| 摘要 |
PROBLEM TO BE SOLVED: To overcome the problem such that although independent bubble foamed plastic exhibits significantly excellent sound conduction performance and vibration transmission performance on contrary to acoustic performance of continuous bubble foamed plastic, these characteristics are not utilized nor applied at all in the prior art but unknown or undeveloped state is left as it is. SOLUTION: A foamed plastic cube 1 is provided integrally with a sound source of a metallic or ceramic plate, a rod, a pipe, a wire, a string, a band, or the like, so that an article like a music instrument generating a large sound is provided. The foamed plastic cube 1 having an arbitrary shape is formed of independent bubble foamed plastic, e.g. foamed styrol, a foamed plastic screen 1a having a surface serving as an image projection screen is provided, and a sound generating screen is obtained by providing a sound generating source, i.e., a speaker 2f, integrally at a part of the foamed plastic screen 1a. |
