Issued Patents All Time
Showing 26–38 of 38 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6801491 | Focus error detecting apparatus of optical pickup with a light separating and astigmatism generation optical element and detection method thereof | Masakazu Ogasawara, Sakashi Ohtaki | 2004-10-05 |
| 6590857 | Optical disk | Akinori Ohkubo, Takayuki Nomoto | 2003-07-08 |
| 6580676 | Recording information reproducing apparatus with crosstalk canceler | Shogo Miyanabe, Hiroki Kuribayashi | 2003-06-17 |
| 6563773 | Tracking control apparatus | Hiroki Kuribayashi | 2003-05-13 |
| 6333906 | Optical pickup and information reproducing apparatus | Shogo Miyanabe, Hiroki Kuribayashi | 2001-12-25 |
| 6124988 | Objective lens | Katsuhiro Koike, Masakazu Ogasawara | 2000-09-26 |
| 5856959 | Method for generating a focus error signal due to astigmatism and optical pickup device using the same | — | 1999-01-05 |
| 5850081 | Method for generating a focus error signal due to astigmatism and optical pickup device using the same | — | 1998-12-15 |
| 5615206 | Optical disk | Seiichi Ohsawa, Hiroki Kuribayashi | 1997-03-25 |
| 5546372 | Information detection light intensity control apparatus in optical disc recorded-information reproducing apparatus | Seiichi Ohsawa | 1996-08-13 |
| 5455817 | Second harmonics generating optical recording layer | Seiichi Ohsawa | 1995-10-03 |
| 5381391 | Optical recording medium having a third non-linear optical reflection film | Seiichi Ohsawa | 1995-01-10 |
| 5365052 | Optical information reading apparatus with controlled numerical aperture relationship between focusing and receiving optical systems | Seiichi Ohsawa | 1994-11-15 |