Noncontact type IC card and system for noncontact transfer of information using the same

• US 4,960,983 A
• Filed: 06/23/1988
• Issued: 10/02/1990
• Est. Priority Date: 09/28/1987
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Inoue, Takesi
• Primary Examiner(s): Levy, Stuart S.
• Assistant Examiner(s): Weinhardt, Robert A.
• Application Number:
  US07/210,231
• Time in Patent Office: 831 Days
• Field of Search: 235/449, 235/380, 235/492, 235/488, 235/493, 235/439, 235/440, 235/450, 235/487, 360/123
• US Class Current: 235/449
• 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 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 7/10336 the antenna being of the near field type, inductive coil

Abstract

A system for noncontact transfer of information between an IC card and a card reader/writer, wherein the IC card and the card reader/writer each comprises an IC chip having a logic circuit and at least one electromagnetically inductive coil for transfer of information integrated therein. A power supply is located at least partly on the IC card for providing power to the IC chip of the IC card.

Claims

1. In a system for nonconduct transfer of information between an IC card and a card reader/writer, the improvement comprising:

a first integrated circuit chip on the IC card, said first chip comprising a card logic circuit for controlling the operation of said card, card information transfer means on the integrated circuit chip including at least a first electromagnetically inductive coil for effecting electromagnetic transfer of information and means for coupling said first coil to said card logic circuit, said first coil having multiple spiral windings with at least the innermost of said windings enclosing an area on the chip which is smaller than the area occupied by the logic circuit;

a second integrated circuit chip on the reader/writer, said second chip comprising reader/writer information transfer means having at least a second electromagnetically inductive coil for effecting electromagnetic transfer of information to and from said first coil of said IC card; and

supply means located at least partly on said IC card for providing power to said first integrated circuit chip.

2. The improved system of claim 1 wherein at least one of said integrated circuit chips has a CMOS structure.

3. The improved system of claim 1 wherein at least one of said coils has a planar configuration.

4. The improvement system of claim 1 wherein at least one of said integrated circuit chips has a plurality of distinct layers and its corresponding coil comprises a plurality of coil members formed in said distinct layers and electrically connected to one another so as to increase the electromagnetic inductance of said coil.

5. The improved system of claim 4 wherein said plurality of coil members are disposed in axial alignment and electrically connected in series.

6. The improved system of claim 5 wherein adjacent coil members have the same inductive winding direction.

7. The improved system of claim 1 wherein said second integrated circuit chip further comprises a reader/writer logic circuit for controlling the transfer of information between said first and second coils and means for coupling said reader/writer logic circuit to said second coil.

8. The improved system of claim 1 wherein said first coil is formed so that at least a portion thereof is superimposed on its respective logic circuit.

9. The improved system of claim 1 wherein said supply means comprises:

a third coil in said first integrated circuit chip coupled to said card logic circuit for supplying power thereto; and

a fourth coil in said second integrated circuit chip which is configured to effect electromagnetic transfer of energy to said third coil.

10. The improved system of claim 9 wherein at least one of said coils has a planar configuration.

11. The improved system of claim 9 wherein at least one of said integrated circuit chips has a plurality of distinct layers and at least one of its corresponding coils comprises a plurality of coil members formed in said distinct layers and electrically connected to one another so as to increase the electromagnetic inductance of said coil.

12. The improved system of claim 11 wherein said plurality of coil members are disposed in axial alignment and electrically connected in series.

13. The improved system of claim 12 wherein adjacent coil members have the same inductive winding direction.

14. The improved system of claim 1 wherein each of said integrated circuit chips comprises a semiconductor substrate having a plurality of distinct layers thereon and the associated coil is a metallized pattern formed on at least one layer of said semiconductor substrate.

15. In a system for noncontact transfer of information between an IC card and a card reader/writer, the improvement comprising:

a first integrated circuit chip on the IC card, said first chip comprising a card logic circuit for controlling the operation of said card, card information transfer means on the first integrated circuit chip including a first electromagnetically inductive coil for effecting electromagnetic transfer of information, a second electromagnetically inductive coil and means for coupling said coils to said card logic circuit, each of said first and second coils having multiple spiral windings with at least the innermost of said windings enclosing an area which is smaller than the rear occupied by the logic circuit; and

a second integrated circuit chip on the reader/writer, said second chip comprising reader/writer information transfer means including a third electromagnetically inductive coil for effecting electromagnetic transfer of information to and from said first coil of said IC card and a fourth electromagnetically inductive coil which is configured to effect electromagnetic transfer of energy to said second coil of said IC card.

16. An IC card for noncontact transfer of information with a card reader/writer, comprising:

an integrated circuit chip having a logic circuit for controlling the operation of said card, information transfer means on the integrated circuit chip including at least a first electromagnetically inductive coil for effecting electromagnetic transfer of information with said card reader/writer and means for coupling said first coil to said logic circuit, said coil having multiple spiral windings with at least the innermost of said windings enclosing an area on the chip which is smaller than the area occupied by the logic circuit; and

supply means located at least partly on said IC card for providing power to said integrated circuit chip.

17. The IC card of claim 16 wherein said integrated circuit chip has a CMOS structure.

18. The IC card of claim 16 wherein said integrated circuit chip comprises a semiconductor substrate having a plurality of distinct layers thereon and said coil is a metallized pattern formed on at least one layer of said semiconductor substrate.

19. The IC card of claim 18 wherein said coil comprises metallized patterns on said plurality of layers, which patterns are electrically connected to one another so as to increase the electromagnetic inductance of said coil.

20. The IC card of claim 16 wherein said coil is formed so that at least a portion thereof is superimposed on said logic circuit.

21. The IC card of claim 16 wherein said supply means comprises a second coil in said integrated circuit chip coupled to said logic circuit for receiving energy from said card reader/writer and supplying that energy to said logic circuit.