Abstract:
The invention relates to a reading device for types of different-sized cards. The aim of the invention is to be able to use the types of cards in a selective manner. At least two identical trays ( 4,5 ) comprising readers ( 11,12 ) are provided for both types of cards. An adapter ( 20 ) having outer dimensions corresponding to the largest-size type of card is used to introduce a smaller-size card.

Description:
This application is a 371 of PCT/EP02/09753 filed on Aug. 31, 2002. 
   FIELD OF THE INVENTION 
   The invention concerns a reading device for card types of different size. Such reading devices can be integrated, for example, in car radios, which, in addition to the actual radio reception, may serve for mobile telephone use and/or navigation or other functions. 
   BACKGROUND ART 
   According to the state of the art, in the case of mobile telephones, SIM (Subscriber Identification Module) cards are used for user identification. The assigned reader has a tray which is adapted to the size of SIM cards. A push/push function for locking and unlocking the SIM card in the tray is problematic because then the SIM cards protrude only about 2 mm from the opening of the tray and thus are difficult to handle. 
   Furthermore, SD cards are known as storage medium. They are suitable for storing music, for example, in the MP3 format, driver&#39;s log data and/or navigational data. The operation with data recall or data input can be done through keys, knobs or multifunctions of the operating elements provided in a car radio. 
   A reader for an SD card has a tray into which the SD card can be inserted only in the correct position, which is achieved by appropriate design of the guides provided on the tray and on the edges of the SD card. In this case, a push/push function for locking and unlocking the SD card in the corresponding reader presents no problem for the user. 
   The cards of the first type, especially SIM cards, have a smaller size than the cards of the second type, especially SD cards. Correspondingly, the opening slits of the reader also have a different width and, optionally, a different height. 
   In vehicles, especially integrated in car radios, both of the above card types or similar card types should be able to be used for communication, information or entertainment. It is not preferable to provide two separate reading devices for these, for reasons of placement and design. In addition, there is a danger that, inadvertently, the user will insert the SIM card, which is smaller than the SD card, into the tray of the SD reader and then the card will disappear. 
   DE 43 36 522 C2 describes a card reader/writer device for common use of cards which are not touched or are touched. The cards serve for access control and are required by the reading device. 
   In DE 199 25 076 A1, a double SIM card reader is described. There is no provision for reading of cards of a different size. 
   Card-reading devices for chip cards and/or SIM cards with different thickness are known from DE 195 16 987 A1 and DE 199 30 389 A1. Apart from their thickness, the cards to be recognized have the same size. 
   In the publication MID 2000 Molded Interconnect Devices, 4th International Congress, Sep. 27–28, 2000, Erlangen Germany, ISBN 3-87525-135-0, it is described that, using the MID technology, three-dimensionally structured switches can be produced and that, in these, conducting paths can be applied on a three-dimensionally designed plastic part that can serve as carrier. 
   The task of the invention is to propose a reading device of the type mentioned at the outset, which is constructed so that both or several types of cards can be used alternatively. 
   SUMMARY OF THE INVENTION 
   According to the invention, the above task is solved by the characteristics of the reading device which is described as follows. In the same trays, a card type of larger size (SD card) and the card type of smaller size (SIM card) can be inserted alternatively. Here, the larger card type can be inserted directly into one of the trays—without adapter—and the other type of card, of smaller size, is held in the adapter and inserted into one of the trays. Since readers are arranged in each of the trays for one or the other type of card, the various card types can be evaluated in each of the trays. Thus, the user does not have to pay attention as to which tray is assigned to which type of card. The same functional result is obtained independently of whether the particular card is inserted into one or the other tray. 
   Since the two trays are identical, their opening slit is also the same, which permits a clear design for the reading device. 
   Preferably, the reading device is designed so that the card of larger size is an SD card and the card of smaller size is an SIM card. 
   Preferably, the trays are designed in such a way that locking and unlocking the card of larger size and the card of smaller size, carrying the adapter, is done by a push/push function. In this way, it is achieved that, even the cards of smaller size, carried by the adapter, can be simply locked and unlocked with a push/push function. 
   Other advantageous embodiments of the invention follow from the description of a practical example given below. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The drawings show the following: 
       FIG. 1  is a perspective view of a reading device, in which an SD card or an adapter is shown partially inserted into the tray. 
       FIG. 2  is an enlarged partial view of the left tray in  FIG. 1 . 
       FIG. 3  is an enlarged partial view of the right tray in  FIG. 1 . 
       FIG. 4  is an SD card, and 
       FIG. 5  is an adapter for an SIM card. 
   

   DETAILED DESCRIPTION 
   A reading device  1 , which is suitable for incorporating into a vehicle together with a car radio, has a base carrier  2  with a shutter strip  3  (see  FIG. 1 ), which can be a part of a shutter of the car radio. 
   A left tray  4  and a right tray  5  are provided in the reading device  1 . The two trays  4 ,  5  have the same construction. A slit  6 ,  7  of shutter  3  is assigned to each of trays  4 ,  5 . A field  8  is provided between slits  6 ,  7 , in which a light sensor can be arranged for controlling the illumination brightness of the car radio and/or an infrared interface can be installed. 
   Each of the two trays  4 ,  5  has a right guide edge  9  and a left guide edge  10 . On each of the two trays  4 ,  5 , on one side a reader  11  is provided for a type of card of small size, especially an SIM card and a reader  12  on the other side, for a type of card of larger size, especially an SD card.  FIGS. 1 to 3  show contact elements  11 ′ of reader  11 , which contact any inserted SIM card. Only the base plate  12 ′ is shown for reader  12  in  FIGS. 1 to 3 ; in order to simplify the drawing, the elements that sense the SD card are not shown. They act through one or several openings  12 ″ of base plate  12 ′ in the particular tray  4 ,  5 . 
   According to  FIGS. 2 and 3 , the base carrier  2  has a first circuit board  13  with a common pinboard  14 . Reader  12  is contacted with circuit board  13 . In another circuit board plane, circuit boards  15  are arranged on circuit board  13 , each of which carries reader  11  for the SIM cards assigned to tray  4  or  5 . Wiring pins  16  connect circuit boards  15  with circuit board  13 . However, it is possible to construct the base carrier  2  using MID technology. Then the base carrier  2  is a three-dimensionally formed plastic structural part, which forms two planes of circuit boards which carry the two readers  11 ,  12  assigned to tray  4  and the two readers  11 ,  12  assigned to tray  5 . Readers  11 ,  12  are essentially contact elements which contact the particular cards and which are electrically connected to pinboard  14 . 
   Trays  4 ,  5  are designed in such a way that the known SD card  17  (see  FIG. 4 ) and the adapter  20  described below can be pushed into it with a push/push function, can be locked and unlocked and removed from it. 
   The SD card  17  has a stepped profile on its outer edges  18 ,  19 . A corresponding stepped structure  9 ′,  10 ′ is provided in the guide edges  9 ,  10  of trays  4 ,  5 . This ensures that the SD card  17  can be inserted only in the correct position into one or the other tray  4 ,  5  in such a way that it acts on the reader  12  assigned to it. 
   An adapter  20  (see  FIG. 5 ) is provided for holding an SIM card. For this purpose, adapter  20  has a recess  21 , the inside shape of which is adapted to the outer shape of the SIM card, so that an SIM card can be inserted into adapter  20  only in the correct position. 
   The outer shape of adapter  20  is the same as the outer shape of SD card  17 . The outer edges  22 ,  23  of adapter  20  have a stepped structure which corresponds to the stepped structure on the outer edges  18 ,  19  of the SD card  17 . Thus adapter  20  can be inserted into one or the other tray  4 ,  5  only in the correct position, and the SIM card is assigned in the correct position to the reader  11  provided for it. 
   When a user wishes to use an SIM card, he/she pushes it—placed in adapter  20 —optionally into the left tray  4  or right tray  5 . The user can then insert the SD card into the other tray. Therefore, the user does not have to be concerned with inserting the SIM card and SD card into the correct trays. Both trays  4 ,  5  are suitable for insertion of an SD card as well as for insertion of an SIM card in adapter  20 .