公开(公告)号：BRPI0604240A

公开(公告)日：2007-08-21

申请号：BRPI0604240

申请日：2006-10-06

Applicant: SONY CORP

Inventor： KITAGAWA NOBUKAZU ,  URYU MASARU ,  OHASHI YOSHIO

IPC: H04R15/00 ,  H04M1/00 ,  H04R1/00

Abstract: A portable audio drive unit (100) has a case (120), an audio signal output section that outputs an audio signal, and a magnetostrictive actuator (110) that drives on the basis of the audio signal output from the audio output section. The magnetostrictive actuator (110) includes a displacement transfer section. The displacement transfer section has a driving rod (110a). The displacement transfer section transfers a displacement of the driving rod (110a). The magnetostrictive actuator (110) is arranged in the case with the displacement transfer section being protruded from the case or being retractable into the case.