Image Misalignment Correction Across Variable Color Print Modes
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Solution Overview
Problem
Existing image forming apparatuses face challenges in correcting color misalignment in images formed without using a particular reference color, leading to inaccuracies in image formation.
Innovation Solution
The apparatus includes a correction unit that sequentially executes a first and second correction process to correct misalignment in images developed on different groups of image bearers, using a detector to detect images on a transfer member and adjust for misalignment in both the main scanning and sub-scanning directions, even when the reference color is not used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color misalignment correction is performed based on a particular reference color, then misalignment correction accuracy is improved, but the apparatus cannot correct misalignment when the reference color is not used in the print mode
Solution Approach 1:
The image bearers are divided into multiple groups, with each group containing image bearers for different colors. The correction process is segmented into multiple correction processes, where each process corrects misalignment for a specific group of image bearers. This segmentation allows the system to perform correction without relying on a single reference color, thereby improving adaptability to different print modes while maintaining correction accuracy.
Solution Approach 2:
The correction unit is designed to perform multiple correction processes that can handle different print modes universally. By implementing a correction system that works with any group of image bearers as the basis for correction, the apparatus achieves multi-functionality, allowing it to correct misalignment whether or not a particular reference color is used in the print mode.
2Device complexity
If a single correction process is used for all image bearers, then the correction process is simple, but misalignment correction accuracy deteriorates when reference color images are not available
Solution Approach 1:
The correction process is divided into multiple segmented correction processes, each handling a specific group of image bearers. This segmentation increases correction accuracy by ensuring that correction can be performed even when certain reference colors are not used, while keeping each individual correction process relatively simple and manageable.
Solution Approach 2:
The system performs preliminary determination of which image bearers form a correction-capable group before executing the correction process. This preliminary action ensures that the correction process is launched only when appropriate image bearers are available, maintaining accuracy without requiring complex real-time adjustments during the correction execution.
3Reliability
If misalignment correction is performed for all image bearers simultaneously, then correction completeness is improved, but when reference color is not used, correction accuracy deteriorates
Solution Approach 1:
The correction process is segmented into multiple independent correction operations, each targeting a specific group of image bearers. This segmentation ensures that correction completeness is maintained across all image bearers while allowing each segment to operate with high accuracy based on its own group, even when reference colors are not universally available.
Solution Approach 2:
The correction system dynamically adapts to the available image bearers by determining which groups can form a correction basis in each print mode. This dynamic approach ensures that correction is performed on all necessary image bearers (completeness) while using the most appropriate reference group for each correction operation (accuracy).
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 ensures accurate image formation without relying on a reference color, effectively correcting color misalignment and maintaining image quality across various print modes.
Implementation Method 1
The plurality of optical writing devices irradiate the plurality of image bearers with a plurality of light beams to write a plurality of latent images on the plurality of image bearers
Data Source
AI summary
An image forming apparatus includes image bearers including a first image bearer and a second image bearer and circuitry that corrects misalignment of images developed on the image bearers, transferred to a transfer member, and detected by a detector. The circuitry sequentially executes a first correction process and a second correction process. The first correction process includes correcting misalignment in relation to images developed on the first image bearer based on images developed on a first group of image bearers of the image bearers. The first group of image bearers includes the first image bearer and the second image bearer. The second correction process includes correcting misalignment in relation to images developed on the second image bearer based on images developed on a second group of image bearers of the image bearers. The second group of image bearers excludes the first image bearer and includes the second image bearer.