We have already proposed a novel method to provide human tactile sensation using surface acoustic wave (SAW). A pulse modulated driving voltage excites temporal distribution of standing SAW. The distribution generates friction shift on the surface of a SAW substrate. When the surface with the burst SAW is explored, the friction shift can be perceived as tactile sensation at mechanoreceptors in the finger skin. Controlling the burst frequency according to measured rubbing motion, reality of the displayed sensation can be enhanced. In this research, we proposed a transparent tactile display. An experimental apparatus was fabricated on trial and controlled by using captured images. The apparatus demonstrated potentiality of the tactile display for various applications.
A surface acoustic wave (SAW) linear motor, which is a kind of ultrasonic motors, has many merits such as thin structure, large force, high speed, precise positioning and so on. On the other hand, wear is one of problems in the motor due to friction drive principle. Diamond-like carbon (DLC) films have been recognized as a wear resistant material. In this research, segment structured DLC films are focused to avoid the DLC property of easy damage. Installation of the films to friction surface of the motor is reported. Measurement result of its driving characteristics is also described.
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