2 April 2004 A novel bistable thermally actuated snap-through actuator for out-of-plane deflection
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In this paper , the importance of boundary conditions for two- way bistable thermal snapping action is analysed by Ansys simulations. Several designs are developed and modified into a novel bistable actuator for out of plane deflection. It consists of 4 long epi-silicon single layered legs , a 1200um x 40um x 3um microbeam and 4 spring-supports in which both are polysilicon/oxide/episilicon layered. Buckling of the released structure is achieved by the compressive residual stress remaining in the oxide layer as a result of the processing. The structure switches between two stable equilibrium states by heating the legs and then heating one of the polysilicon layers to produce the thermal moment needed for snapping to occur, hence achieving two-way bistable operation.
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Kevin Yu, Kevin Yu, Aron Michael, Aron Michael, Chee Yee Kwok, Chee Yee Kwok, } "A novel bistable thermally actuated snap-through actuator for out-of-plane deflection", Proc. SPIE 5276, Device and Process Technologies for MEMS, Microelectronics, and Photonics III, (2 April 2004); doi: 10.1117/12.523272; https://doi.org/10.1117/12.523272

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