Touching force response of the piezoelectric Braille cell

Smithmaitrie, Pruittikorn; Kanjantoe, Jinda; Tandayya, Pichaya

doi:10.1080/17483100802281442

Cited by 17 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is the time during which a user can easily feel the certain sequences of one vibrating pattern enough number of times in order to detect and distinguish it from other patterns. This result is taken from [10] which resulted that settling time response of the beam tip of the piezoelectric bimorph is around 150 to 170 milliseconds. To be on the safe side we used the delay up value of 200ms for each sequence of vibrating patterns.…”

Section: Tactile Pattern Typesmentioning

confidence: 99%

Exploring the Impulsion and Vibration Effects of Tactile Patterns

Tahir

Bailly

Lecolinet

2008

Electronic Workshops in Computing

View full text Add to dashboard Cite

This paper explores the impulsion and vibration properties of different tactile patterns. These properties describe the unique states of the pins for example raised or lowered. The tactile feedback is provided by Braille pins on a finger and is in the form of different patterns chosen for the experiments. We tested these features on the Braille display of dimension 4x2 (8 pins). The experiments were conducted to determine the selection time and error rate of impulsion and vibration characteristics. We report preliminary results of informal tests. We also discuss the related issues and propose possible future directions.

show abstract

Section: Tactile Pattern Typesmentioning

confidence: 99%

Exploring the Impulsion and Vibration Effects of Tactile Patterns

Tahir

Bailly

Lecolinet

2008

Electronic Workshops in Computing

View full text Add to dashboard Cite

show abstract

“…In the 1990s, the first braille displaysbased on piezoelectric actuatorsappeared. ,− They allow dynamically displaying 20–80 braille characters. Nevertheless, the small deformation ratio of a piezoelectric material imposes the use of a large quantity of material.…”

Section: Introductionmentioning

confidence: 99%

Development of a Soft Actuator from Fast Swelling Macroporous PNIPAM Gels for Smart Braille Device Applications in Haptic Technology

Yilmaz

Chaabane

Mansard

2023

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

The development of a cost-efficient braille device is a crucial challenge in haptic technology to improve the integration of visually impaired people. Exclusion of any group threatens the proper functioning of society. Commercially available braille devices still utilize piezoelectric actuators, which are expensive and bulky. The challenge of a more adapted braille device lies in the integration of a high number of actuatorson a millimeter scalein order to independently move a matrix of pins acting as tactile cues. Unfortunately, no actuation strategy has been adapted to tackle this challenge. In this study, we develop a soft actuator based on a thermosensitive poly(N-isopropylacrylamide) (PNIPAM) gel. We introduce macroporosity to the gel (pores of 10 to 100 μm). It overcomes the diffusionwhich is the limiting kinetic factorand accelerates the gel response time from hours for the bulk gel to seconds for the macroporous gel. We study the properties of porous gels with various porosities. We also compare a mechanically reinforced nanocomposite gel (made of PNIPAM and Laponite clay) to a “classic” gel. As a result, we develop a fast-actuating gel with high cyclic performance. We then develop a single-pin braille setup, where actuation is controlled thanks to a swift temperature control of a macroporous gel cylinder. This new strategy offers a very promising actuation technology. It offers a simple and cost-efficient alternative to the current braille devices.

show abstract

“…This mechanical deformation is used to raise the pins up and down to form Braille characters. Actually it is very fast but when used for multi line Braille display it becomes bulky and too costly (11) .…”

Section: Introductionmentioning

confidence: 99%

An innovative idea for low cost Braille e-reader

Kavitha¹

2020

IJST

View full text Add to dashboard Cite

Background/Objectives: The aim of this study was to implement the rotating cubes for designing the Braillerefreshable display. The rotating cube Braille display has many benefits i.e., compact size, low cost etc. Methods/Statistical analysis: refreshable Braille display is an electro mechanical device which forms Braille charactersby raising pins through holes on flat surface. The raising of such pins is accomplished by complex and costly systems like solenoids or piezo-electric crystals or EAP (Electro Active Polimer). We developed the prototype of e-book reader, which is a low cost electro mechanical system aimed at assisting visually impaired to access the e-books. Findings: Many design concepts were proposed earlier and prototypes were built, and were tested successfully in thepast by using three simple rotating cubes. The main parameters like dot spacing, overall dimension, touching force and operating voltage obtained are discussed. Dot spacing 2.5 [mm] with reference to International standard has been maintained. Regarding overall dimension, the display unit is designed to have dimension of 120mm width to 150mm height adhering to NLS standard of Braille dot spacing, and the tactile surface will feature 13 lines with 14 characters per line. The touching force of 0.32N and operating voltage below 25 V was obtained and used. Novelty/Applications: The Solenoid is used for positioning the faces of individual cubes, which can be arranged in different positions thereby forming all Braille characters. The high power consumption which remained the major head ache in solenoid electromagnetic actuator models was a major challenge we faced initially, which we overcame with our unique innovative design combining cubes that can rotate to form Braille dots and electromagnetic actuator which can be positioned at various places to run this cubes. So Keeping Occam's Razor Principle in mind, we went ahead to design a multicell/multi-line electronic refreshable Braille display as a technology demonstrator by using three simple rotating cubes.

show abstract

Touching force response of the piezoelectric Braille cell

Cited by 17 publications

References 11 publications

Exploring the Impulsion and Vibration Effects of Tactile Patterns

Exploring the Impulsion and Vibration Effects of Tactile Patterns

Development of a Soft Actuator from Fast Swelling Macroporous PNIPAM Gels for Smart Braille Device Applications in Haptic Technology

An innovative idea for low cost Braille e-reader

Contact Info

Product

Resources

About