Abstract
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.
Highlights
Known as Braille terminals, convert text information from computers into Braille, enabling the blind to interact with computers through tactile human
Is the output a a b figure, Ra is the radius of the flexible film, Rb is the radius of the elastic sheet, Xa is the output displacement of the flexible film, X
A flexible Braille bump device based on piezoelectric-driven liquid amplification has been designed
Summary
Known as Braille terminals, convert text information from computers into Braille, enabling the blind to interact with computers through tactile human–. In order to be able to make up for the above shortcomings and achieve a more environmentally friendly and efficient drive, this paper describes a device that produces a Braille dot display effect using piezo-electric oscillator vibration This vibration excites the liquid in a cavity, generating system resonance and compressing the fluid to drive a flexible film. Piezoelectric-driven Braille displays negative voltages to induce a piezoelectric vibrator to bend and deform, whereby the involve the application of positive and negative voltages to induce a piezoelectric vibrator contact rod fixed on the piezoelectric material moves up or down This motion forms to bend and deform, whereby the contact rod fixed on the piezoelectric material moves bumps or falling cycle switching, producing refreshable Braille characters [15−17]. Braille characters [15,16,17]
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