Patents by Inventor Nobuyasu Kikuchi

Nobuyasu Kikuchi 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: 6570828
    Abstract: A skew of an optical pickup device can be adjusted by a movable-side member itself which holds thereon an objective lens. A holder which holds an objective lens is supported by four spring wires such that it can be moved in the focusing direction and the tracking direction of an optical disk. A center of a magnetic circuit which drives the holder is shifted in the outer peripheral side relative to the optical disk. Elastic force of the spring wires of the inner peripheral side is suppressed by increasing the amount of a gel material bonded to the spring wires located on the inner peripheral side of the optical disk as a damping material as compared with the amount of the gel material bonded to the spring wires located on the outer peripheral side.
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: May 27, 2003
    Assignee: Sony Corporation
    Inventors: Nobuyasu Kikuchi, Akio Yamakawa, Yusaku Seki, Tetsuo Maeda, Yutaka Sugawara
  • Publication number: 20020176348
    Abstract: A skew of an optical pickup device can be adjusted by a movable-side member itself which holds thereon an objective lens, A holder which holds an objective lens is supported by four spring wires such that it can be moved in the focusing direction and the tracking direction of an optical disk. A center of a magnetic circuit which drives the holder is shifted in the outer peripheral side relative to the optical disk. Elastic force of the spring wires of the inner peripheral side is suppressed by increasing the amount of a gel material bonded to the spring wires located on the inner peripheral side of the optical disk as a damping material as compared with the amount of the gel material bonded to the spring wires located on the outer peripheral side.
    Type: Application
    Filed: April 27, 2001
    Publication date: November 28, 2002
    Inventors: Nobuyasu Kikuchi, Akio Yamakawa, Yusaku Seki, Tetsuo Maeda, Yutaka Sugawara
  • Patent number: 6104688
    Abstract: An objective lens, a reproducing apparatus and a reproducing method using a single objective lens for a DVD which can also read a CD without adding any peripheral member can be obtained. In an objective lens which is arranged so that a light beam emitted form a common light source (11) may be focused through a common objective lens (8) on respective signal recorded surfaces (1a), (2a) of a DVD (2) and a CD (1) having light transmitting layers (1c), (2c) of different thicknesses, an area of the objective lens (8) for the DVD (2) in a range of a numerical aperture NA from 0 to 0.3-0.4 from the light axis is worked to form correcting lens surface 8a for correcting the aberration caused when reading the CD (1) through the objective lens for the DVD (2), thereby allowing the CD to be read through the objective lens for the DVD.
    Type: Grant
    Filed: February 6, 1998
    Date of Patent: August 15, 2000
    Assignee: Sony Corporation
    Inventors: Nobuyasu Kikuchi, Akio Yamakawa