Thermosetting Plastic Optical Element Casting for Spectral Control
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Solution Overview
Problem
Existing methods for manufacturing optical elements using thermoplastic and thermosetting plastics for eye-protecting devices and vision correction tools face challenges such as suboptimal optical characteristics due to material limitations and injection molding deformations, as well as high costs and defects from laminate integration, particularly with thermosetting materials.
Innovation Solution
A method involving a self-supporting layer of partially cross-linked thermosetting plastic with a polymerisable layer that incorporates reactive functional groups and a chemical compound to modify spectral characteristics, cross-linked in a mould to form a solid monolithic optical element with improved optical and cost-effective properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermoplastic materials are used for manufacturing optical elements, then lightness and impact resistance are improved, but optical characteristics deteriorate due to material limitations and injection molding deformations
Solution Approach 1:
The patent changes the material parameter from thermoplastic to thermosetting plastic, which fundamentally alters the manufacturing process from injection molding to casting. This parameter change eliminates molding deformations and improves optical characteristics while maintaining impact resistance through the inherent properties of thermosetting materials
Solution Approach 2:
The patent replaces the mechanical injection molding process with a chemical casting process. Instead of forcing molten material into a mold under high pressure (mechanical system), the material is cast in a liquid state and cured chemically, eliminating mechanical deformations and improving optical precision
2Manufacturing precision
If a functionalised layer is inserted in the optical element during injection molding, then spectral characteristics are improved, but manufacturing complexity and defects increase due to laminate integration issues
Solution Approach 1:
The patent merges the functional layer with the bulk material by incorporating the spectral modification compound directly into the thermosetting plastic matrix. This eliminates the separate laminate structure and its associated integration issues, simplifying manufacturing while maintaining spectral characteristics
Solution Approach 2:
The patent creates a composite material system where the thermosetting plastic is combined with spectral modification compounds (dyes, photochromatic agents) at the molecular level. This homogeneous composite eliminates the need for separate functional layers and their associated manufacturing complexities
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
This method produces optical elements with optimal optical characteristics and reduced costs by avoiding deformation and laminate-related issues, while maintaining the impact resistance and optical quality of thermosetting materials.
Implementation Method 1
a first polyisocyanate or polyol-allyl-carbonate prepolymer and/or a first isocyanate or allyl-carbonate monomer including reactive functional groups capable of chemically reacting with the reactive functional groups of the self-supporting layer
Implementation Method 2
at least one chemical compound adapted to modify the spectral characteristics of transmitted light
Data Source
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AI summary
A method is described for manufacturing an optical element (13) made of thermosetting plastic material comprising the steps of: a) positioning in a mould a first self-supporting layer (6) made of partially cross-linked thermosetting plastic material including reactive functional groups; b) forming, on at least one surface of the self-supporting layer (6), a second layer (12) including: i) a polymerisable material in liquid phase including: prepolymers and/or monomers including reactive functional groups capable of chemically reacting with the reactive functional groups of the self-supporting layer made of partially cross-linked thermosetting plastic material, a reactive component including functional groups capable of chemically reacting with the reactive functional groups of the prepolymers and/or of the monomers and optionally with the reactive functional groups of the self-supporting layer (6) made of partially cross-linked thermosetting plastic material; ii) at least one element adapted to modify the spectral characteristics of the transmitted light; and c) cross-linking said first (6) and second (12) layers in the mould, so as to form a solid monolithic optical element (13) made of thermosetting plastic material comprising at least one functionalised layer (12) adapted to modify the spectral characteristics of the transmitted light. The optical element (13) thus obtained may have polarising properties, has optimal optical and mechanical characteristics and is capable at the same time of modifying the spectral characteristics of the transmitted light as desired.