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Tactile Stimulation by Repetitive Lateral Movement of Midair Ultrasound Focus

Published: 01 April 2020 Publication History

Abstract

We report a new vibrotactile modulation method of midair ultrasound focus, namely, lateral modulation (LM), in which the focus quickly moves along a small cyclic trajectory and provides stronger and clearer vibrotactile stimuli than those by the conventional amplitude modulation (AM) method. Midair ultrasound haptics has an essential technical advantage of offering remote, non-contact, and pinpoint tactile stimuli on device-free bare skin. On the other hand, lack of clarity in the presented vibrotactile sensation has often been pointed out, and until now, an AM focus has been valid only on glabrous skin. Our main scientific contribution of the article is to verify the LM method, with the following experimental findings newly obtained. We confirmed that with the same maximum output amplitude of the ultrasound phased arrays, LM stimuli with circular focal trajectories were sensed stronger than AM stimuli by glabrous skin and hairy skin in a modulation frequency of 10-200 Hz. We also found that the detection threshold in glabrous skin mainly depended on the focal speed, whereas the tendency in hairy skin was different from that. With these results, we discuss a basis of perceptional mechanism that responds to LM stimuli, along with practical aspects of potential applications.

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        cover image IEEE Transactions on Haptics
        IEEE Transactions on Haptics  Volume 13, Issue 2
        April-June 2020
        189 pages

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        IEEE Computer Society Press

        Washington, DC, United States

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        Published: 01 April 2020

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        • (2024)Ultrasonic Mid-Air Haptics on the Face: Effects of Lateral Modulation Frequency and Amplitude on Users’ ResponsesProceedings of the 2024 CHI Conference on Human Factors in Computing Systems10.1145/3613904.3642417(1-12)Online publication date: 11-May-2024
        • (2024)Local Area Tactile Stimulation Using Interference of Multi-Frequency Airborne UltrasoundIEEE Transactions on Haptics10.1109/TOH.2024.341633317:4(761-770)Online publication date: 1-Oct-2024
        • (2024)Spatiotemporal Modulation for Ultrasonic Mid-Air Haptics: Sensation's Specification and ValidationIEEE Transactions on Haptics10.1109/TOH.2024.335518717:3(429-440)Online publication date: 1-Jul-2024
        • (2024)Noncontact Haptic Rendering of Static Contact With Convex Surface Using Circular Movement of Ultrasound Focus on a Finger PadIEEE Transactions on Haptics10.1109/TOH.2023.333823017:3(334-345)Online publication date: 1-Jul-2024
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