Abstract:
An electronic device has a first cabinet and a second cabinet. The second cabinet has a locking module including a hook, an operation member and a linking mechanism. The hook is formed at a position near a top end of the second cabinet around the center in the lateral direction in opened state, and is engaged with the first cabinet to lock the second cabinet in the closed state. The operation member disengages the hook from the first cabinet in response to operation. The linking mechanism links the operation to movement of disengaging the hook. The second cabinet further has a board mounted with a camera module having an image taking lens and an imaging device and a signal processing circuit for the camera module. The board is disposed at such a position that a portion in which the signal processing circuit is mounted overlaps with the linking mechanism.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to an electronic device having a first cabinet and a second cabinet that is supported via a pivot of the first cabinet so as to be opened and closed. 
         [0003]    2. Description of the Related Art 
         [0004]    A notebook personal computer (hereafter referred to as note PC) is formed by a main unit (a first cabinet) provided with a keyboard on a top surface thereof and a display unit (a second cabinet) provided with a display screen that can be opened and closed with respect to the main unit. Recently, such a note PC equipped with a camera at a position near the top edge of the display unit has started to become popular. The camera is intended for photographing a user&#39;s face and using the photographed image for communication via TV, telephone and the like. 
         [0005]    Further, a note PC is usually provided with locking mechanism that prevents the closed note PC from being unintentionally opened when the display unit is laid closed on the main unit. Examples of locking function include a hook disposed near the top edge of the display unit and an engaging hole formed in the main unit that receives the hook when the display unit is laid closed on the main unit. 
         [0006]    As portability is a requisite for a note PC, it is often the case that the note PC, while being carried, falls by being opened carelessly or hits an object. Accordingly, locking mechanism is provided to prevent unintentional disengagement of the display unit from the main unit. 
         [0007]    Here, it is preferable to dispose locking mechanism in approximately the center on side-to-side surface of the note PC for keeping balance of the note PC. The camera should also be disposed in around the center on the side-to-side surface so that when a user faces the front of the note PC the user&#39;s face directed to the display screen in the correct posture can be positioned around the center of field angle. 
         [0008]    However, a camera is usually fixed to a board mounted with signal processing circuits for the camera and locking mechanism is a locking module that includes, other than a locking hook, an operation member for disengaging the hook from the engaging hole, a linking mechanism linking operation of the operation member to disengaging movement of the hook. In addition, both the board for fixing the camera and the locking mechanism are not little in dimension. Thus, it is difficult to dispose the camera near the locking mechanism. 
         [0009]    Accordingly, when both the camera and the locking mechanism are installed in the note PC, either of the camera and the locking mechanism, due to insufficient space, should be placed close to the right or left side off the center of the top edge of the display unit, which is not favorable placement. 
         [0010]    Further, this problem is not limited to the note PC and is common to an electronic device with two cabinets that are configured to be opened and closed with respect to each other such as a PDA and a DVD. 
         [0011]    In this regard, Japanese Patent Application Publication No. 2000-20164 discloses a camera disposed at around the center, but a locking claw disclosed therein is disposed at a position close to the left side. Japanese Patent Application Publication No. 2002-55735 discloses a camera disposed at a position close to the right side and a locking claw disposed at a position close to the left side, both of which are disposed off the center. 
       SUMMARY OF THE INVENTION 
       [0012]    In view of the above circumstances, the present invention provides an electronic device with a first cabinet and a second cabinet that can be opened and closed with respect to the first cabinet in which a camera and a locking mechanism are disposed close to each other. 
         [0013]    An electronic device according to the present invention includes: 
         [0014]    a first cabinet; and 
         [0015]    a second cabinet that is supported via a pivot of the first cabinet and is capable of being closed in a closed state in which the second cabinet is closed to overlap with the first cabinet and is capable of being opened in an opened state in which the second cabinet is opened disengaged from the first cabinet, 
         [0016]    wherein the second cabinet comprises a locking module including a hook, an operation member and a linking mechanism, the hook being provided at a position near a top end of the second cabinet around the center in the lateral direction of the top end when the second cabinet is opened, the hook being engaged with the first cabinet to lock the second cabinet in the closed state, the operation member disengaging the hook from the first cabinet in response to operation, the linking mechanism linking the operation of the operation member to movement of disengaging the hook, and 
         [0017]    the second cabinet further comprises a board mounted with a camera module having an image taking lens and an imaging device and a signal processing circuit for the camera module, the board being disposed at such a position that a portion in which the signal processing circuit is mounted overlaps with the linking mechanism. 
         [0018]    Usually, a portion of the substrate for a camera in which a camera module is fixed requires considerable thickness for mounting a lens, an imaging device and the like. However, a portion of the substrate in which a signal processing circuit is mounted does not require a thickness much less than that of the portion for the camera module as signal processing circuit are mounted with small and short circuit elements. 
         [0019]    The present invention, focusing on the point, disposes the board at such a position that a portion in which the signal processing circuit is mounted overlaps with the linking mechanism forming the locking module. Accordingly, it is possible to dispose the hook for locking and the camera module at positions close to each other. 
         [0020]    Here, in the electronic device according to the invention, it is preferable that the operation member protrudes from a top end surface of the second cabinet in the opened state and is operated in response to disengaging locking of the second cabinet in the closed state, 
         [0021]    the hook protrudes from a surface, which faces the first cabinet, of the second cabinet, and 
         [0022]    the first cabinet has an engagement hole where the hook enters in the closed state. 
         [0023]    The hook and operation member forming the locking module are usually placed in the manner described above. 
         [0024]    In addition, the second cabinet may have a photographing window from which the camera module appears at a position beside the hook. 
         [0025]    According to the present invention, as the camera module can be placed close to the hook, the photographing window can be arranged at a position beside the hook. 
         [0026]    Additionally, a surface, on the side overlapping with the board, of the linking mechanism may be covered with a metal sheet. 
         [0027]    A board for a camera is usually mounted with a heat-generating component for signal processing. In that case, if the surface of the linking mechanism overlapping with the board is covered with a metal sheet, it is possible to disperse heat from the heat-generating component. In addition, the metal sheet is capable of serving as an electromagnetic shield and thus suppressing malfunction of the signal processing circuit. 
         [0028]    Further, it is preferable that the metal sheet is bent to extend over the surface on the side overlapping with the board and another surface next to and perpendicular to the surface. 
         [0029]    If the bent metal sheet is used, strength of the linking mechanism and its neighborhood is increased, which makes the electronic device thinner than a resin part having the same degree of strength. 
         [0030]    Preferably, the second cabinet is a cabinet of a display unit in which a display panel with a display screen for displaying information is incorporated with the display screen exposed, and 
         [0031]    the locking module and the board are disposed in a position above a top end of the display panel in the opened state of the second cabinet. 
         [0032]    Usually, a camera module should be placed at an upper position in a state in which the electronic device is opened and a locking module should also be disposed at an upper position that is away form the hinge for opening and closing the cabinet in a state in which the electronic device is opened. 
         [0033]    Preferably, the first cabinet is a cabinet of an arithmetic processing unit that incorporates an arithmetic circuit performing arithmetic processing and has a keyboard on a top surface thereof that inputs instructions according to operations. 
         [0034]    Accordingly, the present invention can be preferably applied to a note PC. 
         [0035]    As described above, the present invention can realize an electronic device in which a camera and a locking mechanism are disposed close to each other. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0036]      FIG. 1  is a perspective view showing the appearance of a notebook PC in an open condition; 
           [0037]      FIG. 2  is a perspective view showing the appearance of the notebook PC in an open condition; 
           [0038]      FIG. 3  is a perspective view showing the notebook PC in a closed condition; 
           [0039]      FIG. 4  is a perspective view showing the bottom surface side of the notebook PC in a closed condition; 
           [0040]      FIG. 5  is a diagram showing an enlarged upper middle part of the front of a display unit; 
           [0041]      FIG. 6  is a perspective view of a front frame covering the periphery of a display screen as viewed from the side of an inner wall surface of the front frame; 
           [0042]      FIG. 7  is an enlarged view showing the upper middle part of the inner wall surface of the front frame; 
           [0043]      FIG. 8  is an enlarged view showing an upper middle part of an outer wall surface of the front frame; 
           [0044]      FIG. 9  is an enlarged perspective view of the upper middle part of the inner wall surface of the front frame as obliquely viewed; 
           [0045]      FIG. 10  is a view of the upper middle part of a display unit from which the front frame was removed; 
           [0046]      FIG. 11  is a perspective view showing the interior of a cabinet on the bottom surface side after the removal of components on a top surface, such as a keyboard of a main unit; 
           [0047]      FIG. 12  is a diagram showing a part from which a CD/DVD drive unit was removed; 
           [0048]      FIG. 13  is a diagram showing a CD/DVD drive unit loading section in which a sheet is caused to extend by stripping adhesive tape; 
           [0049]      FIG. 14  is a partially enlarged view of a bottom surface of the main unit; 
           [0050]      FIG. 15  is a partial perspective view of a card slot portion of a part of the cabinet constituting the main unit on the bottom surface side, where a B-CAS card is to be inserted; 
           [0051]      FIG. 16  is a diagram showing a surface on the side where contacts of a card drive unit are disposed; 
           [0052]      FIG. 17  is a perspective view of a speaker holding section that is formed in the interior of the cabinet of the main unit; 
           [0053]      FIG. 18  is a perspective view of a vibrating surface of a speaker as obliquely viewed from above, showing the speaker and cushion members fixed to the speaker; 
           [0054]      FIG. 19  is a perspective view of the speaker and the cushion members as viewed from the rear surface side, which is a reverse side of the vibrating surface; 
           [0055]      FIG. 20  is a perspective view of the speaker and the cushion members as viewed from a side different from the side of  FIG. 19  on the rear surface side; 
           [0056]      FIG. 21  is a perspective view of a first cushion member; 
           [0057]      FIG. 22  is a diagram showing an HDD loading section  150  which is opened on the bottom surface of the main unit and into which a hard disk drive (HDD) unit is to be inserted; 
           [0058]      FIG. 23  is a perspective diagram showing the HDD unit disassembled into an HDD main body and a mounting metal fitting; 
           [0059]      FIG. 24  is a plan view showing the inner surface of the mounting metal fitting; 
           [0060]      FIG. 25  is a perspective view of the mounting metal fitting attached to the HDD main body, one side surface being viewed, with the front end surface positioned on the right-hand side; 
           [0061]      FIG. 26  is a perspective view of the mounting metal fitting attached to the HDD main body, the other side surface being viewed, with the front end surface positioned on the left-hand side; 
           [0062]      FIG. 27  is a perspective view of the mounting metal fitting attached to the HDD main body, as viewed from an angle at which an overview of the whole structure can be obtained; 
           [0063]      FIG. 28  is a view showing the HDD loading section from which the HDD unit is removed; 
           [0064]      FIG. 29  is a partially enlarged view of part of the HDD loading section; 
           [0065]      FIG. 30  is a diagram showing a shield plate that extends under a keyboard and the like constituting the top surface of the main unit, the keyboard and the like being removed; 
           [0066]      FIG. 31  is an enlarged diagram showing the area of the electronic part in  FIG. 30 ; 
           [0067]      FIGS. 32(A) to 32(C)  are diagrams of the same area of  FIG. 31 , showing an electronic part arrangement region where the electronic part is to be arranged, and the electronic part being removed; 
           [0068]      FIG. 33  is a perspective view of the electronic part arrangement region as obliquely viewed from above; 
           [0069]      FIG. 34  is an enlarged view of a front end portion of the electronic part arrangement region; 
           [0070]      FIG. 35  is a view showing the electronic part inserted obliquely into the electronic part arrangement region; and 
           [0071]      FIG. 36  is a view showing the inserted electronic part that is horizontally placed. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0072]    An embodiment of the present invention will be described below. The following description will be given of a notebook PC, which is an example of the electronic device of the present invention. 
       (General Configuration) 
       [0073]      FIGS. 1 and 2  are perspective views of the appearance of a notebook PC, showing an open condition as viewed from different directions.  FIG. 3  is a perspective view showing the notebook PC in a closed condition. And  FIG. 4  is a perspective view showing the bottom surface side of the notebook PC in a closed condition. 
         [0074]    This notebook PC  1  is composed of a main unit  10  and a display unit  20 , and the display unit  20  is connected so as to be able to open and close between a closed condition in which the display unit  20  is superposed on the main unit  10  (see  FIG. 3 ) and an open condition in which the display unit  20  is opened from the main unit  10  by a hinge portion  30  (see  FIGS. 1 and 2 ). 
         [0075]    The main unit  10  is provided, on the top surface thereof, with a keyboard  11  for inputting instructions responding to operations, a track pad  12  which is one kind of a pointing device that indicates any point on a display screen  21 , which will be described later, in response to operations, and an engaging hole  13  that a locking hook  221  enters. 
         [0076]    On the right and left front parts of this main unit  10 , sound releasing ports  14  that output sound from a built-in speaker to the outside are formed a little obliquely upward. 
         [0077]    Furthermore, on the right side surface of this main unit  10 , as shown in  FIG. 1 , a power supply input terminal  15  for external power supply connection and other multiple connectors and the like are arranged and on the left side surface, as shown in  FIG. 2 , there is exposed a surface of a CD/DVD drive unit  16 , which drives a loaded medium such as a CD and a DVD. In a position in superposed relation with this CD/DVD drive unit  16  on the left side surface in the thickness direction, there is formed a card slot into which a B-CAS card (a BS-conditional access systems card) is to be inserted, which is not illustrated here (which will be described later). 
         [0078]    A CPU and many other electronic parts are built in this main unit  10 , and various kinds of arithmetic processing are performed by executing programs. 
         [0079]    The display unit  20  has, on the front surface thereof, a display screen  21  for information display that constitutes a display panel, and the periphery of the display screen  21  is covered with a front frame  26 . A hook  221  for locking protrudes from the front frame  26  in a position above a top edge of the display screen  21  of the front of the display unit  20 . This hook  221  enters the engaging hole  13  on the top surface of the main unit  10  when the display unit  20  is closed on the main unit  10 , and is locked within the engaging hole  13  so that the display unit  20  does not open accidentally from the main unit  10 . 
         [0080]    Upon the top end surface of this display unit  20  is arranged an operating element  222  for unlocking, and when this operating element  222  is depressed, the hook  221  moves in the unlocking direction. By depressing this operating element  222  when the display unit  20  is in the closed condition shown in  FIG. 3 , the hook  221  is released from the engaging hole  13  and the display unit  20  can be opened. 
         [0081]    A photographing window  23  from which a lens of a camera module, which will be described later, makes an appearance, is provided in a position of the display unit  20  above the top edge of the display screen  21  and in side-by-side relation with the hook  221 . This photographing window  23  is constructed in such a manner that the front surface of a hole provided in the cabinet where the camera module is to be disposed is covered with a transparent acrylic plate or the like. Furthermore, an infrared receiving window  24  for infrared communication is formed beside this photographing window  23 . 
         [0082]    Furthermore, as shown in  FIG. 4 , upon the bottom surface of the main unit  10 , as components necessary for later descriptions, there are disposed a card housing section  18  that houses a B-CAS card  41 , which is inserted from a card slot  17  so as to be capable of being inserted and extracted, and a lid  19  that covers an HDD housing section in which a hard disk drive (hereinafter called HDD) unit is loaded. 
       (Superstructure of Display Unit) 
       [0083]      FIG. 5  is a diagram showing an enlarged upper middle part of the front of the display unit. 
         [0084]    In a position above the top edge of the display screen  21 , the hook  221  for locking protrudes to the front of the display unit  20 , and the top end surface of the display screen  21  is provided with the operating element  222  for unlocking in a protruding condition. The photographing window  23  from which a lens of a camera module, which will be described later, makes an appearance, is formed in a position of the front of the display unit  20  adjacent to the hook  221 . This photographing window  23  is covered with a transparent acrylic plate or the like. Furthermore, the infrared receiving window  24  is also provided beside this photographing window  23 . 
         [0085]    Furthermore, pads  25  that hide screw heads used in screwing the front frame constituting the display unit  20  are seen here. 
         [0086]      FIG. 6  is a perspective view of the front frame covering the periphery of the display screen  21  as viewed from the side of an inner wall surface of the front frame.  FIG. 7  is an enlarged view showing an upper middle part of the inner wall surface of the front frame  26 . And  FIG. 8  is an enlarged view showing an upper middle part of the outer wall surface of the front frame  26 . 
         [0087]    This front frame  26  is a member that forms the front of the display unit  20  (see  FIGS. 1 and 2 ) at the periphery of the display screen  21  in such a manner that the display screen  21  is exposed from an opening  261  in the middle of the front frame  26 . 
         [0088]    In the upper middle part of the inner wall surface of this front frame, there is provided, in addition to the hook  221  (see  FIG. 8 ) and the operating element  222 , a lock module  22  having a connecting mechanism section  223  that transmits the operation of the operating element  222  to the hook  221 . This connecting mechanism section  223  assumes the role of transmitting the operation to the operating element  222  as an action of disengagement of the hook  221 . 
         [0089]    On the right-hand part of this lock module  22  in  FIG. 7  (on the left-hand part in  FIG. 8 ), there is formed a lens loading hole  262  leading to the photographing window  23  into which a lens of the camera module is loaded. 
         [0090]      FIG. 9  is an enlarged perspective view of the upper middle part of the inner wall surface of the front frame as obliquely viewed. 
         [0091]    As is apparent from  FIG. 9 , the connecting mechanism section  223  that constitutes the lock module  22  is covered with a metal plate  2231  bent in the form of the letter L so that the metal plate  2231  extends into a surface  223   a  in superposed relation with a substrate, which will be described later, and a surface  223   b  perpendicular to this surface  223   a.    
         [0092]    This L-shaped metal plate  2231  has the roles of both ensuring the strength of this connecting mechanism section  223  and cooling a heat-generating electronic part mounted on a substrate, which will be described later. 
         [0093]      FIG. 10  is a view of the upper middle part of the display unit from which the front frame was removed. 
         [0094]    In this part, the camera module  271  is fixed and furthermore, there is disposed a substrate  27  on which a large number of electronic parts  272  that constitute a signal processing circuit for this camera module  271  are mounted. The signal processing circuit on this substrate  27  is electrically connected to the outside of this substrate via a connector  273 . 
         [0095]    One electronic part  272   a  belonging to the many electronic parts  272  that constitute this signal processing circuit is a heat-generating electronic part that generates considerable heat during operation. 
         [0096]    When the front frame  26  shown in  FIG. 6  is attached, the camera module  271  is inserted into the lens loading hole  262  (see  FIG. 9 ) and a lens makes an appearance from the photographing window  23  (see  FIG. 8 ). Also, the region of the substrate  27  where the electronic parts  272  are mounted is disposed in a position in superposed relation with the connecting mechanism section  223  of the lock module  22 . At this time, the L-shaped metal plate  223  shown in  FIG. 9  approaches the electronic parts  272  on the substrate  27  and is disposed so as to cover these electronic parts  272 . As a result of this, the L-shaped metal plate  223  assists the heat-generating electronic part  272   a  in the heat release thereof and serves also as a shield for these electronic parts  272 . 
         [0097]    In this embodiment, as described above, the connecting mechanism section  223  and the substrate  27  are disposed in a position in superposed relation in the thickness direction and, therefore, the hook  221  constituting the lock module  22  and the photographing window  23  are disposed in positions close to each other in the upper middle part of the display unit  20 . 
       (Card Access Unit) 
       [0098]      FIG. 11  is a perspective view showing the interior of the cabinet on the bottom surface side after the removal of components on the top surface, such as the keyboard  11  of the main unit  10 . 
         [0099]    A large number of electronic parts are mounted within the cabinet on the bottom surface side that constitutes the main unit  10 . A CD/DVD drive unit  51  is mounted here as one of these electronic parts. 
         [0100]      FIG. 12  is a diagram showing a part from which the CD/DVD drive unit  51  was removed. 
         [0101]    The CD/DVD drive unit  51  shown in  FIG. 11  is an electronic part that is loaded into a CD/DVD drive unit loading section  511  from an electronic part loading port  101  provided in the cabinet constituting the main unit  10  so as to be capable of being loaded and unloaded. Once the CD/DVD drive unit  51  has been loaded, the CD/DVD drive unit  51  is not removed during ordinary use. However, in case of failure and the like, the CD/DVD drive unit  51  can be removed from the electronic part loading port  101 . This CD/DVD drive unit  51 , as loaded from the electronic part loading port  101 , stops up the opening of the electronic part loading port  101 , and the surface of the CD/DVD drive unit  51  forms part of the cabinet defining the outside shape of the main unit  10 . 
         [0102]    A shield plate  102  is laid on the CD/DVD drive unit loading section  511 , and the CD/DVD drive unit  51  that is loaded from the electronic part loading port  101  is placed on this shield plate  102 . 
         [0103]    Upon this shield plate  102 , an insulating sheet  103  is laid and is stuck with adhesive tape  104 . 
         [0104]      FIG. 13  is a diagram showing the CD/DVD drive unit loading section  511  in which the sheet  103  is caused to extend by stripping the adhesive tape  104 . 
         [0105]    An opening  102   a  is formed in the shield plate  102 , and a card access unit  52  is disposed in a position inside this opening  102   a.    
         [0106]    A flat cable  53  that connects two circuit boards extends over the shield plate  101 . 
         [0107]    The sheet  103  has a fixed portion  103   a  that is fixed to the shield plate  102  and a folded-back portion  103   b  that is folded back in a position near the electronic part loading port  101  and extends on the fixed portion  103   a . When the folded-back portion  103   b  is folded back (see  FIG. 12 ), the flat cable  53  becomes sandwiched between the fixed portion  103   a  and folded-back portion  103   b  of the sheet  103 , and the opening  102   a  of the shield plate  102  and the card access unit  52  become covered with the folded-back portion  103   b . Therefore, during loading and unloading, the CD/DVD drive unit  51  can be smoothly loaded and unloaded without damage or break by being caught in the edge of the opening  102   a  of the shield plate  102 , the card access unit  52  and the flat cable  53 . 
         [0108]      FIG. 14  is a partially enlarged view of the bottom surface of the main unit  10 . 
         [0109]    Upon this bottom surface, also as shown in  FIG. 4 , there is formed the card housing section  18  that houses the B-CAS card  41 , which is inserted from the card slot  17 , which is formed in one end surface of the cabinet of the main unit  10 , so as to be capable of being inserted and extracted. 
         [0110]      FIG. 15  is a partial perspective view of a card slot portion of a part of the cabinet constituting the main unit on the bottom surface side, where the B-CAS card is to be inserted. 
         [0111]    As shown in  FIG. 15 , this card slot  17  is formed in a position in superposed relation with the electronic part loading port  101  (see also  FIG. 12 ), into which the CD/DVD drive unit is to be loaded, in the thickness direction of the main unit  10 , and the card housing section  18  is formed in a position in superposed relation with the CD/DVD drive unit loading section  511 , into which the CD/DVD drive unit  51  is to be loaded. 
         [0112]      FIG. 16  is a diagram showing a surface on the side where contacts of the card access unit  52  are disposed (in this embodiment, this surface is called an inner surface). 
         [0113]    Upon this surface, multiple contacts  521  are provided. In the B-CAS card  41  inserted from the card slot  17 , electrodes (not shown) are formed in places corresponding to these contacts  521  on the front end side of the insertion direction of the B-CAS card  41 , and the B-CAS card  41  inserted from the card slot  17  abuts against a positioning wall  522  and stops. In this condition, the contacts  521  come into contact with the electrodes of the B-CAS card  41 , and the B-CAS card  41  is accessed by this card access unit  52  via the contacts  521 . 
         [0114]    The rear surface on the back side of the inner surface of this card access unit  52  shown in  FIG. 16  enters the opening  102   a  of the shield plate  102  shown in  FIG. 13 . As is apparent from  FIG. 13 , this card access unit  52  is fixed in a position that is spaced from the card slot  17  within the cabinet of the main unit  10  and a little back, and the B-CAS card  41  inserted from the card slot  17  is inserted into a position where only the leading end portion thereof is superposed on the card access unit  52 . 
         [0115]    Because the card access unit  52  is provided in a position spaced from the card slot  17  and a little back, it is necessary for the card access unit  52  to correctly guide the B-CAS card  41  inserted from the card slot  17  toward the card access unit  52 . In this embodiment, the shield plate  102  laid under the CD/DVD drive unit  51  has a stepped form for guiding a card. Thus, it is possible to correctly guide the B-CAS card  41  inserted from the card slot  17  to the card access unit  52  by the shield plate  102  in conjunction with the inner wall of the card housing section  18  of the cabinet on the bottom surface side of the main unit  10 . In this embodiment, therefore, it is unnecessary to arrange excess parts for guiding the card, because the shield plate  102 , which is necessary from the beginning, is used as a guide plate. Accordingly, as the card is guided by the shield plate  102  in conjunction with the cabinet, the guiding function is realized without a cost rise due to an increase in the number of parts and an increase in size. 
         [0116]    The card access unit  52  is disposed in such a manner that the inner surface thereof shown in  FIG. 16  directly faces the inner surface of the cabinet on the bottom surface side of the main unit  10 . Usually, such a card access unit  52  is provided with another plate member that faces this inner surface so as to surround the B-CAS card  41  in conjunction with the inner surface shown in  FIG. 16 . In this embodiment, however, such a plate member is unnecessary and the B-CAS card  41  inserted into the card access unit  52  is surrounded by the inner surface of the card access unit  52  shown in  FIG. 16  and the inner wall surface of the cabinet. Therefore, this embodiment contributes to thin designs by saving such a plate member. 
         [0117]    Furthermore, as shown in  FIG. 13 , the opening  102   a  is formed in the shield plate  102 , and the card access unit  52  is disposed in such a manner that the rear surface side thereof enters the opening  102   a.    
         [0118]    Therefore, in this embodiment, it is also possible to make the thickness of the shield plate  102  thinner. 
         [0119]    Incidentally, in the above-described embodiment, the CD/DVD drive, the shield plate, the card slot unit, and the bottom surface of the cabinet of the main unit are stacked in this order from above and, therefore, the description was given of the case where a card is guided by the shield plate  102  in conjunction with the bottom surface of the cabinet of the main unit. However, in the case where the card slot unit is provided near the top surface of the cabinet of the main unit with a reverse stacking structure, as opposed to this embodiment, it is needless to say that a card may be guided by the shield plate in conjunction with the top surface of the cabinet of the main unit. 
       (Speaker) 
       [0120]      FIG. 17  is a perspective view of a speaker holding section that is formed in the interior of the cabinet of the main unit  10 . 
         [0121]    This speaker holding section  140  is provided on the inner side of the sound releasing ports  14  that output sound from the built-in speaker, which are shown in  FIGS. 1 to 3 . The sound releasing port  14  is provided in quantities of two in total, one for each of the right- and left-hand parts of the front of the main unit  10 . Also the speaker holding section  140  is provided for each of the two sound releasing ports  14  and the right and left speaker holding sections have almost the same structure. Only one of the two sound releasing ports  14  is shown in  FIG. 17 . 
         [0122]    This speaker holding section  140  has a pair of side guides  141   a ,  141   b  that guide both side surfaces of the speaker, a pedestal  142  on which the undersurface of the speaker is placed, and a back  143  that supports the rear surface of the speaker. 
         [0123]      FIG. 18  is a perspective view of a vibrating surface  551  of a speaker  55  as obliquely viewed from above, showing the speaker  55  and cushion members  56 , 57 , 58  fixed to the speaker.  FIG. 19  is a perspective view of the speaker  55  and the cushion members  56 , 57 , 58  as viewed from the rear surface side, which is a reverse side of the vibrating surface  551 .  FIG. 20  is a perspective view of the speaker  55  and the cushion members  56 , 57 , 58  as viewed from a side different from the side of  FIG. 19  on the rear surface side. And  FIG. 21  is a perspective view of a first cushion member  56 . 
         [0124]    As shown in  FIG. 18 , the vibrating surface  551  of this speaker  55  is oval, but the surface enclosing the vibrating surface  551  on the side of this vibrating surface  551  is rectangular as a whole. 
         [0125]    A first cushion member  56  having the shape as shown in  FIG. 21  is disposed on the right and left side surfaces of this rectangular speaker  55 , a second cushion member  57  is disposed on the undersurface of the speaker  55 , and a third cushion member  58  is disposed on the rear surface of the speaker  55 . 
         [0126]    The first cushion member  56  of  FIG. 21  disposed on the right and left side surfaces of this rectangular speaker  55  is formed in one piece which a pair of fixed portions  561  disposed on the right and left side surfaces of the speaker  55  is connected so as to pass over the top surface of the speaker  55 . As a result of this, a reduction in the number of parts and a cost reduction are achieved compared to a case where the right and left fixed portions  561  are separate parts. 
         [0127]    In each of the right and left fixed portions  561  of this first cushion member  56 , there is formed an insertion portion  562  into which each of the right and left side surfaces of the speaker  55  is to be inserted. This first cushion member  56  is attached to the speaker  55  by the insertion of the right and left side surfaces of the speaker  55  into the right and left insertion portions  562 . 
         [0128]    This first cushion member  56  is formed from a relatively hard material, such as hard rubber, and hence this first cushion member  56  can be fixed to the speaker  55  simply by inserting the sides of the speaker  55  into the insertion portions  562 . 
         [0129]    The side guides  141   a ,  141   b  of the speaker holding section  140  provided in the cabinet are intended for guiding the side surfaces of the speaker  55  to which the first cushion member  56  is attached, and the first cushion member  56  is configured to hold the speaker  55  in an upward condition such that the vibrating surface  551  of the speaker  55  is directed to the sound releasing port  14  when the speaker  55  with this first cushion member  56  attached thereto is inserted in the side guides  141   a ,  141   b . Thus, this first cushion member  56  is formed from a hard material and has also the role of holding the posture of the speaker  55 . 
         [0130]    The second cushion member  57  disposed on the undersurface of the speaker  55  is formed from a material that is softer than the material for the first cushion member  56 . For this reason, it is impossible to adopt a fixing method that involves fixing by insertion into the undersurface of the speaker  55  as with the material for the first cushion member  56 , and this second cushion member  57  is fixed to the undersurface of the speaker  55  by adhesion. This second cushion member  57  has an adhesive layer also on the surface on the pedestal  142  side of the speaker holding section  140 , and the second cushion member  57  is made to adhere also to the pedestal  142  when the speaker  55  is disposed in the speaker holding section  140 . For this reason, it is possible to prevent, during assembling, the speaker  55  disposed in the speaker holding section  140  from falling off, which eliminates the need of rearrangement of the fallen speaker  55  as well as prevents the occurrence of poor assembling and the like. 
         [0131]    Also the third cushion member  58  disposed on the rear surface of the speaker  55  is formed from a material softer than the material for the first cushion member  56  and made to adhere to the rear surface of the speaker  55 . 
         [0132]    In this embodiment, as described above, the soft cushion members  57 ,  58  are respectively disposed on the undersurface and rear surface of the speaker  55 , and the speaker  55  with the cushion members  56 , 57 , 58  is disposed in the speaker holding section  140 . Thus, transmission of the vibration of the speaker  140  to the cabinet of the main unit  10  is substantially reduced. For this reason, even if the speaker  140  is caused to sound at a great sound volume, it is possible to suppress the influence on the electronic parts of the vibration-sensitive hard disk drive (HDD) unit and the like, which are provided within the cabinet of the main unit  10 . 
       (Mounting Structure of Hard Disk Drive Unit (HDD)) 
       [0133]      FIG. 22  is a diagram showing an HDD loading section  150  which is opened on the bottom surface of the main unit and into which a hard disk drive unit (HDD) is to be inserted. 
         [0134]      FIG. 22  shows a condition in which the lid  19  covering the HDD loading section  150  is removed, the HDD loading section  150  having an opening in the bottom surface of the main unit  10  and having a scraped-out shape. 
         [0135]    The HDD unit  60  is disposed in the HDD loading section  150 . This HDD unit  60  is composed of an HDD main body  61  and a mounting metal fitting  62  for mounting this HDD main body  61  to the cabinet of the main unit  10 . This HDD unit  60  is screwed to the cabinet with the aid of holes  621   a  provided in the mounting metal fitting  62 . In  FIG. 22  is shown a condition in which screws in the holes  621   a  have been removed. 
         [0136]      FIG. 23  is a perspective diagram showing the HDD unit that is disassembled into the HDD main body  61  and the mounting metal fitting  62 , and  FIG. 24  is a plan view showing the inner surface of the mounting metal fitting  62 . 
         [0137]    In  FIG. 23 , an undersurface  615  of the HDD main body  61  and an inner surface  622   a  of a base portion of the mounting metal fitting  62  are shown in such a manner as to be exposed. 
         [0138]    This HDD main body  61  is an electronic part in the shape of a flat rectangular parallelepiped having a front end surface  611 , a rear end surface  612 , two right and left side surfaces  613 , a top surface  614  (facing downward in  FIG. 23 ), which is defined by the front end surface  611 , the rear end surface  612 , and the two side surfaces  613 , and an undersurface  615  (facing upward in  FIG. 23 ). In this embodiment, as shown in  FIG. 27 , a connector  611   a  is provided in the front end surface  611 . 
         [0139]    The HDD main body  61  is disposed on the mounting metal fitting  62  so that the top surface  614  thereof faces the inner surface  622   a  of the base portion of the mounting metal fitting  62 . At this time, a cushion member  631  is disposed on the inner surface  622   a  of the mounting metal fitting  62  so that the top surface  614  of the HDD main body  61  does not directly strike the inner surface  622   a  of the mounting metal fitting  62 . This cushion member  631  is disposed in a position on the inner surface  622   a  of the mounting metal fitting  62  where a part of the top surface  614  of the HDD main body  61  near the rear end surface side comes into contact. However, on the front end surface side of the HDD main body  61 , with the aid of a screw insertion hole  627  of the mounting metal fitting  62  and a screw hole  616  of the HDD main body  61 , the mounting metal fitting  62  is screwed to the HDD main body  61  so that a part of the top surface  614  of the HDD main body  61  near the front end surface  611  does not come into direct contact with the inner surface  622   a  of the mounting metal fitting  62 , either. 
         [0140]    Also for the side surfaces, in the mounting metal fitting  62 , there are disposed cushion members  632  that come into contact with the two side surfaces  613  of the HDD main body  61  at positions near the rear end surface  612 . No cushion member is disposed on the side surfaces  613  of the HDD main body  61  at positions near the front end surface  612 , because the mounting metal fitting  62  is screwed at these positions. 
         [0141]    A cushion member  633  is disposed also on the outer side of the mounting metal fitting  62 , such that the mounting metal fitting  62  is interposed between the cushion members  632  and  633 . This cushion member  633  on the outer side is placed between the mounting metal fitting  62  and an inner wall of the HDD loading section  150  when the HDD unit  60  in which this mounting metal fitting  62  is attached to the HDD main body  61  is loaded into the HDD loading section  150  (see  FIG. 22 ). 
         [0142]      FIGS. 25 and 26  are perspective views of the mounting metal fitting attached to the HDD main body, showing one side surface and the other side surface respectively, as viewed with the front end surface of the mounting metal fitting positioned on the right-hand side and on the left-hand side of the drawings, respectively.  FIG. 27  is a perspective view of the mounting metal fitting attached to the HDD main body, as viewed from an angle at which an overview of the whole structure can be obtained. 
         [0143]    This mounting metal fitting  62  is formed by sheet. metal working. The mounting metal fitting  62  has a base portion  622  that extends to cover the top surface  614  of the HDD main body  61 , and a pair of right and left side surface supporting portions  623  that are bent and extend respectively along the two side surfaces  613  of the HDD main body from the base portion  622 . The right and left side surface supporting portions  623  each branch into a front end side surface supporting portion  623   a  and a rear end side surface supporting portion  623   b.    
         [0144]    The front end side surface supporting portion  623   a  is connected to the base portion  622 , and has a bent portion  623 _ 1   a  that is bent from this base portion  622  along the side surface  613  of the HDD main body  61  and an arm portion  623 _ 2   a  that is separated from the base portion  622 , connected to the bent portion  623 _ 1   a , extends along the side surface  613  of the HDD main body  61  to the front end surface  611  side, extends up to a corner where the side surface  613  of the HDD main body  61  meets the front end surface  611  thereof, and is further bent to the front end surface  611  side so as to cover the end portion of the front end surface  611 . The screw insertion hole  627  for screwing (see  FIG. 23 ) is provided in this arm portion  623 _ 2   a , and the arm portion  623 _ 2   a  is fixed to the HDD main body  61  by use of a screw member  42 . 
         [0145]    In a position closer to the rear end surface  612  of the HDD main body  61  than the front end side surface supporting portion  623   a , the rear end surface side side-supporting portion  623   b  is connected to the base portion  622  independently of the front end side surface supporting portion  623   a , and is bent from the base portion  622  along the side surface  613  of the HDD main body  61  and expands along the side surface  613 . Upon an inner surface of this rear end surface side side-supporting portion  623   b , there is disposed the cushion member  632  that provides cushioning to the side surface  613  of the HDD main body  61 . 
         [0146]    Thus, this mounting metal fitting  62  is supported by the cushion members  631 ,  632  on the rear end surface side of the HDD main body  61  and is screwed in two places in total, one each on the right and left sides, only on the front end surface side. In conventional techniques, for example, screwing is performed on both of the rear end surface side and the front end surface side of the side surface  613  of the HDD main body  61  and both on the right and left sides, i.e., in four places in total. In this embodiment, however, screwing is performed only in the two places of the front end surface side and the mounting metal fitting  62  is supported by the cushion members  631 ,  632  on the rear end surface side and, therefore, the transmission of the vibration between the HDD main body  61  and the outside is effectively suppressed. Furthermore, in this embodiment, screwing is performed in the arm portion  623 _ 2   a  of the front end side surface supporting portion  623   a  and vibrations are absorbed also by this arm portion  623 _ 2   a.    
         [0147]    Incidentally, this mounting metal fitting  62  is formed so as to be shearable among HDD main bodies having different thicknesses. The above-described cushion member  631  is configured to be caused to adhere to the mounting metal fitting  62  with an adhesive sheet, and the cushion member  631  is selected according to the thickness of an HDD main body to be mounted, whereby the HDD main body is attached to the mounting metal fitting  62 . Therefore, no matter what HDD main body is selected, it is possible to mount the HDD main body so as to be kept horizontal. 
         [0148]    A large number of holes  622   b  are provided in the base portion  622  of this mounting metal fitting  62 . These holes  622   b  are intended for achieving weight savings at such a level that does not impair the magnetic shielding, which is one of the roles of this base portion  622 . 
         [0149]    Furthermore, this mounting metal fitting  62  has a flanged portion  624  that is connected to the base portion  622 , is bent from the base portion  622  so as to extend along the rear end surface  612  of the HDD main body  61 , and further bent in the reverse direction to extend parallel to the base portion  622 . This flanged portion  624  is intended for fixing the HDD unit  60 , in which this mounting metal fitting  62  is attached to the HDD main body  61 , to the HDD loading section  150  (see  FIG. 22 ) provided in the cabinet of the main unit  10 , and is provided with the above-described screw insertion holes  621   a.    
         [0150]    As shown in  FIG. 22 , a connector  151  is provided at a front end of the HDD loading section  150 . In loading the HDD unit  60  into the HDD loading section  150 , the connector  611   a  (see  FIG. 27 ) on the front end surface  611  of the HDD main body  61  is fitted into the connector  151  at the front end of the HDD loading section  150  in such a manner that the undersurface  615  of the HDD main body  61  faces the bottom surface side of the HDD loading section  150 , and the HDD unit  60  is fixed to the cabinet of the main unit  10  by use of a screw member with the aid of a screw insertion hole  621   a  provided in the flanged portion  624  of the mounting metal fitting  62 . 
         [0151]      FIG. 28  is a view showing the HDD loading section from which the HDD unit was removed and  FIG. 29  is a partially enlarged view of part of the HDD loading section. 
         [0152]    This HDD loading section  150  has an opening on the bottom surface of the main unit and has a shape of a scraped-out interior. The front end of this HDD loading section  150  is provided with a connector  151  that mates with the connector  611   a  (see  FIG. 27 ) of the HDD unit  60 . 
         [0153]    Upon the bottom surface of this HDD loading section  150 , there are formed pairs of positioning ribs  152  in four places. When the HDD unit  60  is loaded into the HDD loading section  150 , the sides of the mounting metal fitting  62  are position-controlled by the positioning ribs  152 . A total of four cushion members  634  are disposed in positions sandwiched between the pairs of positioning ribs  152 . As shown in  FIG. 29 , the cushion member  634  has a volume higher than the part of the positioning rib  152  that faces the undersurface  615  of the HDD main body  61 . Therefore, the HDD main body  61  is loaded into the HDD loading section  150 , with the undersurface  615  of the HDD main body  61  present on the four cushion members  634 . Between the HDD unit  60  and the side surfaces of the HDD loading section  150 , the cushion members  633  fixed to the outer walls of the rear end surface side side-supporting portion  623  of the mounting metal fitting  62  are placed. 
         [0154]    In the rear end edge of the HDD loading section  150 , when the HDD unit  60  is loaded into the HDD loading section  150 , there are formed two screw holes  153  in positions through which the screw insertion holes  621   a  of the flanged portion  624  of the mounting metal fitting  62  of the HDD unit  60  are connected. The HDD unit  60  is fixed to the cabinet of the HDD unit  60  by use of screw members through these screw insertion holes  621   a  and screw holes  153 . 
         [0155]    As described above, on the right and left side surfaces of the HDD main body  61 , the mounting metal fitting  62  is fixed by use of screws only in two places in total, one each on the right and left sides near the front end surface, and the rear end surface side of the HDD main body  61  is supported by the mounting metal fitting  62  via the cushion members  631 ,  632 . For this reason, the HDD main body  61  has high allowable levels of vibration for the mounting metal fitting  62 . This HDD main body  61  has a mechanically vibrating part inside of which a head moves above a rotating a hard disk (HD), which is a storage medium, to make access. Therefore, the HDD main body  61  itself generates vibration and is apt to malfunction when it receives vibration from the outside. In this embodiment, the HDD main body  61  has high allowable levels of vibration for the mounting metal fitting  62  owing to the above-described structure and, therefore, the transmission of vibration is substantially suppressed. Furthermore, also between the HDD unit  60  and the HDD loading section  150 , there are provided the four cushion members  634  on the bottom surface of the HDD loading section  150  and the two cushion members  633  on the rear end side of the right and left side surfaces of the HDD unit  60 , whereby allowable levels of vibration are raised. 
         [0156]    Therefore, with this structure, mechanical vibration is less apt to be transmitted between the cabinet of the main unit  10  and the HDD main body  61 , malfunctions of the HDD main body  61  due to the impact and vibration from the outside are suppressed, and the adverse effect of the vibration of the HDD main body  61  on other parts is also suppressed. 
       (Electronic Part Mounting Structure) 
       [0157]      FIG. 30  is a diagram showing a shield plate that extends under the keyboard  11  (see  FIG. 1 ) and the like constituting the top surface of the main unit  10 , with the keyboard and the like being removed. This shield plate  160  is formed by sheet metal working. 
         [0158]    A description will be given here of a mounting structure of a plate-like electronic part  70  using this shield plate  160 . 
         [0159]      FIG. 31  is an enlarged diagram showing the area of the electronic part in  FIG. 30 , and  FIGS. 32(A) to 32(C)  are diagrams of the same area of  FIG. 31 , showing an electronic part arrangement region where the electronic part is to be arranged, with the electronic part being removed.  FIG. 32(A)  is a plan view of the electronic part arrangement region,  FIG. 32(B)  is a plan view of the electronic part, and  FIG. 32(C)  is a front view of the electronic part. 
         [0160]    This electronic part  70  is an electronic part in which a communication circuit is built and has a rectangular shape as shown in  FIG. 32(B) . However, in the thickness direction, as shown in  FIG. 32(C) , the electronic part  70  is composed of a communication module  73  and a supporting plate  74  that is fixed to the communication module  73  and that has an area wider than that of the communication module  73 . Screwing through holes  71  are formed in the four corners of the supporting plate  70 , and a cable  72  that assumes the role of signal transmission to and from the outside of this electronic part  70  extends from the communication module  73 . 
         [0161]    On the other hand, in the electronic part arrangement region  170  in which this electronic part  70  is to be arranged, an opening  161  is provided in the shield plate  160  and an overhanging piece  162  that hangs over into this opening  161  is provided in a front end edge  161   a  of this opening  161  (the end edge on the right side of  FIGS. 31 and 32 ). The rear end of the opening  161  is divided by a strip-shaped portion  163 , which is formed by part of the shield plate  160  that extends like a strip, and a rear end edge  161   b  of the opening  161  is formed by the strip-shaped portion  163 . The strip-shaped portion  163  of this shield plate  160  is supported from below by three bosses  171 , which are provided in a standing manner in the inner wall of the bottom surface of the cabinet of the main unit  10  (see  FIG. 1 ). A screw hole (not shown) is formed in each of the bosses on both sides among these three bosses  171 , in the middle portion of the boss. A screw insertion hole  163   a  is formed in each part of the strip-shaped portion  163  of the shield plate  160  such that the screw insertion hole  163   a  overlaps with the above screw hole. 
         [0162]    These screw holes and screw insertion holes  163   a  are formed in positions such that they overlap with the two through holes provided on the rear end side, of the four through holes  71  formed in the electronic part  70 , when the electronic part  70  is placed in this electronic part arrangement region  170 . The two through holes  71  on the front end side of this electronic part  70  are not used here. 
         [0163]    As described above, the overhanging piece  162  that hangs over into this opening  161  is provided in the shield plate  160 . This hanging-over piece  162  assumes the role of supporting the top surface of the electronic part  70 . However, because this hanging-over piece  162  hangs over into the opening  161 , this hanging-over piece  162  becomes an obstacle when the electronic part  70  is placed from above. Furthermore, even if this electronic part  70  is to be placed by being caused to slide laterally in such a manner that the front end of the electronic part  70  comes under the overhanging piece  162 , this communication module  73  may strike the strip-shaped portion  163  of the shield plate  160 , because this electronic part  70  has such a shape that, as shown in  FIG. 32(C) , only the front end portion and the rear end portion are thin and the middle portion is thick by having the communication module  73  fixed thereto. Therefore, it is considerably difficult to dispose this electronic part  70  by causing the electronic part  70  to slide laterally. Accordingly, in this embodiment, the following configuration is contrived. 
         [0164]      FIG. 33  is a perspective view of the electronic part arrangement region as obliquely viewed from above and  FIG. 34  is an enlarged view of a front end portion of the electronic part arrangement region. 
         [0165]    In the front end portion of this electronic part arrangement region  170 , undersurface guiding ribs  172  provided in a standing manner from the inner wall of the bottom surface of the cabinet are disposed on both sides of the overhanging piece  162  and side surface guiding ribs  173  provided in a standing manner from the inner wall of the bottom surface of the cabinet are further disposed in positions where these two undersurface guiding ribs  172  are interposed. 
         [0166]    The top surface of the undersurface guiding rib  172  is composed of a support surface  172   a  and an inclined surface  172   b , and an abutment wall  172   c  is formed in a position at the base of this inclined surface  172   b.    
         [0167]    This inclined surface  172   b  is an inclined surface that inclined downward to the front end edge  161   a  of the opening  161 , and guides the front end undersurface of the electronic part  70  when the electronic part  70  is inserted obliquely downward to the front end edge  171   a.    
         [0168]    The support surface  172   a  is formed adjacent to the inclined surface  172   b  at a position more spaced from the front end edge  161   a  than the inclined surface  172   b , and supports the front end undersurface of the electronic part  70  when the electronic part  70  is made horizontal by lowering the rear end side of the electronic part  70  that is guided to the inclined surface  172   b  and inserted obliquely downward. When the undersurface of the electronic part  70  is supported by this support surface  172   a  and the electronic part  70  is placed horizontally, the top surface of this electronic part  70  on the front end side is supported by the overhanging piece  162 . 
         [0169]    Furthermore, the abutment wall  172   c  is intended for receiving abutment by the front end of the electronic part  70  that is guided to the inclined surface  172   b  and inserted obliquely downward and performing positioning of this electronic part  70  in the fore-and-aft direction. 
         [0170]    The hanging-over piece  162  has such a shape that the front end thereof is bent obliquely upward, and thus aids to insert the electronic part  70  obliquely downward. 
         [0171]    The side surface guiding ribs  173  are intended for guiding the two right and left side surfaces on the front end side of the electronic part  70  inserted obliquely downward to the front end edge  161   a  of the opening  161 , and have guide walls  173   a , which extend parallel to each other due to the pair of side surface guiding ribs  173 , and introduction walls  173   b , which are formed at a position more spaced than the guide walls  173   a  from the front end edges  161   a  of the opening  161  and open mutually toward a direction spaced from the front end edges  161   a.    
         [0172]    The guide walls  173   a  are intended for controlling the lateral direction of the electronic part  70  by guiding the sides of the electronic part  70  to correct positions, and the introduction walls  173   b  are intended for delivering the electronic part  70  to the guide walls  173   a  while correcting the lateral positions of the side surfaces of the electronic part  70 , which has been inserted into a position somewhat laterally shifted, by guiding the side surfaces of the electronic part  70 . 
         [0173]      FIG. 35  is a view showing the electronic part inserted obliquely into the electronic part arrangement region and  FIG. 36  is a view showing the inserted electronic part that is horizontally placed. 
         [0174]    In this embodiment, for the lateral direction of the electronic part  70 , the electronic part  70  inserted obliquely downward is guided with the aid of the inclined surfaces  172   b  of the undersurface guiding ribs  172  while performing position control with the aid of the side surface guiding ribs  173  and the front end of the electronic part  70  is caused to abut against the abutment wall  172   c , whereby the fore-and-aft positions are determined. Thereafter, the electronic part  70  is horizontally placed, whereby for the front end side of the electronic part  70 , the undersurface is caused to be supported by the support surfaces  172   a  of the undersurface guiding ribs  172  and the top surface is caused to be supported by the overhanging piece  162 . In this condition, screwing to the bosses that stand on the bottom surface of the cabinet is performed with the aid of the through holes  71  on the rear end side of the electronic part  70 . 
         [0175]    As described above, in this embodiment, the electronic part  70  inserted obliquely downward is guided by providing the undersurface guiding ribs  172  and, therefore, it is possible to easily dispose the electronic part  70  in a correct place in the electronic part arrangement region  170  which improves assembling efficiency.