Patent ID: 7942501

Claim:
An electrostatic device, comprising a chamber ( 50 ) with at least one opening ( 20 ) on at least one side of the chamber ( 50 ), a flexible membrane ( 200 ) being part of the boundary of the chamber ( 50 ), at least one actuation electrode ( 300 ), at least one moveable electrode ( 500 ), a pressure applicator ( 400 ) coupling the movement of the flexible membrane ( 200 ) and the moveable electrode ( 500 ), and a voltage supply to apply a voltage between the actuation electrode ( 300 ) and the moveable electrode ( 500 ), wherein the moveable electrode is linked by elastic guides with a suspension structure attached to the chamber walls, such that the elastic guides exert a force to pull back the flexible membrane due to the stress in material that the elastic guides are made of.