Patents by Inventor Yoshiyasu Nakayama

Yoshiyasu Nakayama 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 writing data on multilayer optical disc and optical disc drive
    Patent number: 8400894
    Abstract: The present invention provides a method for writing data on a multilayer optical disc with N information storage layers (where N is an integer and N?2). The kth deepest one (where k is an integer and 1?k?N) of the storage layers of the multilayer optical disc is called a kth information storage layer.
    Type: Grant
    Filed: September 14, 2010
    Date of Patent: March 19, 2013
    Assignee: Panasonic Corporation
    Inventors: Hiroaki Shigematsu, Harumitsu Miyashita, Yoshiyasu Nakayama
  • METHOD FOR WRITING DATA ON MULTILAYER OPTICAL DISC AND OPTICAL DISC DRIVE
    Publication number: 20120051198
    Abstract: The present invention provides a method for writing data on a multilayer optical disc with N information storage layers (where N is an integer and N?2). The kth deepest one (where k is an integer and 1?k?N) of the storage layers of the multilayer optical disc is called a kth information storage layer.
    Type: Application
    Filed: September 14, 2010
    Publication date: March 1, 2012
    Applicant: PANASONIC CORPORATION
    Inventors: Hiroaki Shigematsu, Harumitsu Miyashita, Yoshiyasu Nakayama
  • Optical information reproduction method and apparatus
    Patent number: 7362667
    Abstract: In an optical information reproduction apparatus having optical beam sources having at least two types of wavelengths, an object lens may be damaged by colliding with an information recording medium while driving a focus servo, which is caused by a fake signal generated due to an incompatibility of the wavelength in use with the information recording medium. To solve such a problem, in case the type of the information recording medium is unrecognizable and a focus servo is led in by using the optical beam source having the first wavelength, the focus servo is led in by using the second focus servo lead-in unit which is driven by an output of a near focus point detection unit during an operation of a second focus search unit which renders the object lens move away from the information recording medium.
    Type: Grant
    Filed: November 12, 2004
    Date of Patent: April 22, 2008
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Emi Kitano, Masayoshi Nakamura, Yoshiyasu Nakayama, Yasuo Ueda
  • Optical information reproduction method and apparatus
    Publication number: 20050105410
    Abstract: In an optical information reproduction apparatus having optical beam sources having at least two types of wavelengths, an object lens may be damaged by colliding with an information recording medium while driving a focus servo, which is caused by a fake signal generated due to an incompatibility of the wavelength in use with the information recording medium. To solve such a problem, in case the type of the information recording medium is unrecognizable and a focus servo is led in by using the optical beam source having the first wavelength, the focus servo is led in by using the second focus servo lead-in unit which is driven by an output of a near focus point detection unit during an operation of a second focus search unit which renders the object lens move away from the information recording medium.
    Type: Application
    Filed: November 12, 2004
    Publication date: May 19, 2005
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Emi Kitano, Masayoshi Makamura, Yoshiyasu Nakayama, Yasuo Ueda