Patent ID: 9147390
Filing Date: 2015-09-29
Classification: E04B,F21V,G10K

Abstract:
1. An optical acoustic panel for absorbing sound and providing a daylight appearance, the optical acoustic panel comprising: a first side for receiving sound, a second side for receiving light, the second side being opposite the first side, a micro perforated foil comprising sub-millimeter holes, the micro perforated foil being light transmitting and being arranged at the first side, the sub-millimeter holes being entrance holes of a cavity, a spacing structure for spacing the first side at a predefined distance from the second side, wherein the spacing structure comprises a plurality of light transmitting cells, the light transmitting cells comprising: a light transmitting channel for collimating a part of the light received at the second side of the optical acoustic panel, wherein the light transmitting channels extend from the first side towards the second side and are filled with air, a light input window arranged at the second side of the optical acoustic panel, a light exit window, at least a part of the light exit window being arranged at the first side of the optical acoustic panel, a wall interposed between the light input window and the part of the light exit window, the wall enclosing the light transmitting channel, at least a part of the wall being reflective or transmissive in a predefined spectral range for obtaining a blue light emission at relatively large light emission angles with respect to a normal to the first side of the optical acoustic panel, and wherein, a diameter (d