Development and application fields of machine vision inspection equipment

With the wide application of 3C digital devices, the requirements of smart phone’s large screen, precision touch and high wear resistance make capacitive screen gradually replace resistance screen as the mainstream touch screen. From the perspective of structure, the capacitive screen touch film group is composed of cover plate, sensor module and LCD panel. No matter what touch solution is, the cover plate glass is an indispensable part of the capacitive screen, and the consumer demand driving materials are constantly upgraded, Accelerated the upgrading and development of the glass cover plate industry.
Of course, the industrial chain of the cover glass industry is not only used for 3C digital equipment, but also can distinguish specific applications according to the product thickness: alkali aluminum glass products with a thickness of 0.2-0.4mm are mainly used for mounting (toughened film); Products with thickness of 0.5-0.95mm are mainly used for smart phones, tablets, laptops and other smart touch display devices; Products with a thickness of more than 1mm are mainly used for various large touch and display devices (including car central control display cover, public inquiry terminal, industrial control equipment, etc.), car windshield, special building glass, etc.

With the production capacity improvement and supply chain integration of the intelligent terminal market in China, especially in the Pearl River Delta, the glass cover plate detection industry is bound to usher in explosive growth. At the same time, there are many problems in the glass cover plate detection field at home and abroad, and the industry urgently needs the emergence of innovative glass cover plate detection equipment.

As one of the most important components of intelligent terminal products, glass cover plate manufacturing has a huge market stock and growth potential, which is the focus of many countries and enterprises. The production process of glass cover plate is complex, especially after entering the era of 2.5D and 3D cover plate, due to the introduction of more complex processes and the continuous improvement of the final customer’s appearance requirements, various kinds of defects with different characteristics will inevitably occur in the production process, including scratches, pits, poor screen printing, impurities, and other appearance defects. The defects of various features require the inspector to constantly flip the cover plate and capture them under some specific light angle or observation angle. This puts forward very high requirements for the design and manufacture of automatic inspection equipment for glass cover plate, which is used to replace manual visual inspection.

As the last process of glass cover plate production, detection is the key to product quality control. However, at present, domestic enterprises basically use manual visual inspection in the detection of glass cover plates. However, manual visual inspection faces many defects such as low efficiency, high rate of missing inspection, and rising labor costs. In view of the increasing frequency of mobile phone product upgrading and the large demand for production and manufacturing, the traditional detection method of cover glass relies on the human eye to judge various problems on the glass surface, which has great limitations, such as the human eye is not sensitive to small defects, and there is a risk of false detection and missing detection; The human eye cannot continuously and stably complete the high intensity repetitive detection work, which will cause fatigue, slow speed and low efficiency; Subjective judgment is affected by mood, thinking, light, etc., and has great instability and non-standard.

Human eye detection has been unable to meet the high-speed, accurate and real-time quality inspection requirements of modern enterprises, and the rising labor costs have brought pressure to the enterprise operation. At this time, the machine vision inspection equipment will be sent to use. Machine vision replaces the human eye, adopts intelligent image acquisition and image processing technology, and the inspection system uses visual processing algorithms to achieve accurate defect detection, intelligent classification and classification, which has become the standard configuration of the cover glass inspection industry. Specifically, in the past, the manual detection efficiency was 1000-1200 pieces per day, while the machine detection efficiency could reach 40000 to 45000 pieces per day.
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