Electro-magnetic transducer and vibration control system

Abstract

An electromagnetic transducer is disclosed including a ring magnetic assembly, a first coil disposed in the magnetic field generated by the magnetic assembly, such that the first coil reciprocally moves with respect to the magnetic assembly, at least one elastic suspension-connecting the magnetic assembly to the first coil to allow for reciprocal movement between the first coil and the magnetic assembly, a control coil connected to the magnetic assembly by an elastic suspension to allow for reciprocal movement of the control coil with respect to the magnetic assembly, a vibrating surface connected to the first coil or the magnetic assembly or the control coil in order to vibrate, and an electronic control to control an excitation current of the control coil in order to generate a mechanical force adapted to control the mechanical vibration of the vibrating surface.

Dependencies are inferred from the claim text.