RFID tag

Patent metadata

Field	Value
Publication number	US-10032104-B2
Application number	US-201715608093-A
Country	US
Kind code	B2
Filing date	May 30, 2017
Priority date	Jun 2, 2016
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

An RFID tag includes: a flexible, sheet-shaped substrate; an antenna pattern that is formed on the substrate; an IC chip that is mounted on the substrate and that is connected to the antenna pattern; an adhesive member that adheres the IC chip to the substrate; and a reinforcement member that covers the IC chip and the adhesive, and that is at a position such that a central portion of the reinforcement member is offset along a length direction of the substrate with respect to the IC chip and the adhesive member.

First claim

What is claimed is:

1. An RFID tag comprising:
a flexible, sheet-shaped substrate;
an antenna pattern that is formed on the substrate;
an IC chip that is mounted on the substrate and that is connected to the antenna pattern;
an adhesive member that adheres the IC chip to the substrate; and
a reinforcement member that covers the IC chip and the adhesive, and that is at a position such that a central portion of the reinforcement member is offset along a length direction of the substrate with respect to the IC chip and the adhesive member.

2. The RFID tag of claim 1 , wherein:
in the length direction of the substrate, the IC chip and the adhesive member are disposed between the central portion of the reinforcement member and one end portion of the reinforcement member.

3. The RFID tag of claim 1 , wherein:
the reinforcement member includes a first reinforcement member disposed at a front side of the substrate and a second reinforcement member disposed at a back side of the substrate.

4. The RFID tag of claim 3 , wherein:
a central portion of the first reinforcement member and a central portion of the second reinforcement member are positioned at the same position as each other along the length direction of the substrate with respect to the IC chip and the adhesive member.

5. The RFID tag of claim 4 , wherein:
the central portion of the first reinforcement member and the central portion of the second reinforcement member are at the same position as each other along the length direction of the substrate.

6. The RFID tag of claim 4 , wherein:
the positions of the central portion of the first reinforcement member and the central portion of the second reinforcement member are offset from each other along the length direction of the substrate.

7. The RFID tag of claim 4 , wherein:
the positions of one end portion of the first reinforcement member and one end portion of the second reinforcement member are offset from each other along the length direction of the substrate.

8. The RFID tag of claim 1 , wherein:
the reinforcement member is overlaid onto a surface of the substrate on an opposite side to the side where the IC chip is mounted.

9. The RFID tag of claim 1 , wherein:
a connection portion on the antenna pattern to the IC chip extends along a width direction of the substrate; and
the reinforcement member covers the connection portion.

10. The RFID tag of claim 1 , wherein:
the central portion of the reinforcement member is at a position offset along the length direction and a width direction of the substrate with respect to the IC chip and the adhesive member.

11. The RFID tag of claim 1 , wherein:
the reinforcement member is disposed with its longitudinal direction along a width direction of the substrate.

12. The RFID tag of claim 1 , wherein:
the reinforcement member includes a pair of notches that are open at both width direction sides of the substrate, and
the pair of notches are formed at positions offset along the length direction of the substrate with respect to the IC chip and the adhesive, and are at the same position as each other along the length direction of the substrate.

13. The RFID tag of claim 1 , wherein:
the reinforcement member includes a groove that extends along a width direction of the substrate and that is formed at a position offset along the length direction of the substrate with respect to the IC chip and the adhesive.

14. The RFID tag of claim 1 , wherein:
the IC chip is disposed with its longitudinal direction along a width direction of the substrate.

15. The RFID tag of claim 1 , wherein Equation (1) and Equation (2) given below are satisfied,

λ
=

L
/

(

h
/
2

⁢

3

)

≧
100

(
1
)

L
≦

π
⁢

⁢
h

2
⁢

3

⁢

E
σ

(
2
)

wherein, for the reinforcement member, λ is the linear extension ratio, L is the length, h is the thickness, E is the Young's modulus, and σ is the compressive stress acting on the reinforcement member along the length direction of the substrate.

16. The RFID tag of claim 1 , wherein Equation (3), Equation (4), and Equation (5) given below are satisfied,
λ= L /( h/ 2√{square root over (3)})≤100  (3)

4σ<σ c   (4)

2σ<σ b   (5)

wherein, for the reinforcement member, λ is the linear extension ratio, L is the length, h is the thickness, 4σ is the compressive stress acting on a back surface central portion of the reinforcement member, 2σ is the tensile stress acting on a front surface central portion of the reinforcement member, σ c is the compressive strength, and σ b is the tensile strength.

17. The RFID tag of claim 1 , wherein:
the antenna pattern includes a lead-out portion that leads out along the length direction of the substrate from an end portion of the reinforcement member; and
a notch-shaped escape portion is formed in the end portion of the reinforcement member at a position overlapping with the lead-out portion in a plan view of the reinforcement member.

18. The RFID tag of claim 1 , wherein:
the lead-out portion is disposed at a position offset along a width direction of the substrate with respect to the central portion of the reinforcement member.

19. The RFID tag of claim 1 , wherein:
a central portion of the substrate and the central portion of the reinforcement member are at the same position as each other along the length direction of the substrate.

20. The RFID tag of claim 1 , wherein:
the reinforcement has one of a quadrilateral shape, a circular shape, a rectangular shape, a square shape, or an elliptical shape

Assignees

• Fujitsu Ltd
• Fujitsu Frontech Ltd

Inventors

• Matsumura Takayoshi
• Sugimura Yoshiyasu
• Baba Shunji
• Miyazawa Hideo
• Miura Mimpei

Classifications

• G06K19/077

  Constructional details, e.g. mounting of circuits in the carrier · CPC title

• G06K19/027

  the material being suitable for use as a textile, e.g. woven-based RFID-like labels designed for attachment to laundry items (markings attached to laundry items in general D06F93/00) · CPC title

• G06K19/025

  the material being flexible or adapted for folding, e.g. paper or paper-like materials used in luggage labels, identification tags, forms or identification documents carrying RFIDs (methods for testing the genuineness of valuable papers, e.g. banknotes or passports G07D7/00; constructional features of booklets and the like B42D) · CPC title

• G06K19/07728

  the record carrier comprising means for protection against impact or bending, e.g. protective shells or stress-absorbing layers around the integrated circuit · CPC title

• G06K19/0723 Primary

  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 title