Image Reading Device Skewed Media Detection
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Solution Overview
Problem
Conventional image reading devices face issues with defective images due to small intervals between media, which can be mitigated by increasing intervals but at the cost of reduced reading speed, and struggle to accurately detect the leading and trailing ends of skewed media.
Innovation Solution
An image reading device with a first conveying unit, a second conveying unit, and an imaging unit that captures and generates image data to detect the media, allowing for precise determination of scan areas and optimal interval settings between sheets, enabling accurate detection of media ends even when skewed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the intervals between media are increased to suppress defective images, then image quality is improved, but reading speed is reduced
Solution Approach 1:
The system performs preliminary detection of media presence and position using image data before completing the scanning process. This allows the conveying units to be stopped or slowed down in advance before the media reaches the imaging unit, ensuring proper spacing is maintained without requiring excessively large intervals between all media sheets.
2Productivity
If the intervals between media are decreased to increase reading speed, then productivity is improved, but defective images occur
Solution Approach 1:
The system uses image data from the imaging unit as feedback to detect whether media is present and to determine the timing for stopping the conveying units. This feedback mechanism allows the system to dynamically adjust conveying timing based on actual media detection, enabling smaller intervals between media while preventing defective images through precise control.
3Device complexity
If conventional detection methods are used for media ends, then device complexity is reduced, but detection precision deteriorates for skewed media
Solution Approach 1:
The system replaces mechanical or simple optical detection methods with image-based detection using the imaging unit. By capturing images of the media and analyzing the image data to detect media ends, the system achieves high detection precision for skewed media without requiring complex mechanical detection mechanisms.
Data Source
AI summary
An image reading device includes a first conveying unit that sequentially feeds a plurality of media placed in a tray one by one in a conveying direction, a second conveying unit disposed downstream of the first conveying unit in the conveying direction and conveys a medium among the plurality of media fed by the first conveying unit in the conveying direction, and an imaging unit disposed downstream of the second conveying unit in the conveying direction. The imaging unit captures an image of the medium conveyed thereto and generates image data of the medium.The image reading device detects the medium conveyed based on the image data, and stops conveying a next medium subsequent to the medium conveyed before the first conveying unit starts conveying the next medium. The image reading device resumes conveying the next medium when the medium conveyed is no longer detected based on the image data.