Abstract
We have been researching a portable obstacle recognition support device to avoid danger for users and surrounding people. We have confirmed that perception of vibration is changed by user's grip force, the stronger grip force, the stronger user feel vibration. In addition, experimental result showed that the vibrations strength users feel changes with the vibration strength which is applied earlier to users. It's thought that this result is a phenomenon which is based on adaptability of sense of touch and pressure. We aim at warning design without recourse to adaptability.
