Micro Injection-Molded Light Guides With Pixelated Mold Temperature Control
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Solution Overview
Problem
Conventional injection molding techniques struggle to control material viscosity and replicate surface geometry for micro light guides, leading to the need for additional machining and internal material stresses, especially when manufacturing micro structures with features thinner than 100 micrometers.
Innovation Solution
The use of a pixelated mold manifold that allows for selective temperature adjustment of discrete regions within the mold, enabling the injection material to fully propagate to micro features at lower pressures and flow rates, reducing internal stresses and the need for subsequent machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional injection molding techniques are used, then production can proceed with standard equipment, but manufacturing precision deteriorates for micro structures thinner than 100 micrometers
Solution Approach 1:
The mold manifold is segmented into multiple independently controlled regions, each capable of receiving different temperatures. This segmentation allows precise thermal management for different sections of the mold cavity, enabling accurate replication of micro features while maintaining overall process control.
Solution Approach 2:
Different regions of the mold manifold are provided with different temperatures according to local requirements. This local quality approach ensures that each region of the mold cavity receives optimal temperature for material propagation, achieving high fidelity replication of micro structures without requiring uniform complex control across the entire mold.
2Manufacturing precision
If higher injection pressure is used to fill micro features, then material propagation improves, but internal material stresses increase
Solution Approach 1:
The patent changes the temperature parameter of the mold manifold regions to optimize material propagation. By controlling temperature, the viscosity and flow characteristics of the injection material are modified, allowing complete filling of micro features at lower injection pressures, thereby reducing internal stresses while maintaining feature replication accuracy.
3Manufacturing precision
If additional machining is performed after injection molding, then manufacturing precision improves, but productivity decreases
Solution Approach 1:
The pixelated mold manifold with selective temperature control performs preliminary action by ensuring complete and accurate material propagation to all micro features during the injection molding process itself. This preliminary precision eliminates the need for subsequent machining operations, maintaining both high dimensional accuracy and production efficiency.
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 approach results in high-fidelity micro injection-molded articles with uniform material properties, increased flatness, and reduced internal stresses, eliminating the need for additional machining and achieving precise fidelity to the mold cavity dimensions.
Implementation Method 1
a pixelated mold manifold that allows for selective temperature adjustment of discrete regions within the mold
Implementation Method 2
controlling material viscosity becomes increasingly difficult at smaller portions of a mold cavity
Implementation Method 3
enabling the injection material to fully propagate to micro features at lower pressures and flow rates
Implementation Method 4
When injection molding micro articles, which refer to structures having walls or features with a thickness of less than 100 micrometers, control becomes progressively more difficult as an injected material approaches thinner portions of the micro structure
Data Source
AI summary
In one or more embodiments, micro light guides are constructed that include a wall and one or more features extending from or protruding into one or more surfaces of the wall. The microstructure light guide is defined by a mold and formed as a single article with uniform internal stresses. In at least some embodiments, the mold that defines the microstructure light guide employs pixelated mold portions that enable selective temperature adjustment of discrete regions of the mold portions to form the microstructure light guide.