Naobumi Nagasawa

Title: Naobumi Nagasawa: Innovator in Optical Disk Technology

Introduction

Naobumi Nagasawa is a prominent inventor based in Gunma, Japan. He has made significant contributions to the field of optical disk technology, holding a total of 5 patents. His work has greatly influenced the efficiency and performance of optical disk players.

Latest Patents

Nagasawa's latest patents include a signal processing circuit for an optical disk player. This invention allows for the main data in a digital signal, read from a CD type disk, to be decoded in accordance with a bit clock regenerated in a clock regenerator. The design enables synchronization of both writing and reading of data into and from memory with the bit clock. Additionally, a selector can switch the operation clock of the decoding means, allowing for a choice between time base precision and decoding ability based on the type of disk. This innovation enhances the speed of information retrieval from disks while minimizing size and power consumption of the disk motor.

Another notable patent is a circuit and method for searching tracks on a CD. This track search circuit includes a command decoder that decodes command data from a microcomputer. It outputs signals for commanding a track jump and counting a tracking error signal. The system calculates the time difference between a present A-time and a target A-time, allowing the optical pick-up to move toward the target position efficiently. The design ensures that the optical pick-up can accurately catch the target position by renewing the A-time based on the counted value of the counter.

Career Highlights

Nagasawa is currently employed at Sanyo Electric Co., Ltd., where he continues to innovate in the field of optical technology. His work has been instrumental in advancing the capabilities of optical disk players, making them more efficient and user-friendly.

Collaborations

Throughout his career, Nagasawa has collaborated with notable colleagues such as Hiroyuki Arai and Teruo Houshi. These collaborations have contributed to the development of cutting-edge technologies in the optical disk industry.

Conclusion

Naobumi Nagasawa's contributions to optical disk technology through his patents and work at Sanyo Electric Co., Ltd. highlight his role as a key innovator in the field. His inventions continue to shape the future of optical media technology.