Location History:
- Kanagawa-ken, JP (2006)
- Kanagawa, JP (2009)
- Tokyo, JP (2010)
Company Filing History:
Years Active: 2006-2010
Title: Innovations of Hidefumi Tominaga
Introduction
Hidefumi Tominaga is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of disk drive technology, holding a total of 3 patents. His work focuses on enhancing the performance and stability of disk drives, particularly in the area of velocity control.
Latest Patents
Tominaga's latest patents include innovative methods and devices aimed at improving disk drive functionality. One of his key inventions is a calibration method for a disk drive that helps prevent destabilization in voice coil motor (VCM) velocity control. This invention involves a hard disk controller/multiprocessing unit (HDC/MPU) that calibrates a correction operational coefficient of a detected back electromotive force (EMF) voltage before unloading. The calibration occurs while the actuator is pivoting, utilizing VCM current and back EMF voltage detection to enhance performance.
Another significant patent is for a drive unit that effectively performs positioning control while managing disturbance components in the position error signal (PES). This invention includes an error signal generator that creates a PES based on servo data from a magnetic disk. By down-sampling the PES when the target frequency deviates from the effective frequency range of a digital filter, Tominaga's invention allows for improved control of the digital filter's setting frequency, thereby reducing signal components of the target frequency.
Career Highlights
Tominaga is currently employed at Hitachi Global Storage Technologies Netherlands B.V., where he continues to innovate in the field of storage technology. His work has been instrumental in advancing the capabilities of disk drives, making them more reliable and efficient.
Collaborations
Throughout his career, Tominaga has collaborated with notable colleagues, including Kenichi Kuramoto and Shinya Sakamoto. These collaborations have contributed to the development of cutting-edge technologies in the storage industry.
Conclusion
Hidefumi Tominaga's contributions to disk drive technology through his patents and innovations have significantly impacted the field. His work continues to influence advancements in storage solutions, showcasing the importance of innovation in technology.