This inventor holds 4 USPTO granted patents. Top assignee: Stanley Electric Co., Ltd. Active years: 1998-2011.
Location History:
- Yokohama, JP (1998)
- Tokyo, JP (2005 - 2011)
Company Filing History:
Years Active: 1998-2011
Title: Keizo Kawaguchi: Innovator in Semiconductor Technology
Introduction
Keizo Kawaguchi is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of 4 patents. His work focuses on enhancing the efficiency and performance of light-emitting devices.
Latest Patents
Kawaguchi's latest patents include a semiconductor light-emitting device that features a narrow radiation spectrum. This innovation allows radiation to occur when current is injected into an active layer from electrodes. The design incorporates a pair of clad layers that sandwich the active layer, with the clad layer having a band gap wider than that of the active layer. Additionally, an optical absorption layer is placed outside at least one clad layer, which has a band gap wider than that of the active layer and narrower than that of the clad layer. This configuration effectively narrows the spectrum of radiated light.
Another notable patent involves a semiconductor light-emitting device that includes a quantum well layer sandwiched between carrier confinement layers. The substrate is made of a group III-V compound semiconductor material, with the principal surface oriented about a (100) plane. The light-emitting lamination structure features a quantum well layer that is enclosed by a pair of carrier confinement layers made from a semiconductor material with a wider band gap. This design ensures that light emission recombination occurs in the quantum well layer rather than in the carrier confinement layers.
Career Highlights
Kawaguchi is currently employed at Stanley Electric Co., Ltd., where he continues to innovate in the semiconductor field. His work has been instrumental in advancing the technology used in light-emitting devices, contributing to the overall progress of the industry.
Collaborations
Throughout his career, Kawaguchi has collaborated with notable colleagues, including Ken Sasakura and Tsuyoshi Maruyama. These partnerships have fostered a collaborative environment that encourages innovation and the sharing of ideas.
Conclusion
Keizo Kawaguchi is a distinguished inventor whose work in semiconductor technology has led to significant advancements in light-emitting devices. His innovative patents and collaborations highlight his commitment to enhancing the efficiency and performance of these technologies.