| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a drum having a free and stable shape and a wide sound range at a low cost. <P>SOLUTION: The drum has a body which uses a foamed synthetic resin (polystyrene foam) as the core material. Thickness of the drum is greatly changed from a body opening section A to a center section B while the body is surface treated by stacking glass fiber reinforced plastic (FRP) providing changes in sound vibration and a sound speed inside the body. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
