Company Filing History:
Years Active: 2002-2007
Title: Hirofumi Ohsawa: Innovator in Servo Track Technology
Introduction
Hirofumi Ohsawa is a notable inventor based in Kawasaki, Japan. He has made significant contributions to the field of servo track technology, holding a total of 3 patents. His work primarily focuses on enhancing the performance and accuracy of disk drives.
Latest Patents
Ohsawa's latest patents include a "Servo track writing device and method thereof." This invention features a vibration extraction processing unit that corrects clock jitter by extracting a deflection component synchronous with a rotation from a clock signal of a non-contact sensor. Additionally, a clock generating unit produces a clock signal of any format frequency based on the extracted signal. The sector correction processing unit measures frequency deflection errors to adjust the writing start position for format pattern signals stored in memory. Another significant patent is the "Servo track writer and driving method therefor." This device is designed for writing servo track signals to disk media in disk drives. It includes an internal actuator for moving the reading/writing head and an external actuator with a solid deformation element for precise control.
Career Highlights
Hirofumi Ohsawa is currently employed at Fujitsu Corporation, where he continues to innovate in the field of disk drive technology. His work has been instrumental in improving the efficiency and reliability of data storage solutions.
Collaborations
Ohsawa has collaborated with notable coworkers such as Yukio Ozaki and Seiji Kino, contributing to advancements in their shared field of expertise.
Conclusion
Hirofumi Ohsawa's contributions to servo track technology have made a lasting impact on the industry. His innovative patents and work at Fujitsu Corporation highlight his role as a key figure in advancing disk drive technology.