Optical acoustic panel

Abstract

An optical acoustic panelfor absorbing sound and providing a daylight appearance and a luminaire are provided. The optical acoustic panelcomprises a first side, a second side, a micro perforated foiland a spacing structure. The first sidereceives sound. The second sideis opposite the first sideand receives light. The micro perforated foilcomprises sub-millimeter holes, is light transmitting and is arranged at the first side. The sub-millimeter holesare entrance holes of a cavity. The spacing structurespaces the first sideat a predefined distance from the second side. The spacing structurecomprises a plurality of light transmitting cells. The light transmitting cellscomprise a light transmitting channel, a light exit window, a light input windowand a wall. The light transmitting channelcollimates a part of the light received at the second sideof the optical acoustic panel. The light transmitting channelsextend from the first sidetowards the second sideand are filled with air. The light input windowis arranged at the second side. At least a part of the light exit windowbeing arranged at the first side. The wallis interposed between the light input windowand the part of the light exit window. The wallencloses the light transmitting channel. At least a part of the wallbeing 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