News Column

Researchers Submit Patent Application, "Rfid Tag and Fuse", for Approval

August 21, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor OZAKI, Noritsugu (Yokohama, JP), filed on March 28, 2014, was made available online on August 7, 2014.

The patent's assignee is Fujitsu Limited.

News editors obtained the following quote from the background information supplied by the inventors: "The related art RFID tag includes a plurality of antennas for receiving radio waves, an IC part for performing signal processing on the received radio waves, and thermal fuses disposed on connecting parts between the antennas and the IC part. The thermal fuses are configured to melt by heat generated in the IC part while receiving radio waves exhibiting high signal levels, which may detach the antennas from the IC part. Since the antennas are irreversibly detached, excessive electric power supply to the IC part is terminated, which may prevent the IC part from being damaged by heat.

"However, when the management of temperature rise in articles is attempted by utilizing such an RFID tag including the thermal fuses, the identifier of the RFID tag is not able to be read by a reader device after the temperature rises to melt the thermal fuses."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "Hence, it is desirable to provide a fuse and an RFID tag capable of being read when the temperature rises.

"According to an aspect of an embodiment, there is provided an RFID tag that includes an antenna; a first IC chip connected to the antenna; and a first fuse inserted between the antenna and the first IC chip, or inserted in series with the antenna, where the first fuse becomes electrically conductive at a first temperature or above, and remains in an electrical conductive state after having become electrically conductive.

"The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the appended claims.

"It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention as claimed.

BRIEF DESCRIPTION OF DRAWINGS

"FIG. 1A is a perspective diagram illustrating an RFID tag 100 according to a first embodiment;

"FIG. 1B is a plan diagram illustrating the RFID tag 100 according to the first embodiment;

"FIG. 2 is a diagram illustrating an antenna pattern of the RFID tag 100 according to the first embodiment;

"FIG. 3A is a cross-sectional diagram illustrating the RFID 100 according to the first embodiment including an IC chip 30 and a fuse 50;

"FIG. 3B is an exploded diagram of the fuse 50;

"FIG. 4 is a diagram illustrating a state in which solder of the fuse 50 of the RFID tag 100 according to the first embodiment has melted;

"FIG. 5A is a cross-sectional diagram cut along a broken line VA-VA of FIG. 1B illustrating the RFID 100 according to the first embodiment including an IC chip 40 and a fuse 60;

"FIG. 5B is an exploded diagram of the fuse 60;

"FIG. 6 is a diagram illustrating a state in which solder of the fuse 60 in the RFID tag 100 according to the first embodiment has melted;

"FIG. 7 is a table illustrating relationships between composition and melting point of solder;

"FIG. 8 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 9 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 10 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 11 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 12 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 13 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 14 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 15 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 16 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 17 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 18 is a stepwise diagram illustrating a production process of the RFID tag 100 according to the first embodiment;

"FIG. 19A is a diagram illustrating modification of the antenna pattern of the RFID tag 100 according to the first embodiment;

"FIG. 19B is a diagram illustrating modification of the antenna pattern of the RFID tag 100 according to the first embodiment;

"FIG. 20 is a cross-sectional diagram illustrating modification of the RFID 100 according to the first embodiment including the IC chip 30 and the fuse 50;

"FIG. 21 is a perspective diagram illustrating an RFID tag 200 according to a second embodiment;

"FIG. 22 is a diagram illustrating an antenna pattern of the RFID tag 200 according to the second embodiment;

"FIG. 23 is a perspective diagram illustrating an RFID tag 300 according to a third embodiment; and

"FIG. 24 is a diagram illustrating an antenna pattern of the RFID tag 300 according to the third embodiment."

For additional information on this patent application, see: OZAKI, Noritsugu. Rfid Tag and Fuse. Filed March 28, 2014 and posted August 7, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=5980&p=120&f=G&l=50&d=PG01&S1=20140731.PD.&OS=PD/20140731&RS=PD/20140731

Keywords for this news article include: Fujitsu Limited.

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Source: Politics & Government Week


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