Print Inspection Apparatus Dynamic Reference Range Post-Cleaning
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Solution Overview
Problem
Existing print inspection methods struggle to accurately determine the operative condition of a printer after cleaning, leading to reduced reliability in detecting abnormalities and maintaining print quality due to the same reference range being used for both immediate post-cleaning and normal operating times.
Innovation Solution
A print inspection method and apparatus that utilize a special reference range for the immediate post-cleaning period, set for a smaller paste amount than the normal range, allowing for distinct evaluation of measurement values during cleaning and normal operation, enabling more appropriate judgment of operative condition changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same reference range is used for operative condition determination both immediately after cleaning and during normal operation, then the inspection process is simple, but the reliability of abnormality detection deteriorates due to paste amount variations after cleaning
Solution Approach 1:
The reference range for operative condition determination is made dynamic by switching between a first reference range (immediately after cleaning) and a second reference range (during normal operation). This dynamic adjustment allows the system to adapt to different operational states, maintaining high reliability in abnormality detection without requiring complex manual intervention for reference range selection.
Solution Approach 2:
The patent changes the parameter of reference range values based on the operational state of the mask sheet. By setting different reference range parameters for different time periods (post-cleaning vs. normal operation), the system accounts for the natural variation in paste amount while maintaining accurate abnormality detection capability.
2Manufacturing precision
If the mask sheet is cleaned frequently to prevent clogging, then print quality is maintained, but the paste amount varies significantly after cleaning, making abnormality detection difficult
Solution Approach 1:
The system performs preliminary action by setting a specific first reference range that accounts for the expected paste amount reduction immediately after cleaning. This preparatory measure allows the inspection system to correctly interpret measurement values taken in the post-cleaning period, preventing false abnormality detections while maintaining print quality through regular cleaning.
3Ease of operation
If a single reference range covers all operating conditions, then the determination process is simple, but it cannot distinguish between normal post-cleaning variations and actual printer abnormalities
Solution Approach 1:
The determination process is segmented into distinct phases: a first determination process using the first reference range for measurements immediately after cleaning, and a second determination process using the second reference range for measurements during normal operation. This segmentation preserves important operative condition information while maintaining operational simplicity through automated phase identification and reference range selection.
Data Source
AI summary
A print inspection device is provided with a camera for picking-up an image of a substrate to be processed after a paste is printed on the substrate through a mask sheet by a printer, a measured value calculating a measured value of a printed paste area based on the picked-up image of the substrate, a setting means for setting a standard range for working state judgment of the area, and a comparing and judging means for comparing the measured value with the standard range and for judging whether the printer is in a normal working state or not depending on whether the measured value is in the standard range or not. The setting means sets the standard range to a less paste amount side for a predetermined period of time after the mark sheet is cleaned up than for other periods of time.