Pneumatic Probe for Security Embossing Quality Testing
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Solution Overview
Problem
Existing methods for checking the quality of surface embossing on embossing plates used in security documents are time-consuming and costly, requiring specialized equipment and personnel, and are not efficient for examining large areas.
Innovation Solution
A device with a test head having a surface relief complementary to the target contour of the embossing, connected to a vacuum generating device, measures air flow into a free volume to determine if the embossing matches the target contour, providing quick and cost-effective quality assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If microscope examination is used to check surface embossing quality, then measurement precision is improved, but device complexity and time consumption increase
Solution Approach 1:
The patent replaces the mechanical/optical microscope system with a pneumatic measurement system. A test head with a cavity is placed on the surface embossing, and air pressure changes are measured to detect deviations. This substitutes complex optical mechanics with simpler pneumatic principles, reducing equipment complexity while maintaining detection capability.
Solution Approach 2:
The patent introduces air pressure as an intermediary parameter to detect surface embossing quality. Instead of directly observing the embossing structure with a microscope, the system uses air pressure changes in a cavity as a mediator to indirectly measure deviations from the target contour, simplifying the measurement approach.
2Measurement precision
If microscope examination is used to check surface embossing quality, then measurement precision is improved, but time consumption increases
Solution Approach 1:
The patent replaces time-consuming microscope examination with rapid pneumatic measurement. The test head is placed on the surface embossing and air pressure is measured, providing quick results without the lengthy focusing and imaging required by microscopes, thus reducing examination time while maintaining accuracy.
3Measurement precision
If laser scanning microscopes are used to examine lens structures, then measurement precision is improved, but device complexity and examination time increase
Solution Approach 1:
The patent replaces complex laser scanning microscopy with a simpler pneumatic test system. Instead of using laser beams and complex optical scanning mechanisms, the system uses air pressure changes in a cavity to detect lens structure deviations, significantly reducing device complexity while maintaining measurement precision.
4Measurement precision
If microscope examination is used to check surface embossing quality, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The patent replaces slow microscope examination with rapid pneumatic measurement. The test head is placed on the surface embossing and air pressure is measured, providing quick results that significantly improve inspection efficiency and productivity while maintaining the necessary quality detection accuracy.
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
Enables rapid and economical quality checking of large sections of surface embossing without requiring specialized knowledge, allowing for efficient detection of deviations from the target contour.
Implementation Method 1
a negative pressure is generated in the free volume with the vacuum generating device
Implementation Method 2
the amount of air flowing into the free volume depends on whether the surface relief in a relief area which encloses the free volume is complementary to the surface embossing to be tested
Data Source
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AI summary
The invention relates to a method for quality testing of a surface embossing (110) of an embossing sheet (105) for the production of security documents and to a corresponding device (200).The quality inspection procedure comprises the following steps: - Placing the probe head (10) with relief area (24) onto the surface embossing (110) to be inspected, such that the relief area (24) rests on the sub-area (115) of the surface embossing (110) that corresponds to the target contour (130) complementary to the relief area (24), - Evacuating the free volume (30) in the probe head (10) by means of the vacuum generation device (270) connected thereto and measuring a vacuum or fluid flow that develops in the fluid connection (220) of the at least one free volume (30) in the at least one probe head (10) with the vacuum generation device (270) by means of a measuring device (210) and deriving and outputting quality information based on the determined vacuum or fluid flow.