Issued Patents All Time
Showing 1–19 of 19 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7643394 | Optical disk, optical disk recording method, and optical disk recording apparatus | Yutaka Kashihara, Hideki Takahashi, Akihito Ogawa, Yutaka Yamanaka, Tatsunori Ide +3 more | 2010-01-05 |
| 7551530 | Optical disc recording system | Naoto Yamamoto, Masatsugu Ogawa | 2009-06-23 |
| 7492697 | Optical disc recording method and apparatus | Tsuyoshi Yamamoto, Katsuki Hattori, Masato Fuma, Yutaka Yamanaka, Tatsunori Ide +3 more | 2009-02-17 |
| 7471617 | Optical disc medium having extended record control data areas, optical disc apparatus using the same, and data recording method on the same | Yutaka Yamanaka, Tatsunori Ide, Hideki Takahashi, Akihito Ogawa, Yutaka Kashihara | 2008-12-30 |
| 7471602 | Recording/reproducing method and recording/reproducing apparatus and optical disk | Akihito Ogawa, Yutaka Kashihara, Hideki Takahashi, Yutaka Yamanaka, Tatsunori Ide | 2008-12-30 |
| 7136339 | Positioning control apparatus and method capable of reducing relative position error without increasing gain and frequency band of transfer characteristics of control system | Masashi Kubota, Naotoshi Iwazawa | 2006-11-14 |
| 5990651 | Stepping motor drive apparatus and stepping motor | Naotoshi Iwazawa | 1999-11-23 |
| 5859817 | Optical disk apparatus and track access control method for optical disk apparatus for reducing the relative position shift between two beam spots which are emitted through two objective lenses | — | 1999-01-12 |
| 5737282 | Optical disk apparatus and track access control method utilizing positioned shift between scanning beams | — | 1998-04-07 |
| 5293364 | Track access control device for an optical disk drive | — | 1994-03-08 |
| 5253238 | Arrangement for producing precise tracking error signal for optical disk device | — | 1993-10-12 |
| 5105399 | Magneto-optical means for reading disks by comparing signals at leading and trailing edges of laser beam | — | 1992-04-14 |
| 5046058 | Track access apparatus having a learning control for positioning a transducer for a disc-shaped recording mechanism | — | 1991-09-03 |
| 5020044 | Head positioning system for use in information recording/reproducing device with means for deriving track crossing signal from tracking error signal | — | 1991-05-28 |
| 4951274 | Magneto-optical head capable of separating beams for reading recorded information and servo information by use of one optical element | Toshiaki Iwanaga, Yoshinori Sasaki | 1990-08-21 |
| 4648085 | Optical information recording and reading apparatus with error correction | — | 1987-03-03 |
| 4615023 | Beam access apparatus for optical disc system | Hiroshi Inada, Tadashi Nomura | 1986-09-30 |
| 4488098 | Position control system for a movable member | — | 1984-12-11 |
| 4216415 | Position control system comprising a digital algebraic adder circuit | Hiroshi Inada | 1980-08-05 |