| 摘要 |
A giant-magnetostrictive speaker exhibiting good acoustic characteristics when it is used while being placed on a horizontal surface. The giant-magnetostrictive speaker comprises a bottomed and topped tubular yoke constituting a magnetic path, a giant-magnetostrictive element having one end secured to the lid of the yoke and the other free end and arranged in the tubular direction of the yoke to generate a displacement depending on variation of a magnetic field, a coil arranged around the giant-magnetostrictive element in the yoke and generating a magnetic field depending on a signal supplied externally, a vibration rod so arranged that one end thereof touches the free end of the giant-magnetostrictive element and the other end extending through the center hole in the bottom of the yoke transmits displacement of the giant-magnetostrictive element to an external object and provided with a flange at an intermediate portion, a rubber elastic body arranged between the flange of the vibration rod and the bottom of the yoke, and a body section for exerting a load on the giant-magnetostrictive element through the yoke in a state where the other end of the vibration rod is placed on the external object so that the giant-magnetostrictive speaker can stand by itself and transmitting the displacement of the giant-magnetostrictive element effectively to the external object by the mass. |
