Issued Patents All Time
Showing 26–50 of 69 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5668787 | Mark length recording system with trial writing to maximize recording power and error recovery | Yoji Tomono, Atsushi Ichikawa, Toshiyasu Hattori | 1997-09-16 |
| 5642343 | Magnetooptic disc apparatus and recording medium | Tsuyoshi Toda, Seiichi Mita, Toshimitsu Kaku, Takeshi Maeda, Fumiyoshi Kirino +2 more | 1997-06-24 |
| 5590111 | Method of controlling recording of optical records | Fumiyoshi Kirino, Takeshi Maeda, Hiroshi Ide, Toshimitsu Kaku, Seiichi Mita +1 more | 1996-12-31 |
| 5553051 | Increased intensity optical recording medium with adjacent grooves of different optical depth and a method and apparatus for reproducing the same | Hisataka Sugiyama, Takeshi Maeda, Hiroshi Ide, Masaru Ito | 1996-09-03 |
| 5537370 | Magnetooptical-disk recording and/or reproducing apparatus for a 5.25 inch large capacity magnetooptical-disk | Yoji Tomono, Atsushi Ichikawa, Toshiyasu Hattori | 1996-07-16 |
| 5513165 | Method for controlling the farm of a magnetic domain of a magneto-optical disk using pre-write testing | Hiroshi Ide, Fumiyoshi Kirino, Tsuyashi Toda, Takeshi Maeda, Hiroyuki Tsuchinaga +4 more | 1996-04-30 |
| 5457666 | Light modulation method for forming a mark in magneto-optical recording system | Tsuyoshi Toda, Hiroshi Ide, Fumiyoshi Kirino, Takeshi Maeda, Hiroyuki Tsuchinaga +2 more | 1995-10-10 |
| 5446718 | Information recording and reproducing method and system for disc-shaped recording mediums | Kikuo Shimizu | 1995-08-29 |
| 5420832 | Half height magnetooptical-disk recording and/or reproducing apparatus for a 5.25 inch large capacity magnetooptical-disk | Yoji Tomono, Atsushi Ichikawa, Toshiyasu Hattori | 1995-05-30 |
| 5278813 | Optical recording/reproducing apparatus with light beam deflection means including wedge-shaped prism | Kunikazu Ohnishi, Tohru Sasaki, Masayuki Inoue, Michio Miura, Akira Saito | 1994-01-11 |
| 5124967 | Automatic gain control method and apparatus in optical disk system | Kazuo Isaka, Osami Kushizaki, Masahiro Takasago, Takuya Mizokami | 1992-06-23 |
| 5105409 | Method and apparatus for optical recording and reproduction with tracking servo reducing track offset | Toshimitsu Kaku, 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, Toshimitsu Kaku | 1992-01-28 |
| 5077715 | Information recording and reproducing method utilizing particular sector configuration | Takuya Mizokami, Shinichi Arai | 1991-12-31 |
| 5031172 | Unit and disc having a relatively rough surface and method of producing | Jun-ichi Umeda | 1991-07-09 |
| 4949331 | Apparatus and record carrier for optical disc memory with correction pattern and master disc cutting apparatus | Takeshi Maeda, Yoshito Tsunoda, Toshimitsu Kaku | 1990-08-14 |
| 4879703 | Magneto-optic memory apparatus with defect detection of recording medium during erasing operation | Toshimitsu Kaku, Yoshito Tsunoda | 1989-11-07 |
| 4866687 | Optical disc access method and optical disk storage using coarse and fine actuators | Masuo Kasai, Takeshi Maeda, Toshimitsu Kaku, Masahiro Takasago | 1989-09-12 |
| 4835756 | Optical memory apparatus using an optical disc having guide-grooves of V-shape and predetermined optical depth and access method therefor | Toshimitsu Kaku, Takeshi Maeda, Shigeru Nakamura, Masaru Ito, Yoshito Tsunoda | 1989-05-30 |
| 4835759 | Method and apparatus for compensating variation of read data in an optical data storage | Atsushi Saito, Takeshi Maeda, Hisataka Sugiyama, Wasao Takasugi | 1989-05-30 |
| 4819242 | Semiconductor laser driver circuit | Toshimitsu Kaku | 1989-04-04 |
| 4817053 | Apparatus for storing and retrieving information using an electron beam | Tadashi Ikeda, Yasushi Miyauchi, Motoyasu Terao, Tetsuya Nishida, Shinkichi Horigome +2 more | 1989-03-28 |
| 4807210 | Optical information processing apparatus | Toshimitsu Kaku, Yoshito Tsunoda, Takeshi Maeda | 1989-02-21 |
| 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, Norio Ohta +2 more | 1989-02-21 |
| 4788672 | Method and apparatus for controlling renewal of data in optical disc memory | Takashi Toyooka, Norio Ohta, Yutaka Sugita, Atsushi Saito | 1988-11-29 |