Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6353583 | Signal operational circuit for a multi-beam pick-up device | Ryuuji Kudoh, Masaaki Sofue | 2002-03-05 |
| 6128259 | Optical pickup apparatus for accurate detection of a tracking error signal | Masaaki Sofue, Ryuuji Kudou | 2000-10-03 |
| 5991251 | Method and apparatus for changing laser beam power of an optical storage device for various types of compact disks | Ryuji Kudo, Masaaki Sofue | 1999-11-23 |
| 5341355 | Multibeam optical pickup and servo method thereof | Hiroshi Gotoh, Isamu Shibata, Ikuo Maeda | 1994-08-23 |
| 5105410 | Multi-beam optical pick-up | Ikuo Maeda, Hiroshi Gotoh | 1992-04-14 |
| 4853934 | Semiconductor laser control apparatus | — | 1989-08-01 |