Noncontact IC card interface unit and communication system using the interface unit

• US 5,664,157 A
• Filed: 03/30/1995
• Issued: 09/02/1997
• Est. Priority Date: 04/08/1994
• Status: Expired due to Term

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Takahira, Kenichi, Hayamizu, Koichi
• Primary Examiner(s): Tesha, Huin J.
• Assistant Examiner(s): DEHLITSCH, NICHOLE L
• Application Number:
  US08/413,959
• Time in Patent Office: 887 Days
• Field of Search: 235/491, 235/492, 235/493, 235/380, 395/500
• US Class Current: 703/23
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer

Abstract

An interface unit includes an interface controller for controlling a bidirectional signal relative to an external host computer, a communication controller for controlling data communication with a noncontact IC card according to an output signal sent from the host computer, and a memory accessible by both the interface controller and communication controller. A noncontact IC card is very useful because of its accessibility at a remote place. A connector of the noncontact IC card can be protected from mechanical damage. With the interface unit, the noncontact IC card can be accessed as quickly as a contact IC card is.

Claims

1. A noncontact IC card interface unit for communicating between an external host computer and a noncontact IC card comprising:

a connector for connecting an interface unit to an external host computer;

first control means electrically connected to said connector for controlling a bidirectional signal relative to said external host computer;

second control means electrically connected to said first control means and receiving an output signal from said external host computer through said first control means for controlling data communication with a noncontact IC card in response to the output signal;

electromagnetic-wave signal communicating means electrically connected to said second control means for transmitting and receiving a bidirectional electromagnetic-wave signal relative to the noncontact IC card;

a bus to which said first control means and said second control means are connected; and

a memory electrically connected to and accessible through said bus by said first control means and said second control means.

2. The noncontact IC card interface unit according to claim 1, comprising mode selector means for changing between a normal mode in which the noncontact IC card is accessed through said electromagnetic-wave signal communicating means and a charge mode in which a secondary battery incorporated in the noncontact IC card is charged through said electromagnetic-wave signal communicating means.

3. The noncontact IC card interface unit according to claim 2 wherein said mode selector means includes frequency changer means for changing an electromagnetic-wave signal frequency transmitted from said electromagnetic-wave signal communicating means to the noncontact IC card between a first frequency for the normal mode and a second frequency for the charge mode.

4. The noncontact IC card interface unit according to claim 1 wherein said electromagnetic-wave signal communicating means has a housing and a noncontact IC card mounting portion in which a noncontact IC card may be mounted is located in said housing.

5. The noncontact IC card interface unit according to claim 4 wherein:

said noncontact IC card interface unit comprises;

a body containing said connector, said first control means, said second control means, and said memory; and

an antenna including said electromagnetic-wave signal communicating means wherein said antenna is integrated into and pivotable with respect to said body.

6. The noncontact IC card interface unit according to claim 1 wherein said noncontact IC card interface unit has a housing in which said connector, said first control means, said second control means, said memory, and said electromagnetic-wave signal communicating means are located.

15. The noncontact IC card according to claim 1 wherein said second control means comprises:

a microprocessor for controlling the operation of said second control means;

a ROM for storing instructions and data used by said microprocessor;

a register for receiving the output signal from said first control means;

an input/output circuit for transmitting data to said electromagnetic-wave signal communicating means and for receiving data from said electromagnetic-wave signal communicating means;

a buffer memory for storing data received from said first control means, for storing data received from said electromagnetic-wave signal communicating means, and for storing data and instructions for said microprocessor; and

a controller bus electrically interconnecting said microprocessor, said ROM, said register, said input/output circuit, and said buffer memory.

7. A communication system for communicating between a host computer and a noncontact IC card comprising:

a noncontact IC card having a memory;

a host computer for providing an output signal for accessing said memory in said noncontact IC card; and

a noncontact IC card interface unit for receiving the output signal from said host computer for enabling data communication between said host computer and said noncontact IC card, said noncontact IC card interface unit including;

a connector for connecting an interface unit to an host computer;

first control means electrically connected to said connector for controlling a bidirectional signal relative to said host computer;

second control means electrically connected to said first control means and receiving the output signal from said host computer through said first control means for controlling data communication with said noncontact IC card according to the output signal;

electromagnetic-wave signal communicating means electrically connected to said second control means for transmitting and receiving a bidirectional electromagnetic-wave signal relative to said noncontact IC card;

a bus to which said first control means and said second control means are connected; and

a memory electrically connected to and accessible through said bus by said first control means and said second control means.

8. The communication system according to claim 7 wherein said noncontact IC card interface unit includes interface mode selector means for changing between a normal mode in which said memory in said noncontact IC card is accessed through said electromagnetic-wave signal communicating means and a charge mode in which a secondary battery incorporated in said noncontact IC card is charged through said electromagnetic-wave signal communicating means.

9. The communication system according to claim 8 wherein said interface mode selector means in said non-contact IC card interface unit includes frequency changer means for changing an electromagnetic-wave signal frequency transmitted from said electromagnetic-wave signal communicating means to said noncontact IC card between a first frequency for the normal mode and a second frequency for the charge mode.

10. The communication system according to claim 7 wherein said noncontact IC card interface unit has card mode changer means for changing between a normal mode in which said noncontact IC card is accessed by said noncontact IC card interface unit and a charge mode in which a secondary battery incorporated in said noncontact IC card is charged.

11. The communication system according to claim 10 wherein said card mode changer means in said noncontact IC card includes frequency changer means for changing the frequency of the electromagnetic-wave signal received from said electromagnetic-wave signal communicating means in said interface unit between the normal mode and the charge mode.

12. The communication system according to claim 10 wherein said card mode changer means in said noncontact IC card includes cutoff means for cutting off an activation signal for activating said noncontact IC card and sent from said host computer through said noncontact IC card interface unit when said noncontact IC card is in the charge mode.

13. The communication system according to claims 7 wherein:

said noncontact IC card interface unit includes a housing in which said connector, said first control means, said second control means, said memory, and said electromagnetic-wave signal communicating means are located;

said host computer has a host connector, said host connector including an interface unit mounting portion in which said housing of said noncontact IC card interface unit is mounted, and a noncontact IC card mounting portion in which said noncontact IC card may be mounted so that said noncontact IC card is substantially parallel to said interface unit.

14. The communication system according to claim 7 wherein:

said memory in said noncontact IC card interface unit is segmented into a plurality of blocks, each block having a predetermined length in bytes;

said memory in said noncontact IC card has a larger storage capacity than said memory in said noncontact IC card interface unit and is segmented into a plurality of blocks each block having the same length in bytes as each of said blocks constituting said memory in said noncontact IC card interface unit;

data transfer is performed block by block between said memory in said noncontact IC card interface unit and said memory in said noncontact IC card; and

said noncontact IC card interface unit has a tag memory for storing addresses of blocks transferred from said memory of said noncontact IC card to said memory in said noncontact IC card interface unit.

16. The noncontact IC card according to claim 7 wherein said second control means comprises:

a microprocessor for controlling the operation of said second control means;

a ROM for storing instructions and data used by said microprocessor;

a register for receiving the output signal from said first control means;

an input/output circuit for transmitting data to said electromagnetic-wave signal communicating means and for receiving data from said electromagnetic-wave signal communicating means;

a buffer memory for storing data received from said first control means, for storing data received from said electromagnetic-wave signal communicating means, and for storing data and instructions for said microprocessor; and

a controller bus electrically interconnecting said microprocessor, said ROM, said register, said input/output circuit, and said buffer memory.