Issued Patents All Time
Showing 76–77 of 77 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5535058 | Focus error detecting element and optical head using the same | Yasuhiro Tanaka | 1996-07-09 |
| 5473471 | Complex lens with diffraction grating | Yasuhiro Tanaka | 1995-12-05 |