Inspection Apparatus Reader Defect Exclusion for Printing Quality
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Solution Overview
Problem
In printing systems, users are unable to distinguish between defects caused by the printing process and those caused by dirt on the reader, leading to unnecessary cleaning and reduced productivity, as current techniques require manual cleaning to address reader defects without differentiation.
Innovation Solution
An inspection apparatus generates a second inspection target image by reading a reference face without passing a sheet, detects defects in this image, and sets an inspection exclusion area to differentiate between reader defects and printing defects, thereby avoiding unnecessary cleaning recommendations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the reader is cleaned to eliminate defects, then the reading accuracy is improved, but the productivity is reduced due to unnecessary cleaning operations
Solution Approach 1:
The system performs preliminary defect detection by reading a reference face before actual printing to identify reader defects in advance. This allows the system to distinguish between reader defects and printing defects, preventing unnecessary cleaning operations and maintaining productivity while ensuring reading accuracy through targeted maintenance only when actually needed.
2Reliability
If the reader is cleaned frequently to ensure accurate defect detection, then the inspection reliability is improved, but the loss of time increases due to repeated cleaning interruptions
Solution Approach 1:
The system performs preliminary defect detection by reading a reference face before actual printing to identify reader defects in advance. This allows the system to distinguish between reader defects and printing defects, preventing unnecessary cleaning operations and maintaining productivity while ensuring reading accuracy through targeted maintenance only when actually needed.
3Manufacturing precision
If the inspection area includes the entire sheet, then the manufacturing precision is improved, but the defect detection accuracy deteriorates due to reader defects being mistaken for printing defects
Solution Approach 1:
The system performs preliminary defect detection by reading a reference face before actual printing to identify reader defects in advance. This allows the system to distinguish between reader defects and printing defects, preventing unnecessary cleaning operations and maintaining productivity while ensuring reading accuracy through targeted maintenance only when actually needed.
Solution Approach 2:
The system extracts and identifies the positions of reader defects detected during reference face reading. These defect positions are then excluded from the inspection area during actual printing inspection, allowing the system to focus only on genuine printing defects and accurately evaluate printing quality without interference from reader defects.
Data Source
AI summary
An inspection apparatus, an inspection method, and a program stored on a recording medium, each of which generates a second inspection target image, based on a result of a reader reading a reference face; detects a defect in the second inspection target image; generates a first inspection target image, based on an image read at the reader from a printed matter printed at a printing apparatus; determines a defect in the printed matter, based on the first inspection target image and a master image generated from print data of the printed matter; and in a case where the defect is detected in the second inspection target image, excludes a position of the detected defect from an area where a defect in the printed matter is inspected.