Abstract:
An electronic apparatus includes: a case having a first cover and a second cover, which form an internal space of the case in combination; a circuit substrate loaded with an electronic circuit and disposed in the internal space of the case; and a board member extending between the circuit substrate and the second cover, of the internal space of the case. The board member has: a first fixing section that fixes the circuit substrate between the first cover and the board member; and a second fixing section that is formed at a position different from the first fixing section and fixes the board member on the second cover.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to an electronic apparatus wherein a circuit substrate, which is equipped with an electric circuit, is disposed inside a case. 
         [0003]    2. Description of the Related Art 
         [0004]    Hitherto, various types of electronic apparatus have been developed. Particularly, as to a portable type of one in which a circuit substrate for the operation is accommodated and fixed inside the case formed with putting two cover materials together, the impact by the fall and the collision, etc. is received easily because it is portable, and the damage of the circuit substrate accommodated inside the case by the impact is feared. 
         [0005]    Generally, as mentioned above, inside the case of the electronic apparatus, there is disposed, in the vicinity of the circuit substrate, a shield plate for protecting the circuit substrate from an external electromagnetic noise. 
         [0006]    In view of the foregoing, in order to protect the electrical components from the impact when the impact is applied to a chassis on which electrical components are mounted, it is considered that the shield plate is fixed on one of the cover materials, and the circuit substrate is mounted via a plate spring on the shield plate, referring to proposals (Japanese Utility Model Application Publication No. 5-13090) in which the electrical components are mounted via the plate spring on the shield plate. 
         [0007]    However, there is no room that secures the space for the stroke of the blade spring from the demand of reducing the thickness in the case about an electronic apparatus of a portable type since the past. 
         [0008]    In view of the foregoing, it is considered to screw together another cover material of two cover materials that compose the case, the shield plate, and the circuit substrate, in the order. 
         [0009]    However, in the event that those elements are screwed together, when the main unit receives the impact by the fall and the like, this impact is transmitted directly to circuit substrate and the circuit substrate might receive damage. 
       SUMMARY OF THE INVENTION 
       [0010]    The present invention has been made in view of the above circumstances and provides an electronic apparatus contributing to protecting the internal circuit substrate from the impact that the case received. 
         [0011]    An electronic apparatus according to the present invention includes: 
         [0012]    a case having a first cover and a second cover, which form an internal space of the case in combination; 
         [0013]    a circuit substrate loaded with an electronic circuit and disposed in the internal space of the case; and 
         [0014]    a board member extending between the circuit substrate and the second cover, of the internal space of the case, 
         [0015]    wherein the board member has: 
         [0016]    a first fixing section that fixes the circuit substrate between the first cover and the board member; and 
         [0017]    a second fixing section that is formed at a position different from the first fixing section and fixes the board member on the second cover. 
         [0018]    In the electronic apparatus according to the present invention, the circuit substrate and the second cover are fixed in different positions with respect to the board member. Therefore, an impact applied to the second cover is indirectly transmitted to the circuit substrate via the board member. This makes it possible to further reliably protect the circuit substrate disposed inside from an impact received by the second cover, as compared to a case where the circuit substrate and the second cover are fixed together by means of screw in the same position with respect to the board member. 
         [0019]    In the electronic apparatus according to the present invention, the first fixing section may fix the circuit substrate in such a way that the circuit substrate is bonded between the first cover and the board member, and 
         [0020]    the second fixing section may fix the board member on the second cover in such a way that the board member is bonded on the second cover. 
         [0021]    Further, in the electronic apparatus according to the present invention, it is preferable that a fixing area surrounding the first fixing section and the second fixing section is formed in thickness to be thinner than a surrounding area adjacent to the fixing area. 
         [0022]    When the fixing area of the board member is made thicker than the adjacent surrounding area in this manner, these fixing area and surrounding area serve as a so-called damper, which can absorb an impact received by the second cover. This makes it possible to more reliably lessen an impact transmitted to the circuit substrate. 
         [0023]    Furthermore, in the electronic apparatus according to the present invention, the fixing area may be formed in a groove having a difference of the groove at a boundary between the fixing area and the surrounding area adjacent to the fixing area, so that the fixing area is formed in thickness to be thinner than the surrounding area. 
         [0024]    Still furthermore, in the electronic apparatus according to the present invention, the circuit substrate may be loaded with a processing circuit for executing a program, the first cover may have a keyboard on a top of the first cover, and the electronic apparatus may further include a second case that is connected to the case on a hinge basis, the second case being openable and closable with respect to the case. In addition, the second case may be a display device that displays a processed result by the processing circuit. 
         [0025]    According to the electronic apparatus of the present invention described above, it is possible to protect a circuit substrate inside of a case from the impact that the case received. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0026]      FIG. 1  is a perspective view of an electronic apparatus according to one embodiment of the present invention. 
           [0027]      FIG. 2  is a perspective view of an electronic apparatus according to one embodiment of the present invention. 
           [0028]      FIG. 3  is a right side view of the computer shown in  FIG. 1  which is in the closed state. 
           [0029]      FIG. 4  is a bottom view of the computer according to the present embodiment. 
           [0030]      FIG. 5  is a view showing a first panel. 
           [0031]      FIG. 6  is a view showing a first panel. 
           [0032]      FIG. 7  is a view showing a state wherein a first panel is removed from a main unit. 
           [0033]      FIG. 8  is a perspective view of a fin section. 
           [0034]      FIG. 9  is a perspective view of a fin section. 
           [0035]      FIG. 10  is a perspective view of a fin section. 
           [0036]      FIG. 11  is a partially enlarged view of the frame shown in  FIG. 7 . 
           [0037]      FIG. 12  is a partially enlarged view of the frame shown in  FIG. 7 . 
           [0038]      FIG. 13  is a view showing a computer wherein a frame cover of an image display unit is removed. 
           [0039]      FIG. 14  is a view showing the inside of a back cover.  FIG. 15  is an enlarged view of a guide frame. 
           [0040]      FIG. 16  is an enlarged view of a guide frame. 
           [0041]      FIG. 17  is a perspective view of the backside of a frame cover. 
           [0042]      FIG. 18  is a partially enlarged view of the backside of a frame cover. 
           [0043]      FIG. 19  is a partially enlarged view of the backside of a frame cover. 
           [0044]      FIG. 20  is a sectional view taken along the line X-X′ of  FIG. 2 . 
           [0045]      FIG. 21  is a view of a camera unit which is incorporated in an image display unit. 
           [0046]      FIG. 22  is a partially enlarged view of the frame cover shown in  FIG. 13 . 
           [0047]      FIG. 23  is a sectional view of the image display unit including a camera unit. 
           [0048]      FIG. 24  is a perspective view of a seal member. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0049]    Embodiments of the present invention will be described with reference to the accompanying drawings. 
         [0050]      FIG. 1  and  FIG. 2  are each a perspective view of an electronic apparatus according to one embodiment of the present invention. 
         [0051]    A computer  1 , which is the present embodiment, is a so-called note type of personal computer, in which an image display unit  2  that accommodates an image display device  23  for displaying an image is connected on a free basis in opening and shutting through hinge members  10  with a main unit  3  that incorporates a circuit substrate and disposes a keyboard on the upper surface. 
         [0052]      FIG. 1  shows a state in which the image display unit  2  shuts to the main unit  3  and is piled up.  FIG. 2  shows a state in which the image display unit  2  is opened for the main unit  3 . 
         [0053]    The main unit  3  shown in  FIG. 1  and  FIG. 2  is composed of a keyboard  36  in which two or more keys are arranged, an operation section  37  that consists of a track pad and a click button, an upper cover  31  that is built avoiding part where the keyboard  36  and the operation part  37  are set, a lower cover  32  that forms a case of the main unit  3  together with the upper cover  31 , a circuit substrate equipped with CPU that executes a program, the circuit substrate being accommodated in the case, and a shield in which the circuit substrate is installed. 
         [0054]    The image display unit  2  shown in  FIG. 1  and  FIG. 2  is composed of the image display device  23  for displaying an image, a frame cover  21  for covering the periphery of the image display device  23 , a back cover  22  (refer to  FIG. 1 ) for forming a case of the image display unit  2  together with the frame cover  21 , and a guide frame for guiding wiring of the image display unit  2 , the guide frame being accommodated in the back cover  22  and being in contact with the image display device  23 . Incidentally,  FIG. 1  shows the hinge members  10  through which the image display unit  2  is connected with the main unit  3  on a free basis in opening and shutting. The section X-X′ shown in  FIG. 2  will be described later. 
         [0055]      FIG. 3  is a right side view of the computer shown in  FIG. 1  which is in the closed state. 
         [0056]      FIG. 3  shows a state that on a right side of the main unit  3  there are provided slits  32   a  for radiating heat generated from CPU loaded in the circuit substrate built into the main unit  3 . Fin sections  351 , which are the component of a heat radiation unit  35  that will be described later, appear from the slits  32   a.    
         [0057]      FIG. 4  is a bottom view of the computer according to the present embodiment. 
         [0058]      FIG. 4  shows the lower cover  32  that forms a case of the main unit  3  together with the upper cover  31  (refer to  FIG. 2 ). The lower cover  32  is composed of a first panel  321 , a second panel  322 , a third panel  323 , a fourth panel  324 , and a peripheral panel  325 . In the following, the first panel is typically taken up among these two or more panels and it explains. 
         [0059]      FIG. 5  and  FIG. 6  are each a view showing the first panel.  FIG. 5  shows the appearance in which the first panel  321  shown in  FIG. 4  is seen from the front side. The first panel  321  is provided with slits  321   e  for ventilation, and screw holes  321   a,    321   b,    321   c,  and  321   d  to install the first panel  321  in a frame that will be described later. In the following, for the sake of convenience of the explanation, among the screw holes  321   a,    321   b,    321   c,  and  321   d  shown in  FIG. 5 , the screw hole in the vicinity of the center, the screw hole shown in the upper part in  FIG. 5  of the screw hole in the vicinity of the center, and the screw hole in the right part in  FIG. 5  of the screw hole in the vicinity of the center are referred to as a first screw hole  321   b,  a second screw hole  321   c,  and a third screw hole  321   d,  respectively. 
         [0060]      FIG. 6  shows a part of the first panel  321  in the state that the left side of the first panel  321  shown in  FIG. 5  is set up, and pushed down right, so that the first panel  321  is turned inside out. The third screw hole  321   d  is shown left in  FIG. 6 , and the first screw hole  321   b  is shown in right in  FIG. 6 . 
         [0061]    In  FIG. 6 , bosses  320  are prepared for in surroundings of these the first screw hole  321   b  and the third screw hole  321   d,  respectively. Incidentally, the reason why the boss  320  is prepared for in surroundings of the screw hole is described later. 
         [0062]      FIG. 7  is a view showing a state wherein the first panel is removed from the main unit. 
         [0063]      FIG. 7  shows a shield  33  on which a circuit substrate equipped with CPU is mounted. The shield  33  is provided with a first locking hole  33   b  into which a nut which is engaged with a screw on a spiral basis, the screw being inserted through the first screw hole  321   b  of the first panel  321  (refer to  FIG. 5 ), is dropped, a second locking hole  33   c  into which a nut which is engaged with a screw on a spiral basis, the screw being inserted through the second screw hole  321   c,  is dropped, a third locking hole  33   d  into which a nut which is engaged with a screw on a spiral basis, the screw being inserted through the third screw hole  321   d,  is dropped, and a screw hole  33   e  for substrate to install a circuit substrate equipped with an electric circuit in the shield  33 . The screw hole  33   e  for substrate to install a circuit substrate in the shield  33  is installed at the position that shifts from the first locking hole  33   b.    
         [0064]      FIG. 7  further shows a heat radiation unit  35  which is composed of an endothermic board  353 , a fin section  351  consisting of two or more radiation fins, a heat transfer member  352  for transferring the heat of the endothermic board  353  through two or more radiation fins to the fin section  351 , the heat transfer member  352  being installed in the endothermic board  353 , and a fixing arm  354  for fixing the endothermic board  353  on the circuit substrate equipped with CPU so that the endothermic board  353  is touched to the CPU. 
         [0065]      FIG. 7  still further shows a fan  34  that sends air to a space formed with the heat radiation fin of the heat radiation unit  35 . The air sent from the fan  34  goes out of the slits  32   a  shown in  FIG. 3  too outside the case depriving of the heat that had conducted to the fin section  351  when passing through the space formed with the heat radiation fin. 
         [0066]    Here, there will be explained in detail the fin section  351  of the heat radiation unit  35  prepared for in the computer  1  according to the present embodiment. 
         [0067]      FIG. 8  is a perspective view of a fin section. 
         [0068]      FIG. 8  shows the fin section  351  penetrated with the heat transfer member  352 , which is turned the side where air from the fan  34  flows out to the right of  FIG. 8 . 
         [0069]    The fin section  351  shown in  FIG. 8  is one in which first fins  3511  each having a notch  351   a  on the center portion of the air outflow side edge, and second fins  3512  each free from notch  351   a,  are alternately arranged. 
         [0070]    According to the present embodiment, the first fins  3511  and the second fins  3512  are alternately arranged with spaces so as to spread width on the air outflow side. As a result, it is possible to reduce the collision of the edge of the first fins  3511  with air as compared with a case where only the second fins  3512  having no notch  351   a  are arranged similarly. Therefore, according to the present embodiment, the preparation of the notches  351   a  of the first fins  3511  on the edge portion makes it possible to suppress the noise without so much decreasing the heat radiation function. 
         [0071]    Incidentally, according to the present embodiment, the conduction of heat to the fin section  351  is performed through the endothermic board  353  and the heat transfer member  352 . However, it is acceptable that the fin section  351  is disposed on CPU as not shown in the figure without the endothermic board  353  and the heat transfer member  352 . Alternatively, it is acceptable that neither the first fin  3511  nor the second fin  3512  are alternately arranged, but they are arranged calculatedly in such a way that the first one fin  3511  enters when the second two fins  3512  are consecutive. 
         [0072]      FIG. 9  and  FIG. 10  are each a perspective view of a fin section. 
         [0073]      FIG. 9  shows a heat radiation unit  45  having a fin section  451  wherein same notches  451   a  as the notches  351   a  explained in  FIG. 8 , are prepared only at the side where air of the first fin  4511  flows in, which is different from the fin section  351  shown in  FIG. 8 . In this way, preparation of the notches  451   a  only at the side where air flows in also makes it possible to suppress the noise without so much decreasing the heat radiation function. 
         [0074]      FIG. 10  shows a heat radiation unit  55  having a fin section  551  wherein same notches  551   a  as the notches  351   a  explained in  FIG. 8 , are prepared at both the side where air of the first fin  5511  flows in and the side where the air flows out. In this way, preparation of the notches  551   a  at both the side where air flows in and the side where air flows out makes it possible to further suppress the noise without so much decreasing the heat radiation function. 
         [0075]    Next, there will be explained the first locking hole  33   b,  the second locking hole  33   c,  the third locking hole  33   d,  and the screw hole  33   e  for substrate. 
         [0076]      FIG. 11  and  FIG. 12  are each a partially enlarged view of the frame shown in  FIG. 7 . 
         [0077]      FIG. 11  shows the appearance in which the first locking hole  33   b,  the third locking hole  33   d,  and the screw hole  33   e  for substrate are prepared for in a thin thickness area  331  where it is dropped in by one step so that the thickness is thinned more than other areas, of the shield  33 . 
         [0078]      FIG. 12  shows the appearance in which a circuit substrate  36  equipped with CPU (not illustrated) that comes in contact with the endothermic board  353  is screwed to the thin thickness area  331  of the shield  33  through spacers  360 . Also here, a position where the circuit substrate  36  is screwed to the shield  33  shifts from a position of the second locking hole  33   c  where the first panel  321  is screwed to the shield  33 . 
         [0079]      FIG. 12  further shows the appearance in which the fixing arm  354  is screwed to the circuit substrate  36  through the spacers  360 . Incidentally, the first screw hole  321   b  on the back of the first panel  321 , and the boss  320  provided on the periphery of the third screw hole  321   d,  which are shown in  FIG. 6 , are for providing an offset for a difference of the groove formed with the thin thickness area  331  of the shield  33  and other areas so that the first panel  321  should not crack when tightening up a screw. 
         [0080]    According to the present embodiment, the circuit substrate  36  and the first panel  321  are coupled with one another at positions which are different with respect to the shield  33 . Therefore, the impact to the first panel  321  is simply transmitted to the circuit substrate  36  only indirectly through the shield  33 . Thus, according to the present embodiment, it is possible to suppress the impact that the circuit substrate  36  receives as compared with the case where the circuit substrate  36  and the first panel  321  are screwed together in the same part with respect to the shield  33 . 
         [0081]    Further, according to the present embodiment, the thin thickness area  331  thins in its thickness through drop-in by one step from a surrounding area that is adjacent to the thin thickness area  331 . Therefore, the thin thickness area  331  of the shield  33  and the surrounding area serve as a damper, and thus it is possible to attenuate with the shield  33  the impact that the first panel  321  receives. As a result, the impact transmitted to the circuit substrate  36  through the shield  33  can be softened further more. 
         [0082]    Next, there will be explained the structure of the image display unit  2  in detail. 
         [0083]      FIG. 13  is a view showing a computer wherein a frame cover of the image display unit is removed. 
         [0084]      FIG. 13  shows the computer  1  wherein the frame cover  21 , which covers the front surroundings edge of the image display device  23 , is removed, and the frame cover  21 . Here, there is shown the appearance in which the whole image display device  23  accommodated by the back cover  22  that forms the case of the image display unit  2  with the frame cover  21  is exposed by detaching the frame cover  21 . While the illustration is omitted in  FIG. 13 , actually, the camera unit, the mike unit, and the wiring etc. attached to these are furthermore disposed to surroundings of the image display device  23 . Moreover, though in the frame cover  21  shown in  FIG. 13 , there is a part where acrylic board  26  is set in part, this is described later. 
         [0085]      FIG. 14  is a view showing the inside of the back cover. 
         [0086]      FIG. 14  shows the appearance in which the image display device  23  is detached from the image display unit  2  in the state shown in  FIG. 13 , and the inside of the back cover  22  is exposed. Here, there is shown the appearance in which guide frames  24  that are vertically extended are installed at right and left both ends in the back cover  22 , respectively. 
         [0087]    The guide frames  24  are installed in the inside of the back cover  22  at intervals from standing walls  221  prepared for in surroundings of the back cover  22 . The image display device  23  is set between these two guide frames  24 . 
         [0088]      FIG. 14  further shows the appearance in which a wiring  100  passes through between the guide frame  24  shown at the right side in  FIG. 14  and the standing wall  221  of the back cover  22 . Incidentally, actually, the wiring  100  passes through between the guide frame  24  shown at the left side in  FIG. 14  and the standing wall  221  of the back cover  22 . This is omitted in illustration. 
         [0089]      FIG. 15  and  FIG. 16  are each an enlarged view of a guide frame. 
         [0090]      FIG. 15  shows an enlarged view of the edge shown under  FIG. 14 , of the guide frame  24  shown left in  FIG. 14 , and also shows a hinge member  10 . 
         [0091]    The guide frames  24  is composed of a base section  241  as a base, a convexo-concave touching section  242  which touches the back surroundings edge (back edge part) of the image display device  23  prepared for on the base section  241 , and an isolation section  243  for separating the image display device  23  which the touching part  242  touches and the wiring  100 , the isolation section  243  being established on the base section  241 . The guide frame  24  is formed with an elastomer and fixed to the back cover  22  by a prescribed bonding means. The double-faced tape and the adhesive can be adopted as the bonding means. Incidentally, it is acceptable that the guide frame  24  is composed of another part which is different from the back cover  22  as in the present embodiment; alternatively, it is acceptable that the guide frame  24  is formed in a united body with the back cover  22 . 
         [0092]    In the image display unit  2 , the isolation section  243  of the guide frame  24  separates the image display device  23  and the wiring  100 . Thus, according to the image display unit  2 , the wiring  100  is prevented from going into the space between the back of the image display device  23  accommodated by the back cover  22  and the back cover  22 . Therefore, according to the present embodiment, it is possible to prevent damage of the image display device  23  caused by the effect that the impact onto the back cover  22  is transferred to the image display device  23  through the wiring  100  which goes into the space between the back of the image display device  23  and the back cover  22 . 
         [0093]    According to the present embodiment, it is possible to absorb the pressure that applies to the image display device  23  when the touching section  242  of the guide frame  24  is shaped as a convexo-concave. 
         [0094]      FIG. 15  further shows a wiring restriction section  244  that is one of components of the guide frame  24 . The wiring restriction section  244  provides such a restriction that the wiring, which is taken to pass between the isolation section  243  and the standing wall  221  of the back cover  22 , should not float. This feature makes it possible to prevent the wiring  100  pushed between the isolation section  243  and the standing wall  221  once from returning to this side, and thus it is possible to contribute to the improvement of the assembly efficiency in the assembly process. 
         [0095]    Moreover,  FIG. 15  shows the appearance in which a slope  243   a  is formed on the point of the part that is adjacent to the touching section  242 , of the isolation section  243 , and in addition a slope  245   a  is formed on the tip of a raising section  245  established at the bottom of the base  241 . Incidentally, the slopes  243   a  and  245   a  are shown in the slash in  FIG. 15 . While details are described later, slopes which touch the slopes  243   a  and  245   a,  respectively, are prepared for at the position corresponding to the slope  243   a  and  245   a  on the other side of the frame cover  21 . 
         [0096]      FIG. 16  shows the enlarged view of the edge on the other side which is opposite to the edge shown in  FIG. 15 , of the guide frame  24  shown at the left of  FIG. 14 . 
         [0097]      FIG. 16  also shows the appearance in which the slope  243   a  is formed on the point of the isolation section  243  that is adjacent to the touching section  242 . In  FIG. 16 , the slope  243   a  is shown in the slash. Incidentally, a slope which touches the slope  243   a  is prepared for on the other side of the frame cover  21 . 
         [0098]      FIG. 17  is a perspective view of the backside of a frame cover. 
         [0099]      FIG. 17  shows a part of the frame cover  21  of  FIG. 13  in the state that the upper part in  FIG. 13  is set up forward and turned over. In the upper part in  FIG. 17  there is shown notches  21   b  installed to evade the hinge members  10 . 
         [0100]    Further,  FIG. 17  shows first convex sections  212  prepared for on the parts corresponding to the touching sections  242  shown in  FIG. 15  and  FIG. 16 , respectively, on the other side of the frame cover  21 , and second convex sections  213  prepared for on the part corresponding to the raising section  245  shown in  FIG. 15 , respectively, on the other side of the frame cover  21 . 
         [0101]    In addition,  FIG. 17  shows a concave section  211  which is depressed by one step when seeing from the surface of the frame cover  21 , that is, which offers upheaval to this side in  FIG. 17  at the center of the other side opposite to the side where the notches  21   b  are installed, on the other side of the frame cover  21 . The concave section  211  is provided with a hole  211   a  into which the tip of the miniature camera described later is inserted. Incidentally, the part of the guide frame  24  shown in  FIG. 15  and  FIG. 16  is covered with the left side of the frame cover  21  shown in  FIG. 17 .  FIG. 17  further shows screw holes  210   a  for installing the frame cover  21  in the back cover  22 . 
         [0102]      FIG. 18  is a partially enlarged view of the backside of a frame cover.  FIG. 19  is a partially enlarged view of the backside of a frame cover. 
         [0103]      FIG. 18  shows the appearance in which the frame cover  21  shown in  FIG. 17  is seen in the direction of the arrow Y that is shown in  FIG. 17 . Here, there is shown the first convex section  212  that has slopes  212   a  each touching the slope  243   a  shown in  FIG. 16 . 
         [0104]      FIG. 19  shows the appearance in which the frame cover  21  shown in  FIG. 17  is seen in the direction of the arrow Z that is shown in  FIG. 17 . Here, there is shown the second convex section  213  that has slopes  213   a  each touching the slope  245   a  shown in  FIG. 15 . 
         [0105]      FIG. 20  is a sectional view taken along the line X-X′ of  FIG. 2 . 
         [0106]      FIG. 20  shows the appearance in which the slope  212   a  of the first convex section  212  shown in  FIG. 18  comes in contact with the slope  243   a  of the isolation section  243  shown in  FIG. 16 . 
         [0107]      FIG. 20  further shows the appearance in which the touching section  242  of the guide frame  24  touches the back surroundings edge of the image display device  23 , and the isolation section  243 , which is established on the base section  241 , separates the wiring  100  and the image display device  23 . 
         [0108]      FIG. 20  furthermore shows the appearance in which the wiring restriction section  244  projects from the isolation section  243  to the standing wall  221  of the back cover  22 . 
         [0109]    According to the present embodiment, the slope  243   a  of the isolation section  243  comes in contact with the first convex section  212  of the frame cover  21 , and the slope  245   a  of the raising section  245  comes in contact with the second convex sections  213  of the frame cover  21 . This feature makes it possible to distribute the pressure that applies to the frame cover  21 , so that the pressure that reaches the image display device  23  can be weakened. 
         [0110]      FIG. 21  is a view of a camera unit which is incorporated in an image display unit. 
         [0111]      FIG. 21  shows a camera unit  25 , which is disposed to surroundings where the image display device  23  is avoided, in the back cover  22 . The camera unit  25  is composed of an image taking lens  251 , a barrel  252  of which the image taking lens  251  is set to the front, the barrel  252  incorporating therein an image sensor (not illustrated) on which the subject light passed through the image taking lens  251  is image-formed, a circuit substrate  253  that is loaded with electronic circuits for processing an image signal outputted from the image sensor, and a connector for coupling the circuit substrate  253  and the wiring  100 . Incidentally, the front  2521  of the barrel  252 , to which the image taking lens  251  is set, is smoothly formed. 
         [0112]      FIG. 22  is a partially enlarged view of the frame cover shown in  FIG. 13 . 
         [0113]      FIG. 22  shows the appearance in which the part that covers the camera unit  25  shown in  FIG. 21 , of the frame cover  21 , is seen from the front side. 
         [0114]    Moreover,  FIG. 22  shows the appearance in which acrylic board  26  is set into the concave section  211  prepared for in the part with which the camera unit  25  is covered, of the frame cover  21 , the concave section  211  being dropped-in by one step from surroundings. 
         [0115]    The concave section  211  is provided with a hole  211   a  through which the tip of barrel  252  of the camera unit  25  is inserted. Moreover, the frame cover  21  shown in  FIG. 22  is actually colored to the black. Also regarding the acrylic board  26 , only the part that meets the hole  211   a  prepared for in the concave section  211  is transparent, and another is colored to the black. 
         [0116]    Moreover,  FIG. 22  shows screw holes  21   a  for fixing the frame cover  21  to the back cover  22 , and in addition facing materials  28  to be set in here to conceal the screw holes  21   a  after the frame cover  21  is fixed to the back cover  22 . 
         [0117]      FIG. 23  is a sectional view of the image display unit including a camera unit. 
         [0118]      FIG. 23  shows the appearance in which seal material  27  is placed between the front side  2521  of the barrel  252  of the camera unit  25  and the back of the acrylic board  26 , the seal material  27  being inserted through the hole  211   a  of the concave section  211  of the frame cover  21 . 
         [0119]    The seal material  27  seals up the image taking lens  251  by a few collapsing between the acrylic board  26  and the barrel  252  when the frame cover  21  is fixed to the back cover  22 . 
         [0120]      FIG. 24  is a perspective view of the seal member. 
         [0121]    As the seal material  27 , there is adopted one made of hard rubber shaped as a ring, so as not to cover the image taking lens  251  when collapsing. The seal material  27  is the one whose outside diameter may be completely installed on hole  211   a  prepared for in the concave section  211  of the frame cover  21 , and whose thickness is thinner than the thickness of the concave section  211 . 
         [0122]    According to the present embodiment, the dustproof of the image taking lens  251  is implemented in such a way that the seal material  27  is placed between the acrylic board  26  and the barrel  252 . This feature makes it possible to contribute to a miniaturization in surroundings of the barrel  252  without decreasing dustproof as compared with a case where the cap that protrudes even to surroundings of the barrel  252  is installed. Incidentally, it is acceptable that the material of the seal material  27  is a material because it only has to be able to secure sealing up as soft as the sponge, but not the one limited to the hard rubber. 
         [0123]    Although the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by those embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and sprit of the present invention.