Yuichi Murozaki

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It is highly required to long-term monitoring of the biosignals under unbouded and non-invasive condition for health and safe management. Thus, we present biosingnal sensing by the miniaturized load sensing system using a quartz crystal resonator (QCR). We show a method of miniaturization of the sensing system and also measurement results of the biosignal(More)
A load sensor with high sensitivity, a wide measurement range, and a small size was developed by using an AT-cut quartz crystal resonator (QCR). The quartz crystal generates a charge that is proportional to the external force. Because it has high sensitivity and excellent temperature stability, it has been used for various sensors. In particular, a QCR has(More)
Monitoring of biosignals plays important roles in health management in daily life. Especially, the sensing method of biosignals, which does not require special efforts such as restraining people or wearing the sensors to measure them, is really important to maintain monitoring activities of people. We call such method what a sensing way should be for(More)
We successfully established a wafer level fabrication process of the quartz crystal resonator (QCR) load sensor using atomic diffusion bonding. The proposed sensor has three-layer structures; two Si-hold layers and a quartz layer. Using microfabrication and atomic diffusion bonding, the assembly process was simplified. The fabrication process enables(More)
High sensitive, wide-measurement range, and small sized load sensors was developed by using AT-cut quartz crystal resonator (QCR). The quartz crystal generates a charge which is proportional to the external force. Since it has high sensitivity and excellent temperature stability, it has been used for various sensors. Especially, QCR has superior(More)
We present a super wide-measurement range load sensor with high-durability for multi-biosignal sensing in daily life. We employed quartz crystal resonator (QCR) load sensor with super wide range (from 6 &#x00D7; 10<sup>-5</sup> to 30 [N]) for sensing of biosignals ranging from mN order (e.g. heartbeat) to 100 N order (e.g. body motion). Furthermore, we(More)
We present a force sensor with high-sensitivity and high-rigidity using quartz crystal resonator (QCR) for cellular force measurement. We integrated miniaturized QCR load sensor into cantilever utilizing the principal of leverage for improvement of sensing sensitivity. We show the measurement results of the cellular force using constructed sensing system.
Monitoring multiple biosignals, such as heart rate, respiration cycle, and weight transitions, contributes to the health management of individuals. Specifically, it is possible to measure multiple biosignals using load information obtained through contact with the environment, such as a chair and bed, in daily use. A wide-range load sensor is essential(More)
High-sensitive, wide-measurement range, and small-sized load sensor was developed using AT-cut quartz crystal resonator (QCR). The quartz crystal generates a charge, which is proportional to the external force. Since it has high sensitivity and excellent temperature stability, it has been used for various sensors. In particular, QCR has superior(More)
We present a super wide-measurement range load sensor with high-durability for multi-biosignal sensing in daily life. We employ quartz crystal resonator (QCR) load sensor with super wide range (from 6 &#x00D7; 10<sup>-5</sup> to 30 [N]) for sensing of biosignal ranges from mN order (e.g. heartbeat) to 100 N order (e.g. body motion). Furthermore, we(More)
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