Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6801491 | Focus error detecting apparatus of optical pickup with a light separating and astigmatism generation optical element and detection method thereof | Masakazu Ogasawara, Takuma Yanagisawa | 2004-10-05 |