Issued Patents All Time
Showing 26–50 of 50 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6414804 | Converging optical system for laser beam source | — | 2002-07-02 |
| 6266302 | Optical disk apparatus | — | 2001-07-24 |
| 6205108 | Optical head for reproducing or recording a compact or similar disk | — | 2001-03-20 |
| 6163513 | Track servo control apparatus for optical disk | — | 2000-12-19 |
| 6081488 | Optical head for recording and playing from optical disc | — | 2000-06-27 |
| 6052343 | Optical head having a shading slit | — | 2000-04-18 |
| 5982732 | Optical head having multiple light sources having different wavelengths | — | 1999-11-09 |
| 5953298 | Focused spot position-discriminating system and optical disk with guiding groove suited therefor | — | 1999-09-14 |
| 5930213 | Spot position-discriminating system and method for discriminating spot position | — | 1999-07-27 |
| 5923635 | Optical information recording or playbacking system, optical head apparatus used in the system and method for recording or playbacking optical information | — | 1999-07-13 |
| 5892749 | Optical head device for reading two optical disks | — | 1999-04-06 |
| 5872759 | Photodetector with regions to detect reflected light pass through central portion and non-central portion of an objective lens | — | 1999-02-16 |
| 5835283 | Condenser lens for optical disks | — | 1998-11-10 |
| 5488600 | Differential optical switch for data multiplexing in an optical fiber loop of an optical information storage apparatus | — | 1996-01-30 |
| 5453963 | Magneto-optical head system for detection of error and information signals by diffraction lights | Ryuichi Katayama | 1995-09-26 |
| 5384728 | Optical information storage apparatus using optical fiber | — | 1995-01-24 |
| 5365540 | Vertical-to-surface optical semiconductor device and apparatus for coupling optical signals | — | 1994-11-15 |
| 5255278 | Semiconductor laser with vertical resonator | — | 1993-10-19 |
| 5181161 | Signal reproducing apparatus for optical recording and reproducing equipment with compensation of crosstalk from nearby tracks and method for the same | Yutaka Hirose, Kazuhiro Okanoue | 1993-01-19 |
| 5121378 | Optical head apparatus for focussing a minute light beam spot on a recording medium | Yutaka Hirose | 1992-06-09 |
| 4960313 | Apparatus for rotating a light image and an optical system for focusing light beams on a recording medium | — | 1990-10-02 |
| 4945529 | Optical head comprising a diffraction grating for directing two or more diffracted beams to optical detectors | Yuzo Ono, Yasuo Kimura | 1990-07-31 |
| 4894815 | Optical head for reading information from a magnetooptic recording medium | — | 1990-01-16 |
| 4817074 | Method and apparatus for detecting the focusing state and positioning accuracy of a light beam directed onto an optical disk tracking guide in an optical recording system | — | 1989-03-28 |
| 4647495 | Electromagnetic reflection body | Tatsuya Kanayama, Hitoshi Toyoda, Akihiko Tanaka, Toshikazu Shinogaya | 1987-03-03 |