Developing Device Individual Roller Correction for Image Quality
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Solution Overview
Problem
Existing image forming apparatuses face defects due to individual variations in developability among developing rollers, leading to inconsistent image quality and toner scattering, as current correction methods do not account for unique developability variations of each roller.
Innovation Solution
A developing device with a developability detector and a hardware processor that forms images using multiple developer bearing members, allowing for individual correction of developing conditions based on detected developability, ensuring optimized performance across all rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform correction is applied to all developing rollers, then the correction process is simple, but individual variations in developability cannot be addressed leading to image defects
Solution Approach 1:
The patent segments the correction process by individually identifying and correcting each developing roller based on its specific developability characteristics. The hardware processor controls the developing device to perform separate corrections for each roller rather than applying a uniform correction, thereby addressing individual variations while maintaining manageable complexity through systematic processing.
Solution Approach 2:
The patent implements local quality by applying different correction amounts to different developing rollers based on their individual developability. Each roller receives a customized correction tailored to its specific characteristics, ensuring that each component operates at optimal performance rather than applying a one-size-fits-all approach.
2Ease of operation
If developing bias is uniformly changed for all developing rollers, then the control is simple, but image quality varies such as graininess or periodic unevenness
Solution Approach 1:
The patent applies dynamics by making the developing bias adjustable and adaptable for each developing roller based on its individual developability. The hardware processor dynamically determines the appropriate bias for each roller rather than using a fixed uniform value, allowing the system to adapt to individual variations while maintaining operational simplicity through automated control.
3Ease of manufacture
If circumferential speed ratio of developing rollers is uniformly changed, then the adjustment process is simple, but toner scattering increases
Solution Approach 1:
The patent applies local quality by determining the appropriate circumferential speed ratio for each developing roller based on its individual developability characteristics. Each roller receives a customized speed ratio adjustment rather than a uniform change, preventing toner scattering by optimizing the speed for each specific roller while keeping the adjustment process manageable through systematic control.
4Manufacturing precision
If individual correction is performed for each developing roller, then image quality consistency is improved, but the correction process becomes more complex
Solution Approach 1:
The patent implements feedback by using the developability detection results to guide the correction process for each developing roller. The system detects the actual developability of each roller and uses this information to determine the appropriate correction amount, creating a closed-loop control system that achieves high precision while managing complexity through intelligent, data-driven decision-making.
Data Source
AI summary
A developing device includes a hardware processor that performs control not to cause an image to be formed on an image bearing member by a first developer bearing member and to cause a first image to be formed on the image beating member by a second developer bearing member, in which the hardware processor corrects developing conditions of the plural developer bearing members based on a developability detection result of the first image formed by the second developer bearing member.