Patent ID: 8126169
Filing Date: 2012-02-28
Classification: H04R

Abstract:
1. A supermagnetostriction speaker comprising: 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 a 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 generate a magnetic field in response to signals fed from an external unit; a vibration rod having a flange at an intermediate portion thereof and so arranged that the one end thereof comes in contact with the free end of the supermagnetostriction element and that the other end thereof penetrates through the center hole in the bottom of the yoke and transmits the displacement of the supermagnetostriction element to an external body; a rubbery elastic body comprising silicone rubber arranged between the flange of the vibration rod and the bottom of the yoke; and a body portion having a predetermined mass, and 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.