Patent ID: 6903474

Claim:
An electro-mechanical transducer for providing high power vibration comprises: a housing ( 23 ) for mounting on a desired place, a magnet means ( 11 ) having an N-pole and an S-pole, only one pole of which is fixed to said housing ( 23 ), an electromagnet ( 13 ) movably installed into said housing so as to face either the S-pole or the N-pole of said magnet means ( 11 ), whichever one is not fixed to said housing ( 23 ), an inertial mass ( 17 ) for amplifying inertial force of reciprocating movement of said electromagnet ( 13 ), so that said housing ( 23 ) including the magnet means ( 11 ) can be vibrated by said electromagnet ( 13 ), part of elastic members ( 19 a , 19 b ) for laterally retaining said electromagnet ( 13 ), so that a resisting force is exerted on said electromagnet ( 13 ) in the direction opposite to its motion, a frame ( 25 ) disposed underneath said inertial mass ( 17 ) and supported by the pair of elastic member ( 19 a , 19 b ) for retaining said electromagnet ( 13 ), and a pair of spaces ( 21 ) disposed between said magnet means ( 11 ) and said electromagnet ( 13 ) for maintaining a separation between the two components when the electromagnet ( 13 ) approaches the magnet means ( 11 ), whereby said electromagnet ( 13 ) vibrates in a reciprocating fashion towards or away from the magnet means ( 11 ) in accordance with the interaction between the polarity formed at the electromagnet ( 13 ) by acoustic signal applied to the electromagnet ( 13 ) and either the N-pole or the S-pole of the magnet means ( 11 ).