Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872152 | Light spot position control system and method by sampled servo | Toshiaki Tsuyoshi, Wasao Takasugi, Seiji Yonezawa | 1989-10-03 |
| 4866688 | Composite tracking servo system for optical disc apparatus with track offset correction | Seiji Yonezawa, Toshiaki Tsuyoshi, Kazuo Ichino, Yukio Fukui, Takashi Takeuchi +2 more | 1989-09-12 |
| 4847822 | Optical information recording and reproducing apparatus with tracking control by sampling | Wasao Takasugi, Seiji Yonezawa, Toshiaki Tsuyoshi | 1989-07-11 |