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Light touch on pillar array surface greatly improves direction perception induced by asymmetric vibration
Monday, 02 November
15:45 - 18:00
Kobe Int’l Conference Center, Room 402, Level 4

Light touch on pillar array surface greatly improves direction perception induced by asymmetric vibration

Recent efforts in the field of haptics have established a novel technology for mobile force display which induces an illusory sense of continuous directional pulling force by applying asymmetric vibration to the human skin. To implement this technology into portable or wearable devices for various applications such as lead-by-hand navigation and computer games with force feedback, however, improvement of its energy efficiency is essential. In this study, we focused on states of contact with the force display device to improve its efficiency. Although previous studies have indicated that states of contact including surface texture and grip force significantly influence the cutaneous perception, little efforts have been given to examine how such states could influence the illusory force perception by the asymmetric vibration. We explored this aspect by examining (i) what texture improves the effect of the asymmetric vibration and (ii) how grip force and orientation of the vibration relative to the finger influence the illusory force sensation. We found that pillar array with a diameter of 500 µm and a spatial frequency of 0.4 mm-1 significantly improves the perception of directional force displayed by the vibrating device. Our study further showed that lighter grip force generally results in clearer perception of the displayed force direction while the effect depends on the orientation of the vibration relative to the finger. These results clearly demonstrated the importance of considering contact states for improving the efficiency of mobile force display devices. Our findings would contribute to the miniaturization, weight reduction, and decrease in energy consumption of mobile force display devices. In the workshop, we plan to demonstrate the effect of surface texture on the illusory force sensation caused by asymmetric vibration along with several use case demonstrations of our force display device.


Tetsuhiko Teshima, NTT Communication Science Laboratories
Shinya Takamuku, NTT Communication Science Laboratories
Hiroaki Gomi, NTT Communication Science Laboratories
Tomohiro Amemiya, NTT Communication Science Laboratories

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