Issued Patents All Time
Showing 51–72 of 72 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5757754 | Holographic optical head | Hiroaki Yamamoto, Tetsuo Saimi, Yoshiaki Komma, Hidenori Wada | 1998-05-26 |
| 5748599 | Holographic optical device | Hiroaki Yamamoto, Tetsuo Saimi, Yoshiaki Komma, Hidenori Wada | 1998-05-05 |
| 5737296 | Focus and tracking error detection by using plus and minus first order diffracted light | Yoshiaki Komma, Ken'ichi Kasazumi, Hiroaki Yamamoto | 1998-04-07 |
| 5687153 | Optical head device and optical information apparatus using a lithium niobate hologram with divisional areas to diffract light to corresponding photo detector areas | Yoshiaki Komma, Shin-ichi Kadowaki, Hiroaki Yamamoto, Makoto Kato, Tetsuo Saimi | 1997-11-11 |
| 5648951 | Movable optical head integrally incorporated with objective lens and hologram element | Makoto Kato, Yoshiaki Komma, Shin-ichi Kadowaki, Yoshikazu Hori, Tetsuo Saimi | 1997-07-15 |
| 5644413 | Optical head for adjusting a positional relation between the information medium and the optical head | Yoshiaki Komma, Sadao Mizuno, Makoto Kato, Hidenori Wada | 1997-07-01 |
| 5627812 | Optical head apparatus and diffraction element having at least two diffractive surfaces | Hiroaki Yamamoto | 1997-05-06 |
| 5594713 | Optical pickup head apparatus | Yoshiaki Komma, Makoto Kato, Kaoru Matsuda | 1997-01-14 |
| 5519685 | Optical pickup head apparatus capable of suppressing crosstalk from adjacent tracks and in the recording line density direction | Makoto Kato, Hiroaki Yamamoto, Shin-ichi Kadowaki | 1996-05-21 |
| 5502707 | Diffraction grating and optical pickup apparatus with diffracting grating | Yoshiaki Komma | 1996-03-26 |
| 5495461 | Optical pickup head apparatus | Yoshiaki Komma, Makoto Kato, Kaoru Matsuda | 1996-02-27 |
| 5455712 | Optical element and method of fabricating the same | Hiroaki Yamamoto, Kazuhisa Yamamoto | 1995-10-03 |
| 5412631 | Optical head apparatus for storing, reading or erasing information, and optical information reproducing method and optical information apparatus for optically reading information stored in an optical memory | Yoshiaki Komma, Makoto Kato | 1995-05-02 |
| 5400311 | Hologram and optical apparatus with hologram | Yoshiaki Komma | 1995-03-21 |
| 5367403 | Optical element and method of fabricating the same | Hiroaki Yamamoto, Kazuhisa Yamamoto | 1994-11-22 |
| 5301182 | Optical pickup head | Yoshiaki Komma, Yoshikazu Hori | 1994-04-05 |
| 5296694 | Optical pick-up head apparatus with optical means having polarization anisotropy | Shin-ichi Kadowaki, Yoshiaki Komma, Hiroaki Yamamoto | 1994-03-22 |
| 5293038 | Optical pick-up head apparatus wherein hollographic optical element and photodetector are formed on semiconductor substrate | Shinichi Kadowaki, Yoshiaki Komma | 1994-03-08 |
| 5283771 | Optical pickup head | Shinichi Kadowaki, Yoshiaki Komma | 1994-02-01 |
| 4788561 | Optical recording carrier | Yuzo Takada | 1988-11-29 |
| 4770923 | Protection film structure for functional devices | Kiyotaka Wasa, Takashi Hirao, Atsuo Nishikawa, Takeo Ohta | 1988-09-13 |
| 4586220 | Separable slide fastener | Toyosaku Ogura | 1986-05-06 |