Defect inspection of coating films | Striations, pinholes, foreign objects, unevenness
Defect inspection of film and coating surfaces determines the lighting method based on whether you want to see streaks, pinholes, foreign objects, or unevenness. Holes are viewed with transmitted light, foreign objects with both reflected and transmitted light, and streaks and unevenness with angled or diffused light. If you want to quantify the height of foreign objects or the unevenness of streaks, consider using 3D imaging. The thickness of the coating itself does not appear in images, so it should be combined with dedicated measurement methods. [Key Points] - The lighting method varies for each type of defect. - Holes and foreign objects are easier to see in 2D, and the thickness of the film itself does not appear in images. - The moving sheet is not stopped; it is captured line by line with a line camera. *For detailed explanations, please refer to the technical notes and downloadable materials in the related links.
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basic information
**Contents of this Technical Note** - Defects that are problematic on the coated surface include streaks, pinholes, foreign substances, and unevenness. - The difficulty in inspecting the coated surface arises from the defects being thin and the base being non-uniform. - Pinholes, foreign substances, and unevenness are measured in 2D, while the height of protrusions is measured in 3D, and the thickness of the film is measured differently. - The flowing sheet should not be stopped; instead, use a combination of reflection and transmission for imaging. - Investigate the cause of coating defects based on their location. - Transparent coatings and very shallow thickness variations are difficult to see. - Compare the visibility of coated samples with streaks and pinholes under different lighting conditions. **Consultation** We will confirm whether it can be measured or captured with your workpiece by checking the actual item. Please consult us with a photo.
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The technical notes can be read by anyone from the related links. We will discuss the costs of development and testing based on the details provided.
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Applications/Examples of results
【Frequently Asked Questions】 Q. How small of a pinhole can be seen? A. It depends on the size of one pixel and the amount of light passing through the hole. There is no definitive guideline, so it's best to check the smallest hole you want to find with a physical sample. Q. Can variations in coating thickness be measured in images? A. The range that appears as differences in brightness can be seen as variations. However, numerical values for thickness cannot be obtained from the image. If thickness values are the standard, it is recommended to combine with dedicated measuring methods. Q. Can the types of defects be automatically classified by AI? A. Classification may be possible if there are differences in appearance. If there are no visible differences, AI cannot categorize them either, so it is advisable to first check if differences can be produced with lighting.
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Company information
We specialize in 2D and 3D inspection and measurement technologies using cameras. We possess a wide range of knowledge in optics, mechanics, electronics, and software, enabling us to provide technical support for both hardware and software. Not only do we have personnel with experience working as researchers at image inspection device manufacturers, major electronic component manufacturers, and universities, but we also have numerous successful implementations of developed products in actual production environments, making our ability to adapt advanced technology to on-site needs a strong point. Additionally, we are skilled not only in developing proprietary algorithms but also in using off-the-shelf products such as image processing controllers from Keyence and Omron, allowing us to excel in selecting and utilizing the most suitable equipment for specific needs. In recent years, while AI technology has garnered attention, there are cases where utilizing 2D and 3D technologies can be implemented more easily than AI, and cases where optical devices and mechanical jigs can improve performance and reduce software load. We offer services related to image systems, including "equipment selection," "implementation support," "performance improvement of existing equipment," "technology development," and "joint development," so please feel free to consult with us first.
