Sheet Inspection Using Vertex Angles to Detect Deformation
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Solution Overview
Problem
Existing image forming apparatuses falsely detect streaks caused by sheet deformations as defects, leading to inaccurate detection of actual deformations and potential failure to detect them altogether.
Innovation Solution
An inspection device and method that utilize a reader and circuitry to detect vertices on a medium, calculate angles at these vertices, and determine the presence of deformations by comparing the angles to a predetermined range, accurately identifying sheet deformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the detection level is raised to accurately detect deformations, then deformation detection accuracy is improved, but false detection of streaks increases
Solution Approach 1:
The inspection device segments the inspection target into multiple regions including vertex regions and non-vertex regions. Different detection methods are applied to different regions: angle calculation at vertices and streak detection in non-vertex areas. This segmentation allows simultaneous optimization for both deformation detection accuracy and false detection reduction.
Solution Approach 2:
The device applies different detection criteria to different locations of the inspection target. At vertex regions, it calculates angles between adjacent sides to detect deformations. In non-vertex regions, it detects streaks using other criteria. This local quality approach ensures high detection accuracy where needed while minimizing false positives in other areas.
2Reliability
If the detection level is lowered to avoid false detection of streaks, then false detection rate is reduced, but deformation detection accuracy deteriorates
Solution Approach 1:
By dividing the inspection target into vertex regions and non-vertex regions, the system can maintain lower overall detection sensitivity while preserving high local sensitivity at vertices through angle calculation. This ensures reliable operation without missing deformations.
Solution Approach 2:
The system maintains high detection capability at vertex locations through angle calculation while using more conservative detection criteria in non-vertex regions. This local differentiation allows the system to avoid false detections overall while maintaining accuracy where deformations are most likely to occur.
3Measurement precision
If angle calculation is performed at all vertices, then deformation detection coverage is improved, but processing complexity increases
Solution Approach 1:
The system segments vertices into different types (e.g., four corners vs. other vertices) and applies angle calculation selectively. This segmentation reduces the number of calculations required while maintaining comprehensive deformation detection coverage at critical locations.
Solution Approach 2:
The device applies angle calculation primarily to corner vertices where deformations are most critical, rather than uniformly to all vertices. This local quality approach optimizes processing efficiency while maintaining effective deformation detection coverage.
Data Source
AI summary
An inspection device includes a reader to read data of an inspection target; and circuitry that detects a vertex of the inspection target from the read data of the inspection target; calculates an angle indicating a shape of the inspection target at the detected vertex; and determines whether a deformation is present in the inspection target, and the circuitry determines that a deformation is present in the inspection target when the calculated angle is outside a predetermined range.