Issued Patents All Time
Showing 51–75 of 79 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5365507 | Light-amount control device for an optical-disk recording-reproduction apparatus | Takashi Iwaki | 1994-11-15 |
| 5365505 | Information reproducing device | — | 1994-11-15 |
| 5365501 | Information recording and reproducing device | Takeshi Yamaguchi, Toshihisa Deguchi | 1994-11-15 |
| 5361247 | Information recording and reproducing device with reproduction and automatic gain control circuit | Toshihisa Deguchi, Shigeo Terashima, Takeshi Yamaguchi | 1994-11-01 |
| 5359466 | Magnetic head driving circuit with impedance elements to balance auxiliary coil loads | Mitsuo Ishii | 1994-10-25 |
| 5329408 | Magnetic field modulation magnet-optical recording apparatus in which an FM modulator and a magnetic head driving circuit are used in common | — | 1994-07-12 |
| 5315567 | Optical disk formatting system using index mark detecting circuit | Hirotsugu Matoba | 1994-05-24 |
| 5311493 | Data reproduction circuit for converting a read analog signal | — | 1994-05-10 |
| 5278814 | Apparatus for recording and reproducing information on and from an optical disk | Toshihisa Deguchi, Shigeo Terashima | 1994-01-11 |
| 5210733 | Information recording and reproducing device employing variable data recording clock rates | Takeshi Yamaguchi, Takashi Iwaki, Shigeo Terashima | 1993-05-11 |
| 5166838 | Digital signal reproduction apparatus for reading magneto-optical discs | Takeshi Yamaguchi, Kunio Kojima, Toshihisa Deguchi, Shigeo Terashima, Tsuneo Fujiwara | 1992-11-24 |
| 5134607 | Optical memory system for generating a timing control signal for detecting a recorded region through a playback signal | Shigemi Maeda, Noriaki Sakamoto, Shigeo Terashima, Takeshi Yamaguchi, Kentaro Tsuji +1 more | 1992-07-28 |
| 5107473 | Optical recording/reproducing device using permissible ranges for the value of an automatic gain control voltage | Toshihisa Deguchi | 1992-04-21 |
| 5093820 | Optical disk recording/reproducing device | Shigemi Maeda, Shigeo Terashima, Toshihisa Deguchi | 1992-03-03 |
| 5056076 | Method for controlling the rotational velocity of an information recording disk | Kentaroh Tsuji, Tomiyuki Numata, Tsuneo Fujiwara, Shigeo Terashima | 1991-10-08 |
| 5018120 | Optical recording medium track indexing system | Kentaroh Tsuji, Tsuneo Fujiwara, Shigeo Terashima, Tomiyuki Numata | 1991-05-21 |
| 5010539 | Optical disk device for storing both analog and discrete data and which utilizes both CLV and CAV techniques | Shigeo Terashima, Kentaro Tsuji | 1991-04-23 |
| 5010540 | Apparatus for recording and reproducing information on and from an optical disk | Tsuneo Fujiwara, Takashi Iwaki, Tomiyuki Numata, Kentaroh Tsuji, Shigemi Maeda +4 more | 1991-04-23 |
| 4999824 | Magneto-optical memory device | Shigemi Maeda, Noriaki Sakamoto, Shigeo Terashima, Takeshi Yamaguchi, Kentaro Tsuji +1 more | 1991-03-12 |
| 4993012 | Record face identifying device for magneto-optic record medium | Tomiyuki Numata, Tsuneo Fujiwara, Kentaroh Tsuji | 1991-02-12 |
| 4954903 | Digital signal reproduction apparatus for reading magneto-optical disks | Takeshi Yamaguchi, Kunio Kojima, Toshihisa Deguchi, Shigeo Terashima, Tsuneo Fujiwara | 1990-09-04 |
| 4939710 | Optical magnetic memory device utilizing non-recorded portions of recording medium to represent data | Shigemi Maeda, Takeshi Yamaguchi, Toshihisa Deguchi, Shozou Kobayashi | 1990-07-03 |
| 4935915 | Beam controller for magneto-optical disc memory system | Tetsuo Fujiwara, Takashi Iwaki, Toshihisa Deguchi, Shozou Kobayashi | 1990-06-19 |
| 4924447 | Optical memory device for recording, reproducing or erasing information onto a recording medium, including a recorded region detecting circuit. | Shigemi Maeda, Noriaki Sakamoto, Shigeo Terashima, Takeshi Yamaguchi, Kentaro Tsuji +1 more | 1990-05-08 |
| 4910479 | Automatic gain control device for use in an optical memory device | Shigemi Maeda, Takeshi Yamaguchi, Kunio Kojima, Toshihisa Deguchi, Shigeo Terashima | 1990-03-20 |