A Refreshable Braille Cell Based on Pneumatic Microbubble Actuators
A Refreshable Braille Cell Based on Pneumatic Microbubble Actuators
复制标题
基于气动微泡执行器的可刷新盲文单元
DOI：
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发表时间：
2012
影响因子：
2.7
通讯作者：
M. Allen
中科院分区：
文献类型：
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作者：
Xiaosong Wu;Seong;Haihong Zhu;C. Ji;M. Allen
基于2 × 3气动微泡致动器阵列和商业阀门阵列，开发了一种可刷新的盲文单元作为触觉显示原型。作为盲文点的微泡致动器由聚对二甲苯波纹膜片和外涂层弹性体层组成。以聚氨酯（PU）和聚二甲基硅氧烷（PDMS）为填充材料，制备了盲文电池，并对其位移-压力特性、力-位移特性、动态响应和弹性变形滞后特性进行了比较。PU和PDMS为基础的气动盲文细胞表现出令人满意的性能对静态和振动触觉显示的要求。基于PU的盲文点的位移在0.2Hz的操作频率下为0.56 mm，并且在100 kPa的施加压力下产生的力为66 mN。在用PU弹性体制成的微泡致动器中观察到的强滞后通过使用PDMS弹性体解决。可刷新盲文单元的设计也符合轻便和紧凑的标准，允许便携式操作。该设计相对于触觉致动器的数量是可缩放的，同时保持制造简单性。
A refreshable Braille cell as a tactile display prototype has been developed based on a 2 x 3 pneumatic microbubble actuator array and an array of commercial valves. The microbubble actuator acting as a Braille dot consists of a parylene corrugated diaphragm and an overcoated elastomer layer. Polyurethane (PU) and polydimethylsiloxane (PDMS) elastomer-based Braille cells were fabricated and compared in terms of their displacement-pressure characteristics, force-displacement characteristics, dynamic response, and hysteresis of elastic deformation. Both PU- and PDMS-based pneumatic Braille cells demonstrate satisfactory properties against the static and vibrational tactile display requirements. The displacement of the PU-based Braille dot is 0.56 mm at a 0.2-Hz operating frequency, and the generated force is 66 mN at a 100-kPa applied pressure. The strong hysteresis observed in microbubble actuators made with PU elastomer is resolved by the use of PDMS elastomer. The refreshable Braille cell was also designed to meet the criteria of lightness and compactness to permit portable operation. The design is scalable with respect to the number of tactile actuators while maintaining fabrication simplicity.