Micro-Optic Security Device With Structured-Light Icon Registration
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Solution Overview
Problem
Existing micro-optic security devices face challenges in achieving absolute registration between focusing elements and image icons, leading to uncertainty in the visibility of humanly visible displays at predetermined angles, which complicates anti-counterfeiting measures.
Innovation Solution
A micro-optic security device with absolute registration is achieved by applying a layer of light-curable material to a planar array of focusing elements, directing structured light at specific angles to form image icons with predetermined visibility ranges, and removing uncured material to ensure precise positioning of image icons within focusing element footprints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional micro-optic security devices are used, then visual information can be provided to create synthetic images, but absolute registration between focusing elements and image icons cannot be achieved, leading to uncertainty in visibility at predetermined angles
Solution Approach 1:
The patent applies preliminary action by pre-positioning image icons at specific locations within the footprints of focusing elements during the manufacturing process. This preliminary positioning ensures that when the device is later viewed at predetermined angles, the image icons will be correctly focused and visible, eliminating the need for post-manufacturing adjustment and ensuring reliable angular control.
Solution Approach 2:
The patent replaces conventional mechanical alignment methods with an optical approach using light-curable material and focused light beams. By directing focused light through the focusing elements onto the light-curable material, the system uses optical focusing rather than mechanical positioning to achieve precise registration between image icons and focusing elements, thereby improving angular control precision.
2Reliability
If image icons are positioned with absolute registration, then visibility at predetermined angles is controlled, but manufacturing complexity increases due to precise positioning requirements
Solution Approach 1:
The patent applies self-service by using the focusing elements themselves to perform the positioning function. The focused light beams, which are naturally directed through the focusing elements, serve dual purposes: they create the image icons and simultaneously define their precise positions. This eliminates the need for separate positioning mechanisms and reduces manufacturing complexity while maintaining reliable angular control.
Solution Approach 2:
The patent utilizes parameter changes by controlling the focus distance and beam parameters of the light used to cure the light-curable material. By adjusting these optical parameters, the system can precisely control where the image icons form within the focusing element footprints, achieving absolute registration without complex mechanical positioning systems.
3Manufacturing precision
If structured light is directed at specific angles to form image icons, then absolute registration is achieved, but manufacturing time increases due to multi-step process
Solution Approach 1:
The patent applies periodic action by using sequential directed light beams at different angles to create multiple image icons. Each beam direction corresponds to a specific viewing angle, and the process cycles through different angles to populate the entire array of focusing elements. This systematic approach maintains high precision while improving productivity compared to random or sequential single-angle methods.
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 approach enhances angular control over humanly visible displays, making it easier to detect counterfeits and create complex visual effects like 3-D and animation, thereby improving security and authenticity verification.
Implementation Method 1
directing a first pattern of structured light at a lensing surface of the planar array of focusing elements until a first portion of the layer of light-curable material is cured to form a first arrangement of image icons
Data Source
AI summary
A micro-optic security device (100) includes a planar array of micro-optic focusing elements (105) and a first arrangement of image icons (120), wherein each image icon (121) of the first arrangement of image icons includes a region of light-cured material. Further, the first arrangement of image icons is visible (320) through the planar array of micro-optic focusing elements across a first predetermined range of viewing angles relative to the micro-optic security device, and the first arrangement of image icons is not visible (360) through the planar array of micro-optic focusing elements across a second predetermined range of viewing angles relative to the micro-optic security device.