| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce noise when colliding with a key or a hammer or the like and prevent granular bodies from spilling out of a bag part in the case of using a particle bag composed by filling the bag part with the granular bodies as a stopper member of the key or the hammer or the like of an electronic piano. <P>SOLUTION: A combination layer 32 is formed by combining granular bodies 26 and a connection material 28 on an inner surface of a bag part 22, and a central layer 34 filled with only the granular bodies is formed in further inner side thereof. In the combination layer 32, the granular bodies can be prevented from spilling outside through vent holes 22a by the connection material 28 connecting the granular bodies 26 with each other even when the diameter of the granular bodies 26 is equal to below the diameter of the vent holes 22a. Also, noise occurring when the granular bodies 26 collide each other in the central layer 34 is absorbed through the connection material 28 in the combination layer 32. <P>COPYRIGHT: (C)2009,JPO&INPIT |
