Site Report

Tokyo Seimitsu introduced an in-house company system in April 2002 and operates three companies: The Semiconductor Company, Metrology Company, and Administration Company. The Hachioji Plant is the home of the Semiconductor Company, which develops and manufac-tures semiconductor manufacturing equipment, and the Administration Company, which is in charge of administration departments.
The plant was established in 1963 in the Kita-Hachioji Industrial Park (Ishikawa Industrial Park) located in the northeastern part of Hachioji City, Tokyo. The production base for semiconductor anufacturing equipment was gradually moved from Mitaka, where the company was founded, to Hachioji. After the completion of the first plant, the symbol of the Hachioji Plant, the tallest building in the industrial park, known as the ACCT Tower, was completed. As of 2023, there were five plants within the main plant as a result of increasing our production capacity.
In the Semiconductor Manufacturing Equipment Business, we produce equipment for manufacturing semiconductors. We mainly manufacture back-end processing equipment, which are used in the latter half of the semiconductor manufacturing process, and have expanded into the conventional wafer manufacturing field as well as the testing, CMPs (chemical mechanical planarizers), and flaking fields, and are always working to develop the latest technologies.
The Hachioji Plant utilizes cellular manufacturing* for production in order to provide equipment tailored to each customer's needs. We also have an application center within the plant for training and customer problem-solving, and have a service structure in place.
At the plant, we are actively engaged in the installation of solar panels, water reuse, and recycling of renewable resources, aiming to create an environmentally-friendly plant.

he Tsuchiura Plant is the home of the Metrology Company, which develops and manufactures precision measuring instruments, and Tosei Systems, a Group company that develops system software for those products.
The Tsuchiura Plant was established in 1969 in Tsuchiura City, Ibaraki. As of 2023, four plants comprised the main plant.
In the Precision Measuring Instrument Business, we provide high-precision measuring instruments used in measuring rooms and machining tooling lines in various industries around the world, including the automotive, heavy duty equipment, and aircraft industries, for which we have received high praise from our customers. We are constantly developing products to meet the latest needs, such as improving resistance to environmental factors, creating smaller footprints, and automating operations.
The Company is characterized by the fact that it completes all processes, from development to manufacturing of a single product, at the same site, and this is also the case at this Tsuchiura Plant. There is also a Metrology Center within the plant for training and customer problem-solving, and have a service structure in place.
We contribute to the development of manufacturing that requires advanced measurement technology, such as automobile, aircraft, medical, and energy industries, which are indispensable for our lives.