Tsuyoshi Onuma

Title: The Innovations of Tsuyoshi Onuma

Introduction

Tsuyoshi Onuma is a notable inventor based in Chikusei, Japan. He has made significant contributions to the field of materials science, particularly in the development of electrolytic copper foil. His work focuses on enhancing the electrical conductivity of copper foil, which is crucial for various electronic applications.

Latest Patents

Onuma holds a patent for an electrolytic copper foil and the method for producing it. This innovative foil boasts higher electrical conductivity and is characterized by a carbon content of 5 ppm or less, a sulfur content of 3 ppm or less, an oxygen content of 5 ppm or less, and a nitrogen content of 0.5 ppm or less. The total content of carbon, sulfur, oxygen, nitrogen, and hydrogen is maintained at 15 ppm or less. Additionally, the foil has a grain structure that changes from 8.0 to 12.0/μm to 0.6 to 1.0/μm when heated at 150° C for one hour. The production method involves cleaning a copper raw material, dissolving it to create an electrolytic solution with a total organic carbon of 10 ppm or less, and electrolyzing this solution to obtain the final product.

Career Highlights

Tsuyoshi Onuma is currently employed at Nippon Denkai, Ltd., where he continues to innovate in the field of materials. His work has not only advanced the technology behind electrolytic copper foil but has also contributed to the broader field of electronics.

Collaborations

Onuma collaborates with esteemed colleagues such as Toshio Kawasaki and Yasuhiro Endo. Their combined expertise fosters a productive environment for innovation and development.

Conclusion

Tsuyoshi Onuma's contributions to the field of materials science, particularly through his patented electrolytic copper foil, highlight his role as a significant inventor. His work continues to influence advancements in electronic materials, showcasing the importance of innovation in technology.