Electrode sheet and metal foil defect inspection | Striations, pinholes, coating edges
In the inspection of sheets coated with a film on metal foil, like electrode sheets, we look for streaks, pinholes, foreign objects, the position of the coating edge, and wrinkles or undulations in the foil. The presence or absence and position can be seen with a 2D line camera, but since the shiny foil and the dark coating appear in the same image, the visibility of defects changes depending on the lighting. When we want to see the height of protrusions and the shape of wrinkles in numerical form, we consider using 3D. [Key Points] - The shiny foil and dark coating are adjacent, so the appearance changes with lighting. - The position of the coating edge can be measured in 2D as the boundary between light and dark. - If you want to see the height of protrusions and the shape of wrinkles in numerical form, 3D should be added. *For detailed explanations, please refer to the technical notes in the related links and the downloadable materials.
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basic information
【Contents of this Technical Note】 ■ The defects we want to see in electrode sheets and metal foils are streaks, pinholes, protrusions, coating edges, and wrinkles. ■ The difficulty in inspecting electrode sheets arises from the juxtaposition of shiny foils and dark coatings. ■ Pinholes and coating edges are 2D, while the height of protrusions and the shape of wrinkles are 3D. ■ The concept of lighting to capture shiny foils and dark coatings as they flow. ■ Recording the positional deviation between the coating edge and the front and back. ■ Defects on the dark coating, small burrs at cut edges, and differences in thickness are hard to see. ■ Confirming the visibility for each lighting condition with actual combinations of foils and coatings. 【Consultation】 We will verify whether it can be measured or captured with the work at hand using the actual items. 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. Can you distinguish between wrinkles and defects in the foil by looking at images? A. Wrinkles often change the reflection of light as waves, while defects usually result in local differences in brightness. If it's difficult to distinguish, viewing the shape in 3D can help. Q. If I only want to check the misalignment of the coating edge, is 2D sufficient? A. If the boundary between light and dark is clear, 2D is sufficient. Adjust the lighting and verify with the actual item whether the boundary appears stable. Q. Can the thickness of the coating be measured from images? A. It can only be seen indirectly as variations from the differences in brightness. Measuring in 3D is also limited to the surface height, so if you want to manage thickness numerically, it should be combined with dedicated measuring tools.
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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.
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