This paper proposes a new operation method for portable devices and controllers using fingertip pressure. The proposed system provides multivalued, biaxial outputs according to the fingertip pressure from two directions. Strain sensors are used to detect microscopic strains caused by the fingertip pressure on the body of the portable device. For verification experiments, a prototype consisting of a detection circuit with two strain gauges and a 32 bit MPU with an aluminum body was manufactured, and various applications were implemented. The experimental results indicate that the prototype system can output accurate linear data proportional to fingertip pressure from two directions. With the proposed interface, the portable devices do not require a specific area, thickness, or position for input buttons on their bodies.
This paper proposes a new user interface that provides a multi-valued, linear output according to fingertip pressure. Our proposed interface uses a strain sensor to detect microscopic strain caused by fingertip pressure on the chassis of a portable information terminal unit.An experimental prototype, consisting of a detection circuit with two strain gauges and an embedded MPU, was manufactured to verify operation of the user interface. The results indicate that the prototype system provides accurate linear output proportional to the fingertip pressure. With the proposed interface, the terminal units do not require a specific area, thickness, or position for input buttons in the chassis.
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