Issued Patents All Time
Showing 51–68 of 68 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5257131 | Polarization diffraction element and polarization detector employing the same | Yoshio Yoshida, Takahiro Miyake, Yasuo Nakata | 1993-10-26 |
| 5253237 | Optical head device | Takahiro Miyake, Yoshio Yoshida, Yasuo Nakata, Katsuhiro Kubo | 1993-10-12 |
| 5251280 | Liquid crystal display apparatus | Atsushi Asada, Toshio Ishikawa, Yasuo Nakata, Yoshio Yoshida | 1993-10-05 |
| 5202869 | Optical head device including diffraction grating | Takahiro Miyake, Yoshio Yoshida | 1993-04-13 |
| 5173890 | Optical pickup device including diffraction grating | Takahiro Miyake, Yoshio Yoshida | 1992-12-22 |
| 5128914 | Optical pickup apparatus utilizing a diffraction device | Yoshio Yoshida, Yasuo Nakata, Takahiro Miyake | 1992-07-07 |
| 5111449 | Optical pick-up device using diffraction grating element having two sub-regions | Yoshio Yoshida, Toshiya Nagahama | 1992-05-05 |
| 5085496 | Optical element and optical pickup device comprising it | Yoshio Yoshida, Takahiro Miyake, Yasuo Nakata, Nobuo Ogata, Tetsuo Ueyama +1 more | 1992-02-04 |
| 5049732 | Optical pickup device with diffraction device | Toshiya Nagahama, Yoshio Yoshida, Yasuo Nakata | 1991-09-17 |
| 5050155 | Pick-up device for use in an optical information recording system utilizing a diffraction grating with blaze characteristics | Hideaki Sato, Yasuo Nakata, Nobuo Ogata | 1991-09-17 |
| 5013494 | Process for preparing blazed holograms | Katsuhiro Kubo, Keiji Sakai, Hideyoshi Yamaoka | 1991-05-07 |
| 4998806 | Image reading apparatus | Shigeki Tsuji, Taizo Yokota | 1991-03-12 |
| 4988165 | Object lens driving device | Mitsuo Ishii, Hideyoshi Yamaoka | 1991-01-29 |
| 4985880 | Optical information recording and reproducing apparatus | Yoshio Yoshida, Nobuo Ogata, Mitsuo Ishii, Yasuo Nakata, Takayuki Inoue +1 more | 1991-01-15 |
| 4947261 | Portable image input device | Toshio Ishikawa | 1990-08-07 |
| 4904856 | Optical pickup device with diffraction sensing | Toshiya Nagahama, Yoshio Yoshida | 1990-02-27 |
| 4849825 | Pick-up device for use in an optical information recording system | Hideaki Sato, Yasuo Nakata, Nobuo Ogata, Teruaki Inoue | 1989-07-18 |
| 4812638 | Focusing error detector and optical data detecting device incorporating the focusing error detector | Nobuo Ogata, Yasuo Nakata, Hideaki Satou, Toshiyuki Tanaka, Etsuji Minami +2 more | 1989-03-14 |