Duplex Image Registration Compensation via Toner Density Characterization
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Solution Overview
Problem
In high-speed duplex printing, maintaining precise registration of images on both sides of a printed sheet is challenging due to media distortion caused by fusing, leading to noticeable variations and poor print quality.
Innovation Solution
A method that compensates for media substrate distortions by processing image data based on toner density values and media characterization data, including media shrinkage data, to adjust image placement and fusion, using a printing system with a fuser and an image transfer point, and applying dynamic image distortion compensation algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed duplex printing is performed, then productivity is improved, but image registration precision deteriorates due to media distortion from fusing
Solution Approach 1:
The patent applies preliminary action by pre-characterizing media distortion at multiple toner density levels before printing, storing these characterization data in a database, and then using this pre-acquired data to compensate for distortion in real-time during high-speed duplex printing, enabling both high productivity and precise registration
2Manufacturing precision
If tight control of image magnification from Side 1 to Side 2 is maintained, then image registration precision is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by measuring actual media distortion during printing, comparing it with expected distortion, and using this feedback information to update and refine the media characterization database, thereby continuously improving registration precision without proportionally increasing device complexity
Solution Approach 2:
The patent applies parameter changes by utilizing multiple toner density values (low, medium, high) to characterize media distortion under different printing conditions, allowing the system to select appropriate compensation parameters based on the actual printing job requirements, thus achieving precise registration without excessive complexity
3Manufacturing precision
If media characterization data for multiple toner density values is collected, then manufacturing precision is improved, but loss of time increases during data collection
Solution Approach 1:
The patent resolves this contradiction by performing media characterization data collection as a preliminary action that can be done offline or during initial setup, storing the results in a database for rapid retrieval during actual printing operations, thus achieving high distortion compensation accuracy without significant time loss during production
Solution Approach 2:
The patent reduces time loss by implementing parameter changes - instead of collecting complete characterization data for all possible conditions, the system collects data for representative toner density levels (low, medium, high) and uses interpolation or selection algorithms to determine appropriate compensation for intermediate densities, thereby achieving sufficient accuracy with reduced data collection time
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 approach significantly reduces front-to-back image registration errors by up to an order of magnitude, ensuring high-quality duplex printing with minimal noticeable variations between sides.
Implementation Method 1
fusing the printed image on the media substrate
Implementation Method 2
media shrinkage data associated with the fusing of toner
Data Source
AI summary
This disclosure provides printing methods, systems and apparatus to compensate for distortions by fusing toner applied to a media substrate. According to one exemplary method, image data is processed according to media characterization data for a toner density value associated with the image. The processed image data compensates for media substrate distortions due to fusing of a printed image on the media substrate.