Issued Patents All Time
Showing 1–21 of 21 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11428932 | Lens array and image projection device | Katsuhiro Koike | 2022-08-30 |
| 11256089 | Lens array and image projection device | Katsuhiro Koike | 2022-02-22 |
| 10761323 | Lens array and image projection device | Katsuhiro Koike | 2020-09-01 |
| 9042021 | Optical element, head-up display and light source unit | Ikuya Kikuchi | 2015-05-26 |
| 8422137 | Optical element, head-up display and method for producing optical element | Ikuya Kikuchi | 2013-04-16 |
| 7961574 | Kind identifying apparatus, kind identifying method, and identifying program | — | 2011-06-14 |
| 7440364 | Tracking error signal generation device and tracking error signal generation method | Hiroshi Nishiwaki | 2008-10-21 |
| 7190664 | High density optical recording medium and method for reproducing thereof | Takuma Yanagisawa, Yasumitsu Wada, Fumihiko Yokogawa, Seiichi Ohsawa | 2007-03-13 |
| 6992953 | Tracking servo apparatus of optical information recording and reproducing apparatus | Mitsuru Sato, Junichi Furukawa, Kazuo Takahashi, Takanori Maeda, Hiroshi Nishiwaki +1 more | 2006-01-31 |
| 6937547 | System and method for detecting tracking error | — | 2005-08-30 |
| 6657930 | Tracking control circuit for tracking a wobbling track formed on an optical recording medium | — | 2003-12-02 |
| 6618346 | Optical pickup device having aperture restriction arrangement | Takanori Maeda | 2003-09-09 |
| 6590857 | Optical disk | Akinori Ohkubo, Takuma Yanagisawa | 2003-07-08 |
| 5717682 | Optical disk having information pits of different lengths and shapes | — | 1998-02-10 |
| 5621719 | Optical disk and apparatus for reproducing the same | — | 1997-04-15 |
| 5559787 | Polarization of a reflected light beam is changed according to the depth of pits | — | 1996-09-24 |
| 5539722 | Optical information reproducing system with a reading beam having frequency components of N wavelengths corresponding to four times the N depths to a row of pits | — | 1996-07-23 |
| 5523992 | Optical disk reproducing apparatus for reading a track by irradiating two tracks with single beam spot | — | 1996-06-04 |
| 5359591 | Optical disc having information pits in form of plurality of fragments arranged in symmetrical pattern | — | 1994-10-25 |
| 5357499 | Optical disk and optical disk reproducing apparatus | — | 1994-10-18 |
| 5289443 | Apparatus for playing optical recording media of different recording densities | Takanori Maeda | 1994-02-22 |