Patent ID: 8008105

Claim:
A method for fabricating a micro-electro-mechanical device having a movable mechanical part to transform energy, the method comprising the steps of: providing a substrate wafer, a middle spring layer and a top plate layer; forming at least one cavity on either a front side of a substrate wafer or a bottom side of the middle spring layer by directly patterning into the said side or by patterning a sacrificial layer added onto the said side, wherein each cavity has at least one sidewall; forming at least one connector of a desired height on either a top side of a middle spring layer or a bottom side of a top plate layer; and joining the substrate wafer, the middle spring layer and the top plate layer such that the bottom side of the top plate layer faces the top side of the middle spring layer and a bottom side of the middle spring layer faces the front side of the substrate wafer, whereby the connector stands out from the middle spring layer to define a transducing space between the top plate layer and the middle spring layer, and the connector is horizontally distanced from the sidewall by a sufficient length to define a cantilever anchored at the sidewall with an exerting end at the connector, wherein the cantilever and the cavity enable a vertical displacement of the connector to transport the top plate layer substantially vertically with a piston-like motion to change the transducing space, and wherein, when so joined, the top plate layer is adapted for receiving and/or transmitting energy.