Security Document Trimming via Optical Protrusion Detection
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Solution Overview
Problem
The production of book-like security documents often results in rejects due to manufacturing tolerances causing internal document features to be misaligned after trimming, as existing methods only consider external features, leading to inefficient manual quality controls and increased waste.
Innovation Solution
A method and device that use optical detection of protruding positions to determine the spatial position of internal document features, allowing for the adjustment of trimming trajectories to ensure accurate alignment and reduce waste by imaging the overhanging section and determining its spatial position relative to the document's coordinate system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If trimming trajectory is determined based on external document features only, then the trimming process is simple and fast, but internal document features become misaligned after trimming due to manufacturing tolerances
Solution Approach 1:
The patent applies preliminary action by detecting and recording the positions of internal document features before the trimming operation. The system captures images of internal features through transparent covers during earlier production stages, stores their coordinate information, and uses this pre-acquired data to calculate the optimal trimming trajectory, thereby ensuring precise alignment without compromising trimming speed
Solution Approach 2:
The patent introduces an intermediary coordinate system that links external and internal document features. By establishing transformation relationships between the coordinate systems of external features (visible on cover) and internal features (hidden inside), the system can determine trimming trajectories that ensure proper alignment of internal features while maintaining the simplicity of external feature-based trimming
2Manufacturing precision
If frequent manual quality controls are performed to check internal feature alignment, then manufacturing precision improves, but production time increases and waste does not reduce
Solution Approach 1:
The patent replaces manual quality control with an automated optical detection and calculation system. Image capture devices automatically detect document features, and a control unit calculates appropriate trimming trajectories based on detected positions, eliminating the need for time-consuming manual inspection while maintaining high alignment accuracy
Solution Approach 2:
The system implements feedback by using detected positions of internal document features to adjust and optimize trimming trajectories. The control unit continuously monitors feature positions and modifies trimming paths accordingly, ensuring consistent alignment quality without requiring repeated manual checks
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 reduces the number of rejects and waste by enabling precise trimming based on the spatial position of both visible and invisible document features, ensuring the security document meets format criteria and improving production efficiency.
Implementation Method 1
optical detection of the protruding position enabling the determination of a document-related spatial position of document features that cannot be detected optically
Data Source
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AI summary
The invention relates to a device and a method for producing a security document (1), wherein: the security document (1) is provided with at least one projecting layer (6); at least one image of at least one projecting section (7) of the projecting layer (6) is produced; a document-related spatial orientation of the projecting section (7) is determined in an image-based manner; a document-related spatial orientation of at least one non-imaged document feature of the security document (1) is determined according to the document-related spatial orientation of the projecting section (7), and a cutting trajectory (11) is determined according to the document-related spatial orientation of the non-imaged document feature of the security document (1) and/or a document-related spatial orientation of an imaged document feature of the projecting section (7) is determined in an image-based manner, and a cutting trajectory (11) is determined according to the document-related spatial orientation of the imaged document feature of the security document (1); and the security document (1) is cut along the cutting trajectory (11).