Issued Patents All Time
Showing 26–50 of 68 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5107472 | Track access and laser beam alignment system for an optical recording and reproduction apparatus | Tsuneo Fujiwara, Masaru Nomura, Kunio Kojima, Takeshi Yamaguchi | 1992-04-21 |
| 5107473 | Optical recording/reproducing device using permissible ranges for the value of an automatic gain control voltage | Hiroshi Fuji | 1992-04-21 |
| 5107486 | Optical memory device with grooves and pits in selected dimensional relationship | Tetsuya Inui, Junji Hirokane, Kenji Ohta | 1992-04-21 |
| 5093820 | Optical disk recording/reproducing device | Shigemi Maeda, Hiroshi Fuji, Shigeo Terashima | 1992-03-03 |
| 5084848 | Feedback control apparatus in an optical recording and reproducing device | Tomiyuki Numata, Masaru Nomura, Kunio Kojima | 1992-01-28 |
| 5081614 | Magneto-optical head utilizing central and peripheral portions of reflected light flux for different purposes | Akira Takahashi, Yoshiteru Murakami, Michinobu Mieda, Kazuo Van, Kenji Ohta +2 more | 1992-01-14 |
| 5048004 | Optical recording medium recording and reproducing device | Takeshi Yamaguchi, Shigemi Maeda, Takashi Iwaki, Tsuneo Fujiwara, Shigeo Terashima | 1991-09-10 |
| 5043959 | Apparatus for developing a magnetic field which maintains a neutral position when the magnetic biasing field is not applied | Hisashi Minami, Shozo Kobayashi, Yoshiki Nishioka | 1991-08-27 |
| 5010540 | Apparatus for recording and reproducing information on and from an optical disk | Hiroshi Fuji, Tsuneo Fujiwara, Takashi Iwaki, Tomiyuki Numata, Kentaroh Tsuji +4 more | 1991-04-23 |
| 5008888 | Semiconductor laser driving apparatus | Tomiyuki Numata, Takashi Iwaki, Kunio Kojima | 1991-04-16 |
| 5005164 | Recording and reproducing apparatus | Noriaki Sakamoto, Shigemi Maeda, Toshihiro Yamanaka, Nobuyuki Horie, Takeshi Yamaguchi +1 more | 1991-04-02 |
| 5001732 | Track counter for optical disk | Masaru Nomura, Hirotsugu Matoba, Shigeo Terashima | 1991-03-19 |
| 4958337 | Disk recording checking method for determining if a disk is defective by the number of errors present | Toshihiro Yamanaka, Nobuyuki Horie, Shozou Kobayashi, Takeshi Yamaguchi, Shigemi Maeda +2 more | 1990-09-18 |
| 4954903 | Digital signal reproduction apparatus for reading magneto-optical disks | Hiroshi Fuji, Takeshi Yamaguchi, Kunio Kojima, Shigeo Terashima, Tsuneo Fujiwara | 1990-09-04 |
| 4939710 | Optical magnetic memory device utilizing non-recorded portions of recording medium to represent data | Hiroshi Fuji, Shigemi Maeda, Takeshi Yamaguchi, Shozou Kobayashi | 1990-07-03 |
| 4935915 | Beam controller for magneto-optical disc memory system | Tetsuo Fujiwara, Hiroshi Fuji, Takashi Iwaki, Shozou Kobayashi | 1990-06-19 |
| 4932013 | Apparatus for reading an optical disk which controls track jumping accurately and stably | Kunio Kojima, Noriaki Sakamoto, Daiji Yamane | 1990-06-05 |
| 4925776 | Optical memory element and manufacturing method thereof | Kenji Ohta, Junji Hirokane, Akira Takahashi, Tetsuya Inui, Shohichi Katoh | 1990-05-15 |
| 4920528 | Method of disk recording using alternative recording tracks | Noriaki Sakamoto, Yoshiki Nishioka, Toshihiro Yamanaka, Nobuyuki Horie, Shozou Kobayashi +1 more | 1990-04-24 |
| 4920437 | Disc clamping device | Junichi Washo, Shigeo Terashima, Masahiro Horii, Takao Hyuga, Kenji Ohta | 1990-04-24 |
| 4910479 | Automatic gain control device for use in an optical memory device | Hiroshi Fuji, Shigemi Maeda, Takeshi Yamaguchi, Kunio Kojima, Shigeo Terashima | 1990-03-20 |
| 4906874 | Analog signal switching device for use in an optical memory | Hiroshi Fuji, Shigemi Maeda, Takeshi Yamaguchi, Kunio Kojima, Shigeo Terashima | 1990-03-06 |
| 4881216 | Optical head in an optical memory device | Yoshikazu Fujii, Tetsuya Inui, Kenji Ohta, Schohichi Katoh | 1989-11-14 |
| 4868922 | Data modulation/demodulation system utilizing demodulation clocks that differ in phase | Kentaro Tsuji, Tsuneo Fujiwara, Shigemi Maeda, Taeshi Yamaguchi, Shozou Kobayashi | 1989-09-19 |
| 4864125 | Extra magnetic field positioning apparatus | Hisashi Minami, Masaru Nomura, Takao Hyuga | 1989-09-05 |