| 摘要 |
PURPOSE:To change an acoustic characteristic, by partitioning the inside of an enclosed speaker into two closed spaces, where gases A and B different in specific gravity are charged, with a thin film. CONSTITUTION:Reflection of the sound is utilized which is caused on a thin film, which does not permit gaseous molecules to pass through and able to be ignored acoustically, namely, a boundary face between gases different in specific gravity which is formed with materials by which propagation of the sound is not changed if they exist in air. That is, the inside of an enclosed speaker 1 is partitioned into two closed spaces, where gases A and B are charged, with a thin film 3, and gases A and B are made different in specific gravity each other to change the acoustic characteristic as compared to the case where gases A and B are the same gas or the thin film does not exist. If the method of partitioning in the cabinet and gases to be charged in the cabinet are selected properly, the performance is improved comparing with the conventional speaker device of the same dimensions. |
