Core/Cladding Filament for 3D Printed Optical Devices
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Solution Overview
Problem
Existing additive manufacturing technologies face challenges in producing microstructure components, particularly optical devices, with precise light guiding capabilities and complex geometries.
Innovation Solution
The development of a filament with a strand-like structure comprising elongated side-by-side core/cladding sections, where the inner core is optically transmissive and surrounded by a lower-index outer cladding, enabling continuous feeding into a 3D printing nozzle for the creation of optical devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional additive manufacturing feedstock is used, then manufacturing capability is maintained, but light guiding precision and optical performance deteriorate
Solution Approach 1:
The feedstock is segmented into distinct core and cladding regions within each filament strand. The core region contains optically transmissive material with higher refractive index, while the cladding region contains material with lower refractive index. This segmentation enables precise light guiding paths to be defined by the geometric structure of the filament itself, resolving the contradiction between manufacturing capability and light guiding precision.
Solution Approach 2:
The invention uses composite filament structures combining materials with different optical properties. The core material (e.g., photopolymerizable resin with higher refractive index) and cladding material (e.g., resin with lower refractive index or air) are复合ed in a single filament, enabling both structural integrity and precise optical performance to be achieved simultaneously during additive manufacturing.
2Adaptability or versatility
If complex geometries are produced, then design versatility is improved, but air gaps and optical defects increase
Solution Approach 1:
The filament structure provides different properties in different regions: the core region is optimized for light transmission and guiding, while the cladding region provides structural support and defines the light guiding boundaries. This local differentiation of material properties within the filament enables complex geometries to be manufactured with maintained optical performance, as each local region fulfills its specific function.
Solution Approach 2:
The cladding material acts as an intermediary between the core light-guiding material and the surrounding environment. It provides a controlled refractive index boundary that maintains optical performance even when the overall geometry becomes complex, preventing light leakage and maintaining guiding precision throughout the manufactured structure.
3Productivity
If continuous feeding is implemented, then manufacturing efficiency is improved, but filament structure control becomes more difficult
Solution Approach 1:
The core and cladding structures are pre-formed within the filament before the additive manufacturing process begins. This preliminary structuring of the feedstock eliminates the need for complex real-time control during manufacturing, as the optical pathways are already defined by the filament geometry. The continuous feeding system simply delivers pre-configured optical pathways, maintaining both efficiency and structural control.
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 solution allows for effective light guiding in optical devices, enabling the production of complex geometries such as optical tapers, faceplates, and bent fibers with improved optical performance and reduced air gaps.
Implementation Method 1
each having an optically transmissive inner core surrounded by a lower-index optically transmissive outer cladding for corresponding light guiding in the optical device
Data Source
AI summary
A filament for use as a feedstock in three-dimensional printing of an optical device has a strand-like structure for continuous feeding into a printing nozzle of a three-dimensional printer. The strand-like structure includes one or more of elongated side-by-side core/cladding sections each having an optically transmissive inner core surrounded by a lower-index optically transmissive outer cladding for corresponding light guiding in the optical device. In embodiments, the core may be a solid material or an air core, and in the case of solid material may include scintillation material or other enhancements. Other variations and specifics are disclosed.