Issued Patents All Time
Showing 26–46 of 46 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5479387 | Optical head including multiple photo detectors for reading signals and error signals for servoing from both a read-only recording medium and a magneto-optical recording medium | Nobuhiko Ando, Ryo Ando | 1995-12-26 |
| 5467336 | Magneto-optical recording/reproducing apparatus with optical pickup device having a multi-layer dielectric film beam splitter | Nobuhiko Ando | 1995-11-14 |
| 5453607 | Photodetector for recording/reproducing apparatus for both read only and magneto-optical disk shaped recording medium | Nobuhiko Ando, Ryo Ando | 1995-09-26 |
| 5432766 | Circuit for varying a loop gain of a spindle servo | Ryo Ando | 1995-07-11 |
| 5402397 | Electromagnetic shield device for magneto-optical recording apparatus | Takashi Ohmori, Hajime Yano | 1995-03-28 |
| 5363362 | Apparatus for reproducing recorded data comprising interleaved clusters and cluster linking sectors | Yasuaki Maeda, Ryo Ando, Hideo Obata, Hideki Nagashima, Tadao Yoshida +2 more | 1994-11-08 |
| 5325371 | Coding/decoding apparatus | Yasuaki Maeda | 1994-06-28 |
| 5243588 | Method and apparatus for reading digital data bursts comprising data clusters and cluster linking sectors | Yasuaki Maeda, Ryo Ando, Hideo Obata, Hideki Nagashima, Tadao Yoshida +2 more | 1993-09-07 |
| 5111442 | Recordable optical disc storage device with limited storage capacity, and recording apparatus therefor | Heitaro Nakajima, Masahiro Hotori, Hiroshi Ogawa | 1992-05-05 |
| 5003521 | Optical disk discriminating device | Tadao Yoshida, Ryo Ando | 1991-03-26 |
| 4937802 | Magnetic head drive circuit | Takashi Omori | 1990-06-26 |
| 4932016 | Apparatus and method of recording and reproducing data using a disk | Tadao Yoshida, Ryo Ando | 1990-06-05 |
| 4924455 | Apparatus for generating tracking error signals in a differential phase detection system | Chiaki Nonaka, Tadao Yoshida | 1990-05-08 |
| 4862439 | Recording device that identifies recordable areas of a disk record | Ryo Ando, Tadao Yoshida, Toshio Yoshida | 1989-08-29 |
| 4858217 | Optical disk recording and reproducing device | Tadao Yoshida, Ryo Ando | 1989-08-15 |
| 4687296 | Optical pickup | Yasunori Terayama, Masashi Nakamura, You Yoshitoshi | 1987-08-18 |
| 4613967 | Disc player | Yuichiro Hamada, Masanori Ohtawa, Chiaki Nonaka, Tadao Yoshida, Yoshiaki Haneda | 1986-09-23 |
| 4587644 | Tracking servocontrol circuits for reducing gain to avoid tracking defect in an optical reproducing apparatus | — | 1986-05-06 |
| 4539667 | Disc players | — | 1985-09-03 |
| 4497047 | Optical disc player with focus control during search mode | Chiaki Nonaka | 1985-01-29 |
| 4491882 | Disc players | — | 1985-01-01 |