Issued Patents All Time
Showing 51–75 of 88 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6218655 | Optical pickup | Masakazu Ogasawara, Sakashi Ohtaki | 2001-04-17 |
| 6198085 | Repeat control apparatus, information reproducing apparatus and information recording apparatus | — | 2001-03-06 |
| 6151154 | Optical pickup, aberration correction unit and astigmatism measurement method | Masakazu Ogasawara, Yoshitsugu Araki, Sakashi Ootaki, Junichi Furukawa | 2000-11-21 |
| 6137754 | Search method for information record medium | Junichi Furukawa, Noriaki Murao | 2000-10-24 |
| 6097777 | Phase locked loop circuit | Kazuo Takahashi | 2000-08-01 |
| 6078556 | System for producing a liquid crystal driving signal | Junichi Furukawa, Noriaki Murao | 2000-06-20 |
| 5999503 | Focus control apparatus in multi-layered disk reading apparatus utilizing acceleration, deceleration and focus error signals to switch between layers of the disk | Masakazu Ogasawara | 1999-12-07 |
| 5963518 | Apparatus for reproducing digital signal | Hideki Kobayashi | 1999-10-05 |
| 5903530 | Apparatus for reproducing record information of multiple-layered optical disc | Kazuo Takahashi | 1999-05-11 |
| 5886496 | Tilt servo controlling apparatus | Junichi Furukawa, Noriaki Murao | 1999-03-23 |
| 5859818 | Tilt servo apparatus for use in optical disc reproducing apparatus | Sakashi Ohtaki, Noriaki Murao | 1999-01-12 |
| 5796691 | Spindle servo system for adjusting rotational speed in optical disk player | Junichi Furukawa | 1998-08-18 |
| 5790613 | Cycle slip detector and phase locked loop circuit and digital signal reproducing apparatus using the same | — | 1998-08-04 |
| 5748045 | Digital PLL circuit | — | 1998-05-05 |
| 5745460 | Disk discriminating method and apparatus | — | 1998-04-28 |
| 5721580 | Laser diode driving apparatus in an optical information recording and reproducing apparatus | Junichi Furukawa | 1998-02-24 |
| 5719847 | Optical disk player having waveform distortion compensating function | Kaoru Yamamoto, Hideki Hayashi, Masaru Umezawa | 1998-02-17 |
| 5717672 | Spindle servo apparatus for optical disk player | Junichi Furukawa | 1998-02-10 |
| 5636197 | Feedback servo for beam power control, tracking control and focus control in an optical disk recording system | — | 1997-06-03 |
| 5572493 | Optical disk information recording apparatus and reproducing apparatus having a plurality of read or write beams | Takanori Maeda, Hajime Koyanagi | 1996-11-05 |
| 5457670 | Optical disk information recording apparatus and reproducing apparatus having a plurality of read or write beams | Takanori Maeda, Hajime Koyanagi | 1995-10-10 |
| 5446713 | Optical pickup drive control apparatus with vibration restraint | — | 1995-08-29 |
| 5420839 | Method of reproducing high-speed audio data by a CD-ROM player | — | 1995-05-30 |
| 5220551 | Spindle control apparatus for disk player | Tsutomu Takahashi | 1993-06-15 |
| 5170386 | Spindle servo circuit for driving a data storage disk having CLV type recording format | — | 1992-12-08 |