Location History:
- Kokubunji, JA (1976 - 1977)
- Tokorozawa, JA (1977)
- Saitama, JP (1988)
Company Filing History:
Years Active: 1976-1988
Title: Yasutsugu Takeda: Innovator in Semiconductor Technology
Introduction
Yasutsugu Takeda is a prominent inventor based in Kokubunji, Japan. He has made significant contributions to the field of semiconductor technology, holding a total of 5 patents. His work focuses on enhancing the efficiency and functionality of semiconductor lasers and optical information systems.
Latest Patents
One of Takeda's latest patents is for a semiconductor laser that achieves high efficiency of luminescence. This innovation involves forming a spatial fluctuation of potential, allowing for localization of electrons and holes or excitons in multiple dimensions. Specifically, the design includes corrugations or ruggedness on the active layer's surface, with a mean pitch of below 100 nm and a level difference of 1/10 to 1/2 of the mean thickness of the active layer.
Another notable patent is for an apparatus designed for optically reconstructing information. This apparatus features a disc with groups of dots that bear information, which are arranged either concentrically or spirally. It includes a mechanism for rotating the disc, a light source that projects a beam onto the dots, and photodetectors that detect diffracted light waves. A semiconductor laser array serves as the light source, with the ability to switch between laser sources in tracking the information.
Career Highlights
Yasutsugu Takeda is currently employed at Hitachi, Ltd., where he continues to push the boundaries of semiconductor technology. His work has been instrumental in advancing the capabilities of optical devices and information processing systems.
Collaborations
Throughout his career, Takeda has collaborated with notable colleagues, including Yoshito Tsunoda and Fumio Imagawa. These partnerships have contributed to the development of innovative technologies in the semiconductor field.
Conclusion
Yasutsugu Takeda's contributions to semiconductor technology and optical information systems highlight his role as a leading inventor in Japan. His innovative patents reflect a commitment to advancing technology and improving efficiency in electronic devices.