How to Measure Warpage of Glass Substrates | Issues with Transparent Bodies and Support Methods
Warping of glass and substrates is measured by assessing the height across the entire surface and determining the deviation from a reference plane. Opaque substrates can be measured all at once using a 3D stripe method. Transparent glass requires careful selection of measurement methods due to light passing through or reflecting off the back surface. Thin plates can change shape depending on how they are supported, so the placement method must also be decided. 【Key Points】 ■ Warping is expressed in terms of the height across the entire surface and the deviation from the reference plane. ■ Transparent glass requires careful selection of measurement methods due to light transmission. ■ The shape can change based on placement and weight, so the support method must also be determined. *For detailed explanations, please refer to the technical notes and downloadable materials linked.
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basic information
**Contents of this Technical Note** - What is warping? Differences from waviness and flatness - To measure warping, take the height of the entire surface at once - The difficulty in measuring transparent glass is due to light passing through and reflecting off the back surface - The challenges specific to each object and guidelines for appropriate measurement methods - Issues where numbers change depending on limits and how they are supported - Determine how to support and check warping using actual glass and substrates **Consultation** I will confirm whether it can be measured or captured with your work by checking the actual item. Please consult with a single 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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【Frequently Asked Questions】 Q. What is the difference between measuring with a gap gauge on a flat plate and other methods? A. The gap gauge is suitable for checking several points. 3D measurements provide the height distribution across the entire surface, allowing you to record where and in which direction it is warped numerically. Q. Do I need to spray a transparent glass to measure it? A. Spraying makes it easier to measure, but if the product cannot be contaminated, it cannot be used. In that case, we will compare methods using surface reflection or focal points to see if it can be measured without spraying. Q. How do you measure a large plate that bends under its own weight? A. We determine a support method that is close to the actual usage condition and measure it. There is also a method where you change the support and measure several times to see the differences in the numbers.
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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.
