Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5258879 | Tracking error detection circuit of magnetic recording and reproduction apparatus for determining tracking error based on pilot signals recorded on a recording meedium | Masafumi Shimotashiro, Kiyokazu Hashimoto, Makoto Gotou, Kei Ichikawa, Kenichi Honjo +2 more | 1993-11-02 |
| 5115422 | Information reproducing apparatus for detecting a reproduced area on a disc | Akihiro Ishikawa, Yoshio Sakakibara | 1992-05-19 |
| 4989196 | Optical information recording apparatus | Akihiro Ishikawa | 1991-01-29 |
| 4785441 | Tracking error correction apparatus utilizing phase difference information derived from four photocells | Shinichi Tanaka, Hiroshi Yasuda, Toshiki Itoi | 1988-11-15 |
| 4740940 | Optical information read apparatus | Shinichi Tanaka, Yuji Tanaka | 1988-04-26 |