Masashi Kisaka

Title: Masashi Kisaka: Innovating Hard-Disk Drive Technology

Introduction

Masashi Kisaka, a distinguished inventor based in Kanagawa, Japan, holds an impressive portfolio of 36 patents. His contributions to the field of hard-disk drive (HDD) technology have significantly advanced storage solutions, demonstrating his innovative approach towards engineering challenges.

Latest Patents

Among his latest innovations is a sophisticated hard-disk drive that features a main control circuit. Notably, this circuit incorporates a frequency-hunting peak filter that enhances performance. The peak filter plays a pivotal role by ensuring that the gain at the center frequency is finite, with its transfer function represented in z-transform space. A remarkable aspect of this filter is that the denominator of its transfer function has a real part that becomes zero at the center frequency, while its imaginary part remains positive at this frequency.

Additionally, the HDD includes a frequency updating unit. This unit strategically updates the center frequency to effectively converge on the disturbance frequency by analyzing the phase difference between the input and output of the system. This innovation ensures optimal operation in various scenarios.

Another significant contribution is a disk drive and its associated controlling method. This invention enables precise measurement of non-linearity in head position control systems, providing a method that effectively inputs a reference signal into a voice coil motor while suppressing harmonic components within the control signals. This enhancement is crucial for reducing errors and improving overall drive performance.

Career Highlights

Kisaka has made his mark through his experiences at notable companies, including Hitachi Global Storage Technologies and International Business Machines Corporation (IBM). His work has consistently focused on breakthrough technologies in storage systems, cementing his reputation as a leading inventor in the field of HDD technology.

Collaborations

Throughout his career, Kisaka has worked alongside talented colleagues, including Yutaka Ozawa and Kenji Toga. Their collaborations have yielded impactful advancements in HDD design and functionality, reflecting a collective commitment to innovation.

Conclusion

Masashi Kisaka's contributions to the hard-disk drive industry underscore his role as a pioneer in technological advancement. With 36 patents, his innovative methodologies and designs continue to shape the future of data storage, marking him as a prominent figure in the realm of inventions and innovations.