Circuit Board Inspection Reference Data Generation
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Solution Overview
Problem
The existing methods for generating reference data for circuit board inspection are inefficient as they rely on the time-consuming process of creating CAD information, which needs to be repeated if errors occur, and do not account for distortions in the circuit board shape during inspection.
Innovation Solution
A method that generates a compensation matrix using pad coordinate information from image data and prestored design data to produce reference data without requiring CAD information, allowing for efficient inspection by applying this matrix to the image information of the bare circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CAD information is generated for circuit board inspection, then reference data can be obtained for inspection, but time consumption increases significantly and efficiency decreases
Solution Approach 1:
The patent applies preliminary action by pre-storing design data including pad coordinate information before inspection is needed. This allows the system to skip the time-consuming CAD information generation step during actual inspection, as the necessary reference data is already prepared and can be quickly retrieved and applied to generate reference data from captured images.
Solution Approach 2:
The patent uses copying by creating reference data through transforming captured image information using a compensation matrix, rather than generating reference data from scratch through CAD processes. The system captures an image of the circuit board, extracts pad coordinates, generates a compensation matrix, and applies it to create reference data that copies the essential geometric information needed for inspection without requiring full CAD generation.
2Reliability
If traditional reference data generation methods are used, then inspection can be performed, but the process requires repeated CAD generation which reduces productivity
Solution Approach 1:
The patent applies self-service by enabling the inspection system to generate its own reference data autonomously from captured images and pre-stored design data, without requiring external CAD information generation processes. The system automatically extracts pad coordinates from images, generates compensation matrices, and creates reference data independently, eliminating the need for repeated manual or automated CAD generation and significantly improving inspection productivity.
3Measurement precision
If CAD information is generated to account for circuit board distortions, then measurement accuracy improves, but the complexity of the process increases
Solution Approach 1:
The patent applies extraction by isolating and using only the essential pad coordinate information from design data, rather than requiring complete CAD information including all circuit patterns, holes, and other features. By extracting just the pad coordinates needed for distortion compensation and reference data generation, the system achieves accurate distortion correction with a simplified process that avoids the complexity of full CAD generation.
Data Source
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AI summary
The present invention relates to a method of generating reference data for inspecting a circuit board. The method comprises steps of scanning a bare circuit board to obtain image information of the bare circuit board, generating a compensation matrix using pad coordinate information extracted from the image information and pad coordinate information prestored in design data, and generating, by applying the compensation matrix to the image information, a reference data including coordinate information of a distinctive object. According to the method, inspection efficiency may optimized through quickly generating reference data without CAD information necessary for circuit board inspection.