Issued Patents 1997
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5687146 | Focus control device for use with an optical pickup comprising a refracting means | Noriaki Murao | 1997-11-11 |
| 5666340 | Optical recording medium information reproducing apparatus | — | 1997-09-09 |
| 5633844 | Optical pickup device with three beam tracking servo control using oval beams | Hajime Koyanagi | 1997-05-27 |
| 5612937 | Optical pickup apparatus having a bisected optical receiving element for tracking control | — | 1997-03-18 |