Dong-Ju Lee

Title: Dong-Ju Lee: Optical Disc Drive Inventor

Introduction

Dong-Ju Lee is an inventor associated with optical disc drive technology. Based in Seoul, South Korea, he is credited with 2 patents concerning mechanisms for positioning and driving optical components.

Latest Patents

Lee’s patent, “Objective Lens Drive Apparatus Where Interaction of Drive Magnets and Drive Coils Drive a Holding Member That Holds the Objective Lens and Optical Pickup and Optical Disk Apparatus Including the Same,” describes an apparatus that moves an objective lens to focus a laser beam on an optical disk. It uses opposing drive magnets and multiple coils to move a member holding the lens, supporting tracking and focusing functions.

His patent “Optical Disc Drive” describes a compact drive using a voice coil motor magnet with a tracking coil and two focusing coils. The tracking coil spans the poles of adjacent permanent magnets, while each focusing coil sits over one magnet on either side of the tracking coil.

Career Highlights

Lee’s listed company affiliations include Ricoh Company, Ltd., and Hitachi, Ltd. His patent work reflects engineering focused on optical disc drives and the precise movement of lenses and other optical components.

Collaborations

Lee’s listed coworkers include No-Cheol Park and Takeshi Shimano. Their shared professional context connects them to work in optical and drive technologies.

Conclusion

Dong-Ju Lee’s patents document contributions to compact optical disc drive design and the mechanisms that position lenses for reading optical media.