Fasteners are critical and indispensable locking components in mechanical assembly. Submillimeter fasteners are massively and widely used in electronic devices. This study proposed an adjustable panoramic inspection system for M2 to M0.8 submillimeter fasteners. The system mainly consists of a panoramic imaging module, a back-light module, and an image grabbing and computing module. The panoramic imaging module would form four equal optical path lengths to keep the same imaging amplification between the different directions of the field of view. The back-light module was designed to provide uniform illumination and enhance the contrast of the pitch edge between the fasteners and the background. The image grabbing and computing module with a high-speed camera was designed to be adjustable for different sizes of submillimeter fasteners. The realized system can offer the function of four images in one shot to make a panoramic scene, independent illumination for recognizing, inspect screws from M0.8 to M2.0 screws, and short time consumption of image processing, such as 3.284 ms for M0.8 screws and 2.384 ms for M2.0 screws, to achieve examination of 6000 pieces in 1 min. (C) 2020 Optical Society of America.
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机译：紧固件是机械组件中的关键和不可或缺的锁定部件。 Subsilimeter紧固件是大规模的，广泛用于电子设备。该研究提出了一种用于M2至M0.8亚颌母紧固件的可调节全景检测系统。该系统主要由全景成像模块，背光模块和图像抓取和计算模块组成。全景成像模块将形成四个相等的光路长度，以在视野的不同方向之间保持相同的成像放大。背光模块被设计为提供均匀的照明，并增强紧固件和背景之间的间距边缘的对比度。具有高速摄像头的图像抓取和计算模块设计用于不同尺寸的亚颌胶紧固件。实现系统可以在一次拍摄中提供四个图像的功能，以制作全景场景，独立照明来识别，检查来自M0.8到M2.0螺钉的螺钉，以及图像处理的短时间消耗，例如M0为3.284 ms .8螺钉和2.384毫秒用于M2.0螺钉，在1分钟内实现6000件的检查。 （c）2020美国光学学会。
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