Abstract:
In a connector for electrically connecting a mating object, a cover  12  is used for pressing the mating object against a contact 16 held by a housing  11 . The cover is held on the housing  11  to be rotatable in a first direction and to be movable in a second direction intersecting the first direction. The cover is kept in a connected state by locking portions  14  and  21  which are engaged with each other in a direction opposite to the first direction and in the second direction. Upon disconnection of the mating object, the cover is rotated in the first direction to release the engagement of the locking portions and is moved in the second direction, thereby allowing the mating object to be disconnected.

Description:
This invention claims priority to prior Japanese patent application JP 2002-269675, the disclosure of which is incorporated herein by reference.  
       BACKGROUND OF THE INVENTION  
         [0001]    The present invention relates to a connector for use in connecting a small-sized thin-profile card, such as an IC card.  
           [0002]    Recently, an IC card is remarkably wide spread. Even a small-sized apparatus, such as a mobile telephone, which can always be carried by a user is provided with a connector for connecting the IC card. The connector of the type is required to have a thin profile and to have a function of protecting the IC card.  
           [0003]    In order to meet the above-mentioned requirement, proposal is made of a connector comprising a housing fixedly holding a contact, and an openable/closable cover for pressing a mating object to be connected against the contact to establish electrical connection. In the above-mentioned connector, the IC card is inserted and removed while the cover is opened. After completion of insertion or removal of the IC card, the cover is closed and a part of the cover is engaged with the housing to be locked.  
           [0004]    As the connector of the type, there is known a connector which essentially requires the cover to be moved, sliding along the housing in order to unlock the cover (see Japanese Unexamined Patent Publications Nos. H10-106674, H11-167968, and 2000-260537). In the connector of this type, the cover is not unlocked unless the cover is slid along the housing. Therefore, during normal use, it is unlikely that the cover is unintentionally and erroneously opened.  
           [0005]    In particular, the connector disclosed in Japanese Unexamined Patent Publication No. H10-106674 has a metallic cover in order to achieve a thin profile. In order to hold the cover to be rotatable and slidable with respect to the housing, a long slot formed in the cover is engaged with a shaft portion formed on the housing.  
           [0006]    The connector disclosed in Japanese Unexamined Patent Publication No. 2000-260537 also has a metallic cover in order to achieve a thin profile, like the connector disclosed in Japanese Unexamined Patent Publication No. H10-106674.  
           [0007]    However, in each of the connectors disclosed in Japanese Unexamined Patent Publications Nos. H10-106674, H11-167968, and 2000-260537, the cover may slide along the housing to be unlocked and opened if the connector is subjected to strong mechanical shock, for example, when an apparatus equipped with the connector is dropped. In case where the cover is unintentionally and undesiredly opened, it is highly possible to cause instantaneous interruption or permanent interruption of a signal. The above-mentioned problem is difficult to solve merely by weak frictional engagement between the cover and the housing. On the contrary, if the frictional engagement is strong, it is difficult to perform an operation of opening the cover.  
           [0008]    If the cover is provided with the long slot, the cover may be displaced from a proper position during rotation. In this event, one end of the cover may be butted against a substrate with the connector mounted thereto, thereby preventing smooth rotation of the cover. In order to avoid the above-mentioned problem, Japanese Unexamined Patent Publication No. H10-106674 adopts a structure in which the cover is allowed to rotate after an axis moves from its initial position to a rotatable position. In this structure, however, a thin profile can not be achieved because of protrusion of one end of the cover during rotation. In order to prevent the displacement of the axis during rotation, the long slot is divided into a circular part (rotating portion) and a rectangular part (sliding portion) in the above-mentioned publication. However, since the shaft portion is integrally formed with the housing made of resin susceptible to wear, the effect of such a two-part shape does not continue for a long time because of wear of the shaft portion.  
           [0009]    According to Japanese Unexamined Patent Publication No. 2000-260537, the above-mentioned disadvantages of Japanese Unexamined Patent Publication No. H10-106674 are removed except the strength of the shaft portion. However, the shaft portion of the metallic cover is formed by an additional or separate piece. This results in an increase in number of parts. Therefore, even if the thin profile can be achieved, the cost will be increased. In case where the shaft made of resin is fixed to the metallic cover, the problem of wear is inevitable. Even if the shaft is configured into a special shape in order to control the operation of the cover, the effect of such a special shape does not continue for a long time, like in Japanese Unexamined Patent Publication No. H10-106674.  
         SUMMARY OF THE INVENTION  
         [0010]    It is therefore an object of the present invention to provide a connector adapted for use in connecting a small-sized thin-profile card, which has a cover can be readily operated and reliably locked in a closed state thereof.  
           [0011]    It is another object of the present invention to economically provide a connector which can easily be reduced in profile.  
           [0012]    Other objects of the present invention will become clear as the description proceeds.  
           [0013]    According to an aspect of this invention, there is provided a connector for electrically connecting a mating object. The connector comprises a conductive contact, a housing fixedly holding the contact, a cover connected to the housing for pressing the mating object against the contact to establish electrical connection between the mating object and the contact, and a locking portion connected to the housing and the cover for keeping the cover in a connected state in which the electrical connection is established. The cover is held on the housing to be rotatable in a first direction and to be movable in a second direction intersecting the first direction. The locking portion is engaged in a direction opposite to the first direction and in the second direction. Disconnection of the mating object being carried out by rotating the cover in the first direction to disengage the locking portion and by moving the cover in the second direction, thereby allowing the mating object to be disconnected. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWING  
       [0014]    [0014]FIG. 1 is a perspective view of a connector according to an embodiment of this invention when a cover is opened;  
         [0015]    [0015]FIG. 2 is a perspective view of the connector in FIG. 1 when the cover is closed;  
         [0016]    [0016]FIG. 3 is a bottom view of the connector illustrated in FIG. 2;  
         [0017]    [0017]FIG. 4 is a perspective view of the connector illustrated in FIGS. 1 through 3 when the cover is opened and an IC cover is inserted into the connector;  
         [0018]    [0018]FIGS. 5A to  5 D are a plan view, a front view, a right side view, and an enlarged perspective view of the connector in FIGS. 1 through 3 when the cover is closed;  
         [0019]    [0019]FIGS. 6A and 6B are a front view and an enlarged perspective view of the connector in FIGS. 1 through 3 for describing a first step of operation of opening the cover;  
         [0020]    [0020]FIGS. 7A and 7B are a front view and an enlarged perspective view of the connector in FIGS. 1 through 3 for describing a second step of operation of opening the cover;  
         [0021]    [0021]FIG. 8 is a front view of the connector in FIGS. 1 through 3 for describing a third step of operation of opening the cover;  
         [0022]    [0022]FIG. 9 is a front view of the connector in FIGS. 1 through 3 for describing a fourth step of operation of opening the cover;  
         [0023]    [0023]FIG. 10A is an enlarged perspective view of a modification of the connector in FIGS. 1 through 3 when the cover is closed; and  
         [0024]    [0024]FIG. 10B is an enlarged perspective view of the modification in FIG. 10A when the cover is opened. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0025]    Referring to FIGS. 1 through 3, description will be made of a connector according to an embodiment of this invention.  
         [0026]    The connector  10  illustrated in the figures serves to connect a so-called IC card as a small-sized thin-profile card to a small-sized apparatus, such as a mobile telephone, which can always be carried by a user. The connector  10  comprises a housing  11  made of an insulating material, and a metallic cover  12  made of a metal and coupled to the housing  11  so as to open and close an upper surface of the housing  11 .  
         [0027]    The cover  12  has a first and a second end portion opposite to each other and is provided with a pair of cover shaft portions  13  which are integrally formed on both sides of the first end portion and extends inward towards each other. The cover shaft portions  13  are coupled to one end  11   a  of the housing  11 .  
         [0028]    The cover shaft portions  13  are rotatable with respect to the housing  11  to make the cover  12  be closable in a first direction. Furthermore, the cover shaft portions  13  are movable along the housing  11  in a second direction Y. A pair of cover locking portions  14  is formed at the second end portion, i.e., a rotating end of the cover  12 . The cover locking portions  14  are of a fingerlike shape bent outward. If the cover  12  is rotated from its a closed position at which the cover  12  is overlapped on the housing  11 , the rotating end of the cover  12  is moved substantially in a direction Z, i.e., in a vertical direction.  
         [0029]    The housing  11  has a housing thin portion  15 . The housing thin portion  15  holds a plurality of conductive signal contacts  16 . Each signal contact  16  has a contact-side contacting portion  16   a  having elasticity and protruding on an upper surface of a center area of the housing thin portion  15 , and a contact soldering portion  16   b  located in an opening  17  near the other end  11   b  of the housing  11  and integrally formed with the contact-side contacting portion  16   a . A reference numeral  18  represents a hold-down.  
         [0030]    On at least one side of the housing thin portion  15 , a cover holding spring  19  is held. The cover holding spring  19  serves as an elastic member for continuously urging the cover  12  in an opening direction.  
         [0031]    The housing  11  is provided with a pair of housing locking portions  21  formed on both sides thereof near the other end  11   b . The housing locking portions  21  serve as a cover holding portion for holding the cover  12 . The housing locking portions  21  are made as parts of metallic locking plates  22 , respectively, which are made of a metal and fixed to the housing  11 . Other parts of the locking plates  22  are located in the opening portion  17  as plate soldering portions  22   a  each of which is for connecting the ground.  
         [0032]    Particularly referring to FIG. 3, the housing  11  has a pair of housing protrusions  23  formed on both sides of the one end  11   a  and adapted to face the cover shaft portions  13  in a third direction X. The housing protrusions  23  serve as an obstacle to the movement of the cover shaft portions  13  in the direction Y. However, if the cover. 12  is strongly pressed in the direction Y, the cover shaft portions  13  move over the housing protrusions  23  and the cover  12  is elastically deformed. As a result, the cover  12  is allowed to move in the direction Y. When the cover shaft portions  13  move over the housing protrusions  23 , the housing protrusion and the shaft portion slide to each other to produce resistance force relative to movement of the shaft portion in the second direction. In other words, the cover shaft portions  13  and the housing protrusions  23  cooperate with each other to serve as a frictional locking arrangement for flexibly locking the cover  12  to the housing  11  in the direction Y by frictional engagement.  
         [0033]    Referring to FIG. 4 in addition, description will be made of an operation of connecting an IC card  30  as a mating object to the connector  10 .  
         [0034]    In FIG. 4, the IC card  30  has a plurality of card-side contacting portions  31  in one-to-one correspondence to the contact-side contacting portions  16   a . Upon connection, the IC card  30  is inserted and fitted to the cover  12  in a direction depicted by an arrow  32 . After the IC card  30  is fitted, the cover  12  is rotated as depicted by an arrow  33  to be overlapped onto the housing  11 . At this time, the cover shaft portions  13  are located at a position nearest to the one end  11   a  of the housing  11 .  
         [0035]    After the cover  12  is overlapped to the housing  11 , the cover  12  is pressed downward and forced to slide towards the other end  11   b  of the housing  11 . Then, the card-side contacting portions  31  are brought into press contact with the contact-side contacting portions  16   a  and the cover locking portions  14  are inserted below the locking plates  22 . When the downward pressing force is released in the above-mentioned state, the cover  12  is lifted up under restoring force of the cover holding spring  19 . Thus, the IC card  30  is properly connected to the connector  10 . When the cover  12  is forced to slide, appropriate click feeling is obtained by the action of the frictional locking arrangement.  
         [0036]    In the state illustrated in FIGS. 5A to  5 D where the cover  12  is closed, each of the cover locking portions  14  is engaged with a Z-direction engaging portion  22   b  of the locking plate  22  in the direction Z and with a Y-direction engaging portion  22   c  in the direction Y, irrespective of whether the IC card  30  is connected or not. The Z-direction and the Y-direction engaging portions  22   b  and  22   c  defines a recess portion  22 d opened in the direction Z. The cover locking portion  14  is fitted to the recess portion  22   d  when engaged with the Z-direction engaging portion  22   b . As a consequence, in the state where the cover  12  is closed, the cover locking portions  14  are locked to the locking plates  22  both in the direction Z and in the direction Y Thus, a mechanical locking arrangement formed by mechanical locking between the cover locking portions  14  and the housing locking portions  21  is put into a locked state. Therefore, the cover  12  is reliably locked in a closed state. Even if the connector  10  is subjected to strong mechanical shock, for example, when the apparatus equipped with the connector  10  is dropped, the cover  12  is inhibited from being unintentionally opened.  
         [0037]    Next referring to FIGS. 6A, 6B,  7 A,  7 B,  8 , and  9 , description will be made of operation of opening the cover  12 .  
         [0038]    At first, as depicted by an arrow  41  in FIG. 6A, the cover  12  is pressed downward by a finger  40 . Then, the cover  12  is slightly moved down and urges the cover holding spring  19 . Therefore, the cover locking potions  14  are separated from the Z-direction engaging portions  22   b  of the locking plates  22 .  
         [0039]    Next, as depicted by an arrow  42  in FIG. 7A, the cover  12  is pressed by the finger  40  towards the one end  11  a of the housing  11 . Then, the cover  12  slides along the housing  11  and the cover locking portions  14  move over the locking plates  22  to be completely separated from the housing locking portions  21 . In the above-mentioned state, the cover  12  is in a closed state but the cover locking portions  14  are unlocked both in the direction Z and in the direction Y. Thus, the locked state of the mechanical locking arrangement mentioned above is released. When the cover  12  is forced to slid, appropriate click feeling is obtained under the action of the frictional locking arrangement.  
         [0040]    When the locked state of the mechanical locking arrangement is released, the cover  12  is slightly lifted up under restoring force of the cover holding spring  19  as illustrated in FIG. 8. Then, by picking the rotating end of the cover  12  by the finger  40  and lifting the rotating end as depicted by an arrow  43 , the cover  12  can easily be opened.  
         [0041]    As depicted by an arrow  44  in FIG. 9, the cover  12  is rotated and opened. Then, it is possible to insert the IC card  30  into the cover  12  as illustrated in FIG. 4 and to remove the IC card  30  therefrom.  
         [0042]    In the foregoing, description has been directed to a case where each of the cover locking portions  14  and the locking plates  22  is made of metal. Alternatively, as illustrated in FIGS. 10A and 10B, each of the cover locking portions  14  and the locking plates  22  may be made of an insulating substance such as resin. In FIGS. 10A and 10B also, similar parts are designated by like reference numerals.