RFID tag

• US 7,274,296 B2
• Filed: 02/23/2005
• Issued: 09/25/2007
• Est. Priority Date: 11/09/2004
• Status: Expired due to Fees

• Current Assignee: Fujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
• Original Assignee: Fujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
• Inventors: Sugimura, Yoshiyasu, Baba, Shunji, Kira, Hidehiko, Ishikawa, Naoki, Kobayashi, Hiroshi, Hashimoto, Shigeru
• Primary Examiner(s): PHAM, TOAN NGOC
• Application Number:
  US11/062,483
• Publication Number:
  US 20060097877A1
• Time in Patent Office: 944 Days
• Field of Search: 340/572.4, 340/572.7, 340/572.1, 340/572.8, 340/568.1, 235/492
• US Class Current: 340/572.4
• CPC Class Codes: G06K 19/073 Special arrangements for circuits, e.g. for protecting identification code in memory protection against unauthorised use of computer memory G06F12/14
• CPC Class Codes: G06K 19/0739 the incapacitated circuit being part of an antenna
• CPC Class Codes: H01L 2224/0401 Bonding areas specifically adapted for bump connectors, e.g. under bump metallisation [UBM]
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/73204 the bump connector being embedded into the layer connector
• CPC Class Codes: H01L 23/49855 for flat-cards, e.g. credit cards cards per se G06K19/00
• CPC Class Codes: H01L 23/573 using passive means
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details

Abstract

The present invention provides an RFID tag that is very effective in preventing fraudulent uses. The RFID tag includes a base, an antenna pattern provided on the base, a breakdown pattern provided on the base, a circuit chip connected to both the antenna pattern and the breakdown pattern, and a cover that is bonded to the base in a strippable condition so as to cover the antenna pattern, the breakdown pattern and the circuit chip and is caused to come off together with all or a part of the breakdown pattern during stripping from the base. The breakdown pattern is transparent, or the cover conceals a remaining part of the breakdown pattern, or the breakdown pattern has a specific part that produces predetermined electrical properties and the cover conceals the specific part.

Claims

1. An RFID tag, comprising:

a base;

a first pattern that is provided on the base and forms an antenna for communication;

a second pattern that is provided on the base and is formed from a transparent conductor;

a circuit chip that is electrically connected to the first pattern and the second pattern and performs radio communication via the antenna and detects a breakdown of the second pattern; and

a cover that is bonded to the base in a strippable condition so as to cover the first pattern, the second pattern and the circuit chip and is caused to come off together with all or a part of the second pattern during stripping from the base.

2. An RFID tag, comprising:

a base;

a first pattern that is provided on the base and forms an antenna for communication;

second pattern that is provided on the base and is formed from a conductor;

a circuit chip that is electrically connected to the first pattern and the second pattern and performs radio communication via the antenna and detects a breakdown of the second pattern; and

a cover that is bonded to the base in a strippable condition so as to cover and conceal the first pattern, the second pattern and the circuit chip and is caused to separate into a concealing part and an exposure part during stripping from the base wherein said concealing part remains with said base and said exposure part is removed with a portion of the second pattern corresponding to the exposure part.

3. The RFID tag according to claim 2, wherein the second pattern is formed from a transparent conductor.

4. The RFID tag according to claim 2, wherein the cover has, on the side thereof in contact with the second pattern, the same color as the conductor of the color of the second pattern.

5. An RFID tag, comprising:

a base;

a first pattern that is provided on the base and forms an antenna for communication;

a second pattern that is provided on the base and has a specific part in which a conductor is arranged so as to produce prescribed electrical properties;

a circuit chip that is electrically connected to the first pattern and the second pattern and performs radio communication via the antenna and detects electrical properties generated by the presence of the specific part in the second pattern; and

a cover that is bonded to the base in a strippable condition so as to cover the first pattern, the second pattern and the circuit chip and conceal at least the specific part of the second pattern and is caused to come off together with the specific part during stripping from the base.

6. The RFID tag according to claim 5, wherein the second pattern is formed from a transparent conductor.

7. The RFID tag according to claim 5, wherein the cover has, on the side thereof in contact with the second pattern, the same color as the conductor of the color of the second pattern.