3D Printer Optical Sensor Layer Correction
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Solution Overview
Problem
Three-dimensional printing faces challenges with dimensional accuracy due to inconsistencies in ink material flow, thermal expansion, mechanical issues, and other errors that are not detected by monitoring the support platform or printhead movement, leading to costly and time-consuming scrapping of printed objects.
Innovation Solution
An apparatus with an optical sensor and controller that detects errors in material ejection and adjusts raster image data in real-time to compensate for positional inaccuracies during the printing process, ensuring accurate layer formation and maintaining object dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If monitoring of support platform or printhead movement is used to control dimensional accuracy, then mechanical positioning accuracy is improved, but detection of actual material ejection errors is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where an optical sensor continuously monitors the actual position and dimensions of printed layers, and the controller adjusts subsequent layer deposition parameters based on detected deviations. This closed-loop feedback system enables real-time correction of dimensional errors that arise from material flow inconsistencies, thermal expansion, and other printing process variations.
Solution Approach 2:
The patent replaces reliance on mechanical positioning monitoring alone with an optical measurement system. The optical sensor detects actual layer dimensions and material placement accuracy, providing a non-contact method to measure dimensional accuracy that is independent of mechanical system performance and can detect errors in material ejection that mechanical monitoring cannot identify.
2Manufacturing precision
If real-time error detection and correction is implemented, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces an optical sensor as an intermediary component that bridges the gap between the printing process and the control system. This intermediary enables indirect measurement of dimensional accuracy by detecting light reflections or transmissions from the printed layers, providing error information without requiring direct physical contact or complex embedded sensors within the printing mechanism itself.
3Manufacturing precision
If continuous monitoring and correction during printing is performed, then object quality is improved, but printing time increases
Solution Approach 1:
The patent maintains continuous printing operation while simultaneously performing optical detection and correction. The optical sensor operates concurrently with the printing process, detecting layer dimensions without interrupting material deposition. The controller processes detection data and adjusts subsequent layers in real-time, ensuring that the useful action of printing continues uninterrupted while quality control is maintained.
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 effectively detects and corrects errors during printing, enhancing the dimensional accuracy of three-dimensional objects and reducing the need for scrapping, thereby saving time and resources.
Implementation Method 1
an optical sensor configured to generate data corresponding to edges of a top layer of material ejected onto a platen
Data Source
AI summary
A printer compensates for printing errors occurring during production of the layers for the formation of an object in a three-dimensional printer. The printer includes an optical sensor that generates data corresponding to edges of each layer of the object after each layer is printed. Differences between the raster data used to eject the material to form a layer and the data received from the optical sensor are used to modify the raster data that operates a printhead to form a next layer in the object.