Patents by Inventor Do Hoon Nam

Do Hoon Nam 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 pickup apparatus
    Patent number: 7898922
    Abstract: An optical pickup apparatus includes a first objective lens having a low numerical aperture (NA) suitable for a low-density recording medium, a second objective lens having a high NA suitable for a high-density recording medium, a first light source to generate a short-wavelength optical signal to use the first and second objective lenses, a first photo-detector to receive an optical signal, which is generated from the first light source, is focused on a recording medium by the first and second objective lenses, and is then reflected from the recording medium, and a beam splitter to perform a division of the optical signal generated from the first light source, to direct some parts of the divided optical signal to the first objective lens, and to direct the other parts of the divided optical signal to the second objective lens.
    Type: Grant
    Filed: June 14, 2007
    Date of Patent: March 1, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jang Hoon Yoo, Ichiro Morishita, Soo Han Park, Do Hoon Nam, Ho Jin Yoon, Myoung Seok Kim
  • OPTICAL PICKUP APPARATUS
    Publication number: 20080056102
    Abstract: An optical pickup apparatus includes a first objective lens having a low numerical aperture (NA) suitable for a low-density recording medium, a second objective lens having a high NA suitable for a high-density recording medium, a first light source to generate a short-wavelength optical signal to use the first and second objective lenses, a first photo-detector to receive an optical signal, which is generated from the first light source, is focused on a recording medium by the first and second objective lenses, and is then reflected from the recording medium, and a beam splitter to perform a division of the optical signal generated from the first light source, to direct some parts of the divided optical signal to the first objective lens, and to direct the other parts of the divided optical signal to the second objective lens.
    Type: Application
    Filed: June 14, 2007
    Publication date: March 6, 2008
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Jang Hoon YOO, Ichiro Morishita, Soo Han Park, Do Hoon Nam, Ho Jin Yoon, Myoung Seok Kim