事業案内 Our Business

Electronic Parts Business

国内初のマスクブランクス専業メーカー クリーンサアフェイス技術株式会社

本社工場

Mask blanks
Mask blanks are used in the process of producing photo masks, which are necessary for making complex electronic circuits used in flat-panel TV screens and semiconductors.

Clean Surface Technology (CST) was established in 1977 as Japan’s first manufacturer specializing in mask blanks. Since then, CST has been supplying mask blanks to major domestic and overseas photomask manufacturers for various applications, mainly in LCDs, semiconductors and OLED displays.
CST has accumulated world-class proprietary technologies in such areas as cleaning, film formation and resists through the evolution of its business over many years while manufacturing machinery and equipment in-house since its founding. This has allowed CST to create new value for its customers. CST has gained an excellent customer base that includes large corporations. In particular, it has secured a position as the dominant player in mask blanks for ultra-large LCDs and OLED displays, and has established a strong position within the industry.
CST will aim to become “the world’s No. 1 technology company” by following its management philosophy of “The customer’s excitement is our joy!” and will conduct its business with the intention of making a contribution to the world with technology.

  • Main plant

    Main plant

  • Esashi factory

    Esashi factory

  • Manufacturing equipment (film formation)

    Manufacturing equipment (film formation)

MM Nagata Coal Tech株式会社

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