Patent Publication Number: US-9433136-B2

Title: Anechoic chamber box for storing electronic apparatus

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a National Phase filing under 35 U.S.C. §371 of PCT/JP2013/079943 filed on Oct. 3, 2013, the entire contents of which are hereby incorporated by reference. 
     TECHNICAL FIELD 
     The present invention relates to an anechoic chamber box for storing electronic apparatuses and more particularly to a storage box capable of storing a plurality of electronic apparatuses which emit a radio wave to prevent the radio wave from leaking to an outside. 
     BACKGROUND ART 
     In recent years, a smart phone spreads rapidly in place of a portable telephone of a conventional type. As one of attractions of the smart phone, a user can freely download and utilize various applications (hereinafter referred to as smart phone applications). 
     However, the smart phone is provided with various OS such as Android (a registered trademark), iPhone iOS (iPhone is a registered trademark), BlackBerry OS (BlackBerry is a registered trademark), Windows Phone 8 (Windows Phone is a registered trademark) and the like, and models are increased more greatly than before. Such an environment is a great worry to traders engaged in development or verification of the smart phone applications. The reason is that cost is increased excessively if they purchase all of models sold successively every time. 
     In consideration of the actual circumstances, a rental service for a smart phone is provided. A rental type includes a type for lending an actual machine of a smart phone to application developers, a type for enabling a smart phone to be utilized in a rental room, and furthermore, a type (a remote rental service) for enabling a smart phone to be utilized by giving remote access via internet. 
     Referring to the remote rental service, there is provided a function for specifying a desirable smart phone application to carry out remote installation into a smart phone, thereby performing remote control such as execution of various commands or debugging. By utilizing the remote rental service, it is possible to reduce cost for purchasing an expensive terminal, and furthermore, to omit a troublesome preparation work such as charge of the smart phone or driver installation. The remote rental service is expected to be practically used widely in the future because of high utility value. 
     It is a matter of course that service traders offering the remote rental service needs to prepare a large number of smart phones having each OS and each model. For this reason, it is necessary to ensure a space for storing these smart phones. A large number of smart phones are to be prepared. Therefore, it is desirable to develop a box capable of storing a large number of smart phones in a saved space. It is necessary to properly take out the stored smart phone in order to carry out charging or maintenance. For this reason, it is demanded to simply enable a large number of smart phones to be stored, and furthermore, to easily put them in/out. 
     In consideration of the simultaneous operation of the large number of smart phones, furthermore, it is indispensable to have a structure of a radio wave anechoic chamber which electrically isolates a box in order not to influence an outside of the box by a radio wave emitted from the smart phone. The problem is not restricted to the radio wave. Since a temperature of an inner part of the box is raised considerably by heat generated by the large number of smart phones, it is necessary to derive a way for discharging the heat to the outside. In addition, it is also necessary to wire the large number of smart phones from the outside of the box to an inside thereof. In other words, there is a peculiar subject in that it is necessary to ensure the structure of the anechoic chamber while taking a measure against heat radiation and performing the wiring. 
     The storage tool capable of easily putting an article in/out is proposed conventionally (for example, see Patent Documents 1 and 2). The floor cabinet described in the Patent Document 1 has the structure in which the drawer provided in the lower part of the cabinet body is freely put in/out in the longitudinal direction, and furthermore, the storage shelf which is movable in the vertical direction is stored in the drawer. 
     Referring to the storage tool described in the Patent Document 2, when the storage box is to be pulled out of the storage cabinet, the hinge attached to the side plate of the storage box is slid along the shape of the rail attached to the side plate of the storage cabinet together with the storage box. Then, the storage box is rotated with the hinge set as a fulcrum and the storage box is completely pulled out toward the outside of the storage cabinet so that the storage box can be revolved at almost 360°. 
     Moreover, there is also proposed the storage tool intended for implementing a large amount of storage with space saving (for example, see the Patent Documents 3 and 4). The storage device described in the Patent Document 3
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relates to a storage device in which the storage portion is disposed in two front and rear stages in the box-shaped body and has an object to set a dead space to be substantially zero, and left and right rear storage boxes can be longitudinally moved by the upper and lower rails and the front storage box is suspended and held by means of a bearing on the rail of the corresponding rear storage box. In the state in which the front and rear storage boxes on the left or right side are forward pulled out, consequently, it is possible to move the front storage box on the right or left side to this side of the front storage box on the left or right side which is adjacent thereto.
       

     The slide type many-sided cabinet described in the Patent Document 4 has an object to utilize a small space without any waste and to enable storage depending on usability, and has the front storage portion to be opened in the direction of the front surface (the forward direction) and the rear storage portion to be opened at the side surface in at least one direction (the transverse direction) of the cabinet which is pulled out. 
     Moreover, the storage tool devised in relation to the wiring is also proposed (for example, see Patent Documents 5 and 6).
         1380765485223_1.aspx?Time=20130918094933328# — 
 
The storage unit described in the Patent Document 5 includes the drawers arranged in the vertical direction, the base cabinet capable of slidably storing the drawers, the drive units arranged in the vertical direction in the rear parts of the drawers, and the plate-shaped longitudinal bracket erected with the drive units supported collectively, and the longitudinal bracket has the wiring gap between the upper end and the top plate of the base cabinet.
       

     Referring to the control device described in the Patent Document 6, the inner part of the storage box is divided into a plurality of portions, and the drawer shelf which is pulled out of the opening portion of the front surface of the storage box and can freely carry out storage is provided every divided box portion. The respective apparatuses are divided and disposed on the drawer shelves, and furthermore, the respective apparatuses are connected through separable connectors from each other and the external connector for relaying the input/output of the external device and the predetermined apparatus is provided on the wall surface of the storage box. Consequently, a mounting and wiring work in the apparatus can be carried out at the outside of the storage box. Furthermore, the work for wiring the apparatuses can be performed without time and labor after the storage of the drawer shelf. 
     Patent Document 1: Japanese Laid-Open Patent Publication No. 2007-330564 
     Patent Document 2: Japanese Laid-Open Patent Publication No. 1999-196943 
     Patent Document 3: Japanese Laid-Open Patent Publication No. 2003-259923 
     Patent Document 4: Japanese Laid-Open Patent Publication No. 2008-228763 
     Patent Document 5: Japanese Laid-Open Patent Publication No. 2009-50327 
     Patent Document 6: Japanese Laid-Open Patent Publication No. 1998-295007 
     DISCLOSURE OF THE INVENTION 
     Although the storage tools described in the Patent Documents 1 to 6 are devised to effectively utilize a saved space without any waste, to easily put in/out a thing to be stored, and to perform wiring in the storage of an electronic apparatus, however, it is impossible to configure a box for storing an electronic apparatus which functions as an anechoic chamber even if these devised techniques are combined with each other. 
     In other words, it is necessary to ensure the structure of the anechoic chamber isolated electrically while taking a measure against heat radiation for discharging, to an outside, heat generated from the electronic apparatuses stored in the storage box and devising the wiring which takes easiness of a work such as charging or maintenance into consideration. However, there is a problem in that this cannot be implemented even if the techniques described in the Patent Documents 1 to 6 are combined with each other. 
     The present invention has been made to solve the problem and has an object to provide a storage box capable of storing a large number of electronic apparatuses in a saved space and easily putting in/out them, and functioning as an anechoic chamber isolated electrically while taking a measure against heat radiation or devising wiring. 
     In order to attain the object, an anechoic chamber box for storing an electronic apparatus according to the present invention includes a storage container which is a housing on an outermost side and has a wall surface configured by a radio wave absorber, a plurality of storage racks stored side by side in a first direction in the storage container and having an opening portion in both forward and rearward directions of the first direction, a plurality of storage shelves provided with a division into a plurality of stages in the storage rack and enabled to be individually pulled out from the opening portion in the forward direction in the first direction, a wiring device provided in the storage rack and having a plurality of cables to be connected to a plurality of electronic apparatuses placed on the storage shelves, an air cooling fan provided on at least one of a wall surface in the forward direction and a wall surface in the rearward direction in the first direction of the storage container, and a duct provided on at least the other of the wall surface in the forward direction and the wall surface in the rearward direction in the first direction of the storage container, and when a door in the first direction of the storage container is opened, the storage racks are integrally pulled out in the first direction and at least one of the storage racks can be then slid individually in a second direction which is different from the first direction, and the storage racks have a wiring passage for wiring the cables to the storage shelves at inner side surfaces thereof, respectively. 
     According to the present invention having the structure described above, the storage racks stored in the storage container are pulled out in the first direction and the desirable storage rack is then slid in the second direction if necessary, and the desirable storage shelf is further pulled out in the first direction so that the electronic apparatus can be put in/out. Moreover, the cable to the electronic apparatuses placed on the storage shelves is wired from the wiring device via the wiring passage provided on the inner side surface of the storage rack. Therefore, the cable is not an obstacle when the storage racks are to be pulled out in the first direction, when the desirable storage rack is to be slid in the second direction and when the desirable storage shelf is to be pulled out in the first direction. Consequently, a large number of electronic apparatuses can be stored in a saved space in the storage container and a desirable one of the electronic apparatuses can easily be put in/out. 
     According to the present invention, furthermore, both of the forward direction and the rearward direction in the first direction of the storage rack are set to be the opening portions, and the air cooling fan is provided on at least one of the wall surface in the forward direction and the wall surface in the rearward direction in the first direction of the storage container storing the storage rack and the duct is provided on at least the other. Consequently, it is possible to form the ventilation passage linked to the outside from the wall surface in the forward direction of the storage container via the wall surface in the rearward direction for each of the storage shelves of the storage racks. Thus, it is possible to efficiently discharge heat generated from the electronic apparatus to the outside of the storage container. 
     Furthermore, the storage container itself is configured from a radio wave absorber. Therefore, the electronic apparatuses placed on the storage shelves in an inner part are electrically isolated so as not to be influenced by a radio wave sent from the outside and as to prevent leakage, to the outside, of the radio wave generated from the electronic apparatuses placed on the storage shelves in the inner part. Consequently, it is also possible to ensure a function of an anechoic chamber. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic view showing a state in which an anechoic chamber box for storing electronic apparatuses according to the present embodiment is seen from above (a state in which storage racks are stored in a storage container). 
         FIG. 2  is a schematic view showing a state in which the anechoic chamber box for storing electronic apparatuses according to the present embodiment is seen from above (a state in which the storage racks are pulled out of the storage container and a storage shelf is further pulled out of the storage rack). 
         FIG. 3  is a schematic view showing a state in which the anechoic chamber box for storing electronic apparatuses according to the present embodiment is seen from a side (a state in which the storage racks are pulled out of the storage container). 
         FIG. 4  is a view showing an example of a structure of ducts according to the present embodiment. 
         FIG. 5  is a view for explaining wiring in the storage container according to the present embodiment. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     An embodiment according to the present invention will be described below with reference to the drawings.  FIGS. 1 and 2  are schematic views showing an anechoic chamber box for storing electronic apparatuses according to the present embodiment as seen from above. Both of them virtually show a state in which an inner part is seen through from above.  FIG. 1  shows a state in which storage racks to be described below are stored in a storage container, and  FIG. 2  shows a state in which the storage racks are pulled out of the storage container and a storage shelf is further pulled out of the storage rack. It is assumed that a downward direction in the drawing indicates a front side and an upward direction in the drawing indicates a rear side. 
     Moreover,  FIG. 3  is a schematic view showing the anechoic chamber box for storing electronic apparatuses according to the present embodiment as seen from a side, illustrating the state in which the storage racks are pulled out of the storage container.  FIG. 3  virtually shows a state in which the inner part is seen through from a side. In  FIG. 3 , a rightward direction indicates a front side and a leftward direction indicates a rear side. 
     As shown in  FIGS. 1 to 3 , the anechoic chamber box for storing electronic apparatuses according to the present embodiment includes a storage container  10  to be a housing at an outermost side, a plurality of (two in the present embodiment) storage racks  20   -1  and  20   -2  stored side by side in a first direction (a longitudinal direction) in the storage container  10 , and a plurality of (ten in the present embodiment) storage shelves  31 - i  and  32 - i  (i=1, 2, . . . , 10) provided with a division into plural stages in the storage racks  20   -1  and  20   -2 . 
     Doors  11   a  and  11   b  are provided in forward and rearward directions of the storage container  10  respectively, and the doors  11   a  and  11   b  are provided with holding portions  12   a  and  12   b  and lock mechanisms  13   a  and  13   b  respectively. The storage container  10  is configured from a radio wave absorber using a radio wave absorbing material such as iron, nickel or ferrite. When the doors  11   a  and  11   b  are closed and are thus locked by the lock mechanisms  13   a  and  13   b , the electronic apparatuses (a smart phone, a tablet, a notebook PC or the like) stored in an inner part are electrically isolated so as not to be influenced by a radio wave sent from an outside and as to prevent a radio wave emitted from the electronic apparatuses from leaking to the outside. 
     As shown in  FIGS. 1 and 2 , a bottom surface of the storage container  10  includes a set of rails  14  which is provided in the first direction. On the other hand, as shown in  FIG. 3 , the storage racks  20   -1  and  20   -2  are provided side by side in a longitudinal direction over a single base table  21 . The base table  21  has a set of rails  26  to be engaged with the rails  14 , and can be slid in the longitudinal direction along the rails  14 . When the door  11   a  provided in the forward direction of the storage container  10  is opened, consequently, the storage racks  20   -1  and  20   -2  can be integrally pulled out in the forward direction. 
     As shown in  FIG. 3 , moreover, the base table  21  includes two sets of rails  22   -1  and  22   -2  which are provided in a second direction (a transverse direction) that is different from the first direction. On the other hand, the storage racks  20   -1  and  20   -2  have two sets of rails  27   -1  and  27   -2  to be engaged with the rails  22   -1  and  22   -2 . Consequently, the storage racks  20   -1  and  20   -2  can be slid in the transverse direction along the rails  22   -1  and  22   -2 . In other words, as shown in  FIG. 2 , the storage racks  20   -1  and  20   -2  are integrally pulled out in the forward direction and can be then slid individually in the leftward direction. 
     The storage racks  20   -1  and  20   -2  have an opening portion  23  provided in both the forward direction and the rearward direction. A plurality of storage shelves  31   -i  and  32   -i  provided on the storage racks  20   -1  and  20   -2  respectively can be individually pulled forward out of the opening portion  23  in the forward direction. One electronic apparatus or more can be placed on one of the storage shelves. For example, one electronic apparatus can be placed if the electronic apparatus is a notebook PC, and the electronic apparatuses can be placed on the single storage shelf if the electronic apparatuses are smart phones or tablets. 
     An illumination device  40  such as an LED is provided in a space between a wall surface of the door  11   b  provided in the rearward direction of the storage container  10  and the storage rack  20   -2 . This serves to enable verification as to whether camera photographing is carried out by electronic apparatuses through a remote operation without problems or not. For example, the illumination device  40  is configured from plural types of LEDs having various luminescence colors, and they are alternately turned ON or flashed. 
     A wireless access point  50  is provided on the wall surface of the door  11   b  disposed in the rearward direction of the storage container  10 . The wireless access point  50  is used in wireless communication of the electronic apparatuses placed on the storage shelves  31   -i  and  32   -i . The door  11   b  provided in the rearward direction of the storage container  10  can be opened when maintenance of the illumination device  40  or the wireless access point  50  or the like is performed. 
     An air cooling fan is provided on at least one of the wall surface of the door  11   a  disposed in the forward direction and the wall surface of the door  11   b  disposed in the rearward direction in the storage container  10 , and ducts are provided on at least the other wall surface.  FIG. 4  is a view showing an example of structures of the air cooling fan and the ducts.  FIG. 4( a )  is a front view showing the storage container  10  seen in the forward direction and  FIG. 4( b )  is a back view showing the storage container  10  seen in the rearward direction. 
     As shown in  FIG. 4 , in the present embodiment, two ducts  61   -1  and  61   -2  are provided on the door  11   a  in the forward direction of the storage container  10  and two ducts  62   -1  and  62   -2  are provided on the door  11   b  in the rearward direction. The two ducts  61   -1  and  61   -2  in the forward direction are provided at a regular interval in the vertical direction. On the other hand, the two ducts  62   -1  and  62   -2  in the rearward direction are provided at a regular interval in the transverse direction to keep away from a position in which the wireless access point  50  is disposed. 
     All of the four ducts  61   -1 ,  61   -2 ,  62   -1  and  62   -2  take a square sectional shape. One of them is a duct fan having a built-in exhaust fan. For example, the duct  62   -1  provided on the door  11   b  in the rearward direction of the storage container  10  is a duct fan including an exhaust fan, the residual duct  62   -2  is an exhaust duct, and the two ducts  61   -1  and  61   -2  provided on the door  11   a  in the forward direction function as intake ducts. 
     It is preferable that sizes of the ducts  61   -1 ,  61   -2 ,  62   -1  and  62   -2  should be set to be sizes other than integer times of wavelengths of radio waves emitted from the electronic apparatuses. For example, in the case in which wireless communication is performed by using a radio wave in a 2.4 GHz or 5 GHz band between the electronic apparatuses and the wireless access point  50 , a length of one of sides in each of the ducts  61   -1 ,  61   -2 ,  62   -1  and  62   -2  is designed so as not to be equal to the integer times of the wavelength which corresponds to the frequency. Consequently, the wavelengths of the radio waves emitted from the electronic apparatuses are not caused to be resonant with the sizes of the ducts  61   -1 ,  61   -2 ,  62   -1  and  62   -2 . Thus, it is possible to prevent the radio waves from leaking to the outside of the storage container  10  due to the resonance of the radio wave through the ducts  61   -1 ,  61   -2 ,  62   -1  and  62   -2 . 
       FIG. 5  is a view for explaining wiring in the storage container  10 .  FIG. 5( a )  is a schematic view showing the anechoic chamber box for storing electronic apparatuses according to the present embodiment as seen from a side, and  FIG. 5( b )  is a schematic view seen from a front (a forward direction).  FIG. 5( a )  virtually shows a state in which an inner part is seen through from the side. On the other hand,  FIG. 5( b )  shows an actual seen state from the front. The reference numeral  25  shown in  FIG. 5( b )  denotes a holding portion to be used in the pull-out of the storage racks  20   -1  and  20   -2  in the forward direction. 
     As shown in  FIG. 5 , a plurality of wiring devices  60  are provided in lowermost parts of the storage racks  20   -1  and  20   -2 , that is, lower parts of the storage shelves  31   -1  and  32   -1  in lowermost stages. The wiring devices  60  have a plurality of cables (for example, USB cables) to be connected to the electronic apparatuses placed on the storage shelves  31   -i  and  32   -i . Moreover, the wiring devices  60  may have a power cable or an LAN cable to the illumination device  40  and the wireless access point  50 . 
     A wiring for the power cable or the LAN cable from the outside of the storage container  10  to the wiring devices  60  on an inside is carried out through a hole (not shown) provided in one place of the door  11   b  in the rearward direction of the storage container  10 , for example. The hole is subjected to ground processing and radio wave shielding means for filling a gap by using a radio wave absorber utilizing a radio wave absorbing material. The power cable or the LAN cable to the illumination device  40  and the wireless access point  50  is not connected via the wiring devices  60  but may be directly connected via a separately provided hole. 
     Moreover, the storage racks  20   -1  and  20   -2  include wiring passages  24   -1  and  24   -2  for wiring the cables possessed by the wiring devices  60  to the storage shelves  31   -i  and  32   -i  at inside surfaces, respectively. As shown in  FIGS. 5( b )  and  1 , each of the wiring passages  24   -1  and  24   -2  is provided on each of both left and right side surfaces of each of the storage racks  20   -1  and  20   -2 . The wiring passages  24   -1  and  24   -2  are hollow and a hole (not shown) is formed in a position of each stage having the storage shelves  31   - , and  32   -i , and the cable can be led to the outside therefrom. 
     As shown in  FIG. 1 , moreover, holes  35   -i  and  36   -i  are formed on the storage shelves  31   -i  and  32   -i , respectively. The holes  35   -i  and  36   -i  serve to insert the cable passing through the wiring passages  24   -1  and  24   -2  therein. The cables led from the cavities of the wiring passages  24   -1  and  24   -2  to the outside via the holes in the respective stages are inserted through the holes  35   -i  and  36   -i  of the storage shelves  31   -i  and  32   -i  and are thus connected to terminala of the electronic apparatuses. 
     As described above in detail, according to the anechoic chamber box for storing electronic apparatuses in accordance with the present embodiment having the structure, the storage racks  20   -1  and  20   -2  stored in the storage container  10  are pulled out in the forward direction and a desired one of them is then slid in the leftward direction if necessary, and furthermore, a desired one of the storage shelves  31   -i  and  32   -i  is led out in the forward direction so that the electronic apparatuses can be put in/out. 
     Moreover, the cables to the electronic apparatuses placed on the storage shelves  31   -i  and  32   -i  are wired from the wiring devices  60  through the wiring passages  24   -1  and  24   -2  provided on the inside surfaces of the storage racks  20   -1  and  20   -2 . Therefore, the cables are not an obstacle when the storage racks  20   -1  and  20   -2  are led out in the forward direction, when the desirable storage rack  20   -1  or  20   -2  is slid in the leftward direction and when the desirable storage shelf  31   -i  or  32   -i  is pulled out in the forward direction. 
     As described above, according to the anechoic chamber box in accordance with the present embodiment, a large number of electronic apparatuses are stored in the saved space in the storage container  10  and a desirable one of the electronic apparatuses can easily be put in/out. 
     According to the anechoic chamber box in accordance with the present embodiment, moreover, the opening portions  23  are provided in both of the forward and rearward directions of the storage racks  20   -1  and  20   -2  and the exhaust duct fan  62   -1  is provided on the door  11   b  in the rearward direction in the storage container  10 , and furthermore, the intake and exhaust ducts  61   -1 ,  61   -2  and  62   -2  are provided on the door  11   a  in the forward direction and the door  11   b  in the rearward direction. Consequently, it is possible to form a ventilation passage linked to the outside from the wall surface in the forward direction of the storage container  10  via the wall surface in the rearward direction for each of the storage shelves  31   -i  and  32   -i  of the storage racks  20   -1  and  20   -2 . Thus, it is possible to efficiently discharge heat generated from the electronic apparatuses to the outside of the storage container  10 . 
     Furthermore, the storage container  10  itself is configured from the radio wave absorber and the electronic apparatuses placed on the storage shelves  31   -i  and  32   -i  in the inner part are electrically isolated so as not to be influenced by the radio wave sent from the outside and as to prevent leakage, to the outside, of the radio waves generated from the electronic apparatuses. Referring to the wiring of the cables to the electronic apparatuses placed on the storage shelves  31   -i  and  32   -i , moreover, a wiring portion from the outside of the storage container  10  to the inside thereof (the hole provided in one place on the door  11   b  in the rearward direction) is subjected to the radio wave shielding means so that the radio wave can be sufficiently prevented from leaking. In addition, all of the sizes of the ducts  61   -1 ,  61   -2 ,  62   -1  and  62   -2  formed for air cooling in the storage container  10  are set to be the sizes other than the integer times of the wavelengths of the radio waves emitted from the electronic apparatuses, and the radio waves are prevented from leaking to the outside of the storage container  10  due to amplification through the ducts  61   -1 ,  61   -2 ,  62   -1  and  62   -2 . Consequently, the anechoic chamber box according to the present embodiment can sufficiently exhibit the function of the anechoic chamber. 
     According to the anechoic chamber box in accordance with the present embodiment, thus, it is possible to store a large number of electronic apparatuses in a saved space and easily put them in/out and to function as an electrically isolated anechoic chamber while taking a measure against heat radiation and devising wiring. 
     Although the description has been given to the example in which two storage racks  20   -1  and  20   -2  and ten storage shelves  31   -i  and  32   -i  are provided in the embodiment, the numbers are only illustrative. 
     Although the description has been given to the example in which the rails  14  and  26  are provided as the structure for enabling the storage racks  20   -1  and  20   -2  to be moved in the forward direction and the rails  22   -1 ,  22   -2 ,  27   -1  and  27   -2  are provided as the structure for enabling the storage racks  20   -1  and  20   -2  to be moved in the leftward direction in the embodiment, moreover, the moving mechanism is not restricted to the structure in the present invention. 
     The description has been given to the structure for enabling both of the two storage racks  20   -1  and  20   -2  to be slid in the leftward direction in the embodiment, furthermore, the present invention is not restricted thereto. In other words, it is also possible to slide only one of them in the leftward direction. For example, the storage shelves  31   -i  provided in the storage rack  20   -1  in the forward direction can be pulled out in the forward direction even if the storage rack  20   -1  is not slid in the leftward direction. 
     Accordingly, it is also possible to have a structure in which only the storage rack  20   -2  in the rearward direction is slid in the leftward direction without having the structure in which the storage rack  20   -1  in the forward direction is slid in the leftward direction. To the contrary, it is also possible to have a structure in which only the storage rack  20   -1  in the forward direction is slid in the leftward direction without having the structure in which the storage rack  20   -2  in the rearward direction is slid in the leftward direction. The reason is that the storage shelves  31   -i  and  32   -i  can be pulled out in the forward direction from any of the storage racks  20   -1  and  20   -2  if the storage rack  20   -1  in the forward direction is slid in the leftward direction. 
     Moreover, it is possible to employ a structure in which at least one of the two storage racks  20   -1  and  20   -2  is pulled in an upward direction after they are moved in the forward direction. It is also possible to employ a structure in which the storage racks  20   -1  and  20   -2  are completely pulled out to be freely movable or a structure in which the storage racks  20   -1  and  20   -2  are pulled up by a predetermined height and can be locked so as not to fall by their dead loads in the case of the pull-up in the upward direction. 
     Although the description has been given to the example in which the illumination device  40  is provided in the space between the wall surface of the door  11   b  disposed in the rearward direction of the storage container  10  and the storage rack  20   -2  in the embodiment, moreover, the present invention is not restricted thereto. For example, it is also possible to provide the illumination device  40  in the space between the wall surface of the door  11   a  disposed in the forward direction of the storage container  10  and the storage rack  20   -1 . In this case, however, the door  11   b  in the rearward direction is opened to pull out the storage racks  20   -1  and  20   -2  in the rearward direction. 
     Although the description has been given to the example in which the exhaust duct fan  62   -1  is provided on the door  11   b  in the rearward direction and the intake and exhaust ducts  61   -1 ,  61   -2  and  62   -2  are provided on the door  11   a  in the forward direction and the door  11   b  in the rearward direction in the embodiment, moreover, the present invention is not restricted thereto. For instance, the position in which the duct fan is to be provided may be disposed on the door  11   a  side in the forward direction. Moreover, the number of the ducts is not restricted to four. For example, a single duct fan may be provided on one of the door  11   a  in the forward direction and the door  11   b  in the rearward direction, and one duct may be provided on the other. 
     In addition, the embodiment is only illustrative for concreteness to carry out the present invention and the technical scope of the present invention should not be thereby construed to be restrictive. In other words, the present invention can be carried out in various configurations without departing from the gist or main features thereof. 
     EXPLANATION OF DESIGNATION 
       10  storage container 
       11   a ,  11   b  door 
       20   -1 ,  20   -2  storage rack 
       23  opening portion 
       24   -1 ,  24   -2  wiring passage 
       31   -i ,  32   -i  storage shelf 
       35   -i ,  36   -i  hole provided on storage shelf 
       40  illumination device 
       50  wireless access point 
       60  wiring device