Hitoshi Furuhata

Title: Hitoshi Furuhata: Optical Recording and Pickup Inventions

Introduction

Hitoshi Furuhata is an inventor associated with Tokorozawa, Japan, and Pioneer Corporation. His work includes optical technologies designed to improve the reading and reproduction of information from optical recording media. He is credited with 5 patents.

Latest Patents

Furuhata’s listed patents include inventions addressing optical pickup performance and compatibility with different optical discs.

“Optical Pickup Device and Optical Recording Medium Information Reproduction Device” describes a system for reproducing information from multiple kinds of optical discs with different track pitches. It uses a main beam and sub-beams formed from pairs of semi-sub-beams. Their spot positions are arranged in relation to the track pitches, enabling the device to read discs with differing track layouts.

“Optical Pickup” concerns detecting reflected and return light from an information recording medium when the wavelength of a semiconductor laser varies. The invention sets the transmittances of a half mirror for outgoing laser light and returning light according to specified conditions, helping maintain appropriate detection despite wavelength variation.

Career Highlights

Furuhata’s patent work reflects a focus on optical disc systems, including pickup devices and information reproduction. These inventions address practical challenges in reading recorded data, such as differences in disc track pitch and changes in laser wavelength.

Collaborations

Furuhata is associated with Pioneer Corporation. His listed coworkers include Tomotaka Nishimura and Masayuki Koyama.

Conclusion

Hitoshi Furuhata’s recorded inventions focus on improving optical pickup and disc-reading technologies, with an emphasis on reliable reproduction across different media and operating conditions.