Laser Array Trigger Control for Scalable Powder Bed Fusion
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Solution Overview
Problem
Conventional powder bed fusion systems are limited in the power per unit area they can deliver while maintaining high part quality, and existing multi-laser systems face challenges in scalable control of a large number of independent lasers due to complexity and hardware limitations.
Innovation Solution
A scalable laser control system that uses a position sensor to detect the position of a laser array and generate a position signal, which is then used by a controller to trigger specific laser energy sources based on predefined trigger positions, allowing for synchronized control of a large number of independent lasers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional powder bed fusion systems use single or multiple lasers with traditional scanning methods, then the system can deliver laser energy to melt metal powder, but the power per unit area is limited and the control complexity increases with the number of lasers
Solution Approach 1:
The patent combines multiple independent laser sources into a unified laser array system that shares common control infrastructure. By merging the control of multiple lasers under a single synchronized framework using position sensors and trigger signals, the system achieves higher total power delivery while avoiding the exponential complexity that would result from controlling each laser independently.
Solution Approach 2:
The laser array system uses a universal control mechanism that can simultaneously address multiple laser sources with a single position signal. The controller is designed to universally manage any number of laser energy sources by comparing position signals against trigger positions and activating appropriate lasers, making the control system scalable without proportionally increasing complexity.
2Area of stationary object
If the spacing between final optical components is increased to cover larger build surfaces, then the build surface area increases, but the incident angle of the laser beam deviates from perpendicular
Solution Approach 1:
The patent divides the build surface into multiple zones, each served by a specific laser source in the array. By segmenting the coverage area and assigning dedicated lasers to specific regions, the system maintains perpendicular incident angles across the entire build surface even as the total area increases, since each laser operates within its own optimized angular range.
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 system enables efficient and high-resolution additive manufacturing by allowing for increased power delivery without increasing powder per unit area, while reducing complexity and hardware costs associated with controlling multiple lasers.
Implementation Method 1
a position sensor configured to detect a position of a laser array and generate a position signal
Implementation Method 2
one or multiple laser beams are scanned over a thin layer of metal powder... the laser beams are scanned along predefined trajectories such that solidified melt pool tracks create shapes
Implementation Method 3
the optics assembly movable relative to the build surface and configured to direct laser energy from the plurality of laser energy sources towards the build surface
Implementation Method 4
The first controller is configured to receive the position signal, compare the position signal to a list of laser trigger positions, and generate a trigger signal based on the comparison
Implementation Method 5
If the various laser parameters, such as laser power, laser spot size, and/or laser scanning speed are in a regime in which the delivered energy is sufficient to melt the particles of metal powder, one or more melt pools may be established on a build surface
Data Source
AI summary
Laser control systems and related methods for controlling arrays of lasers are disclosed. A laser control system may include a first controller configured to generate a trigger signal based on a position of a laser array, and a second controller configured to send a firing signal to one or more lasers of the laser array upon receiving the trigger signal. The one or more lasers may be selected based on a desired pattern of laser energy to be formed at a particular position of the laser array.