| 摘要 |
<p>A sound absorptive metallic board has a top appearance side comprising multiple tiny cured sections, and has multiple tiny geometric cavities (12) on a bottom thereof, which are in the shape of a three-dimensional cone, and in communication with the top surface side (11); sound waves in all directions will be reflected and refracted, and collide and interfere with each other to weaken when they hit the conical surface of the bottom tiny geometric cavities (12) and the top surface side (11); at the same time, relatively small proportions of the sound waves will penetrate the metallic board (1), and they will further weaken owing to the multiple tiny cured sections and the multiple tiny geometric cavities(12).</p> |
