Security Device with Segmented Focusing Elements
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Solution Overview
Problem
Existing security devices for documents, such as banknotes and passports, face challenges in providing distinct visual effects that are difficult to counterfeit while maintaining simplicity and cost-effectiveness, as they often require complex manufacturing processes and high registration accuracy between focusing elements and image elements.
Innovation Solution
A security device featuring an array of focusing elements arranged on a regular two-dimensional grid, combined with elongate image elements that change direction in different regions, allowing for distinct visual effects without the need for precise registration between focusing and image element arrays, enabling a simpler construction method that maintains strong visual impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional lenticular devices use cylindrical lenses arranged in one direction, then they can display different images at different viewing angles, but they cannot provide distinct visual effects when tilted in multiple directions and require precise registration between lens and image element arrays
Solution Approach 1:
The device is divided into multiple regions, each containing focusing elements and image elements with different orientations. This segmentation allows each region to independently respond to tilting in different directions, providing versatile visual effects without requiring precise registration across the entire device.
Solution Approach 2:
Different regions of the device have locally optimized properties: first region has focusing elements and image elements oriented in a first direction for response to tilting in that direction, while second region has them oriented in a second direction for response to tilting in the orthogonal direction. This local quality differentiation enables multi-directional visual effects without complex global registration requirements.
2Adaptability or versatility
If moiré magnifier devices use synthetic magnification with micro-focusing elements and microimage elements, then they generate magnified images, but they cannot display animation or multiple images at different angles like lenticular devices
Solution Approach 1:
The device divides the image element array into multiple regions with different orientations, where each region can display different images or visual effects. This segmentation enables versatile image display capability including animation and multi-angle viewing without requiring precise pitch matching across the entire device, as each region operates independently.
Solution Approach 2:
The device enables dynamic visual effects by allowing different regions to respond differently to device tilting. When tilted in different directions, different regions become active, creating animation-like effects and displaying multiple images sequentially, transforming a static magnification device into a dynamic multi-state display system.
3Manufacturing precision
If security devices use complex manufacturing processes to achieve high registration accuracy, then they can produce precise optically variable effects, but they increase manufacturing costs and complexity
Solution Approach 1:
By dividing the device into regions with different orientations, the patent relaxes the registration accuracy requirements. Each region can be manufactured and aligned independently with less stringent precision requirements, significantly simplifying the manufacturing process while still achieving the desired optically variable effects in multiple directions.
Solution Approach 2:
The device achieves multi-functionality by incorporating regions with different orientations that respond to tilting in different directions. This universal design allows a single device to provide multiple visual effects and security verification modes without requiring multiple separate components or complex assembly processes, reducing overall manufacturing complexity.
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 cost-effective and robust security device that exhibits different visual effects when tilted, enhancing authenticity verification while reducing manufacturing complexity and costs.
Implementation Method 1
an array of focusing elements, each focusing element being adapted to focus light in any direction in the plane of the security device
Implementation Method 2
the array of micro-focusing elements cooperates with the array of microimage elements to generate a magnified version of the microimage elements due to the moiré effect
Data Source
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AI summary
A security device is disclosed, comprising: an array of focusing elements, each focusing element being adapted to focus light in at least two orthogonal directions, the focusing elements being arranged on a regular two-dimensional grid; and an array of elongate image elements overlapping the array of focusing elements, configured such that each focusing element can direct light from any one of a respective set of at least two elongate image elements to the viewer, in dependence on the viewing angle. In a first region of the security device, the elongate image elements extend along a first direction, and in a second region of the security device, the elongate image elements extend along a second direction which is different to the first direction.