Patents by Inventor Toyonori Kusuhara

Toyonori Kusuhara 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 device
    Patent number: 8009527
    Abstract: The optical pickup device according to the present invention includes: a light source which emits a first light at a first wavelength, a second light at a second wavelength and a third light at a third wavelength; an optical path combining unit which combines vectors of the first, second and third light emitted by the light source, and matches optical axes of the first light and the third light; a light collection unit which condenses the light from the optical path combining unit into the optical information storage medium; a diffraction element which diffracts reflected light from the optical information storage medium; a first photo detector, a second photo detector and a third photo detector which receives the diffracted light from the first diffraction element; and a prevention unit formed between the first diffraction element and the first photo detector, the second photo detector and the third photo detector, and which prevents irradiation of + first-order diffracted light diffracted by the first diffr
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: August 30, 2011
    Assignee: Panasonic Corporation
    Inventors: Shinichi Hamaguchi, Yuzo Shimizu, Daisuke Furukawa, Naoto Shimada, Toshihiro Kuroda, Toyonori Kusuhara, Hiroaki Yamamoto
  • OPTICAL PICKUP DEVICE
    Publication number: 20080137516
    Abstract: The optical pickup device according to the present invention includes: a light source which emits a first light at a first wavelength, a second light at a second wavelength and a third light at a third wavelength; an optical path combining unit which combines vectors of the first, second and third light emitted by the light source, and matches optical axes of the first light and the third light; a light collection unit which condenses the light from the optical path combining unit into the optical information storage medium; a diffraction element which diffracts reflected light from the optical information storage medium; a first photo detector, a second photo detector and a third photo detector which receives the diffracted light from the first diffraction element; and a prevention unit formed between the first diffraction element and the first photo detector, the second photo detector and the third photo detector, and which prevents irradiation of + first-order diffracted light diffracted by the first diffr
    Type: Application
    Filed: November 16, 2007
    Publication date: June 12, 2008
    Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    Inventors: Shinichi HAMAGUCHI, Yuzo SHIMIZU, Daisuke FURUKAWA, Naoto SHIMADA, Toshihiro KURODA, Toyonori KUSUHARA, Hiroaki YAMAMOTO