Issued Patents All Time
Showing 76–95 of 95 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6400664 | Optical head including electrical circuit which produces focus error signal and tracking error signal unaffected by variations in intensity distributions of reflected light beams | Shigeru Nakamura, Kunikazu Ohnishi, Masayuki Inoue, Yukio Fukui | 2002-06-04 |
| 6333908 | Optical head having two semiconductor lasers of different wavelength, an objective lens focusing laser beams on different thickness substrates, and an annular phase shifter decreasing focused laser beam spot aberration | Akira Arimoto | 2001-12-25 |
| 6278548 | Polarizing diffraction grating and magneto-optical head made by using the same | Shigeru Nakamura | 2001-08-21 |
| 6272097 | Optical head and apparatus for recording and reproducing optical information through the use of the optical head | Takeshi Nakao, Shigeru Nakamura, Toshiaki Tanaka | 2001-08-07 |
| 6256284 | Optical head having two semiconductor lasers of different wavelength, an objective lens focusing laser beams on different thickness substrates, and an annular phase shifter decreasing focused laser beam spot abberation | Akira Arimoto | 2001-07-03 |
| 6215756 | Optical head having two lasers of different wavelength and an objective lens made of one material having a rectangular groove shifting phase to decrease focused laser beam spot aberration for focusing laser beams on different thickness substrates | Akira Arimoto | 2001-04-10 |
| 6185177 | Flying type optical head integrally formed with light source and photodetector and optical disk apparatus with the same | Kenchi Ito, Yooji Maruyama, Hiroyuki Awano | 2001-02-06 |
| 6125087 | Optical pickup for optical disk apparatus | Kunikazu Ohnishi, Masayuki Inoue, Tohru Sasaki, Yukio Fukui, Takeshi Nakao | 2000-09-26 |
| 5995474 | Flying type optical head integrally formed with light source and photodetector and optical disk apparatus with the same | Kenchi Ito, Yooji Maruyama, Hiroyuki Awano | 1999-11-30 |
| 5930220 | Tracking method for optical disk apparatus using diffraction light | Akira Arimoto, Takeshi Nakao, Masayuki Inoue, Kunikazu Ohnishi, Yoshio Suzuki | 1999-07-27 |
| 5889748 | Object lens and optical head for reproducing data from optical disks in different thickness of substrate | Masayuki Inoue, Akira Arimoto, Hiroyuki Minemura, Hisao Fujita, Hideaki Koyanagi | 1999-03-30 |
| 5886969 | High-density information recording/reproducing method | Takeshi Maeda, Hisataka Sugiyama, Hiroyuki Awano, Harukazu Miyamoto, Keikichi Andoo +5 more | 1999-03-23 |
| 5835469 | High-density information recording/reproducing method | Takeshi Maeda, Hisataka Sugiyama, Hiroyuki Awano, Harukazu Miyamoto, Keikichi Andoo +5 more | 1998-11-10 |
| 5784347 | Optical disk device having optical phase compensator | Harukazu Miyamoto, Hisataka Sugiyama, Mariko Umeda | 1998-07-21 |
| 5774444 | Split photo detector for detecting a central portion and a peripheral portion of a reflected light beam | Kimio Tatsuno, Kouichirou Wakabayashi, Takeshi Maeda, Hisataka Sugiyama | 1998-06-30 |
| 5715226 | Flying type optical head integrally formed with light source and photodetector and optical disk apparatus with the same | Kenchi Ito, Yooji Maruyama, Hiroyuki Awano | 1998-02-03 |
| 5668786 | Magneto-optic disk apparatus having means for eliminating fluctuation component in reproduction magneto-optic signal | Tohru Sasaki, Yoshiro Konishi, Toshimasa Kamisada, Motoyuki Suzuki, Naoki Mori +1 more | 1997-09-16 |
| 5615199 | Optical head apparatus | Kimio Tatsuno, Hiroshi Fukuda, Osamu Komoda | 1997-03-25 |
| 5615192 | Information recording and reproducing method and apparatus | Atsushi Kikukawa, Sumio Hosaka, Youji Maruyama, Toshimichi Shintani | 1997-03-25 |
| 5481386 | Flying type optical head integrally formed with light source and photodetector and optical disk apparatus with the same | Kenchi Ito, Yooji Maruyama, Hiroyuki Awano | 1996-01-02 |