Company Filing History:
Years Active: 2004-2006
Title: Kenji Yagi: Innovator in Semiconductor Technology
Introduction
Kenji Yagi is a prominent inventor based in Okazaki, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of 2 patents. His work focuses on enhancing the efficiency and reliability of semiconductor devices.
Latest Patents
Yagi's latest patents include a transfer-molded power device and a method for manufacturing such devices. This semiconductor device features a semiconductor chip that generates heat during operation, paired with heat sinks for effective cooling. The design incorporates a mold resin that embeds both the chip and the heat sinks. The specifications ensure that the thickness of the chip and one of the heat sinks, which is joined to the chip using solder, satisfy the equation of t/t ≥ 5. Additionally, the thermal expansion coefficients of the heat sinks and mold resin are designed to meet the criteria of 0.5 ≤ α ≤ 1.5. The surface of the chip facing the solder has a roughness Ra that meets the requirement of Ra ≤ 500 nm. Furthermore, the solder used is a Sn-based solder, which helps to suppress the relaxation of compressive stress in the chip caused by solder creeping.
Another notable patent is the semiconductor switching element driving circuit. This circuit includes an overcurrent limiting feature that instantly drops the voltage of a gate terminal of an IGBT when the main IGBT current exceeds a predetermined level. It also has an overcurrent protection circuit that reduces the main IGBT current at different inclinations based on specific current levels.
Career Highlights
Kenji Yagi is currently employed at Denso Corporation, a leading company in the automotive technology sector. His work at Denso has allowed him to apply his innovative ideas in practical applications, contributing to advancements in semiconductor technology.
Collaborations
Throughout his career, Yagi has collaborated with notable colleagues, including Yutaka Fukuda and Ryoichi Okuda. These collaborations have fostered a creative environment that encourages innovation and the development of cutting-edge technologies.
Conclusion
Kenji Yagi's contributions to semiconductor technology through his patents and work at Denso Corporation highlight his role as a key innovator in the field. His inventions not only enhance device performance but also pave the way for future advancements in semiconductor applications.