Shandong Yu Ying Optical Instrument Co., Ltd. is currently one of the world's largest supplier of Fresnel lens. Company from 1968 to set up so far has focused on research and development and production of Fresnel lens. After nearly half a century of efforts, annual production all kings of Fresnel lens of tens of millions of tablets, thousands of domestic and foreign customers provides different focal lengths, different tooth pitch, different uses of high-quality Fresnel lens.