Location History:
- Hachioji, JP (1979 - 1985)
- Tsukuba, JP (1991)
Company Filing History:
12 out of 42,485 
1 out of 1,112 Years Active: 1979-1991
Title: Innovations of Jun-ichi Umeda
Introduction
Jun-ichi Umeda is a notable inventor based in Hachioji, Japan. He has made significant contributions to the field of optical recording technology and semiconductor devices. With a total of 12 patents to his name, Umeda's work has had a considerable impact on the industry.
Latest Patents
One of his latest patents is for a unit and disc having a relatively rough surface and method of producing it. This optical recording disc comprises a resin layer formed on a relatively rough surface of each transparent disc substrate. The resin material has a refractive index approximately equal to that of the transparent disc substrate. This innovation allows for a decrease in production costs and improves the signal-to-noise ratio when writing and reading information signals from the recording layer compared to conventional optical recording discs. Another significant patent is for a phase-locked semiconductor laser device. This device includes a semiconductor substrate and a semiconductor assembly for optical confinement, which consists of an active layer and cladding layers. The design features multiple regions in the semiconductor assembly that create variations in the complex refractive index for a laser beam, enhancing the quality of the laser device.
Career Highlights
Throughout his career, Jun-ichi Umeda has worked with prominent companies such as Hitachi, Ltd. and Hitachi Maxell, Limited. His experience in these organizations has allowed him to develop and refine his innovative ideas in technology.
Collaborations
Umeda has collaborated with several talented individuals in his field, including Takashi Kajimura and Michiharu Nakamura. These partnerships have contributed to the advancement of his inventions and the overall progress in optical and semiconductor technologies.
Conclusion
Jun-ichi Umeda's contributions to the fields of optical recording and semiconductor devices demonstrate his innovative spirit and technical expertise. His patents reflect a commitment to improving technology and reducing production costs, making him a significant figure in the industry.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.