Reading Apparatus Edge Detection via Protrusive Part
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Solution Overview
Problem
Conventional reading apparatuses with white reference parts and black reference parts, used for setting the origin point, often suffer from displacement issues due to adhesive tape placement, leading to incomplete reading of original documents, especially near the leading edge.
Innovation Solution
A reading apparatus with a document placement plate, a reader, a driving device, and a controller, featuring an alignment part and a protrusive part with uneven surfaces, allows the reader to detect edges and determine the reading range based on image data, enabling closer reading to the leading edge of the original document.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive tape is used to form white reference part and black reference part on FB cover, then manufacturing cost is reduced and ease of manufacture is improved, but positioning precision deteriorates due to displacement from correct position
Solution Approach 1:
The patent introduces a protrusive part as an intermediary element between the adhesive tape reference parts and the document placement plate. This protrusive part with its first edge and second edge serves as a mediator to establish a reliable geometric relationship, allowing the system to compensate for the displacement of adhesive tapes while maintaining accurate positioning through the fixed geometric structure of the protrusive part.
Solution Approach 2:
The patent replaces the mechanical adhesive tape positioning system with an optical detection system. Instead of relying on the physical position of adhesive tapes on the FB cover, the system uses the reader to optically detect edges of a protrusive part and calculates the reading range based on these detected positions, thereby eliminating the mechanical displacement issue of adhesive tapes.
2Productivity
If reading range is expanded by setting starting position closer to reference position, then productivity is improved by reading more document, but measurement precision deteriorates due to displacement of adhesive tape
Solution Approach 1:
The patent implements a feedback mechanism where the reader detects the actual positions of the first edge and second edge of the protrusive part, and the controller uses this feedback information to calculate the accurate reading range. This feedback loop allows the system to expand the reading range while maintaining measurement precision by continuously adjusting based on actual detected positions.
Solution Approach 2:
The patent performs preliminary detection of the protrusive part edges before actual document reading. By pre-detecting the positions of the first edge and second edge of the protrusive part and calculating the reading range in advance, the system ensures that the reading range is accurately determined before processing the actual document, thereby maintaining precision while enabling expanded reading coverage.
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 configuration ensures accurate detection of the reading range, allowing the reader to capture a larger portion of the original document, even near the leading edge, by correcting for displacement and ensuring proper alignment.
Implementation Method 1
detect the first edge and the second edge in image data of the protrusive part read by the reader based on an image of the uneven surface
Data Source
AI summary
A reading apparatus, having a document placement plate, a reader, a driving device, a cover, and a controller, is provided. The cover includes an alignment part and a protrusive part. The protrusive part includes an uneven surface and first and second edges forming outer edges of the uneven surface extending in a main scanning direction and in a sub-scanning direction, respectively. The controller is configured control the driving device to move the reader in the sub-scanning direction and the reader while being moved to read the protrusive part, and detect the first edge and the second edge in image data of the protrusive part read by the reader based on an image of the uneven surface and determine a reading range for the reader in the document placement plate based on positions of the first edge and the second edge.