“Historical technology from Yamanashi, Japan to the world”
The history of quartz processing in Yamanashi is old, during AD 250 to 7th century of Kofun period people mined rock quartz and processed into accessories, as excavated at Sonekyuryo Kofun site. Since that era, the local quartz industries have developed mainly in jewelry field, and in 1930’s industrial use of quartz have gotten prosperous. KOIKE was established in 1946, as a manufacturer of quartz resonator, used for transceiver, etc. at that time. Today KOIKE mainly manufacturs “SAW wafer”, substrate of electrical device mounted in multifunction terminal like smartphone, and important device material to sort out necessary frequency from radio waves in air. All the manufacturing process from crystal growing to final product is integrated inhouse, and KOIKE, as the international SAW wafer supplier, owns our established customer base of worldwide major device makers. KOIKE always put Quality first, and will keep stable supply, and improve our production technology and quality control, based on the historical quartz processing technology in our hometown of Yamanashi, to fulfill the demand of higher precision and quality in this accelerating information technology market.