Issued Patents All Time
Showing 26–48 of 48 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7272091 | Birefringence characteristic measuring method, optical recording medium and optical information recording/reproducing apparatus | — | 2007-09-18 |
| 7242647 | Optical head unit and optical information writing/reading device | — | 2007-07-10 |
| 7200076 | Radial tilt detection optical head apparatus and optical information apparatus | — | 2007-04-03 |
| 7136344 | Optical head device and optical information recording/reproducing apparatus | — | 2006-11-14 |
| 7085218 | Optical head device and optical information recording or reproducing device | — | 2006-08-01 |
| 6980505 | Optical head apparatus including two light sources and one photodetector | Eiichi Ueda, Taku Tsuboi | 2005-12-27 |
| 6963522 | Optical head apparatus and optical information recording and reproducing apparatus | — | 2005-11-08 |
| 6894958 | Optical system for detecting data signal and tracking error signal | — | 2005-05-17 |
| 6804180 | Optical head assembly and optical information recording/reproducing device | — | 2004-10-12 |
| 6788628 | Optical head and optical data recording/reproducing apparatus using the same | — | 2004-09-07 |
| 6707773 | Optical head and optical information recording and playback apparatus | — | 2004-03-16 |
| 6594206 | Optical head and optical information recording/reproducing device | — | 2003-07-15 |
| 6434092 | Optical head for land and groove recording | — | 2002-08-13 |
| 6282164 | Optical head having a phase-shifting diffraction grating | — | 2001-08-28 |
| 6201780 | Optical head with a phase plate for different types of disks | — | 2001-03-13 |
| 6046851 | Polarization beam splitter and method for making the same | — | 2000-04-04 |
| 5875167 | Optical head device | — | 1999-02-23 |
| 5696750 | Optical head apparatus for different types of disks | — | 1997-12-09 |
| 5600614 | Optical head system having super resolution element | — | 1997-02-04 |
| 5570333 | Head device for magneto-optical disk | — | 1996-10-29 |
| 5453963 | Magneto-optical head system for detection of error and information signals by diffraction lights | Yutaka Yamanaka | 1995-09-26 |
| 5426626 | Photodetecting system for a magneto-optical disk head system | — | 1995-06-20 |
| 5353267 | Magneto-optical light detector apparatus | — | 1994-10-04 |