H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/72
H04R 9/06 (2006.01) H04R 7/12 (2006.01) H04R 7/16 (2006.01) H04R 9/02 (2006.01) H04R 9/04 (2006.01) H04R 31/00 (2006.01)
Patent
CA 1110751
ABSTRACT OF THE DISCLOSURE A loudspeaker assembly including a basket, a diaphragm, and a structure defining an air gap having a magnetic field therein. The improvement in the assembly comprises a single-layer voice coil formed by conducting wire of rectangular cross-section wound upon a sheet metal bobbin having a longitudinal slit with an end portion of the conductor comprising the coil folded over from one end of the single layer to the other end. The air gap structure includes a front pole plate formed with a central opening that comprises structure defining an air gap and a notch extending radially outward from the central opening of area slightly greater than the cross-sectional area of the folded-over end portion with the folded-over end portion passing through the notch in non-contacting relationship with the front pole plate. A support structure supports the voice coil and bobbin in the air gap to substantially fill the air gap while being in non-contacting relationship with the structure defining the air gap.
278155
Bose Corporation
Swabey Ogilvy Renault
LandOfFree
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