Issued Patents All Time
Showing 26–50 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6798723 | Optical pickup head and information recording/reproducing device | Hideki Hayashi, Daisuke Ogata, Shin-ichi Kadowaki, Kousei Sano, Jouji Anzai +1 more | 2004-09-28 |
| 6573685 | Method of replacing secondary battery | Toshiaki Nakanishi, Hiromichi Kuno, Tadao Kimura, Yozoh Ogino, Kouji Otsubo +4 more | 2003-06-03 |
| 6532202 | Optical element, optical head and optical recording reproducing apparatus | Hidenori Wada, Shin-ichi Kadowaki, Hiroaki Yamamoto, Tetsuo Saimi, Daisuke Ogata +1 more | 2003-03-11 |
| 6480454 | Optical element, optical head using the optical element, and optical recording and reproducing apparatus using the optical element | Hidenori Wada, Daisuke Ogata, Seiji Nishino, Tetsuo Saimi | 2002-11-12 |
| 6292441 | Optical head device, optical information apparatus, and method for detecting focus error signal | Hiroaki Yamamoto, Daisuke Ogata, Ken'ichi Kasazumi, Seiji Nishino, Hidenori Wada | 2001-09-18 |
| 6272099 | Objective lens with center and periphery portions producing reciprocal interference, and optical head and optical disk device using the same | Yoshiaki Komma | 2001-08-07 |
| 6084845 | Optical head and an optical disk apparatus | — | 2000-07-04 |
| 6069860 | Optical head with objective lens having different numerical apertures to minimize light aberration with respect to optical disks of different thicknesses | Yoshiaki Komma | 2000-05-30 |
| 6024632 | Grinding method using grit stuck to a tool having low hardness | Akinori Hoshino, Tetsuya Morita, Satoru Shibata | 2000-02-15 |
| 5986779 | Multiple focus lens, an optical head apparatus and an optical information recording-reproducing apparatus | Yasuhiro Tanaka, Michihiro Yamagata, Yoshiaki Komma | 1999-11-16 |
| 5978346 | Optical head | Tsuguhiro Korenaga, Shinji Uchida | 1999-11-02 |
| 5920537 | Correction element of lower light intensity around an optical axis of an optical head with a plurality of focal points | Yoshiaki Komma, Hideki Hayashi, Kenichiro Urairi | 1999-07-06 |
| 5912868 | Optical head for reproducing data from first and second optical disks | Hideki Hayashi, Noboru Ito, Kenichiro Urairi, Yoshiaki Komma | 1999-06-15 |
| 5815293 | Compound objective lens having two focal points | Yoshiaki Komma, Seiji Nishino | 1998-09-29 |
| 5790503 | Optical head | Tsuguhiro Korenaga, Shinji Uchida | 1998-08-04 |
| 5775975 | Method of lapping a bevel gear | Akinori Hoshino, Tetsuya Morita | 1998-07-07 |
| 5768251 | Optical recording/reproducing apparatus for high density multilayered disks | Noboru Ito, Shinichi Tanaka, Kenichi Nishiuchi | 1998-06-16 |
| 5754512 | Correction elements to lower light intensity around an optical axis of an optical head with a plurality of focal points | Yoshiaki Komma, Hideki Hayashi, Kenichiro Urairi | 1998-05-19 |
| 5703856 | Optical head and optical data recording and reproducing apparatus having the same | Hideki Hayashi, Noboru Ito, Kenichiro Urairi, Yoshiaki Komma | 1997-12-30 |
| 5695390 | Finishing machines for internal spline tooth surfaces | Akinori Hoshino, Tetsuya Morita | 1997-12-09 |
| 5644413 | Optical head for adjusting a positional relation between the information medium and the optical head | Yoshiaki Komma, Makoto Kato, Hidenori Wada, Seiji Nishino | 1997-07-01 |
| 5627816 | Multilayer optical disk and apparatus | Noboru Ito, Shinichi Tanaka, Kenichi Nishiuchi | 1997-05-06 |
| 5591065 | Method of dressing honing wheels | Akinori Hoshino, Akira Muraoka, Hiroyuki Takahashi | 1997-01-07 |
| 5563873 | Multilayer optical disk and apparatus | Noboru Ito, Shinichi Tanaka, Kenichi Nishiuchi | 1996-10-08 |
| 5446565 | Compound objective lens having two focal points | Yoshiaki Komma, Seji Nishino | 1995-08-29 |