Issued Patents 2004
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6781931 | Optical information recording/reproducing apparatus and optical pickup apparatus | — | 2004-08-24 |
| 6778474 | Optical pickup device, optical disc apparatus and method of detecting track discrimination signal | — | 2004-08-17 |
| 6717897 | Optical pickup apparatus, optical disc apparatus, and track recognition signal detection method | — | 2004-04-06 |
| 6700842 | Optical head, photodetector, optical information recording and reproducing apparatus and focus error detecting method | — | 2004-03-02 |