Diffractive Lattice Image with Segmented Grating Lines
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Solution Overview
Problem
Current security features in documents and valuables lack a combination of attractive visual appearance and high forgery resistance, particularly in lattice images used for authenticity verification.
Innovation Solution
A lattice image with a diffractive grating structure divided into partial elements with uninterrupted grating lines, separated by short transverse regions, featuring stepwise varying distances and irregularly interspersed defects, creating a shimmering three-dimensional curvature effect when illuminated.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lattice images are used for security features, then they provide basic authenticity verification, but they lack attractive visual appearance and high forgery resistance
Solution Approach 1:
The lattice image is divided into multiple partial elements (sub-areas) that are separated by separating regions. Each partial element contains uninterrupted grating lines with specific spacing and orientation, creating a complex overall structure that is difficult to counterfeit while maintaining visual appeal through the segmented design
Solution Approach 2:
Different regions of the lattice image have different local characteristics - some partial elements have specific grating line orientations, spacings, and curvature radii that vary from one region to another. This local variation creates a unique pattern that enhances both visual appearance and security against forgery
2Reliability
If the lattice image is divided into partial elements with separating regions, then forgery resistance is enhanced, but the visual continuity may be affected
Solution Approach 1:
The separating regions are designed with specific characteristics (width, position, orientation) that are optimized to maintain visual continuity while providing security features. The partial elements are arranged and sized so that the separating regions do not disrupt the overall visual flow of the lattice image
3Shape
If grating lines are arranged with stepwise varying distances, then three-dimensional curvature effect is created, but manufacturing precision requirements increase
Solution Approach 1:
The grating line spacing is varied in discrete steps between different partial elements rather than continuously. This stepwise variation creates the desired three-dimensional curvature effect while being more manageable for manufacturing, as each partial element can be produced with standard precision tolerances
Solution Approach 2:
The grating line spacing parameter is changed in specific discrete steps across different partial elements to create the three-dimensional curvature effect. By controlling the spacing parameter in a stepwise manner rather than continuously, the manufacturing precision requirements are reduced while still achieving the visual effect
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a visually appealing and highly secure lattice image that is difficult to counterfeit, combining attractive visual effects with enhanced security features, including a high degree of complexity and authenticity verification through substructure inspection.
Implementation Method 1
the lattice image has a diffractive lattice structure that contains a large number of straight and/or curved lattice lines and, when illuminated, the motif with the shimmering creates a three-dimensional arching effect
Data Source
Figure 1~2
Figure 3~4
Figure 5a~5b
AI summary
The grid image has a diffractive grid structure, which is divided into multiple subelements, which are filled with continuous grid lines and which are separated from each other by separation areas running transverse to the grid lines. The continuous grid lines are arranged in the subelements with stepwise varying distances and with irregular interspersed gridline discontinuities. Independent claims are also included for the following: (1) a method for producing a grid image for representing a theme with an outline contour appearing with a shimmering three dimensional curve effect; (2) a safety element with a hologram element; (3) a data medium such as a bank note; and (4) a forming die for generating an embossed structure.