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A compact 2-DOF (two degrees of freedom) piezoelectric-driven platform for 3D cellular bio-assembly systems has been proposed based on "Z-shaped" flexure hinges. Multiple linear motions with high resolution both in x and y directions are achieved. The "Z-shaped" flexure hinges and the parallel-six-connecting-rods structure are utilized to obtain the lowest working stress while compared with other types of flexure hinges. In order to achieve the optimized structure, matrix-based compliance modeling (MCM) method and finite element method (FEM) are used to evaluate both the static and dynamic performances of the proposed 2-DOF piezoelectric-driven platform. Experimental results indicate that the maximum motion displacements for x -stage and y -stage are l  x = 17.65 μm and l  y = 15.45 μm, respectively. The step response time for x -stage and y -stage are t  x = 1.7 ms and t  y = 1.6 ms, respectively.

A Compact 2-DOF Piezoelectric-Driven Platform Based on “Z-Shaped” Flexure Hinges