Title:
脆弱連結部を備えた無線周波数回路を使用する湿潤度センサー
Document Type and Number:
Japanese Patent JP6576394
Kind Code:
B2
Abstract:
A wetness sensor includes a substrate that carries a tuned RF circuit. The circuit includes a conductive pattern applied to the substrate, a capacitor, and a jumper all disposed on a same side of the substrate. The conductive pattern includes an inductive coil, and an inner and outer terminus. The jumper electrically couples the inner terminus to the outer terminus. The jumper also includes a frangible link which, when contacted by a target fluid, produces a drastic change in the operation of the RF circuit. The drastic change can be interpreted by a remote reader as a “wet” condition. Contact of the frangible link by the target fluid may change the impedance or resistance of the RF circuit by at least a factor of 5, 10, 100, or more, and/or may cause the frangible link to disintegrate to produce an open circuit, and/or may substantially render the RF circuit inoperative.
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Inventors:
Justin M. Johnson
Lori-An S. Olow
Brinda Bee. Badli
James Sea Vanus
Robert D. Lorenz
Jacob D. Chatterton
Stephen Jay Peron
Donald Earl. Battles
Lori-An S. Olow
Brinda Bee. Badli
James Sea Vanus
Robert D. Lorenz
Jacob D. Chatterton
Stephen Jay Peron
Donald Earl. Battles
Application Number:
JP2017132358A
Publication Date:
September 18, 2019
Filing Date:
July 06, 2017
Export Citation:
Assignee:
3M INNOVATIVE PROPERTIES COMPANY
International Classes:
G01N27/00; G01N27/02
Domestic Patent References:
| JP2009519051A |
Foreign References:
| EP2275805A1 | ||||
| US6677859 | ||||
| WO2000079497A1 |
Attorney, Agent or Firm:
Taro Akazawa
Wakako Nomura
Tsukuda Seigen
Keiichi Asamura
Wakako Nomura
Tsukuda Seigen
Keiichi Asamura