Duplex Image Reading Apparatus Error Handling
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Solution Overview
Problem
Conventional image reading apparatuses face issues with duplex scanning, where differences in reading positions for the front and back surfaces of a sheet lead to timing discrepancies, resulting in incomplete scanning due to errors like paper jams, and require users to correctly reorient the sheet for re-scanning, which can alter the content arrangement.
Innovation Solution
The apparatus includes a first and second reading section for scanning opposite sides of a sheet at different positions, a conveyance section for sequential sheet movement, and a control section that determines normal completion of scanning operations, deleting incomplete data if errors occur, allowing unified re-scanning without data processing errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If different reading positions are used for front and back surfaces to simplify design, then device complexity is reduced, but scanning reliability deteriorates due to timing discrepancies causing incomplete scanning
Solution Approach 1:
The control section determines in advance whether scanning operations have ended normally before storing image data. This preliminary check prevents incomplete or erroneous data from being stored, resolving the reliability issue while maintaining the simple different reading position design
Solution Approach 2:
The system implements feedback by monitoring the completion status of scanning operations and using this information to control data storage. The control section receives feedback on whether front and back surface scanning ended normally, and accordingly decides whether to store the image data, ensuring reliability without increasing design complexity
2Manufacturing precision
If scanning operations are monitored for normal completion, then data quality is improved, but device complexity increases due to additional control operations
Solution Approach 1:
The control section performs multiple functions: it controls the reading sections, monitors scanning completion, determines data quality, and controls storage operations. By making the control section universal, the patent improves data quality without adding separate dedicated components, thus avoiding excessive complexity
3Measurement precision
If incomplete image data is prevented from being stored, then information accuracy is improved, but loss of information occurs when erroneous data is deleted
Solution Approach 1:
The system converts the potential harm of storing incomplete data into a benefit by using the detection of abnormal termination as a trigger to delete problematic data. The harm of data loss is transformed into a benefit of maintaining overall data accuracy, ensuring that only complete and valid image data are stored
Data Source
AI summary
An image reading apparatus comprises a first reading section; a second reading section; a conveyance section which conveys the sheet sequentially to the first reading section and the second reading section; a control section which executes a first storage operation of storing image data read by the first reading section in a storage section and a second storage operation of storing image data read by the second reading section in the storage section, determines whether the reading operations of the first reading section and the second reading section, the first and the second storage operations are ended normally and deletes, if any one of the operations is not ended normally, the image data of the sheet not scanned normally stored in the storage section.