| 摘要 |
PURPOSE:To provide on-vehicle acoustic equipment without leaking the voice of oneself to another listener seating at an adjacent seat and preventing sound listened to by another listener from being heard. CONSTITUTION:An acoustic tube 3 to introduce an acoustic wave is arranged at the front plane of a speaker diaphragm, and a partitioning plate 5 continuously provided toward the aperture part of the acoustic tube 3 from a speaker diaphragm plane and with length of 1/3 of the acoustic tube is provided so that the cross-section of a sound introducing part surrounded by the partitioning plate 5 and an acoustic tube wall can be smaller on a diaphragm side and increased or kept constant as approximating to the aperture part of the acoustic tube, and a sound absorbing material 6 is provided between the partitioning plate 5 and the acoustic tube wall in the inside of the acoustic tube, and the sound absorbing material 6 is formed between the aperture terminal of the partitioning plate 5 and that of the acoustic tube 3 in such a way that the change of the cross-section of the sound introducing part from a partitioning plate side to the aperture part can be increased or kept constant. |
