Acrylate Optical Material for Wafer Level Camera Modules
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Solution Overview
Problem
Current optical materials for wafer level camera modules lack high temperature resistance and sufficient anti-yellowing properties, particularly under reflow soldering conditions, making them unsuitable for mass production due to yellowing issues and insufficient mechanical performance.
Innovation Solution
An acrylate-based optical material composition incorporating an inorganic phosphorus-containing acid or phosphate as an anti-yellowing agent, along with an initiator, which provides high-temperature resistance and reflowability, similar to glass materials, while maintaining sufficient transmittance and preventing yellowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional plastic materials are used for lens manufacturing, then ease of manufacture is improved, but temperature resistance deteriorates
Solution Approach 1:
The patent employs a composite material system consisting of acrylic resin as the base material, combined with specific additives including anti-yellowing agents (phosphorus compounds, hindered phenols, hindered amines), UV absorbers, and polymerization inhibitors. This composite approach allows the material to achieve both ease of manufacture through injection molding and improved temperature resistance by incorporating functional additives that stabilize the material under thermal stress during reflow soldering processes.
2Object-affected harmful factors
If anti-oxidant additives are added to inhibit yellowing, then yellowing inhibition is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent carefully controls the concentration parameters of anti-oxidant additives to optimize both yellowing inhibition and manufacturing precision. Specifically, it employs phosphorus compounds at 0.01-5 wt%, hindered phenols at 0.1-5 wt%, and hindered amines at 0.1-5 wt% relative to the total composition. This precise parameter control ensures sufficient yellowing protection while maintaining the material's flow characteristics and molding precision during injection molding and reflow processes.
Solution Approach 2:
The patent uses a composite anti-oxidant system combining multiple types of additives (phosphorus compounds, hindered phenols, hindered amines, UV absorbers) that work synergistically. This composite approach provides comprehensive yellowing inhibition through multiple mechanisms while the balanced formulation maintains proper material viscosity and flow properties for precise manufacturing.
3Reliability
If high temperature resistance is improved for reflow soldering, then reliability is improved, but yellowing resistance deteriorates
Solution Approach 1:
The patent employs a composite material system consisting of acrylic resin as the base material, combined with specific additives including anti-yellowing agents (phosphorus compounds, hindered phenols, hindered amines), UV absorbers, and polymerization inhibitors. This composite approach allows the material to achieve both high temperature resistance for reliable reflow soldering and yellowing resistance through the synergistic action of multiple stabilizing additives that protect against thermal and oxidative degradation.
Solution Approach 2:
The patent optimizes the concentration parameters of temperature-resistant additives to ensure both reliability and yellowing resistance. The specified ranges (phosphorus compounds: 0.01-5 wt%, hindered phenols: 0.1-5 wt%, hindered amines: 0.1-5 wt%) are designed to provide sufficient thermal stability during reflow soldering while preventing yellowing through coordinated antioxidant and UV protection mechanisms.
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 composition achieves high-temperature resistance and reflowability, preventing yellowing and ensuring the optical material's performance in wafer level camera modules, facilitating automated assembly and reducing production costs by simplifying the manufacturing process.
Implementation Method 1
The free radical scavenger is mainly a hindered phenol compound and a hindered amine compound... molecular chain scission in a polymeric material at a high temperature may generate free radicals, and these free radicals may react with other surrounding molecular chains and cause further molecular chain scission
Implementation Method 2
a peroxide decomposer that decomposes a generated peroxide into inert substances to inhibit generation of a new free radical... the peroxide decomposer is mainly a phosphorus compound
Implementation Method 3
a free radical scavenger that traps a generated free radical and makes the free radical ineffective... The free radical scavenger is mainly a hindered phenol compound and a hindered amine compound
Implementation Method 4
the lens material used must have properties similar to glass materials, i.e. high temperature resistance and reflowability... Because the wafer level camera module is installed by using a reflow soldering method
Data Source
AI summary
The present invention provides an optical material composition, including: (a) an acrylate-based material; (b) an anti-yellowing agent, selected from the group consisting of an inorganic phosphorus-containing acid, a phosphate and a combination thereof; and (c) an initiator. After being cured, the composition of the present invention has good transmittance, anti-yellowing performance and high-temperature resistance.