Patents by Inventor Hiroki Takao

Hiroki Takao 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).

  • Patent number: 6122228
    Abstract: A magneto-optical recording medium comprises, on a substrate, a dielectric layer, a GdFeCo reproducing layer, a non-magnetic layer, and a TbFeCo recording layer. Upon reproduction, a DC magnetic field Hex is applied in the recording direction, and a reproducing light beam is radiated while being modulated to have a low power and a high power in synchronization with a reproducing clock. The reproducing layer is a magnetic film which changes from in-plane magnetization into perpendicular magnetization at a critical temperature Tcr, which has a compensation temperature Tcomp between room temperature and a Curie temperature Tc, and which satisfies Troom<Tcr<Tcomp<Tco<Tc in relation to a Curie temperature Tco of the recording layer.
    Type: Grant
    Filed: August 27, 1998
    Date of Patent: September 19, 2000
    Assignee: Hitachi Maxwell, Ltd.
    Inventors: Katsusuke Shimazaki, Yoshitane Tsuburaya, Norio Ohta, Hitoshi Watanabe, Hiroki Takao