Inspection Unit Fault Verification Using Reference Body
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Solution Overview
Problem
Existing substrate inspection systems lack an automated method to verify the fault of inspection units, leading to undetected performance deterioration and the production of improperly inspected PCBs.
Innovation Solution
A method and system for verifying the fault of inspection units by using a verification reference body with fiducial markers and a height marker, which allows for the extraction of movement and height errors from image data, and generates a verification result indicating the presence of faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual checking of inspection results is performed, then fault detection is possible, but productivity is reduced due to frequent manual interventions and recalibrations
Solution Approach 1:
The inspection system performs self-verification by automatically capturing images of the verification reference body and analyzing movement errors and height errors without requiring manual intervention. The system autonomously detects faults and triggers recalibration only when necessary, enabling continuous operation and maintaining high productivity while ensuring reliability through automated self-checks.
2Measurement precision
If frequent manual calibration is performed, then inspection accuracy is maintained, but loss of time increases due to system stoppages
Solution Approach 1:
The system performs preliminary verification by continuously monitoring movement errors and height errors using the verification reference body. By detecting faults in advance through automated image analysis, the system can schedule recalibration during planned maintenance windows rather than performing emergency stoppages, thus maintaining inspection accuracy while minimizing unplanned downtime and preserving productivity.
3Productivity
If automated fault verification is implemented, then productivity is improved by reducing manual checks, but device complexity increases due to additional verification components
Solution Approach 1:
The verification reference body serves multiple functions: it provides fiducial markers for movement error verification, height markers for height error verification, and flat areas for focus verification. By using a single multi-functional reference body instead of multiple separate verification components, the system achieves automated fault verification and improved productivity while minimizing the increase in device complexity.
4Reliability
If continuous monitoring is performed, then reliability is improved by detecting faults early, but use of energy increases due to constant operation
Solution Approach 1:
The system performs periodic verification by capturing images of the verification reference body at predetermined intervals or based on inspection counts. This periodic monitoring approach maintains high fault detection reliability by regularly checking for movement errors, height errors, and focus errors, while consuming minimal energy compared to continuous monitoring, thus achieving an optimal balance between reliability and energy efficiency.
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 solution enables automatic detection of inspection unit faults, preventing the manufacture of improperly inspected PCBs and improving yield rates by reducing the need for manual checks and recalibrations.
Implementation Method 1
obtaining image data of the verification reference body through the inspection unit
Data Source
AI summary
A method of verifying a fault of an inspection unit, an inspection apparatus, and an inspection system are disclosed. The method according to the present disclosure includes: providing a verification reference body which is formed on a frame attached to an inspection system; placing the inspection unit on the verification reference body; obtaining image data of the verification reference body through the inspection unit; verifying a fault of the inspection unit by extracting a movement error and height error of the inspection unit from the image data; and generating a verification result indicating the fault of the inspection unit.