Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885732 | Optical pickup apparatus for detecting and correcting focusing and tracking errors in detected recorded signals | Hiroshi Sunagawa, Hiroshi Nishihara | 1989-12-05 |
| 4868803 | Magneto-optic pickup head including tracking and focusing error correction | Hiroshi Sunagawa, Hiroshi Nishihara | 1989-09-19 |
| 4859033 | Method of producing optical head assembly | Keizo Kono, Mitsushige Kondou, Natsuro Tsubouchi, Shiro Hine, Hiroshi Nishihara | 1989-08-22 |
| 4833561 | Pickup apparatus for magneto-optical recording medium | Hiroshi Sunagawa, Hiroshi Nishihara | 1989-05-23 |