Image Density Detection via Separate Position Mark
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Solution Overview
Problem
Conventional image information detecting devices face issues with false detection of image density due to positional deviations of the density detection image with respect to the image bearer, leading to inaccurate detection and calibration.
Innovation Solution
The implementation of a system that includes a position detection sensor and a density detection sensor, where the position detection mark and density detection mark are formed and detected separately, allowing for precise correction of image forming conditions to prevent false density detection and ensure accurate image density calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single density detection image is used, then the device complexity is reduced, but the measurement precision deteriorates due to false detection from positional deviations
Solution Approach 1:
The patent divides the detection function into two separate detection images: a position detection image for detecting the position of the position detection mark, and a density detection image for detecting the density of the density detection mark. This segmentation allows each detection image to be optimized for its specific purpose, preventing false detection while maintaining manageable system complexity
Solution Approach 2:
The patent introduces a position detection mark as an intermediary element that enables accurate positioning of the density detection image. By first detecting the position of the position detection mark and using it to correct the position of the density detection image, the system ensures accurate density measurement without requiring direct complex positioning mechanisms
2Ease of manufacture
If the position detection mark and density detection mark are formed together, then the manufacturing process is simplified, but the reliability deteriorates due to potential positional deviations affecting density detection
Solution Approach 1:
The patent separates the position detection function and density detection function into distinct marks (position detection mark and density detection mark) with different patterns and purposes. This segmentation ensures that even if they are formed in the same process, their functions remain independent, allowing accurate position correction without compromising density detection reliability
Solution Approach 2:
The patent performs position detection first, using the detected position of the position detection mark to correct the position of the density detection image before density measurement. This preliminary position correction action ensures that subsequent density detection is performed at the correct location, preventing false detection while maintaining manufacturing simplicity
Data Source
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AI summary
An image forming apparatus (500) includes an image forming device (7), an image position detector (30), and an image density detector (31). The image forming device (7) forms an image on a surface of a recording medium. The image position detector (30) detects a position of the image. The image density detector (31) detects a density of the image. The image forming device (7) forms a position detection image (T) on a surface of a first recording medium (P). The image position detector (30) detects a position of the position detection image (T) on the surface of the first recording medium (P). The image forming device (7) forms a density detection image (U) on a second recording medium (P). The image density detector (31) detects a density of the density detection image (U) on the surface of the second recording medium (P).