On a touch surface, providing a local vibrotactile feedback enables multiuser and multitouch interactions. While the vibration propagation usually impedes this localization, we show in this article that narrow strip-shaped plates constitute waveguides in which bending waves below a cut-off frequency do not propagate. We provide a theoretical explanation of the phenomenon and experimental validations. We thus show that vibrations up to a few kHz are well confined on top of the actuated area with vibration amplitude over 1 micrometer. The principle was validated with piezoelectric actuators of various shapes and a linear resonant actuator (LRA). Investigation of the effect of a fingertip load on the system through theory and experimentation was conducted and revealed that almost no attenuation was brought by the fingertip when using low frequency evanescent waves. Finally, a perceptual validation was conducted and showed dynamic stimuli with a large frequency spectrum could be felt and distinguished.

中文翻译：

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窄板中振动触觉刺激的限制：手指负载的原理和效果


在触摸表面上，提供本地振动触觉反馈可实现多用户和多点触控交互。虽然振动传播通常会阻碍这种定位，但我们在本文中表明，窄条形板构成波导，其中低于截止频率的弯曲波不会传播。我们提供了该现象的理论解释和实验验证。因此，我们表明，高达几 kHz 的振动被很好地限制在振动幅度超过 1 微米的驱动区域顶部。该原理通过各种形状的压电执行器和线性谐振执行器（LRA）进行了验证。通过理论和实验研究了指尖负载对系统的影响，结果表明，使用低频倏逝波时，指尖几乎没有带来任何衰减。最后，进行了感知验证，结果表明可以感知和区分大频谱的动态刺激。