| 摘要 |
PURPOSE:To perform the increase in the low sound characteristics in use and the reduction in the occupied space in nonuse, by enabling the change of inner volume through the use of bellows. CONSTITUTION:The speaker 4 is fixed in the open hole 7 of the front plate 1, and the opening of the bellows 3 is fitted to the front plate 1 in the form that this speaker 4 is covered from the back. Further, the opening of opposite side of the bellows is fixed to the rear plate 2. Thus, in use, the bellows is extended and the increase in low sound characteristics by increasing the volume of the speaker box, and in not use, the bellows 3 is compressed and the space occupied by the speaker box can be reduced. |
