Issued Patents All Time
Showing 26–40 of 40 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6781771 | Objective lens for optical recording medium and optical pickup device using it | Yu Kitahara | 2004-08-24 |
| 6646817 | Objective lens for optical recording media and optical pickup apparatus using the same | — | 2003-11-11 |
| 6552851 | Achromatic beam shaping prism | — | 2003-04-22 |
| 6545821 | Diffraction type lens and optical pickup apparatus using the same | — | 2003-04-08 |
| 6542314 | Objective lens for optical recording media and optical pickup apparatus using the same | Masato Kawabata | 2003-04-01 |
| 6498689 | Objective lens for optical recording media and optical pickup apparatus using the same | — | 2002-12-24 |
| 6466536 | Objective lens for high-density optical recording medium | — | 2002-10-15 |
| 6166854 | Diffraction type filter having an aberration correction function and wave length selectivity | — | 2000-12-26 |
| 6094308 | Diffraction type filter having a wavelength selectivity | — | 2000-07-25 |
| 6084710 | Diffraction type filter having a wave length selectivity | — | 2000-07-04 |
| 5889749 | Optical pickup apparatus | Katsuo Katagiri, Takayuki Saito | 1999-03-30 |
| 5680256 | Lens for reading out optical recording medium | — | 1997-10-21 |
| 5661607 | Lens for reading out optical recording medium | — | 1997-08-26 |
| 5600493 | Finite conjugate lens system | — | 1997-02-04 |
| 4953958 | Variable magnification duplicator lens system | Nagayoshi Hirano | 1990-09-04 |