Issued Patents All Time
Showing 76–87 of 87 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5995472 | Laser beam forming temperature distribution of two peaks on a magneto-optical recording medium | Eiichi Fujii | 1999-11-30 |
| 5671199 | Detecting apparatus for detecting a tracking error signal in an optical information recording and/or reproducing apparatus and an optical information recording and/or reproducing apparatus | — | 1997-09-23 |
| 5657305 | Optical information recording and reproducing apparatus including a total reflection surface or a light shield plate disposed between a polarized light separating surface and a detection device for light beam compensation | Kenichi Sasaki | 1997-08-12 |
| 5586097 | Optical head for generating a plurality of light beams and an opto-magnetic recording/reproducing/erasing apparatus using same | — | 1996-12-17 |
| 5557601 | Optical information recording/reproducing method and apparatus in which a first optical spot performs focusing, tracking, erasing and recording and a second optical spot performs two reproducing modes | — | 1996-09-17 |
| 5521897 | Double beam optical head | — | 1996-05-28 |
| 5463610 | Two-beam optical head for forming first and second light spots on a recording medium | — | 1995-10-31 |
| 5434841 | Plural-beam optical head | — | 1995-07-18 |
| 5406532 | Optical system for a magneto-optical recording/reproducing apparatus | — | 1995-04-11 |
| 5353274 | Beam diameter expansion of a multi-beam optical information system | — | 1994-10-04 |
| 4956833 | Objective driving device for an optical disk apparatus | Hiroshi Kokado, Suguru Takishima, Junichi Takeda, Masahiko Sasaki, Isao Okuda +6 more | 1990-09-11 |
| 4868377 | Optical pickup for reading optical disk information provided with error detecting means by knife edge test | — | 1989-09-19 |