Identifying system of overlapped tag

• US 20030057279A1
• Filed: 08/19/2002
• Published: 03/27/2003
• Est. Priority Date: 11/11/1998
• Status: Active Grant

• Current Assignee: Gakuji Uozumi, Osamu Ishihara, Tomohiro Mori
• Original Assignee: Gakuji Uozumi, Osamu Ishihara, Tomohiro Mori
• Inventors: Ishihara, Osamu, Mori, Tomohiro, Uozumi, Gakuji
• Granted Patent: US 6,840,440 B2
• Time in Patent Office: Days
• US Class Current: 235/451
• CPC Class Codes: G06K 19/0701 at least one of the integrated circuit chips comprising an arrangement for power management
• 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 19/0726 the arrangement including a circuit for tuning the resonance frequency of an antenna on the record carrier
• 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 19/07777 the antenna being of the inductive type
• CPC Class Codes: G06K 19/07779 the inductive antenna being a coil
• CPC Class Codes: G06K 19/07783 the coil being planar
• CPC Class Codes: G06K 19/07796 arrangements on the record carrier to allow stacking of a plurality of similar record carriers, e.g. to avoid interference between the non-contact communication of the plurality of record carriers
• 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

Even if two or more tags are overlapped, or tag and metal plate are overlapped, the tags are certainly identified.

Tags 11-13 appended to articles has an antenna coil 14 and a RFID device 16 connected to the antenna coil and two or more resonance capacitors 19a-19n are connected to the antenna coil in parallel and connected to each other in parallel.

Since two or more switches 24a-24n connected respectively to two or more resonance capacitors, and switches 24a-24h connect or intercept electrically two or more resonance capacitors with an antenna coil and a RFID device respectively, a control circuit 25 operates on-off controls of the switches.

Since the control circuit operates the on-off controls of the switches, it is constituted so that the resonance frequency of the resonance circuit comprising the antenna coil and the resonance capacitors can be changed.

Claims

1. An identifying system for overlapped tags by which a resonance frequency of a resonance circuit, comprising antenna coils (14, 44) and two or more resonance capacitors (19a-19n), can be changed, characterized by comprising;

in the tag appended to an article (17), equipped with the antenna coils (14, 44) and a RFID device (16) connected with the antenna coils (14, 44), it has the resonance capacitors (19a-19n) connected in parallel with the antenna coil (14, 44) and connected each other in parallel, two or more switches (24a-24n) which connect or intercept electrically the resonance capacitors (19a-19n), with the antenna coils (14, 44) and the RFID device (16) and a control circuit (25), which operates on-off controls of the switches (24a-24n), respectively, and the control circuit (25) operates the on-off controls of the switches (24a-24n).

2. An identifying system for overlapped tags by which a resonance frequency of a resonance circuit comprising an antenna coil (54) and a resonance capacitor (56a) built in a RFID device (56), can be changed, characterized by comprising;

in the tag appended to an article, equipped with the antenna coil (54) and the RFID device (56) connected with the antenna coil (54), it has two or more leads (57a-57n) whose ends are connected to a winding of the antenna coil (54) with predetermined intervals and the other ends are connected to the RFID device (56), two or more switches (58a-58n) prepared in the leads (57a-57n) respectively, which respectively connect or intercept electrically the antenna coil (54) and the RFID device (56) through the leads (57a-57n), and a control circuit (25) which closes alternatively the switches (58a-58n).

3. An identifying system for overlapped tags by which a resonance frequency of a resonance circuit comprising an antenna coil (74), two or more capacitors (77a-77n) for capacity adjustment and a resonance capacitor (76a) built in a RFID device (76), can be changed, characterized by comprising;

in the tag appended to an article, equipped with the antenna coil (74) and the RFID device (76) connected with the antenna coil (74), it has the capacitors (77a-77n) for capacity adjustment connected in series with the antenna coil (74) and connected in parallel with each other, two or more switches (78a-78n) connected respectively with the capacitors (77a-77n) for capacity adjustment, which electrically connect or intercept, the capacitors (77a-77n) for capacity adjustment with the antenna coil (74) and the RFID-device (76) respectively, and a control circuit (25) which operates on-off controls of the switches (78a-78n).

4. An identifying system for overlapped tag characterized by comprising;

in the tag appended to an article, equipped with the antenna coil (94) for overlapping and a RFID device (96) with which the antenna coil (94) for overlapping is connected, and in which a capacitor (96a) for overlapping is built and when predetermined number of sheets of tags (91) are overlapped, one of or both of inductance of an antenna coil (94) for overlapping and a capacitor (96a) for overlap is set up so that the resonance frequency of each overlapped tag (91) becomes the same with that of the resonance frequency of an un-overlapped single tag (91).

5. An identifying system for overlapped tag in claim 4, in which an antenna coil for independence and a RFID device for independence, which resonate when the tag is not overlapped, are prepared with an antenna coil for overlapping and a RFID device for overlapping.