Color Misregistration Correction in Image Forming Apparatus
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Solution Overview
Problem
Color misregistration in image forming apparatuses occurs due to varying image forming speeds, leading to degraded image quality as correction amounts calculated at one speed do not accurately correct misregistration at other speeds, especially at lower or higher speeds.
Innovation Solution
The image forming apparatus detects color misregistration amounts at multiple speeds and adjusts write start timings for toner images of different colors based on these measurements, using correlation data to correct misregistration accurately across various speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If color misregistration correction is performed using a correction amount calculated at one image forming speed, then the correction is simple and quick, but the color misregistration accuracy deteriorates at other image forming speeds
Solution Approach 1:
The patent applies dynamics by making the correction amount variable according to image forming speed. Instead of using a fixed correction amount, the system dynamically adjusts the correction amount based on the detected misregistration at the current speed, allowing accurate correction across multiple speeds without sacrificing productivity
Solution Approach 2:
The patent changes the parameter of correction amount based on image forming speed. By detecting color misregistration at different speeds and storing multiple correction amounts, the system selects the appropriate correction amount for the current speed, resolving the contradiction between simple correction and accuracy across varying speeds
2Adaptability or versatility
If the range of image forming speeds is widened to accommodate diverse paper types, then the adaptability increases, but color misregistration due to component deterioration becomes more evident
Solution Approach 1:
The system dynamically adapts to different image forming speeds by detecting and correcting speed-specific misregistration. This allows the apparatus to maintain high color accuracy across a wide range of speeds and paper types without being constrained by component deterioration at extreme speeds
Solution Approach 2:
The patent implements feedback by detecting color misregistration at each image forming speed and using this information to determine appropriate correction amounts. This feedback mechanism enables the system to compensate for speed-dependent misregistration caused by component deterioration, maintaining accuracy across diverse operating conditions
3Speed
If color misregistration correction is optimized for the highest image forming speed, then the correction works well at high speeds, but the color misregistration amount becomes large at the lowest image forming speed
Solution Approach 1:
The patent segments the correction approach by speed, storing multiple correction amounts corresponding to different image forming speeds. This segmentation allows the system to apply the most appropriate correction for each speed, avoiding the trade-off between high-speed and low-speed accuracy that would result from using a single optimization point
Data Source
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AI summary
In an image forming apparatus (100) an image forming unit forms a first image of a first color and a second image of a second color. An obtaining unit obtains information related to relative positions of a first measurement image, which formed on an image carrier, of the first color and a second measurement image, which formed on an image carrier, of the second color. A generation unit generates correlation data based on first information corresponding to a first image forming speed and second information corresponding to second information. A controller, in a case where the image forming unit forms an image at the second image forming speed, corrects relative positions of the first image and the second image based on the first information in advance and the correlation data.