A roller blind for covering openings to refrigeration units, windows, and sliding roofs for vehicles is provided in which the roller blind web defines a tubular pocket along respective longitudinal sides of the web. Each multiplex block corresponds to a distinct interrupt request line. A coupling device for coupling light between such a planar optical component and an optical assembly has a lens array with a multiplicity of lenses disposed along a two-dimensional grid. If the thickness of the titanium layer is kept between 2 nm and 10 nm in the lamination thereof, the ferroelectric thin film will have a priority orientation of, and if it is kept between 10 nm and 20 nm, the ferroelectric thin film will have a priority orientation of.