Akira Motoyama

Title: Akira Motoyama: Innovator in Optical Disk Technology

Introduction

Akira Motoyama is a notable inventor based in Saitama, Japan. He has made significant contributions to the field of optical disk technology, holding a total of 4 patents. His work focuses on improving the efficiency and accuracy of tracking error signals in optical disk players.

Latest Patents

Motoyama's latest patents include a circuit for digitally generating a tracking error signal to avoid offset. This innovative circuit computes a tracking error signal digitally, utilizing appropriate timing to latch input RF signals in successive latches. The outputs of these latches are then compared to enhance the accuracy of the tracking error signal. The circuit leverages servo patterns on disk surfaces, particularly optical disks, to provide track count and on-track status. This digital approach eliminates the need for capacitors or other sample-and-hold circuitry, streamlining the process of controlling offset values.

Another significant patent is a servo circuit for generating a tracking error signal for optical disks. This servo circuit is designed for use in optical disk players and can effectively track disks that are eccentrically positioned without causing abnormal sampling of the RF signal. The circuit includes a first comparator for comparing RF signals from wobbled pits on an optical disk, generating a difference signal that indicates the level difference between the RF signals. It also features a holding means for maintaining the difference signal for a predetermined period, along with a reference level producing circuit to set reference levels based on previously sampled signals.

Career Highlights

Motoyama is currently employed at Pioneer Electronic Corporation, a leading company in the field of electronics and optical technology. His work has significantly advanced the capabilities of optical disk players, making them more reliable and efficient.

Collaborations

Throughout his career, Motoyama has collaborated with talented individuals such as Hiroyuki Hirano and Fumihiko Yokogawa. These collaborations have contributed to the development of innovative technologies in the optical disk sector.

Conclusion

Akira Motoyama's contributions to optical disk technology through his patents and work at Pioneer Electronic Corporation highlight his role as a key innovator in the field. His advancements in tracking error signal generation have paved the way for more efficient optical disk players.