MULTILAYER BODY AND METHOD FOR PRODUCING A MULTILAYER BODY

摘要

The invention relates to a multilayer body (5) and a method for producing a multilayer body (5). The multilayer body (5) has a transparent first layer (51), into which are impressed a multiplicity of cylindrical lenses having a length of more than 2 mm and a width of less than 400 µm, which are arranged in accordance with a microlens grid spanning a first coordinate system having a coordinate axis X1, which is determined by the focal point lines of the cylindrical lenses, and a coordinate axis Y1 perpendicular thereto. In a second layer (52), which is arranged below the first layer at a fixed position with respect to the first layer, a multiplicity of microscopic structures in the form of microimages are formed, which are distorted along a longitudinal axis relative to a transverse axis in accordance with a transformation function, and which are arranged in accordance with a microimage grid spanning a second coordinate system having a coordinate axis X2 and a coordinate axis Y2 perpendicular thereto. In a region of the multilayer body in which the microlenses of the microlens grid and the microscopic structures of the microimage grid overlap, the line spacing determined by the spacing-apart of the focal point lines of the cylindrical lenses and the microimage spacing determined by the spacing-apart of the area centroids of the microimages differ from one another by not more than 10%. In order to form the multilayer body (5), the second layer is applied to a third layer, the first layer is arranged above the third layer and the first, second and third layers are laminated together using heat and pressure by means of a tool (41, 42, 43), engaging on the top side of the first layer and the underside of the third layer. In this case, the lens grid is impressed into the surface of the first layer into the top side of the first layers by means of a pressing plate in which the negative form of the lens grid is impressed.