Issued Patents All Time
Showing 1–15 of 15 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7782540 | Optical head apparatus and optical information recording and reproduction apparatus | Yasuhiro Tanaka, Michihiro Yamagata, Daisuke Ogata | 2010-08-24 |
| RE40954 | Objective lens and optical head device | Yasuhiro Tanaka, Michihiro Yamagata | 2009-11-10 |
| 7602561 | Optical head apparatus and optical information recording and reproduction apparatus | Yasuhiro Tanaka, Michihiro Yamagata, Daisuke Ogata | 2009-10-13 |
| 7177101 | Optical head apparatus and optical information recording and reproduction apparatus | Yasuhiro Tanaka, Michihiro Yamagata, Daisuke Ogata | 2007-02-13 |
| 7099260 | Objective lens for optical disk | Yasuhiro Tanaka, Michihiro Yamagata | 2006-08-29 |
| 7046350 | Device for calculating diffraction efficiencies of a diffraction lens, lens with grating element, and optical system for reading | Michihiro Yamagata, Kazutake Boku, Yasuhiro Tanaka, Shusuke Ono | 2006-05-16 |
| 6833667 | Organic electroluminescence element and image forming apparatus or portable terminal unit using thereof | Takafumi HAMANO, Hisanori Sugiura, Naohide Wakita, Hiroshi Yamaguchi, Yasuhiro Tanaka | 2004-12-21 |
| 6829209 | OBJECTIVE FOR OPTICAL DISK, OPTICAL HEAD DEVICE AND OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS BOTH COMPRISING THE SAME, MOLD FOR FORMING LENS, METHOD FOR MACHINING MOLD FOR FORMING LENS, AND SHAPE MEASURING INSTRUMENT | Yasuhiro Tanaka, Michihiro Yamagata | 2004-12-07 |
| 6807017 | Objective lens and optical head device | Yasuhiro Tanaka, Michihiro Yamagata | 2004-10-19 |
| 6627869 | Beam shaper, and semiconductor laser source device and optical head using the beam shaper | Yasuhiro Tanaka, Michihiro Yamagata | 2003-09-30 |
| 6606198 | Lens array | Yasuhiro Tanaka, Michihiro Yamagata, Yoshikazu Sano, Tomoko Komatsu, Michiyo Ichikawa +2 more | 2003-08-12 |
| 6590717 | Optical system for optical disk, optical head unit for optical disk, and optical drive device | Yasuhiro Tanaka, Michihiro Yamagata | 2003-07-08 |
| 6504975 | Coupling lens and semiconductor laser module | Michihiro Yamagata, Yasuhiro Tanaka, Hiroyuki Asakura | 2003-01-07 |
| 6490100 | Objective lens and optical head device | Yasuhiro Tanaka, Michihiro Yamagata | 2002-12-03 |
| 6349000 | Device for calculating diffraction efficiencies of a diffraction lens, lens with grating element, and optical system for reading | Michihiro Yamagata, Kazutake Boku, Yasuhiro Tanaka, Shusuke Ono | 2002-02-19 |