Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6184512 | Semiconductor laser apparatus and optical pickup apparatus | Yoshio Hayashi, Tadashi Takeda | 2001-02-06 |
| 6167017 | Optical head assembly having means for detecting tracking errors based on astigmatisms generated by returning beams | Tadashi Takeda | 2000-12-26 |
| 5929907 | Automatic focusing apparatus using scanning line weighting of a video signal to determine an in-focus condition | Masao Yajima | 1999-07-27 |
| 5761174 | Optical pickup device with split hologram element that diffracts light in direction parallel to track | Tadashi Takeda, Yoshio Hayashi, Ikuo Kasuga, Noriyuki Satoh, Hisahiro Ishihara | 1998-06-02 |
| 5357280 | Automatic focusing apparatus using scanning line weighting of a video signal to determine an in-focus condition | Masao Yajima | 1994-10-18 |