Patent Publication Number: US-2013235539-A1

Title: Waterproof structure

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2012-052913, filed Mar. 9, 2012, the entire contents of which are incorporated herein by reference. 
     FIELD 
     Embodiments described herein relate generally to a waterproof structure. 
     BACKGROUND 
     An electronic apparatus such as a TV, personal computer, tablet computer, personal digital assistant (PDA), and cellular phone may comprise a waterproof structure. 
     To obtain the desired waterproof characteristics, the design of such an electronic apparatus comprising a waterproof structure may be limited. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A general architecture that implements the various features of the embodiments will now be described with reference to the drawings. The drawings and the associated descriptions are provided to illustrate the embodiments and not to limit the scope of the invention. 
         FIG. 1  is an exemplary perspective view showing a TV according to a first embodiment; 
         FIG. 2  is an exemplary cross-sectional view showing the TV of the first embodiment, taken along line F 2 -F 2  of  FIG. 1 ; 
         FIG. 3  is an exemplary front view showing a part of the TV of the first embodiment; 
         FIG. 4  is an exemplary front view showing an example of transformation of the TV of the first embodiment; 
         FIG. 5  is an exemplary front view showing lens parts of the first embodiment; 
         FIG. 6  is an exemplary front view showing the lens parts of the first embodiment from an opposite side to  FIG. 5 ; 
         FIG. 7  is an exemplary front view showing a part of a mask and a transparent member of the first embodiment in a disassembled fashion; 
         FIG. 8  is an exemplary perspective view of the transparent member and a third double-sided tape of the first embodiment; 
         FIG. 9  is an exemplary cross-sectional view showing an example of a manufacturing process of the TV of the first embodiment; 
         FIG. 10  is an exemplary front view showing a base and module circuit board of the first embodiment in a disassembled fashion; 
         FIG. 11  is an exemplary perspective view showing a tablet computer according to a second embodiment; 
         FIG. 12  is an exemplary perspective view showing a part of the slate computer of the second embodiment; 
         FIG. 13  is an exemplary perspective view showing the tablet computer of the second embodiment in a disassembled fashion; 
         FIG. 14  is an exemplary perspective view showing a part of the disassembled tablet computer of the second embodiment; and 
         FIG. 15  is an exemplary cross-sectional view of a part of a tablet computer according to a third embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     Various embodiments will be described hereinafter with reference to the accompanying drawings. 
     In general, according to one embodiment, a waterproof structure includes a casing, a circuit board, a lens part and a transparent member. The casing includes a wall including a first opening. The circuit board is stored in the casing, the circuit board with an electronic component mounted thereupon, the electronic component facing the first opening. The lens part is exposed outside the casing, at least a part of the lens part being in the first opening. The transparent member is fixed to the wall from an inside of the casing, the transparent member configured to seal the first opening. 
     Hereinafter, a first embodiment is described referring to  FIGS. 1 to 10 . In the present specification, it is defined that a before side (that is, a user side) is referred to as a front direction, a far side of the user side is referred to as a rear direction, a left side of the user side is referred to as a left direction, a right side of the user side is referred to as a right direction, an upward side of the user side is referred to as an upper direction, and a lower side of the user side is referred to as a lower direction. If a single element can be referred to by a plurality of names, such names are added thereto. However, it does not mean that a single element which is referred to by a single name is limited to the single name, or the additional names are limited thereto. 
       FIG. 1  is an exemplary perspective view showing a television receiver (hereinafter referred to as TV)  10 . The TV  10  is an electronic apparatus and an example of a waterproof structure. As shown in  FIG. 1 , the TV  10  comprises a TV main body (TV, television receiver, main body, display apparatus)  12  and a stand  13 . The stand  13  is rotatably connected to the TV main body  12 . The stand  13  is placed on a ground surface (outer surface, flat surface, surface) such as a TV rack to support the TV main body  12 . 
     The TV main body  12  comprises a casing (cabinet, exterior portion, wall)  15  and a display module (a display apparatus, display part, electronic part, part)  16 . The display module  16  is, for example, a liquid crystal display. The display module is not limited to the liquid crystal display, and may be a plasma display or an organic electroluminescence display. The display module  16  is stored in the casing  15 . 
       FIG. 2  is an exemplary cross-sectional view showing a part of the TV taken along line F 2 -F 2  of  FIG. 1 . The casing  15  comprises a front surface  21  and side surface (outer surface, surface, sidewall, wall portion, wall)  22 . The side surface  22  is positioned at a right side from a user&#39;s standpoint. As shown in  FIG. 2 , the front surface  21  comprises a rectangular display opening  26 . In other words, the front surface  21  is formed in a shape of a frame surrounding the display opening  26 . The display opening  26  exposes a display surface of the display module  16  configured to display an image. 
     The side surface  22  is a surface to substantially cross the front surface  21 . A part of the side surface  22  is inclined from the front surface  21  toward a rear direction in a manner to come close to a center part of the TV main body  12 . The side surface  22  comprises an interface portion  27 . The interface portion  27  is formed to project from the side surface  22 . 
     The interface portion  27  comprises a plurality of buttons (switches, manipulated portions, parts, members, input portions) and a plurality of openings. The buttons are, for example, channel switching buttons and volume control buttons. Into the openings, for example, a card such as a B-CAS card and connectors such as a USB connector and HDMI connector are inserted. 
     The casing  15  further comprises a rear surface positioned on an opposite side to the front surface  21 , and a lower surface  29  shown in  FIG. 2 . The lower surface  29  crosses the front surface  21 . The rear surface comprises, for example, a plurality air holes and the stand  13  fixed thereto. The lower surface  29  comprises a plurality of speaker openings configured to, for example, output sound. 
     As shown in  FIG. 2 , the casing  15  comprises a mask (cover, covering portion, exterior portion, member, part)  31  and a base (cover, base portion, exterior portion, member, part)  32 . The mask  31  is an example of a first member. 
     The mask  31  and base  32  are formed of, for example, synthetic resin. The mask  31  forms at least a part of the front surface  21  of the casing  15 . The base  32  forms the side surface  22 , the lower surface  29  and the rear surface. 
     The base  32  comprises a sidewall (wall, side portion)  34  which forms the lower surface  29  of the casing  15 . The sidewall  34  comprises a button opening (hole, concave part, inserted part)  35 . A button member (manipulated portion, input portion)  36  is inserted into the button opening  35 . The button member is, for example, a power button. A first end portion of the button member  36  is exposed outside the casing  15 . A second end portion of the button member  36  engages with the sidewall  34  inside the casing  15  to prevent the button member  36  from slipping out of the casing  15  from the button opening  35 . 
     A keypad  38  covers the button opening  35  and the second end portion of the button member  36  from the inside of the casing  15 . The keypad  38  is formed of synthetic rubber such as, for example, silicon rubber. The keypad  38  contacts the sidewall  34  in a watertight fashion and seals the button opening  35 . 
     The keypad  38  comprises a projection  39  projecting toward the inside of the casing  15 . When the button member  36  is pushed by a user from the outside of the casing  15 , the keypad  38  elastically deformed. Thereby, the projection  39  is elastically displaced toward the inside of the casing  15 . 
     A fixing member  41  is attached to the inside of the casing  15 . The fixing member  41  is formed of, for example, a metal plate bent in an L-shape. The fixing member  41  comprises an attachment portion  42  and retaining portion  43 . 
     The attachment portion  42  is formed in a rectangular shape, and fixed to the casing  15  by, for example, welding. The retaining portion  43  is formed in a rectangular shape and is substantially orthogonal to the attachment portion  42 . The retaining portion  43  faces the sidewall  34  from the inside of the casing  15  and pushes a part of the keypad  38  to the sidewall  34 . Thereby, the keypad  38  is interposed between the sidewall  34  and retaining portion  43  to contact the sidewall  34  in a watertight fashion. 
     The casing stores a main circuit board (mother board, part)  47  and a module circuit board (daughter board, wire board, circuit board, part)  48 . The module circuit board  48  is an example of a circuit board. 
     The main circuit board  47  is, for example, a printed circuit board. Various electronic parts such as an LSI are mounted on the main circuit board  47 . The main circuit board  47  is attached to a display module  16  through, for example, a spacer, and connected to the module circuit board  48  by, for example, a cable. 
     At least a part of the module circuit board  48  faces the mask  31  from the inside of the casing  15 . The module circuit board  48  is placed to be substantially orthogonal to the sidewall  34 . The module circuit board  48  is closer to the sidewall  34  than the main circuit board. 
     The module circuit board  48  comprises a first surface (region, portion)  51  and a second surface (region, portion)  52 . The first surface  51  faces the mask  31 . The second surface  52  is positioned at an opposite side to the first surface  51 . Various electronic parts such as switch  54  and condenser, etc. are mounted on the second surface  52 . 
     The switch  54  comprises a manipulated portion  55  projecting toward a button opening  35 . When the manipulated portion  55  is pushed, the switch  54  is manipulated. A tip of the manipulated portion  55  contacts a tip of the projection  39  of the keypad  38 . When a user pushes the button member  36 , the elastically displaceable projection  39  of the keypad  38  pushes the manipulated portion  55 . Thereby, the switch  54  is manipulated. 
     As shown in  FIG. 2 , the mask  31  comprises a wall portion (portion, wall, region)  61  and a edge portion (outer periphery, frame portion, protrusion, projection)  62 . The wall portion  61  is formed in a frame shape to surround the display opening  26 . The edge portion  62  is formed in a frame shape to surround the wall portion  61 . 
     The wall portion  61  comprises a substantially flat outer surface (one surface, first surface, region)  65  and a substantially flat inner surface (other surface, second surface, region)  66 . The outer surface  65  faces the outside of the casing  15 . The inner surface  66  is placed at an opposite side to the outer surface  65  and faces the inside of the casing  15 . The inner surface  66  faces at least a part of the module circuit board  48 . 
     A transparent panel (board, protection portion, covering portion, transparent portion)  68  is attached to the outer surface  65  of the wall portion  61 . The panel  68  is an example of a second part, and for example, a glass panel. The panel  68  covers the display opening  26  and forms a part of the front surface  21  of the casing  15 . The display portion of the display module  16  is exposed outside the casing  15  over the panel  68 . 
     A first double-sided tape (adhering part, adhering layer, stacking portion, fixing portion, attachment portion, waterproofing portion, water-resistant portion)  71  is interposed between the outer surface  65  of the wall portion  61  and the panel  68 . The first double-sided tape  71  is an example of the first adhering part. The first double-sided tape  71  is formed in a frame shape corresponding to the shape of the outer surface  65  of the wall portion  61 . 
     The panel  68  is fixed to the outer surface  65  by the first double-sided tape  71 . Here, the fixing material is not limited to the first double-sided tape  71 , but for example, an adhesive agent or other synthetic resin may be used to fix the panel  68  to the outer surface  65 . The first double-sided tape  71  is waterproof to prevent liquid from entering the inside of the casing  15  through a gap between the outer surface  65  of the wall portion  61  and the panel  68 . 
     The wall portion  61  comprises a plurality of first openings (apertures, holes, concave portions)  73  and a plurality of grooves (recesses, concave portions)  74 . Here,  FIG. 2  shows a single first opening  73  and a single groove  74 . Hereinafter, the explanation is given referring to the single first opening  73  and the single groove  74  unless otherwise specified. 
     The first opening  73  opens over the outer surface  65  and inner surface  66 . At least a part of the first opening  73  is covered by the panel  68 . The groove  74  is provided on the outer surface  65 . The panel  68  covers at least a part of the groove  74 . 
       FIG. 3  is an exemplary front view showing a part of the TV  10 . As shown in  FIG. 3  with a broken line, a first end of the groove  74  continues to the first opening  73 . The groove  74  extends from the first opening  73  to the edge portion  62 . In other words, the groove  74  extends to be distant from the display opening  26 . As shown in  FIG. 3 , the groove  74  may comprise a plurality bent portions. 
     A second end of the groove  74  forms a notched portion (hole, groove, recess, concave portion)  76  on the edge portion  62 . The notched portion  76  is formed in substantially a U-shape. As shown in  FIG. 2 , a step portion (convex portion, projection, protrusion)  77  protruding outside the casing  15  is formed at a bottom surface  74   a  of the groove  74 . As shown in  FIG. 3 , the grooves  74  are connected to each other by connecting grooves  75 . 
     As shown in  FIG. 2 , the edge portion  62  projects from the outer surface  65  of the wall portion  61 . An inner edge (edge, inner periphery, end)  62   a  of the edge portion  62  faces an outer edge (periphery, outer periphery, end)  68   a  of the panel  68 . 
     The outer edge  68   a  of the panel  68  and the notched portion  76  formed on the edge portion  62  form a second opening  78 . In other words, the mask  31  and the panel  68  form the second opening  78 . The formation of the second opening  78  is not limited thereto and may be formed at other positions such as panel  68 . 
     The second opening  78  opens on the outside of the casing  15 . The second opening  78  has a shape different from the first opening  73 . Here, the first opening  73  and the second opening  78  may have the same shape. 
     As shown in  FIG. 3 , the second opening  78  is formed at a position shifted from the first opening  73 . In other words, when looking the front surface  21  in front, it is recognized that at least a part of the second opening  78  is out of the first opening  73 . 
       FIG. 4  is an exemplary front view showing an example of a transformation of the TV  10 . As shown in  FIG. 4 , the first opening  73  and a part of the second opening  78  may overlap with each other. As shown in  FIGS. 3 and 4 , at least a part of the second opening  78  is placed at a position shifted from the first opening  73 . 
     As shown in  FIG. 2 , an intermediate part (hole, gap, path, region)  81  is formed by the groove  74  on the outer surface  65  of the wall portion  61  and the panel  68 . In other words, the intermediate part  81  is formed by the mask  31  comprising the groove  74  and the panel  68  covering the groove  74 . The intermediate part  81  connects the first opening  73  and the second opening  78 . In other words, the second opening  78  connects with the first opening  73  through the intermediate part  81 . Or, further in other words, the intermediate part  81  is provided between the first opening  73  and the outside of the casing  15 . 
       FIG. 5  is an exemplary perspective view showing lens parts  83 .  FIG. 6  is an exemplary perspective view showing the lens parts  83  viewed from the opposite side to  FIG. 5 . As shown in  FIG. 2 , a plurality of lens parts (transparent portions, light guiding portions, reflective portions, members)  83  are attached to the mask  31 . 
     A part of the lens part  83  is stored in the intermediate part  81 . As shown in  FIGS. 5 and 6 , a part of the lens parts (connecting portions, intermediate portions, light guiding portions)  83  is formed in a plate shape to correspond to the shape of the intermediate part  81 . 
     For example, a lens part  83  at a left side in  FIG. 5  (referred to as “lens part  83 A” for the sake of clarification) comprises a rectangular first portion, a rectangular second portion, and a third portion. The first portion extends from the first end  83   a  along the edge portion  62 . The second portion crosses the first portion and extends toward the second end  83   b . The third portion projects from a portion where the first portion and the second portion cross. At the portion where the first portion and the second portion of the lens part  83 A cross, an opposite side of the third part is planed off. 
     A lens part  83  at a center in  FIG. 5  (referred to as “lens part  83 B” for the sake of clarification) comprises a rectangular first portion, a second portion, and a rectangular third portion. The first portion extends from the first end  83   a  along the edge portion  62 . The second portion extends slantwise with respect to the first portion. The third portion extends from the end of the second portion in a direction orthogonal to the first portion. The second portion is bent at about the intermediate portion. The second portion comprises a portion projecting in a direction where the second end  83   b  exists. 
     A lens part  83  at a right side in  FIG. 5  (referred to as “lens part  83 C” for the sake of clarification) comprises a rectangular first portion, a rectangular second portion, and a rectangular third portion. The first portion extends from the first end  83   a  to an outer periphery of the edge portion  62 . The second portion is connected to the first portion and larger than the first portion. The third portion extends from the second portion to a second end  83   b . A portion where the first portion and the second portion connect to each other inclines in a direction to where the first portion extends. 
     As explained above, each of lens parts  83 A,  83 B and  83 C comprises a rectangular portion, inclined an extending portion, and a projecting portion. In other words, each of lens parts  83 A,  83 B and  83 C has a winding (wavy, meandering) shape. Thereby, light from the first end  83   a  of the lens part  83  reflects at each portion and go toward the second end  83   b  of the lens part  83 . 
     The projecting portion of each of the lens parts  83 A,  83 B and  83 C engages with the intermediate part  81 . Thereby, each of lens parts  83 A,  83 B and  83 C stably fits in the intermediate part  81 , and unsteady movement of the lens parts  83  is prohibited (cf.  FIG. 14 ). 
     A first end (light inlet portion, light outlet portion)  83   a  of the lens  83  projects from a first surface of a plate-like portion of the lens part  83 . A second end (light inlet portion, light outlet portion)  83   b  of the lens  83  projects from a second surface of the plate-like portion of the lens part  83 . In other words, the first end  83   a  of the lens part  83  projects to an opposite side to the second end  83   b  of the lens part  83 . 
     Inclined portions (refraction portion, reflection portion)  83   c  are formed near the first end  83   a  and the second end  83   b  of the lens part  83 . The inclined portions  83   c  reflect light from the first end  83   a  of the lens part  83  toward the second end  83   b.    
     The lens parts  83  are connected to each other by connecting portion  84 . The connecting portion  84  is connected to part of the plate-shaped portions of the lens parts  83 . The lens parts  83  and connecting portion  84  are formed integrally. 
     The connecting portion  84  is located inside of the mask  31  deeper than the lens parts  83 . The connecting portion  84  comprises a first rectangular portion extending along the edge portion  62  and three second portions each extending from the first portion to a direction orthogonal to the first portion. The second portions are connected to the lens parts  83 , respectively, from the opposite side of the second end  83   b  of the lens parts  83 . 
     The lens parts  83  are formed of transparent resin, for example. Light comes in and goes out from the first end  83   a  and the second end  83   b  of the lens part  83 , and the light reflects inside the lens part  83 . Thus, light which enters the first end  83   a  of the lens part  83  exits outside from the second end  83   b  of the lens part  83 . 
     The lens parts  83  are adhered to the bottom surface  74   a  of the groove  74  by a second double-sided tape (adhering part, adhering layer, stacking portion, fixing portion, attachment portion, waterproofing portion, water-resistant portion)  85 . In other words, the second double-sided tape  85  is interposed between the lens parts  83  and the groove  74 . The second double-sided tape is an example of the first adhering part. Here, the fixing material is not limited to the second double-sided tape  71 , but for example, an adhesive agent or other synthetic resin may be used to fix the lens parts  83  to the groove  74 . The second double-sided tape  85  is waterproof to prevent liquid from entering the inside of the casing  15  through a gap between the lens parts  83  and the groove  74 . 
     A part of the first double-sided tape  71  is adhered to a part of the lens parts  83 . The lens parts  83  are fixed to the panel  68  by the first double-sided tap  71 . That is, the first double-sided tape fixes the panel  68  to the mask  31  and the lens part  83  to the panel  68 . 
     A part of the intermediate part  81  on which the lens parts  83  are placed is blocked by the first double-sided tape  71  and second double-sided tape  85 . That is, the gap between the lens parts  83  and the panel  68  is sealed by the first double-sided tape  71  and a part of the gap between the lens parts  83  and the bottom surface  74   a  of the groove  74  is sealed by the second double-sided tape  85 . That is, the gap between the intermediate part  81  and the lens parts  83  is narrowed by the first and second double-sided tapes  71  and  85 . 
     The first end  83   a  of the lens part  83  is stored in the first opening  73 . The first end  83   a  of the lens part  83  is exposed inside the casing  15  from the first opening  73 . The first end  83   a  of the lens parts  83  forms a flat surface substantially the same with the inner surface  66  of the wall portion  61 . 
     A part of the second end  83   b  of the lens part  83  is stored in the second opening  78 . The second end  83   b  of the lens part  83  is exposed outside the casing  15  from the second opening  78 . The second end  83   b  of the lens part  83  projects from the outer surface of the edge portion  62 . Thereby, the second end  83   b  is easily recognizable by a user. Here, the second end  83   b  of the lens parts  83  may be formed as a recess in the outer surface of the edge portion  62 . 
       FIG. 7  is an exemplary perspective view of disassembled state of a part of the mask  31  and a transparent member  91 . As shown in  FIG. 7 , the transparent member (transparent part, covering part, closing part, waterproof part, water-resistant part)  91  is attached to the inner surface  66  of the wall portion  61 . The transparent member  91  is, for example, a transparent film formed of polyethylene-terephthalate. The transparent member  91  is water resistant and shuts out liquid. 
     As shown in  FIG. 2 , the transparent member  91  covers the first opening  73  and faces the inner surface  66  of the wall portion  61 . The transparent member  91  is fixed to the inner surface  66  by a single third double-sided tape (adhering part, adhering layer, stacking portion, fixing portion, attachment portion, waterproofing portion, water-resistant portion)  92 . In other words, the third double-sided tape  92  is interposed between the inner surface  66  and the transparent member  91 . The third double-sided tape  92  is an example of the second adhering part. Here, the fixing material is not limited to the third double-sided tape  92 , but for example, an adhesive agent or other synthetic resin may be used to fix the transparent member  91  to the inner surface  66 . 
     The third double-sided tape  92  is waterproof to prevent liquid from entering the inside of the casing  15  through a gap between the inner surface  66  of the wall portion  61  and the transparent member  91 . The transparent member  91  blocks the first opening  73  from the inside of the casing  15 . 
       FIG. 8  is an exemplary perspective view showing the transparent member  91  and the third double-sided tape  92 . As shown in  FIG. 8 , a plurality of holes (openings, transparent parts)  94  are provided on the third double-sided tape  92 . The holes  94  are placed at a position corresponding to the first opening  73  and larger than the first opening  73 . 
     The transparent member  91  is formed in a substantially rectangular shape. Some of corners  91   a  of the transparent member  91  are concave. As shown in  FIG. 7 , a pair of convex portions  95  is provided on the inner surface  66  of the wall portion  61 . The concave corners  91   a  of the transparent member  91  engage with the convex portions  95 , respectively. The convex portions  95  are used to position the transparent member  91 . 
     As shown in  FIG. 2 , a plurality of LEDs (parts, implemented parts, light emitting devices)  96  are mounted on a first surface  51  of the module circuit board  48 . The LEDs  96  are an example of electronic components. The LEDs  96  are arranged corresponding to the first openings  73 . The LEDs  96  face the first openings  73 . Furthermore, the LEDs  96  face the first ends  83   a  of the lens parts  83  stored in the first openings  73 . 
     The LEDs  96  emit light with electrification. The electronic components are not limited to the LEDs  96 , and for example, the other electronic components configured to emit light such as organic electroluminescent or optical sensors such as illumination sensor and CMOS sensor. 
     A pressing member (light blocking portion, interposing portion, containing portion)  97  is attached to the first surface  51  of the module circuit board  48 . The pressing member  97  is, for example, a black sponge. A plurality of containing portions (holes, openings, insertion portions)  98  are provided in the pressing member  97 . The containing portions  98  open toward the first openings  73  and the containing portions  98  are holes larger than the first openings  73 . The containing portions  98  store the LEDs  96 , respectively. That is, the pressing member  97  surrounds the LEDs  96 . 
     As shown in  FIG. 2 , in a width direction of the pressing member  97 , the containing portions  98  are closer to the center of the module circuit board  48  as compared to a center of the width direction of the pressing member  97 . In other words, around the containing portions  98 , a part of the pressing member  97  closer to the center of the module circuit board  48  is formed thinner than a part of the pressing member distant from the center of the module circuit board  48 . 
     The pressing member  97  is interposed between the module circuit board  48  and the wall portion  61 . The pressing member  97  contacts the transparent member  91  and presses the transparent member  91  against the wall portion  61 . Furthermore, the pressing member  97  prevents the light from the LEDs  96  from leaking into the inside of the casing  15 . 
     Hereinafter, referring to  FIGS. 9 and 10 , a part of manufacturing a TV  10  is described. The manufacturing method of the TV  10  is not limited to the following process.  FIG. 9  is an exemplary cross-sectional view of the TV  10  and it shows an example of the manufacturing method of the TV  10 .  FIG. 10  is an exemplary perspective view showing base  32  and module circuit board  48  in a disassembled fashion. 
     Firstly, the second double-sided tape  85  is attached to the bottom surface  74   a  of the groove  74  of the mask  31 . Next, as indicated by arrow A 1  in  FIG. 9 , the lens parts  83  are fit in the groove  74  and fixed therein by the second double-sided tape  85 . 
     Then, as shown by arrow A 2  in  FIG. 9 , a panel  68  to which the first double-sided tape  71  is attached is fit in the inside of edge portion  62  of the mask  31 . The panel  68  is fixed to the outer surface  65  of the wall portion  61  by the first double-sided tape  71 . At the same time, the lens parts  83  are fixed to the panel  68  by the first double-sided tape  71 . 
     Then, as shown by arrow A 3  in  FIG. 9 , the transparent member  91  to which the third double-sided tape  92  is attached is fixed to the inner surface  66  of the wall portion  61 . As shown in  FIG. 7 , when the transparent member  91  is fixed to the wall portion  61 , the corners  91   a  of the transparent member  91  are engaged with the convex portions  95 . Thereby, the first opening  73  is sealed by the transparent member  91 . 
     Then, as shown in  FIG. 10 , the module circuit board  48  is attached to the base  32 . The base  32  comprises a pair of bosses (attached parts, fixed portions, supporting portions)  101  and  102 , and rib (engagement portion, convex portion)  103 . The bosses  101  and  102  and rib  103  project from the bottom of the base  32  toward the mask  31 . The rib  103  is provided with the boss  102  integrally. 
     The module circuit board  48  comprises a pair of screw holes (holes, attachment portions, fixing portions)  105  and a slit (groove, concave portions, engagement portions)  106 . The screw holes  105  correspond to the bosses  101  and  102 . The slit  106  corresponds to the rib  103 . 
     The module circuit board  48  is placed on the bosses  101  and  102 . At that time, the rib  103  fits in the slit  106  of the module circuit board  106 . Furthermore, an operation portion  55  of the switch  54  mounted on the module circuit board  48  faces a projection  39  of the keypad  38 . 
     A plurality of fasteners  108  such as, for example, screws are screwed in the bosses  101  and  102  through the screw holes  105 . Thereby, the module circuit board  48  is fixed to the bosses  101  and  102  of the base  32 . Here, the module circuit board  48  may be fixed to the base  32  by other methods, such as using a hook as a fastener. 
     Then, as shown by arrow A 4  in  FIG. 9 , the mask  31  is attached to the base  32 . The mask  31  is fixed to the base  32  with a hook or a screw. Thereby, the pressing member  97  elastically contacts the transparent member  91  and presses the transparent member  91  to the wall portion  61 . The TV  10  is manufactured by such a process as mentioned above. 
     In the TV  10  structured as above, light from the LEDs  96  passes through the transparent member  91  and enters the first end  83   a  of the lens part  83 . The light reflects inside the lens part  83  placed on the intermediate part  81  between the first opening  73  and the second opening  78 , and the light exits from the second end  83   b  of the lens part  83 . That is, when the LEDs emit light, the second end  83   b  of the lens part  83  emits the light. By lighting up the second ends  83   b  of the lens parts  83 , the TV  10  informs a user of various states such as power on/off state, preset recording/viewing on/off state, communication state and processing state. 
     If liquid such as water is splashed on a periphery of the second openings  78 , the liquid may enters the second openings  78 . Since a part of the intermediate part  81  is sealed by the first and second double-sided tapes  71  and  85 , at least a part of the liquid entering therein is blocked in the intermediate part  81 . Even if the liquid passes through the intermediate part  81 , the liquid is blocked by the transparent member  91  and the third double-sided tape  92 . The liquid blocked by the transparent member  91  and the third double-sided tape  92  is evaporated by a heat generated by, for example, the LEDs  96  and the other electronic components and ejected out of the casing  15  from the second openings  78 . 
     As described above, the first openings  73  are sealed by the transparent member  91  fixed to the wall portion  61  from the inside of the casing  15 . Thereby, liquid such as water is prevented from entering inside the casing  15  from the first openings  73 . That is, even the TV  10  whose design exposes the lens parts  83  out of the casing  15  can resist intrusion of liquid. Since it is unnecessary to cover watertightly the lens parts  83  from the outside of the casing  15 , design of the waterproof structured TV  10  can be carried out with a great degree of freedom. 
     The lens parts  83  comprising the first ends  83   a  stored in the first openings  73  are fixed to the casing  15  by the waterproofing first and second double-sided tapes  71  and  85 . Thereby, a part fixing the lens parts  83  is waterproofed, and the waterproof characteristic of the TV  10  is improved. Furthermore, by fixing the lens parts  83  with the first and second double-sided tapes  71  and  85 , vibration of the lens parts  83  can be reduced. 
     The first and second double-sided tapes  71  and  85  block at least a part of a gap between the intermediate part  81  and the lens parts  83 . Thereby, liquid such as water is prevented from entering inside the casing  15  through the gap between the intermediate part  81  and the lens parts  83 . 
     The transparent member  91  is fixed to the waterproof third double-sided tape  92  to the wall portion  61 . Thereby, a part fixing the transparent member  91  to the wall portion  61  is waterproofed, and the waterproof characteristic of the TV  10  is improved. 
     At least a part of the second opening  78  is placed at a position shifted from the first opening  73 . Thereby, a liquid such as water tends to stay between the second opening  78  and the first opening  73  and the liquid such as water is prevented from entering inside the casing  15 . 
     The second opening  78  is defined by the notched portion  76  on the edge portion  62  and the panel  68 . Thereby, the lens parts  83  are easily attached and the TV  10  is easily manufactured. 
     The casing  15  comprises the intermediate part  81  connecting between the first openings  73  and the second openings  78 . The first and second double-sided tapes  71  and  85  cover at least a part of the intermediate part  81 . Thereby, liquid such as water is prevented from entering inside the casing  15  through the gap between the intermediate part  81  and the lens parts  83 . 
     The intermediate part  81  is formed by the mask  31  comprising the groove  74  and the panel  68  covering the groove  74 . The first double-sided tape  71  fixes the panel  68  to the mask  31  and the lens parts  83  to the panel  68 . Thereby, material costs of the TV  10  are reduced and manufacturing steps are also reduced. 
     The pressing member  97  comprising containing portions  98  to store the LEDs  96  presses the transparent member  91  to the wall portion  61 . Thereby, the pressing member  97  prevents the transparent member  91  from peeling off from the wall portion  61  and a liquid such as water from entering inside the casing  15  though a gap between the transparent member  91  and the wall portion  61 . Furthermore, the pressing member  97  prevents light leakage from the LEDs  96 , and thus, material costs of the TV  10  are reduced. 
     The grove  74  comprises the steps  77 . The steps  77  hold liquid such as water therein. Thereby, a liquid such as water is prevented from entering inside the casing  15 . 
     Around the containing portion  98 , a part of the pressing member  97  closer to the center of the module circuit board  48  is formed thinner than a part of the pressing member distant from the center of the module circuit board  48 . Thereby, a region of the module circuit board  48  where electronic components are mountable is formed wider. 
     When the LEDs  96  emit light, the second ends  83   b  of the lens parts  83  emit the light. Thus, while a liquid such as water is prevented from entering inside the casing  15 , the second ends  83   b  of the lens parts  83  exposed outside the casing  15  can be lite. 
     Here, instead of the LEDs  96 , the TV  10  may comprise an optical sensor such as, for example, an illumination sensor and CMOS sensor. The TV  10  comprising such the optical sensor can detects brightness of the outside of the casing  15  and photograph an image of the outside of the casing  15  while preventing liquid, such as water, from entering inside the casing  15 . 
     Hereinafter, referring to  FIGS. 11 and 14 , the second embodiment is described. Here, in the embodiment disclosed below, the same reference numerals are applied to structural elements having the same function as that of the TV  10  in the first embodiment. Furthermore, a part of or the entire explanation of such structural elements may be omitted. 
       FIG. 11  is an exemplary perspective view of a tablet computer (personal computer, tablet PC, electronic apparatus)  131  according to the second embodiment.  FIG. 12  is an exemplary perspective view showing a part of the tablet computer  131  enlarged. The tablet computer  131  is an example of a waterproof structure. 
     As shown in  FIG. 11 , the tablet computer  131  comprises a casing  15 . The casing  15  comprises a mask  31  forming a front surface  21  of the casing  15  and a base  32 . The base  32  comprises a sidewall  34  forming a side surface of the casing  15 . 
     The front surface  15  of the casing  15  comprises a camera part (portion, region)  133 . The camera part  133  comprises a camera opening  134 , flash opening  135  and sensor opening  136 . 
       FIG. 13  is an exemplary perspective view of the tablet computer  131  in a disassembled fashion. As shown in  FIG. 13 , the camera part  133  is provided upon a panel  68 . The panel  68  is formed of, for example, a glass panel attached with an electrostatic touchpanel. 
     The camera opening  134  exposes at least a part of a camera unit  138  stored inside the casing  15 . The camera unit  138  comprises an optical sensor such as CMOS sensor and a lens. The flash opening  135  exposes a lens  139 , for example. The lens  139  is illuminated by a light emitting device such as an LED stored inside the casing  15 . The sensor opening  136  exposes, for example, the other lens  140 . The lens  140  guides light outside the casing  15  to an optical sensor such as an illumination sensor stored inside the casing  15 . 
     As shown in  FIG. 12 , a button member  36  which is, for example, a power button projects from the sidewall  34 . As in the first embodiment, the button member  36  is inserted into a button opening  35  on the sidewall  34 . The button opening  35  is covered by a keypad  38 . The keypad  38  is pressed against the sidewall  34  by a retainer  43  of a fixing member  41 . 
     The panel  68  and notched portions  76  on a edge portion  62  form three second openings  78 . Each of the second openings  78  exposes second end  83   b  of the lens part  83 . The panel  68  displays a plurality of diagrams corresponding to the lens parts  83  exposed from the second openings  78 . 
       FIG. 14  is an exemplary perspective view showing a part of the disassembled tablet computer  131  enlarged. As shown in  FIG. 14 , a part of the lens part  83  facing the panel  68  forms a flat surface substantially the same as an outer surface  65  of the wall portion  61 . 
     In the tablet computer  131  with the structure mentioned above, as in the first embodiment, the first openings  73  are sealed by the transparent member  91  fixed to the wall portion  61  from the inside of the casing  15 . Thereby, liquid such as water is prevented from entering inside the casing  15  from the first openings  73 . That is, even the tablet computer  131  whose design exposes the lens parts  83  out of the casing  15  can resist intrusion of a liquid. Thus, design of the waterproof structured tablet computer  131  can be carried out with a great degree of freedom. 
     As mentioned above, the waterproof structure is not limited to the TV  10  or the tablet computer  131 , but applicable to other electronic apparatuses such as, for example, a portable computer, a personal digital assistant (PDA), a cellular phone, and a smartphone. 
     Hereinafter, referring to  FIG. 15 , the third embodiment is described.  FIG. 15  is an exemplary cross-sectional view showing a part of the tablet computer  131  according to the third embodiment. In the third embodiment, a sensor opening  136  is an example of the second opening and a lens  140  is an example of a lens part. 
     An illumination sensor  145  is mounted on a first surface  51  of a module circuit board  48 . The illumination sensor  145  is an example of electronic components and optical sensor. The illumination sensor  145  faces the first opening  73 . 
     The lens  140  is arranged on the intermediate part  81  between the first opening  73  and the sensor opening  136 . The lens  140  comprises a first end  140   a  stored in the first opening  73  and a second end  140   b  exposed outside the casing  15  from the sensor opening  136 . 
     In the tablet computer  131  with the structure mentioned above, as in the first embodiment, the first opening  73  is sealed by the transparent member  91  fixed to the wall portion  61  from the inside of the casing  15 . Thereby, even the tablet computer  131  whose design exposes the lens  140  out of the casing  15  can resist intrusion of liquid, and thus, design of the waterproof structured tablet computer  131  can be carried out with a great degree of freedom. 
     As mentioned above, the second opening may be the second opening  78  exposing the lens part  83  illuminated by the LED  96 , the sensor opening  136  exposing the lens  140  guiding light to the illumination sensor  111 , or the like. The second opening may be the other openings such as, for example, the camera opening  134  exposing the camera unit  138  and the flash opening  135  exposing the lens  139  illuminated by the light emitting device. 
     The term “waterproof” used in the present specification is not limited to total blocking of intrusion of liquid. The term “waterproof” includes, meanings of, for example, preventing intrusion of liquid, packing, shutting up liquid, making a dam, filling up a gap, partially (temporally) stopping water running, etc. Furthermore, the term “waterproof” includes a simple “narrowed part in a passage”. 
     While certain embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the embodiments described herein may be made without departing from the spirit of the inventions. The accompanying claims and their equivalents are intended to cover such forms or modifications as would fall within the scope and spirit of the inventions. 
     For example, in the embodiments described above, the mask  31  and panel  68  are introduced as an example of the first and second parts. However, the present invention is not limited thereto. Specifically, the base  32  may be an example of the first part and the mask may be an example of the second part. 
     Furthermore, the first and second double-sided tapes  71  and  85  may seal the entire part of the intermediate part  81 . Furthermore, the first opening  73  and the second opening  78  may be overlapped with each other. The electronic component is not limited to light emitting devices such as LED  96  or an optical sensor such as illumination sensor  111 , but may also be other component such as a connector and a speaker.