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Novel electrothermal bimorph actuator for large out-of-plane displacement and force

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4 Author(s)
Wei, J. ; Delft Univ. of Technol., Delft ; Duc, T.C. ; Lau, G.K. ; Sarro, P.M.

This paper presents a novel concept and experimental validation of an electrothermal bimorph structure for out-of-plane actuation that exploits the polymer constraint effect. The proposed concept is capable of generating large out-of-plane displacements and forces at a low driving voltage and a low actuation temperature. A downward displacement up to 31 mum is measured at only 5 V driving voltage and 46 mW power consumption. The actuator stiffness is measured to be 75 N/m, thus the corresponding calculated out-of-plane force is 2.3 mN. The maximum actuation temperature during the measurement is 100degC (80degC change). A 25 Hz response frequency is measured by monitoring the resistance change due to the temperature variation.

Published in:

Micro Electro Mechanical Systems, 2008. MEMS 2008. IEEE 21st International Conference on

Date of Conference:

13-17 Jan. 2008