METAL-SUITABLE RFID TAG AND RFID TAG UNIT THEREFOR

• US 20080018479A1
• Filed: 10/01/2007
• Published: 01/24/2008
• Est. Priority Date: 04/01/2005
• Status: Active Grant

• Current Assignee: Fujitsu Frontech Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
• Inventors: SUGIMURA, Yoshiyasu, KAWAMATA, Hiroshi, HASHIMOTO, Shigeru
• Granted Patent: US 7,741,972 B2
• Time in Patent Office: Days
• US Class Current: 340/572.8
• 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 19/07771 the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
• CPC Class Codes: H01Q 1/2208 associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal

Abstract

An RFID tag unit is constituted of a seal member part, a substrate material part layered on the seal member part, and a print member part layered on the substrate material part. An RFID tag that comprises an LSI chip, an antenna and an impedance adjustment part is formed on the surface of the substrate material part. Of the seal member part and substrate material part, a part positioned under the impedance adjustment part is cut off, and an impedance adjustment part cutoff part is equipped in the cutoff area. Cutting the impedance adjustment part cutoff part off the RFID tag unit cuts the impedance adjustment part, which has been connected to the antenna, from the RFID tag.

Claims

1. A radio frequency identification (RFID) tag unit of a metal-suitable RFID tag which comprises a substrate material, an RFID tag formed on the substrate material, a print body part layered on the substrate material and a seal part formed on the back of the substrate material and in which an impedance adjustment part is connected to an antenna of the RFID tag, comprising:

an impedance adjustment part cutoff part allowing a cutoff of the impedance adjustment part.

2. The RFID tag unit according to claim 1, wherein

said impedance adjustment part cutoff part is equipped in the substrate material and seal part.

3. The RFID tag unit according to claim 2, wherein a perforation is formed on said impedance adjustment part cutoff part.

4. The RFID tag unit according to claim 2, wherein said impedance adjustment part cutoff part comprises a seal part equipped under said impedance adjustment part.

5. The RFID tag unit according to claim 4, wherein said impedance adjustment part is equipped in an area cut off of the substrate material.

6. The RFID tag unit according to claim 5, wherein

said seal part comprises

a sub-seal member equipped under said impedance adjustment part, and

a main seal member equipped under the sub-seal member and coming into contact with said sub-seal member.

7. The RFID tag unit according to claim 6, wherein

said sub-seal member comes into contact with the substrate material.

8. The RFID tag unit according to claim 6, wherein

a first adhesive member is formed in a layer in which said sub-seal member is formed.

9. The RFID tag unit according to claim 8, wherein

said sub-seal member is formed so as not to contact with said first adhesive member,

said main seal is formed so as to contact with the first adhesive member, and

a second adhesive member is formed between the sub-seal member and the substrate material.

10. A metal-suitable radio frequency identification (RFID) tag, comprising:

an RFID tag unit according to claim 1, and

a metal sheet part which comprises a spacer part and a metal reflection part and which is formed on the back of the RFID tag unit.

11. The RFID tag unit according to claim 5, wherein a gap is provided between said impedance adjustment part and the substrate material in said cutoff area.

12. The RFID tag unit according to claim 6, wherein said impedance adjustment part is formed on said sub-seal.

13. The RFID tag unit according to claim 12, wherein said impedance adjustment part is formed on said sub-seal by printing.

14. The RFID tag unit according to claim 12, wherein

said impedance adjustment part is formed on said sub-seal by etching.