Issued Patents 1997
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5703863 | Optical device which detects reflected light with a push-pull method without dividing the reflected light | Masato Doi, Takashi Nakao | 1997-12-30 |
| 5679947 | Optical device having a light emitter and a photosensor on the same optical axis | Masato Doi, Osamu Matsuda, Kenji Sahara | 1997-10-21 |
| 5608233 | Optical device for magneto-optical disc system | Kenji Sahara, Masato Doi, Osamu Matsuda | 1997-03-04 |