Image Detecting Unit Correction via Conveying Speed Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image forming devices face productivity issues due to decreased conveying speed during density detection, leading to increased sheet waste and insufficient color reproducibility when using a line sensor and spectral colorimeter for image correction.
Innovation Solution
An image forming device with a controller that adjusts the conveying speed of transfer paper during image reading by a second image detecting unit, such as a spectral colorimeter, to correct the first image detecting unit, like a line sensor, based on shared image detection results, minimizing sheet waste and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the transfer paper conveying speed is decreased during density detection to improve detection accuracy, then measurement precision is improved, but productivity deteriorates
Solution Approach 1:
The conveying speed is dynamically adjusted based on the detection mode: decreased during spectral colorimeter correction to ensure accurate measurement, and increased during line sensor reading to maintain productivity. The system transitions between different speed states according to operational requirements.
2Speed
If the patch length is made longer to maintain constant integrated light amount at higher conveying speeds, then the line sensor can read at higher speed, but the number of charts required for correction increases and sheet waste increases
Solution Approach 1:
The spectral colorimeter acts as an intermediary for correction, using a standard patch length that works for both normal and high-speed operation. Its high-accuracy measurements enable the line sensor to operate at higher speeds without requiring longer patches, thus reducing sheet waste while maintaining productivity.
3Productivity
If the line sensor is used for high-speed reading to maintain productivity, then productivity is improved, but color reproducibility is insufficient
Solution Approach 1:
The spectral colorimeter periodically corrects the line sensor by comparing measurements of the same patch. This feedback mechanism compensates for the line sensor's insufficient color reproducibility, allowing it to operate at high speeds while maintaining accurate color measurement through continuous calibration.
Data Source
AI summary
An image forming device includes an image forming unit, a conveying unit, a first image detecting unit, a second image detecting unit, and a controller, wherein the controller includes a detecting unit correcting mode in which the first image detecting unit is corrected by using an image detection result by the second image detecting unit, and in the detecting unit correcting mode, a transfer paper conveying speed at the time of image reading by the second image detecting unit is changed to the transfer paper conveying speed different from a normal transfer paper conveying speed at the time of image formation and the first image detecting unit is corrected based on read results of the same image by the first and second image detecting units.