Misregistration Correction Control for Image Forming Apparatus
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Solution Overview
Problem
Tandem-type electrophotographic image forming apparatuses face downtime due to misregistration issues caused by mechanical changes, particularly those affecting the intermediate transfer belt, which existing correction methods cannot effectively address.
Innovation Solution
An image forming apparatus with a control unit that executes three types of misregistration correction controls: estimation-based correction, latent image mark correction, and developer image correction, with the latter two offering higher precision and being triggered when cumulative correction errors exceed specific thresholds, allowing for selective use based on error levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If misregistration correction is executed periodically during continuous printing, then image quality is maintained, but user downtime increases
Solution Approach 1:
The system performs preliminary misregistration correction using the electrostatic latent image method before printing operations begin or between print jobs. By executing correction in advance using the photosensitive member and latent image detection, the system prepares corrected registration parameters without interrupting subsequent printing workflows, thus maintaining image quality while minimizing user downtime.
2Manufacturing precision
If high precision correction methods are used continuously, then misregistration accuracy improves, but system complexity and processing time increase
Solution Approach 1:
The correction system is segmented into two distinct methods: a high-precision electrostatic latent image correction method and a simpler estimation-based correction method. The control unit segments the correction tasks by selecting which method to apply based on measured misregistration amounts and predetermined thresholds. This segmentation allows the system to use complex high-precision correction only when necessary, while relying on simpler methods for routine corrections, thereby reducing overall system complexity and processing time.
Solution Approach 2:
The system applies partial correction action by using the high-precision electrostatic latent image method only when misregistration exceeds predetermined thresholds, rather than continuously applying the most precise method. For minor misregistrations within acceptable ranges, the system uses simpler estimation-based correction or no correction at all. This partial application of high-precision correction reduces processing overhead while maintaining adequate image quality for most printing conditions.
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 reduces downtime by selectively employing higher precision correction methods when necessary, ensuring high-quality image formation while minimizing apparatus downtime.
Implementation Method 1
a configuration that corrects misregistration by detecting an electrostatic latent image for correction formed on a photosensitive member
Data Source
AI summary
An image forming apparatus includes: an image forming unit configured to form developer images of a plurality of colors on an image carrier; and a control unit configured to execute a first correction control and a second correction control that has a higher correction precision than the first correction control in order to correct misregistration between the developer images formed by the image forming unit. The control unit is further configured to execute the second correction control when a cumulative correction error, which is a cumulative value of correction error occurring when performing misregistration correction using the first correction control, exceeds a first threshold.