PCB Inspection Area Distortion Compensation via Adjacent Feature Extraction
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Solution Overview
Problem
Conventional shape measurement apparatuses struggle to accurately set inspection areas on distorted printed circuit boards due to warpage or contortion, leading to incorrect location settings and measurement errors.
Innovation Solution
The method involves setting multiple measurement areas on the board, acquiring reference and measurement data from adjacent areas, extracting feature objects to determine distortion degrees, and compensating for distortion to correctly set the inspection area, even when there is limited shape information available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an inspection area is set based on theoretical location without distortion compensation, then the inspection process is simple and fast, but the inspection area is incorrectly positioned due to board warpage or contortion
Solution Approach 1:
The patent applies preliminary action by acquiring reference data and extracting feature objects from adjacent measurement areas before setting the inspection area. This preliminary extraction of feature objects from neighboring regions enables distortion compensation to be performed in advance, ensuring the inspection area is correctly positioned without requiring complex real-time adjustments during the inspection process
Solution Approach 2:
The patent uses feature objects extracted from adjacent measurement areas as intermediaries to establish the conversion relation between reference and measurement data. These feature objects serve as reference points that mediate the distortion compensation process, allowing the system to calculate and apply distortion values without directly measuring the target inspection area itself
2Measurement precision
If feature objects are extracted only from the target measurement area, then the process is simple, but insufficient feature objects lead to inadequate distortion compensation
Solution Approach 1:
The patent applies segmentation by dividing the measurement process into multiple measurement areas, with the target measurement area and surrounding adjacent measurement areas. This segmentation allows feature objects to be extracted from multiple distinct regions, increasing the pool of available feature objects for distortion compensation while maintaining organized, manageable data structures
Solution Approach 2:
The patent implements universality by using feature objects from adjacent measurement areas for multiple purposes: they serve as reference points for distortion compensation, provide additional geometric constraints for conversion relations, and can be used to validate measurement consistency across different regions of the workpiece
Data Source
AI summary
In order to set an inspection area in an inspection apparatus for inspecting a board, a plurality of measurement areas are set on a board, and then reference data and measurement data of at least one adjacent measurement area that is adjacent to a target measurement area for inspecting a measurement target, among the measurement areas, are acquired. Thereafter, at least one feature object is extracted from the adjacent measurement area. Then, a distortion degree is acquired by comparing reference data and measurement data corresponding to the feature object with each other, and thereafter the distortion degree is compensated for, to set an inspection area in the target measurement area. Thus, a conversion relation between the reference data and the measurement data may be correctly acquired, and an inspection area, in which distortion is compensated for, may be correctly set.