The factory when established Established as a synthetic gemstone manufacturing company Head office: Kobiki-cho, Chuo-ku, Tokyo
Verneuil sapphire and ruby factory: Kosugaya, Totsuka-ku, Yokohama (Current head office)
Expanded business into production and distribution of synthetic gemstone, oxygen and hydrogen
Inside of the factory around 1965 Head office relocated to Ginza, Chuo-ku, Tokyo
Succeeded in development of star ruby for jewelry and ruby for laser
Started production of sapphire watch windows
In 1973 RUBYCA Industry Co.,Ltd. established as a crystal boule manufacturing affiliate in Uozu, Toyama (Joint company with Nippon Carbide Industries Co.,Inc.)
Entered the optical communication area by starting rutile prism sales
→Product information: Rutile prism
Started sales of single crystal substrates for superconductive thin films growth
In 1992 Started sales of optical isolator for optical fiber communication system
Started sales of the world’s smallest polarization-independent optical isolator
Started sales of STEP substrate
Head office relocated to Kyobashi, Chuo-ku, Tokyo
Started sales of sapphire substrates for blue LEDs
→Product information: Sapphire substrate
Won the JACG Industrial Achievement Award for “Development of crystal growth and processing technology for oxide substrate for superconducting thin film”
Acquired ISO9001 certification from DNV.
Won the Kanagawa Industrial and Technological Development Award for “Development of oxide single crystal STEP substrate”
→Product information: STEP substrate
In 1999 ・Head office relocated to Kosugaya, Sakae-ku, Yokohama
・Sakudaira plant operation started
・Won the Kanagawa Industrial and Technological Development Award for “Development of small optical monitor module”
・Tochigi factory operation started
・Acquired ISO9001:2000
・Sakudaira plant closed and merged with the Head office
・Tochigi factory renamed to Tochigi plant
Started sales of optical fiber sensor
Won the Kanagawa Industrial and Technological Development Incentive Award for “Development of optical fiber sensor using the Faraday effect”
→Product information: Optical fiber sensor
In 2008 ・Won the Kanagawa Industrial and Technological Development Incentive Award for “Development of 1mm-band heat releasing optical fiber isolator”
→Product information: Optical isolator for fiber laser
・Won The Excellent Member Company of Industrial Division of The Yokohama Chamber of Commerce and Industry Award
Acquired EcoAction 21 certification from the Ministry of the Environment
Won The Glittering Industrial Technology in the Nine Prefectural and City Governments Award for “Application of optical wavelength multiplexing sensing system into the environmental field”
Won the Kanagawa Prefecture Excellent Factory Award
Mr. Katsuyuki Yonezawa, President and CEO of our company was awarded the Order of the Rising Sun, Silver Rays.
Sapphire mirror adopted in KAGRA, a large-scale cryogenic gravitational-wave telescope
