Paper tag identified by using radiofrequency and method of manufacturing the same

• US 20050173541A1
• Filed: 12/06/2004
• Published: 08/11/2005
• Est. Priority Date: 02/05/2004
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kanda, Naoya, Inoue, Kosuke, Honma, Hiroshi
• Granted Patent: US 7,185,823 B2
• Time in Patent Office: Days
• US Class Current: 235/492
• CPC Class Codes: G06K 19/07728 the record carrier comprising means for protection against impact or bending, e.g. protective shells or stress-absorbing layers around the integrated circuit
• 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 19/0775 arrangements for connecting the integrated circuit to the antenna
• CPC Class Codes: H01L 2224/16 of an individual bump connector
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/16227 the bump connector connecting to a bond pad of the item
• CPC Class Codes: H01L 2224/81395 having an external coating, e.g. protective bond-through coating
• CPC Class Codes: H01L 2924/01057 Lanthanum [La]
• CPC Class Codes: H01L 2924/01079 Gold [Au]

Abstract

A paper-like RFID tag is fabricated by bonding bumps of an RFID chip to an antenna to connect the chip to the antenna, the antenna being formed by a metal foil bonded onto a base film or a base tape, providing a protecting material around the RFID chip so that an upper surface becomes higher than that of the RFID chip, to constitute an RFID thread, and inlaying the RFID thread in between first and second paper layers to afford a paper-like structure. The thickness of the paper-like RFID tag fabricated as above is 0.1 mm or less. Further, the paper-like RFID tag is of high quality and has a surface smoothness almost equal to that of the ordinary type of paper, permitting a long-distance communication.

Claims

1. A paper-like RFID tag comprising:

an RFID thread provides;

a base member;

an antenna which is formed by a metallic foil and bonded onto said base member;

an RFID chip which is connected by bonding through bumps to said antenna; and

a protecting material which has a thickness such that height of an upper surface thereof is larger than that of said RFID chip;

wherein the RFID thread is inlaid between a first paper layer and a second paper layer to afford a paper-like structure.

2. The paper-like RFID tag according to claim 1, wherein said protecting material has a window within which said RFID chip is received.

3. The paper-like RFID tag according to claim 1, wherein said protecting material is a film-like material or a metallic material.

4. The paper-like RFID tag according to claim 1, wherein said protecting material is formed of a material higher in rigidity than said first and second paper layers.

5. The paper-like RFID tag according to claim 1, wherein said RFID thread is a tape-like thread wherein the width of said antenna and that of said base film are 3 mm or less.

6. The paper-like RFID tag according to claim 1, wherein said base member is a film or a tape.

7. A method of manufacturing a paper-like RFID tag, comprising:

an RFID thread assembly process of forming an RFID thread, said RFID thread assembly process includes;

a metal foil laminated film fabricating process of bonding a metal foil to one surface of a base member to form a metal foil laminated film;

an antenna pattern forming process of patterning said metal foil in said metal foil laminated film fabricated in said metal foil laminated film fabricating process to form an antenna;

a protecting material bonding process of bonding a protecting material around an RFID chip on said antenna, said protecting material having a thickness such that the height of an upper surface thereof becomes larger than that of said RFID chip when the RFID chip is bonded by bonding pumps to said antenna; and

an RFID chip bonding process of bonding the bumps of said RFID chip to said antenna; and

a paper making process of inlaying said RFID thread formed in said RFID thread assembly process in between a first paper layer and a second paper layer and conducting heating, pressurizing and dewatering with use of rolls and drying.

8. The method of manufacturing a paper-like RFID tag according to claim 7, wherein said antenna pattern forming process includes a resin layer forming process of forming on said metal foil a resin layer for patterning said metal foil to form said antenna.

9. The method of manufacturing a paper-like RFID tag according to claim 7, wherein a tape-like RFID thread is fed continuously and is inlaid between said first and second paper layers, in said paper making process.

10. The method of manufacturing a paper-like RFID tag according to claim 9, wherein said tape-like RFID thread is constituted by said antenna and said base film each having a width of 3 mm or less.

11. The method of manufacturing a paper-like RFID tag according to claim 7, wherein said protecting material used in said protecting material bonding process is a protecting tape formed with a window for receiving said RFID chip therein and higher in rigidity than said first and second paper layers.

12. The method of manufacturing a paper-like RFID tag according to claim 7, wherein said protecting material is a plastic or metallic material.

13. The method of manufacturing a paper-like RFID tag according to claim 7, wherein said protecting material has a C-shaped or doughnut-shaped surface.

14. The method of manufacturing a paper-like RFID tag according to claim 7, wherein said paper making process is carried out using a multi-cylinder paper machine.

15. A method of manufacturing a paper-like RFID tag, comprising:

an RFID thread assembly process of forming an RFID thread, said RFID thread assembly process includes;

a metal foil laminated film fabricating process of bonding a metal foil to one surface of a base member to form a metal foil laminated film;

an antenna pattern forming process of patterning said metal foil in said metal foil laminated film fabricated in said metal foil laminated film fabricating process to form an antenna;

a protecting tape bonding process of bonding a protecting tape around an RFID chip on said antenna, said protecting tape having a thickness such that the height of an upper surface thereof becomes larger than that of said RFID chip when the RFID chip is bonded by bonding bumps to said antenna; and

an RFID chip bonding process of bonding the bumps of said RFID chip to said antenna; and

a paper making process of inlaying said RFID thread formed in said RFID thread assembly process in between a first paper layer and a second paper layer and conducting heating, pressurizing and dewatering with use of rolls and drying.

16. The method of manufacturing a paper-like RFID tag according to claim 15, wherein said antenna pattern forming process includes a resin layer forming process of forming a resin layer on said metal foil for patterning the metal foil to form said antenna.

17. The method of manufacturing a paper-like RFID tag according to claim 15, wherein said protecting tape used in said protecting tape bonding process is higher in rigidity than said first and second paper layers.