Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5883873 | Focusing distance of an objective lens according to a vertical deviation standard of optical recording media with different thicknesses | — | 1999-03-16 |
| 5844879 | Optical head including ring-shaped light blocking or light non-converging portion | Yasusi Seike | 1998-12-01 |
| 5790506 | Optical recording and reproducing device | Yasusi Seike | 1998-08-04 |
| 5524002 | Disc reproduction apparatus | Norihiro Kurokawa, Yoshifusa Fujioka | 1996-06-04 |