3D Polarity Mark Inspection on PCB Components
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Solution Overview
Problem
Conventional 2D image-based methods struggle to accurately determine the location of polarity marks on printed circuit board components, especially when they have the same color and different heights, making it difficult to assess proper mounting.
Innovation Solution
A method utilizing a three-dimensional shape measurement apparatus that illuminates a measurement target with grating pattern light, captures images to acquire height information, and uses relative location information to detect and verify the presence of polarity marks, distinguishing them from adjacent areas based on height differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If 2D image-based inspection method is used, then the inspection process is simple, but the accuracy of polarity mark location detection deteriorates when the polarity mark has the same color and different height compared to adjacent areas
Solution Approach 1:
The patent transitions from 2D image-based inspection to 3D shape measurement by introducing height information as an additional dimension. The three-dimensional shape measurement apparatus captures not only the planar position but also the height of the polarity mark, enabling accurate detection even when the polarity mark has the same color as adjacent areas. This dimensional expansion allows the system to distinguish polarity marks through height differences that are invisible in 2D images.
2Device complexity
If 2D image-based inspection method is used, then the equipment is simple, but the ability to detect polarity marks with height differences deteriorates
Solution Approach 1:
The patent introduces a three-dimensional shape measurement apparatus that adds height measurement capability to the inspection system. This apparatus uses optical projection and capture techniques to obtain 3D shape information, including height differences, of the inspection target. The height information serves as a new detection dimension that enables the system to identify polarity marks that are indistinguishable in 2D images, thereby improving detection capability without excessive complexity increase.
Solution Approach 2:
The patent replaces traditional mechanical or manual inspection methods with an optical-based three-dimensional measurement system. Instead of physically measuring or visually inspecting polarity marks in 2D, the system uses light projection and optical capture to obtain 3D shape information automatically. This substitution enables non-contact, automated detection of height differences and polarity mark locations.
3Measurement precision
If three-dimensional shape measurement is used, then the polarity mark location detection accuracy is improved, but the inspection time increases
Solution Approach 1:
The patent performs preliminary actions by first acquiring the three-dimensional shape information of the entire inspection target before specifically analyzing polarity mark locations. The system obtains height information for all areas in advance, then uses this pre-acquired data to efficiently locate and verify polarity marks. This preliminary acquisition of 3D data avoids the need for multiple sequential measurements, reducing overall inspection time while maintaining high detection accuracy.
Solution Approach 2:
The patent merges the acquisition of shape information and height information into a single three-dimensional measurement process. Instead of separately measuring position and height, the system captures both pieces of information simultaneously through the 3D shape measurement apparatus. This merging of measurement functions reduces the total inspection time while providing comprehensive data for accurate polarity mark detection.
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
Enables accurate and efficient polarity inspection by comparing theoretical and actual locations of polarity marks, reducing inspection time and improving accuracy, especially for components difficult to judge with 2D images.
Implementation Method 1
the light generated from an illumination device may correspond to grating pattern light, and the captured image may correspond to a pattern image
Data Source
AI summary
In order to inspect a three dimensional shape, a predetermined inspection target component formed on a board is selected as the measurement target, a shape of the inspection target component is acquired, a reference point of the inspection target component is detected, relative location information of a polarity mark formed on the inspection target component with respect to the reference point is acquired, and it is judged whether the inspection target component is good or bad by checking whether the polarity mark exists or not by using the relative location information with respect to the reference point. Thus, the location of the polarity mark may be accurately known, and polarity inspection may be more easily and accurately performed.