4.6 Article

Design and Experiment Using Flexible Bumps for Piezoelectric-Driven Hydraulically Amplified Braille Dot Display

Journal

MICROMACHINES
Volume 12, Issue 7, Pages -

Publisher

MDPI
DOI: 10.3390/mi12070795

Keywords

piezoelectric drive; Braille display; fluid drive

Funding

  1. National Natural Science Foundation of China [51705031]
  2. Funded Project of Jilin Province Science and Technology Development Plan [20200201063JC]
  3. Scientific Research Project of Jilin Provincial Department of Education [JJKH20210608KJ]

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This study describes the design of a piezoelectric-driven hydraulically amplified Braille-flexible bump device, which enables the flexible formation of Braille characters. Experimental results show that the device meets the touch sensitivity standard for the blind, proving its feasibility and effectiveness.
This paper describes the design of a piezoelectric-driven hydraulically amplified Braille-flexible bump device that enables the flexible formation of Braille characters. A piezoelectric vibrator is used to excite fluid resonance in a cavity, and displacement is realized by compressing the fluid, allowing Braille character dots to be formed. First, the structural design and working principle of the device, as well as the method used to drive the fluid, are explained. Expressions for the output displacement and amplification ratio of the flexible film and piezoelectric vibrator are then obtained through kinetic analysis of the system unit. Subsequently, the structural parameters that affect the output displacement and the liquid amplification are described. Finally, experimental tests of the system are explained. The results indicate that the output displacement of the contact formed by the flexible film reaches 0.214 mm, satisfying the requirements of the touch sensitivity standard for the blind, when the fluid cavity diameter measures 31 mm and the resonance frequency is 375.4 Hz. The corresponding water discharge is 8.8 mL. This study proves that constructing a Braille bump device in this way is both feasible and effective.

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