Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Reexamination Certificate
2008-01-15
2008-01-15
Ensey, Brian (Department: 2615)
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
C381S322000, C381S412000
Reexamination Certificate
active
07319771
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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Ensey Brian
Franklin Eric J.
P & B Research AB
Venable LLP
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