Image Forming System for Transport-Aware Gradation Correction
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Solution Overview
Problem
Existing image forming systems face challenges in accurately performing gradation correction due to fluctuations in the transport speed of recording media, which can affect the scanning of gradation patterns by scanning devices, leading to inaccuracies in density and alignment.
Innovation Solution
The system adjusts the position and characteristics of gradation patterns on the recording medium based on the type and transport orientation of the medium, using a printing control program to compensate for speed fluctuations and ensure accurate gradation correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the gradation pattern is scanned by the scanning device during recording, then gradation correction can be performed, but the scanning accuracy is deteriorated due to fluctuation in transport speed of the recording medium
Solution Approach 1:
The system performs preliminary actions by printing the gradation pattern at a predetermined position on the recording medium before the actual scanning occurs. This predetermined positioning is calculated in advance based on the relationship between the printing device and scanning device, ensuring that when scanning happens during recording, the gradation pattern is already in the optimal position for accurate scanning, thereby resolving the contradiction between performing gradation correction and maintaining scanning accuracy under transport speed fluctuations.
2Manufacturing precision
If the gradation pattern is printed on the recording medium, then gradation correction can be performed by scanning, but the position of the gradation pattern is influenced by fluctuation in transport speed
Solution Approach 1:
The system establishes a feedback mechanism where the printing device transmits information about its own position and the position of the gradation pattern to the scanning device. This feedback loop allows the scanning device to compensate for transport speed fluctuations by adjusting its scanning parameters based on the actual position data received from the printing device, thereby maintaining both manufacturing precision of gradation correction and measurement precision of position accuracy despite transport variations.
3Productivity
If the scanning device scans the gradation pattern during recording, then real-time gradation correction is possible, but moiré patterns are generated due to transport speed fluctuation
Solution Approach 1:
The system performs preliminary positioning of the gradation pattern at a predetermined location that is calculated to be optimal for scanning. By pre-determining this position based on the relationship between printing and scanning devices, the system ensures that when scanning occurs during recording, the gradation pattern is already positioned to avoid moiré pattern generation, thus maintaining high productivity while eliminating the harmful moiré effect caused by transport speed fluctuations.
Data Source
AI summary
An image forming system includes a processor configured to control a printing device such that a position of a gradation pattern scanned by a scanning device is changed and printed on a recording medium on which the gradation pattern is printed in accordance with at least one of a type of the recording medium or a transport orientation which is an orientation in which the recording medium is transported in the scanning device.