Recycled Light Beam Shaping for Higher-Throughput Additive Manufacturing
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Solution Overview
Problem
In laser-based additive manufacturing systems, a significant amount of light is wasted due to the rejection of unwanted light patterns, leading to reduced throughput and efficiency in material processing.
Innovation Solution
An optical system is developed to recycle and reuse the rejected light by employing a spatial polarization valve or light valve that rotates the polarization state of the light, allowing the unused energy to be redirected and combined with the original beam, thereby increasing the overall light intensity and maintaining high printing rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mask is applied to pattern the light in laser-based additive manufacturing systems, then the light can be split into negative and positive images for part building, but a significant amount of light is rejected and wasted leading to reduced throughput and efficiency
Solution Approach 1:
The patent recovers rejected light by redirecting it through the light valve a second time, converting previously rejected light into useful patterned light that can be reused for material processing, thereby reducing waste and improving throughput
Solution Approach 2:
The system maintains continuous useful action by recycling rejected light back through the optical system, ensuring that light energy is utilized productively rather than being discarded, thus sustaining high printing rates without compromising pattern quality
2Ease of operation
If rejected light is discarded to a beam dump, then the optical system can maintain simple operation, but energy is wasted and system efficiency decreases
Solution Approach 1:
A beam combiner acts as an intermediary optical element that redirects rejected light back into the optical path, merging it with the original beam without complicating the overall system operation, thus reducing energy waste while maintaining ease of operation
Solution Approach 2:
The light valve serves multiple functions: it patterns light in the forward direction and also processes recycled light in the return path, allowing the same component to handle both forward and backward light transmission, reducing the need for additional specialized components
3Productivity
If the light intensity is increased to improve material processing efficiency, then faster print rates are achieved, but system power requirements increase
Solution Approach 1:
By recovering and recycling rejected light, the system increases the effective light intensity available for material processing without requiring additional laser power, thus improving print rate while maintaining constant system power consumption
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 recycling of rejected light increases the intensity of the laser light directed to the build platform, enhancing material processing efficiency and reducing energy costs, allowing for faster print rates and improved material conversion rates without compromising system power.
Implementation Method 1
a spatial polarization valve or light valve that rotates the polarization state of the light
Implementation Method 2
allowing the unused energy to be redirected and combined with the original beam, thereby increasing the overall light intensity
Data Source
AI summary
A method and an apparatus pertaining to recycling and reuse of unwanted light in additive manufacturing can multiplex multiple beams of light including at least one or more beams of light from one or more light sources. The multiple beams of light may be reshaped and blended to provide a first beam of light. A spatial polarization pattern may be applied on the first beam of light to provide a second beam of light. Polarization states of the second beam of light may be split to reflect a third beam of light, which may be reshaped into a fourth beam of light. The fourth beam of light may be introduced as one of the multiple beams of light to result in a fifth beam of light.