Abstract: The invention relates to a sun protection device that has a plurality of segments that are spaced apart from one another parallel to their longitudinal direction and that are received so as to be rotatable about their longitudinal axis. The segments have respective segment top surfaces on which a plurality of optical concentrator structure elements from an at least partially transparent dielectric material, so-called CPCs (Compound Parabolic Concentrators) are provided. Said concentrators have a surface of incidence and one planar or curved receiving surface and are oriented with their receiving surface toward the segment top surface. The invention is characterized in that the segment top surface, at an angle to its longitudinal direction, is at least partially curved or edged, the segment top surface is reflecting or opaque, and the CPCs adjoin the segment top surface with their receiving surface directly or across at least one coupling layer or are spaced apart and disposed opposite the segment top surface.

Abstract: Described is a device for guiding light consisting of at least one partially translucent surface material, with a surface upper side, which has optically active surface structures for guiding and/or scattering light, as well as an optically switchable coating provided at least in partial areas of the surface structures, or at least two directly or indirectly opposing surface upper sides, of which one exhibits optically active surface structures for guiding and/or scattering light, and the other provides an optically switchable coating that covers at least parts of the surface upper side.

Abstract: Disclosed is a sun protection device for transparent apertures in a building against direct incident sunlight entering the interior of the building, said device comprising at least one optical flat element (F) consisting of an at least partially transparent material, being installable in the region of said building aperture, and having two flat element sides facing each other, of which one (E) is designed non-structured and plane, and the other (S) being provided with prismatic linearly extending structural elements (SE) running in parallel and recurring periodically in lateral direction.