| 摘要 |
PURPOSE:To improve directivity at a high frequency band as well and to widen a service area by providing a central partition wall, which partitions the pair of folded sound paths facing to a mouth part, and providing a protrusion part, which is formed with a streamline shape in parallel with the sound path, on the both sides of the central partition wall. CONSTITUTION:The upper horn 10 and the lower horn 11 having a same constitution are combined and jointed together, and a horn throat part 12 is constituted to be circular and a horn mouth part 13 is constituted to be rectangular, a reflex horn is formed. The central partition wall 18, which partitions a pair of the folded sound path 21 facing to the mouth part, is provided, and on the both sides of the partition wall 18, the protrusion part 27, which is formed with the streamline shape in parallel with the sound path 21, is provided. Thus, a sound wave passing through the sound path 21 is diffused in directions along the surface of the protrusion part 27, and the mutual interference of the sound waves outputted from the pair of the horns of a left and a right sides, is suppressed. Accordingly, the directivity is improved in the high frequency band as well and the service area can be widened. |
