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Semiconductor History | Toppan Koishikawa — A Printing Plant Learns Transistor Masks
· 1960
Personal memoryBy kevin · · updated · Report an issue
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Semiconductor History | Toppan Koishikawa — A Printing Plant Learns Transistor Masks
kevin
1960
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In 1960, Toppan established a technology research facility at its Koishikawa Plant and began experimental production of precision parts, including masks for mesa transistors. Printing plate skills—etching, plating, photography, and exact repetition—were being redirected toward the young semiconductor industry.
The transition was not a single clean invention. Toppan’s electronics history dates prototype work on mesa-transistor masks to 1959, the Koishikawa research and experimental-production organization to 1960, and a silicon-transistor photomask prototype to 1961. Together they show a printing company learning a new industrial language one process at a time.
The good side was specialization. As Japan’s device makers expanded, an outside mask supplier could concentrate on pattern fidelity, materials, and clean production while customers focused on transistor and integrated-circuit design. That division of labor helped turn semiconductor manufacturing from a collection of vertically integrated laboratories into a supply chain.
The bad side was that the specialist inherited one of lithography’s hardest bottlenecks. Every shrink made defects less tolerable and mask-making equipment more expensive. Global scale became necessary: Toppan later expanded production overseas, acquired DuPont Photomasks, and eventually carved the photomask operation into a separate company, now called Tekscend Photomask.
That corporate evolution is both success and warning. The business survived because its printing ancestry created a durable technical advantage; it also had to become more capital-intensive, international, and organizationally separate from the diversified printer that created it.
There was another trade-off: specialization let many chipmakers share one supplier’s learning, but it concentrated risk. A disruption or technical shortfall at a merchant mask house could reach several customers at once, turning an efficient division of labor into a supply-chain choke point.
The curved Koishikawa building in this 2006 photograph stands on the continuing Toppan site and houses the Printing Museum, but it is not the 1960 plant structure. The pin marks the place lineage where the research facility was organized, not a preserved clean room.
Sources: [TOPPAN Holdings corporate history](https://www.holdings.toppan.com/en/about-us/history.html); [TOPPAN Electronics business history](https://www.toppan.com/ja/electronics/history/); [Toppan Annual Report 2013](https://asia.cdn.euroland.com/arinhtml/JP-TPX/2013/AR_ENG_2013/DownloadFile/AR_ENG_2013_o.pdf); [Tekscend Photomask corporate history](https://www.photomask.com/en/about/overview/); [Semiconductor History Museum of Japan equipment history](https://www.shmj.or.jp/english/equipment_material/em60s.html).
Photo: Lombroso, public domain, via Wikimedia Commons.
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