3D Article Printing Using Measured Surface Geometry
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Solution Overview
Problem
Existing methods for digital printing on three-dimensional articles suffer from deviations and insufficient print quality due to the use of predefined template images based on known master data, leading to distortions and inaccuracies, especially when printing complex surfaces.
Innovation Solution
A method utilizing three-dimensional imaging to measure the actual geometry of the article, generating partial print images for sub-areas, and combining them to create a precise print image without scaling, using a robot-guided measuring and printing system with a piezoelectric inkjet printhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a template print image based on known master data is used, then the printing process is simple and fast, but the print quality deteriorates due to deviations and distortions on complex three-dimensional surfaces
Solution Approach 1:
The patent applies preliminary action by performing three-dimensional measurement of the article surface before printing to obtain actual geometric data. This measurement step is executed in advance to capture the true contours and variations of the three-dimensional surface, which then serves as the basis for generating an accurate print image that adapts to the actual geometry rather than relying on predefined templates
Solution Approach 2:
The patent implements parameter changes by transitioning from using fixed template parameters based on master data to using dynamically measured geometric parameters from three-dimensional scanning. The print image parameters are adjusted according to the actual measured surface geometry, including variations in curvature, depth, and contour, thereby achieving precise printing on complex three-dimensional surfaces
2Adaptability or versatility
If scaling is applied to adapt the print image to actual dimensions, then the printing can accommodate size variations, but the print quality deteriorates due to accumulated deviations across the entire surface
Solution Approach 1:
The patent applies segmentation by dividing the three-dimensional surface into multiple sub-areas or zones for independent measurement and printing. Instead of applying a single scaled transformation to the entire surface, the method processes different regions separately based on their local geometric characteristics, thereby maintaining print accuracy across the whole surface while adapting to dimensional variations in each segment
Solution Approach 2:
The patent implements local quality by generating print images that are specifically adapted to the local geometric properties of each measured surface region. The printing parameters, including resolution, orientation, and scaling, are optimized for each local area based on its specific curvature, depth, and contour characteristics, rather than applying uniform scaling across the entire surface
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 precise and accurate printing on complex three-dimensional surfaces by detecting deeper contours and varying geometries, eliminating distortions and ensuring high-quality image reproduction.
Implementation Method 1
a piezoelectric inkjet printhead
Implementation Method 2
three-dimensional imaging methods can include, for example, laser triangulation, structured light projection, time-of-flight
Data Source
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AI summary
The invention relates to a method for printing on a three-dimensional article, comprising the steps of: measuring at least one region of the three-dimensional article, which region is to be printed on, by means of a three-dimensional imaging method, and providing measurement data with respect to the region to be printed on; producing a print image on the basis of the measurement data; and printing on the region to be printed on, by means of digital printing. The invention further relates to a device for printing on a three-dimensional article.