Electro-mechanical transducer
An apparatus adopting an iron core and an inertial mass is disclosed for exerting high power output by converting a sound signal to vibration so as to stimulate the human hearing organs through the bones. A sound-to-vibration conversion apparatus comprises a housing, a permanent magnet having an N-pole and an S-pole, only one pole of which is fixed to the housing, an electromagnet movably installed into the housing faced either the S-pole or N-pole of the permanent magnet, whichever one is not fixed to the housing, and an inertial mass for amplifying the inertial force of reciprocating movement of the electromagnet, so that the housing with the permanent magnet can be vibrated by the electromagnet, whereby the electromagnet vibrates in a reciprocating fashion towards or away from the permanent magnet in accordance with the incubation between the polarity formed at the electromagnet by acoustic signal applied to the electromagnet and either the N-pole or the S-pole of the permanent magnet.
1. 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 ).
2. A transducer according to claim 1 , wherein said magnet means ( 11 ) is a permanent magnet.
3. A transducer according to claim 1 , wherein said electromagnet ( 13 ) forms an E-shaped iron core having three protrusions with a coil winding around a central protrusion.