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Proceedings Paper

Tactile refreshable screen based on magneto-rheological fluids for map exploration and navigation tasks
Author(s): C. Bolzmacher; G. Changeon; V. Plaud; S. Roselier; J. Lozada; M. Hafez
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Paper Abstract

Human-machine interfaces can convey information via visual, audio and/or haptic cues during a navigation task. The visual and audio technologies are mature, whereas research has to be focused on haptic technologies for mobile devices. In this work, a tactile refreshable screen is proposed which allows its user the exploration of maps and navigational tasks in an egocentric perspective. The proposed device consists of an array of actuators which can display various patterns. The actuation technology is based on a magneto-rheological fluid which is injected in a chamber with an elastomeric membrane using a micro pump. The fluid pressure deforms the membrane in order to display a pattern. The fluid properties are used to form a valve in each cell. A permanent magnet, a ferromagnetic core, and a coil form a closed magnetic circuit with a gap where the magneto-rheological fluid can flow; the magnetic field interacts with the fluid and prevents the filling or draining of the chamber. Applying a current to the coil counteracts the magnetic field generated by the magnet and the fluid can circulate freely in order to inflate or deflate the membrane. The design, fabrication and integration of the device in addition to the results of finite element simulations and experimental measurements are reported.

Paper Details

Date Published: 5 May 2011
PDF: 10 pages
Proc. SPIE 8066, Smart Sensors, Actuators, and MEMS V, 80661T (5 May 2011); doi: 10.1117/12.886982
Show Author Affiliations
C. Bolzmacher, CEA LIST (France)
G. Changeon, CEA LIST (France)
V. Plaud, CEA LIST (France)
S. Roselier, CEA LIST (France)
J. Lozada, CEA LIST (France)
M. Hafez, CEA LIST (France)

Published in SPIE Proceedings Vol. 8066:
Smart Sensors, Actuators, and MEMS V
Ulrich Schmid; José Luis Sánchez-Rojas; Monika Leester-Schaedel, Editor(s)

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