Kunihito Higa

Title: Innovations by Kunihito Higa

Introduction

Kunihito Higa is a notable inventor based in Kamisato, Japan. He has made significant contributions to the field of magnetic disc technology, holding a total of 5 patents. His work focuses on improving the efficiency and accuracy of magnetic head and magnetic disc inspection and recording methods.

Latest Patents

Higa's latest patents include an inspection device or method for magnetic heads or magnetic discs, as well as a magnetic disc recording device and method. These innovations allow for the formation of a servo pattern applicable to a write system. In his inspection and recording methods, a magnetic disc is rotated while a servo pattern is written into a designated region by a magnetic head's write-in element. This pattern is then read by the head's read-in element. The servo following of the magnetic head's position is based on a servo pattern that consists of multiple patterns. These patterns are written in at a first frequency to facilitate servo following and are overwritten at a second frequency, which differs from the first, except for the servo following width.

Higa's inspection device also addresses the reduction of position information demodulation errors caused by magnetic disc eccentricity. It enhances position signal detection accuracy and enables quick eccentricity clock correction for various clock frequencies. The device includes a servo demodulation unit, a PLL clock generating unit, and a tester control unit. The PLL clock generating unit features an eccentricity correction circuit that adjusts the reference clock frequency based on the magnetic disc's eccentricity.

Career Highlights

Kunihito Higa is associated with Hitachi High-Technologies Corporation, where he has been instrumental in advancing magnetic disc technology. His innovative approaches have led to significant improvements in the field.

Collaborations

Higa has collaborated with notable coworkers, including Yoshihiro Sakurai and Yukio Yamamoto, contributing to the development of cutting-edge technologies in magnetic disc inspection and recording.

Conclusion

Kunihito Higa's contributions to magnetic disc technology through his patents and collaborations have significantly impacted the industry. His work continues to pave the way for advancements in magnetic head and disc inspection methods.