AOI automatic optical inspection system manufacturer

AOI (automatic optical inspection) is referred to as automatic optical inspection system, which will play an increasingly important role in semiconductor and electronic circuit inspection. Its advantages are to save manpower, reduce costs, improve production efficiency, unify testing standards and eliminate human factor interference, ensure the stability, repeatability and accuracy of testing results, timely find product defects, ensure shipment quality, and have the detection ability of high degree of automation, fast detection speed and high resolution.

AOI can be divided into four parts: precision mechanical system, control system, image processing system, and software system according to technology.

1. Precision mechanical system:

When AOI is used to inspect each PCB board, the table of the AOI system must automatically move to the camera position for image acquisition, and even if the program has set the data related to these movements, if the parameters in the parameters are changed due to changes in the accuracy of mechanical movements, etc., the correct inspection process will not be completed. The movement trajectory of the workbench should be precise and accurate to ensure the accurate positioning of subsequent detection.

2. Control system:

The control system of AOI is composed of a main control computer, a motion control card, an image acquisition card, an I/O interface board, etc., to realize the three-dimensional coordinates and peripheral I/O interface control, to ensure the accuracy and fast response of the movement, and to cooperate with the mechanical and vision modules to realize the function of the whole machine. The control system of AOI mainly completes: X, Y precision worktable motion control, Z-axis direction motion control, convenient image acquisition, and flexible control of the direction of the detected items.

3. Image processing system:

The image processing system is called CCD vision system, which is mainly composed of a camera, an image grabber, and an LED program-controlled light source. The video image signal obtained by the camera is transmitted to the image acquisition card, and the image acquisition is completed by the control image acquisition card, and the main control computer processes the video image of the collection, and the result is returned to the main control program, and the image can be observed in real time through the display and other corresponding control processes can be completed.

4. Software system:

AOI software system is mainly composed of motion control, visual processing and algorithms, users can complete a variety of motion control and visual recognition through the window interface, AOI system software supports process data programming, can realize the WYSIWYG characteristics of process programming, supports a variety of operation simulation and simulation, so that operators can verify and test operation data before batch operation, and avoid missed detection and false detection.

Xinxiwang independently developed AOI automatic optical inspection system, which has the following characteristics:

1) Tool simplification

Users can change the tool modules in the visual framework according to the specific needs of the project, and the output parameters of the interface can also be set according to the actual needs. It is easy to use for the operator, which greatly shortens the on-site commissioning time of the project and improves the development efficiency of the project. At the same time, it is also conducive to the later maintenance of the project, and only a simple training of on-site operators is required to deal with the abnormalities in the actual production process.

2) Functional modularity

According to the processing process, the program is divided into several functional modules in the AOI system framework, and these functional modules only need to change the input and output parameters of the specific visual tools and modules in them to regenerate a new program. The modularization of the system framework function greatly simplifies the difficulty of the framework, which is more convenient for users to operate, and the divided modules are easy to be reused between different programs, which can reduce development time and improve development efficiency.

3) Intelligent processing

Under the development characteristics of miniaturization, high density, rapid assembly and variety diversification of the products to be tested, the amount of detection information is large and complex, and the requirements for detection accuracy and operation speed are getting higher and higher. The new Xiwang AOI inspection system not only meets the requirements of high-speed inspection in complex environments, but also has deep learning functions, which can tolerate deviations and unpredictable defects for the detection of surface defects, texture and material classification, assembly verification and deformation part positioning, character reading and distortion printing, etc., with reliable, easy to match and high-speed characteristics.

4) Data visualization

In the actual production process, pictures and data can be stored according to requirements. The images that can be stored include original pictures, screenshots, NG pictures and other pictures, and can simulate the actual production process and analyze product data according to the stored pictures. The storable data can be set in the system framework and can be stored according to the actual production. The software can record the data of the production process in real time, which is more in line with the requirements of Industry 4.0, and achieves real-time production data, accurate data, and key data focus. The software also has SPC (Statistics Process Control) function, which can draw a control chart for analysis for the actual production data, and judge the abnormality of the entire production process and the law of product data through the control chart. At the same time, the use of statistical data to monitor the production process is conducive to stabilizing production and improving yield.

5) Convenient operation

The user-friendly operation interface can set the number of analog cameras according to actual needs, and multiple cameras can be operated at the same time. After the delivery of the system software, only a simple training of the operator is needed to deal with the subsequent production line abnormalities and production alarms, and the on-site line watchers are not required to have professional visual knowledge, which greatly reduces the later system maintenance costs and processing time. In particular, when the production line is replaced with a new product, it only takes a small amount of time to replace the new product, and there is no need for a long downtime.

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