Two Dimensional Stress Reproduction Using Ultrasound Tactile Display

We proposed a new tactile display which produces spatio-temporal stress patterns on a 2D plane. In this paper, the first prototype is reported. The display consists of eight ultrasound linear arrays arranged so that the PZT pieces were concentric octagons. In order to produce 2D spatio-temporal stress patterns, the focal point of ultrasound was scanned over the display surface. We measured the waveform of the sound pressure at the focal point and the spatial distribution of the radiation pressure around the focal point. The data showed that the temporal and spatial property of the display were sufficiently fine for our method for producing 2D spatio-temporal stress patterns