Security Document Lenses with Offset Pitch for Remote Authentication
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Solution Overview
Problem
Existing security documents require high precision for aligning image patterns with lens structures, making them difficult to produce and authenticate remotely, and necessitate the holder's image to be applied at the production site, complicating logistics.
Innovation Solution
The security document features lenses spaced at a different distance than the image elements, allowing for partial coverage of the image area with lenses formed within a contour that displays holder or issuing authority information, enabling easy authentication and personalization at a remote location without precise alignment, using methods like laser ablation or imprinting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lenses are formed at the production site with precise alignment to image patterns, then security document authenticity is ensured, but manufacturing complexity and logistics are increased
Solution Approach 1:
The image pattern is pre-formed in the base layer at the production site, while the lenses are formed later at a remote completion site. This preliminary preparation of the base layer with embedded image elements allows the document to be authenticated and personalized remotely without requiring the holder's image to be physically present at production, thus reducing logistics complexity while maintaining authentication security.
Solution Approach 2:
The security document manufacturing process is segmented into two independent stages: (1) production at the manufacturing site where the base layer with image pattern is created, and (2) completion at a remote site where lenses are formed. This segmentation allows different locations to perform specialized functions independently, reducing the need for complex logistics and precise alignment while maintaining security.
2Ease of manufacture
If holder image is applied at production site, then document personalization is achieved, but logistics complexity increases due to image forwarding requirements
Solution Approach 1:
The base layer is prepared in advance with generic image patterns or placeholder elements embedded within it. The actual personalization with holder-specific images occurs later at the completion site through lens formation, eliminating the need to forward holder images to production sites and reducing logistics time while maintaining ease of personalization.
3Measurement precision
If precise alignment between image pattern and lens structure is required, then authentication accuracy is improved, but ease of operation is reduced
Solution Approach 1:
The image elements are embedded within localized contours (such as text contours or geometric shapes) in the base layer. When lenses are formed over these contours at the completion site, the optical effect is confined to these local regions. This local containment means that precise global alignment is not required, as each local contour provides its own reference frame, improving ease of operation while maintaining authentication 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
This solution provides improved security features with flexible production and authentication processes, allowing for secure and efficient personalization and authentication of security documents, such as identity cards, without the need for precise alignment, and enables unique lens patterns for each document.
Implementation Method 1
the lenses are formed by an array of spherical lenses in the image area, the image area comprising an array of image elements having a pitch that is different from the pitch of the lenses, resulting in an Moiré magnification of the image which is viewed below or above the image elements in the plastics material
Implementation Method 2
The array of lenses is provided in a plastics material layer by laser ablation of the plastics material
Data Source
AI summary
Disclosed is a security document including an image area, a repeating image pattern in the image area of mutually spaced image elements at a mutual distance D and a layer of a plastics material overlying the image area and an array of lenses in the plastics material. The lenses are spaced at a mutual distance L which may be equal to D or which may differ from D, the array of lenses overlying only a part of the image area surface and are formed in the plastics material within an image contour. Within the contour an image may be observed such as a Moiré magnification or a Moiré effect of light and dark stripes. The lenses may be formed for instance by laser ablation or by imprinting.