Japan Corporation Dragon since 1950, the venture has to satisfy customers, to provide customers with high quality, high reliability, high-performance lenses for thrust, diligence, excellence in technology research and development, a comprehensive professional manufacturers of optical technologies as the capital.2006 annual listing on the Tokyo Stock Exchange first.

1997, Dragon company in Foshan City, Guangdong Province, set up the first overseas production base--Dragon optical (Foshan) co., Ltd., to several millions of sophisticated manufacturing optical products in the world and was recognized as high and new technology enterprises in China.

1997 Japan Dragon company also established a sales office in Shanghai, China. in October 2005, for better sales in the Chinese market, formally set up a wholly-owned subsidiary of Shanghai-Dragon optical (Shanghai) co., Ltd., an important step forward in the Chinese market.2009 year Dragon optical (Shanghai) co., Ltd. in Beijing, the firm was established in Chengdu, Guangzhou Office was opened again in 2010, 2011 and successively in Shenyang, Xian and Wuhan has opened three firms formed has sales offices in the 7 administrative areas are patterns, increasing sales, provide more timely, more services. 

tenglong company has a full suite of technologies from research and development to production and equipment. the company not only develop and sell TAMRON brand DSLR camera lens, CCTV (closed circuit monitoring system) with lens, as well as in senior high pixel digital camera lens digital camera lenses and civilian, cell phone camera, and other areas, with a number of top international and the world's leading appliance manufacturers have a long and stable OEM business of the good relations of cooperation. senior high pixel digital camera and digital video camera lens yielding global share of about 25%. the Dragon will continue to provide sophisticated optical solutions for all areas of industry, enterprises should have contributed to social development.