A track-pad is a pointing device, featuring a tactile sensor, able to translate the motion and position of a user's finger, or a stylus, to a relative position on a screen. In this paper a piezoelectric tactile sensor for track-pad applications is proposed; the active element of the device is a cheap piezoceramic bimorph disk, widely used in buzzers and telephone receivers, clamped all around its border. The device operating principle is the following: when a stylus is positioned on the bimorph surface, the displacement field of the contact point is modified, with a consequent variation of the device electrical input impedance; the stylus position can be therefore related to the impedance variation. The system was analyzed by FEM, obtaining a clear dependence of the device characteristic frequencies on the stylus radial position, while by moving the stylus along the angle, a clear variation of impedance values is obtained. A device prototype was realized and FEM results were experimentally confirmed, validating the proposed device performance.

Lamberti, N., Caliano, G., Savoia, A.S. (2015). ACUPAD: a Track-pad Device Based on a Piezoelectric Bimorph. SENSORS AND ACTUATORS. A, PHYSICAL, 222, 130-139 [10.1016/j.sna.2014.10.031].

ACUPAD: a Track-pad Device Based on a Piezoelectric Bimorph

CALIANO, Giosue';SAVOIA, ALESSANDRO STUART
2015-01-01

Abstract

A track-pad is a pointing device, featuring a tactile sensor, able to translate the motion and position of a user's finger, or a stylus, to a relative position on a screen. In this paper a piezoelectric tactile sensor for track-pad applications is proposed; the active element of the device is a cheap piezoceramic bimorph disk, widely used in buzzers and telephone receivers, clamped all around its border. The device operating principle is the following: when a stylus is positioned on the bimorph surface, the displacement field of the contact point is modified, with a consequent variation of the device electrical input impedance; the stylus position can be therefore related to the impedance variation. The system was analyzed by FEM, obtaining a clear dependence of the device characteristic frequencies on the stylus radial position, while by moving the stylus along the angle, a clear variation of impedance values is obtained. A device prototype was realized and FEM results were experimentally confirmed, validating the proposed device performance.
Lamberti, N., Caliano, G., Savoia, A.S. (2015). ACUPAD: a Track-pad Device Based on a Piezoelectric Bimorph. SENSORS AND ACTUATORS. A, PHYSICAL, 222, 130-139 [10.1016/j.sna.2014.10.031].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/115400
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