Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5555232 | Optical head with built-in semiconductor laser, objective lens and 1/4 wavelength plate | Shohei Kobayashi, Takeshi Yamazaki, Haruhiko Takemura, Toshihiro Ogata | 1996-09-10 |
| 5249171 | Opto-magnetic pick-up device including phase difference correcting means | Nobuhide Matsubayashi, Kiichi Kato | 1993-09-28 |
| 5202877 | Apparatus for detecting unused sector on record medium | — | 1993-04-13 |
| 5159584 | Bias-Magnetic field generating system of photo-magnetic recording device | Kazuyasu Motoyama | 1992-10-27 |
| 5083303 | Sector mark detecting apparatus in optical disc apparatus | Motoo Azuma, Kenji Kikkawa | 1992-01-21 |
| 4837758 | Magneto-optical recording reproducing device having field applying means | Kazuyasu Motoyama, Mitsugu Sakai, Hitoshi Ichikawa, Akihiko Yoshizawa | 1989-06-06 |
| 4757487 | Method and apparatus for detecting track crossings on an optical disc | Kiichi Kato | 1988-07-12 |
| D288558 | Optical pickup for use in optical discs | Haruhiko Takemura, Nobuhide Matsubayashi, Masaharu Sakamoto | 1987-03-03 |
| 4472748 | Method of processing information signal with respect to opto-magnetic record medium | Kiichi Kato | 1984-09-18 |