Acrylate Coating for Optical Filter Shatter Protection
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Solution Overview
Problem
Advanced laser eye protection devices with brittle optical filters face issues of shattering upon impact, leading to potential eye hazards and damage, and traditional protective methods increase device thickness and weight, or complicate optics with inaccurate cover plate bonding.
Innovation Solution
A radiation-curable acrylate-based protective coating is applied directly to the optical filter, providing a flexible layer that retains the filter upon impact, eliminating the need for an additional interior lens and reducing weight and thickness, while maintaining optical clarity and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional protective methods (additional interior lens or cover plate) are used, then protection against shattering is improved, but device thickness and weight increase
Solution Approach 1:
The patent combines the protective function with the existing optical filter by applying a protective coating directly to it, merging two functions (protection and optical filtering) into a single integrated component, thereby eliminating the need for separate protective elements that would add weight
Solution Approach 2:
The patent uses a thin film protective coating applied to the optical filter, which provides protection without the substantial weight increase associated with traditional rigid cover plates or interior lenses
2Reliability
If traditional protective methods (cover plate bonding) are used, then protection against shattering is improved, but optical complexity increases due to inaccurate bonding
Solution Approach 1:
The protective function is merged with the optical filter itself through direct coating, eliminating the need for separate cover plates and their associated bonding processes, thereby simplifying the optical system
Solution Approach 2:
The patent extracts the protective function from separate components (cover plates) and integrates it directly into the optical filter, removing the complexity of inter-component bonding and alignment
3Reliability
If acrylate-based protective coating is applied, then protection against fragment release is improved, but coating application complexity increases
Solution Approach 1:
The patent replaces mechanical bonding processes with a chemical/radiation-based curing process, where the acrylate coating is applied and then cured through radiation, simplifying the manufacturing process compared to traditional mechanical assembly methods
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 acrylate-based coating effectively prevents fragment release from a damaged optical filter, ensuring user safety and maintaining device integrity without adding bulk or complicating the optics, as demonstrated by successful impact tests under ANSI Z87.1 standards.
Implementation Method 1
A radiation-curable acrylate-based protective coating is applied directly to the optical filter
Data Source
AI summary
An optically transparent device includes an exterior lens and an optical filter coupled to an inner surface of the exterior lens. A protective coating comprised of an acrylate may be coupled to an inner surface of the optical filter to reduce fragments of the optical filter from detaching from the exterior lens.