Yutaka Osada

Title: Yutaka Osada: Innovator in Optical Disc Technology

Introduction

Yutaka Osada is a prominent inventor based in Fujisawa, Japan. He has made significant contributions to the field of optical disc technology, holding a total of 13 patents. His work has focused on improving the reliability and efficiency of optical disc apparatuses.

Latest Patents

One of his latest patents is an optical disc apparatus and method for reading information from an optical disk having tracks and spaces between the tracks on which address information is recorded. This innovative apparatus reads address information from an optical disc with tracks and track spaces. It features an optical head that irradiates the disc with light and includes tracking detectors divided into a first detector and a second detector in the track direction. These detectors detect the light reflected from the disc and output detection signals. An adjusting circuit adjusts the amplitudes of the first and second detection signals, outputting the signals at a position where the address information is recorded. A differential amplifying circuit then outputs a differential signal, which is the difference between the adjusted first and second detection signals. Finally, an address detecting circuit detects the address information based on the differential signal, ensuring accurate detection of information being recorded on the correct track and improving reliability during recording.

Another notable patent is a recording clock generating device and method. This invention addresses issues such as crosstalk between tracks, land prepit leakage, and the effects of recording power modulation, which can cause irregular changes in the wobble signal period, leading to jitter in the recording clock. The recording clock generating circuit averages the wobble signal period and includes a timer for generating a rectangular wave with a period similar to the average period. A frequency multiplying phase-locked loop (PLL) multiplies the timer output, enhancing recording clock stability.

Career Highlights

Yutaka Osada has worked with notable companies, including the Victor Company of Japan, Limited. His experience in these organizations has contributed to his expertise in optical disc technology and innovation.

Collaborations

Throughout his career, Osada has collaborated with talented individuals such as Yasuhiro Ueki and Kohjyu Konno. These collaborations have likely enriched his work and led to advancements in the field.

Conclusion

Yutaka Osada's contributions to optical disc technology through his patents and collaborations highlight his role as an influential inventor.