Double wall acoustic panel

Abstract

The invention relates to an acoustic panel comprising first and second walls having a sound absorber disposed therebetween, wherein the first wall presents, on an inside face facing towards the sound absorber, a plate of viscoelastic material and a backing plate, spacer elements being distributed in at least one dimension and creating an air gap between the absorber and the backing plate.

1 . An acoustic panel comprising first and second walls between which a sound absorber is disposed, wherein the first wall presents on an inside face facing towards the sound absorber, a plate of viscoelastic material, and also a backing plate carrying spacer elements that are distributed in at least one dimension and that create an air gap between the absorber and the backing plate.  
   
   
       2 . An acoustic panel according to  claim 1 , wherein the spacer elements form a two-dimensional array.  
   
   
       3 . An acoustic panel according to  claim 1 , wherein said array comprises a grid, a honeycomb, or embossing.  
   
   
       4 . An acoustic panel according to  claim 3 , wherein the grid, the honeycomb, or the embossing constitutes a net with the sound absorber being placed inside the net.  
   
   
       5 . An acoustic panel according to  claim 2 , wherein the array comprises studs distributed in said two dimensions.  
   
   
       6 . An acoustic panel according to  claim 2 , including a self-adhesive film carrying said array, said film being stuck onto the sound absorber, in particular onto packaging of the sound absorber.  
   
   
       7 . An acoustic panel according to  claim 1 , wherein said spacer elements are reinforcing elements secured to the backing plate.  
   
   
       8 . An acoustic panel according to  claim 7 , wherein said reinforcing elements are embossing, in the form of optionally parallel ribs, a honeycomb, studs, or bosses.