TRANSLUCENT PERFORATED LAMINATE ACOUSTICAL BOARD AND TRANSLUCENT ACOUSTICAL PANEL

摘要

An acoustical panel which is excellent in sound absorbing characteristics, provided with translucency and transparency, hard to be contaminated, and free from erroneous operation of highway ETC devices. An acoustical board is used that is obtained by laminating two transparent, perforated resin sheets, each having a thickness of 1-5mm, a hole diameter of 1-10mm and an aperture ratio of 5-50%, so as not provide through openings. The acoustical pane comprises this acoustic board disposed on a sound source side and a transparent resin sound shield board on an anti-sound source side that are held by a frame member and, if necessary, a middle rail. A sound absorbing material such as a soft fibrous sound absorbing material is preferably lined further on the insides of the frame member and the middle rail.