Optical Security Layer Layout for Smooth Color-Shift Imaging
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Solution Overview
Problem
Existing optical security devices have limitations in producing smooth color transitions and are susceptible to counterfeiting due to snap effects when viewing angles change.
Innovation Solution
The method involves forming an optical security device with a sacrificial arrangement of focusing elements over image icon elements, directionally curing contrasting materials at specific angles, and integrating a fixed arrangement of focusing elements to create a lens-icon mismatch, allowing for smoother color transitions by projecting multiple contrasting material patterns at various viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-directional curing is used to form color blocks, then manufacturing is simplified and large color blocks are formed, but color transitions become difficult to achieve and control
Solution Approach 1:
The patent applies directional curing at specific angles to dynamically control which color blocks are activated. By varying the curing angle, the system can selectively cure different portions of the color blocks, enabling smooth color transitions and dynamic visual effects that are not achievable with static non-directional curing.
Solution Approach 2:
The patent changes the curing parameter from non-directional to directional curing at specific angles. This parameter change enables precise control over which color blocks are cured and when, allowing for smooth color transitions and complex visual effects while maintaining manufacturing simplicity.
2Reliability
If multiple contrasting materials are used to produce diverse visual effects, then security against counterfeiting is improved, but alignment precision requirements increase manufacturing complexity
Solution Approach 1:
The patent applies multiple contrasting materials to the micro-structured layer before the focusing element array is formed. This preliminary action allows the materials to be positioned and cured in a controlled manner, reducing the alignment precision requirements that would otherwise be needed during final assembly.
Solution Approach 2:
The patent integrates multiple contrasting materials within the micro-structured layer, nesting them in a hierarchical arrangement. This nesting approach allows multiple materials to be incorporated without requiring precise alignment during final assembly, as they are already positioned relative to each other within the layered structure.
3Manufacturing precision
If directional curing at specific angles is used, then color transition smoothness is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent uses periodic directional curing at specific angles to achieve smooth color transitions. By applying curing light at predetermined angles and positions, the system can systematically cure different portions of the color blocks, creating smooth transitions without requiring complex continuous adjustment mechanisms.
Solution Approach 2:
The patent introduces an intermediary curing process that uses directional light at specific angles as a mediator between the manufacturing process and the final visual effect. This intermediary approach allows precise control over color transitions while simplifying the overall manufacturing process by using a controlled curing mechanism rather than complex real-time adjustment.
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 resulting optical security device achieves a smooth color-transition effect without snap effects, enhancing security by making it difficult for counterfeiters to replicate the dynamic visual effects.
Implementation Method 1
forming a first contrasting material pattern and a second contrasting material pattern on or in the image icon elements by directionally curing, through the sacrificial arrangement of focusing elements, at least the first contrasting material on or in the image icon elements
Implementation Method 2
providing at least one synthetic image that demonstrates a color-transition effect as points of view from which the optical security device is viewed are changed
Data Source
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AI summary
An optical security device suitable for securing or authenticating high security or high value articles of manufacture when affixed thereto, is provided. The inventive security device produces optically variable effects when viewed from varying points of view and is made up of a microstructured layer having image icon elements that have at least one pigmented material. The microstructured layer is arranged relative to an arrangement of focusing elements such that at least portions of the image icon elements are observable through at least portions of the arrangement of focusing elements, thereby providing at least one synthetic image that demonstrates a color-transition effect as points of view from which the optical security device is viewed are changed. In one particular embodiment, the optical security device comprises (i) an arrangement of image icon elements having a first contrasting material pattern and a second contrasting material pattern; (ii) a fixed arrangement of focusing elements disposed relative to the arrangement of image icon elements such that the image icon elements project a synthetic image when viewed through the focusing elements, and having a first fixed org-pattern (as defined herein) that is mismatched from the at least one of the patterns of the first and second contrasting materials; where the synthetic image is a projection of both the first and second contrasting material when viewed from at least one angle.