Importance

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Abstract

A supermagnetostriction speaker featuring good acoustic characteristics when used being placed on a horizontal surface. The supermagnetostriction speaker comprises a yoke of a cylindrical shape having a bottom and a lid and constituting a magnetic path; a supermagnetostriction element which is fixed at its one end to the lid of the yoke, has the other end which is a free end, and is arranged in the direction of cylinder of the yoke to generate displacement depending upon a variation in the magnetic field; a coil arranged to surround the supermagnetostriction element in the yoke and generates a magnetic field in response to signals fed from an external unit; a vibration rod having a flange at an intermediate portion thereof and is so arranged that the one end thereof comes in contact with the free end of the supermagnetostriction element and that the other end thereof penetrating through the center hole in the bottom of the yoke transmits the displacement of the supermagnetostriction element to an external body; a rubbery elastic body arranged being held between the flange of the vibration rod and the bottom of the yoke; and a body portion exerting a load on the supermagnetostriction element via the yoke in a state where the other end of the vibration rod is placed on the external body in a manner that the supermagnetostriction speaker stands by itself, so that the displacement of the supermagnetostriction element is effectively transmitted to the external body due to the mass.

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First Claim