Abstract
In this study, a tactile feeling feedback device for myoelectric prosthetic hand users has been developed, in which the tactile feeling is conveyed to users by vibration. A miniature track ball (MTB) is attached to the fingertip of the myoelectric prosthetic hand and is used as a roughness sensor. Surface roughness is divided into 3 levels, which are rough, middle and smooth. Surface roughness of the object is measured by moving the MTB to a certain direction, and is identified as one of the roughness levels. In accordance with the identified roughness level, magnitude of vibration presenting to the user and presenting time are determined. In addition, direction to present vibration is calculated based on rotated direction of the MTB. The tactile feeling feedback device is mounted on an upper arm of the user, which has 9 vibration motors in cross alignment. Then, the tactile feeling is conveyed through vibration corresponding to the identified roughness by driving the vibration motors to the derived direction in turn. Finally, roughness identification and vibration distinction experiment was carried out to verify an effectiveness of the proposed tactile feeling feedback device.
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