Aluminum Oxide Precursor Sol for Low-Temperature Antireflection Coatings
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Solution Overview
Problem
Existing methods for forming antireflection coatings using aluminum oxide sols face challenges such as nonuniformity and poor antireflection performance due to aggregation of organic aluminum compounds, especially when baked at low temperatures, which affects the appearance and optical properties of optical members.
Innovation Solution
A precursor sol of aluminum oxide is developed containing a polycondensate formed by the hydrolysis of aluminum alkoxide, a solvent, and an organic aluminum compound, which is applied to a base, dried, and then immersed in hot water to form a textured structure of aluminum oxide boehmite, achieving satisfactory antireflection performance even at low baking temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sol in which an organic aluminum compound is easily aggregated is applied to form a film, then the film formation process is simplified, but the film has low degree of uniformity leading to poor appearance
Solution Approach 1:
The patent introduces a specific organic aluminum compound as an intermediary substance that mediates between the sol and the film formation process. This compound has controlled aggregation properties that prevent excessive clustering while maintaining ease of application, thereby achieving both manufacturing simplicity and film uniformity
Solution Approach 2:
The patent modifies the chemical parameters of the organic aluminum compound, specifically controlling the aggregation tendency through molecular structure design. By adjusting the degree of aggregation parameter, the solution achieves optimal balance between application ease and film uniformity, resolving the contradiction between manufacturing simplicity and precision
2Reliability
If baking is performed at high temperature (200°C or higher), then the aluminum oxide film forms properly, but peripheral members and figure tolerance are adversely affected and resin bases cannot be used
Solution Approach 1:
The patent fundamentally changes the thermal parameter (baking temperature) from high temperature (200°C or higher) to low temperature (below 200°C). This parameter change is enabled by the specially designed organic aluminum compound that maintains film formation quality at lower temperatures, thereby preventing damage to heat-sensitive components and enabling resin base usage
Solution Approach 2:
The patent creates a composite system combining aluminum oxide with a specifically designed organic aluminum compound. This composite material structure allows the film to form properly at low temperatures, resolving the contradiction between film quality and thermal damage prevention
3Stability of the object's composition
If the stabilizer chelates with aluminum to form an organic aluminum compound, then the sol stability is improved, but the organic aluminum compound aggregates and inhibits bonding formation between particles
Solution Approach 1:
The patent optimizes the chemical parameters of the stabilizer and organic aluminum compound interaction. By controlling the chelation strength and molecular structure, the solution maintains sol stability while preventing excessive aggregation that would inhibit particle bonding, thus resolving the contradiction between stability and bonding reliability
Solution Approach 2:
The patent introduces local quality variations in the organic aluminum compound structure, creating regions with different aggregation tendencies. This allows the stabilizer to effectively chelate with aluminum for sol stability while specific structural features prevent excessive aggregation, maintaining particle bonding capability
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 minimizes nonuniformity and enhances antireflection performance while allowing for low-temperature baking, ensuring the optical member maintains excellent appearance and optical properties.
Implementation Method 1
a polycondensate formed by the hydrolysis of aluminum alkoxide
Implementation Method 2
applying the precursor sol on a base, drying the base
Implementation Method 3
immersing the base in hot water to form a textured structure of aluminum oxide boehmite
Data Source
AI summary
A precursor sol of aluminum oxide contains a polycondensate formed by the hydrolysis of an aluminum alkoxide or an aluminum salt, a solvent, and an organic aluminum compound having a specific structure. An optical member is produced by a process including a step of immersing an aluminum oxide film in a hot water with a temperature of 60° C. to 100° C. to form a textured structure made of aluminum oxide crystals, the aluminum oxide film being formed by feeding the precursor sol of aluminum oxide onto a base. A method for producing an optical member includes a step of immersing an aluminum oxide film in a hot water with a temperature of 60° C. to 100° C. to form a textured structure made of aluminum oxide crystals, the aluminum oxide film being formed by feeding the precursor sol of aluminum oxide onto a base.