Patent ID: RE44246

Claim:
A method of enclosing a micromechanical element formed between a base layer and one or more metallization layers comprising: forming a first encapsulating layer over at least part of the micromechanical element; depositing a second encapsulating layer over the first encapsulating layer and providing an encapsulating wall surrounding the micromechanical element to form a lateral sealing wall extending between the base layer and the one or more encapsulating layers; depositing the one or more metallization layers over the first encapsulating layer; providing electrical connection between the base layer and the one or more metallization layers formed above the micromechanical element; etching through the first encapsulating layer and a sacrificial layer disposed therebelow to form an opening through the first encapsulating layer and the sacrificial layer; introducing an etching agent through the opening; and removing the sacrificial layer, wherein the micromechanical element is disposed in a cavity that is at least partially bordered by the encapsulating wall.