Demonstration of vibrational Braille code display using large displacement micro-electro-mechanical systems actuators

Junpei Watanabe, Hiroaki Ishikawa, Xavier Arouette, Yasuaki Matsumoto, Norihisa Miki

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

In this paper, we present a vibrational Braille code display with large-displacement micro-electro-mechanical systems (MEMS) actuator arrays. Tactile receptors are more sensitive to vibrational stimuli than to static ones. Therefore, when each cell of the Braille code vibrates at optimal frequencies, subjects can recognize the codes more efficiently. We fabricated a vibrational Braille code display that used actuators consisting of piezoelectric actuators and a hydraulic displacement amplification mechanism (HDAM) as cells. The HDAM that encapsulated incompressible liquids in microchambers with two flexible polymer membranes could amplify the displacement of the MEMS actuator. We investigated the voltage required for subjects to recognize Braille codes when each cell, i.e., the large-displacement MEMS actuator, vibrated at various frequencies. Lower voltages were required at vibration frequencies higher than 50 Hz than at vibration frequencies lower than 50 Hz, which verified that the proposed vibrational Braille code display is efficient by successfully exploiting the characteristics of human tactile receptors.

Original languageEnglish
Article number06FL11
JournalJapanese journal of applied physics
Volume51
Issue number6 PART 2
DOIs
Publication statusPublished - 2012 Jun 1

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ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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