| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a sound absorbing structure for improving a sound absorbing characteristic of a wide frequency band, without increasing bulk density and thickness of a sound absorbing base material, and without providing air layers in series to sound wave incidence in the sound absorbing base material. <P>SOLUTION: The sound absorbing structure is characterized by forming air rooms 3 open to a porous sound absorbing base material 1 at a side face, to the porous sound absorption base material 1 which is preferably polyester fiber-based nonwoven material, confronting sound wave incidence. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
