Abstract:
An electronic apparatus includes a housing made of a first material, a functional member that is provided in the housing, is made of a second material, and has a predetermined function; and a shield that is made of the first material and hides the functional member, wherein the shield has an invisible perforation part in the shield, the perforation part being to be perforated by an external member in removing the shield from the housing.

Description:
This application is a continuation based on PCT International Application No. PCT/JP2003/001390, filed on Feb. 10, 2003, which is hereby incorporated by reference herein in its entirety as if fully set forth herein. 

   BACKGROUND OF THE INVENTION 
   The present invention relates generally to an electronic apparatus, and more particularly to a shield that hides a member, such as a screw, from the outside. The present invention is suitable, for example, for a screw cap that hides a screw used to fix a housing of a portable terminal, such as a cellular phone, a personal handy phone system (“PHS”), and another mobile communication terminal (which are generally referred to as a mobile wireless communication apparatus in this application), a personal digital assistant (“PDA”), and a laptop personal computer (“PC”). The present invention is broadly applicable to an electronic apparatus in addition to the portable terminals, and does not limit an object to be hidden by the shield to the screw. 
   Recent electronic apparatuses, such as a portable electronic terminal (e.g., a cellular phone and a PDA) are required to have a small, low-profile and lightweight body for portability convenience, as well as having an improved design (or ornamental appearance), economical efficiency, and maintainability to meet users&#39; preferences. 
   For example, a housing or case of a cellular phone includes screwed front and rear cases. The case is typically made of resin, patterned and colored, while the screw is made of metal, which is a different material from the case, and has a metallic color. The screws when visible on the case is so conspicuous that a user may tend to disassemble and convert the housing, undesirably jeopardizing the safety of the cellular phone. Therefore, a screw cap conventionally hides the screw that fixes the case and its vicinity, which are collectively referred to as a “screw part” hereinafter. 
   Referring now to  FIGS. 7A to 9 , a description will be given of the conventional screw cap  10 . Here,  FIG. 7A  is a side view of the screw cap  10 , and  FIGS. 7B and 7C  are perspective views of the screw cap  10  viewed from different angles.  FIG. 8  is a plane view with partially enlarged screw caps  10  that cover the screws (not shown) in a cellular phone  2 .  FIG. 9  is a perspective view for explaining a removal of the screw cap  10 . 
   The conventional screw cap  10  has an approximately triangle shape and includes, as shown in  FIG. 7 , a chamfered, approximately triangle top  12 , a bevel  14  at the edge, and a bottom  15 . A notch  16  is formed at the center of the bevel  14 . In assembly, a double-sided tape is adhered to the bottom  15  of the screw cap  10 , and the screw caps  10  are then attached to screw parts  4 , a pair of right and left dents, in the cellular phone  2  as shown in  FIG. 8 . The screw cap  10  covers the screw part  4  and does not expose the screw under the top  12 . The top  12  is level with the case, and made of the same material and color as those of the case  6 , maintaining the design or appearance continuity at the screw parts  4 . 
   In disassembly of the case  6  by detaching the screws for maintenance, the screw caps  10  are removed from the case  6  so as to expose the screws. In removing the screw caps  10  from the case  6 , a pointed tool  20  is inserted into the notch  16  in the screw cap  10 , as shown in  FIG. 9 , and an upper force is applied via the tip of the tool  20  against the adhesion of the double-sided tape by leverage. 
   The screw cap itself is also known in the art unrelated to the art of the inventive electronic apparatus. See, for example, Japanese Patent Applications, Publication Nos. 2000-16224 (elements 32 a  and 32 b  in FIG. 1 and Paragraph Nos. 0024 and 0029), and 2000-300720 (screw caps 150 and 157 in FIGS. 1, 4 and 7). 
   Disadvantageously, in inserting the tool  20  into the notch  16  in the screw cap  10  and removing the screw cap  10  from the case, the edge of the case  6  opposing to the notch  16  may possibly get damaged. Since the notch  16  is provided at the boundary with the case  6 , the tool  20  inserted into the notch  16  easily damages the edge of the case  6  opposing to the notch  16 . The fulcrum of the leverage is the edge of the case  6  opposing to the notch  16 , and the tool  20  inserted into the notch  16  and powered easily damages the edge of the case  6  opposing to the notch  16 . In particular, the typical tool  20  often uses metal tweezers, which is stronger than the resin case  6 , and easily damages the case  6 . In removing the screw cap  10 , the tool  20  is forced onto the bottom  15  of the screw cap  10 , and the screw cap  10  gets damaged. Therefore, the screw cap  10  is replaced at the maintenance. However, if the case  6  gets damaged and needs a replacement, the cost would increase. The maintenance that does not damage the case  6  needs skills and a longer maintenance time period. Thus, the conventional screw cap  10  has the bad maintainability (or disassembly performance). In particular, as the screw cap  10  becomes smaller and thinner for a smaller and thinner housing, the operability lowers remarkably. 
   The instant inventors have reviewed arranging a perforation hole in the (top surface of the) screw cap  10  instead of arranging the notch  16  around the screw cap  10 . This configuration can protect the edge of the case  6  from damages in inserting the tool  20  into the perforation hole and removing the screw cap  10  by leverage. However, the perforation hole in the screw cap  10  highlights the screw cap  10  and generally deteriorates both the appearance continuity and safety, due to a double hole effect of the perforation hole and the dent hole into which the screw cap  10  is inserted. The screw cap  10  is preferably quiet for both the appearance continuity and safety. In addition, the perforation hole in the top surface  10  exposes the screw through the hole, contrary to the objective of the provision of the screw cap  10 . 
   Instead of the metal tweezers for the tool  20 , it is also conceivable to use a resin material similar to that of the case  6  or a softer material so as to prevent damages of the case  6 . This measure, however, is impracticable since the double-sided tape has a comparatively strong adhesion and easily breaks a tip of the resin member. On the other hand, if the adhesion of the double-sided tape is made weaker so that the screw cap  10  is easily removed, the screw cap  10  would be undesirably removed from the cellular phone  2  and may possibly be lost at the non-maintenance time, for example, when an impact is applied to the cellular phone  2 . 
   In addition, like the screw caps  10 A and  10 B in  FIG. 8 , a pair of screw caps  10  are not formed in bilateral symmetry because they have notches  16 A and  16 B at different positions. Due to the manufacture of these two differently shaped screw caps  10 A and  10 B, the conventional screw cap has the bad manufacturing performance, and increases the manufacturing cost. 
   BRIEF SUMMARY OF THE INVENTION 
   Accordingly, it is an object of the present invention to provide a shield and an electronic apparatus having the same, which improves the economical efficiency of and maintainability of the electronic apparatus, in which the above disadvantages are eliminated. 
   An electronic apparatus according to one aspect of the present invention includes a housing made of a first material, a functional member that is provided in the housing, is made of a second material, and has a predetermined function, and a shield that is made of the first material and hides the functional member, wherein the shield has an invisible perforation part in the shield, the perforation part being to be perforated by an external member in removing the shield from the housing. According to this electronic apparatus, the shield hides the functional member, and is removed when a sharp tool pierces through the perforation part, like a lid of milk bottle. Since the perforation part is located inside the shield, the sharp tool does not damage the housing or require a replacement of the housing when the sharp tool perforates through the perforation part and removes the shield by leverage because the sharp tool uses the perimeter of the perforation part as a fulcrum instead of using the housing as a fulcrum. The easy removal of the shield improves the operability. The invisible perforation part maintains the appearance continuity of the housing. 
   An electronic apparatus according to another aspect of the present invention includes a housing made of a first material, a functional member that is provided in the housing, is made of a second material, and has a predetermined function, and a shield that is removably provided to the housing, is made of the first material and hides the functional member, wherein the shield has no hole used to remove the shield from the housing. According to this electronic apparatus, the shield has no hole for removal, such as a perforation hole and a notch, lessens the likelihood of the disassembly and conversion of the housing, improving the safety. A removal of the shield may use a perforation of a sharp tool and other methods, such as use of a double-sided tape and a press button. Anyway, the housing does not get damaged in removing the shield, and the removal of the shield does not damage the housing or require a replacement of the housing. 
   An electronic apparatus according to still another aspect of the present invention includes a housing made of a first material, a functional member that is provided in the housing, is made of a second material, and has a predetermined function, and a shield that is made of the first material and hides the functional member, wherein a fulcrum of a power applied in removing the shield from the housing is located inside the shield. This electronic apparatus arranges the fulcrum inside the shield, and definitely protects the housing from damages in comparison with the prior art that arranges the fulcrum at the boundary between the housing and the shield or outside the shield, such as on the housing. 
   The shield may have a sectionally concave shape at the perforation part, and is configured to be perforated at a concave of the perforation part. The shield may be made, for example, of resin, and a thickness of the perforation part is set, for example, to about 0.6 mm or smaller. A thin-walled structure of the perforation part facilitates the perforation by the sharp tool in removing the shield from the housing. The shield may have a symmetrical shape. Thereby, it is unnecessary to prepare plural types of shields in arranging the shields at left and right portions, improving the manufacturing performance and economical efficiency. The functional member is preferably located under the perforation part. For example, in removing the shield from the housing by piercing the sharp tool through the shield, the sharp tip is prevented from damaging the housing by inserting the sharp tool near the functional member, such as a screw. 
   The perforation part is preferably located at a center of the shield. For example, in removing the shield from the housing by piercing the sharp tool through the shield, the housing is protected from damages since the perforation part is not located at the boundary between the shield and the housing. 
   The electronic apparatus may be a mobile wireless communication apparatus, and the functional member is a screw used to fix the housing, wherein the electronic apparatus may further include a display that displays communication information, wherein the housing includes a first housing that has the display on a first surface, and a second housing that has an operating part used to input the communication information, wherein the first housing is connected rotatably to the second housing, and the shield is provided to the first housing on the first surface. The first housing as a movable part attracts the user&#39;s attention in comparison with the second housing as a fixed part. Such a foldable mobile wireless communication apparatus often utilizes screws for fixture. As discussed above, the mobile wireless communication apparatus covers a cellular phone, a personal handy phone system (“PHS”), and another mobile communication terminal. 
   The above shield constitutes another aspect of the present invention. 
   Other objects and further features of the present invention will become readily apparent from the following description of the embodiments with reference to accompanying drawings. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a front view of a cellular phone to which a screw cap according to one aspect of the present invention is attached. 
       FIG. 2  is a rear view of the cellular phone shown in  FIG. 1 . 
       FIG. 3  is a front view of the cellular phone shown in  FIG. 1  from which the screw cap is removed. 
       FIG. 4  is a schematic sectional view of the cellular phone shown in  FIG. 1 . 
       FIGS. 5A and 5B  are sectional and rear views of the screw cap shown in  FIG. 1 . 
       FIGS. 6A and 6B  are sectional views for explaining a method for removing the screw cap shown in  FIG. 1 . 
       FIGS. 7A-7C  are side and perspective views of a conventional screw cap. 
       FIG. 8  is a partial plane view with a pair of partially enlarged screw caps in a conventional cellular phone. 
       FIG. 9  is a perspective view for explaining a removal of the screw cap shown in  FIG. 8 . 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   A description will now be given of a cellular phone  100  as one aspect of the present invention, with reference to the accompanying drawings.  FIG. 1  is a front view of the cellular phone  100 .  FIG. 2  is a rear view of the cellular phone  100 .  FIG. 3  is a front view of the cellular phone  100  with a screw cap  200  detached.  FIG. 4  is a schematic sectional view of the cellular phone  100 . 
   While the cellular phone  100  is one illustrative electronic apparatus according to one aspect of the present invention, the present invention does not limit the electronic apparatus to the cellular phone. In addition, while the cellular phone  100  of this embodiment is a foldable cellular phone, the present invention does not limit the cellular phone to the foldable type. 
   The cellular phone  100  connects a movable part  110  to a fixed part with a hinge mechanism  130 . As a result, the movable part  110  is rotatable around the fixed part  120 . More specifically, a user can fold the movable part  110  onto the fixed part  120  by rotating the movable part  110  in a front direction in  FIG. 1  during a non-use time of the cellular phone  100 . In using the cellular phone  100 , the movable part  110  can be unfolded from the fixed part  120  by rotating the folded movable part  110  in the back direction in  FIG. 1 . 
   The movable part  110  has a housing structure, as shown in  FIG. 4 , which combines a front case  112  with a rear case  114  through screws  148 , and includes a display  140 , a microphone  142 , an antenna  146 , and screws  148 . 
   The movable part  110  is made, for example, of resin by injection molding. The display  140  is an LCD that displays communication information, such as outgoing information, incoming information, address book information, information input by an operating part  150 , and other various types of information. The microphone  142  outputs communicatee&#39;s voices. The antenna  146  includes a helical antenna, and is used to communicate with a base station. These and other elements in the movable part  110 , such as an internal antenna and an image pickup device, can apply any technologies known in the art, and a detailed description thereof will be omitted. 
   The screws  148  are inserted into screw holes formed in concaves  116  and  118  of the movable part  110 , as shown in  FIGS. 3 and 4 , and engaged with a nut  149  provided in these screw hole. The screws  148  combine the front case  112  with the rear case  114 . The screw  148  is made of metal, which is a different material from that of the movable part  110 . Since the movable part  110  is patterned, colored and shaped in accordance with users&#39; preferences, the screws  148  if exposing stand out, jeopardizing both the safety and the appearance continuity of the housing. Therefore, the screw caps  200 A and  200 B cover the concaves  116  and  118  as shown in  FIG. 1 , and hide the screws  148 . Unless otherwise specified, the reference numeral  200  generalizes reference numerals  200 A and  200 B. 
   Referring to  FIG. 3 , when viewed from the top, a pair of teardrop shaped concaves  116  are arranged symmetrically, and a pair of approximately triangular concaves  118  are arranged symmetrically. The screws  148  inserted into the pair of concaves  116  fix the upper part of the movable part  110 , and the screws inserted into the pair of concaves  118  fix the lower part of the movable part  110 . The concaves  116  and  118  have a size of 1 mm. 
   The screw cap  200  has, as shown in  FIGS. 4 ,  5 A and  5 B, a base  204  and a thin-walled part  206 . Here,  FIG. 5A  is a rear view of the screw cap  200 , and  FIG. 5B  is a sectional view taken along a line A-A in  FIG. 5A . Although the screw cap  200  shown in  FIGS. 5A and 5B  corresponds to the screw cap  200 A inserted into the concave  116 , the same discussion is applicable to the approximately triangle screw cap  200 B inserted into the concave  118 . Of course, the shape of the screw cap  200  is illustrative. 
   The screw cap  200  serves to hide the screw  148  below the screw cap  200 . A veil of the screw maintains the appearance continuity of the housing without providing the user with the motives for unfastening of the screw and disassembly of the housing. 
   The screw cap  200  serves to maintain the appearance continuity of the housing above the concaves  116  and  118  as well as veiling the screw  148 . Therefore, the screw cap  200  is made of the same material (such as resin in this embodiment), color, shape, and design as those of the housing (at the side of the display  148  of the movable part  110 ). Preferably, the screw cap  200  is fused with the housing so that it is inconspicuous and maintains the appearance continuity of the housing. 
   The screw cap  200  has a flat top surface  202  with no notch or perforation used for removal, such as the conventional notch  16 . The flat surface is preferable to maintain the appearance continuity of the housing of the cellular phone  100 . Of course, the top surface  200  may be shaped, patterned and colored in accordance with the shape of the cellular phone  100 . Since the flat surface veils the thin-walled part  206 , the user is unlikely to remove the screw cap  200  for disassembly and conversion. 
   The base  204  exemplarily has a uniform thickness of about 1 mm in this embodiment, and the thin-walled part  206  at almost the center of the base  204 . A size of the base  204  is set in accordance with the necessary adhesion. As described later, the screw cap  200  is fixed onto the front case  110  via the double-sided tape  250 , but the screw cap  200  is not generally fixed onto the front case  110  in a range of the thin-walled part  206 . Therefore, if the base  204  is too small, the adhesion becomes too low to fix the screw cap  200  onto the housing, for example, when an impact is applied to the cellular phone  100 , causing a loss of the screw cap  200 . On the other hand, if the base  204  is too large, the adhesion becomes too strong to smoothly peel off the screw cap  200  with the tool  20 , such as tweezers, causing a tear of the screw cap  200  during the peeling off or making the peeling difficult. 
   Of course, the present invention does not limit a removal of the screw cap  200  to the perforation using the tool  20 . As long as the housing does not get damaged, any removing methods may be used. For example, a double-sided tape (not shown) may be adhered to the top surface  202  to lift up the screw cap  200  by using the adhesion between the top surface  202  and the double-sided tape. Alternatively, a press button mechanism that utilizes a compression spring may be used. The base  204  is adhered to the top of the press button so that one press fixes the screw cap  200  onto the housing and another press projects the screw cap  200  from the housing. A user can pinch and remove the projected screw cap  200  with a thumb and forefinger. The top surface  202  may have a projection and another shape so that the tweezers can lift the projection or the screw cap  200  may have a cork structure used for a wine bottle. 
   The thin-walled part  206  is a perforation part to be perforated in removing the screw cap  200  in this embodiment. However, as discussed above, the present invention does not limit the removal of the screw cap  200  to the perforation. The thin-walled part  206  serves to cover (the screw head of) the screw  148 . This is because the tip of the tool  20  that pierces the screw cap  200  does not damage the housing when the screw  148  is located below the thin-walled part  206 . The thin-walled part  206  has an illustratively circular shape when viewed from the bottom, and the circle has a diameter of about 5 mm in this embodiment. This diameter is set enough to cover (the screw head) of the screw  148 . 
   The thin-walled part  206  in this embodiment has an illustratively uniform thickness of 0.6 mm or smaller, for example, about 0.5 mm, and forms a concave from the base  204  as shown in  FIG. 5B . The thickness of 0.6 mm or smaller can facilitate the perforation by the tool  20 . The thickness of the thin-walled part  206  is set thinner than the base  204  so that the tool  20  can easily pierces through the thin-walled part  20  in removing the screw cap  200 . Alternatively, when a material is properly selected, the thin-walled part  206  is not necessary and may have the same thickness as that of the base  204 . 
   The thin-walled part  206  is decentered to the left as shown in  FIG. 5B  in this embodiment so as to weaken the adhesion at the left side in  FIG. 5B . In this embodiment, as shown in  FIG. 6 , which will be described later, the tool  20  is inserted into a portion that is decentered to the left side, and applies the force to peel off the base  204  at the right side as shown in  FIG. 6 . Therefore, if the adhesion at the left side is too strong, the left base  204  remains even after the right base  204  is peeled off. This requires a user to pinch the base  204  at the right side and to peel off the base  204  at the left side, lowering the operability. Nevertheless, even if the thin-walled part  206  is centered in  FIG. 5B , the left adhesion can be weaker by lessening the amount of the double-sided tape  250  under the base  204  at the left side and weakening the left adhesion. Therefore, the decentering of the thin-walled part  206  is not vital for the present invention. While the thin-walled part  206  is invisible when viewed from the top surface  202  in this embodiment, the present invention does not preclude recognition of the thin-walled part  206  when the thin-walled part  206  is viewed from the top surface  202 . 
   The screw cap  200  of this embodiment is made, for example, by injection molding. Unlike the conventional screw cap  10 , the same screw cap  200  is applicable to a pair of concaves, such as the pair of concaves  116 . The injection molding can use the same mold, and facilitates the manufacture of the screw cap  200 . In addition, the screw cap  200  has no notch  16  or no perforation hole for removal unlike the prior art. A projection that forms the notch and perforation hole in the mold is unnecessary, and a production of the mold becomes easier. The screw cap  200  of this embodiment thus improves the manufacturing performance and reduces the manufacture cost. 
   In attaching the screw cap  200 , a double-sided tape that has a shape corresponding to the (teardrop or triangular) concaves  116  and  118  shown in  FIG. 3  is adhered to the back surface of the screw cap  200 , and then the screw cap  200  is adhered to the concaves  116  and  118 . Of course, the screw cap  200  may be adhered after the double-sided tape is adhered to the concaves  116  and  118 . 
   The fixed part  120  includes the operating part  150 , a pair of recesses  162 , a microphone  160 , a speaker  170 , an earphone terminal  172 , and a battery part  174 . 
   The fixed part  120  is made of a material similar to that of the movable part  110 , and includes a front case and a rear case. The fixed part  120  may use the screws  148 , like the movable part  110 , and the screw cap  200  to hide the screws  148 . However, this embodiment does not provide the fixed part  120  with the screw cap  200 , because the appearance continuity of surfaces that have the display  148  and the operating part  150  (referred to as a “primary outer surface”), in particular, a surface that has the display  148 , is generally more important for users than its back surface (also referred to as a “secondary outer surface”). Of course, the present invention does not prevent the fixed part  120  and the back surface of the movable part  110  shown in  FIG. 1  from having the screw cap  200 . 
   The operating part  150  exemplarily includes a trackball type operating part  152  and a ten-key operating part  154 , and enters the communication information. The pair of recesses  162  receive the screw cap  200 A when the movable part  110  is folded onto the fixed part  120 . The microphone  160  is a portion through which a user inputs the voices. The speaker  170  outputs the incoming call sound. The terminal  172  is connectible to the earphone. The battery part  174  stores a battery. This embodiment arranges (upper) screws that combine the front case with the rear case of the fixed part  120  under the battery part  174 , the battery part  174  hides the screws, and therefore no screw cap  200  is provided. The battery part  174  needs a predetermined thickness, and the fixed part  120  is necessarily thicker than the movable part  110 . Since the fixed part  120  has a sufficient thickness, rubber hides, at a portion  176  shown in  FIG. 2 , (lower) screws that connect the front case to the rear case in the fixed part  120 . Use of the rubber is permitted since the rear surface is the secondary outer surface that does not have to maintain the appearance continuity. On the other hand, the rubber is inapplicable to the screw cap  200  due to the technical reason that the 1 mm-thick rubber is easily peeled off in addition to the appearance continuity reason. As discussed, the present invention does not prevent an application of the screw cap  200  to the portion  176 . The member provided to the fixed part  120  may use any technologies known in the art, and a detailed description thereof will be omitted. 
   The hinge mechanism  130  rotatably connects the movable part  110  with the fixed part  120 . The hinge mechanism  130  may use any technologies known in the art, and a detailed description thereof will be omitted. 
   The cellular phone  100  of this embodiment thus uses the screw caps  200  to hide the screws  148 , and to maintains the appearance continuity of the movable part  110  at the side of the display  140 , which attracts the user, when the movable part  110  is unfolded from the fixed part  120 . Thereby, the user does not feel the conspicuousness of the screws  148 . In particular, the screw cap  200  has the flat top surface  202  with no notch  16  or no perforation hole for removal unlike the prior art, and effectively maintains the appearance continuity of the housing, lessening the likelihood of the motives for disassembly and conversion of the housing. 
   Referring now to  FIG. 6 , a description will be given of a removal of the screw cap  200  from the cellular phone  100 . Here,  FIGS. 6A and 6B  are sectional views for explaining the method for removing the screw cap  200 . More specifically,  FIG. 6A  shows that the sharp tool  20  pierces through the screw cap  200 , and  FIG. 6B  shows a removal of the screw cap  200  using the tool  20  by leverage subsequent to the state shown in  FIG. 6A . 
   The screw cap  200  is removed by a manufacturer or a consignee (collectively referred to as an “authorized person” hereinafter) when the authorized person needs to disassemble the front case  112  from the rear case  114  of the housing for inspection, maintenance and replacement of an internal member. 
   In removing the screw cap  200 , the tool  20 , such as tweezers, is used similarly to the prior art. In using the tweezers, only one tip is used. As discussed above, when the screw cap  200  is viewed from the top, the veil of the thin-wall part  206  lessens the likelihood of the removal of the screw cap  200  for the disassembly and conversion. However, the authorized person previously knows the location of the thin-wall part  206 , and pierces the tool  20  through the thin-wall part  206 , as shown in  FIG. 6A . The authorized person pierces the tool  20  until the tool  20  pierces the double-sided tape  250  (or until the tool  20  contacts the screw head of the screw  148  under the double-sided tape  250 ). As discussed above, since the thin-wall part  206  decenters from the screw cap  200 , the piercing direction of the tool  20  is a direction from the center to the outside of the front case  112 . Since the thin-wall part  206  is located in the screw cap  200 , the front case  112  does not get damaged when the tool  20  pierces the thin-wall part  206 . 
   Next, the authorized person lifts up the screw cap  200 , as shown in  FIG. 6B , by leverage, by slightly squeezing the tip of the tool  20  into a portion under the base  204  and lifting the base  204 . At the left side of the screw cap  200  in  FIG. 6B , the base  204  contacts the double-sided tape  205  in a small area and the adhesion is small. Therefore, the authorized person can remove the screw cap  200  from the housing simultaneous with the lifting action of the screw cap  200 . The tool  20  may contact and scars the front case  112  under the base  204 , but this scar is invisible after a new screw cap  200  is attached. 
   Thus, when the screw cap  200  is removed by leverage after the tool  20  pierces the thin-wall part  206 , the tool  20  uses the perimeter of the perforation hole in the thin-walled part  206  as a fulcrum rather than the housing. Therefore, the housing gets no damages or needs no replacement as a result of the removal of the screw cap. In addition, the screw cap  20  can be removed more quickly than the prior art method that removes the screw cap  10  deliberately so as not to damage the housing. 
   The authorized person then removes the screws  148 , disassembles the front case  112  from the rear case  114  for inspections, maintenance, and replacement of an internal part, and then fixes the front case  112  onto the rear case  114  using the screws  148 . Thereafter, in the procedure similar to the above, a new screw cap  200  is attached to the housing via the double-sided tape  250 . 
   Further, the present invention is not limited to these preferred embodiments, and a various variations and modifications may be made without departing from the spirit and scope of the present invention. For example, while the instant embodiment discusses the cellular phone as one example of the electronic apparatus, the present invention is applicable to various types of electronic apparatuses, such as a laptop PC, a PDA, a digital camera, and a game machine. In addition, unlike the screw cap  200  of the instant embodiment, the inventive shield does not necessarily maintain the appearance continuity of the housing. As long as the present invention can prevent damages of the housing during the removal of the screw cap  200 , another modification may be made. For example, a perforation for removal may be provided inside the screw cap  200 , not around the screw cap  200 , so that the screw does not expose under the screw cap  200 . 
   The present invention can provide a shield and an electronic apparatus having the same, which improve the economical efficiency of and maintainability of the electronic apparatus. The present invention is especially suitable for an environment that should maintain the appearance continuity of the housing of the electronic apparatus.