Image Reading Device Abnormality Detection and Position Adjustment
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Solution Overview
Problem
Existing image reading devices of the sheet-through type often produce linear abnormal images due to foreign substances or scars on the contact glass, leading to inappropriate warnings and reduced user convenience, as these devices may incorrectly identify issues even when no actual problem exists.
Innovation Solution
An image reading device that changes the reading position along the sub-scanning direction when an abnormality is detected and provides notifications only when the changed position still shows abnormalities, with a setting mechanism to adjust the reference position based on the number of documents passed without abnormalities, ensuring appropriate warnings are given.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device provides warnings when abnormalities are detected, then the reliability of abnormality detection is improved, but false warnings increase reducing user convenience
Solution Approach 1:
The system performs preliminary reading of the reference plate before actual document reading to detect abnormalities in advance. By pre-identifying foreign substances or scars on the contact glass through reference plate analysis, the system can adjust the reading position proactively, preventing false warnings during normal operation and improving detection accuracy for actual abnormalities.
2Measurement precision
If the reading position is changed when abnormalities are detected, then the accuracy of identifying actual issues is improved, but the complexity of the detection system increases
Solution Approach 1:
The system uses a reference plate that copies or replicates the contact glass surface properties to detect abnormalities. By reading the reference plate under the same optical conditions as actual documents, the system can identify whether detected abnormalities are due to contact glass issues (foreign substances, scars) without requiring complex additional detection hardware.
3Productivity
If the device reads documents continuously, then the productivity is improved, but the accumulation of paper powders and foreign substances increases causing more abnormalities
Solution Approach 1:
The system continuously monitors the reading quality by comparing document readings with reference plate readings. When abnormalities are detected during continuous operation, the system provides feedback by notifying the user and automatically adjusting the reading position, enabling continuous productivity while compensating for accumulated foreign substances through dynamic position correction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces false warnings and improves user convenience by accurately identifying and addressing actual issues on the contact glass, while minimizing unnecessary alerts.
Implementation Method 1
reading an image of the document from other main surface side of the transparent plate by emitting light rays from a light source and receiving light rays reflected from the document
Data Source
AI summary
An image reading device reads out an image of a document being conveyed above one main surface of a contact glass, changes a document reading position if the image has an abnormality, and gives a warning if the changed document reading position is located at a predetermined reference position. The image reading device has a setting portion for changing the reference position in accordance with the number of documents that have passed the document reading position during the time when no abnormality in images is obtained by reading the documents.