Electro acoustic planar transducer

Details Electro acoustic planar transducer Electro acoustic planar transducer

H - Electricity

04

R

181/3, 349/70

H04R 7/18 (2006.01) H04R 1/24 (2006.01) H04R 11/02 (2006.01)

Patent

CA 1180437

ABSTRACT OF THE DISCLOSURE An electro-acoustic transducer using thin, light- weight, planar diaphragms driven by strategically located, coil driven, high-energy, permanent magnels. A framework maintains the diaphragms in substantially co-planar relationship a predetermined distance from and parallel to a rear support wall. The diaphragms include at least one hinged woofer diaphragm and a foam-supported tweeter diaphragm. The small, high energy movable permanent magnets are attached to the rear surface of each movable diaphragm. Cooperating with each movable magnet is a respective, stationary electromagnetic coil with a cross- over network directing the incoming signal to the appro- priate coils, thereby placing the magnets and attached diaphragms into cooperating fore and aft motion. The frontal acoustical waves produced by each woofer con- structively interfere to augment low frequency response. The tweeter construction provides wide frontal dispersion of high frequency acoustical waves. Woofer backwaves are attenuated before emerging along the rear support wall and the tweeter backwave is vented into a rear isolative chamber.

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