Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4888760 | Optical head apparatus | Shinsuke Shikama, Mitsushige Kondou, Kazuo Iwata | 1989-12-19 |
| 4835761 | Signal to noise ratio of optical head apparatus employing semiconductor laser beam source | Shinsuke Shikama | 1989-05-30 |
| 4817072 | Optical head utilizing diffraction grating | Shinsuke Shikama, Mitsushige Kondo | 1989-03-28 |
| 4811329 | Optical head with laser having particular source of driving current | Shinsuke Shikama, Mitsushige Kondo | 1989-03-07 |
| 4797545 | Optical head device having positionally adjustable parts | Shinsuke Shikama, Mitsushige Kondo | 1989-01-10 |