Low frequency sound transducer

Details Low frequency sound transducer Low frequency sound transducer

H - Electricity

04

R

349/66, 349/68

H04R 15/00 (2006.01) B06B 1/08 (2006.01)

Patent

CA 1242268

"Low Frequency Sound Transducer" Abstract of the Disclosure A low frequency sound producer including a plur- ality of magnetostrictive vibrators arranged seriatim end to end to define a ring. Each vibrator unit in- cludes a plurality of laterally related magnetostric- tive rods which, in the illustrated embodiment, are formed of rare earth magnetostrictive material. Struc- ture is provided for compressively prestressing the rods. The prestressing structure includes permanent magnets for providing a permanent magnetic bias in the rods. Coils are magnetically coupled to the rods for causing the desired magnetostriction thereof corres- ponding to an input AC signal applied to the coils. Opposite ends of the individual vibrator units define facial abutments in defining the continuous ring con- figuration. In the illustrated embodiment, the ring configuration is polygonal and the facial abutment surfaces at the ends of the units define a 60° in- cluded angle. The entire sound producer is provided with an outward enclosure of synthetic resin whereby each vibrator unit defines an enclosed water-sealed assembly.

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