Stereolithography Apparatus Optical Adjustment Detection Unit
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Solution Overview
Problem
Stereolithography apparatuses face challenges in maintaining stable optical unit properties over time, leading to errors in 3D object size due to changes in magnification scale, which requires manual calibration using external objects and is complex and time-consuming.
Innovation Solution
A stereolithography apparatus with a detection unit and control system that allows for selective optical adjustments and image modifications during the generation process, using sensors and driving mechanisms to detect and correct issues such as focus layer position, image sharpness, and magnification scale, eliminating the need for external calibration objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual calibration using external calibration objects is performed, then optical unit properties can be controlled, but the process becomes complex and time-consuming
Solution Approach 1:
The stereolithography apparatus performs self-calibration by automatically detecting its own optical unit properties (magnification scale, focus layer position) using integrated detection means and adjusting them without requiring external calibration objects or user intervention. The system uses its own projection means and detection means to measure and correct optical deviations.
Solution Approach 2:
The system implements feedback control by continuously monitoring optical unit properties through detection means, comparing detected values against target values, and automatically adjusting the optical unit (via driving means) or modifying projection images to correct deviations. This closed-loop feedback eliminates manual calibration steps.
2Manufacturing precision
If calibration is performed manually by user, then optical accuracy can be maintained, but calibration time increases
Solution Approach 1:
The calibration process is integrated into the normal operation flow, allowing continuous monitoring and adjustment during or between printing steps. The detection means can operate during generation pauses without stopping production, and adjustments are made automatically without requiring dedicated calibration time slots.
Solution Approach 2:
The system automatically performs calibration without requiring user time investment. The integrated detection means continuously monitors optical properties and the control unit automatically executes corrections, eliminating the need for manual calibration operations that would consume user time.
3Productivity
If optical unit properties are not continuously monitored, then device complexity remains low, but errors in 3D object dimensions occur over time
Solution Approach 1:
The system continuously monitors optical unit properties (magnification scale, focus layer position) during operation using detection means, and the control unit automatically adjusts the optical unit or modifies projection images based on detected deviations, maintaining precision throughout continuous printing without interruption.
Solution Approach 2:
The system performs preliminary detection and adjustment of optical properties before they cause significant errors in 3D object dimensions. By continuously monitoring and making small corrective adjustments, the system prevents cumulative errors from developing during continuous printing operations.
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
Enables continuous monitoring and automatic correction of optical unit properties, simplifying the calibration process and maintaining accurate 3D object dimensions without the need for user-measured calibration objects, ensuring stable and precise 3D printing.
Implementation Method 1
a detection means (8) that is movably arranged in a detection region (9) for detecting during the generation process or in a generation-pause at least part of the image projected by the optical unit (4)
Data Source
AI summary
The present invention relates to a stereolithography apparatus for generating a three-dimensional object, comprising: an optical unit for projecting an image towards the photocurable substance for hardening the photocurable substance deposited in the focus layer; a control unit, characterized by further comprising: a detection unit which comprises: a detection means movably arranged in a detection region for detecting during the generation process or in a generation-pause the image projected by the optical unit and for outputting a detection signal; and a first driving means for moving the detection means into or out of the detection region, wherein the optical unit comprises: a second driving means linked to the optical unit for moving the focus layer into or out of the detection region, wherein the control unit adjusts the optical unit and/or modifies the image to be projected based on the signal indicative of the detected image.