Location History:
- Shiki, JP (1990 - 1992)
- Kawagoe, JP (1993 - 2005)
- Niiza, JP (2005 - 2008)
Company Filing History:
Years Active: 1990-2008
Title: **The Innovative Journey of Koji Ohtsuka**
Introduction
Koji Ohtsuka, based in Kawagoe, Japan, is a prominent inventor known for his significant contributions to the field of semiconductor technology. With a remarkable portfolio of 21 patents, Ohtsuka has been instrumental in developing advanced light-emitting devices that have numerous applications in the electronics industry.
Latest Patents
Ohtsuka's cutting-edge innovations include a semiconductor light-emitting device that utilizes phosphors for wavelength conversion. This device comprises a substrate and multiple isolated light-emitting element layers of semiconductor material, designed to have a wider band gap than the substrate. The inclusion of phosphors allows for the conversion of light wavelengths emitted from the light-emitting element layers into other wavelengths, enhancing the device's functionality.
Another significant patent is for a light-emitting semiconductor device featuring a quantum well active layer, accompanied by a fabrication method. This invention utilizes a low-resistivity silicon substrate with a carefully layered structure that includes a buffer layer, an n-type lower confining layer, and an active layer designed in a multiple quantum well configuration. The specific arrangements and proportions of materials such as InGaN and AlGaInN within the active layer are meticulously defined to prevent the evaporation or diffusion of indium, further improving the performance and reliability of the device.
Career Highlights
Ohtsuka is currently employed at Sanken Electric Co., Ltd., where he has continued to innovate and advance semiconductor technology. His work has pushed the boundaries of what is possible in light-emitting devices, making significant strides in efficiency and functionality that benefit various electronic applications.
Collaborations
Throughout his career, Ohtsuka has collaborated with esteemed colleagues such as Hirokazu Goto and Yoshiro Kutsuzawa. These partnerships have fostered an environment of innovation and have contributed to numerous successful projects within the company.
Conclusion
Koji Ohtsuka's contributions to the field of semiconductor devices underscore his role as a leading figure in technological innovation. With his extensive patent portfolio and collaborative spirit, he continues to pave the way for advancements that could shape the future of electronics. His work exemplifies the importance of creativity and perseverance in the realm of scientific research and innovation.