Lenticular Security Device Unit Cell Design for Angle-Resolved Imaging
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Solution Overview
Problem
Existing lenticular security devices suffer from visual confusion due to intersections between image elements at certain viewing angles, especially when formed on flexible substrates, leading to reduced visual impact and effectiveness in security applications.
Innovation Solution
A security device featuring an array of focusing elements and image elements arranged in a unit cell configuration where the centre area is larger than outer areas, ensuring that the centre image is displayed over a greater range of viewing angles without intersections, reducing visual confusion and enhancing the overall visual impression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If image elements are arranged in a conventional lenticular device, then different images can be displayed at different viewing angles, but intersections between image elements occur at certain viewing angles causing visual confusion
Solution Approach 1:
The image elements are segmented into multiple groups, with each group assigned to a specific viewing angle range. This segmentation prevents intersections by ensuring that only image elements intended for the current viewing angle are visible, eliminating visual confusion while maintaining multi-angle display capability
Solution Approach 2:
Different regions of the device have different image element arrangements optimized for specific viewing angles. The local quality of each region is tailored to its intended viewing direction, allowing clear image display without intersections at each angle while maintaining overall versatility
2Ease of manufacture
If the device is formed on a flexible substrate, then ease of application is improved, but visual confusion increases due to intersections between image elements
Solution Approach 1:
The image elements are pre-arranged in groups corresponding to specific viewing angles during manufacturing, before the device is applied to the flexible substrate. This preliminary arrangement ensures that even when the substrate flexes, the grouped structure prevents intersections and maintains visual clarity
3Manufacturing precision
If image elements are densely packed to improve resolution, then manufacturing precision is improved, but visual confusion increases due to intersections
Solution Approach 1:
Even with dense packing, the segmentation of image elements into angle-specific groups prevents intersections. The high manufacturing precision enables accurate placement of these segmented elements, achieving both high resolution and visual clarity by maintaining group integrity throughout the dense arrangement
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 solution provides a clear, strong, static image at small tilt angles while maintaining an optically variable effect upon further tilting, improving the visual stability and security of the device by ensuring the centre image is displayed consistently over a broader angle range without interference from other images.
Implementation Method 1
an array of focusing elements, each focusing element being adapted to focus light in at least a first direction
Implementation Method 2
a magnified version of the microimage elements is generated due to the moiré effect
Data Source
AI summary
A security device has: an array of focusing elements on a grid; and an array of image elements overlapping the focusing elements array and arranged based on a repeating unit cell defining image element positions. The unit cell periodicity is substantially the same as the grid's. Each position is assigned to carry an image element of a respective corresponding image. Dependent on angle, the focusing elements array directs light from selected positions, as the device is tilted different ones of the respective images are displayed by the elements at the selected positions in combination, sequentially. Each unit cell center area, larger than each outer area, is assigned to carry element(s) of a corresponding center image, the outer areas assigned to carry element(s) of other respective images, such that the range of viewing angles over which the center image is displayed is greater than that over which each other image is.