Issued Patents 1994
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5345072 | Focus detection device for reading information from an optical recording medium | Hideki Hayashi, Shinichi Tanaka, Sadao Mizuno, Noboru Ito | 1994-09-06 |
| 5301182 | Optical pickup head | Seiji Nishino, Yoshikazu Hori | 1994-04-05 |
| 5296694 | Optical pick-up head apparatus with optical means having polarization anisotropy | Shin-ichi Kadowaki, Seiji Nishino, Hiroaki Yamamoto | 1994-03-22 |
| 5293038 | Optical pick-up head apparatus wherein hollographic optical element and photodetector are formed on semiconductor substrate | Shinichi Kadowaki, 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 | Shinichi Kadowaki, Naoyasu Miyagawa | 1994-03-08 |
| 5283771 | Optical pickup head | Shinichi Kadowaki, Seiji Nishino | 1994-02-01 |