Abstract:
A strap mounting space is formed around a boss formed on an upper cover and a lower cover which, when assembled together, form a case for an apparatus. One, or each, of the upper cover and the lower cover is/are formed integrally with a respective boss, preferably at each corner, so that the respective bosses at corresponding, common corners of the upper and lower covers, when assembled, are in an aligned and abutting relationship. A slits is formed in one of the corners of the upper and lower covers, extending around the respective boss(es) thereof, making up a strap mounting space. A screw  9  is inserted into a corresponding axial hole extending through each boss, affording a sufficient strength of the abutting bosses for supporting the case, with the apparatus therein, by a strap received through the strap mounting space.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims priority from Japanese Patent Application No. 10-357690, filed Dec. 16, 1998, the contents being incorporated herein by reference, and a continuation of PCT/JP99/03326 filed on Jun. 22, 1999. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention relates to a carrying strap attaching structure in a portable type electronic apparatus. The present invention also relates to an electronic apparatus to which a strap can be attached. 
     A case of a portable type electronic apparatus, such as a portable telephone, a portable personal computer, a hand-held terminal (hereinafter referred to as HHT) or a video camera, is generally provided with a strap for securing the case in a closed condition and for protection against dropping. For this purpose, each such portable type electronic apparatus has a structure for mounting a strap. 
     There are several kinds of straps, such as a neck strap to hang the apparatus from a user&#39;s neck or a wrist strap through which a user&#39;s wrist is passed and from which the apparatus hangs. 
     BACKGROUND ART 
     A conventional method/apparatus, for attaching a strap to a portable type electronic apparatus (hereinafter referred to as a body), is shown in FIGS. 13 and 14, in which a strap fitting metal member is arranged in the housing of the electronic apparatus. In FIGS. 13 and 14, a metal member  20  is fixed to a lower cover  4  by a screw  21 . FIG. 14 is a sectional view, taken on line XIV—XIV of FIG. 13, specifically showing a corner portion of the housing. 
     The upper cover  3  and the lower cover  4  making up the housing are fitted to each other with screws  22 . Also, an upper damper  5  and a lower damper  6  are mounted at the corner portion of the upper cover  3  and the lower cover  4 , respectively. These dampers  5  and  6  have the function of absorbing shocks applied to the electronic apparatus. 
     In the example shown in FIGS. 13 and 14, the metal member  20  is formed with a rectangular hole  20 ′ in an L-shaped bottom portion thereof. A strap is attached to the electronic apparatus by inserting a tape portion of the strap into the hole  20 ′. 
     The method using the metal member  20  as shown in FIGS. 13 and 14, however, is costly due to the need for the metal member  20 . Also, all portable type electronic apparatuses are desirably as small as possible. In the method/apparatus shown in FIGS. 13 and 14, however, a space for mounting the metal member  20  is required, which is a stumbling block to achieving a decreased size of the apparatus, on the one hand, and limits the position for mounting the metal member  20 , on the other hand, thereby posing the problem that the strap cannot necessarily be mounted at a convenient position. 
     In another conventional method/apparatus, as shown in FIG. 15, a screw-receiving metal member  23  is arranged in a housing, of upper and lower cases  3  and  4 , respectively, and the tape portion  25  of the strap is mounted to another metal member  24 , which is inserted and threaded into the threaded hole of the screw-receiving metal member  23 , to thus mount the strap  25  to the housing. Still another conventional method/apparatus is known in which, as shown in FIG. 16, a post  26  for binding the strap is integrally formed with the upper case  3  as disclosed in Japanese Unexamined Patent Publication No. 9-55587. 
     In the conventional method shown in FIG. 15, threaded members  23  and  24  are required on the housing and the strap  25 , respectively, resulting in increased cost and, because the screw-receiving metal member  23  is arranged horizontally in the side of the upper cover  3 , a slide mechanism is required in the die for molding the upper cover  3 , thereby leading to the disadvantage that the die is complicated. 
     Also, in the conventional method/apparatus shown in FIG. 16, the circular post  26  extends between the upper and lower walls of the upper cover  3 , so a slide mechanism is required in the die for molding the upper cover  3 , as in the conventional method/apparatus shown in FIG. 15, thereby similarly leading to the disadvantage that the die is complicated. 
     As described above, the conventional methods pose the problems that the cost of the portable type electronic apparatus is increased, the strap mounting position is limited and the die is complicated, introducing an increased cost. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to solve the above-mentioned problems and to provide a strap attaching structure for an electronic apparatus intended to reduce the apparatus size without increasing the cost. 
     According to the present invention, the housing of the electronic equipment is divided into an upper cover and a lower cover, both covers being fixed at a boss formed on at least one of the covers. The upper cover or the lower cover is molded integrally with the boss such that a space for mounting the strap is formed around the boss when the upper cover and the lower cover are assembled together. 
     With the structure according to the present invention, unlike the conventional methods/apparatuses, the space or the post for mounting the strap is formed with the upper and lower cover assembled. As a result, the die for producing the upper cover or the lower cover is not required to have a slide mechanism and therefore a die for fabricating same is not complicated. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Embodiments of the present invention will be described in more detail, below, with reference to the accompanying drawings, in which: 
     FIG. 1 is a perspective view showing an electronic equipment according to a first embodiment of the present invention; 
     FIG. 2 is a perspective view as taken along arrow II in FIG. 1; 
     FIG. 3 is a sectional view taken in line III—III in FIG. 2; 
     FIG. 4 is a perspective view showing a portion of the lower cover; 
     FIG. 5 is a bottom view of the upper damper; 
     FIG. 6 is a perspective view showing a second embodiment of the present invention; 
     FIG. 7 is a perspective view showing a third embodiment of the present invention; 
     FIG. 8 is an exploded perspective view showing a fourth embodiment of the present invention; 
     FIG. 9 is a view taken along arrow IX in FIG. 8; 
     FIG. 10 is a perspective view showing an example of the upper cover; 
     FIG. 11 is a perspective view showing an example of the lower cover; 
     FIG. 12 is a partial view showing the upper cover of FIG.  10  and the lower cover of FIG. 11 assembled to each other; 
     FIG. 13 is a view for explaining a first conventional structure; 
     FIG. 14 is a sectional view taken in line XIV—XIV in FIG. 13; 
     FIG. 15 is a view for explaining a second conventional structure; and 
     FIG. 16 is a view for explaining a third conventional structure. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Now, embodiments of the present invention will be explained with reference to the drawings. 
     FIGS. 1,  2  and  3  are views showing portable electronic equipment according to a first embodiment of the invention, and especially illustrate an apparatus called a hand-held terminal. 
     FIG. 1 shows an outer appearance of a hand-held terminal  1  (hereinafter referred to as an HHT) to which a neck strap  2  is attached. The HHT  1  shown in FIG. 1 includes a screen  15  formed with a touch panel on the front surface thereof. Also, a keyboard  16 , including input keys such as numerical keys and function keys, is arranged on an edge of the screen  15 . The HHT  1  is carried by a user to a work-place and used there to input information while holding it in his/her hand. For this purpose, a hand strap or the neck strap  2  can be attached to the HHT  1 . The user uses the HHT  1  by hanging the neck strap from his neck, for example, to improve operability and reduce fatigue after a long period of use. Also, the strap can prevent the HHT  1  from dropping. 
     FIG. 1 shows an example in which respective strap attaching structures  17  are arranged at four corners of the terminal  1  and the neck strap  2  is attached to the respective structures  17  at the upper two corners of the HHT. Arbitrary ones of the four strap attaching mechanisms  17  can be used by the user as desired. For example, the two strap attaching mechanisms  17  located at the diagonal corners can be used. 
     Also, the HHT  1  according to this embodiment includes damper members  5  and  6  at the four corners for protection against dropping. 
     In FIGS. 1 to  3 , numeral  1  designates a hand-held terminal, numeral  2  a neck strap, numeral  3  an upper cover, numeral  4  a lower cover, numeral  5  an upper damper, numeral  6  a lower damper, and numeral  7  a strap mounting space. 
     FIG. 2 is a view taken along arrow II in FIG. 1, showing the tape  12  of the strap  2  mounted in a slit  18  formed in the sides of the upper damper  5  and the lower damper  6 . Further, a sectional view taken on line III—III of FIG. 2 is shown in FIG.  3 . 
     In FIG. 3, the upper cover  3  and the lower cover  4  are formed of plastic, and bosses  8  are integrally formed with respective covers  3  and  4  so that the covers  3  and  4  can be fixed by a screw  9 . The upper cover  3  and the lower cover  4  have outer walls  3   a  and  4   a  and inner walls  3   b  and  4   b , respectively. The inner walls  3   b  and  4   b  can be joined with each other in opposed relation to each other. As a result, the upper cover  3  and the lower cover  4  make up a case of the HHT  1 . A space  7 , provided around the boss  8 , can be utilized for mounting the strap. 
     As shown in FIG. 3, the upper cover  3  and the lower cover  4  have bosses  8  formed therewith for fitting the two covers to each other. With the HHT  1  according to this embodiment, a slit-like strap mounting space  7  is formed around the bosses when arranged in abutment against each other. 
     FIG. 4 shows a portion of the lower cover  4 . The lower cover  4  has the boss  8  and the slit  7   a . In similar fashion, the upper cover  3  has a boss  8  and a slit  7   a  (refer to FIG.  4 ). In the case where the inner wall  3   b  of the upper cover  3  and the inner wall  4   b  of the lower cover  4  are joined with each other, the boss  8  of the upper cover  3  and the boss  8  of the lower cover  4  come into abutment against each other on a straight line. Each boss  8  has a through hole. The slit  7   a  of the upper cover  3  and the slit  7   a  of the lower cover  4  form the space  7 . Each boss  8  has a free end and each slit  7   a  is open, so the die can be released easily when the upper cover  3  and the lower cover  4  are molded integrally with the respective bosses  8 . Each slit  7   a  is formed only in a range, corresponding to a quarter of a circle, around the boss  8 . 
     The upper damper  5  and the lower damper  6 , which are formed of an elastomer having the properties of both plastic and rubber for protection against dropping, are fixed integrally to the upper cover  3  and the lower cover  4  using the screw  9 . The dampers  5  and  6  have some elasticity and can absorb shock which may be exerted on the HHT  1  when dropped. In FIG. 3, each damper is formed of two materials. Specifically, the portions designated by  5 - 1  and  6 - 1  are formed of elastomer, while the portions designated by  5 - 2  and  6 - 2  are formed of plastic. In the example of FIG. 3, the plastic  5 - 2  and  6 - 2  and the elastomer  5 - 1  and  6 - 1  are overlaid one on the other in such a manner as to be located inside and outside, respectively. In other words, the plastic  5 - 2  and  6 - 2  and the elastomer  5 - 1  and  6 - 1  make up the upper damper  5  and the lower damper  6  integrally structured by two-color molding. As described above, these dampers  5  and  6  are mounted at the four corners of the HHT  1 . 
     The dampers  5  and  6  are each formed with a slit  18  open to the portion of the upper cover  3  and the lower cover  4  corresponding to the position of the strap mounting space  7  (shown in FIG.  2 ). By inserting the tape  12  of the strap into the slit  18 , it is possible to insert the tape  12  of the strap into the strap mounting space  7 . FIG. 5 is a bottom view of the upper damper  5 . The upper damper  5  has an insert-molded metal member  19  having a threaded hole. The screw  9  is threaded into the metal member  19  via the through holes of the two bosses  8 . Thus, the covers  3  and  4  and the dampers  5  and  6  can be fixed with a common screw  9  thereby to form the space  7  around the bosses  8 . 
     An explanation will be given of the advantage obtained by the use of bosses  8  for mounting the strap, which bosses  8  are arranged for fitting the upper cover  3  and the lower cover  4  to each other. Generally, the upper cover  3  and the lower cover  4  are formed of a comparatively tough resin. In the case where the strap  2  is mounted, however, the portion where the strap  2  is mounted is concentratedly subjected to a load to such an extent that the strap mounting structure  17  is sometimes broken. 
     According to this embodiment, however, the strap  2  is mounted around the bosses  8 . The screw  9  for joining the covers with each other is inserted into the bosses  8 . The screw  9  is made of a metal and has a considerably higher strength than resin. As a result, the screw  9  inserted into the bosses  8  performs a function of a reinforcing member for the bosses  8 , and the strength required to mount the strap  2  can be secured. Thus, even if the strap  2  is pulled strongly, the strap mounting mechanism (bosses) can be prevented from breaking. 
     FIGS. 1 to  3  show an example in which the slit  7   a  constituting the strap mounting space  7  is formed in both the upper cover  3  and the lower cover  4 . Nevertheless, the slit  7   a  can be formed in one of the upper cover  3  and the lower cover  4 . In that case, an opening is formed in the portion of the strap mounting space  7  in contact with the other cover to facilitate the sliding of the die at the time of integral molding. 
     FIG. 6 is a view showing a second embodiment of the invention and represents a case in which the strap mounting mechanism is configured of the bosses  8  alone. In the example of FIG. 6, a slit  18  is not formed in the upper damper  5  and the lower damper  6 , but the upper cover  3  and the lower cover  4  are so configured as to expose the bosses  8  formed on the covers. An effect similar to that of the first embodiment can be achieved by arranging the strap tape around or binding the string at the forward end of the strap to the circular post formed by the bosses  8 . 
     FIG. 7 is a diagram showing a third embodiment of the invention. This embodiment shows a case in which a slit  10  is formed in the wall surface portion of the upper cover  3  and the lower cover  4 , and the strap mounting mechanism is configured of the slit  10 . In the example of this embodiment, the strap tape is inserted through the space formed by the slit  10 . According to the third embodiment, unlike in the first embodiment, the member equivalent to the upper damper or the lower damper is not mounted at the corners of the HHT. 
     FIGS. 8 and 9 are views showing a fourth embodiment of the invention, in which the forward end of the tape of the strap  2  is prevented from being caught in the gap of the strap mounting space  7  in the first or third embodiment. FIG. 8 is a perspective view and FIG. 9 a view taken along arrow IX of FIG.  8 . 
     In the case of the first embodiment, as shown in FIG. 3, a gap is formed between the bosses  8  and the upper damper  3  or the lower damper  4 . For mounting the strap  2  to the HHT  1 , the tape portion of the strap is required to be inserted into the strap-mounting slit portion, but in this process, the forward end of the tape portion is liable to be caught or involved in the gap between the bosses  8  and the upper damper  3  or the lower damper  4 , with the result that the workability of the strap mounting job is deteriorated to such an extent that the tape portion  12  of the strap fails to be inserted. This is also the case with the third embodiment. In the second embodiment, the bosses  8  are exposed, and therefore the tape portion is not caught. A similar inconvenience occurs, however, in the case where the damper or the like is mounted for shock protection but a gap develops between the bosses and the dampers. 
     On the other hand, as shown in FIG. 9, according to this embodiment, ribs  11  are formed in the gap between the bosses  8  and the strap mounting space  7 . The ribs  11  extend to or near the wall surface of the cover. Therefore, the tape of the strap can be guided by the ribs  11 , and is not caught in the internal space. In other words, according to this embodiment, the tape inserted in the strap mounting space is less liable to be caught in the gap between the bosses  8  and the damper or the cover wall surface than in other embodiments. Consequently, the workability of the strap mounting job can be improved. 
     FIGS. 10 and 11 are views showing an example of the upper cover  3  and the lower cover  4 , respectively. 
     When the upper cover  3  of FIG.  10  and the lower cover  4  of FIG. 11 are assembled together as shown in FIG. 12, the strap mounting structures  17  are formed at the four corners. Three strap mounting structures  17  include the bosses  8  and the strap mounting spaces  7 , as explained heretofore. The remaining strap mounting structure  17  does not include the boss  8  and, instead, the space  7   b  is formed around the metal member  19  of the upper damper  5 . 
     As explained above, according to the present invention, the attachment of the strap is established, utilizing the mounting boss for mounting the upper and lower covers. As a result, a special part for mounting the strap is not required, so that the apparatus cost and the apparatus size can be reduced correspondingly. 
     Also, the mounting boss is used for attaching the strap, and the screw passes through the boss, so the boss is substantially reinforced by the screw. Thus, there is an effect that a sufficient strength can be secured even when the strap is pulled. 
     Further, in the case where a strap mounting space is formed in the cover, an opening is formed in the surface of the cover fitted with the other cover eliminates the need of a slide mechanism in the die structure for the cover production and simplifies the equipment production process. In addition, the cover molding cost can be reduced.