Optical Prism for Laser Marking Security Documents
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Solution Overview
Problem
Existing devices for writing flip images on security documents are complex, cumbersome, and require multiple deflection mirrors, making them less flexible and larger in size.
Innovation Solution
A personalization module that includes a laser marking module with a movable optical prism and a transport mechanism, allowing for the marking of two-image elements on security documents using a single optical system, which is more flexible and compact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple deflection mirrors are used to write flip images on security documents, then the marking capability is achieved, but the device complexity and size increase
Solution Approach 1:
The patent combines multiple deflection mirror functions into a single rotating polygonal mirror. The polygonal mirror integrates multiple reflective surfaces that can sequentially direct the laser beam to different areas of the document, replacing what would traditionally require multiple separate mirrors and complex switching mechanisms.
Solution Approach 2:
The rotating polygonal mirror serves multiple functions: it acts as both a beam deflector and a scanning mechanism, and can mark different image elements (first and second images) on the security document through rotational positioning. This single component performs what would otherwise require multiple specialized components.
2Volume of moving object
If a single optical system with movable prism is used, then the device size is reduced, but the flexibility in marking different image elements must be maintained
Solution Approach 1:
The patent employs a movable prism that can be dynamically repositioned along the optical path. This dynamic positioning allows the single optical system to adaptively mark different image elements on the security document by adjusting the prism's position, maintaining flexibility while avoiding the need for multiple fixed optical systems.
Solution Approach 2:
The movable prism acts as an intermediary optical element that redirects the laser beam to different target areas. By positioning the prism at different locations in the optical path, the system can selectively mark the first image element, the second image element, or both, providing versatility through a single mediating component.
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 efficient and flexible personalization of security documents with a compact device, capable of marking both MLI and CLI elements without the need for multiple mirrors, thus improving usability and reducing size.
Implementation Method 1
An optical prism (300), configured to refract the laser beam (520) from the laser scanner mirrors to the lenticular lenses
Implementation Method 2
a laser marking module (500), configured to mark within a marking zone, and comprising a laser head (530) configured to emit a laser beam (520)
Data Source
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Figure 3
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AI summary
The invention relates to a personalization module (100), for personalization of a security document (200) comprising a marking area for marking a two-image element MLI or CLI through an array (210) of lenticular, said personalization module (100) comprising: - a laser marking module (500), configured to mark within a marking zone, and comprising a laser head (530) configured to emit a laser beam (520), and a laser scanner equipped with movable mirrors to deflect said laser beam (520) towards said document (200), Characterized in that it further comprises: - An optical prism (300), configured to refract the laser beam (520) from the laser scanner mirrors to the lenticular lenses, one side of the prism (300) enabling marking a first image element of the MLI or the CLI, the other side of the prism (300) enabling marking a second image element of the MLI or the CLI.