Issued Patents All Time
Showing 76–100 of 106 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5485441 | Method of optically reading information, optical pickup apparatus and optical reproducing apparatus | — | 1996-01-16 |
| 5485452 | Optical information recording medium | — | 1996-01-16 |
| 5457670 | Optical disk information recording apparatus and reproducing apparatus having a plurality of read or write beams | Kiyoshi Tateishi, Hajime Koyanagi | 1995-10-10 |
| 5430704 | Reproducing system for an optical disc | — | 1995-07-04 |
| 5420847 | Reproducing system for an optical disc | Toru Akiyama, Fumitaka Kotaka, Noriaki Murao | 1995-05-30 |
| 5412635 | Optical disk with signal pit recording format, method of recording same and optical pickup | — | 1995-05-02 |
| 5406533 | Information signal recording apparatus | — | 1995-04-11 |
| 5402403 | Device for detecting cross talk level of optically read signal | — | 1995-03-28 |
| 5398228 | Photo-detecting device for reproducing information recorded on an optical disk | — | 1995-03-14 |
| 5379288 | Optical information recording medium and a reproducing apparatus for the recording medium | Noriaki Murao | 1995-01-03 |
| 5355361 | Optical pickup apparatus for reproducing signals recorded on an optical disk | — | 1994-10-11 |
| 5303221 | Optical pickup for an optical disc reproducing system | Noriaki Murao | 1994-04-12 |
| 5289443 | Apparatus for playing optical recording media of different recording densities | Takayuki Nomoto | 1994-02-22 |
| 5283778 | Pickup device | — | 1994-02-01 |
| 5260930 | Optical information recording medium and reproducing apparatus for reproducing information from the medium | — | 1993-11-09 |
| 5233466 | Astigmatism generating device | Susumu Nomura, Eiji Muramatsu | 1993-08-03 |
| 5187697 | Method of reading recorded information from information storage medium with tracks | Eiji Muramatsu | 1993-02-16 |
| 5177729 | Method and apparatus for reading information on information recording medium having track structure | Eiji Muramatsu | 1993-01-05 |
| 5168503 | Harmonic generator | — | 1992-12-01 |
| 5153872 | Information recording device that eliminates cross-talk using inverse components thereof | — | 1992-10-06 |
| 5084858 | Reproducing apparatus having an arithmetic circuit to linearly combine an inverse matrix of crosstalk ratios relative to the adjacent tracks and signals read from the adjacent and traced tracks | — | 1992-01-28 |
| 4926036 | Light detector | — | 1990-05-15 |
| 4920527 | Focusing error detection apparatus | — | 1990-04-24 |
| 4914646 | Optical pickup device having particularly shaped photodetectors for providing an accurate focus error | — | 1990-04-03 |
| 4862446 | Optical focus error control pickup device for an optical recording/reproducing system | — | 1989-08-29 |