Shuko Watanabe

Title: Shuko Watanabe: Innovator in Magnetic Tape Technology

Introduction

Shuko Watanabe is a notable inventor based in Kawasaki, Japan. He has made significant contributions to the field of magnetic tape technology, holding a total of 3 patents. His work has been instrumental in advancing the efficiency and functionality of magnetic tape apparatuses.

Latest Patents

Watanabe's latest patents include a magnetic tape apparatus that features a cartridge of a single reel. This apparatus records and reproduces information using a helical scan type with a rotary head. A control pulse is reproduced from a recording signal of a control track of the magnetic tape by a fixed head. The repositioning operation and high-speed search are controlled based on the control pulse. Additionally, a torque ripple of a capstan motor is measured in advance. When the tape runs, the motor drive current is adjusted to minimize torque changes, thereby improving wow and flutter. The switching timing of motor coils is set early to suppress torque fluctuations. Furthermore, a regenerative braking circuit is created through PWM control, and the tape thread and wrap during cartridge insertion are executed simultaneously.

Another patent focuses on a current supply circuit for a reel-drive motor in a magnetic tape apparatus. This circuit includes a conversion table that stores the relationship between the radius of the magnetic tape wound on a reel and the target current for the motor. The target current is converted to a digital command, which is then processed through a correction table to ensure accurate current flow. The command unit outputs the digital command, while the supply current control unit delivers the corresponding analog current to the motor. Two correction units are employed to refine the supply current based on actual performance.

Career Highlights

Shuko Watanabe is currently employed at Fujitsu Corporation, where he continues to innovate in the field of magnetic tape technology. His work has not only contributed to the company's advancements but has also set new standards in the industry.

Collaborations

Watanabe has collaborated with notable coworkers such as Makoto Sasaki and Ryuuichi Miyaguchi. Their combined expertise has fostered a productive environment for innovation and development.

Conclusion

Shuko Watanabe's contributions to magnetic tape technology exemplify his dedication to innovation. His patents reflect a deep understanding of engineering principles and a commitment to enhancing the functionality of magnetic tape apparatuses. His work continues to influence