Abstract
In this work, we present the design and experimental analysis of a novel mechanism for a refreshable braille display (RBD). It implements a single actuated slider for refreshing braille cells composed of simple and passive ferromagnetic pins. The approach potentially decouples the cost of the final device from the number of braille cells and pins. In this work, we present the rationale of the actuating method and a design solution implemented in a working prototype of the mechanism. Experimental characterization supported by FEM analysis provided a clearer view of the interacting forces and dynamics of the tactile pins refreshing cycle, and allowed to improve calibration and performance with respect to previous preliminary results. Such knowledge can be transferred to full-size refreshable braille display prototypes. A final cost and scalability analysis, and comparison with conventional RBDs devices highlights limits and potentials of the proposed method, in particular for implementation of large RBDs and tactile matrices.
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References
Aph american printing house for the blind—orbit reader 20. In: https://www.aph.org/research/orbit-reader-20-details/
Bristol braille technology—canute. In: http://www.bristolbraille.co.uk/
Benali-Khoudja M, Hafez M, Alexandre JM, Kheddar A (2004) Tactile interfaces: a state-of-the-art survey. Int Symp Robot 31:23–26
Besse N, Rosset S, Zárate JJ, Ferrari E, Brayda L, Shea H (2018) Understanding graphics on a scalable latching assistive haptic display using a shape memory polymer membrane. IEEE Trans Haptics 11(1):30–38
Bochereau S, Sinclair S, Hayward V (2015) Looking for physical invariants in the mechanical response of a tactually scanned braille dot. In: World haptics conference (WHC), 2015 IEEE, pp 119–124
Brayda L, Leo F, Baccelliere C, Ferrari E, Vigini C (2018) Updated tactile feedback with a pin array matrix helps blind people to reduce self-location errors. Micromachines 9(7):351
Frediani G, Busfield J, Carpi F (2018) Enabling portable multiple-line refreshable braille displays with electroactive elastomers. Med Eng Phys 60:86–93
Innovision: Braille me. In: http://innovisiontech.co/brailleme/
Karpelson M, Peña R, Wood RJ (2018) Low-cost electromechanical actuator arrays for tactile display applications. In: 2018 IEEE international conference on robotics and automation (ICRA), IEEE, pp 471–476
Leonardis D, Claudio L, Frisoli A (2017) A survey on innovative refreshable braille display technologies. In: International conference on applied human factors and ergonomics, Springer, pp 488–498
Leonardis D, Loconsole C (2018) Braille cursor: An innovative and affordable refreshable braille display designed for inclusion. In: International conference on applied human factors and ergonomics, Springer, pp 302–311
Loconsole C, Leonardis D, Gabardi M, Frisoli A (2019) Braillecursor: an innovative refreshable braille display based on a single sliding actuator and simple passive pins. In: 2019 IEEE world haptics conference (WHC), IEEE, pp 139–144
Meeker D (2010) Finite element method magnetics. FEMM 4:32
Metec-Ingenieur-AG: Hyperbraille. In: https://web.metec-ag.de/en/produkte-graphik-display.php
Metec-Ingenieur-AG: P20 braille module. In: https://www.metec-ag.de/produkte-braille-module.php?p=p20
Packard HH, Multi jet fusion 3d printing technology. In: https://www8.hp.com/it/it/printers/3d-printers/products/multi-jet-technology.html
Roberts J, Slattery O, Kardos D (2000) 49.2: Rotating-wheel braille display for continuous refreshable braille. In: SID symposium digest of technical papers, Wiley Online Library, vol 31, pp 1130–1133
Russomanno A, O’Modhrain S, Gillespie RB, Rodger MW (2015) Refreshing refreshable braille displays. IEEE Trans Haptics 8(3):287–297
Sîrbu ID, Moretti G, Dirè S, Fambri L, Vertechy R, Meniglio D, Fontana M (2019) Electrostatic actuator for tactile display based on hydraulically coupled dielectric fluids and soft structures. In: Electroactive polymer actuators and devices (EAPAD) XXI, International Society for Optics and Photonics, vol 10966, p 109662D
Vidal-Verdú F, Hafez M (2007) Graphical tactile displays for visually-impaired people. IEEE Trans Neural Syst Rehabil Eng 15(1):119–130
Völkel T, Weber G, Baumann U (2008) Tactile graphics revised: the novel brailledis 9000 pin-matrix device with multitouch input. In: International conference on computers for handicapped persons, Springer, pp 835–842
Zhang K, Follmer S (2018) Electrostatic adhesive brakes for high spatial resolution refreshable 2.5 d tactile shape displays. In: Haptics symposium (HAPTICS), 2018 IEEE, pp 319–326
Funding
This study was funded by the Italian Ministry of Education, University and Research (MIUR) within the Smart Cities and Communities and Social Innovation program, Braille Lab research Project (code SIN 00190). Authors Daniele Leonardis and Claudio Loconsole received research Grants within the above Project funding.
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Leonardis, D., Loconsole, C. & Frisoli, A. A passive and scalable magnetic mechanism for braille cursor, an innovative refreshable braille display. Meccanica 55, 1639–1653 (2020). https://doi.org/10.1007/s11012-020-01190-6
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DOI: https://doi.org/10.1007/s11012-020-01190-6