Patent ID: 9277329
Filing Date: 2016-03-01
CPC Classification: H04R

Claim Text:
1. A MEMS element, comprising: one pressure-sensitive diaphragm including at least one deflectable diaphragm electrode of a capacitor system for signal detection; and one fixed non-pressure-sensitive counter-element including at least one counter-electrode of this capacitor system; wherein at least one electrode of the capacitor system is provided with an electrically charged electret, so that a potential difference exists between the two electrodes of the capacitor system, and wherein the electret includes at least two adjacent layers made from different dielectric materials, electrical charges being stored on their boundary surface; wherein the layer structure of the electrode including the electret includes at least one first electrode layer, at least two dielectric layers and one second electrode layer, wherein the second electrode layer contacts the first electrode layer using a via through the at least two dielectric layers, so that the application of a high voltage between the two electrode layers allows for injecting electrical charges at the boundary surface of the dielectric layers.