Compensation Image Toner Rate Control
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Solution Overview
Problem
Electrophotographic printing systems face issues with image burn-in artifacts and toner usage rate-related artifacts, leading to increased maintenance costs and downtime, particularly when printing sequences of similar pages or when toner usage rates are too high or too low.
Innovation Solution
The method involves analyzing the image data for a block of pages to determine the average toner usage rate and printing compensation images to adjust the toner usage within an acceptable range, which includes determining the number and toner distribution of compensation images to mitigate image burn-in artifacts and toner-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the toner take-out rate exceeds the system replenishment capability, then printing speed increases, but image nonuniformity artifacts occur
Solution Approach 1:
The system proactively monitors toner usage rates and predicts when the toner take-out rate will exceed replenishment capability. Compensation images are generated in advance and inserted into the print job before the artifact problem occurs, preventing image nonuniformity while maintaining high printing speed.
Solution Approach 2:
The system applies a counteracting measure by inserting compensation images with inverse toner distribution patterns before the harmful effect (image nonuniformity) can manifest. This preliminary anti-action neutralizes the potential artifact by pre-adjusting the toner usage rate to remain within acceptable ranges.
2Manufacturing precision
If the toner take-out rate is too low for an extended period, then image quality improves, but toner electric charge reaches elevated levels causing mottle and halftone disruption
Solution Approach 1:
The system continuously monitors the toner usage rate and provides feedback to the compensation image generation mechanism. When the toner take-out rate falls below acceptable thresholds, the system calculates and inserts compensation images with increased toner density to raise the average usage rate back into the acceptable range, preventing charge buildup artifacts.
Solution Approach 2:
The system dynamically adjusts the toner distribution parameters in compensation images based on the measured toner usage rate. By changing the toner density and pattern in compensation images, the system modulates the overall toner take-out rate to maintain it within the optimal range, avoiding both high and low usage rate artifacts.
3Productivity
If a sequence of similar pages is printed, then productivity increases, but image burn-in artifacts occur due to position-dependent performance changes
Solution Approach 1:
The system periodically inserts compensation images into sequences of similar pages at calculated intervals. These compensation images have inverted toner patterns that counteract the accumulating position-dependent performance drift in the photoreceptor and fuser, resetting the system state and preventing burn-in artifacts while maintaining batch printing efficiency.
Solution Approach 2:
The compensation images use inverted toner distribution patterns compared to the similar pages being printed. By printing images with opposite toner patterns, the system counteracts the position-dependent performance changes that cause burn-in, effectively neutralizing the artifact accumulation that occurs during batch printing of similar pages.
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 effectively reduces image burn-in artifacts and toner usage-related issues by ensuring the toner usage rate remains within acceptable limits, thereby improving image quality and reducing maintenance needs.
Implementation Method 1
an electrostatic latent image is formed on a photoreceptor by uniformly charging the photoreceptor and then discharging selected areas of the uniform charge to yield an electrostatic charge pattern
Implementation Method 2
charged toner particles are brought into the vicinity of the photoreceptor and are attracted to the latent image to develop the latent image into a toner image
Implementation Method 3
A suitable electric field is applied to transfer the toner particles of the toner image to the receiver to form the desired print image on the receiver
Data Source
AI summary
A method for reducing artifacts in an electrophotographic printing system includes receiving a print job including image data for a set of pages. The electrophotographic printing system is used to print a block of pages from the print job to provide corresponding printed pages. The image data for the block of pages is analyzed to determine an average toner usage rate. If the determined average toner usage rate for the block of pages falls outside an acceptable toner usage rate range, image data for a compensation image and a number of compensation images are determined such that the average toner usage rate will be brought back into the acceptable toner usage rate range.