Issued Patents 1994
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 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, Yoshiaki Komma | 1994-03-08 |