Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4872152 | Light spot position control system and method by sampled servo | Masatoshi Ohtake, Wasao Takasugi, Seiji Yonezawa | 1989-10-03 |
| 4866688 | Composite tracking servo system for optical disc apparatus with track offset correction | Masatoshi Ohtake, Seiji Yonezawa, 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, Masatoshi Ohtake | 1989-07-11 |
| 4796246 | Method and apparatus for beam-track alignment in optical disk apparatus | Takeshi Mada | 1989-01-03 |