Document Holographic Security Marking via Shaped Transfer Iron
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Solution Overview
Problem
Existing security marking methods using zero-order diffraction gratings suffer from poor readability due to vitreous reflections from protective layers, which interfere with the visibility of the signs when transferred onto documents.
Innovation Solution
The method involves using marking irons shaped like the signs to be transferred, allowing direct application onto documents without protective layers, thereby enhancing readability by eliminating vitreous reflections and enabling distinct optical effects from separate bands on either side of a longitudinal line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is used to protect the zero-order diffraction grating signs, then the signs are preserved, but the readability of the signs deteriorates due to vitreous reflections
Solution Approach 1:
The patent removes the protective layer (pellet) that causes vitreous reflections and interferes with the readability of the zero-order diffraction grating signs. By extracting this harmful element, the signs can be directly observed on the document surface without the interfering reflection layer, thereby improving readability while maintaining security.
Solution Approach 2:
The patent introduces a new intermediary element - the marking iron with the shape of the sign - that allows direct transfer of the zero-order diffraction grating signs onto the document without requiring a protective pellet. This intermediary enables the signs to be applied directly to the document surface, eliminating the protective layer that caused the reflection interference.
2Reliability
If the entire patch is transferred onto the document, then the signs are secured, but the vitreous reflection from the patch area hinders reading of the zero-order diffraction gratings
Solution Approach 1:
The patent segments the transfer process by using a marking iron with the specific shape of the sign rather than transferring an entire patch. This segmentation allows only the necessary sign area to be transferred onto the document, eliminating the vitreous reflection from unnecessary patch areas while maintaining the security marking function.
Solution Approach 2:
The patent extracts the harmful vitreous reflection component by not transferring the protective pellet that causes it. Instead, the marking iron directly applies the zero-order diffraction grating signs to the document surface, removing the source of the interfering reflection and improving the readability of the security markings.
3Adaptability or versatility
If multiple signs with different optical properties are transferred together, then the security marking is enhanced, but the areas between the signs interfere with the legibility of the signs
Solution Approach 1:
The patent segments the transfer of multiple signs by using separate marking irons for each sign, allowing precise control over which areas are transferred. This segmentation prevents the transfer of unwanted areas between signs, ensuring that each sign maintains its optical properties and legibility while still providing enhanced security through multiple signs.
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
This approach improves the readability of zero-order diffraction gratings by eliminating interfering reflections, allowing for clear, distinct optical effects that are easily identifiable and authenticable, even by unqualified individuals.
Implementation Method 1
a superposition step in which a marking film is superimposed on which are formed a plurality of transferable zero-order diffraction gratings on said document
Implementation Method 2
During hot transfer, the entire patch is deposited on the document
Data Source
Figure 1~4
AI summary
The method involves superposing a marking film (1) on which a set of zero order diffraction networks are formed that are transferable on a document. The film has optically active marks that are provided in the form of numeric characters. Marks to be transferred (2, 3) are transferred on the document by applying a marking iron on the marking film. The marking iron has the shape of the marks to be transferred. The film comprises zero order diffraction networks producing their distinct optical effects. An independent claim is also included for a marking film comprising a uniform zero order diffraction network band.