The Elastic Inflatable Actuators (EIAs) has several advantages such as the inherent compliance due to the body comprised of a soft materials such as silicone. Among them, the soft fiber reinforced actuator is based on the principle that the expansion of enclosure and constraint of fiber pattern lead to a desired operation. While lots of researches on the actuator has been attributed to linear and bending motions, however, there are only few researches on rotary, or torsional, motions. In this paper, we propose a new actuator that causes azimuthal deformation due to restriction of anisotropically distributed fiber element along the radial direction and expansion of the hyper elastic material. Structure design of the actuator and a fabrication process of the actuator are presented. Subsequently, FEM simulation and experiment are executed to measure rotation angles of the actuators corresponding to the applied pressure.

This paper presents a new subminiature impact type actuator which creates the haptic sensation in a mobile device. Recently, linear resonance actuators (LRA) are widely used. One of the key differences between an LRA and a traditional eccentric motor is that the LRA generates the vibrotactile sensation through resonance for minimizing response time. The strategy of operation near the resonant frequency, however, brought a new issue for creating vibrotactile sensation which can be strong enough to feel in arbitrary frequency. In order to achieve this issue, we adopt an unstable structure to amplify impact force and to reduce response rate. Due to the impact with fast rising and falling time in the proposed impact actuator, the available strong impact vibration is created over wide frequency range from 0Hz to 100Hz. The impact vibration generated from the proposed actuator is suitable for reproducing realistic button sensation and creating various vibration patterns in mobile devices.