Issued Patents 1989
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4879703 | Magneto-optic memory apparatus with defect detection of recording medium during erasing operation | Yoshito Tsunoda, Kazuo Shigematsu | 1989-11-07 |
| 4866687 | Optical disc access method and optical disk storage using coarse and fine actuators | Masuo Kasai, Takeshi Maeda, Kazuo Shigematsu, Masahiro Takasago | 1989-09-12 |
| 4866688 | Composite tracking servo system for optical disc apparatus with track offset correction | Masatoshi Ohtake, Seiji Yonezawa, Toshiaki Tsuyoshi, Kazuo Ichino, Yukio Fukui +2 more | 1989-09-12 |
| 4855991 | Optical disk having track offset detection areas | Yoshito Tsunoda, Takeshi Maeda, Shigeru Nakamura | 1989-08-08 |
| 4835756 | Optical memory apparatus using an optical disc having guide-grooves of V-shape and predetermined optical depth and access method therefor | Takeshi Maeda, Shigeru Nakamura, Masaru Ito, Kazuo Shigematsu, Yoshito Tsunoda | 1989-05-30 |
| 4819242 | Semiconductor laser driver circuit | Kazuo Shigematsu | 1989-04-04 |
| 4806952 | Information recording apparatus for recording/reproducing information by irradiating an information recording medium with an energy beam | Tetsuya Nishida, Motoyasu Terao, Yasushi Miyauchi, Shinkichi Horigome, Kazuo Shigematsu +2 more | 1989-02-21 |
| 4807210 | Optical information processing apparatus | Kazuo Shigematsu, Yoshito Tsunoda, Takeshi Maeda | 1989-02-21 |