Analysis on a unique spectrum in complex space caused by a film-type proximity sensor and its application to pulse-wave measurement

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04419
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21030:Measurement engineering-related
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Ken-ichi Nomura 国立研究開発法人産業技術総合研究所, エレクトロニクス・製造領域, 研究チーム長 (00580078)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 近接センサ / インピーダンス / フィルム / 印刷 / 粘接着 / 実装 / チップ部品

Outline of Final Research Achievements

A highly sensitive proximity sensor sheet for human safety monitoring, based on an electric resonant circuit, has been fabricated. A capacitor structure (C) for detecting electrodes was fabricated using duplex printing of conductive ink on a film substrate with an adhesive layer. Further, a chip-type inductor (L) and a resistor (R) were implemented on the adhesive layer by the adhesive-assisted implementation technique, so that the parallel LC resonant circuit could be constituted. Although neither the expected anomalous trajectory on complex impedance nor the human pulse wave could not be observed, it was successfully demonstrated that the change in impedance, according to approaching a conductive material, became much higher than that of the non-resonance-type sensor.

Free Research Field

印刷エレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

見守り用途のセンサには、心身に負荷がかからないようにさりげなくありつつも、高感度で検出できること、さらに実用化時には大量に製造できるシンプルさが求められる。本研究で開発したセンサは、薄くて軽いフィルム基材の静電容量型近接センサをベースにしながらも、そこにLC共振回路構造を適用することで従来の近接センサに比して極めて高い応答性を実現した。またその構造は粘着体を利用した実装技術により簡易に形成することができ、高効率な製造に向けた道筋も付けることができた。