Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 15, 2008
Patent Application Number
10296977
Date Filed
May 31, 2001
Patent Citations Received
Patent Primary Examiner
Patent abstract
A vibrator for a bone conduction type hearing aid device. The vibrator includes a coil for generating a dynamic magnetic field and two permanent magnets for generating a static magnetic field. The two permanent magnets are working independently from each other in the magnetic circuit and an arranged in such a way that the static and dynamic magnetic fields are substantially separated from each other, but coinciding in the air gaps formed between the coil and magnet arrangement and the casing, whereby the vibrator provides an axial force.
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