Volume Hologram with Lenticular Lens for Anti-Copy Security
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Solution Overview
Problem
Existing holograms, particularly surface holograms, can be easily copied using techniques like embossing, while volume holograms are difficult to copy but can be replicated optically, lacking a reliable method to prevent unauthorized duplication.
Innovation Solution
A volume hologram design incorporating a holographic medium with interlaced optical interference structures and a lenticular lens layer featuring an array of lenticules, which replays different images at varying angles and wavelengths, making it difficult to copy by exploiting the complexity of the interlaced and encrypted data within a smaller medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If surface holograms are used, then ease of manufacture is improved, but security against copying deteriorates
Solution Approach 1:
The patent transitions from surface holograms (2D) to volume holograms (3D), embedding optical interference structures within the bulk of the holographic medium. This dimensional change prevents copying because the internal volume structures cannot be replicated by surface embossing techniques, thereby improving security while maintaining manufacturability through direct volume recording methods
2Reliability
If volume holograms are used, then security against copying is improved, but ease of optical replication deteriorates
Solution Approach 1:
The volume hologram is segmented into multiple distinct optical interference structures, each encoding different data or images. These segmented structures are distributed throughout the volume of the holographic medium, making optical replication extremely difficult because copying would require perfect replication of all three-dimensional segments simultaneously, which is practically impossible with current optical copying techniques
3Reliability
If multiple interlaced images are incorporated, then security is improved, but device complexity increases
Solution Approach 1:
Multiple interlaced images and optical interference structures are merged into a single integrated volume holographic medium. The different images and data sets are combined in three-dimensional space within the same medium, creating a unified security feature that requires sophisticated multi-angle or multi-wavelength illumination to decode, thereby enhancing security without requiring multiple separate physical components
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
The hologram design enhances security by requiring precise reconstruction of multiple interlaced images, making optical copying more challenging and providing a secure means for authentication and verification, while reducing the material needed for a given image size, thus offering environmental benefits and increased security.
Implementation Method 1
a first optical interference structure which upon illumination replays a first image
Implementation Method 2
volume hologram including a holographic medium... the holographic medium including a first optical interference structure
Implementation Method 3
a lenticular lens layer including an array of lenticules... first and second interlaced images corresponding with the array of lenticules
Data Source
AI summary
There are provided volume holograms and combinations of lenticular lenses and holograms in particular for security applications. In embodiments, a volume hologram comprises a holographic medium (102) including a first optical interference structure which, upon illumination, replays a first image (110); wherein the first image includes a lenticular lens layer (111) including an array of lenticules and a lenticular image layer (113) including first (114) and second (115) interlaced images corresponding with the array of lenticules.