Location History:
- Shiga-ken, JP (2001 - 2002)
- Gamo-gun, JP (2002)
Company Filing History:
Years Active: 2001-2002
Title: Noriyuki Yamamoto: Innovator in Semiconductor Ceramics
Introduction
Noriyuki Yamamoto is a prominent inventor based in Shiga-ken, Japan. He has made significant contributions to the field of semiconductor ceramics, holding a total of 3 patents. His work focuses on developing advanced materials that enhance the performance of electronic devices.
Latest Patents
Yamamoto's latest patents include a semiconductor ceramic and device using the same. This innovative semiconductor ceramic is composed of barium titanate, lead titanate, strontium titanate, and calcium titanate as primary components. It includes samarium oxide as a semiconductor-forming agent, with crystalline particles averaging about 7 to 12 µm in diameter. The ceramic exhibits a resistivity at room temperature not greater than 3.5 Ωcm, a withstand voltage of at least 50 V/mm, and a resistance-temperature coefficient α of not less than 9%/°C, demonstrating less variability in resistance.
Another notable patent is for a composite material for positive temperature coefficient (PTC) thermistors. This ceramic has a resistivity at room temperature of 5 Ω·cm or less, a static withstanding voltage of 60 V/mm or more, and a temperature resistance coefficient of 9.0 %/°C. The composition includes principal components of barium titanate, lead titanate, strontium titanate, and calcium titanate, along with specific amounts of samarium, manganese, and silicon. The manufacturing process involves heat treatment in an oxidative atmosphere after firing in a reducing or neutral atmosphere.
Career Highlights
Yamamoto is currently employed at Murata Manufacturing Co., Ltd., where he continues to innovate in the field of semiconductor materials. His work has been instrumental in advancing the technology used in various electronic applications.
Collaborations
Yamamoto collaborates with notable colleagues, including Yasuhiro Nabika and Toshiharu Hirota, contributing to a dynamic research environment that fosters innovation.
Conclusion
Noriyuki Yamamoto's contributions to semiconductor ceramics have positioned him as a key figure in the field. His innovative patents reflect a commitment to enhancing electronic device performance through advanced materials.