Impact sensor for identifying an impact or any other acceleration

An impact sensor for detection of an impact or of any other acceleration, wherein the impact sensor contains a liquid in the form of a droplet or of any other liquid reservoir and is designed such that a position and/or distribution of the liquid in the impact sensor indicates whether the impact sensor has been exposed to an impact or to any other acceleration of a predetermined minimum magnitude,

• wherein the impact sensor is provided with a layer composite that comprises at least the following:
• a first foil,
• a second foil,
• at least one cavity, slot or other recess disposed between a foil face of the first foil and a foil face of the second foil and
• at least one retaining structure, which is disposed on the foil face of the first and/or second foil,
• wherein the at least one retaining structure is designed to
• maintain the liquid in a predetermined first sub-volume of the cavity in contact with both the first and second foils as long as the impact sensor is sensitive for impacts or other accelerations of predetermined minimum magnitude, and further is designed to permit an escape of the liquid or a part of the liquid from the first sub-volume into a second sub-volume of the cavity that functions for collection of the liquid only in the event of an impact or of any other acceleration above the predetermined minimum magnitude,
• wherein the at least one retaining structure is a region of the first and/or second foil that is formed as a local elevation, depression or as any other local irregularity of the foil face of the first and/or second foil, and wherein the local elevation, depression or other local irregularity
• forms a passable barrier for a wetting and/or contacting of the first and/or second foil by the liquid and
• an area piece of the foil face of the first and/or second foil, which corresponds to the first sub-volume, defines the first and/or second foil.