Hideharu Takeshima

Title: Innovations of Hideharu Takeshima

Introduction

Hideharu Takeshima is a notable inventor based in Kanagawa, Japan. He has made significant contributions to the field of magneto-optical recording technology. With a total of 3 patents to his name, Takeshima has demonstrated a commitment to advancing the capabilities of optical storage media.

Latest Patents

One of his latest patents is titled "Magneto-optical recording medium and writing and readout method therefor." This invention features a magneto-optical recording medium that includes a writing layer on a transparent substrate. The substrate is designed with a groove that has a flat bottom surface and a flat land, allowing for writing or readout to occur on either the groove or the land by simply irradiating a laser beam from the substrate side. The invention ensures that the sum of the phase shifts of the reflected light has an opposite sign to a phase shift caused by interference of reflected lights from the groove and the land.

Another significant patent is for an "Optical disk having a large storage capacity." This magneto-optical disk includes a recording film on a substrate that defines a data area. The data area is divided into multiple zones in the radial direction, with each zone containing several physical tracks divided into sectors. The design increases the number of sectors per physical track as one moves toward the outer edge of the disk. Additionally, the shortest mark length in specified zones near the inner and outer edges is longer than in other zones, enhancing the reliability of recording and reproducing characteristics.

Career Highlights

Hideharu Takeshima is currently employed at Mitsubishi Chemical Corporation, where he continues to innovate in the field of optical technologies. His work has been instrumental in developing advanced recording media that meet the growing demands for data storage.

Collaborations

Takeshima has collaborated with several talented individuals, including Masae Kubo and Kyuuya Narita. These collaborations have contributed to the successful development of his patented technologies.

Conclusion

Hideharu Takeshima's contributions to magneto-optical recording technology highlight his innovative spirit and dedication to advancing data storage solutions. His patents reflect a deep understanding of optical media and its potential for future applications.