Founded in 2006, Changchun Rongde Optics Co., Ltd.（ROUNDSS） is a national high-tech & national specialized, sophisticated, distinctive and innovative enterprise, located in Changchun — China’s well-known optical industry base. We integrate independent R&D, automated manufacturing and global sales of precision rotary encoders, linear scales, high-precision couplings and displacement sensors.



Our factory covers integrated facilities including standardized office buildings, dust-free constant-temperature assembly workshops, automatic SMT production lines, exclusive R&D labs, full-function QC testing centers and large finished goods warehouses. We implement standardized 5S on-site management and ISO9001 quality control system throughout all production procedures. Supported by professional process, quality, R&D and multilingual international technical teams, we own over 40 independent intellectual property patents, with self-developed automatic assembly equipment to guarantee consistent product quality and stable output. Core components such as signal processing chips and optical code discs are self-developed and manufactured in-house.



Our product portfolio includes more than 100 models across 20 series: incremental optical/magnetic encoders, single/multi-turn absolute encoders, magnetic ring encoders, linear grating scales, draw-wire displacement sensors, MPG handwheels, plus full ranges of diaphragm, jaw, locking flange couplings. We accept customized OEM solutions for special shaft sizes, high temperature & explosion-proof grades, with 18-month standard warranty for all finished products.



Our sensors are widely applied in CNC machine tools, servo robots, textile & printing machinery, construction machinery, wind power, new energy, and aerospace. Products are exported to over 60 countries including USA, Canada, Colombia, Argentina, India and Europe. We maintain stable distributor networks worldwide and attend global industrial exhibitions regularly, supplying one-stop precision motion feedback solutions for global OEM equipment manufacturers.



Roundss delivers strict quality control, reliable lead time and full-lifecycle technical support to partners worldwide. We keep upgrading high-precision, high-protection and miniaturized sensing products, striving to be a trusted core supplier of encoders for the global automation industry.