Aromatic Polyether Optical Filter Substrate Heat Resistance
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Solution Overview
Problem
Conventional optical filters used in imaging devices face challenges with low light transmittance, insufficient heat resistance, and mechanical strength, particularly due to the low glass transition temperature of materials like PET and PEN, which affects their performance and durability.
Innovation Solution
An optical filter comprising a substrate made of an aromatic polyether-based polymer with a specific glass transition temperature range (230-350°C) and a dielectric multilayer film, providing superior heat coloration resistance and mechanical strength, while maintaining high light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional resins (PET, PEN, norbornene-based) are used for the substrate, then ease of manufacture is improved, but heat resistance deteriorates due to low glass transition temperature (70-180°C)
Solution Approach 1:
The patent changes the fundamental parameter of glass transition temperature by selecting a specific polymer material (polymer B) with Tg of 200°C or higher, thereby resolving the contradiction between ease of manufacture and heat resistance. This parameter change enables the substrate to withstand high-temperature processing while maintaining manufacturability.
Solution Approach 2:
The patent employs a composite approach by combining polymer B with specific additives (polymer C at 5-50 wt% and polymer D at 5-50 wt%) to create a substrate material that achieves both high heat resistance and good processability. The composite formulation balances thermal properties with manufacturing characteristics.
2Ease of manufacture
If conventional resins (PET, PEN, norbornene-based) are used for the substrate, then ease of manufacture is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the polymer to 10,000-1,000,000, which optimizes the balance between mechanical strength and processability. This parameter adjustment ensures the substrate has sufficient strength while remaining manufacturable.
Solution Approach 2:
The patent uses a composite material system combining polymer B with polymers C and D in specific ratios (5-50 wt% each) to achieve optimal mechanical strength. The synergistic combination provides both strength and ease of manufacture.
3Temperature
If the substrate material has high heat resistance, then heat coloration resistance is improved, but light transmittance may deteriorate
Solution Approach 1:
The patent carefully controls the glass transition temperature parameter within a specific range (200-400°C, preferably 230-350°C) to balance heat resistance and light transmittance. This optimized parameter range ensures high-temperature stability while maintaining optical clarity.
Solution Approach 2:
The patent applies local quality by using a transparent polymer material (polymer B) with specific optical properties that maintain high light transmittance in the visible range while providing the required heat resistance. The material's local optical characteristics are optimized for imaging device applications.
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 optical filter achieves enhanced light transmittance, heat resistance, and mechanical strength, preventing coloration and degradation under elevated temperatures, making it suitable for imaging devices.
Implementation Method 1
the substrate comprises an aromatic polyether-based polymer having a glass transition temperature (Tg), measured via differential scanning calorimetry (DSC, heating rate: 20° C./min), of from 230 to 350° C.
Implementation Method 2
a dielectric multilayer film formed on at least one surface of the substrate
Data Source
AI summary
An optical filter comprising a substrate and a dielectric multilayer film formed on at least one surface of the substrate, wherein the substrate comprises an aromatic polyether-based polymer having a glass transition temperature (Tg), measured via differential scanning calorimetry (DSC, heating rate: 20° C./min), of from 230 to 350° C.