As an important technical crystal,Sapphire crystal is widely used in various fields such as infrared window materials, substrates in microelectronics, laser substrates, optical components, and other applications.
In March 2015, a customer inquired whether our screen printer could print a layer of resistance paste on the circular surface of sapphire crystals, with a alignment accuracy of ± 0.01mm.This is a very easy thing to achieve for our screen printer. So we proposed that the customer provide samples and conduct face-to-face communication.
After the customer provided the samples, we found a problem: the sapphire crystal is transparent and colorless, and it is difficult to ensure the consistency of all product printing positions during mass production solely by mechanical alignment. SO we organized our company's technical engineers to discuss this critical issue and conducted multiple demonstrations and tests on our proposed solution through our thick film printing laboratory.
Three days later, we proposed two solutions to the customer: first，we will apply the CCD visual alignment system to achieve the goal of automatic alignment and precision printing. Second，Due to the lack of clear reference points in sapphire crystals, it is difficult for CCD to accurately identify and locate them, so we need to use a special MARK point recognition and positioning method.
After internal evaluation, the customer unanimously approved our solution. Two months later, the equipment was delivered and successfully passed customer testing and acceptance.
