Abstract:
There is provided a card socket having a simple construction capable of preventing erroneous insertion of a smaller card than a predetermined one. An erroneous card insertion-preventing member has a fixed portion fixed to the housing, an elastic portion coupled to the fixed portion, and a stopper coupled to the elastic portion. The elastic portion is elastically deformed when a predetermined card is inserted so as to be pushed out of a card insertion path, but not elastically deformed when a card having a smaller size than the predetermined one is inserted so as to remain on the path. The predetermined card can be inserted deeply due to the stopper being moved out of the path in accordance with the deformation of the elastic portion, whereas the card having the smaller size is blocked by the stopper.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a card socket that allows insertion and ejection of a card, such as an IC card and a magnetic card, and more particularly to a card socket that is capable of inhibiting insertion of a card having a smaller size than a predetermined size. 
     2. Description of the Prior Art 
     A card socket is used, for example, as a card connector for connecting an IC card to electronic equipment, a component part of a magnetic card reader/writer, etc. 
     A conventional card socket includes a housing and erroneous card insertion-preventing means. 
     The housing has a card insertion port and a card-receiving space for receiving a card inserted through the card insertion port. 
     The erroneous card insertion-preventing means is a device that allows a card to be inserted to the inner part of the card-receiving space when the card has a predetermined thickness, and prevents a card from being inserted to the inner part of the card-receiving space when the card has a smaller thickness than the predetermined thickness. 
     The erroneous card insertion-preventing means is comprised of a plurality of members, and inhibits insertion of a card having a smaller thickness than the predetermined thickness (see Japanese Laid-Open Patent Publication (Kokai) No. 9-35021). 
     In the above publication, the erroneous card insertion-preventing means is comprised of a sensor lever having a sensing piece and a pressing piece, and a shutter lever having a contact piece and a shutter piece. 
     In this example, an IC card having the predetermined thickness is inserted through the card insertion port to have its leading end pass by the sensing piece of the sensor lever, the sensor lever pivotally moves through a predetermined angle and presses the contact piece of the shutter lever by the pressing piece thereof to cause the shutter piece of the shutter lever to be retracted from a card insertion path to allow the advance of the IC card into a card-receiving space. On the other hand, when an object having a smaller thickness than the predetermined thickness is inserted, the pressing piece of the sensor lever is not brought into contact with the contact piece of the shutter lever, and hence the shutter piece stays in the card passage to block the advance of the inserted object into the card-receiving space. 
     However, the construction of the erroneous card insertion-preventing means of the conventional card socket is complicated as described above, which is liable to cause malfunction. Further, the erroneous card insertion-preventing means is susceptible to failure, and what is worse, the manufacturing cost thereof is high. 
     SUMMARY OF THE INVENTION 
     It is an object of the invention to provide a card socket which is capable of preventing erroneous insertion of a card having a smaller size than a predetermined size by a simplified construction. 
     To attain the above object, according to a first aspect of the invention, there is provided a card socket comprising: 
     a housing having a card insertion port and a card-receiving space that receives a card inserted through the card insertion port; 
     an elastic member that is arranged on a card insertion path extending from the card insertion port to an inner end of the card-receiving space, for being brought into contact with the card on condition that the card has a predetermined size, to thereby undergo elastic deformation such that the elastic member is pushed out of the card insertion path; and 
     a stopper that is coupled to the elastic member, and arranged on the card insertion path, for being pushed out of the card insertion path in accordance with the elastic deformation of the elastic member to allow the advance of the card when the card has the predetermined size, and for remaining on the card insertion path to block the advance of the card when the card has a size smaller than the predetermined size. 
     According to this card socket, it is possible to prevent erroneous insertion of a card having a size smaller than a predetermined size, by a simpler construction than the conventional card socket. 
     Preferably, the housing includes an elastic member-receiving recess for receiving the elastic member that has undergone the elastic deformation to be pushed out of the card insertion path, and a stopper-receiving recess for receiving the stopper that has been pushed out of the card insertion path in accordance with the elastic deformation of the elastic member. 
     More preferably, the card socket further comprises a fixing member that is integrally formed with the elastic member, for fixing the elastic member to a front end of the housing at a location out of the card insertion path, and the elastic member is arranged such that the elastic member extends obliquely from the fixing member into the card insertion path when the elastic member has not undergone the elastic deformation, the stopper being integrally formed with the elastic member at an opposite side to the fixing member with respect to a card-inserting direction. 
     Further preferably, the stopper vertically projects from at least one of two lateral sides of the elastic member, and the stopper-receiving recess comprises at lest one cutout formed in a manner associated with the stopper such that the at least one cutout each divides a corresponding one of keys provided at inner lateral walls of the housing, whereby the card socket prevents insertion of the card when the card has a thickness smaller than a thickness of the predetermined size. 
     Further preferably, the elastic member comprises a pair of elastic members extending in the form of a strip along immediately inward of inner lateral walls of the housing, and the stopper extends laterally such that the stopper connects the pair of elastic members, the stopper-receiving recess being laterally formed in an inner bottom of the housing in association with the stopper, whereby the card socket prevents insertion of the card when the card has a width smaller than a width of the predetermined size. 
     Further preferably, the elastic member comprises a pair of elastic members extending in the form of a strip along inner lateral walls of the housing, and the stopper comprises a first stopper vertically projecting from at least one of two lateral sides of the elastic member, and a second stopper extending laterally such that the second stopper connects the pair of elastic members, the stopper-receiving recess comprising at lest one cutout formed in association with the first stopper such that the at least one cutout each divides a corresponding one of keys provided at the inner lateral walls, and a lateral recess laterally formed in an inner bottom of the housing in association with the second stopper, whereby the card socket prevents insertion of the card when the card has a thickness smaller than a thickness of the predetermined size or a width smaller than a width of the predetermined size. 
     To attain the above object, according to a second aspect of the invention, there is provided a card socket including a housing having a card insertion port and a card-receiving space that receives a card inserted through the card insertion port, and erroneous card insertion-preventing means that when the card has a predetermined thickness, allows insertion of the card to an inner end of the card-receiving space, and when the card has a thickness smaller than the predetermined thickness, prevents insertion of the card toward the inner end of the card-receiving space, 
     wherein the erroneous card insertion-preventing means comprises: 
     a fixed portion fixed to the housing; 
     an elastic portion coupled to the fixed portion, for being elastically deformed when a card having the predetermined thickness is inserted through the card insertion port, to be pushed out of a card insertion path extending from the card insertion port to the inner end of the card-receiving space, and for not being elastically deformed when a card having a thickness smaller than the predetermined thickness is inserted through the card insertion port, to remain on the card insertion path; and 
     a stopper coupled to the elastic portion, for being moved out of the card insertion path when the elastic portion is pushed out of the card insertion path, to thereby allow the advance of the card having the predetermined thickness, and for remaining on the card insertion path when the elastic portion is not pushed out of the card insertion path, to thereby block the advance of the card having the thickness smaller than the predetermined thickness. 
     According to this card socket, the erroneous card insertion-preventing means is comprised of the fixed portion, the elastic portion coupled to the fixed portion, and the stopper coupled to the elastic portion, and these portions are integrally formed with each other. Therefore, it is possible to prevent erroneous insertion of a card having a thickness smaller than the predetermined thickness by the erroneous card insertion-preventing means having a simpler construction than the conventional erroneous card insertion-preventing means. 
     To attain the above object, according to a third aspect of the invention, there is provided a card socket including a housing having a card insertion port and a card-receiving space that receives a card inserted through the card insertion port, and erroneous card insertion-preventing means that when the card has a predetermined width, allows insertion of the card to an inner end of the card-receiving space, and when the card has a width smaller than the predetermined width, prevents insertion of the card toward the inner end of the card-receiving space, 
     wherein the erroneous card insertion-preventing means comprises: 
     a fixed portion fixed to the housing; 
     an elastic portion coupled to the fixed portion, for being elastically deformed when a card having the predetermined width is inserted through the card insertion port, to be pushed out of a card insertion path extending from the card insertion port to the inner end of the card-receiving space, and for not being elastically deformed when a card having a width smaller than the predetermined width is inserted through the card insertion port, to remain on the card insertion path; and 
     a stopper coupled to the elastic portion, for being moved out of the card insertion path when the elastic portion is pushed out of the card insertion path, to thereby allow the advance of the card having the predetermined width, and for remaining on the card insertion path when the elastic portion is not pushed out of the card insertion path, to thereby block the advance of the card having the width smaller than the predetermined width. 
     According to this card socket, it is possible to prevent erroneous insertion of a card having a width smaller than the predetermined width by the erroneous card insertion-preventing means having a simpler construction than the conventional erroneous card insertion-preventing means. 
     To attain the above object, according to a fourth aspect of the invention, there is provided a card socket including a housing having a card insertion port and a card-receiving space that receives a card inserted through the card insertion port, and erroneous card insertion-preventing means that when the card has a predetermined thickness and a predetermined width, allows insertion of the card to an inner end of the card-receiving space, and when the card has a thickness smaller than the predetermined thickness or a width smaller than the predetermined width, prevents insertion of the card toward the inner end of the card-receiving space, 
     wherein the erroneous card insertion-preventing means comprises: 
     a fixed portion fixed to the housing; 
     an elastic portion coupled to the fixed portion, for being elastically deformed when a card having the predetermined thickness and the predetermined width is inserted through the card insertion port, to be pushed out of a card insertion path extending from the card insertion port to the inner end of the card-receiving space, and for not being elastically deformed when a card having a thickness smaller than the predetermined thickness or a width smaller than the predetermined width is inserted through the card insertion port, to remain on the card insertion path; and 
     a stopper coupled to the elastic portion, for being moved out of the card insertion path when the elastic portion is pushed out of the card insertion path, to thereby allow the advance of the card having the predetermined thickness and width, and for remaining on the card insertion path when the elastic portion is not pushed out of the card insertion path, to thereby block the advance of the card having the thickness smaller than the predetermined thickness or the width smaller than the predetermined width. 
     According to this card socket, it is possible to prevent erroneous insertion of a card having a thickness smaller than the predetermined thickness or a card having a width smaller than the predetermined width by the erroneous card insertion-preventing means having a simpler construction than the conventional erroneous card insertion-preventing means. 
     The above and other objects, features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a card connector according to a first embodiment of the invention, with a cover removed therefrom; 
     FIG. 2 is a plan view of the FIG. 1 card connector, with the cover removed therefrom; 
     FIG. 3 is a perspective view of the appearance of the FIG. 1 card connector; 
     FIG. 4 is a perspective view of the appearance of the FIG. 1 card connector having an IC card of a predetermined size inserted therein; 
     FIG. 5 is a cross-sectional view taken on line A—A of FIG.  2  and showing the FIG. 1 card connector having the IC card of the predetermined size inserted therein; 
     FIG. 6 is a front view of the FIG. 1 card connector having the IC card of the predetermined size inserted therein; 
     FIG. 7 is a cross-sectional view taken on line A—A of FIG.  2  and showing the FIG. 1 card connector having an IC card inserted therein which is of a size smaller in thickness than the predetermined size; 
     FIG. 8 is a front view of the FIG. 1 card connector having the IC card inserted therein which is of the size smaller in thickness than the predetermined size; 
     FIG. 9 is a perspective view of a card connector according to a second embodiment of the invention, with a cover removed therefrom; 
     FIG. 10 is a perspective view of the FIG. 9 card connector in a state in which elastic portions thereof are elastically deformed; 
     FIG. 11 is a plan view of the FIG. 9 card connector, with the cover removed therefrom; 
     FIG. 12 is a perspective view of the appearance of the FIG. 9 card connector having the IC card of the predetermined size inserted therein; 
     FIG. 13 is a cross-sectional view taken on line B—B of FIG.  11  and showing the FIG. 9 card connector having the IC card of the predetermined size inserted therein; 
     FIG. 14 is a front view of the FIG. 9 card connector having the IC card of the predetermined size inserted therein; 
     FIG. 15 is a perspective view of the appearance of the FIG. 9 card connector having an IC card inserted therein which is of a size smaller in width than the predetermined size; 
     FIG. 16 is a cross-sectional view taken on line B—B of FIG.  11  and showing the FIG. 9 card connector having the IC card inserted therein which is of the size smaller in width than the predetermined size; 
     FIG. 17 is a front view of the FIG. 9 card connector having the IC card inserted therein which is of the size smaller in width than the predetermined size; 
     FIG. 18 is a perspective view of a card connector according to a third embodiment of the invention, with a cover removed therefrom; 
     FIG. 19 is a plan view of the FIG. 18 card connector, with a cover removed therefrom; 
     FIG. 20 is a cross-sectional view taken on line C—C of FIG.  19  and showing the FIG. 18 card connector having the IC card of the predetermined size inserted therein; 
     FIG. 21 is a front view of the FIG. 18 card connector having the IC card of the predetermined size inserted therein; 
     FIG. 22 is a cross-sectional view taken on line C—C of FIG.  19  and showing the FIG. 18 card connector having the IC card inserted therein which is of the size smaller in thickness than the predetermined size; 
     FIG. 23 is a front view of the FIG. 18 card connector having the IC card inserted therein which is of the size smaller in thickness than the predetermined size; 
     FIG. 24 is a cross-sectional view taken on line C—C of FIG.  19  and showing the FIG. 18 card connector having the IC card inserted therein which is of the size smaller in width than the predetermined size; and 
     FIG. 25 is a front view of the FIG. 18 card connector having the IC card inserted therein which is of the size smaller in width than the predetermined size. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The invention will now be described in detail with reference to the drawings showing preferred embodiments thereof. 
     FIG. 1 is a perspective view of a card connector according to a first embodiment of the invention, with a cover removed therefrom, while FIG. 2 is a plan view of the same, with a cover removed therefrom. FIG. 3 is a perspective view of the appearance of the FIG. 1 card connector, and FIG. 4 is a perspective view of the appearance of the FIG. 1 card connector having an IC card of a predetermined size inserted therein. FIG. 5 is a cross-sectional view taken on line A—A of FIG.  2  and showing the FIG. 1 card connector in the state shown in FIG.  4 . FIG. 6 is a front view of the FIG. 1 card connector in the state shown in FIG.  4 . FIG. 7 is a cross-sectional view taken on line A—A of FIG.  2  and showing the FIG. 1 card connector having an IC card inserted therein which is of a size smaller in thickness than the predetermined size. FIG. 8 is a front view of the FIG. 1 card connector in the state shown in FIG.  7 . 
     This card connector (card socket) includes a housing  3  and an erroneous card insertion-preventing member (erroneous card insertion-preventing means)  5 . 
     The housing  3  is comprised of a housing body  30  and a cover  37 . The housing body  30  has a bottom wall  31 , side walls  32 ,  33 , and a rear wall  34 . The bottom wall  31  is formed of a rectangular plate, and formed with a pair of retaining holes  31   a , an erroneous insertion-preventing member-receiving recess  31   b , and a plurality of contact insertion holes  31   e . The pair of retaining holes  31   a  extend longitudinally from a front end face of the bottom wall  31  along the side walls  32 ,  33 . The erroneous insertion-preventing member-receiving recess  31   b  is formed in a front portion of the bottom wall  31 , and has a pair of elastic portion-receiving recesses  31   c  and a connecting portion-receiving recess  31   d . The pair of elastic portion-receiving recesses  31   c  are continuous with the respective retaining holes  31   a  and extend longitudinally along the side walls  32 ,  33 . The connecting portion-receiving recess  31   d  extends in a direction orthogonal to the direction of length of the side walls  32 ,  33  to join the pair of elastic portion-receiving recesses  31   c.    
     The side walls  32 ,  33  each generally have the shape of a prism and are joined to respective side edges of the bottom wall  31 . The side walls  32 ,  33  have keys  32   a ,  33   a , respectively. The keys  32   a ,  33   a  are each divided by the connecting portion-receiving recess  31   d.    
     The rear wall  34  has the shape of a plate and is joined to the rear edge of the bottom wall  31 . The rear wall  34  has a plurality of contacts  9  fixed thereto. The contacts  9  are positioned above the contact insertion holes  31   e , respectively. 
     The cover  37  is mounted on the housing body  30  in a manner covering the same, whereby a card insertion port  3   a  and a card-receiving space  3   b  are formed between the housing body  30  and the cover  37  (see FIGS. 3,  5  and  7 ). 
     The erroneous card insertion-preventing member  5  is formed by stamping an elastic metal plate and then pressing the stamped metal plate into shape. The erroneous card insertion-preventing member  5  has a pair of fixed portions  51 , a pair of elastic portions  52 , a connecting portion  53 , and a pair of smaller thickness-card stoppers  54 . The fixed portions  51  are in the form of a strip, and are retained in respective states inserted into the retaining holes, thereby fixing the erroneous card insertion-preventing member  5  to a front end of the housing  3 , i.e. causing the erroneous card insertion-preventing member to be held in a state immovable in a direction along the side walls  32 ,  33 . The elastic portions  52  are also in the form of a strip. The elastic portions  52  are continuous with the fixed portions  51 , and extend longitudinally along the side walls  32 ,  33  through the elastic portion-receiving recesses  31   c , respectively. The connecting portion  53  is also in the form of a strip, and extends in the direction orthogonal to the direction of length of the side walls  32 ,  33 . The connecting portion  53  is formed in a manner continuous with the elastic portions  52 , and positioned above the connecting portion-receiving recess  31   d  so long as the elastic portions  52  are not elastically deformed. The smaller thickness-card stoppers  54  are formed continuous with the respective opposite ends of the connecting portion  53 , and extend vertically along the side walls  32 ,  33 . As described above, the erroneous card insertion-preventing member  5  has a simple construction in which the fixed portions  51 , the elastic portions  52 , the connecting portion  53 , and the stoppers  54  are integrally connected to each other. 
     Next, the operation of the card connector of the present embodiment will be described. 
     As shown in FIGS. 5 and 6, when one end of an IC card  20  of a predetermined size is inserted through the card insertion port  3   a , the elastic portions  52  are pressed downward by the bottom surface  22  of the IC card  20  and elastically deformed by a predetermined amount. As a result, the elastic portions  52  are pushed out of a card insertion path  3   c  (path to be taken by the forward end face of the IC card  20  when the IC card  20  is received into the card-receiving space  3   b ). When the elastic portions  52  are pushed out of the card insertion path  3   c , the connecting portion  53  is also pushed out of the card insertion path  3   c  and received into the connecting portion-receiving recess  31   d . At the same time, the smaller thickness-card stoppers  54  are pushed out of the card insertion path  3   c  and brought into respective cutouts  21  formed at the lateral sides of the bottom of the IC card  20   c . As a result, the smaller thickness-card stoppers  54  are kept from contact with the IC card  20 , so that the smaller thickness-card stoppers  54  cannot block the advance of the IC card  20 , and hence the IC card  20  is allowed to be inserted to the inner end of the card-receiving space  3   b.    
     It should be noted that if an attempt is made to insert the IC card  20  in a state turned upside down, into the card insertion port  3   a , the forward end face of the IC card  20  abuts against the keys  32   a ,  33   a  only to be inhibited from advancing. 
     As shown in FIGS. 7 and 8, when an IC card  40  having a size smaller in thickness than the predetermined size is inserted through the card insertion port  3   a , the elastic portions  52  do not make contact with the bottom surface  42  of the IC card  40 . Therefore, the elastic portions  52  are not elastically deformed, but stay on the card insertion path  3   c , and hence the smaller thickness-card stoppers  54  also stay on the card insertion path  3   c . Consequently, if the IC card  40  is attempted to be inserted deeper into the card-receiving space  3   b , the forward end face of the IC card  40  is bought into abutment with the smaller thickness-card stoppers  54 , which blocks further advance of the IC card  40 . 
     As described above, the card connector of the present embodiment makes it possible to prevent erroneous insertion of the IC card  40  having the size smaller in thickness than the predetermined size, using an erroneous card insertion-preventing member  5  having a simple construction. 
     FIG. 9 is a perspective view of the internal construction of a card connector according to a second embodiment of the invention, with a cover removed therefrom and FIG. 10 is a perspective view of the FIG. 9 card connector in a state in which elastic portions thereof are elastically deformed. FIG. 11 is a plan view of the FIG. 9 card connector, with the cover removed therefrom. FIG. 12 is a perspective view of the appearance of the FIG. 9 card connector having the IC card of the predetermined size inserted therein. FIG. 13 is a cross-sectional view taken on line B—B of FIG.  11  and showing the FIG. 9 card connector in the state shown in FIG. 12, while FIG. 14 is a front view of the FIG. 9 card connector in the state shown in FIG.  12 . FIG. 15 is a perspective view of the appearance of the FIG. 9 card connector having an IC card which is of a size smaller in width than the predetermined size inserted therein. FIG. 16 is a cross-sectional view taken on line B—B of FIG.  11  and showing the FIG. 9 card connector in the state shown in FIG. 15, while FIG. 17 is a front view of the FIG. 9 card connector in the state shown in FIG.  15 . 
     The card connector of the second embodiment is only partially different in construction from the card connector of the first embodiment, and hence description of portions similarly constructed is omitted. In the following, a description will be given of only differences in construction from the first embodiment. 
     While the card connector according to the first embodiment prevents erroneous insertion of the IC card  40  of the size smaller in thickness than the predetermined size is inhibited, the card connector according to the second embodiment is distinguished therefrom in that it prevents insertion of an IC card  60  having a size smaller in width than the predetermined size. 
     An erroneous insertion-preventing member-receiving recess  231   b  formed in a bottom wall  231  of a housing  203  has a pair of elastic portion-receiving recesses  231   c  and a stopper-receiving recess  231   d . The elastic portion-receiving recesses  231   c  are formed at respective spaced portions of keys  232   a  and  233   a  each divided into two segments, and extends longitudinally along side walls  232  and  233 . The stopper-receiving recess  231   d  extends in a direction orthogonal to the direction of length of the side walls  232 ,  233  to join the pair of elastic portion-receiving recesses  231   c.    
     The respective keys  232   a ,  233   a  of the side walls  232 ,  233  have front end portions thereof formed with retaining holes  232   b ,  233   b , respectively. 
     An erroneous card insertion-preventing member  205  has a pair of fixed portions  251 , a pair of elastic portions  252 , and a smaller width-card stopper  253 . The fixed portions  251  are retained in respective states inserted into the retaining holes  232   b ,  233   b . The elastic portions  252  are continuous with the fixed portions  251 , and extend longitudinally along the side walls  232 ,  233 , respectively. The elastic portions  252  are positioned above the respective elastic portion-receiving recesses  231   c . These elastic portions  252  extend immediately inward of the side walls  232 ,  233  along the same, and are formed to have as small a lateral width as possible, provided that they have a required elasticity. The smaller width-card stopper  253  extends in the direction orthogonal to the direction of length of the side walls  232 ,  233  to join the elastic portions  252 . The smaller width-card stopper  253  is positioned above the stopper-receiving recess  231   d  so long as the elastic portions  252  are not elastically deformed. 
     Next, the operation of the card connector of the present embodiment will be described. 
     As shown in FIGS. 12 to  14 , when one end of an IC card  20  of the predetermined size is inserted through the card insertion port  3   a , the elastic portions  252  are pressed downward by stepped surfaces  23  formed on the lateral sides of the bottom of the IC card  20  and facing the cutouts  21 , so as to be elastically deformed by a predetermined amount. As a result, the elastic portions  252  are pushed out of the card insertion path  3   c  and brought into the cutouts  21  of the IC card  20 . In accordance with this motion of the elastic portions  52 , the smaller width-card stopper  253  is also pushed out of the card insertion path  3   c  to be received in the stopper-receiving recess  231   d  (see FIG.  13 ). As a result, the smaller width-card stopper  253  is kept from contact with the IC card  20 , so that the smaller width-card stopper  253  cannot block the advance of the IC card  20 , and hence the IC card is allowed to be inserted to the inner end of the card-receiving space  3   b.    
     As shown in FIGS. 15 to  17 , when one end of an IC card  60  of a size smaller in width than the predetermined size is inserted through the card insertion port  3   a , the elastic portions  252  do not make contact with the IC card  60 . Therefore, the elastic portions  252  are not elastically deformed, but stay on the card insertion path  3   c , and hence the smaller width-card stopper  253  also stays on the card insertion path  3   c . Consequently, if the IC card  60  is attempted to be inserted deeper into the card-receiving space  3   b , the forward end face of the IC card  60  is bought into abutment with the smaller width-card stopper  253 , which prevents further advance of the IC card  60 . 
     As described above, the card connector of the present embodiment makes it possible to prevent erroneous insertion of the IC card  60  of the size smaller in width than the predetermined size, using an erroneous card insertion-preventing member  205  having a simple construction. 
     FIG. 18 is a perspective view of a card connector according to a third embodiment of the invention, with a cover removed therefrom, and FIG. 19 is a plane view of the same. FIG. 20 is a cross-sectional view taken on line C—C of FIG.  19  and showing the FIG. 18 card connector having the IC card of the predetermined size inserted therein. FIG. 21 is a front view of the FIG. 18 card connector in the state shown in FIG.  20 . FIG. 22 is a cross-sectional view taken on line C—C of FIG.  19  and showing the FIG. 18 card connector having the IC card inserted therein which is of the size smaller in thickness than the predetermined size. FIG. 23 is a front view of the FIG. 18 card connector in the state shown in FIG.  22 . Further, FIG. 24 is a cross-sectional view taken on line C—C of FIG.  19  and showing the FIG. 18 card connector having the IC card inserted therein which is of the size smaller in width than the predetermined size, while FIG. 25 is a front view of the FIG. 18 card connector in the state shown in FIG.  24 . 
     The card connector of the third embodiment is only partially different in construction from the card connector of the first embodiment, and hence description of portions similarly constructed is omitted. In the following, a description will be given of only differences in construction from the first embodiment. 
     While the card connector according to the first embodiment prevents erroneous insertion of the IC card  40  having the size smaller in thickness than the predetermined size, and that according to the second embodiment prevents erroneous insertion of the IC card  60  having the size smaller in width than the predetermined size, the card connector according to the third embodiment is distinguished from these card connectors in that it prevents erroneous insertion of both the IC card  40  and the IC card  60 . 
     A housing body  330  of a housing  303  has a pair of retaining holes  331   a  formed in respective opposite side portions of a bottom wall  331  thereof. 
     An erroneous insertion-preventing member-receiving recess  331   b  formed in the bottom wall  331  has a pair of elastic portion-receiving recesses  331   c  and a stopper-receiving recess  331   d . The elastic portion-receiving recesses  331   c  are formed adjacent to the keys  32   a ,  33   a , and extend longitudinally along the side walls  32 ,  33  of the housing body  330 , respectively. The stopper-receiving recess  331   d  extends in a direction orthogonal to the direction of length of the side walls  32 ,  33  to join the pair of elastic portion-receiving recesses  331   c.    
     An erroneous card insertion-preventing member  305  has a pair of fixed portions  351 , a pair of elastic portions  352 , a smaller width-card stopper  353 , and a pair of smaller thickness-card stoppers  354 . The fixed portions  351  are retained in respective states inserted into the retaining holes  331   a . The elastic portions  352  are continuous with the respective fixed portions  351 , and extend longitudinally along the side walls  32 ,  33  through the elastic portion-receiving recesses  331   c , respectively. The smaller width-card stopper  353  extends in the direction orthogonal to the direction of length of the side walls  32 ,  33  to join the elastic portions  352 . The smaller width-card stopper  353  is positioned above the stopper-receiving recess  331   d  so long as the elastic portions  352  are not elastically deformed. The smaller thickness-card stoppers  354  are formed continuous with the respective opposite ends of the smaller width-card stopper  353 , and extend in the direction of height of the side walls  32 ,  33 . 
     Next, the operation of the card connector of the present embodiment will be described. 
     As shown in FIGS. 20 and 21, when one end of an IC card  20  of the predetermined size is inserted through the card insertion port  3   a , the card connector operates as described in the first embodiment, so that the advance of the IC card  20  is not blocked. 
     As shown in FIGS. 22 and 23, when one end of an IC card  40  of the size smaller in thickness than the predetermined size is inserted through the card insertion port  3   a , the smaller thickness-card stoppers  354  block the advance of the IC card  40  as described in the first embodiment. 
     As shown in FIGS. 24 and 25, when one end of an IC card  60  of the size smaller in width than the predetermined size is inserted through the card insertion port  3   a , the smaller width-card stopper  353  blocks the advance of the IC card  60  as described in the second embodiment. 
     As described above, the card connector of the present embodiment makes it possible to prevent erroneous insertion of both the IC card  40  of the size smaller in thickness than the predetermined size and the IC card  60  of the size smaller in width than the predetermined size, using the erroneous card insertion-preventing member  305  having a simple construction. 
     Although in each of the first to third embodiments, the invention is applied to a card connector, this is not limitative, but the invention is applicable to any card socket which allows insertion and ejection of a card, including as an IC card, and a magnetic card. 
     It is further understood by those skilled in the art that the foregoing are the preferred embodiments of the invention, and that various changes and modifications may be made without departing from the spirit and scope thereof.