Visible-Light Barrier with Light-Scattering Layer for IR Devices
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Solution Overview
Problem
Conventional IR device enclosures are limited in color customization options and often use dark black materials that absorb visible light, making transparent covers unsuitable due to optical interference and mechanical limitations, while colored pigments that block visible light also block unacceptable amounts of IR light, rendering devices unsuitable for tracking and communication purposes.
Innovation Solution
The use of multilayered visible-light barriers with light-scattering layers, comprising titanium dioxide or zinc oxide particles, that preferentially scatter visible light while allowing infrared light to pass through, providing customizable color options and preventing optical interference while maintaining effective IR transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional dark black materials are used to block visible light, then visible light transmission is blocked, but infrared light transmission is also blocked making devices unsuitable for tracking and communication
Solution Approach 1:
The patent divides the barrier function into separate layers: a first layer (such as a polymer substrate) that blocks visible light, and a second layer (such as metal oxide particles like TiO2 or ZnO) that selectively transmits infrared light while scattering visible light. This segmentation allows each layer to optimize for its specific function without compromising the other.
Solution Approach 2:
The patent uses composite materials combining a polymer matrix with dispersed metal oxide particles (TiO2 or ZnO). This composite structure provides both the visible light blocking capability of the polymer and the infrared transmission properties of the metal oxide particles, resolving the contradiction between visible light blocking and infrared transmission.
2Adaptability or versatility
If colored pigments are used to provide color customization, then visible light is blocked providing color options, but infrared light transmission is blocked rendering devices unsuitable for tracking
Solution Approach 1:
The patent employs metal oxide particles (TiO2, ZnO) that provide specific color appearances (white, gray, or translucent) through light scattering rather than absorption. These particles scatter visible light to create color effects while maintaining infrared transmission, unlike conventional pigments that absorb both visible and infrared light.
Solution Approach 2:
The patent changes the optical parameters of the barrier material by using particles with specific size ranges (0.1-10 micrometers for TiO2, 0.5-5 micrometers for ZnO) and controlling their concentration (0.1-10 wt%). These parameter changes enable selective scattering of visible light while maintaining infrared transmission, achieving color customization without compromising IR functionality.
3Adaptability or versatility
If transparent covers are used for device enclosures, then aesthetic appeal is improved, but optical interference occurs and mechanical limitations arise
Solution Approach 1:
The patent applies a light-scattering coating containing metal oxide particles to the transparent cover surface. This coating provides color appearance (white, gray, or translucent effects) and blocks visible light while maintaining infrared transmission, eliminating the need for fully opaque black covers and reducing optical interference issues.
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 offers additional color options for IR device enclosures, obscures internal components, and prevents optical interference, while ensuring consistent and visually appealing coloration over the exterior surface without significantly impacting IR light transmission, thus enhancing the aesthetic and functional appeal of IR devices.
Implementation Method 1
a light-scattering layer that preferentially scatters visible light over infrared light
Data Source
AI summary
The disclosed visible-light barrier may include a light-scattering layer that preferentially scatters visible light over infrared light. The light-scattering layer may include (1) a substantially transparent or translucent material and (2) at least one of TiO2 or ZnO particles dispersed within the substantially transparent or translucent material at a concentration of from approximately 0.02 wt % to approximately 2 wt %. Various other articles, devices, systems, and methods are also disclosed.