Microtuators of SMA for Braille display system

This paper presents a new configuration of microactuator based on the shape memory alloys (SMA) NiTi (Niquel-Titanium), that it can be applied in touch interfaces high resolution. The essentials criterions for the project of a tactile display and factors as time of reply and force mechanics on the Braille display surface had been satisfied. The time was 1s for the displacement of the pin Braille of the order of 0.7 mm, from a current level around 350 mA, and the force for the microactuator was superior 120 mN.