Tactile display of softness on fingertip.
Tactile display of softness on fingertip.
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DOI：
10.1038/s41598-020-77591-0
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发表时间：
2020-11-24
影响因子：
4.6
通讯作者：
Carpi F
中科院分区：
文献类型：
--
作者：
Frediani G;Carpi F
多感官人机界面目前面临着挑战，因为缺乏有效、舒适和负担得起的驱动技术，用于在虚拟或增强现实环境中显示可穿戴的触觉柔软度。它们应该为指尖提供触觉反馈，模拟触摸柔软物体时感受到的触觉感觉，用于基于虚拟现实的训练、远程康复、远程操纵、远程呈现等应用。在指尖上显示虚拟柔软度需要通过可变形表面施加准静态(非振动)力，以控制皮肤的接触面积和凹陷深度。现有技术没有提供结构简单、重量轻、尺寸小和电气安全操作相结合的可穿戴设备。因此，现实生活中仍缺少可穿戴式柔软度显示器。在这里，我们介绍了一种基于指尖安装的小型可变形腔的技术，这些腔重约3克，由紧凑且经济实惠的单元气动驱动。该驱动单元重量不到400克，便于携带，可以通过数字控制独立刺激多达三个指尖。心理物理测试证明了产生有用感知的能力，韦伯常数为0.15，这是一个刚刚明显的差异。该系统由现成的材料和部件组成，没有任何特殊的制造工艺，并已完全公开，提供了原理图和部件清单。这样做的目的是让它变得容易和自由使用，从而将指尖上柔软的触觉展示转化为一项技术。
Multi-sensory human–machine interfaces are currently challenged by the lack of effective, comfortable and affordable actuation technologies for wearable tactile displays of softness in virtual- or augmented-reality environments. They should provide fingertips with tactile feedback mimicking the tactual feeling perceived while touching soft objects, for applications like virtual reality-based training, tele-rehabilitation, tele-manipulation, tele-presence, etc. Displaying a virtual softness on a fingertip requires the application of quasi-static (non-vibratory) forces via a deformable surface, to control both the contact area and the indentation depth of the skin. The state of the art does not offer wearable devices that can combine simple structure, low weight, low size and electrically safe operation. As a result, wearable softness displays are still missing for real-life uses. Here, we present a technology based on fingertip-mounted small deformable chambers, which weight about 3 g and are pneumatically driven by a compact and cost-effective unit. Weighting less than 400 g, the driving unit is easily portable and can be digitally controlled to stimulate up to three fingertips independently. Psychophysical tests proved ability to generate useful perceptions, with a Just Noticeable Difference characterised by a Weber constant of 0.15. The system was made of off-the-shelf materials and components, without any special manufacturing process, and is fully disclosed, providing schematics and lists of components. This was aimed at making it easily and freely usable, so as to turn tactile displays of softness on fingertips into a technology ‘at fingertips’.
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