Abstract:
The micro SIM card socket of the Present Disclosure, by manufacturing the contact terminals in a “U” shape, can resolve the problem of narrowing contact terminal installation space due to miniaturization trends, and also the problem of collision between the card front end and the contact terminals when a card is inserted; it can effectively prevent the malfunction or poor contact that can occur due to the inability of the contact terminals to firmly contact the connection terminals of the SIM card when the SIM card is inserted.

Description:
REFERENCE TO RELATED APPLICATIONS 
     The Present Disclosure is a United States National Phase Application of PCT Patent Application No. PCT/KR2011/0006526, entitled “Micro SIM Card Socket,” filed on 2 Sep. 2011 with the Korean Intellectual Property Office (KIPO). Further, the Present Disclosure claims priority to prior-filed Korean Patent Application No. 10-2010-0085856, entitled “Micro SIM Card Socket,” filed on 2 Sep. 2010 also with the KIPO. The content of the aforementioned Patent Application is incorporated in its entirety herein. 
     BACKGROUND OF THE PRESENT DISCLOSURE 
     The Present Disclosure relates, generally, to a micro SIM card socket, and more specifically to a micro SIM card socket with improved contact terminal shape, thus enabling microminiaturized and ultraslim configurations. 
     In general, a Subscriber Identification Module (SIM) is a chip on which the diverse personal information of the subscriber is stored, such as a telephone number. If this chip is connected to a Code Division Multiple Access (CDMA) terminal for international roaming, then regardless of the technical specification of the mobile phone, e.g., CDMA or GSM, it enables mobile telephony to be used freely in any region, with the subscriber&#39;s own telephone number. To obtain international roaming service using a SIM card, the SIM card is inserted directly into the socket (connector) onboard the terminal (mobile phone) for use. 
     A conventional micro SIM card socket is furnished with an insulative housing wherein the SIM card is mounted. A metal shell guides the insertion of the SIM card by coupling with the housing while maintaining a fixed interval therefrom. A plurality of contact terminals are supported on the housing and contact the connection terminals of the SIM card on one side and are fixed to a printed circuit board on the other side. A SIM card recognition terminal is supported on the housing in order to recognize the insertion of the SIM card. A locking part is installed on the side of the housing to selectively fix the insertion location of the SIM card. 
     However, in conventional micro SIM card sockets, with the miniaturization of apparatus including terminals, the SIM cards mounted within the apparatus is also being miniaturized, and consequently the sockets are also being miniaturized, so that the space in which the contact terminals can be safely installed within the housing is becoming very narrow. Additionally, there is a risk of collision between the front end of the card and the contact terminals during insertion. Also, due to the inadequate escape zone, there are limits to the extent to which an ultraslim configuration can be achieved. 
     Considering the problem of collision with the contact terminals at the time of micro SIM card insertion, referring to  FIGS. 1-3 , first, as shown in  FIG. 1 , there is a risk of collision between the front end of the micro SIM card  1  and the contact terminal  12 , and as shown in  FIG. 2 , collision with the front end of the micro SIM card  1  must be prevented by slightly lengthening the front end of the contact terminal  12 . However, as shown in  FIG. 3 , after contact with the micro SIM card  1 , there is the problem of the edge of the contact terminal  12  colliding with the bottom of the printed circuit board. 
     Further, considering the problem of narrowing memory card socket space at memory card insertion, as shown in  FIG. 4 , the contact terminal  12  must have at least a minimum length in order for the contact terminal  12  to have elasticity, and if a slope is formed on the contact terminal  12  in the direction of card insertion, the collision problem can be resolved. However, because the minimum length, L, of the contact terminal  12  goes outside of the exterior of the housing  11 , it is not feasible to mount the contact terminal  12  within the housing  11  due to the inadequate space within the housing  11 , and since the exterior lines of the printed circuit board and the housing  11  do not match, it is also difficult to form a solder pattern, so that in practice it has not been possible to configure this structure for a SIM card. 
     SUMMARY OF THE PRESENT DISCLOSURE 
     The Present Disclosure is intended to solve the above-described problems. Accordingly, the Present Disclosure has, as one objective, the provision of a micro SIM card socket that, by being manufactured in a “U” shape, resolves both the problem of narrowing installation space due to miniaturization and the problem of collision between the micro SIM card and the contact terminals, and that can ensure sufficient contact force to maintain consistent contact, while also contacting the contact terminal firmly to the micro SIM card connection terminal when the micro SIM card is inserted, even in an ultraslim configuration. 
     To achieve the above-described objective, the micro SIM card socket of the Present Disclosure comprises: an insulative housing wherein the SIM card is mounted; a metal shell that guides the insertion of the SIM card by coupling with the housing while maintaining a fixed interval from the housing; a plurality of contact terminals that are supported on the housing and contact the connection terminals of the SIM card on one side and are fixed to a printed circuit board on the other side; a SIM card recognition terminal supported on the housing in order to recognize the insertion of the SIM card; and a locking part installed on the side of the housing so as to selectively fix the insertion location of the SIM card. The contact terminal has a “U” shape and the terminal on one side of the contact terminal has a tensioned sloping part elastically pressed against the SIM card end when the SIM card is inserted, and on the end of the tensioned sloping part is formed a contact part that is contacted to the connection terminal of the SIM card. 
     When inserting the SIM card, if the tensioned sloping part is pressed by the end of the SIM card, the contact terminal is elastically supported on the printed circuit board and also generates a secondary moment, so that the contact part firmly contacts the connection terminal of the SIM card. The tensioned sloping part should preferably be bent at a 30-45° upwards angle from front to back of the housing. The “U”-shaped contact terminal is furnished with a horizontal part that couples to the housing, and a fixing part that fixes to the printed circuit board and is formed bending downward onto one end of the horizontal part. The tensioned sloping part is formed at the other end of the horizontal part, bending upward from front to back of the housing. 
     As described hereinabove, by manufacturing the contact terminals in a “U” shape, the Present Disclosure resolves both the problem of narrowing installation space due to miniaturization and the problem of collision between the micro SIM card and the contact terminals, and can ensure consistent connectivity between the contact terminals and the SIM card, even in an ultraslim configuration. 
    
    
     
       BRIEF DESCRIPTION OF THE FIGURES 
       The organization and manner of the structure and operation of the Present Disclosure, together with further objects and advantages thereof, may best be understood by reference to the following Detailed Description, taken in connection with the accompanying Figures, wherein like reference numerals identify like elements, and in which: 
         FIGS. 1-3  each illustrate the collision with the contact terminal when inserting a micro SIM card; 
         FIG. 4  illustrates the narrow space within the housing of the micro SIM card; 
         FIG. 5  is an exploded oblique view of a micro SIM card socket of the Present Disclosure; 
         FIG. 6  is an assembled oblique view of the micro SIM card socket of  FIG. 5 ; 
         FIG. 7  is a top view of the micro SIM card socket of  FIG. 5 ; 
         FIG. 8  is a bottom view of the micro SIM card socket of  FIG. 5 ; 
         FIG. 9  is an oblique view showing contact terminals according to the Present Disclosure; 
         FIG. 10  is a top view of the heart cam; and 
         FIG. 11  illustrates the contact force and plastic deformation at maximum and minimum contact of the contact terminals according to the Present Disclosure. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     While the Present Disclosure may be susceptible to embodiment in different forms, there is shown in the Figures, and will be described herein in detail, specific embodiments, with the understanding that the Present Disclosure is to be considered an exemplification of the principles of the Present Disclosure, and is not intended to limit the Present Disclosure to that as illustrated. 
     As such, references to a feature or aspect are intended to describe a feature or aspect of an example of the Present Disclosure, not to imply that every embodiment thereof must have the described feature or aspect. Furthermore, it should be noted that the description illustrates a number of features. While certain features have been combined together to illustrate potential system designs, those features may also be used in other combinations not expressly disclosed. Thus, the depicted combinations are not intended to be limiting, unless otherwise noted. 
     In the embodiments illustrated in the Figures, representations of directions such as up, down, left, right, front and rear, used for explaining the structure and movement of the various elements of the Present Disclosure, are not absolute, but relative. These representations are appropriate when the elements are in the position shown in the Figures. If the description of the position of the elements changes, however, these representations are to be changed accordingly. 
     Referring to  FIGS. 5-10 , the micro SIM card socket  100  of the Present Disclosure is furnished with: an insulative housing  110  whereto the micro SIM card  1  is mounted; a metal shell  120  that guides the insertion of the micro SIM card  1  by coupling with the housing  110  while maintaining a fixed interval from the housing  110 ; a plurality of contact terminals  130  supported on the housing  110 , and that contact the connection terminals  1   a  of the micro SIM card  1  on one side and are fixed to a printed circuit board (not shown) on the other side; a micro SIM card recognition terminal  140  supported on the housing  110  in order to recognize the insertion of the micro SIM card  1 ; and a locking part  150  installed on the side of the housing  110  to selectively fix the insertion location of the micro SIM card  1 . 
     The housing  110  comprises an insulator, such as a conventional plastic. On the bottom surface, a plurality of grooves  111  are formed to prevent interference with the connection terminals  1   a  in the event of elastic deformation of the connection terminals  1   a . The metal shell  120  guides the insertion of the micro SIM card  1  and is formed of a conventional metal material. The contact terminal  130  is intended to connect electrically with the micro SIM card  1  and printed circuit board  8 . Contact terminals  130  are positioned in sequence, and 4 tensioned sloping parts  133 , described below, are deployed to the front and back. 
     With regard to the shape of the contact terminals  130 , the contact terminals  130  have a rough “U” shape. Somewhat more specifically, the contact terminals  130  respectively comprise: a horizontal part  131  coupled to the housing  110 ; a fixed part (weld part)  132  fixed to the printed circuit board and is formed bending downward on one side of the horizontal part  131 ; a tensioned sloping part  133  formed bending upward from the front to the rear of the housing  110 , on the other side of the horizontal part  131 ; and a contact part  134  formed extending from the tensioned sloping part  133 . 
     The tensioned sloping parts  133  are pressed elastically to the rear end of the micro SIM card  1  when the micro SIM card  1  is inserted. The contact part  134  is contacted elastically to the connection terminal  1   a  of the micro SIM card  1 . 
     When the micro SIM card  1  is inserted, if the tensioned sloping part  133  is pressed by the rear end of the micro SIM card  1 , a secondary moment is generated while the horizontal part  131  of the contact terminal  130  is supported elastically on the printed circuit board. In this case, the contact part  134  of the contact terminal  130  is configured to as to contact firmly to the connection terminal  1   a  of the micro SIM card  1 . Here, it is preferable that the tensioned sloping part  133  be bent 30-45° from the front to the rear of the housing  110 . 
     The locking unit  150  comprises: a heart cam  151  having a heart-shaped guide groove  151   a  and installed to enable sliding motion together with the SIM card  1  along the guide groove  151   a  within the side of the housing  110 ; a pin rod  153  that fixes the position of the micro SIM card  1  while moving along the guide groove  151   a ; and a spring  155  that elastically supports the heart cam  151 . 
     As shown in  FIG. 10 , the end of the pin rod  153  is inserted into the heart-shaped guide groove  151   a , and when the heart cam  151  is moved by the motion of the micro SIM card  1 , the end of the pin rod  153  is cycled through positions A→B→C→D→E→F→G→H→A of the guide groove  151   a , moving the micro SIM card  1  from the separation position (unlocking) to the insertion position (locking) and back to the separation position (unlocking). 
     In operation, the micro SIM card  1  is inserted into the insulative housing  110  by pressure. The metal shell  120  then acts to guide the insertion of the micro SIM card  1 . The heart cam  151  then is supported elastically on the spring  155 , and the end of the pin rod  153  moves through positions A→B→C→D→E of the guide groove  151   a , moving the micro SIM card  1  from separation position to insertion position. 
     When the micro SIM card  1  is then inserted, if the tensioned sloping part  133  is pressed by the rear end of the micro SIM card  1 , a secondary moment is generated while the horizontal part  131  of the contact terminal  130  is supported elastically on the printed circuit board. The contact part  134  of the contact terminal  130  is firmly contacted to the connection terminal  1   a  of the micro SIM card  1 . If the micro SIM card  1  is pressed once more, the end of the pin rod  153  is moved through positions E→F→G→H→A of the guide groove  151   a , so that the micro SIM card  1  is returned to the separation position. 
     As shown in  FIG. 11 , at maximum contact of the contact terminal  130  according to the Present Disclosure, the contact force was measured at 0.62 N/Pin, and the plastic deformation at 0.035 mm. At minimum contact of the contact terminal  130  according to the Present Disclosure, the contact force was measured at 0.38 N/Pin, and the plastic deformation at 0.0023 mm. The contact terminal  130  according to the Present Disclosure generates a secondary moment while being elastically supported on the printed circuit board, thus enabling the contact part  134  of the contact terminal  130  to be firmly contacted to the connection terminal  1   a  of the micro SIM card  1 , enabling both microminiaturized and ultraslim configurations. 
     As described above, by being produced in a “U” shape, the Present Disclosure resolves both the problem of narrowing installation space due to miniaturization and the problem of collision between the front end of the card and the contact terminals, and can ensure consistent connectivity between the contact terminals and the micro SIM card when the micro SIM card has been inserted, even in an ultraslim configuration. 
     While a preferred embodiment of the Present Disclosure is shown and described, it is envisioned that those skilled in the art may devise various modifications without departing from the spirit and scope of the foregoing Description and the appended Claims.