Patent ID: 8623686

Claim:
A method of manufacturing a microelectromechanical device, the method comprising: forming a micromachined mechanical structure on top of a substrate; providing a sacrificial layer over the micromachined mechanical structure; disposing a first encapsulation layer over at least a portion of the sacrificial layer, at least a portion of the micromachined mechanical structure, and at least a portion of the substrate; forming a plurality of vents in the first encapsulation layer; removing the sacrificial layer through the plurality of vents to release at least a portion of the micromachined mechanical structure, thereby forming a chamber, wherein: a surface of the first encapsulation layer forms a wall of the chamber, at least a portion of the micromachined mechanical structure is disposed in the chamber, and after the sacrificial layer is removed, no intervening layers reside between the micromachined mechanical structure and the first encapsulation layer; and disposing a second encapsulation layer over the first encapsulation layer to fill the plurality of vents, thereby sealing the chamber, wherein: no intervening layers reside between the first encapsulation layer and the second encapsulation layer, and the first encapsulation layer and the second encapsulation layer comprise the same material.