Susumu Hirooka

Title: The Innovations of Susumu Hirooka

Introduction

Susumu Hirooka is a notable inventor based in Takasaki, Japan. He has made significant contributions to the field of ceramic materials, particularly in the development of semiconductive ceramics for varistors. With a total of four patents to his name, Hirooka's work has had a substantial impact on the electronics industry.

Latest Patents

Hirooka's latest patents include innovative ceramic materials with voltage-dependent nonlinear resistance. These materials are designed for use in varistors, enabling them to function effectively as capacitors as well. The primary component of these ceramic materials is SrTiO.sub.3, supplemented by various oxides such as Nb.sub.2 O.sub.5 and Ta.sub.2 O.sub.5, which enhance their semiconductive properties. Additionally, the inclusion of Na.sub.2 O improves the surge-proof capabilities of the varistors, while Al.sub.2 O.sub.3 enhances the temperature stability of the varistor voltages. These advancements allow for varistors that maintain consistent performance across a wide temperature range, from -40°C to +120°C.

Career Highlights

Hirooka is currently employed at Taiyo Yuden Co., Ltd., where he continues to innovate in the field of ceramic materials. His work has been instrumental in advancing the technology used in electronic components, particularly in enhancing the reliability and efficiency of varistors.

Collaborations

Hirooka has collaborated with notable colleagues such as Masaru Masuyama and Nobutatsu Yamaoka. Their combined expertise has contributed to the successful development of advanced ceramic materials.

Conclusion

Susumu Hirooka's contributions to the field of ceramic materials and varistors exemplify the importance of innovation in technology. His patents reflect a commitment to enhancing electronic components, ensuring their reliability and efficiency in various applications.