Patents by Inventor Kunihiko Horikawa

Kunihiko Horikawa 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).

  • Optical recording medium and a method for reproducing information recorded from same
    Patent number: 5949751
    Abstract: The optical recording medium includes a first layer which is in a state that includes different phases having different optical constants and in which information has been recorded. The second layer is capable of changing states, which states include different phases and different optical constants. There is also provided a method of reproducing information recorded on an optical recording medium which includes a first layer having different phases and different optical constants and a second layer capable of changing states, which states include different phases and different optical constants. The method employs irradiating the second layer with a laser beam, and reproducing information recorded on the first layer from an area corresponding to an area of the second layer where the optical constants change due to laser irradiation.
    Type: Grant
    Filed: September 4, 1996
    Date of Patent: September 7, 1999
    Assignee: Pioneer Electronic Corporation
    Inventors: Kunihiko Horikawa, Eiji Muramatsu