| 摘要 |
PURPOSE:To obtain a uniform directivity at a broad frequency range, by arranging under dispersion a plurality of cores of almost spindle shape at the inside of a conical horn. CONSTITUTION:The change in cross section can be formed into a prescribed shape such as exponential hyperbolic shape, by arranging under dispersion a plurality of spindle-shaped cores 1A at the inner circumference of a horn main body 1 of conical shape in matching with the radial direction of the horn main body 1. Thus, uniform directivity can be obtained independently of transversal and longitudinal directions at a broad frequency range, and further a broad band characteristic as a horn of exponential and hyperbolic form can also be obtained. Since it is unnecessary to deform sound path unreasonably, a straight characteristic can be obtained without parasitic resonance. |
