Issued Patents All Time
Showing 51–72 of 72 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5270987 | Magneto-optical recording and reproducing method, magneto-optical memory apparatus and magneto-optical recording medium therefor | Shigeru Nakamura, Masahiko Takahashi, Toshio Niihara, Harukazu Miyamoto, Norio Ohta +7 more | 1993-12-14 |
| 5105409 | Method and apparatus for optical recording and reproduction with tracking servo reducing track offset | Kazuo Shigematsu, Hisataka Sugiyama, Takeshi Maeda, Masahiro Takasago | 1992-04-14 |
| 5084860 | Apparatus for optical disc memory with correction pattern and master disc cutting apparatus | Takeshi Maeda, Yoshito Tsunoda, Kazuo Shigematsu | 1992-01-28 |
| 4949331 | Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus | Takeshi Maeda, Yoshito Tsunoda, Kazuo Shigematsu | 1990-08-14 |
| 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 |
| 4751695 | Method and apparatus for tracking servo system | Takeshi Maeda, Kazuo Shigematsu | 1988-06-14 |
| 4742218 | Focus error detection apparatus utilizing focusing an front and rear sides of focal planes | Shigeru Nakamura, Toshimasa Kamisada, Akira Saito, Takeshi Maeda, Yoshito Tsunoda +3 more | 1988-05-03 |
| 4730289 | Magnetic-optical disc memory system and apparatus for switching header and data information | Atsushi Saitoh | 1988-03-08 |
| 4663751 | Optical information processor for compensating offset | Yoshito Tsunoda, Takeshi Maeda, Shigeru Nakamura | 1987-05-05 |
| 4656618 | Optical information recording and reproducing apparatus | Keiji Kataoka, Yoshito Tsunoda, Kazuo Shigematsu | 1987-04-07 |
| 4622564 | Optical information recording apparatus | Takeshi Nakao, Yoshito Tsunoda | 1986-11-11 |
| 4532522 | Optical recording apparatus | Yoshito Tsunoda, Takeshi Maeda, Shigeru Nakamura | 1985-07-30 |
| 4525826 | Optical track position detecting apparatus and optical information processor using the same | Shigeru Nakamura, Yoshito Tsunoda, Kazuo Shigematsu, Takeshi Maeda, Tsuyoshi Kato | 1985-06-25 |
| 4450547 | Focal position detecting optical apparatus | Shigeru Nakamura, Takeshi Maeda, Yoshito Tsunoda, Wasao Takasugi, Tokuya Kaneda | 1984-05-22 |
| 4400707 | Recording medium | Munehisa Mitsuya, Motoyasu Terao, Sakae Ota, Yoshio Taniguchi, Shinkichi Horigome | 1983-08-23 |