Changchun Rongde Optics Co. Ltd is located in the modern city-Changchun which known as ,the optoelectronics industry base of China “. It is a high-technology enterprise concerned with R ” D manufacture and sales of Industrial encoders and high-precision couplings. In 2008, Rongde optics became the only encoder incubating member of the national project Jilin photonics industry incubator.brbrNow the company has over 150 employees> including 50 technicians. Cooperated with Changchun Institute of Optics and Fine Mechanics Chinese Academy of Science and Changchun University of science and technology, professional research institutes were built. In response to market demand Rongde Optics introduced advanced assembly technology abroad and launched a large number of new products each year. In 2010, the company obtained several technical patents in product technique innovation. Rongde Optics became the most powerful supplier of industrial encoder and coupling in china by the perfect design superb technology and sound after-sales service. Meanwhile, it is also one of domestic manufactures which produce encoders and couplings with the most complete types and the widest application. br