Optical Lens Assembly Coating for Thermal-Stable Anti-Reflection
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Solution Overview
Problem
Conventional anti-reflective membrane layers in optical modules experience relative displacement and detachment due to thermal expansion differences, affecting image quality and stability under temperature changes.
Innovation Solution
An optical lens assembly with a glass lens element featuring a non-planar optical surface and an anti-reflective membrane layer comprising a nanostructure layer made of aluminum oxide and a structure connection film of silicon dioxide, which has a thickness between 20 nm and 150 nm, ensuring a linear expansivity of 12×10−7/K to 210×10−7/K, reducing relative displacement and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional anti-reflective membrane layer is used on the optical surface, then reflection is reduced and image quality is improved, but thermal expansion difference causes relative displacement and layer detachment under temperature changes
Solution Approach 1:
The patent changes the material parameter of the anti-reflective membrane layer from conventional materials to silicon oxide, which has a specific linear expansivity of 12×10−7/K to 210×10−7/K. This parameter change enables the membrane layer to match the thermal expansion characteristics of the glass lens element, eliminating relative displacement while maintaining the anti-reflection function.
Solution Approach 2:
The patent employs a composite structure consisting of a glass lens element and a silicon oxide anti-reflective membrane layer. The composite material approach allows the membrane layer to be integrated with the lens element, ensuring compatible thermal expansion behavior and preventing detachment under temperature variations while maintaining optical performance.
2Reliability
If the anti-reflective membrane layer material is changed to reduce thermal expansion difference, then layer stability is improved, but the anti-reflection performance may be affected
Solution Approach 1:
The patent optimizes the linear expansivity parameter of the silicon oxide membrane layer to fall within the range of 12×10−7/K to 210×10−7/K. This parameter optimization ensures both thermal compatibility with the glass lens element and maintained anti-reflection performance across temperature variations.
Solution Approach 2:
The patent applies the silicon oxide membrane layer specifically on the optical surface of the glass lens element where anti-reflection is most critical. The local application of this specialized material ensures that the thermal expansion characteristics are optimized at the interface while maintaining the overall optical performance of the lens assembly.
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 enhances the stability and reduces layer detachment, maintaining imaging quality by minimizing thermal expansion-induced displacement and reflection, thus improving the performance of optical modules in varying temperatures.
Implementation Method 1
the difference of thermal expansivity between the conventional anti-reflective membrane layer and the substrate is large, so a relative displacement occurs at the interface between the conventional anti-reflective membrane layer and the substrate due to temperature changing
Implementation Method 2
an anti-reflective membrane layer is formed on the optical surface, and the anti-reflective membrane layer includes a nanostructure layer and a structure connection film
Data Source
AI summary
An optical lens assembly includes a glass lens element. The glass lens element has a refractive power, an optical surface of the glass lens element is non-planar, an anti-reflective membrane layer is formed on the optical surface, and the anti-reflective membrane layer includes a nanostructure layer and a structure connection film. The nanostructure layer has a plurality of ridge-like protrusions extending non-directionally from the optical surface, and a material of the nanostructure layer includes aluminum oxide. The structure connection film is disposed between the optical surface and the nanostructure layer, the structure connection film includes at least one silicon dioxide layer, the at least one silicon dioxide layer contacts a bottom of the nanostructure layer physically, and a thickness of the at least one silicon dioxide layer is greater than or equal to 20 nm and less than or equal to 150 nm.