Issued Patents All Time
Showing 1–25 of 25 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12319020 | Method of producing lens molded article | Hiroki Takenaka | 2025-06-03 |
| 11099347 | Lens module for imaging device, and method for producing lens module | Hiroki Takenaka | 2021-08-24 |
| 8693296 | PLL circuit and disk drive | — | 2014-04-08 |
| 8599670 | Viterbi detector and information reproducing apparatus | — | 2013-12-03 |
| 8456977 | Digital PLL circuit, information readout device, disc readout device, and signal processing method | — | 2013-06-04 |
| 8345524 | Information readout apparatus | — | 2013-01-01 |
| 8165007 | Information detection device and optical disc device | — | 2012-04-24 |
| 8085639 | Information reproducing device | — | 2011-12-27 |
| 8027233 | Optical disk device | Tetsuo Ashizawa | 2011-09-27 |
| 8004443 | Information readout apparatus and information reproducing method | — | 2011-08-23 |
| 7978578 | Optical disc device and defect detection method for optical disc medium | Yasuo Ogasawara | 2011-07-12 |
| 7636287 | Reproduced signal equalizing method for optical information media and optical information reproducing/recording apparatus | Shuichi Ohkubo, Masatsugu Ogawa, Masaki Nakano, Toshiaki Iwanaga, Yutaka Kashihara +2 more | 2009-12-22 |
| 7184381 | Optical disk, optical disk recording/reproduction apparatus, and optical disk signal quality evaluation method | Shuichi Ohkubo, Masatsugu Ogawa, Masaki Nakano, Toshiaki Iwanaga, Yutaka Kashihara +1 more | 2007-02-27 |
| 7091895 | A/D converter, digital PLL circuit using the same, and information recording apparatus using the same | — | 2006-08-15 |
| 7072264 | VCO with phase modulated output | Kinji Kayanuma | 2006-07-04 |
| 6928125 | Recording state detection system for use in a disk drive | Masaki Nakano, Masaki Hidano | 2005-08-09 |
| 6788484 | PLL circuit, data detection circuit and disk apparatus | — | 2004-09-07 |
| 6671244 | Information detecting circuit including adaptive equalizer and reproducing apparatus | — | 2003-12-30 |
| 6249553 | Device and method for detecting information | — | 2001-06-19 |
| 6111835 | PRML decoder for processing different channel codes with reduced hardware | — | 2000-08-29 |
| 5991914 | Clock recovery using maximum likelihood sequence estimation | — | 1999-11-23 |
| 5920533 | Clock signal extraction system for high density recording apparatus | — | 1999-07-06 |
| 5917794 | Information detecting device having circuit capable of providing optimum AGC operation | — | 1999-06-29 |
| 5781590 | Partial response maximum likelihood (PRML) signal processing apparatus | Masato Shiokawa | 1998-07-14 |
| 5661713 | Optical information reproducing apparatus with a threshold level generator to eliminate DC level fluctuation | — | 1997-08-26 |