Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5671199 | Detecting apparatus for detecting a tracking error signal in an optical information recording and/or reproducing apparatus and an optical information recording and/or reproducing apparatus | — | 1997-09-23 |
| 5657305 | Optical information recording and reproducing apparatus including a total reflection surface or a light shield plate disposed between a polarized light separating surface and a detection device for light beam compensation | Kenichi Sasaki | 1997-08-12 |