Designing stationary airborne ultrasonic 3D tactile object

In this paper we denote the system to display aerial 3D virtual tactile object by using airborne ultrasound. By controlling acoustic pressure distribution in the cavity surrounded by ultrasonic phased array, stationary and freely touchable aerial virtual object can be achieved without counting on sensor feedback. We address a method to render pressure distribution to obtain some specific forms. We implemented phased array system mounting about four thousand transducers three-dimensionally. Aerial three dimensional haptic image superimposed on three dimensional optic image are achieved with this device.