压电驱动柔性盲文点显装置实验研究

Experimental Study on Piezoelectric Driven Flexible Braille Display Device

设计了一种基于压电驱动的柔性盲文点显装置,该装置利用压电振子振动激励腔内流体发生共振,压缩流体实现位移驱动能力,形成盲文字符点。首先对装置结构设计和工作原理进行了说明,特别强调了惯性驱动器和流体腔内结构和工作原理;然后对系统装置进行实验测试,分析了流体腔直径、高度、配重块、悬臂长度及宽度等因素对系统显示效果的影响。结果表明,流体腔直径为31 mm,高度为8 mm,配重质量块11.75 g,悬臂长度为79 mm,共振频率为350 Hz,柔性薄膜形成触点输出位移为0.214 mm。在振动动态刺激的作用下,手指能够明显感受到有字符凸点。满足盲人触摸敏感标准的要求。验证了用此种方法构造盲文触点装置是可行有效的,对盲文识别文字装置设计供了借鉴和参考。

In this paper,a flexible Braille dot display device based on piezoelectric actuator is designed.The device uses the vibration of piezoelectric vibrator to excite the fluid in the cavity to generate resonance,compress the fluid to achieve displacement driving ability and form Braille character dots.Firstly,the structural design and working principle of the device are described,especially the structure and working principle of the inertial actuator and fluid chamber are emphasized;then,experimental test of the system device is carried out,and the influence of the fluid chamber diameter,height,counterweight,cantilever length and width on the display effect of the system is also analyzed.The results show that the diameter of the fluid chamber is 31 mm,the height is 8 mm,the counterweight mass is 11.75 g,the cantilever length is 79 mm,the resonance frequency is 350 Hz,and the output displacement of the flexible film contact is 0.214 mm.Under the action of vibration dynamic stimulation,finger can obviously feel the character bump.It meets the requirements of touch sensitivity standard for blind people.It is proved that this method is feasible and effective to construct Braille contact device,which provides reference for Braille recognition device.