Location History:
- Kokubunji-shi, Tokyo, JP (1990)
- Tokyo, JP (1992)
- Kokubunji, JP (1978 - 2009)
Company Filing History:
25 out of 42,496 
3 out of 217 
1 out of 336 Years Active: 1978-2009
Title: The Innovations of Yoichi Tamaki
Introduction
Yoichi Tamaki, based in Kokubunji, Japan, is a prolific inventor with an impressive portfolio of 32 patents. His work primarily focuses on semiconductor devices, demonstrating a commitment to advancing technology in this crucial field.
Latest Patents
Among his latest patents, Tamaki has developed a semiconductor device featuring a configuration of multiple npn-type bipolar transistors arranged strategically on a semiconductor layer over an insulation layer. This design allows the unit bipolar transistors to be connected in parallel, facilitating the creation of desired bipolar transistors. Additionally, a deep trench isolation surrounds these transistors, ensuring thermal stability for those requiring it.
Tamaki's innovation continues with another significant patent related to a polycrystalline silicon conducting structure, particularly a resistor. This invention aims to control the resistance value with minimal variability and reduced temperature dependency, using a two-layer structure. The first layer is characterized by large crystal grain size, exhibiting a positive temperature coefficient of resistance, while the second showcases small grain size with a negative coefficient, or vice versa. This dual-layer approach improves the performance of semiconductor devices significantly.
Career Highlights
Yoichi Tamaki has worked with renowned companies, including Hitachi, Ltd. His contributions to the field of semiconductor technology throughout his career have established him as a leader in innovations.
Collaborations
Throughout his career, Tamaki has collaborated with notable professionals such as Takeo Shiba and Akihisa Uchida. These partnerships have contributed to the development of advanced technologies and further enriched the semiconductor landscape.
Conclusion
In conclusion, Yoichi Tamaki's extensive patent portfolio and collaborative efforts underscore his vital role in the field of semiconductor innovations. His inventions continue to push the boundaries of technology, promising advancements that can significantly impact the industry.