With the increasing demand for green energy in the global market, the output of solar cells / panels is increasing substantially. Therefore, high-speed and accurate solar cell / panel production line testing will be the key to ensure product quality and increase production capacity, and to a large extent determine the profit margin and market competitiveness of manufacturers.
In this regard, Deng Hui, COGNEX China product manager, believes that how to quickly and efficiently produce large-size qualified wafers will become an important issue facing solar cell manufacturers. He emphasized that the key technology of machine vision systems is software, and the current trend of increasingly integrated and miniaturized hardware is also obvious. In the future, the use of 3D cameras is generally optimistic in the market demand prospects. For example, how to carry out 3D object grabbing and how to grab on an inclined surface are all worthy of research.
The company's recently launched DataMan 500 is a highlight. Deng Hui said that DataMan 500 uses Cognex IDMax advanced code reading software, which can read one-dimensional barcodes that cannot be read by laser readers, including damage, deformation, blur, scratches, low height and low contrast The encoding achieves a higher reading rate. The DataMan 500 can process images at up to 1,000 frames per second. It can also read codes, data matrices and QR codes from any direction, as well as multiple codes in the same image.
In addition, DataMan 500 also provides a variety of other advantages, including automatic triggering, automatic focusing, and "no read" feedback. The host supports standard C-mount lenses and various focal length options. The autofocus feature uses liquid lens technology, which provides maximum flexibility in the operating range for the highest speed applications. This proven new technology has been integrated with Cognex industrial barcode readers, which are fast, reliable, and provide high optical quality with low power consumption.
According to information provided by Cognex, the company's four major product lines are currently widely used in the field of solar cell production, especially In-Sight smart cameras and VisionPro vision software. For example, the In-Sight smart camera is used to monitor the size of the ingot in the crystal pulling process, and the diameter of the ingot is more accurate and consistent with the control system; in the wafer printing process, special visual tools are used to detect the bus bar and grid line Quality, to determine whether there is a break, whether the wafer itself is damaged, missing corners, cracks, etc. In the assembly process, use the PatMax algorithm to accurately locate the position and angle of the wafer, so that the robot can accurately and quickly perform automatic assembly.
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