Quality

Since obtaining ISO 9001* certification at the Hachioji and Tsuchiura plants in 1994, we have established the Tokyo Seimitsu Quality Management System (QMS) and have been promoting quality improvement activities through the PDCA cycle based on quality policy and quality targets. In fiscal 2024, a certification body conducted certification inspections for surveillance audits, including on the Hanno Plant that was completed in July 2023. In addition, during fiscal 2025, we underwent an expanded audit aimed at integrating the quality management system for the charging and discharging test system business, which we acquired in October 2023, and both audits were completed without a hitch.

The Quality Management Committee consists of 10 members: One Quality Officer, three officers in charge of business, three quality control managers, and three Sustainability Department members. The Quality Management Committee meets twice a year to review the performance, effectiveness, and appropriateness of the Quality Management System. The Quality Officer reports to the Board of Directors and receives instructions and supervision. In fiscal 2025, there were no quality management issues that required corrective actions to be taken.

The internal audit team conducts Internal Quality Audits twice a year at the Company. Certified auditors conduct audits in accordance with the quality manual* under the direction of the Quality Control Managers of the Semiconductor Company and Metrology Company, who report the audit results and the effectiveness of the Quality Management System to the Quality Management Committee. During the internal quality audits performed in fiscal 2025, the auditors did not indicate that corrective actions needed to be taken.

* The percentage of responses with a score of 3 or higher (positive ratings) out of all responses on a 5-point scale

To incorporate customer feedback into the improvement and enhancement of our products and services, we conduct customer satisfaction surveys to ascertain customer satisfaction and strive to strengthen it. The satisfactory rate in the fiscal 2025 survey was 93.2%, down from the previous year. We take this result seriously. Going forward, the quality assurance, sales, service, and technology divisions will all work together to identify the cause and take corrective action.

The Tokyo Seimitsu Engineering Standards (TES), which are our internal regulations, stipulate quality-related rules, such as certification qualification rules, measuring instrument inspection and calibration standard, and instruction manual creation standard, in addition to production activity-related rules that apply to development, design, manufacturing, production control, quality control, service, and environmental management.

The TES are reviewed once a year and may be established, revised, or abolished as necessary. In each department of the plants, members of the Quality Subcommittee play a pivotal role in providing training to ensure that revised and abolished TES are known throughout the department. The General Affairs Dept. keeps and manages the records of this training.

Suppliers who supply many of the parts and components required for our products cooperate in the quality audits that we conduct using our ISO 9001-compliant checklists. In fiscal 2025, supplier quality audits were conducted at 19 companies (cumulative total of 258 companies). There were no follow-up audits conducted as there were no cases of non-compliance with our quality control standards and/or quality requirements.

* Only suppliers who have agreed to check the quality assurance system and implementation status of quality assurance activities

The Quality Assurance Dept. of Semiconductor Company creates a “regulatory compliance map by product” in collaboration with the individual technical groups. This list is used to manage information about the laws and regulations applicable to each product and whether the products comply with those laws and regulations. We have a structure in place that allows us to share regulatory information on a company-wide basis and reflect such information quickly on the products we ship.