Location History:
- Hitachi, JA (1977)
- Hitachi, JP (1981 - 1991)
Company Filing History:
6 out of 42,517 
2 out of 14 Years Active: 1977-1991
Title: The Innovations of Tadashi Sakaue
Introduction
Tadashi Sakaue is a notable inventor based in Hitachi, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of 6 patents. His work primarily focuses on the development of advanced thyristors, which are crucial components in power electronics.
Latest Patents
One of Sakaue's latest patents is the "Gate turn-off thyristor of multi-emitter type." This invention features a gate turn-off (GTO) thyristor that consists of multiple unit GTO thyristors arranged in a strip-like configuration on the same semiconductor substrate. Each unit is constructed with an N emitter layer, P base layer, N base layer, and P emitter layer. Notably, the P base and N base layers are shared among all unit GTO thyristors, which are designed in a multi-ring configuration. The exposed area of the P emitter layer of a unit GTO thyristor located far from the gate signal input area is intentionally made smaller than that of a unit GTO thyristor positioned closer to the gate signal input area.
Another significant patent is the "Thyristor of overvoltage self-protection type." This invention allows for a thyristor to perform a turn-on operation without damage, even when subjected to overvoltage conditions. It features a P-base layer with a recess designed to generate an avalanche effect near the bottom of the recess when overvoltage is applied. Additionally, a portion of a P+ layer on the surface of the recess remains in contact with an N-emitter layer, enhancing its reliability.
Career Highlights
Tadashi Sakaue has worked with prominent companies such as Hitachi, Ltd. and Hitachi Haramachi Semiconductor, Ltd. His experience in these organizations has allowed him to refine his expertise in semiconductor technology and contribute to various innovative projects.
Collaborations
Throughout his career, Sakaue has collaborated with notable colleagues, including Shuroku Sakurada and Kazutoyo Narita. These partnerships have fostered a collaborative environment that has led to advancements in their respective fields.
Conclusion
Tadashi Sakaue's contributions to semiconductor technology through his innovative patents and collaborations highlight his importance in the industry. His work continues to influence the development of reliable and