Because it is typically registered in the form of label edge data, even if the label overlap occurs, it is still possible to determine the shape of a circle around it, thereby achieving high-precision judgment.
In recent years, due to the rapid development of China's industry, from the industry's perspective, there are mainly electronic components, substrates for electrical products or FPD (Flatpaneldisplay) production. With the development of production, the accuracy requirements of China's domestic production equipment are becoming higher and higher, and the need to increase the accuracy of servo control is also increasing. In order to meet the requirements of the above-mentioned high-precision device, here is a description of one of the cases of using a visual sensor to achieve high-precision positioning control. The machines used in this control, from sensors and PLCs to servo control, are all OMRON products. With a company's products, the entire system is controlled.
Description of the overall control
Here I will briefly explain the overall control content. This is a case of FPD glass substrate position correction. As an application of this control, it can also be applied to the bonding of FPD glass substrates, the correction of substrate positions of electrical products, and the correction of positions during processing of electronic components. Generally, the mechanical worktable is composed of the X-axis, Y-axis, and the drive shaft of the shaft, and a visual sensor to determine the load on the worktable is used to perform data calculation between the two and then constitute the servo control that drives the mechanical worktable whole system.
â‘ For the load to be processed, in order for the visual sensor to be discriminated, a mark needs to be printed. For better accuracy, more than 2 marks are required.
â‘¡The load is placed on the mechanical table for processing.
â‘¡ The visual sensor discriminates the mark printed on the above load, and compares it with the previously set (memorized) position, and then calculates the error with high accuracy.
â‘¢ The error calculated by the vision sensor is converted into the amount of mechanical movement by the PLC, and the position where the error is corrected is determined and executed.
Vision sensor
In this control, the most important point for improving accuracy is the position discrimination of the visual sensor. If the vision sensor cannot determine the position with good accuracy, the improved accuracy mentioned in this control cannot be achieved. Our vision sensors can achieve the following functions to improve the accuracy of discrimination from experience and technology.
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