Issued Patents 1994
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5293038 | Optical pick-up head apparatus wherein hollographic optical element and photodetector are formed on semiconductor substrate | Yoshiaki Komma, Seiji Nishino | 1994-03-08 |
| 5293367 | Optical pickup head wherein an error signal is produced by detecting a phase difference in diffraction beams from a holographic optical element | Yoshiaki Komma, Naoyasu Miyagawa | 1994-03-08 |
| 5283771 | Optical pickup head | Yoshiaki Komma, Seiji Nishino | 1994-02-01 |