Patents by Inventor Tsuyashi Toda

Tsuyashi Toda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for controlling the farm of a magnetic domain of a magneto-optical disk using pre-write testing
    Patent number: 5513165
    Abstract: An optical recording control method determines an optimum recording laser power by effecting a test recording before information to be recorded is recorded on a disk. The recording laser power is formed of a plurality of powers. A relationship among the plurality of laser powers is regulated by power level ratios between respective powers, whereby a power used when a laser light is radiated on the disk can be controlled to be constant independent of an ambient temperature and a structure of a disk. Therefore, accurate recording marks can be formed on the disk.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: April 30, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Ide, Fumiyoshi Kirino, Tsuyashi Toda, Takeshi Maeda, Hiroyuki Tsuchinaga, Fumio Kugiya, Kazuo Shigematsu, Seiichi Mita, Atsushi Saito, Toshimitsu Kaku