Shigeya Naritsuka

Title: Innovations by Shigeya Naritsuka: A Pioneer in Semiconductor Technology

Introduction

Shigeya Naritsuka is a notable inventor based in Yokohama, Japan, recognized for his significant contributions to semiconductor technology. With a total of four patents to his name, Naritsuka has made strides in developing advanced light emitting devices that play a crucial role in modern electronics.

Latest Patents

One of Naritsuka's recent patents pertains to a semiconductor light emitting device. This device comprises a semiconductor substrate and a double hetero structure composed of an InGaAlP active layer sandwiched between lower and upper clad layers. Notably, it features a first electrode on the surface of the double hetero structure and a second electrode on the back surface of the substrate. A current diffusion layer made of GaAlAs is interposed between the hetero structure and the first electrode, specifically designed with a thickness of 5 to 30 microns and a carrier concentration ranging from 5 x 10^17 cm^-3 to 5 x 10^18 cm^-3.

Another patented invention focuses on a light emitting diode that includes a compound semiconductor substrate of a first conductivity type. An InGaAlP layer is formed on this substrate, featuring a light emitting region. Additionally, a GaAlAs layer of a second conductivity type is formed on the InGaAlP layer, which contains a larger band gap. The design allows the light emitting diode to emit light from the surface without obstruction from the electrode, while the GaAlAs layer facilitates the spreading of current across the light emitting region.

Career Highlights

Shigeya Naritsuka is employed by Toshiba Corporation, a leading company in technology and electronics. His work within Toshiba has allowed him to be at the forefront of innovations in semiconductor devices, leading to the development of cutting-edge technologies that enhance performance and efficiency in electronic applications.

Collaborations

Throughout his career, Naritsuka has collaborated with esteemed coworkers, including Masayuki Ishikawa and Yoshihiro Kokubun. Together, they have contributed to advancements in semiconductor technology, exemplifying teamwork and innovation in their research endeavors.

Conclusion

Shigeya Naritsuka's work in semiconductor light emitting devices is instrumental in the evolution of modern electronics. His patents reflect a commitment to innovation and a profound understanding of semiconductor physics. As technology continues to advance, Naritsuka's contributions will undoubtedly leave a lasting impact on the field.