Patent ID: 7376237

Claim:
A vibrator system for generating bone conduction vibrations, comprising: a housing having a magnet in a wall thereof and a vibrator disposed therein, the magnet providing a static magnetic flux (Φ 1 ) following a first path; a bobbin being centered in the vibrator; the housing enclosing the bobbin, the housing having a coil wound around a center portions of the bobbin, the coil being powered by an alternating current for providing an alternating dynamic magnetic flux (Φ 2 ) substantially following the first path through a magnetic circuit; the housing having an upper end, the upper end and the bobbin having a first gap formed therebetween; the housing having a lower end opposite the upper end, the lower end and the bobbin having a second gap formed therebetween; the static magnetic flux (Φ 1 ) is passing through the first and second gaps in a direction substantially parallel with an axial direction (A) of the vibrator; the static magnetic flux (Φ 1 ) is not passing through any other gaps than the first and second gaps; and suspension means for suspending the bobbin in a centered position inside the housing.