Location History:
- Kanuma, JP (2002 - 2008)
- Tochigi, JP (2011 - 2022)
Company Filing History:
6 out of 186 
5 out of 122 
5 out of 684 
Years Active: 2002-2025
Title: **Innovative Contributions of Hiroyuki Kumakura**
Introduction
Hiroyuki Kumakura is a distinguished inventor based in Kanuma, Japan, known for his significant contributions to the field of smart card technologies and electrical inspection tools. With an impressive portfolio of 15 patents, his work has enhanced the reliability and efficiency of electronic components used in various applications.
Latest Patents
Among Kumakura's latest innovations is a patented method for manufacturing a smart card that achieves excellent connection reliability and bending resistance. This method incorporates a conductive particle-containing hot-melt adhesive sheet that features solder particles from a non-eutectic alloy. The sheet is composed of a binder made from crystalline polyamide, which possesses a carboxyl group that significantly improves the solder wettability of the non-eutectic alloy. This advancement leads to enhanced connection reliability through a flux effect attributed to the carboxyl group, while simultaneously maintaining the elastic modulus of the adhesive layer to provide excellent bending resistance.
Another noteworthy patent is an electrical characteristics inspection tool designed to inspect electrical properties even in the presence of oxide films that can form on pads or bumps at finely pitched intervals. This innovative tool uses a flexible sheet, a through electrode with a recessed design, and a conductive elastomer that effectively contacts the inspection pads or bumps, enabling accurate inspections by breaking through oxide films during the process.
Career Highlights
Kumakura has had a notable career working for prominent organizations including Sony Chemicals Corporation and Sony Chemical & Information Device Corporation. His experience in these companies has been instrumental in his development as an inventor, allowing him to leverage cutting-edge technologies while contributing to innovative solutions.
Collaborations
Throughout his career, Hiroyuki Kumakura has collaborated with talented professionals, including Satoshi Yamamoto and Shiyuki Kanisawa. Their collective efforts have helped to push the boundaries of technology in the fields of smart card manufacturing and electrical inspection tools, demonstrating the power of teamwork in achieving remarkable innovations.
Conclusion
Hiroyuki Kumakura's inventive spirit and dedication to advancing technology are evident through his impressive patent portfolio and collaborative efforts. His innovations continue to play a crucial role in enhancing the functionality and reliability of electronic devices, paving the way for future developments in the industry.