H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/70
H04R 9/06 (2006.01) H04R 1/24 (2006.01)
Patent
CA 1335611
An improved electro-acoustic transducer comprises: a magnetic circuit including a centre pole piece and an annular pole piece defining therebetween a magnetic gap. The centre pole piece has an end face. A coil for receiving electrical power for driving the transducer is located at least partly in the magnetic gap. Also provided are: a suspension; a fluid in the magnetic gap; a high frequency acoustic dome radiating element made of electrically conductive material and comprising a diaphragm, which is mounted on the end face of the centre pole piece by the suspension; and a skirt which forms a shorted turn extending into the magnetic gap between the coil and the centre pole piece and spaced from the coil and the centre pole piece by the fluid. The acoustic dome radiating element has an interior surface and is mechanically independent of the coil. The shorted turn is inductively coupled to the coil. A non-compliant electrically insulating layer is located and supported on the interior surface of the acoustic dome radiating element.
601430
Elieli Boaz
Marks & Clerk
LandOfFree
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