as a notebook type personal computer, a smart phone (registered trademark), or the like. 
     The tablet terminals  10 ,  100 , and  120  are not limited to ones having a non-waterproof area S 2  disposed on the left rear portion in plan view as long as the non-waterproof area S 2  is arranged adjacent to the sidewall  13 . Furthermore, the tablet terminals  10 ,  100 , and  120  may be ones without any humidity sensor  70 . In such a case, during the discharge operation, the user may operate the touch panel (not shown) and activate the moving image program. 
     The fan unit  30  is not limited to a sirocco fan and may be an axial fan or a cross flow fan. As regards the radiation fins  46 , the first radiation portion  46 A and the second radiation portion  46 B may be integrated. As regards the fin shape, the fin material, and the position where the heat pipe  29  is in contact with the fin are not limited to those of the radiation fins  46 . 
     The position where the second air outlet  15 A is formed is not limited to the bottom wall  15  and may be a lower portion of the sidewall  13 . Note that the liquid is not limited to water and may be a liquid other than water or may be water mixed with other components. 
     The first duct member  40  is not limited to one that is connected to the cover member  60  with the wire member  68 . For example, the first duct member  40  may be connected to the cover member  60  using a link mechanism. Furthermore, the first duct member  40  is not limited to one with a tube shape; the first duct member  40  may be one with a C-shaped section or one with a section having another shape. 
     The opening and closing member is not limited to one that forms a duct such as the second duct member  50  and may be, for example, a shutter member that moves in the up-down direction to open and close the first air outlet  21 . Furthermore, the second duct member  50  may have no sidewalls  54 . 
     Note that the components used in the first, second, and third embodiment described above may be combined and implemented as appropriate. 
     All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiments of the present invention have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.