Issued Patents All Time
Showing 1–25 of 29 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7903507 | Optical pickup device and method of laying out the same | Kenji Nagatomi | 2011-03-08 |
| 7782735 | Optical pickup device capable of handling a plurality of laser light beams having different wavelengths | Kenji Nagatomi | 2010-08-24 |
| 7609606 | Optical pickup device | Kenji Nagatomi, Yoichi Tsuchiya | 2009-10-27 |
| 7558184 | Optical pickup device | Kenji Nagatomi, Tetsuhisa Hosokawa | 2009-07-07 |
| 7525897 | Optical pickup device | Kenji Nagatomi | 2009-04-28 |
| 7420894 | Optical pickup device | Kenji Nagatomi | 2008-09-02 |
| 7376166 | Semiconductor laser apparatus and optical pickup apparatus | Masayuki Hata, Yasuyuki Bessho, Yasuhiko Nomura, Masayuki Shono, Yoichi Tsuchiya | 2008-05-20 |
| 7209415 | Optical pickup device and recording and/or reproducing device | Kenji Nagatomi, Yoichi Tsuchiya | 2007-04-24 |
| 6693856 | MAGNETO-OPTICAL DISK APPARATUS CAPABLE OF ACCURATE REPRODUCTION OF SIGNAL BY REMOVING MAGNETIC INFLUENCE BY MAGNET INCLUDED IN OPTICAL HEAD AND METHOD OF DETECTING INTENSITY OF MAGNETIC FIELD APPLIED BY MAGNET | Masaaki Shidochi, Kanichi KOYAMA, Yoichi Tsuchiya, Mitsuhiko Maeda, Seiichiro Takahashi | 2004-02-17 |
| 6574182 | Optical pickup compatible with a plurality of types of optical disks having different thicknesses | Masato Yamada, Yasuyuki Kanou, Yoichi Tsuchiya | 2003-06-03 |
| 6552990 | Optical head for two different disk thicknesses with a light beam diameter control device | Yoichi Tsuchiya, Masato Yamada, Yasuyuki Kanou, Shuichi Ichiura | 2003-04-22 |
| 6438097 | Optical recording disc capable of preventing illegal copy | Youichi Tsuchiya, Kenji Torazawa, Kouichi Tada | 2002-08-20 |
| 6321028 | Optical disk recording/reproduction apparatus for recording/reproducing information to/from optical disk of different standards | Yoichi Tsuchiya, Yasuyuki Kanou, Shuichi Ichiura, Hitotoshi Kimura, Toshio Harada +1 more | 2001-11-20 |
| 6262967 | Optical recording disc capable of preventing illegal copy | Youichi Tsuchiya, Kenji Torazawa, Kouichi Tada | 2001-07-17 |
| 6201777 | Apparatus for discriminating optical recording media of different thicknesses from each other and reproducing information therefrom | Yoichi Tsuchiya, Yasuyuki Kanou, Shuichi Ichiura, Koichi Tada, Masami Shimizu +1 more | 2001-03-13 |
| 6181668 | Optical pickup device and wavelength selective diffraction grating | Yasuyuki Kanou, Masato Yamada, Yoichi Tsuchiya, Shuichi Ichiura | 2001-01-30 |
| 6167019 | Optical Disc cd recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards | Yoichi Tsuchiya, Yasuyuki Kanou, Shuichi Ichiura | 2000-12-26 |
| 6160783 | Optical pick-up device | Yoichi Tsuchiya, Yasuyuki Kanou, Koichi Tada | 2000-12-12 |
| 6137764 | Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards | Yoichi Tsuchiya, Yasuyuki Kanou, Shuichi Ichiura | 2000-10-24 |
| 6122242 | Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards | Yoichi Tsuchiya, Yasuyuki Kanou, Shuichi Ichiura | 2000-09-19 |
| 6108296 | Optical recording disc capable of preventing illegal copy | Youichi Tsuchiya, Kenji Torazawa, Kouichi Tada | 2000-08-22 |
| 6049518 | Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards | Yoichi Tsuchiya, Yasuyuki Kanou, Shuichi Ichiura | 2000-04-11 |
| 6025866 | Superresolution optical pickup apparatus | Yoichi Tsuchiya, Yasuyuki Kanou, Koichi Tada, Katsutoshi Hibino, Shigeki Hori | 2000-02-15 |
| 5917791 | Apparatus for discriminating optical recording media of different thicknesses from each other and reproducing information therefrom | Yoichi Tsuchiya, Yasuyuki Kanou, Shuichi Ichiura, Koichi Tada, Masami Shimizu +1 more | 1999-06-29 |
| 5870371 | Optical pickup device which can be adapted to plurality of types of optical disks | Yoichi Tsuchiya | 1999-02-09 |