Image Forming Apparatus Page-by-Page Correction Control
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Solution Overview
Problem
Image forming apparatuses experience unstable image quality after restart, leading to variations in output on each sheet, which hinders the production of desired images corrected based on detection results from previous formations.
Innovation Solution
An image forming apparatus that independently acquires image correction information for each page and adjusts the image forming conditions using a control unit, determining whether the apparatus is in a quiescent state and measuring the quiescent period to correct image formation, with colorimetric sections for updating correction data based on image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If image correction is applied based on detection result from last image formation, then image quality should be improved, but large variation in image quality on every sheet after restart hinders effective correction
Solution Approach 1:
The system performs preliminary detection of the first sheet image after restart and calculates correction values before subsequent image formations. These correction values are stored and applied to the second and later sheets, ensuring that the variation in image quality across sheets is compensated in advance rather than reactively.
Solution Approach 2:
The system detects the actual image quality of the first sheet after restart, compares it with the target image quality, and generates feedback correction values. These correction values are then applied to adjust the image formation conditions for subsequent sheets, creating a closed-loop control system that eliminates image quality variation.
2Manufacturing precision
If correction value from first sheet detection is applied to second sheet, then image quality variation between first and second sheet is reduced, but variation between second and third sheet remains
Solution Approach 1:
The system performs preliminary detection of the first sheet image after restart and calculates correction values before subsequent image formations. These correction values are stored and applied to the second and later sheets, ensuring that the variation in image quality across sheets is compensated in advance rather than reactively.
Solution Approach 2:
The system dynamically adjusts the correction values based on the detected image quality of each sheet. Instead of applying a static correction, the system continuously updates correction values to match the actual image formation conditions, enabling adaptive compensation for variations across all sheets including the transition from second to third sheet.
Data Source
AI summary
An image forming apparatus including: an acquisition unit for independently acquiring image correction information on every page, the image correction information being independently preset for every page on which an image is to be formed; and a control unit for correcting an image forming condition for every page based on the image correction information acquired by the acquisition unit and controlling the image forming apparatus to form the image on a sheet based on the corrected image forming condition.