Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4862446 | Optical focus error control pickup device for an optical recording/reproducing system | — | 1989-08-29 |
| 4847480 | Focus error detecting apparatus | Susumu Nomura | 1989-07-11 |
| 4805992 | Astigmatism generator | — | 1989-02-21 |