Image Correction via Output Feedback Loop
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately correcting output images while minimizing toner consumption and productivity loss, particularly due to the delay in detecting and applying correction data from patch images formed in blank areas, which reduces the accuracy of subsequent image corrections.
Innovation Solution
An image forming apparatus that includes an image former, an output information detector, and a hardware processor to acquire correction amounts from subsequent images and apply them to earlier images, allowing for real-time correction based on detection results from earlier sheets, thereby reducing toner consumption and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If patch images are formed in blank areas to correct output images, then correction accuracy is improved, but toner consumption increases and productivity decreases
Solution Approach 1:
The patent uses the output image itself as a copy of the desired pattern for correction purposes, eliminating the need for separate patch images. The colorimetric section measures the actual output image, and the controller uses this measurement data to correct subsequent output images, thereby avoiding additional toner consumption and maintaining productivity while achieving accurate correction
2Measurement precision
If detection results are fed back after colorimetry is performed, then correction can be applied, but time delay reduces correction accuracy for subsequent images
Solution Approach 1:
The patent implements a feedback mechanism where the colorimetric section continuously measures output images and the controller applies correction data to subsequent images in real-time. The correction data from measuring one image is immediately used to correct the next image, minimizing time delay and maintaining high correction accuracy through continuous feedback loops
Data Source
AI summary
An image forming apparatus includes: an image former that forms an image, which is desired by a user and different from a predetermined pattern, on a sheet; an output information detector that detects output information on a first image formed on a first sheet by the image former; and a hardware processor that: acquires an correction amount of a third image, which is formed on a third sheet after the first sheet and a second sheet, according to a detection result of the first image by the output information detector and image information on a second image formed on the second sheet after the first sheet by the image former; and controls the image former so as to correct the third image based on the correction amount acquired by the hardware processor.