Accelerating construction of the world's first diamond semiconductor factory!
Established a new system with three advisors: Mr. Kamigama, Mr. Umehara, and Mr. Maekawa.
Okuma Diamond Device Co., Ltd. (Headquarters: Kita-ku, Sapporo, Hokkaido, Representative Director: Naohisa Hoshikawa, hereinafter referred to as the "Company") is proceeding with the construction of the world's first diamond semiconductor factory in Okuma Town, Fukushima Prefecture, with the aim of starting operations in 2026. I am. We have recently welcomed the following three people who have been active at the forefront of the industry have built a new structure to further expand our business and strengthen our management foundation
- Mr. Takehiro Kamigama (Former President and Representative Director of TDK Corporation)
- Mr. Toshishi Umehara (Formerly Representative Director, Senior Managing Executive Officer, CTO, Nitto Denko Corporation)
- Mr. Tatsuyuki Maekawa (Former Managing Director of Toshiba Power Radiation Techno Service Co., Ltd.)
A new era opened by diamond semiconductors
Diamond semiconductors are attracting attention for their heat resistance, high output performance, and durability in harsh environments. Using this technology, we aim to apply it in a wide range of fields, starting with the decommissioning project at the Fukushima Daiichi Nuclear Power Plant, as well as space development and next-generation high-speed communications (6G) infrastructure.
With this appointment as an advisor, we will accelerate our business while receiving multifaceted support from on-site production technology to management strategy, and aim to expand our share in the domestic and overseas markets.
Career history and expected contributions of advisors
① Mr. Takehiro Kamigama: Promoting social implementation of diamond semiconductors

Mr. Kamigama is a manager with extensive industry knowledge, having led TDK Corporation's magnetic head business to the top market share in the world, and having directed M&A of semiconductor-related companies. At our company, you will be responsible for maintaining production lines at our diamond semiconductor factory and promoting global business development.
Biography
1981 Joined TDK Corporation
2006 Representative Director and President of the company
2017 Outside Director of SoftBank Corp. (current position)
② Mr. Toshishi Umehara: Strengthen intellectual property strategy

Mr. Umehara leads the polarizing film business for smartphone displays and has a track record of expanding global market share through intellectual property protection and technology development. We hope that this will make a significant contribution to strengthening our strategy in the intellectual property field.
Biography
1984 Joined Nitto Denko Corporation
2019 Representative Director, Senior Managing Executive Officer, CTO
③ Mr. Tatsuyuki Maekawa: Supporting nuclear power-related technology applications

Mr. Maekawa led the development of radiation measurement and nuclear instrumentation technology at Toshiba Group, and was also instrumental in bringing the Fukushima Daiichi nuclear power plant accident under control. In developing products for our company's decommissioning business, we expect extensive support in terms of measurement technology and quality control.
Biography
1984 Joined Japan Atomic Energy Corporation
2015 Managing Director, Toshiba Electric Power Radiation Techno Service Co., Ltd.
Okuma Diamond Device Co., Ltd. Overview
- Company name : Okuma Diamond Device Co., Ltd.
- Representative : Naohisa Hoshikawa, Representative Director
- Established : March 1, 2022
- Address : Hokkaido University Business Spring, Kita 21-jo Nishi 12-chome, Kita-ku, Sapporo, Hokkaido
- URL : https://ookuma-dd.com
■Press release source - Okuma Diamond Device Co., Ltd.
https://companydata.tsujigawa.com/company/2430001086118/
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