Issued Patents All Time
Showing 51–68 of 68 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5623478 | Apparatus for reproducing an optical recording medium having first and second pit strings on opposite sides of each track | — | 1997-04-22 |
| 5606545 | Reproducing apparatus having a detector for simultaneously scanning adjacent tracks of an optical recording medium | Goro Fujita | 1997-02-25 |
| 5602810 | Tracking error generating method using sampling of servo pits and switching of differential signals | Goro Fujita | 1997-02-11 |
| 5577018 | Phase changing apparatus and optical pickup apparatus for magneto-optic storage device using same | Katsuhiro Seo, Kimihiro Saito, Kiyoshi Toyota | 1996-11-19 |
| 5563872 | Optical recording medium having first and second pit strings on opposite sides of each track | — | 1996-10-08 |
| 5563869 | Prism has a plurality of reflective regions each with a predetermined phase difference | Katsuhiro Seo, Kimihiro Saito, Kiyoshi Toyota | 1996-10-08 |
| 5559786 | Information recording on a track by logical operation of the information on a neighboring track | Goro Fujita | 1996-09-24 |
| 5557602 | Optical recording medium, recording and reproducing method and tracking error generating method | Goro Fujita | 1996-09-17 |
| 5557600 | Optical recording medium with trays located so that multiple tracks can be scanned simultaneously | — | 1996-09-17 |
| 5553046 | Optical recording medium and playback method utilizing pits on track center and wobble pits | — | 1996-09-03 |
| 5513161 | Optical recording medium, recording and reproducing method and tracking error generating method | Goro Fujita | 1996-04-30 |
| 5416766 | Optical recording medium and playback method thereof | — | 1995-05-16 |
| 5323373 | Optical pickup device | — | 1994-06-21 |
| 5070496 | Laser reproducing apparatus | Hiroshi Ogawa | 1991-12-03 |
| 4964110 | Apparatus for reproducing a magneto-optical disk using a shot noise reduction circuit | Hiroshi Ogawa | 1990-10-16 |
| 4959820 | Magnetooptical recording apparatus with constant leakage magnetic and pulse modulated magnetic field | Yoshio Aoki | 1990-09-25 |
| 4907211 | Magneto-optical recording apparatus having an inversion signal detecting means | Yoshio Aoki | 1990-03-06 |
| 4771347 | Magneto-optical recording system | Osamu Kawakubo, Yoshio Aoki | 1988-09-13 |