Issued Patents All Time
Showing 1–25 of 51 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE40312 | Digital data transmitting method | Tadashi Kojima, Koichi Hirayama, Hisashi Yamada, Yoshiaki Moriyama, Takao Arai +4 more | 2008-05-13 |
| 7190664 | High density optical recording medium and method for reproducing thereof | Takuma Yanagisawa, Takayuki Nomoto, Yasumitsu Wada, Seiichi Ohsawa | 2007-03-13 |
| 6968121 | Video disc having an aspect ratio information and video disc player having an aspect ratio converting function | — | 2005-11-22 |
| 6463210 | Video disc having an aspect ratio information and video disc player having an aspect ratio converting function | — | 2002-10-08 |
| 5987066 | Digital data transmitting method | Tadashi Kojima, Koichi Hirayama, Hisashi Yamada, Yoshiaki Moriyama, Takao Arai +4 more | 1999-11-16 |
| 5917857 | Digital modulation apparatus, a digital modulation method, and a recording medium therefor | Shin-ichi Tanaka, Toshiyuki Shimada, Tadashi Kojima, Koichi Hirayama, Yoshiaki Moriyama +2 more | 1999-06-29 |
| 5914920 | Constant angular velocity type optical disk, double density recording method therefor, and reproducing method for such recorded optical disk | — | 1999-06-22 |
| 5740152 | Spindle servo circuit in an apparatus for playing an optical disk having synchronous marks and data marks satisfying certain criteria | Hideki Hayashi | 1998-04-14 |
| 5646932 | Optical disk, tracking error signal generating apparatus, and tracking control apparatus | Hiroki Kuribayashi | 1997-07-08 |
| 5629924 | Optical disk having synchronous marks and data marks to satisfy certain criteria | Hideki Hayashi | 1997-05-13 |
| 5617406 | Optical disc with heat blocking bands between tracks | Nobuaki Onagi | 1997-04-01 |
| 5608715 | Multi-layered recording disk and recording/reproducing system using the same | Seiichi Ohsawa | 1997-03-04 |
| 5600626 | Optical disk of sampled servo type having synchronization a marks for simple synchronization detection | Yoshimi Tomita, Hideki Hayashi | 1997-02-04 |
| 5583846 | Optical disc and system for generating a tracking error signal for the optical disc | — | 1996-12-10 |
| 5471448 | Tracking servo apparatus for use in an optical disk player | — | 1995-11-28 |
| 5440532 | Digital signal reproducing apparatus for reproducing digital signals from a recording medium | Hideki Hayashi | 1995-08-08 |
| 5434836 | Optical disk, tracking error signal generating apparatus, and tracking control apparatus | Hiroki Kuribayashi | 1995-07-18 |
| 5434840 | Non-linear reflectance optical information recording layer irradiated by a light beam controlled with an amplitude filter | Toshiharu Ezuka | 1995-07-18 |
| 5430700 | Apparatus for playing optical recording medium with combination tracks and plural beams tracking servo | Hiroki Kuribayashi | 1995-07-04 |
| 5376422 | Optical recording medium and apparatus for playing such a medium | Hiroki Kuribayashi | 1994-12-27 |
| 5280462 | Disc playing and recording apparatus having a pair of heads controlled to prevent interruptions during play | — | 1994-01-18 |
| 5246758 | Optical recording medium | Fumio Matsui | 1993-09-21 |
| 5163036 | Duty factor control circuit with variable output pulse width function | — | 1992-11-10 |
| 5124808 | Spindle control device in optical disk recording/reproducing apparatus | — | 1992-06-23 |
| 5121219 | Spindle servo utilizing a vertical sync mark | — | 1992-06-09 |