Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4475182 | Focus servo control system for automatically adjusting a relative distance between an objective lens unit and a recording surface of an optical recording medium | — | 1984-10-02 |
| 4338682 | Tracking servo system of video disc player | Toru Akiyama | 1982-07-06 |
| 4286147 | In-focus detecting device | Hiroaki Tsuboi | 1981-08-25 |