A hinge device for a flap of a motor vehicle includes a pistoncylinder unit arranged between a fixed structural part and a first flap which is pivotable about an axis of rotation. A composite tetraethyl orthosilicate-silicon nitride layer is deposited over the floating gate and anisotropically etched to form the MLS. The green compact is molded by the application of a molding force of not lower than 65 tons and the binder has a particle size smaller than 40 \u03bcm. The discontinuity is recorded and converted into an optical signal that is transmitted wirelessly to a processing unit at a receiving station. Additionally, the subregion may comprise at least one slot.