Silicon Carbide AR Lens Coating for Heat Dissipation and Eye Protection
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Solution Overview
Problem
Existing augmented reality optical lenses face challenges in heat dissipation, leading to potential eye damage from infrared thermal radiation and lack of UV and blue light protection, compromising device miniaturization, battery life, and wearing comfort.
Innovation Solution
An augmented reality optical lens using silicon carbide with differentiated optical thin-film structures on both sides, incorporating infrared radiation and reflection layers, and a thermally conductive tape for efficient heat dissipation and eye protection, regulating thermal radiation direction and blocking harmful light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If silicon carbide lens with identical radiation-enhancing thin films is coated on both sides, then heat dissipation efficiency is improved, but human eyes are exposed to strong infrared thermal radiation causing damage
Solution Approach 1:
The patent applies different optical thin-film structures to different sides of the silicon carbide lens. The environment-facing side has radiation-enhancing films for heat dissipation, while the eye-facing side has protective films that block infrared radiation. This local differentiation allows simultaneous achievement of efficient heat dissipation and eye protection.
Solution Approach 2:
The optical thin-film structure is segmented into functionally distinct layers: radiation-enhancing films (e.g., titanium dioxide, hafnium dioxide) on the environment side for heat dissipation, and protective films (e.g., magnesium fluoride, aluminum oxide) on the eye side for blocking harmful infrared radiation while maintaining visibility.
2Temperature
If traditional heat dissipation methods like fan cooling are used, then heat dissipation capability is improved, but device volume and weight increase
Solution Approach 1:
The patent replaces mechanical fan cooling systems with a passive thermal radiation-based heat dissipation system. By coating the silicon carbide lens with radiation-enhancing optical thin films, heat is dissipated through infrared radiation without requiring moving parts, fans, or additional mechanical cooling components.
Solution Approach 2:
The patent changes the thermal radiation parameters of the lens by applying optical thin films with specific emissivity characteristics. The radiation-enhancing films increase infrared emissivity in the atmospheric window band (8-14 μm), enabling efficient passive heat dissipation through thermal radiation without mechanical intervention.
3Temperature
If metal heat sinks are used for heat dissipation, then heat conduction is improved, but device complexity and wearing comfort are compromised
Solution Approach 1:
The silicon carbide lens serves multiple functions simultaneously: it acts as the optical element for augmented reality display and as a heat dissipation component through its high thermal conductivity and radiation-enhancing optical thin films. This eliminates the need for separate metal heat sinks and reduces device complexity.
Solution Approach 2:
The patent merges the optical lens function and heat dissipation function into a single integrated component. The silicon carbide lens combines high thermal conductivity for heat conduction with radiation-enhancing optical thin films for thermal radiation, consolidating multiple heat dissipation mechanisms into one element.
4Temperature
If optical thin films are used to enhance infrared radiation, then heat dissipation is improved, but UV and blue light protection is not provided
Solution Approach 1:
The optical thin films applied to the silicon carbide lens provide multiple protective functions simultaneously: they enhance infrared thermal radiation for heat dissipation while also blocking harmful UV and blue light wavelengths. This multi-functional approach addresses both thermal management and ocular protection needs.
Solution Approach 2:
The optical thin-film structure is designed with wavelength-selective properties: radiation-enhancing films (e.g., titanium dioxide, hafnium dioxide) enhance infrared emission for heat dissipation, while protective films (e.g., magnesium fluoride, aluminum oxide) selectively block UV and blue light wavelengths that are harmful to the eyes, allowing visible light transmission.
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 effectively dissipates heat, reduces eye exposure to infrared radiation, blocks UV and blue light, enhances device compactness, and extends battery life, ensuring safe and comfortable daily use.
Implementation Method 1
utilizing a thermal conductivity of silicon carbide for heat exchange and dissipation with surrounding air
Implementation Method 2
optical thin films are used to regulate a direction of infrared radiation, so that the heat radiates away from the human eye in an atmospheric window band
Implementation Method 3
the optical thin-film structure on a side facing a human eye sequentially includes an infrared radiation layer, an infrared reflection layer
Implementation Method 4
the infrared radiation layer facing the environment has an infrared emissivity of above 0.5 in the atmospheric window band
Implementation Method 5
both of the infrared radiation layers have a transmittance of above 0.55 in a wavelength range from 455 nm to 700 nm and of no more than 0.7 in a wavelength range from 200 nm to 380 nm, and block over 5% of blue light in a wavelength range from 380 nm to 455 nm
Data Source
AI summary
The present disclosure provides an augmented reality optical lens with eye protection function and a preparation method therefor, addressing the issues of heat dissipation and eye protection in head-mounted display devices. The lens uses silicon carbide as a substrate, with specific optical thin-film structures on both sides. When the device generates heat, a heating element is connected to the lens by means of a thermally conductive tape, and the heat is dissipated by utilizing a thermal conductivity of silicon carbide. Heat dissipation is enhanced through heat exchange with air and by regulating a direction of infrared radiation, preventing human eyes from thermal radiation. The present disclosure integrates heat dissipation and eye protection functions, features a simple process and high yield, meets the demands for miniaturization, long battery life, and eye protection in head-mounted devices, enhances user experience, and promotes the development of augmented reality technology devices.