Patent ID: 8316715

Claim:
A vibration sensor comprising: (a) a carrying element capable of being set into vibration; (b) a conversion device having a field coil to set said carrying element into vibration and/or to tap a vibration of said carrying element; (c) an anchor mounted in said field coil; (d) a vibration element to transmit said vibration from said carrying element into a surrounding space and/or from said surrounding space to said carrying element; and, characterized by: (i) said anchor being constructed in two pieces, said two pieces comprising a permanent magnet and a coil core connected to said field coil; (ii) an air gap arranged between said permanent magnet and said coil core lying in the area of the axial extension of said field coil; (iii) said permanent magnet being connected to said carrying element for the transmission of said vibration; and (iv) said field coil and said permanent magnet being arranged to interact in such a way that said vibration of said permanent magnet will induce a current flow in said field coil and/or that a current flow inducing a magnet field will effect a vibration of the permanent magnet in said field coil.