Issued Patents All Time
Showing 1–10 of 10 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5898167 | Optical pick-up head and integrated type optical unit for use in optical pick-up head | Akihiko Yoshizawa, Hiroyuki Imabayashi, Hiroshi Miyajima | 1999-04-27 |
| 5814807 | Optical pick-up head and integrated type optical unit for use in optical pick-up head | Akihiko Yoshizawa, Hiroyuki Imabayashi, Hiroshi Miyajima | 1998-09-29 |
| 5804814 | Optical pick-up head and integrated type optical unit for use in optical pick-up head | Akihiko Yoshizawa, Hiroyuki Imabayashi, Hiroshi Miyajima | 1998-09-08 |
| 5233444 | Focus error detecting apparatus | Takeshi Yamazaki | 1993-08-03 |
| 4544838 | Method and apparatus for detecting tracking error | Kenichi Ito | 1985-10-01 |
| 4479051 | Apparatus for driving objective lens in tracking direction | — | 1984-10-23 |
| 4408313 | Objective lens driving device for tracking and focus corrections | — | 1983-10-04 |
| 4390781 | Method and apparatus for detecting focussing error signal of objective lens | — | 1983-06-28 |
| 4386823 | Objective lens driving device | — | 1983-06-07 |
| 4302830 | Optical information reading-out apparatus | Takashi Hamaoka, Shunpei Tanaka, Kenichi Oinoue | 1981-11-24 |