Optically Variable Security Element With Local Dielectric Thickness

The patent applies different dielectric layer thicknesses to different areas: a first dielectric layer thickness in the microstructured area and a second, greater dielectric layer thickness in the non-microstructured area. This local differentiation ensures that both areas produce the same constructive interference color when viewed from their respective sides, resolving the optical appearance inconsistency while maintaining manufacturing simplicity through a unified application process.

The patent changes the dielectric layer thickness parameter between different areas to achieve consistent optical effects. By calculating and applying specific thickness values (first thickness for microstructured area, second greater thickness for non-microstructured area), the design ensures that both areas exhibit matching constructive interference colors from their respective viewing sides, thereby solving the appearance consistency issue.

The patent implements local quality by specifying different dielectric layer thicknesses for microstructured and non-microstructured areas. The first dielectric layer in the microstructured area has a thickness that produces a specific constructive interference color, while the second dielectric layer in the non-microstructured area has a greater thickness that produces the same color when viewed from the opposite side. This local differentiation achieves precise optical matching without complicating the overall production process.

The patent applies preliminary action by pre-calculating the required dielectric layer thicknesses before production. The design specifies exact thickness relationships (second thickness greater than first thickness) that will automatically produce matched optical appearances. This preliminary design approach ensures manufacturing precision is achieved through planned parameter specifications rather than post-production adjustments, maintaining high productivity.

The patent applies asymmetry by designing the security element to show different optical effects when viewed from opposite sides. The microstructured area and non-microstructured area are arranged asymmetrically, with the microstructure present on only one side. This asymmetric configuration ensures that counterfeiters cannot reproduce the security element by simple copying, as the optical appearance differs depending on which side is viewed, thereby enhancing anti-imitation protection while maintaining reasonable design complexity.

The patent utilizes the dimensional aspect by creating optical effects that are side-dependent. The security element leverages the third dimension (viewing angle and side) to generate different optical appearances. The microstructured area produces one optical effect when viewed from its side, while the non-microstructured area produces a different effect when viewed from the opposite side, adding a dimensional layer of security that prevents imitation without requiring overly complex structures.