Issued Patents All Time
Showing 1–20 of 20 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8437232 | High frequency modulator | Shengyuan Li, Indumini Ranmuthu | 2013-05-07 |
| 8134897 | Current gain control system | Shengyuan Li | 2012-03-13 |
| 8068393 | Optical disc apparatus including a divided photodetector | — | 2011-11-29 |
| 8009546 | Over current protection device | Shengyuan Li | 2011-08-30 |
| 8000200 | HFM enable control system | Shengyuan Li, Lundy Findlay Taylor | 2011-08-16 |
| 7911911 | Optical disk device and control method | — | 2011-03-22 |
| 7706217 | Optical disc apparatus | — | 2010-04-27 |
| 6714500 | Optical disc drive and signal processing method | — | 2004-03-30 |
| 5901125 | Recording and reproducing optical disk device with multi-disk type capability | — | 1999-05-04 |
| 5406536 | Optical disc apparatus having improved read accuracy with non-linear servo signal gain during track access and focus initialization | — | 1995-04-11 |
| 5309425 | Signal processing circuit for optical disk apparatus | Mikio Yamamuro | 1994-05-03 |
| 5306903 | Objective lens position detecting system capable of adjusting amounts of radiation | Mikio Yamamuro | 1994-04-26 |
| 5161144 | System for recording information on an optical recording medium | Ryoji Takeuchi, Tomohisa Yoshimaru | 1992-11-03 |
| 5101396 | Information recording system capable of preventing overwriting | Ryoji Takeuchi | 1992-03-31 |
| 5063548 | Information processing apparatus | Hiroshi Yamashita | 1991-11-05 |
| 4900910 | System for detecting the position of an objective lens | — | 1990-02-13 |
| 4764912 | Optical focusing in magneto-optic disk system | Hideo Ando | 1988-08-16 |
| 4755980 | Optical disk and recording/reproducing device for optical disk | Tomohisa Yoshimaru, Tetsuo Saito | 1988-07-05 |
| 4684797 | Optical system and method for reducing vibration of an objective lens in an optical head assembly of an optical read/write system | Hideo Ando | 1987-08-04 |
| 4641023 | Optical head | Hideo Ando | 1987-02-03 |