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282                                                         Chapter 5
         central plate and, due to the eccentric nature of these forces, the central plate
         will rotate with respect to the hinge longitudinal axis.














                 Figure 5.16  Model for  mass and two suspensions with torsion loading











































           Figure 5.17  Torsion  micromirror. (a) Top view schematic; (b) Detail with rotated plate

             When the two  torques are  in equilibrium, the  angle of rotation can  be
         found by  means of  Eq.  (5.45). Another  important  aspect is  the  pull-in
         phenomenon, which has been discussed in this chapter and which defines the
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