Kiyoshi Shidara

Title: Kiyoshi Shidara: Innovator in Optical Disc Technology

Introduction

Kiyoshi Shidara is a prominent inventor based in Saitama, Japan. He has made significant contributions to the field of optical disc technology, holding a total of 7 patents. His work focuses on enhancing the performance and efficiency of semiconductor laser devices used in optical disc applications.

Latest Patents

Shidara's latest patents include a semiconductor laser driving device and an optical disc device. The semiconductor laser driving device is designed to adjust the recording laser light power from a semiconductor laser to a desired level. It features a front monitor photodiode (PD) positioned near the semiconductor laser light source, which detects the recording layer light power. A system controller stores an approximating equation for a correction coefficient based on the detection signal characteristics when the recording laser light is a multi-pulse signal. This allows for precise feedback control of the laser power emitted from the laser diode (LD).

The optical disc apparatus incorporates an automatic power control circuit that regulates the power of laser light. It achieves this by comparing the detected value from a front monitor with a target value for both reproduction and recording power. The system includes a detector for light reflected from the optical disc and a sample-hold circuit that performs operations at the timing of the reproduction power. A microcomputer computes a reference value from the reflected light just before the recording operation begins, ensuring optimal performance during recording.

Career Highlights

Kiyoshi Shidara has dedicated his career to advancing optical disc technology. His innovative designs and patents have significantly impacted the industry, particularly in improving the reliability and efficiency of optical disc devices. He is currently associated with Teac Corporation, where he continues to develop cutting-edge technologies.

Collaborations

Shidara has worked alongside notable colleagues, including Mitumasa Kubo and Takashi Miyamoto. Their collaborative efforts have contributed to the success of various projects within the optical disc technology sector.

Conclusion

Kiyoshi Shidara's contributions to optical disc technology through his patents and innovative designs have established him as a key figure in the field. His work continues to influence advancements in semiconductor laser applications, ensuring enhanced performance in optical disc devices.