Dual-Side Media Registration via Fiducial Imaging
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Solution Overview
Problem
Printing systems face challenges in maintaining accurate registration of patterns on both sides of print media due to ink absorption causing media expansion, which affects alignment and print quality, especially under varying environmental conditions like temperature and humidity.
Innovation Solution
An image registration system using cameras to capture images of fiducials and patterns on both sides of the media, processing these images to determine relative locations and adjust print head positions for precise registration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ink is applied to the print media by the printheads, then the print media absorbs the ink and expands, but this expansion causes misalignment of the print media relative to the media transport
Solution Approach 1:
The patent employs a feedback mechanism where sensors detect the actual position of the print media after ink application and expansion, and this information is fed back to the control system to adjust subsequent printing operations. This closed-loop control compensates for the expansion-induced misalignment, maintaining both print quality and alignment accuracy.
Solution Approach 2:
The system dynamically adjusts printing parameters such as ink quantity, printhead position, and media transport speed based on detected expansion characteristics. By changing these parameters in response to media expansion, the system maintains proper registration between printed patterns despite the physical changes in media dimensions.
2Manufacturing precision
If the print media absorbs ink and stretches during printing, then print quality is affected, but continuous monitoring and adjusting are needed to maintain registration
Solution Approach 1:
The patent introduces intermediary elements such as registration marks, sensors, and control algorithms that mediate between the ink absorption process and the final registration outcome. These intermediaries enable indirect measurement and control of registration accuracy without requiring direct intervention in the ink absorption process itself, thereby managing system complexity while maintaining precision.
Solution Approach 2:
The system replaces purely mechanical alignment methods with a combination of optical sensing, digital image processing, and computational correction. Instead of relying solely on mechanical precision of the media transport system, the patent uses vision systems and software algorithms to detect and correct registration errors, reducing the burden on mechanical components.
3Manufacturing precision
If environmental conditions like temperature or humidity vary, then the print media expansion varies, but this leads to reduction in print quality
Solution Approach 1:
The system incorporates environmental sensors that continuously monitor temperature and humidity conditions, and this environmental data is fed back to the control system. The controller adjusts printing parameters based on the detected environmental conditions and their predicted effect on media expansion, enabling the system to adapt to varying environments while maintaining consistent print quality.
Solution Approach 2:
The patent implements preliminary characterization of the print media's expansion behavior under different environmental conditions. Before actual printing, the system performs test prints or uses pre-stored expansion data to predict how the media will behave under current environmental conditions, and pre-adjusts printing parameters accordingly to compensate for anticipated expansion variations.
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 solution ensures accurate alignment and improved print quality by continuously monitoring and adjusting for media expansion and environmental changes, maintaining precise registration of patterns on both sides of the print media.
Implementation Method 1
A first camera captures a first fiducial image of the first side of the fiducial and the fiducial origin and a first pattern image of the first pattern printed on the first side of the print media
Implementation Method 2
As ink is applied to the print media by the printheads of the printing system, it is absorbed by the print media, causing the print media to expand
Implementation Method 3
An image registration controller processes the first fiducial image, the first pattern image, the second pattern image, and the second fiducial image to determine the relative location of the first pattern and the second pattern
Data Source
AI summary
An image registration system for determining a relative location of a first pattern and a second pattern includes a fiducial having a fiducial origin, a first side, and a second side. A first camera captures a first fiducial image of the first side of the fiducial and the fiducial origin and a first pattern image of the first printed pattern. A second camera captures a second fiducial image of the second side of the fiducial and a second pattern image of the second printed pattern. An image registration controller processes the first fiducial image, the first pattern image, the second pattern image, and the second fiducial image to determine the relative location of the first pattern and the second pattern.