Image Forming Apparatus Deviation Correction for Pattern Detection
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in accurately detecting pattern images due to misalignment caused by deviation correction, which affects the stability and uniformity of image quality, especially in electrophotographic processes.
Innovation Solution
The apparatus includes an image forming section, a conveyance position detecting section, and an image detecting section, where the image control section performs deviation correction for input images but not for pattern images, ensuring the pattern image is formed at a predetermined position corresponding to the image detecting section, allowing for accurate detection and minimizing misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If deviation correction is performed to minimize image misalignment, then image forming position stability is improved, but pattern image detection accuracy deteriorates due to position displacement
Solution Approach 1:
The patent segments the image forming process into two distinct modes: pattern image forming mode and normal input image forming mode. In pattern image forming mode, deviation correction is suspended to ensure detection accuracy, while in normal mode, deviation correction is applied to ensure position stability. This segmentation allows each mode to optimize for its specific requirement without compromising the other.
Solution Approach 2:
The patent dynamically adjusts the deviation correction function based on the current operation mode. The image forming control section is configured to suspend deviation correction specifically when forming pattern images, while maintaining it during normal input image formation. This dynamic control enables the system to adapt its correction behavior to the immediate operational context, resolving the contradiction between stability and detection accuracy.
2Manufacturing precision
If deviation correction is applied to correct sheet displacement, then image alignment across sheets is improved, but the position correspondence between pattern image and detection sensor is lost
Solution Approach 1:
The patent divides the image forming operation into distinct functional segments: pattern image formation for detection purposes and normal input image formation for production. During pattern image formation, deviation correction is suspended to maintain position correspondence with the detection sensor. During normal operation, deviation correction is applied to ensure proper alignment across sheets. This segmentation allows the system to prioritize detection reliability when needed and alignment precision during production.
Solution Approach 2:
The patent applies different quality requirements to different parts of the operation cycle. For pattern image formation, the local quality requirement is position correspondence with the detection sensor, so deviation correction is suspended. For normal input image formation, the local quality requirement is alignment across sheets, so deviation correction is applied. This local differentiation of quality requirements resolves the contradiction by allowing each operation to optimize for its specific goal.
Data Source
AI summary
When an input image is to be formed on a sheet conveyed to a transfer roller, the exposure section is controlled and deviation correction is performed to offset the image forming position across the width of the sheet in response to the result of detection by a deviation sensor. By contrast, when pattern images are to be formed on a sheet in response to the instruction of the main control section, the image forming control section does not perform deviation correction in the process of forming a pattern image.