Integrated circuit, non-contact IC card, reader/writer, wireless communications method, and computer program

• US 20070284451A1
• Filed: 06/11/2007
• Published: 12/13/2007
• Est. Priority Date: 06/13/2006
• Status: Active Grant

• Current Assignee: FeliCa Networks, Inc
• Original Assignee: FeliCa Networks, Inc
• Inventors: Uramoto, Yoichi
• Granted Patent: US 7,922,092 B2
• Time in Patent Office: Days
• US Class Current: 235/492
• 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 19/0724 the arrangement being a circuit for communicating at a plurality of frequencies, e.g. for managing time multiplexed communication over at least two antennas of different types

Abstract

An integrated circuit, a non-contact IC card, a reader/writer, a wireless communications method, and a computer program are provided to improve communication. The integrated circuit configured to execute wireless communication by means of magnetic field. The integrated circuit has a resonance circuit having resonance frequencies of a plurality of levels, a confirmation block configured to confirm whether a predetermined condition is satisfied, and a switching block configured to change the resonance frequencies if the predetermined condition is found satisfied as a result of the confirmation.

Claims

1. An integrated circuit configured to execute wireless communication by use of a magnetic field, comprising:

a resonance circuit having resonance frequencies of a plurality of levels;

a confirmation block configured to confirm whether a predetermined condition is satisfied; and

a switching block configured to change said resonance frequencies if said predetermined condition is found satisfied as a result of the confirmation.

2. The integrated circuit according to claim 1, wherein said predetermined condition is a predetermined count executed in said confirmation block.

3. The integrated circuit according to claim 1, wherein said predetermined condition is a predetermined period of time measured in said confirmation block.

4. The integrated circuit according to claim 1, further comprising

a capacitor having capacitances of a plurality of levels,

said switching block switching between said capacitances to change said resonance frequencies.

5. The integrated circuit according to claim 1, further comprising

an inductor having inductances of a plurality of levels,

said switching block switching between said inductances to change said resonance frequencies.

6. A non-contact integrated circuit card comprising

an integrated circuit as set forth in claim 1.

7. An information processing terminal comprising

an integrated circuit as set forth in claim 1.

8. A card reader/writer comprising

an integrated circuit as set forth in claim 1.

9. A wireless communications method based on an integrated circuit having a resonance circuit having resonance frequencies of a plurality of levels, comprising the steps of:

confirming whether a predetermined conditions is satisfied; and

changing said resonance frequencies by switching between said resonance frequencies if said predetermined condition is found satisfied.

10. A computer program configured to control an integrated circuit having resonance frequencies of a plurality of levels, comprising the processes of:

confirming whether a predetermined conditions is satisfied; and

changing said resonance frequencies by switching between said resonance frequencies if said predetermined condition is found satisfied.