Patent ID: 6426582
Filing Date: 2002-07-30
Classification: B06B,B81B

Abstract:
A micromechanical, capacitative ultrasound transducer comprising:a cooperating electrode and a substrate, the cooperating electrode being disposed on the substrate, the cooperating electrode having a central region, a spacer layer disposed on the substrate and/or on the cooperating electrode, the spacer layer and at least one recess disposed over the central region of the cooperating electrode, the transducer further comprising a micromechanical membrane disposed on top of the spacer layer and covering the recess thereof, the micromechanical membrane having a first side facing towards the cooperating electrode, the first side comprising a plurality of nubs, the micromechanical membrane being held down by a photoresist layer or by an electrically applied force, so that the nubs of the first side of the micromechanical membrane engage the cooperating electrode.