Security Hologram Production Feedback for Consistent Diffraction Efficiency
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Solution Overview
Problem
Existing methods for producing holograms in security elements and documents lack reliability and efficiency, particularly in mass production, leading to inconsistencies in optical diffraction efficiency.
Innovation Solution
A method and device that monitor and control the optical diffraction efficiency of holographic arrangements during production by adjusting process parameters such as laser settings and tempering conditions, using measuring devices to ensure conformity to predetermined efficiency standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mass production of holograms is implemented, then productivity increases, but manufacturing precision deteriorates due to inconsistencies in optical diffraction efficiency
Solution Approach 1:
The patent implements an online measurement system that continuously monitors optical diffraction efficiency during hologram production. The measured values are fed back to control process parameters such as laser exposure energy, tempering temperature, and humidity levels, enabling real-time adjustments to maintain consistent diffraction efficiency across mass-produced holograms
Solution Approach 2:
The patent systematically controls and adjusts critical process parameters including laser wavelength, exposure energy density, tempering temperature, and environmental humidity. By precisely managing these parameters and their changes during production, the system maintains manufacturing precision while enabling mass production throughput
2Manufacturing precision
If process parameters are adjusted to improve optical diffraction efficiency, then manufacturing precision improves, but device complexity increases due to monitoring and control systems
Solution Approach 1:
The system uses the hologram production process itself to generate measurement signals. The hologram structure created during production serves as the measurement target, and the diffraction of laser light through this structure provides automatic feedback on process quality, eliminating the need for separate complex measurement apparatus
Solution Approach 2:
The laser system serves dual functions: it both creates the hologram structure through exposure and provides the measurement light for diffraction efficiency evaluation. The same optical path and laser source are used for both production and quality control, reducing overall device complexity
3Reliability
If online measurement and control are implemented, then reliability improves, but loss of time increases due to additional measurement steps
Solution Approach 1:
The measurement of optical diffraction efficiency is performed continuously during the hologram production process rather than as a separate post-processing step. The online monitoring enables real-time detection and correction of deviations, maintaining reliability without adding time loss through sequential measurement steps
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
Enhances the reliability and consistency of hologram production by optimizing process parameters, reducing waste, and improving the quality of security elements and documents.
Implementation Method 1
The hologram is imaged in the holographic recording material and stored in the holographic recording material through photochemical or photophysical processes
Implementation Method 2
It penetrates the holographic recording material and is diffracted and/or reflected by the master, creating the hologram through interference with the incident light
Implementation Method 3
creating the hologram through interference with the incident light
Implementation Method 4
determining a diffraction efficiency for the inscribed holographic arrangement or structure
Data Source
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AI summary
The invention relates to a method and a device for producing a hologram for a security element, comprising: providing a holographic recording material (2) in a device (1) with processing stations which are set up to perform successive process steps of a process step chain in producing a hologram for a security element and thereby processing the holographic recording material (2) according to process parameters;and processing the holographic recording material (2) in a process step configured to expose the holographic recording material (2), wherein the holographic recording material (2) is processed according to process parameters assigned to the process step, and the processing comprises inscribing a holographic arrangement with the hologram for the security element into the holographic recording material (2) by exposing the holographic recording material (2), wherein the hologram is formed in the holographic recording material (2) by covering a hologram usable area. Furthermore, the method comprises the following: determining an optical diffraction efficiency of the holographic arrangement by means of a measuring device (15) in a further process step, which is downstream of the process step in the process step chain in the device (1) with the processing stations;Changing at least one process parameter if the measured optical diffraction efficiency differs from a predetermined optical diffraction efficiency; and applying the at least one changed process parameter during further processing of the holographic arrangement in another process step, which is downstream of the further process step in the process step chain in the device (1) with the processing stations, and/or during the production of another hologram for a security element in the device (1) with the processing stations.