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Electrothermal Actuators for Portable Braille Devices

Hatzfeld, Christian and El Khoury, Mario and Nakic, Christian and Staab, Matthias and Winterstein, Thomas and Schlaak, Helmut F. (2016):
Electrothermal Actuators for Portable Braille Devices.
In: Eurohaptics 2016 - Work in Progress, [Conference or Workshop Item]

Abstract

The development of large-scale matrix-displays with raised pins in Braille con guration is a widely researched eld in academia and industry. Piezoelectric actuation principles can be used to manufacture such devices at high costs, but several other actuation principles are investigated in search for a low-cost, mobile realization. In this work, we present electrothermal actuators as a possible solution. These actuators are based on thermal expansion of polymeric materials, that can be batch-processed with established micro-manufacturing methods. The combination of two actuators per Braille pin yields a bistable device with no energy consumption for static information display. It exhibits a maximum de ection of 60 µm when resisting a pushing force of 100mN, such assuring readability of Braille text. Current device fabrication is compatible with standard PCB processes, precision machining is investigated as possible low-cost alternative. Major drawback of the device are switching times of a few seconds that restrict the usefulness for high information refreshing rates.

Item Type: Conference or Workshop Item
Erschienen: 2016
Creators: Hatzfeld, Christian and El Khoury, Mario and Nakic, Christian and Staab, Matthias and Winterstein, Thomas and Schlaak, Helmut F.
Title: Electrothermal Actuators for Portable Braille Devices
Language: English
Abstract:

The development of large-scale matrix-displays with raised pins in Braille con guration is a widely researched eld in academia and industry. Piezoelectric actuation principles can be used to manufacture such devices at high costs, but several other actuation principles are investigated in search for a low-cost, mobile realization. In this work, we present electrothermal actuators as a possible solution. These actuators are based on thermal expansion of polymeric materials, that can be batch-processed with established micro-manufacturing methods. The combination of two actuators per Braille pin yields a bistable device with no energy consumption for static information display. It exhibits a maximum de ection of 60 µm when resisting a pushing force of 100mN, such assuring readability of Braille text. Current device fabrication is compatible with standard PCB processes, precision machining is investigated as possible low-cost alternative. Major drawback of the device are switching times of a few seconds that restrict the usefulness for high information refreshing rates.

Divisions: 18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Microtechnology and Electromechanical Systems
18 Department of Electrical Engineering and Information Technology > Institute for Electromechanical Design > Measurement and Sensor Technology
18 Department of Electrical Engineering and Information Technology
Event Title: Eurohaptics 2016 - Work in Progress
Date Deposited: 02 Aug 2016 08:19
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