Microstereolithography of Three-Dimensional Polymeric Springs for Vibration Energy Harvesting

<table>(left) experimental setup, (right) neodymium-ion-boron rare Earth Magnet(s) on top of the projection microstereoLithography-fabricated HDDA polymer <svg height="11.825" id="M61" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 34.662498 11.825" width="34.662498" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.762)"><path d="M453 211h25l-46 -211h-415v23q97 102 151 166q42 49 81 110q51 78 51 148q0 56 -31.5 91.5t-87.5 35.5q-77 0 -122 -90h-28q67 204 223 204q82 0 132 -49.5t50 -133.5q0 -110 -114 -218l-162 -154h140q82 0 107 13q27 13 46 65z" id="x1D7D0"></path></g><g transform="matrix(.017,-0,0,-.017,12.336,11.762)"><path d="M528 54l-36 -38l-198 201l-198 -201l-36 38l197 200l-197 201l36 38l198 -202l198 202l36 -38l-197 -201z" id="xD7"></path></g><g transform="matrix(.017,-0,0,-.017,26.088,11.762)"><use xlink:href="#x1D7D0"></use></g>
</svg> spring array structure (lower right, VEH with load mass, top right: with 1.236 g load mass and inside the 3000-turn 48 AWG magnet wire coil).</table>

Smart Materials Research

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Figure 4

Figure 4: Microstereolithography of Three-Dimensional Polymeric Springs for Vibration Energy Harvesting 