Pixel Shifting in Additive Manufacturing for Resolution
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Solution Overview
Problem
Additive manufacturing processes face challenges in efficiently printing large components and components with fidelity-critical features, such as achieving precise shapes and minimizing pixelization, while maintaining resolution and reducing apparatus complexity.
Innovation Solution
An additive manufacturing apparatus that intelligently shifts and flashes a grid of pixels to align with the features of the component being printed, allowing for the creation of diverse parts with improved edge sharpness and roundness, and enabling the production of larger components without loss of resolution by optimizing the layer build plan based on geometry and optimization rules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed grid of pixels is used for printing, then the apparatus structure is simple, but the printing efficiency and accuracy for complex shapes deteriorate due to pixelization and inability to align with features
Solution Approach 1:
The patent implements dynamic shifting of the pixel grid relative to the component geometry. The grid is no longer fixed but can be shifted in discrete increments to align with critical features of the component being printed. This dynamic adjustment allows the same apparatus to adapt to different component geometries, improving edge sharpness and feature fidelity without requiring complex custom apparatus for each part type.
Solution Approach 2:
The patent changes the positional parameters of the pixel grid dynamically. By shifting the grid position in controlled increments, the system optimizes alignment between the pixel array and the component features. This parameter change approach enables improved manufacturing precision for complex shapes while maintaining the same physical apparatus, avoiding the need for complex reconfigurable hardware.
2Manufacturing precision
If the apparatus is designed for high resolution printing, then printing accuracy is improved, but the size of components that can be printed is limited
Solution Approach 1:
The patent segments the printing process into multiple passes with discrete grid shifts. Instead of attempting to print the entire large component in a single high-resolution pass, the system divides the build area into multiple zones by shifting the pixel grid incrementally. This allows high resolution to be maintained in each local zone while the overall printable area is extended across multiple segments, effectively printing larger components without loss of resolution.
Solution Approach 2:
The patent adds the dimension of time and sequential processing to resolve the contradiction. By implementing multi-pass printing with grid shifts between passes, the system effectively transforms a two-dimensional resolution limitation into a three-dimensional solution space. The same high-resolution pixel array can address different spatial regions at different times, enabling large component printing while maintaining resolution through temporal sequencing.
3Area of stationary object
If multiple grid positions are used to print large components, then the printable area is increased, but the printing time increases due to multiple shifts and flashes
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-planning the optimal sequence of grid shifts and pixel flashing operations. The layer build plan is generated in advance, determining the most efficient path through multiple grid positions. This preliminary planning minimizes unnecessary shifts and optimizes the flashing sequence, reducing the total printing time required to cover large areas while maintaining high resolution.
Solution Approach 2:
The patent maintains continuity of useful action by optimizing the grid shift sequence to minimize idle time between operations. The system continuously progresses through the build area with each grid shift and flash operation contributing to the final component. By eliminating unnecessary intermediate positions and optimizing the path through the build volume, the system maintains productive action throughout the extended printing process, reducing overall time loss despite printing larger areas.
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 solution enhances printing efficiency and accuracy, allowing for the creation of complex shapes with improved resolution at edges and surfaces, and reduces the overall complexity of the manufacturing apparatus, enabling the production of larger components with precise features.
Implementation Method 1
a tank of radiant-energy curable photopolymer 'resin' and a curing energy source such as a laser. Similarly, Digital Light Processing (DLP) three-dimensional (3D) printing employs a two-dimensional image projector to build components one layer at a time. For each layer, the energy source draws or flashes a radiation image of the cross section of the component onto the surface of the resin. Exposure to the radiation cures and solidifies the pattern in the resin
Data Source
AI summary
An additive manufacturing apparatus includes a support plate defining a window and a resin support configured to support an uncured layer of resin. A stage is configured to hold one or more cured layers of the resin to form a component positioned opposite a support plate. A radiant energy device is positioned on an opposite side of the resin support from the stage and is operable to project radiant energy in a grid through the window. The grid and/or pixels thereof are intelligently shifted to efficiently print one or more layers of a component.