Tokyo Seimitsu (ACCRETECH)
A precision equipment maker sold under the ACCRETECH brand, supplying wafer probers, dicing machines and grinders for semiconductors, plus measuring instruments for manufacturing.
東京精密・Equipment・Last updated: October 15, 2026
Overview
Tokyo Seimitsu was founded in 1949 and is headquartered in Hachioji, Tokyo, with a major production site in Tsuchiura, Ibaraki.
Wafer probers position each die under a probe card so that a tester can check it before dicing. Probers are therefore used together with testers such as those from Advantest.
Business: Wafer probers, dicing and grinding machines, metrology
Why it matters
Probers and dicing put Tokyo Seimitsu in the same back-end steps as Advantest and DISCO, completing a largely Japanese line-up for wafer test and singulation.
Main products
- •Wafer probing machines
- •Dicing machines
- •Polish grinders for wafer thinning
- •Metrology instruments (surface texture, roundness, coordinate measuring)
Sites in Japan
Head officeHeadquarters
Hachioji, Tokyo
Tsuchiura plantPlant
Tsuchiura, Ibaraki
Other Japanese companies: Equipment
- Tokyo Electron (TEL)JapanCoat/develop, etch and deposition equipment
- SCREEN HoldingsJapanWafer cleaning, coat/develop and inspection equipment
- AdvantestJapanAutomated test equipment (ATE) for SoC and memory
- DISCOJapanDicing, grinding and polishing equipment
- LasertecJapanEUV mask and mask blank inspection
- Kokusai ElectricJapanBatch deposition, diffusion and ALD equipment
- EbaraJapanCMP systems, dry vacuum pumps and exhaust treatment