Patent ID: 6355578
Filing Date: 2002-03-12
Classification: B81B

Abstract:
A manufacturing method for a composite device, comprising the steps of:forming a structural layer over a substrate separated by a sacrificial layer wherein movable parts are formed by portions of the structural layer where the sacrifice layer underneath the bottom face is completely removed, and fixed parts being formed in portions of the structural layer where the sacrifice layer underneath the structural layer remains; forming electrical elements within the structural layer; forming a thin metallic film over at least portions of the structural layer; patterning a mask film over portions of the thin metallic film and removing portions of the thin metallic film that leaves remaining portions of the thin metallic film which at least includes an electrode for an external connection over the structural layer; patterning a second mask film over at least portions of the electrode and etching the structural layer to expose the sacrifice layer using the second mask film; and removing portions of the sacrifice layer at the bottom of the structural layer by side etching to form the moveable portions.