Issued Patents All Time
Showing 26–50 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6219308 | Optical disk system having objective lens with a numerical aperture related to thickness of protective layer | Yoshio Aoki | 2001-04-17 |
| 6169714 | Apparatus and method for recording/reproducing magneto-optical information | Yasuhito Tanaka, Masaaki Kurebayashi, Takeshi Maeda, Hitoshi Watanabe, Shigemi Maeda +3 more | 2001-01-02 |
| 6075762 | Disc drive apparatus | — | 2000-06-13 |
| 6044043 | Magneto-optical head capable of operation under inclination of the disc | Yoshitaka Aoki | 2000-03-28 |
| 5914915 | Magneto-optical disk system having an objective lens with a numerical aperture related to the thickness of the protective layer | Yoshio Aoki | 1999-06-22 |
| 5910932 | Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk | Yoshio Aoki | 1999-06-08 |
| 5838646 | Optical disk having a protective layer of specified thickness relative to the numerical aperture of the objective lens | Yoshio Aoki | 1998-11-17 |
| 5838656 | Optical disk system having an objective lens with a numerical aperture related to the thickness of the protective layer | Yoshio Aoki | 1998-11-17 |
| 5784343 | Magneto-optical recording and/or reproducing apparatus having a plurality of optical systems | Tamotsu Yamagami | 1998-07-21 |
| 5781518 | Disc recording method wherein a segment is recorded with reference data to control the phase of a data clock | Tamotsu Yamagami, Yoichiro Sako | 1998-07-14 |
| 5757733 | Optical disc system having an objective lens with a numerical aperture related to the thickness of the protective layer | Yoshio Aoki | 1998-05-26 |
| 5648944 | Recording/reproducing apparatus that utilizes the servo clock signals to form read and write clock signals with different frequencies | Kiyoshi Ohmori, Katsuhiro Seo, Junichi Kudo | 1997-07-15 |
| 5627810 | Recording/reproducing apparatus that forms read and write clock signals with differing frequencies from the servo clock signals | Kiyoshi Ohmori, Katsuhiro Seo, Junichi Kudo | 1997-05-06 |
| 5617378 | Magneto-optical disc system having an objective lens with a numerical aperture related to the thickness of the protective layer | Yoshio Aoki | 1997-04-01 |
| 5610880 | Optical disc system and optical disk therefor | Yoshio Aoki | 1997-03-11 |
| 5592465 | Disc recording method | Tamotsu Yamagami, Yoichiro Sako | 1997-01-07 |
| 5587990 | Optical disc system and optical disc therefor | Yoshio Aoki | 1996-12-24 |
| 5559774 | Optical disc reproducing apparatus which employs a binary detector for the outer tracks and a ternary detector for the inner tracks | Tamotsu Yamagami, Yoshiyuki Urakawa | 1996-09-24 |
| 5533001 | Magneto-optical disk system with specified thickness for protective layer relative to the numerical aperture of the objective lens | Yoshio Aoki | 1996-07-02 |
| 5515346 | Magneto-optical disk system with specified thickness for protective layer relative to the numerical apperture of the objective lens | Yoshio Aoki | 1996-05-07 |
| 5508981 | Magneto-optical disk system with specified thickness for protective layer relative to the numerical aperture of the objective lens | Yoshio Aoki | 1996-04-16 |
| 5495455 | Magneto-optical disk recording and reading apparatus and method wherein the recording head is controlled in the radial direction of the disk to a desired position | Tetsuji Kawashima | 1996-02-27 |
| 5488590 | Magneto-optical overwrite recording and reproducing system | Tamotsu Yamagami | 1996-01-30 |
| 5428583 | Magneto-optical disc recording/reproducing apparatus | Kiyoshi Ohmori, Katsuhiro Seo, Junichi Kudo | 1995-06-27 |
| 5414687 | Disc recording/reproducing apparatus | Kiyoshi Ohmori, Katsuhiro Seo, Junichi Kudo | 1995-05-09 |