Michael James Desimone

US Patent:

20060093179, May 4, 2006

Filed:

Oct 12, 2005

Appl. No.:

11/248654

Inventors:

Michael Desimone - Redmond WA, US
David Brown - Enumclaw WA, US

International Classification:

H04R 9/06

US Classification:

381400000

Abstract:

A dynamic transducer having a voice coil attached to and suspended between two diaphragms that comprise two opposite sides of an enclosure. The voice coil is suspended within the enclosure on a center support that passes through the enclosure and is attached to the diaphragms. Within the enclosure, an annular magnet having a hollow cylindrical ferromagnetic core is disposed between two annular ferromagnetic plates and is attached to one of the plates. A narrow gap is formed within the magnetic structure. The voice coil travels within the gap and is attached to a non-ferromagnetic shaft that extends through the hollow cylindrical ferromagnetic core. The voice coil is fastened to the diaphragm comprising each side of the housing, so that the diaphragms move to produce audible sound. An internal fusing mechanism is directly attached to the voice coil to protect the coil against thermal and electrical overload.