Study And Application Of The Inspection System Of PCB

Printed Circuit Borad (PCB) plays an important role in modern electronic equipment and electronic products. It is an information carrier that integrates all kinds of electronic components and is widely applied to many fields. Along with the constant development of technology and continuous progress of industry, electronic products tend to become lighter, thinner, shorter and smaller. This makes PCB manufacture technology developing towards high-density. The PCB quality affects the capability of products directly. At present PCB quality test works are mostly completed by manual eyeballing. As the subjective factors'effects, missing and mistaken in test often happen. So it is urgent needed to take online automatic optical test into the PCB industry.This paper offers a PCB automatic test method by using optical video technology, microcomputer control technology and image process technology etc. This method put forward an operable and practical scheme to develop an efficient, steady, accurate and automatic PCB test system.In this paper, The main research contents are as follows:1. Firstly, it introduced the present situation and future development of PCB test technology.2. For the composing of PCB test system and the property of equipments, we study to choose the super-resolution CCD; How to integrate computer visual technology, accurate machine technology, autocontrol technology and image process technology; How to solve the conflict between high definition and wide visual range; How to accomplish image automatic joint; How to implement accurate orientation of three-dimensional work flat. We put emphasis on topics.3. We introduced elementary principle and method of digital image process.4. We analysed the characters of system composing, primary flow of software system, arithmetic of the hole center's orientation and the hole diameter's obtaining, arithmetic of the final data error analysis.By the test, experimental datas proved: In this paper, by the practical arithmetic using image process technology, it can make accurate test on the precision of PCB hole drilling and hole diameter. This showed the method have credible stability and...