Patent Publication Number: US-2015070822-A1

Title: Electronic device and substrate container

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2013-189552, filed on Sep. 12, 2013, the entire contents of which are incorporated herein by reference. 
     FIELD 
     The embodiments discussed herein are related to an electronic device and a substrate container. 
     BACKGROUND 
     In some configurations, a backplane printed board assembly is adopted to receive a plurality of storage devices with threads leading out of an opening in a housing. 
     In the housing, into which a main substrate is to be inserted, if a connection substrate, to which the main substrate is to be connected, is located to a near side or a far side with respect to the direction in which the main substrate is inserted (insertion direction), the flow of cooling air in the insertion direction is subjected to resistance. 
     The following is a reference document.
     [Document 1] Japanese Laid-open Patent Publication No. 2013-45440.   

     SUMMARY 
     According to an aspect of the invention, an electronic device includes: a housing; a holder configured to support a first substrate and is inserted into the housing; a second substrate disposed in the housing, at a side with respect to a direction in which the holder is inserted; and a mechanism configured to move the first substrate in the direction with the second substrate and to connect the first substrate to the second substrate. 
     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 perspective view of an electronic device according to a first embodiment; 
         FIG. 2  is a front view of the electronic device according to the first embodiment; 
         FIG. 3A  is a perspective view of a substrate unit according to the first embodiment; 
         FIG. 3B  is a perspective view of the substrate unit according to the first embodiment; 
         FIG. 3C  is a perspective view of the substrate unit according to the first embodiment; 
         FIG. 4A  is a plan view of the inside of the substrate unit according to the first embodiment; 
         FIG. 4B  is a plan view of the inside of the substrate unit according to the first embodiment; 
         FIG. 4C  is a plan view of the inside of the substrate unit according to the first embodiment; 
         FIG. 5A  is a plan view of the electronic device according to the first embodiment; 
         FIG. 5B  is a plan view of the electronic device according to the first embodiment; 
         FIG. 5C  is a plan view of the electronic device according to the first embodiment; 
         FIG. 6  is a sectional view taken along line  6 - 6  in  FIG. 3A ; 
         FIG. 7A  is a perspective view of a substrate unit according to a second embodiment; 
         FIG. 7B  is a perspective view of the substrate unit according to the second embodiment; 
         FIG. 7C  is a perspective view of the substrate unit according to the second embodiment; 
         FIG. 8A  is a plan view of the inside of the substrate unit according to the second embodiment; 
         FIG. 8B  is a plan view of the inside of the substrate unit according to the second embodiment; 
         FIG. 8C  is a plan view of the inside of the substrate unit according to the second embodiment; and 
         FIG. 9  is a diagram of the substrate unit illustrated in  FIG. 8A , as viewed from an arrow 9 direction. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A first embodiment will be described in detail below with reference to the drawings. 
       FIGS. 1 and 2  illustrate an electronic device  12  according to a first embodiment.  FIGS. 3A to 3C  illustrate a substrate unit  18 . In each drawing, the front, width, and height directions of the electronic device  12  are denoted by arrows FR, W, and H, respectively. These directions are for ease of explanation, and not for limiting the directions in an actual use situation of the electronic device  12 . 
     As illustrated in  FIG. 1 , the electronic device  12  has a housing  16 . The housing  16  has insertion portions  14  into which the substrate units  18  are inserted in an arrow S1 direction and are accommodated. As illustrated, in particular, in  FIGS. 5A to 5C , the electronic device  12  according to this embodiment is configured such that the substrate units  18  are inserted from both the front side (i.e., left side in  FIG. 5A ) and the rear side (i.e., right side in  FIG. 5A ) of the housing  16 . In this embodiment, when the substrate units  18  are inserted into the housing  16 , the substrate units  18  on the front side are handled in front of the substrate units  18 , and the substrate units  18  on the rear side are handled behind the substrate units  18 . In the following description, the side at which the substrate units  18  are handled will be referred to as, simply, “near side”. The substrate units  18  to be inserted from the rear side may have a configuration in which, for example, the positions of members and parts thereof are inverted from those of the substrate units  18  to be inserted from the front side. 
     Furthermore, as illustrated in  FIG. 1 , in this embodiment, a plurality of (three, in the example in  FIG. 1 ) substrate units  18  are inserted into the housing  16  in the height direction. As mentioned above, because the substrate units  18  are inserted from both the front side and the rear side of the housing  16 , the total number of the substrate units  18  is six. Note that the number of the substrate units  18  may be one. 
     As illustrated in  FIGS. 3A to 3C , the substrate units  18  each support a main substrate  20 . The main substrate  20  carries electronic components  22 , such as various devices, as illustrated in  FIG. 2 . 
     The housing  16  accommodates a connection substrate  24 . The connection substrate  24  is disposed at a side of the substrate units  18  with respect to the insertion direction (arrow S1 direction). In the housing  16 , the main substrates  20  are electrically connected to the connection substrate  24  via connectors  26  and  28 . Note that the “side” includes either one or both of the right side and the left side with respect to the insertion direction of the substrate units  18 . For example, the connection substrate  24  is located on the left side with respect to the insertion direction of the substrate units  18  that are inserted from the near side in  FIG. 5A , whereas the connection substrate  24  is located on the right side with respect to the insertion direction of the substrate units  18  that are inserted from the far side. 
     The substrate units  18  each have a unit base  30  that supports the main substrate  20 . As illustrated in detail in  FIGS. 3A to 3C , the unit base  30  has a rectangular top plate  32  that is larger than the main substrate  20  in plan view and has a rectangular bottom plate  34  arranged parallel to the top plate  32 . 
     A pair of upright plates  36  is attached to the long sides of the top plate  32 . The main substrate  20  is supported between the upright plates  36 . As will be described below, in the housing  16 , the main substrate  20  slides sideways (in this embodiment, particularly in the perpendicular direction) with respect to the direction in which the substrate unit  18  is inserted into the housing  16  (i.e., arrow S1 direction); that is, the main substrate  20  slides in a direction in which the substrate unit  18  is connected to the connection substrate  24  (arrow S2 direction). 
     The upright plates  36  each have a rail groove  38  in their opposing faces. By fitting the edges of the main substrate  20  into the rail grooves  38 , the main substrate  20  may be slid without rattling. 
     The electronic device  12  has a moving mechanism  40 . In particular, in the first embodiment, the moving mechanism  40  has fixing pins  42  (see  FIG. 6 ) and a manipulation member  44  and is provided on the unit base  30 . This moving mechanism  40  enables the main substrate  20  to move (slide) sideways (in the arrow S2 direction in  FIGS. 3A to 3C ) and to be connected to the connection substrate  24  in the housing  16 . 
     The manipulation member  44  includes a link mechanism  46 , a grip  48 , and a conversion mechanism  50 . The link mechanism  46  is provided between the top plate  32  and the bottom plate  34 . 
     The link mechanism  46  according to the first embodiment includes, as illustrated in detail in  FIGS. 4A to 4C , a pair of first arms  52 A and  52 B. Ends of the first arms  52 A and  52 B are attached to the top plate  32  by shafts  54 A and  54 B, and the other ends of the first arms  52 A and  52 B are rotated about the shafts  54 A and  54 B. 
     When the first arm  52 A, located on the near side, is rotated about the shaft  54 A, the other end thereof changes its position between a projected position where it is projected to the near side from the unit base  30 , as illustrated in  FIGS. 3A and 4A , and a stored position where it is stored in the unit base  30 , as illustrated in  FIGS. 3C and 4C . 
     On the other hand, the first arm  52 B remains stored in the unit base  30  even when it is rotated about the shaft  54 B. 
     The shafts  54 A and  54 B are provided on the upstream side in the sliding direction of the main substrate  20  (arrow S2 direction). The pair of first arms  52 A and  52 B are coupled together by coupling arms  56  and  58  at their ends (i.e., the portions on the other side of the shaft  54 A) and middle portions, respectively, so, the first arms  52 A and  52 B remain parallel. 
     The link mechanism  46  further includes a pair of second arms  62 A and  62 B. Ends of the second arms  62 A and  62 B are attached to the middle portions of the first arms  52 A and  52 B by shafts  64 , and the other ends of the second arms  62 A and  62 B are rotatable. Fixing pins  42  are attached to the other ends of the second arms  62 A and  62 B. 
     The fixing pins  42  are an example of a fix member. In this embodiment, two fixing pins  42  in total are provided (i.e., one for the second arm  62 A and the other for the second arm  62 B). As illustrated in  FIG. 6 , the top plate  32  has elongated holes  66  extending in the sliding direction of the main substrates  20 , and the fixing pins  42  are accommodated therein. 
     The fixing pins  42  each have, at its top, a contact step portion  42 T that comes into contact with the lower surface of the main substrate  20 . The contact step portion  42 T is provided with a female screw  68 . The main substrate  20  is provided with a fixing hole  20 H. By inserting a male screw  70  through the fixing hole  20 H and screwing it into the female screw  68 , the fixing pin  42  is fixed to the main substrate  20 . Because there is a gap G between the main substrate  20  and the top plate  32 , the main substrate  20  and the top plate  32  do not rub each other when the main substrate  20  is slid, as will be described below. 
     Now, an angle θ, illustrated in  FIG. 4A , formed between a line segment LS- 1  extending between the shaft  64  and the shaft  54 A or  54 B and a line segment LS- 2  extending between the shaft  64  and the fixing pin  42  will be considered. The angle θ is an obtuse angle when the first arm  52 A is at a projected position. When the first arms  52 A and  52 B are rotated in the arrow R1direction, the angle θ increases, and the second arms  62 A and  62 B are rotated in the arrow R3 direction. 
     The fixing pins  42  are accommodated in the elongated holes  66 . Hence, the fixing pins  42  slide in the arrow S2 direction (sideways) as the first arms  52 A and  52 B are rotated in the arrow R1 direction. More specifically, the conversion mechanism  50  has the second arms  62 A and  62 B and the elongated holes  66 , and the second arms  62 A and  62 B serve as part of the link mechanism  46  and part of the conversion mechanism  50 . 
     Of the two first arms  52 A and  52 B, the first arm  52 A on the near side has a grip  48  at an end, which protrudes toward the near side of the first arm  52 A. The grip  48  makes it easy to rotate the first arm  52 A. 
     A lock member  72  that keeps the link mechanism  46  (first arm  52 A) accommodated inside the unit base  30  is attached to the upright plate  36  on the near side of the unit base  30 . The lock member  72  includes a plate-shaped lock plate  74  and a supporting shaft  76  that rotatably supports the lock plate  74  on the upright plate  36 . 
     As illustrated in  FIGS. 3A and 3B , in an orientation in which the lock plate  74  is rotated upward (i.e., non-lock orientation), the lock plate  74  is not positioned in the space between the top plate  32  and the bottom plate  34 . Hence, the first arm  52 A is able to pass through this space. On the other hand, in an orientation in which the lock plate  74  is rotated in an arrow R2 direction (i.e., lock orientation), as illustrated in  FIG. 3C , the lock plate  74  is positioned in the space between the top plate  32  and the bottom plate  34 . Therefore, the first arm  52 A stored inside the unit base  30  comes into contact with the lock plate  74  when rotated toward the outside of the unit base  30  (the direction opposite to the arrow R1 direction), and thus, the rotation thereof is restricted. 
     As illustrated in  FIGS. 2 and 5A  to  5 C, blower fans  78  are provided in the housing  16 . The blower fans  78  illustrated in  FIGS. 5A to 5C  are disposed in the middle of the housing  16  in the front-rear direction, that is, between the substrate units  18  to be inserted from the front side and the substrate units  18  to be inserted from the rear side. When driven, the blower fans  78  generate airflow in the front-rear direction (i.e., an arrow F1 direction or the opposite direction) in the housing  16 . 
     The blower fans  78  may be disposed at a position other than the middle of the housing  16  in the front-rear direction. For example, in a configuration in which the substrate units  18  are arranged only on the front side or only on the rear side in the housing, the depth of the housing may be reduced. In such a housing with a reduced depth, by arranging the blower fans  78  on the opposite side from the first arms  52 A of the substrate units  18 , a configuration in which the blower fans  78  are disposed on the rear side or the front side within the housing is achieved. 
     Although  FIG. 2  illustrates an example in which six blower fans  78  in total are arranged (i.e., two lows in the top-bottom direction and three rows in the width direction), the number and arrangement of the blower fans  78  are not limited thereto. 
     As illustrated in  FIGS. 5A to 5C , the housing  16  is provided with cover plates  80  on the front side and the rear side. In the example in  FIGS. 5A to 5C , the cover plates  80  are rotatable relative to the housing  16  due to hinges, thereby opening or closing the insertion portions  14 . The cover plates  80  are provided with ventilation openings so that the flow of air AF is not blocked. 
     Now, advantages of this embodiment will be explained. Before placing the main substrate  20  in the housing  16 , the main substrate  20  is supported by the unit base  30 . More specifically, the edges of the main substrate  20  are accommodated in the rail grooves  38 . Then, as illustrated in  FIG. 6 , the main substrate  20  is placed on the contact step portions  42 T of the fixing pins  42 , and the male screws  70  are inserted into the fixing holes  20 H and screwed into the female screws  68 . Thus, the fixing pins  42  and the main substrate  20  are fixed together. 
     Before placing the main substrate  20  in the housing  16 , as illustrated in  FIG. 5A , the unit base  30  is drawn out of the housing  16 . At this time, as illustrated in  FIGS. 3A and 4A , the first arm  52 A is disposed at the projected position. Furthermore, as illustrated in  FIG. 3A , the lock member  72  is in a non-lock orientation. 
     Then, the unit base  30  (substrate unit  18 ) supporting the main substrate  20  in this manner is moved in the arrow S1 direction, as illustrated in  FIGS. 1 and 5A , and is inserted into the insertion portion  14  of the housing  16 . 
     As illustrated in  FIG. 5B , the substrate unit  18  is inserted to a predetermined position of the housing  16 . Then, the grip  48  is pulled to rotate the first arm  52 A about the shaft  54 A in the arrow R1 direction. Because the first arms  52 A and  52 B are coupled together by the coupling arms  56  and  58 , the first arm  52 B is also rotated in the arrow R1 direction. Furthermore, the second arms  62 A and  62 B are rotated about the shafts  64  in the arrow R3 direction (see  FIG. 4B ). Then, the fixing pins  42  slide in the arrow S2 direction. 
     Because the grip  48  is located to the near side of the first arm  52 A (i.e., to the near side of the unit base  30  in the insertion direction), the grip  48  makes it easy to rotate the first arm  52 A. 
     Because the fixing pins  42  are fixed to the main substrate  20 , the main substrate  20  slides in the arrow S2 direction when the fixing pins  42  move in the arrow S2 direction. Because the edges of the main substrate  20  are accommodated in the rail grooves  38 , rattling of the main substrate  20  when slid in the arrow S2 direction is suppressed. 
     As illustrated in  FIG. 5C , by fitting the connectors  26  and  28  together, the main substrate  20  is electrically connected to the connection substrate  24 . 
     At this time, the first arm  52 A is at the stored position. The first arm  52 B and the second arms  62 A and  62 B are also stored inside the unit base  30 . Because the link mechanism  46  is fully accommodated in the unit base  30 , it does not interfere with anything. In a configuration in which part of the link mechanism  46  projects out of the unit base  30 , the cover plate  80  is provided at a position away from the unit base  30  to avoid interference with the link mechanism  46  when the cover plate  80  is closed. In contrast, in this embodiment, the cover plate  80  may be disposed at a position close to the unit base  30  inserted in the housing  16 . 
     Furthermore, the grip  48  is located inside the housing  16 . Hence, the grip  48  does not project outside the housing  16  and does not interfere with anything. 
     Moreover, as illustrated in  FIG. 3C , the first arm  52 A is kept accommodated in the unit base  30  by making the lock member  72  locked. Neither of the first arms  52 A and  52 B rotates in the direction opposite to the arrow R1 direction, and the fixing pins  42  do not slide in the direction opposite to the arrow S2 direction. Hence, it is possible to suppress unwanted detachment of the connectors  26  of the main substrate  20  from the connectors  28  of the connection substrate  24 . 
     In the above-described example, the plurality of substrate units  18  are inserted and stored in the housing  16 . Hence, the same operation is repeated for the number of substrate units  18 . 
     With the substrate units  18  being accommodated in the housing  16  and the main substrates  20  being connected to the connection substrate  24 , power supply from the connection substrate  24  to the main substrates  20  and signal transmission therebetween are performed. Furthermore, the main substrates  20  may be drawn out of the housing  16  for maintenance (inspection) or replacement. For example, maintenance or replacement of some substrate units  18  (main substrates  20 ) is possible without stopping the electronic device  12 . 
     Furthermore, by driving the blower fans  78 , a flow of air AF in the direction indicated by the arrow F1 in  FIG. 5C  (or in the opposite direction) is generated, cooling the electronic components  22  on the main substrates  20  (see  FIG. 2 ). 
     In this embodiment, as has been described above, the substrate units  18  are inserted into the housing  16 , and the main substrates  20  are moved sideways with respect to the insertion direction to be connected to the connection substrate  24 . The connection substrate  24  is disposed at a side with respect to the insertion direction (arrow S1 direction) in which the substrate units  18  are inserted into the housing  16 . Now, a configuration in which the connection substrate is disposed at the position of the blower fans  78 , illustrated in  FIGS. 5A to 5C , will be presented as a first comparative example. 
     In the configuration of the first comparative example, because the air AF blowing in the arrow F1 direction collides with the connection substrate from the front, the connection substrate serves as resistance to the flow of the air AF. In the configuration of the first comparative example, although it is possible to provide a hole in the connection substrate to allow the air AF to flow there through, such a hole has to be provided in the connection substrate while avoiding connectors and wires. Hence, the position and size of the hole is limited. 
     In contrast, in this embodiment, the connection substrate  24  is disposed at a side in the housing  16 , and the main substrates  20  are moved sideways to be connected to the connection substrate  24 . Because the air AF blowing in the arrow F1 direction does not collide with the connection substrate  24  from the front, ventilation resistance is low. 
     Now, another configuration will be presented as a second comparative example, in which the connection substrate is disposed at a side with respect to the insertion direction of the substrate unit and is configured such that it may be drawn toward the near side (front side or rear side). In the second comparative example, after the substrate unit is connected to the connection substrate drawn out of the housing, the connection substrate and the substrate unit are inserted into the housing. 
     In the configuration of the second comparative example, because the connection substrate is drawn out of the housing, power wires and signal wires leading to the connection substrate have to be extended correspondingly. That is, in the second comparative example, because the power wires and the signal wires leading to the connection substrate are extended, efficient power supply and high-speed signal transmission are difficult to achieve. 
     In contrast, in this embodiment, because the connection substrate  24  is not drawn out of the housing  16 , the power wires and the signal wires leading to the connection substrate  24  may be short. Hence, compared with the configuration of the second comparative example, efficient power supply and high-speed signal transmission are possible. 
     When the grip  48  is pulled to rotate the first arm  52 A in the direction opposite to the arrow R1 direction, because the fixing pins  42  are fixed to the main substrate  20 , the main substrate  20  slides in the direction opposite to the arrow S2 direction and is disconnected from the connection substrate  24 . Furthermore, by pulling the substrate unit  18  in the direction opposite to the insertion direction, the substrate unit  18  supporting the main substrate  20  may be drawn out of the housing  16 . 
     Next, a second embodiment will be explained. In the second embodiment, components and members that are the same as those in the first embodiment will be denoted by the same reference numerals, and detailed descriptions thereof will be omitted. Furthermore, a description of an electronic device according to the second embodiment will be omitted because it may have the same configuration as the electronic device  12  according to the first embodiment. 
     As illustrated in  FIGS. 7A to 7C , a substrate unit according to the second embodiment  82  has a third arm  84 , in addition to the configuration of the substrate unit  18  according to the first embodiment. The third arm  84  is attached to the top plate  32  at one end via a shaft  86  so as to be able to pivot. The other end of the third arm  84  moves between a projected position where it is projected out of the unit base  30  to the near side or far side, as illustrated in  FIGS. 7A and 8A , and a stored position where it is stored in the unit base  30  after rotated about the shaft  86 , as illustrated in  FIGS. 7C and 8C . 
     The shaft  86  is provided on the downstream side in the sliding direction of the main substrates  20  (arrow S2 direction). 
     As illustrated in detail in  FIG. 9 , a shaft  94  passing through the coupling arm  58  and the first arm  52 A in the top-bottom direction is provided at an intermediate position of the first arm  52 A in the longitudinal direction. A projection  88  is attached to each of the upper and lower ends of the shaft  94 . The third arm  84  has projection-accommodating grooves  90  that accommodate the projections  88  and extending in the longitudinal direction of the third arm  84 . 
     Hence, when the third arm  84  is rotated in an arrow R4 direction ( FIG. 8A ), the projections  88  slide in the projection-accommodating grooves  90  in an arrow S3 direction, causing the first arm  52 A to rotate in the arrow R1 direction. Conversely, when the third arm  84  is rotated in the direction opposite to the arrow R4 direction, the projections  88  slide in the projection-accommodating grooves  90  in the direction opposite to the arrow S3 direction, causing the first arm  52 A to rotate in the direction opposite to the arrow R1 direction. By making the projections  88  able to rotate about the shaft  94 , the friction occurring when the projections  88  slide in the projection-accommodating grooves  90  may be reduced by the rotation of the projections  88 . 
     A grip  92  is provided at an end of the third arm  84 . The grip  92  makes it easy to rotate the third arm  84 . 
     As has been described above, in the second embodiment, two grips,  48  and  92 , are provided. Either of the grips  48  and  92  enables the first arm  52 A to be rotated in the arrow R1 direction and the opposite direction. That is, with either of the grips  48  and  92 , the main substrate  20  may be slid in the arrow S2 direction and the opposite direction, thus making it easy to connect or disconnect the main substrate  20  to or from the connection substrate  24 . Furthermore, both of the grips  48  and  92  may be pulled to rotate the first arm  52 A. Hence, the force for moving the first arm  52 A is distributed, reducing the force applied to each grip. Moreover, the main substrate  20  may be stably slid in the arrow S2 direction and the opposite direction. 
     When the two grips  48  and  92  are to be provided to achieve stable sliding of the main substrate  20  in the arrow S2 direction and the opposite direction, for example, the two grips  48  and  92  may be provided only on the first arm  52 A. 
     In contrast, particularly in the second embodiment, not only simply the two grips  48  and  92  are provided, but the grips  48  and  92  are provided on the first arm  52 A and the third arm  84 , respectively, which are rotated in different directions when the main substrate  20  is slid in the arrow S1 direction. Because the shaft  54 A has rotational friction, when the first arm  52 A is rotated, a rotation moment in the arrow R1 direction is applied from the first arm  52 A to the unit base  30 . Because the shaft  86  also has rotational friction, when the third arm  84  is rotated, a rotation moment in the arrow R4 direction is applied from the third arm  84  to the unit base  30 . That is, because the rotation moments applied to the unit base  30  when the first arm  52 A and the third arm  84  are rotated act in the opposite directions, the moments are canceled out. Accordingly, by rotating both of the first arm  52 A and the third arm  84 , rotation of the unit base  30  that may occur when sliding the main substrate  20  in the arrow S2 direction is suppressed. 
     Although the configuration in which the manipulation member  44  includes the link mechanism  46 , the grip  48 , and the conversion mechanism  50  has been described, for example, a configuration in which the link mechanism  46  and the conversion mechanism  50  are not provided is also possible. That is, a configuration is possible in which links (i.e., members that pivot relative to the unit base  30 ), such as the first arm  52 A and  52 B and the second arms  62 A, are not provided and in which the grip  48  is slid in the arrow S2 direction and the opposite direction, causing the fixing pins  42  to directly move in the above-mentioned direction. By using the link mechanism  46  and the conversion mechanism  50 , rotational movement of the first arm  52 A may be easily converted into straight movement for sliding the main substrate  20 . 
     Moreover, as is seen from the example in  FIGS. 4A and 8A , the use of the link mechanism  46  increases the length between the shaft  54 A (center of rotation) and the grip  48  (operating portion) compared with the length between the shaft  54 A and the fixing pin  42 , allowing the main substrate  20  to slide with a small force. 
     Furthermore, a configuration without the grip  48  is also possible. When the first arm  52 A is rotated in the arrow R1 direction, the first arm  52 A may be directly pushed and rotated. Similarly, when the third arm  84  is rotated in the arrow R3 direction, the third arm  84  may be directly pushed and rotated. However, in a configuration with the grip  48 , the grip  48  makes manipulation easy when the first arm  52 A in the stored position is rotated in the direction opposite to the arrow R1 direction. 
     Furthermore, a configuration without the fix member (fixing pins  42 ) is possible. In a configuration without the fix member, for example, a pushing member may be used to slide the main substrate  20 . However, in a configuration in which the main substrate  20  is slid by pushing, a pushing member for sliding the main substrate  20  in the arrow S2 direction and another pushing member for sliding the main substrate  20  in the opposite direction have to be provided. In contrast, by fixing the fix member to the main substrate  20 , a force for movement may be applied from the fix member to the main substrate  20 , both in the arrow S2 direction and the opposite direction. 
     Beside the above-described fixing pins  42 , the fix member may be pinch members, such as clips, that are provided on the second arms  62 A and  62 B and are fixed by pinching the main substrate  20 . 
     As illustrated in  FIGS. 4A to 4C  and  8 A to  8 C, by providing the fix members at two positions in the direction perpendicular to the sliding direction, the main substrates  20  may be slid with less rattling, compared with a configuration in which the fix member is provided at one position. 
     In the above-described configuration, the moving mechanism  40  is provided on the unit base  30 . However, the moving mechanism  40  may be provided on the housing  16 . That is, a configuration is possible in which, after the unit base  30  supporting the main substrate  20  is inserted into the housing  16 , the moving mechanism  40  provided on the housing  16  is manipulated to slide the main substrate  20  in the arrow S2 direction so as to be electrically connected to the connection substrate  24 . In this way, by providing the moving mechanism  40  on the unit base  30 , the configuration of the housing  16  may be simplified. Furthermore, by using the unit base  30  compatible with various sizes and shapes of the main substrates  20 , it is easy to cope with various sizes and shapes of the main substrates  20 . 
     Although the electronic device  12  described above has a configuration in which the housing  16  accommodates a plurality of substrate units  18  arranged in the vertical direction, the housing  16  may accommodate only one substrate unit  18  in the vertical direction. However, by adopting a configuration in which the housing  16  accommodates a plurality of substrate units  18  arranged in the thickness direction, the space in the housing  16  is efficiently used. 
     Examples of the electronic device  12  include server devices and large computers, although not specifically limited thereto. For example, in the case of a server device, it is possible to realize a server device in which the main substrates  20  each function as a server and are connected to each other via the connection substrate  24 . 
     Furthermore, the electronic device is not limited to those for processing information, but may be, for example, a power supply device or the like that stably supplies power to another external device. Such a power supply device has, in the housing, a substrate unit provided with devices, such as a transducer, a capacitor, and an inverter. 
     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.