Volumetric 3D Printing via Multi-Angle Light Field Projection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current additive manufacturing techniques face limitations in producing complex geometries due to serial layer-by-layer processing, which restricts surface finish and dimensional capabilities, and are often limited to periodic structures with one dimension smaller than the others.
Innovation Solution
The system employs computed tomography techniques to perform volumetric fabrication by exposing a photopolymer resin with 3D light fields from multiple angles, using spatial and temporal multiplexing of optical projections to create a 3D radiation dose distribution, allowing for arbitrary structures to be formed in a single step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If layer-by-layer serial processing is used, then process flexibility is improved, but surface finish and fabrication speed deteriorate
Solution Approach 1:
The patent transitions from 2D layer-by-layer processing to 3D volumetric processing by using three orthogonal DLP projectors to simultaneously cure entire volumes of photopolymer resin. This dimensional change eliminates stair-step artifacts and improves surface finish while maintaining geometric flexibility through programmable light field control.
Solution Approach 2:
The patent merges three separate DLP projection systems oriented along orthogonal axes (x, y, z directions) to simultaneously illuminate and cure the entire build volume. This combination enables parallel processing of all layers, dramatically increasing fabrication speed while the coordinated control maintains process flexibility for complex geometries.
2Adaptability or versatility
If layer-by-layer serial processing is used, then process flexibility is improved, but fabrication speed deteriorates
Solution Approach 1:
The patent transitions from sequential 2D layer processing to simultaneous 3D volumetric processing using three orthogonal projectors that illuminate the entire build volume at once. This eliminates the serial nature of traditional SLA, enabling parallel curing of all layers and achieving fabrication speedups of 10-100x while maintaining geometric flexibility.
Solution Approach 2:
The patent achieves continuous volumetric curing by coordinating three DLP projectors to simultaneously expose the entire photopolymer volume without sequential layer transitions. The synchronized projection and curing process eliminates idle time between layers, maintaining continuous productive action throughout the build volume.
3Productivity
If volumetric fabrication with constant cross-section is used, then fabrication speed is improved, but geometric complexity deteriorates
Solution Approach 1:
The patent creates a universal volumetric fabrication system where three orthogonal DLP projectors can simultaneously generate arbitrary 3D intensity distributions. This multi-functional approach enables the same hardware to produce any geometry (periodic or aperiodic, simple or complex) by programming the light field patterns, eliminating the constant cross-section limitation while maintaining fast parallel processing.
Solution Approach 2:
The patent introduces dynamic control of the light field intensity distribution through programmable DLP projectors. The system can adaptively adjust the 3D illumination pattern for each material layer, enabling arbitrary geometries to be formed by dynamically modulating which regions receive curing light, thus overcoming the static constant cross-section constraint.
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 enables the creation of complex geometries with improved surface quality and reduced dimensional constraints, overcoming the limitations of traditional layer-by-layer processing and achieving faster fabrication speeds while eliminating stair-step artifacts.
Implementation Method 1
The plurality of optical subsystems are further controlled by the controller to provide each of the optical projections with a calculated three-dimensional intensity distribution acting over a fixed temporal exposure period, which is sufficient to cure at least selected portions of the volume of photo-responsive material
Data Source
AI summary
In one aspect the present disclosure relates to a system for forming a three dimensional (3D) object from a volume of photo-responsive material contained within a material container. A plurality of optical projection subsystems are adapted to be arranged at least partially circumferentially around a material container containing the volume of photo-responsive material, and are controlled by a controller. The optical projection subsystems direct optical projections at a plurality of angles θ through the volume of photo-responsive material. The optical projections are further directed about a z axis extending through the volume of photo-responsive material. The plurality of optical subsystems are further controlled by the controller to provide each of the optical projections with a calculated three-dimensional intensity distribution acting over a fixed temporal exposure period, which is sufficient to at least one of cure or remove selected portions of the volume of photo-responsive material, and leave other portions unmodified, to form a desired 3D part.