Abstract:
The invention provides a sound attenuating panel (100) with controllable sound attenuation properties, the sound attenuating panel (100) comprising (a) a sound attenuating unit (200) with cavities (212) with variable dimensions and (b) an infrastructure (300) for controlling the dimensions of the cavities (212) in the sound attenuating unit (200). The sound attenuating unit comprises sound attenuating material with controllable sound attenuating properties, but may also have wave guiding properties, thereby allowing to combine in the sound attenuating unit 200 both sound attenuating properties and optical properties.
Abstract:
Disclosed is a product comprising a luminous surface, the product comprising a light guide (10) providing said luminous surface, said light guide comprising a plurality of scattering elements (12) for producing a substantially homogeneous light output across said luminous surface; and a first solid state lighting element (20) arranged to emit a beam of light (30) into the light guide; wherein the light guide further comprises a body (40) arranged to create a region (50) in the light guide shaded from said beam.