Patent ID: 8619366

Claim:
An insulated glazing unit with at least one optical element inside it, comprising at least two glass panes, where the optical element has a plurality of perforations and a non-perforated area, where the non-perforated area prevents penetration of light in a building where the insulated glazing unit is mounted, and where the perforations have a depth/width ratio that allows for passage of light with given angles of incidence, while light having other angles of incidence are unable to pass though the perforations, which provides a shading effect, wherein the optical element is arranged between the two glass panes and attached to one of the glass panes by means of an adhesive, which covers at least a part of the area of the optical element, and where the adhesive is substantially not present in the perforations of the optical element, and wherein the optical element is made from a rigid material having a Young's modulus larger than 2 GPa.