Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7457222 | Optical element, optical pickup unit, and optical disk drive unit | Hideaki Hirai | 2008-11-25 |
| 7426169 | Optical pickup apparatus and optical pickup method | — | 2008-09-16 |
| 7307938 | Optical pickup apparatus having an improved holographic unit, and optical disk drive including the same | — | 2007-12-11 |
| 7197003 | Optical element, optical pickup unit, and optical disk drive unit | Hideaki Hirai | 2007-03-27 |
| 7177258 | Optical pickup apparatus, optical data recording/reproducing apparatus, and optical data recording/reproducing method | Hiroyoshi Funato | 2007-02-13 |
| 6937554 | Optical pickup apparatus having an improved holographic unit, and optical disk drive including the same | — | 2005-08-30 |
| 6876621 | Optical apparatus for recording/reproducing and reading/reproducing data on an optical recording medium, and method for using same | Hiroyoshi Funato | 2005-04-05 |
| 6810001 | Optical pickup apparatus and optical pickup method adapted for selectively using laser light of different wavelengths | — | 2004-10-26 |
| 5956302 | Optical pick-up device and method using a high-density double diffraction grating | Hideo Maeda | 1999-09-21 |
| 5684779 | Optical head with forward and reflected light beams propagating through a dual diffraction grating device along a common path | Hiroyoshi Funato | 1997-11-04 |
| 5428588 | Optical head | — | 1995-06-27 |
| 5325348 | Wavelength converting element and system for recording and reproducing optical information | Hideo Maeda, Eiji Noda | 1994-06-28 |
| 5278817 | Optical pick-up for use with an opto-magnetic signal | Hideo Maeda, Junichi Kitabayashi | 1994-01-11 |
| 5243583 | Optical pickup device with dual grating element | Yuji Sumi | 1993-09-07 |
| 5231620 | Magneto-optical recording/reproducing apparatus with light beam splitting means | — | 1993-07-27 |
| 5115423 | Optomagnetic recording/reproducing apparatus | Hideo Maeda, Junichi Kitabayashi | 1992-05-19 |
| 5107477 | Integrated optical pick-up device | Kazuhiro Fujita, Toshiyuki Inokuchi, Nobuyuki Baba, Hideo Maeda | 1992-04-21 |
| 5107359 | Optical wavelength-divison multi/demultiplexer | — | 1992-04-21 |
| 5101389 | Optical information recording/reproducing apparatus | Junichi Kitabayashi, Hideo Maeda | 1992-03-31 |
| 5097462 | Integrated optical pick-up device | Kazuhiro Fujita, Toshiyuki Inokuchi, Nobuyuki Baba, Hideo Maeda | 1992-03-17 |
| 5060212 | Integrated optical pick-up device | Kazuhiro Fujita, Toshiyuki Inokuchi, Nobuyuki Baba, Hideo Maeda | 1991-10-22 |
| 5015835 | Optical information reading and writing device with diffraction means | Junichi Kitabayashi, Toshiyuki Inokuchi | 1991-05-14 |
| 4935911 | Optical head device for recording and reproducing information | Toshiyuki Inokuchi, Nobuyuki Baba, Kazuhiro Fujita, Hideo Maeda | 1990-06-19 |