Patent ID: 6299462
Filing Date: 2001-10-09
Classification: B81B

Abstract:
A method for forming a MEMS structure comprising the steps of:depositing a first layer of elastic material on a substrate, the elastic material having an inherent stress gradient, the inherent stress gradient biasing the elastic material away from the substrate;photolithographically patterning the layer of elastic material to form at least one spring having a free portion and an anchor portion;depositing a second layer of material on a substrate, which is a non-stressed material having a minimal inherent stress gradient;depositing a hinge on or over a portion of the first layer and a portion of the second layer;configuring a constraint mechanism, such that at least a portion of the second layer is in control of the constraint mechanism;under-cut etching a portion of the substrate under the at least one spring and the second layer to release the free portion of the at least one spring and the second layer from the substrate, and the anchor portion of the at least one spring contact remaining fixed to the substrate, wherein the free portion is biased to move away from the substrate when released until constrained by the constraint mechanism.