Accretech

Accretech is the corporate brand used by Tokyo Seimitsu Co., Ltd., a Japanese manufacturer whose business is built around two complementary areas: semiconductor manufacturing equipment and precision measuring instruments. The company traces its origins to Tokyo Seimitsu Kōgu Co., Ltd., established in 1949 as a precision-tool maker. Its early measurement expertise developed into a broader instrumentation business, while work on automated equipment for electronic components and semiconductors led to its expansion into semiconductor manufacturing machinery. The company’s current offering serves industrial customers involved in semiconductor production and precision manufacturing. On the semiconductor side, it describes equipment for test, assembly, and wafer-manufacturing fields, and says it helps customers build production systems suited to their needs. Its measurement business ranges from general-purpose measuring instruments to products intended to meet varied in-line measurement requirements. The company presents measurement technology as a distinctive capability that it applies across both businesses, supporting more precise processing and inspection. Accretech operates from Japan and maintains locations in major regions around the world. Its official company material describes both divisions as serving global industry with a focus on world-standard quality. The company’s stated approach emphasizes long-term growth through mutually beneficial relationships with customers, suppliers, shareholders and investors, employees, and other stakeholders. Its stated purpose connects measurement with creating the future and semiconductors with building the future. The name Accretech is presented alongside Tokyo Seimitsu in the company’s official materials. Tokyo Seimitsu Co., Ltd. remains the corporate entity identified in the company history, while Accretech is its corporate brand. The available material confirms a long operating history and a current two-business structure, but does not establish a specific headquarters address, founder, or present-day executive names.

Tokyo Seimitsu’s history began in March 1949, when Tokyo Seimitsu Kōgu Co., Ltd. was established as a precision-tool manufacturer. Its early work in precision manufacturing provided the foundation for a growing focus on measurement. In 1951, the company began producing and selling measuring instruments based on mechanical gauges. The company’s official history identifies the 1952 industrialization of a high-pressure-flow air micrometer as a significant early achievement. In 1957, it industrialized a differential-transformer-type electric micrometer, while also developing products that extended its range beyond its initial tools business. In 1958, Tokyo Seimitsu developed an automatic thickness-sorting machine for germanium pellets. The company describes this work as an early step into automated precision equipment for electronics and semiconductors. It later changed its name from Tokyo Seimitsu Kōgu Co., Ltd. to Tokyo Seimitsu Co., Ltd. in 1962, reflecting an ambition to pursue a wider field than tools alone. That year, it was listed on the Second Section of the Tokyo Stock Exchange, according to its official chronology. The 1960s established the company’s presence in semiconductor manufacturing equipment alongside its measurement business. In 1963, it developed a wafer slicing machine, and in 1964 it developed a probing machine. The company history describes the latter as Japan’s first probing machine and says it was delivered to semiconductor manufacturers throughout the country at the time. In 1969, Tokyo Seimitsu developed a three-dimensional coordinate measuring machine. In 1970, it developed a wafer dicing machine, applying its precision engineering capabilities to semiconductor processing. The company continued developing measurement products, including the RONDCOM 5A roundness and cylindrical-form measuring instrument, introduced in 1979. Its international and organizational development also progressed. It established subsidiaries in Europe and the United States in 1989. In 1992, it acquired U.S. company Silicon Technology (STC), according to the company history. The official chronology records further overseas offices, subsidiaries, technical facilities, and business relationships through the 1990s, including activity in Korea, Malaysia, China, Taiwan, Singapore, and Israel. In 1986, the company moved from the Tokyo Stock Exchange Second Section to the First Section. In 2001, Tokyo Seimitsu established ACCRETECH as its corporate brand, describing the change as part of its goal to become a global company that grows together with its stakeholders. The company has since continued to develop products in both of its core businesses. Its official overview highlights Opt-scope Rex, a 3D white-light interferometry optical measuring instrument developed in 2021, and describes the product as enabling sub-nanometer-level surface-roughness measurement. In 2023, the company completed its Hanno factory, expanding semiconductor-equipment production capacity. In 2025, its group company Tokyo Seimitsu Engineering completed a Nagoya factory; company material says the site also includes the Chubu Measurement Center, a base for technical support and solutions in precision measurement. Today, the company presents semiconductor manufacturing equipment and precision measuring instruments as its two principal businesses. It describes the combination of measurement expertise and semiconductor equipment as a source of synergy: measurement technology is applied to manufacturing equipment to support precise processing and inspection. Its stated purpose is to measure the future through measurement and create the future through semiconductors. The available official material establishes the company’s founding, brand adoption, core business areas, and selected product and facility milestones, but does not identify a founder or provide current executive names.

• 2025

  Tokyo Seimitsu Engineering Nagoya factory completed

• 2023

  Hanno factory completed

• 2021

  Opt-scope Rex developed

• 2001

  ACCRETECH corporate brand established

• 1992

  U.S. company Silicon Technology acquired

• 1989

  European and U.S. subsidiaries established

• 1986

  Moved to the Tokyo Stock Exchange First Section

• 1979

  RONDCOM 5A measuring instrument developed

• 1970

  Wafer dicing machine developed

• 1969

  Three-dimensional coordinate measuring machine developed

• 1964

  Probing machine developed

• 1963

  Wafer slicing machine developed

• 1962

  Company renamed and listed on the Tokyo Stock Exchange Second Section

• 1958

  Automatic germanium-pellet thickness sorter developed

• 1952

  High-pressure-flow air micrometer industrialized

• 1949

  Tokyo Seimitsu Kōgu Co., Ltd. established

A Japanese industrial technology company that combines precision measurement expertise with semiconductor manufacturing equipment, applying measurement technology across both business areas.

• Semiconductor manufacturing equipment

  Equipment for test, assembly, and wafer-manufacturing fields.

• Precision measuring instruments

  Instruments ranging from general-purpose measuring equipment to products for in-line measurement needs.

• Opt-scope Rex

  A 3D white-light interferometry optical measuring instrument developed in 2021; the company says it enables sub-nanometer-level surface-roughness measurement.

• 2001

  Adopted ACCRETECH as corporate brandOther

1. 1トップ | ACCRETECH - 東京精密accretech.com
2. 2沿革 | 東京精密について | ACCRETECH - 東京精密accretech.com
3. 3東京精密について | ACCRETECH - 東京精密accretech.com
4. 4ひと目でわかる東京精密 | ACCRETECH - 東京精密accretech.com