Patents by Inventor Yousuke Ookubo

Yousuke Ookubo 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).

  • Zoom lens and image pickup apparatus including the same
    Patent number: 8102605
    Abstract: A zoom lens includes first to fourth lens units in order from the object side to the image side. The first, third, and fourth lens units have a positive refractive power. The second lens unit has a negative refractive power. Distances between the lens units are changed during zooming. The first lens unit is composed of a cemented lens including a first lens having a negative refractive power and a second lens having a positive refractive power arranged in order from the object side to the image side. The Nd1a and ?d1a are a refractive index and an Abbe number, respectively, of a material of the first lens for the d-line and are adequately set.
    Type: Grant
    Filed: December 8, 2009
    Date of Patent: January 24, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yousuke Ookubo
  • ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME
    Publication number: 20100149654
    Abstract: A zoom lens includes first to fourth lens units in order from the object side to the image side. The first, third, and fourth lens units have a positive refractive power. The second lens unit has a negative refractive power. Distances between the lens units are changed during zooming. The first lens unit is composed of a cemented lens including a first lens having a negative refractive power and a second lens having a positive refractive power arranged in order from the object side to the image side. The Nd1a and ?d1a are a refractive index and an Abbe number, respectively, of a material of the first lens for the d-line and are adequately set.
    Type: Application
    Filed: December 8, 2009
    Publication date: June 17, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Yousuke Ookubo